Dissertations / Theses on the topic 'Photography – Digital techniques – Classification'
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Meintjes, Anthony Arthur. ""From digital to darkroom"." Thesis, Rhodes University, 2001. http://hdl.handle.net/10962/d1007418.
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Wolin, Martin Michael. "Digital high school photography curriculum." CSUSB ScholarWorks, 2003. https://scholarworks.lib.csusb.edu/etd-project/2414.
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The purpose of this thesis is to create a high school digital photography curriculum that is relevant to real world application and would enable high school students to enter the work force with marketable skills or go on to post secondary education with advanced knowledge in the field of digital imaging.
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Suen, Tsz-yin Simon, and 孫子彥. "Curvature domain stitching of digital photographs." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B38800901.
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Giloi, Susan Louise. "Effective application of digital printing techniques for fine artists in the South African context." Thesis, Port Elizabeth Technikon, 1999. http://hdl.handle.net/10948/15.
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Carstens, Andries Theunis. "Digitising photographic negatives and prints for preservation." Thesis, Cape Peninsula University of Technology, 2013. http://hdl.handle.net/20.500.11838/1355.
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A DISSERTATION PRESENTED TO THE FACULTY OF INFORMATICS AND DESIGN
OF THE CAPE PENINSULA UNIVERSITY OF TECHNOLOGY IN FULFILMENT OF
THE REQUIREMENTS FOR THE DEGREE OF MAGISTER TECHNOLOGIAE
PHOTOGRAPHY
CAPE PENINSULA UNIVERSITY OF TECHNOLOGY
2013This study deals with the pitfalls and standards associated with the digitisation of photographic artefacts in formal collections. The popularity of the digital medium caused a rapid increase in the demand for converting images into digital files. The need for equipment capable of executing the task successfully, the pressure on collection managers to display their collections to the world and the demand for knowledge needed by managers and operators created pressure to perform optimally and often in great haste. As a result of the rush to create digital image files to be displayed and to be preserved, the decisions that are being made may be questionable. The best choice of file formats for longevity, setting and maintaining standards to guarantee quality digital files and consultation with experts in the field of digitisation as well as attention to best practices are important aspects which must be considered. In order to determine the state of affairs in countries with an advanced knowledge and experience in the field of digitisation, a comprehensive literature study was done. It was found that enough information exists to enable collection managers in South Africa to make well informed decisions to ensure a high quality of digital collection. By means of questionnaires, a survey was undertaken amongst selected Western Cape image preservation institutions to determine the level of knowledge of the managers who are required to make informed decisions. The questionnaire was designed to give insight into choices being made regarding the technical quality, workflow and best practice aspects of digitisation. Comparing the outcome of the questionnaires with best practices and recommended standards in countries with an advanced level of experience it was found that not enough of this experience and knowledge is used by local collection managers although readily available. In some cases standards are disregarded completely. The study also investigated by means of questionnaires the perception of the digital preservation of image files by fulltime photographic students and volunteer members of the Photographic Society of South Africa. It was found that uncertainty exist within both groups with regard to file longevity and access to files in five to ten year's time. Digitisation standards are set and maintained by the use of specially designed targets which enable digitising managers to maintain control over the quality of the digital content as well as monitoring of equipment performance. The use of these targets to set standards were investigated and found to be an accurate and easy method of maintaining control over the standard and quality of digital files. Suppliers of digitising equipment very often market their equipment as being of a high quality and being able to fulfil the required digitisation tasks. Testing selected digitising equipment by means of specially designed targets proved however that potential buyers of equipment in the high cost range should be very cautious about suppliers' claims without proof of performance. Using targets to verify performance should be a routine check before any purchase. The study concludes with recommendations of implementing standards and it points to potential future research.
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Musoke, David. "Digital image processing with the Motorola 56001 digital signal processor." Scholarly Commons, 1992. https://scholarlycommons.pacific.edu/uop_etds/2236.
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This report describes the design and testing of the Image56 system, an IBM-AT based system which consists of an analog video board and a digital board. The former contains all analog and video support circuitry to perform real-time image processing functions. The latter is responsible for performing non real-time, complex image processing tasks using a Motorola DSP56001 digital signal processor. It is supported by eight image data buffers and 512K words of DSP memory (see Appendix A for schematic diagram).
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Santa, Clara Miguel Eduardo. "The application of digital photographic technologies to lighting research." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609406.
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Walton, Shireen Marion. "Camera Iranica : popular digital photography in/of Iran." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:7f6516bf-64c6-4551-b58c-08e42915183f.
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This thesis explores the contemporary genre of popular digital photography, with a specific look at photographs taken in/of Iran. It focuses on the contemporary practice of 'photoblogging' or photography-based weblogging. Photoblogs are the result of the daily posting of digital photographs concerning everyday life in Iran on personal blogs specifically dedicated to photography. The title of the thesis, Camera Iranica, refers to the subject and scope of the study, as well as to its digital-ethnographic field site. I demarcate this as a conceptual and transnational cultural field, encompassing the multitude of places and spaces, on- and offline in which Iranians across the world engage in the practice of producing and viewing popular digital photography. Iranian photoblogs are shown to operate in a manner contingent upon a particular 'visual legacy' of contested cultural identity politics since the Islamic Revolution of 1979, propagated inside Iran and in 'the West'. The thesis traces the social, economic and political implications of developments in photography and digital technologies in Iran in light of this backdrop, and explores how and why Iranians in Iran and abroad are taking up popular digital photography for visual storytelling projects, with 'Iran' as their visual subject. Based on the study's empirical findings, I extrapolate theoretical arguments concerning historical and cultural understandings of digital photographs shown and seen in online environments, and propose innovative methodological strategies for digital-visual anthropologists to continue work in these fields.
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Landry, Brian Michael. "Storytelling for digital photographs supporting the practice, understanding the benefit /." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31805.
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Thesis (Ph.D)--Computing, Georgia Institute of Technology, 2010.Committee Chair: Guzdial, Mark; Committee Member: Abowd, Gregory; Committee Member: Mynatt, Elizabeth; Committee Member: Smith, Michael; Committee Member: Thomas, John. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Huang, Ben. "Removing Textured Artifacts from Digital Photos Using Spatial Frequency Filtering." PDXScholar, 2010. https://pdxscholar.library.pdx.edu/open_access_etds/148.
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An abstract of the thesis of Ben Huang for the Master of Science in Electric and Computer Science presented [August 12nd, 2010]. Title: Removing textured artifacts from digital photos by using spatial frequency filtering Virtually all image processing is now done with digital images. These images, captured with digital cameras, can be readily processed with various types of editing software to serve a multitude of personal and commercial purposes. But not all images are directly captured and even of those that are directly captured many are not of sufficiently high quality. Digital images are also acquired by scanning old paper images. The result is often a digital image of poor quality. Textured artifacts on some old paper pictures were designed to help protect pictures from discoloration. However, after scanning, these textured artifacts exhibit annoying textured noise in the digital image, highly degrading the visual definition of images on electronic screens. This kind of image noise is academically called global periodic noise. It is in a spurious and repetitive pattern that exists consistently throughout the image. There does not appear to be any commercial graphic software with a tool box to directly resolve this global periodic noise. Even Photoshop, considered to be the most powerful and authoritative graphic software, does not have an effective function to reduce textured noise. This thesis addresses this problem by proposing the use of an alternative graphic filter to what is currently available. To achieve the best image quality in photographic editing, spatial frequency domain filtering is utilized instead of spatial domain filtering. In frequency domain images, the consistent periodicity of the textured noise leads to well defined spikes in the frequency transform of the noisy image. When the noise spikes are at a sufficient distance from the image spectrum, they can be removed by reducing their frequency amplitudes. The filtered spectrum may then yield a noise reduced image through inverse frequency transforming. This thesis proposes a method to reduce periodic noise in the spatial frequency domain; summarizes the difference between DFT and DCT, FFT and fast DCT in image processing applications; uses fast DCT as the frequency transform to solve the problem in order to improve both computational load and filtered image quality; and develops software that can be implemented as a plug in for large graphic software to remove textured artifacts from digital images.
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Deng, Hao. "Mathematical approaches to digital color image denoising." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31708.
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Thesis (Ph.D)--Mathematics, Georgia Institute of Technology, 2010.Committee Chair: Haomin Zhou; Committee Member: Luca Dieci; Committee Member: Ronghua Pan; Committee Member: Sung Ha Kang; Committee Member: Yang Wang. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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El-Maleh, Khaled Helmi. "Classification-based techniques for digital coding of speech-plus-noise." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=84239.
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With the increasing demand for wireless voice services and limited bandwidth resources, it is critical to develop and implement coding techniques which use spectrum efficiently. One approach to increasing system capacity is to lower the bit rate of telephone speech. A typical telephone conversation contains approximately 40% speech and 60% silence or background acoustic noise. A reduction of the average coding rate can be achieved by using a Voice Activity Detection (VAD) unit to distinguish speech from silence or background noise. The VAD decision can be used to select different coding modes for speech and noise or to discontinue transmission during speech pauses.The quality of a telephone conversation using a VAD-based coding system depends on three major modules: the speech coder, the noise coder, and the VAD. Existing schemes for reduced-rate coding of background noise produce a signal that sounds different from the noise at the transmitting side. The frequent changes of the noise character between that produced during talk spurts (noise coded along with the speech) and that produced during speech pauses (noise coded at a reduced rate) are noticeable and can be annoying to the user.
The objective of this thesis is to develop techniques that enhance the output quality of variable-rate and discontinuous-transmission speech coding systems operating in noisy acoustic environments during the pauses between speech bursts. We propose novel excitation models for natural-quality reduced-rate coding of background acoustic noise in voice communication systems. A better representation of the excitation signal in a noise-synthesis model is achieved by classifying the type of acoustic environment noise. Class-dependent residual substitution is used at the receive side to synthesize a background noise that sounds similar to the background noise at the transmit side. The improvement in the quality of synthesized noise during speech gaps helps in preserving noise continuity between talk spurts and speech pauses, and enhances the overall perceived quality of a conversation.
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Heiss, Detlef Guntram. "Calibrating the photographic reproduction of colour digital images." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24680.
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Colour images can be formed by the combination of stimuli in three primary colours. As a result, digital colour images are typically represented as a triplet of values, each value corresponding to the stimulus of a primary colour. The precise stimulus that the eye receives as a result of any particular triplet of values depends on the display device or medium used. Photographic film is one such medium for the display of colour images.
This work implements a software system to calibrate the response given to a triplet of values by an arbitrary combination of film recorder and film, in terms of a measurable film property. The implemented system determines the inverse of the film process numerically. It is applied to calibrate the Optronics C-4500 colour film writer of the UBC Laboratory for Computational Vision. Experimental results are described and compared in order to estimate the expected accuracy that can be obtained with this device using commercially available film processing.Science, Faculty of
Computer Science, Department of
Graduate
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Datodi, Mark. "Digital imaging: Creating new realities." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 1999. https://ro.ecu.edu.au/theses/1253.
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More and more it is becoming increasingly difficult to discern photo reality from digital reality. Digital imagery is revolutionising photography and challenging preconceived notions of this art form. Over the years, photography has been viewed metaphorically as a window on the world and on the past. No longer however, is the creation of photographic imagery reliant upon its intrinsic relationship with reality. Using computer technology original photographic material can be altered, manipulated and seamlessly combined with other fictional imagery without obvious detection and with relative ease. The proliferation of digital imaging is producing two apparent crises for photography. The first is the perceived threat to photography, involving the fear that traditional photographic processes, methods and product will be superseded by manipulated digital images passing themselves off as real photographs. Added to these growing concerns for photography's longevity, is the prospect that viewers will no longer believe m photography as a deliverer of objective truth and that the medium itself will lose its power as a 'privileged conveyer of information'(Batchen, 1994,p.47). The second crisis pertains to ethical concerns that these digital simulations raise: copyright, moral rights and artistic integrity.
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Ramakonar, Visalakshi S. "Modulation classification of digital communication signals." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2002. https://ro.ecu.edu.au/theses/752.
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Modulation classification of digital communications signals plays an important role in both military and civilian sectors. It has the potential of replacing several receivers with one universal receiver. An automatic modulation classifier can be defined as a system that automatically identifies the modulation type of the received signal given that the signal exists and its parameters lie in a known range. This thesis addresses the need for a universal modulation classifier capable of classifying a comprehensive list of digital modulation schemes. Two classification approaches are presented: a decision-theoretic (DT) approach and a neural network (NN) approach. First classifiers are introduced that can classify ASK, PSK, and FSK signals. A decision tree is designed for the DT approach and a NN structure is formulated und trained to classify these signals. Both classifiers use the same key features derived from the intercepted signal. These features are based on the instantaneous amplitude, instantaneous phase, and instantaneous frequency of the intercepted signal, and the cumulates of its complex envelope. Threshold values for the DT approach are found from the minimum total error probabilities of the extracted key features at SNR of 20 to -5dB. The NN parameters are found by training the networks on the same data. The DT and NN classifiers are expanded to include CPM signals. Signals within the CPM class are also added to the classifiers and a separate decision tree and new NN structure are found far these signals. New key features to classify these signals are also introduced. The classifiers are then expanded further to include multiple access signals, followed by QAM, PSK8 and FSK8 signals. New features arc found to classify these signals. The final decision tree is able to accommodate a total of fifteen different modulation types. The NN structure is designed in a hierarchical fashion to optimise the classification performance of these fifteen digital modulation schemes. Both DT and NN classifiers are able to classify signals with more than 90% accuracy in the presence of additive white Gaussian within SNR ranging from 20 to 5dB. However, the performance of the NN classifier appears to be more robust as it degrades gradually at the SNRs of 0 and -5dB. At -5dB, the NN has an overall accuracy of 73.58%, whereas the DT classifier achieves only 47.3% accuracy. The overall accuracy of the NN classifier, over the combined SNR range of 20 to -5dB, is 90.7% compared to 84.56% for the DT classifier. Finally, the performances of these classifiers are tested in the presence of Rayleigh fading. The DT and NN classifier structures are modified to accommodate fading and again, new key features are introduced to accomplish this. With the modifications, the overall accuracy of the NN classifier, over the combined SNR range of 20 to -5dB and 120Hz Doppler shift, is 87.34% compared to 80.52% for the DT classifier.
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Làzaro, Angelique Maria. "An informed community's perception of the impact of digital technology on the credibility of news photography." Thesis, Rhodes University, 2000. http://hdl.handle.net/10962/d1002905.
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South African photojournalists’ perception of digital technology’s impact on the credibility of news photographs is investigated in this study. Digital technology has the capabilities to produce “manipulated” photographs that appear realistic and credible. Credibility is dependent on a variety of factors including codes of realism and codes of production, which fit conventional codes of photographic representation. Manipulation is the act of deviating from accepted codes of photographic representation that may jeopardise the credibility of news photography. This thesis proposes a new theoretical framework that encompasses existing theories of semiotics, ideology, naturalism, realism and credibility. These theories underpin the definitions and discussion on manipulation and credibility. A descriptive survey is used which attempts to discover photojournalists’ views towards credibility. This research draws on qualitative research methods using a largely qualitative questionnaire, which generates both qualitative and quantitative data. The questions are formulated around two case studies of digitally manipulated photographs. The trends and responses in the research data are connected and discussed. The findings of this study are discussed in terms of credibility, awareness of the digital changes, the reason for the changes, the role of a caption, deletion techniques and background changes. The empirical situation is analysed in relation to the theoretical discussions and this study’s theorisation of photographic representation.
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Lin, Cong. "Digital shape classification using local and global shape descriptors." Thesis, University of Macau, 2011. http://umaclib3.umac.mo/record=b2492875.
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Deacon, Henry Christopher. "The perspective of Cape Town professional photographers on issues of integrity in the documentary photograph." Thesis, Cape Peninsula University of Technology, 2013. http://hdl.handle.net/20.500.11838/1312.
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Thesis submitted in fulfillment of the requirements for the degree
Magister of Technology: Design
in the Faculty of Informatics and Design
at the Cape Peninsula University of Technology
2013This study investigates the perspective of Capetonian professional photographers on issues of integrity, regarding the impact of digital imaging technology. Key objectives are to establish how the concept of photographic integrity manifests itself throughout the history of the documentary genre, prior and subsequent to the introduction of digital imaging technology; to ascertain the extent to which the Capetonian professional photographer uses digital imaging technology compared to film technology; to discover how Capetonian professional photographers perceive various concepts related to integrity in a documentary photograph; to identify what Capetonian professional photographers regard as acceptable digital editing to the photojournalistic documentary photograph; to ascertain whether Capetonian professional photographers believe that digital imaging technology impacted on the integrity of the documentary photograph; and finally, to discern whether Capetonian professional photographers who have practiced professional photojournalism see the need for a national regulating body, which clearly makes known what acceptable picture taking (in terms of content, e.g. staging of a photograph) and digital editing entails, for the South African photojournalist. The rationale for this study is that we exist in an era where we are faced with a digital revolution which transforms perceptions of integrity and it is essential to ascertain how technology influences the perceptions of the very professionals who produce documentary photography images. The literature review evolves a context for this study. This empirical study’s data collection and analyses has a mixed-method design. The survey’s instrument of data collection is a questionnaire, which captured quantitative data and with half of one question captures qualitative data. I analysed quantitative data with the help of SPSS and I analysed qualitative data much akin to a case study. The statistical test used to analyse quantitative data is a chi-square test and there are 66 participants in the study. I found that a breach of integrity, for instance manipulation, was always possible in the era prior to the introduction of digital imaging technology. Now it is only done faster, more thorough and more people have access to editing technology. Many who lack moral fiber are tempted now, more than ever, to illicitly manipulate. Capetonian professional photographer’s experience in digital image creation and editing technology outweighs the equivalent in the film medium. Digital camera usage takes precedence over film cameras. An example of a perception of a concept related to integrity in documentary photography is the sub-group which has practiced professional photojournalism insisted (73.5% of them strongly agreed) that it is possible to be creative and truthful at the same time in documentary photography. With regard to what acceptable editing entails, for cropping respondents favoured slight cropping; for dodging and burning in respondents favoured very light dodging and burning in; for pasting in respondents favoured no pasting in is acceptable; and for removing of objects respondents favoured no removing of objects. The Capetonian professional photographer believes that digital imaging technology has impacted on the integrity of the documentary photograph. For instance, the study has measured and proved that a majority of Capetonian professional photographers believe that a documentary essay taken in film and processed in the traditional darkroom feels more consistently trustworthy than its digital equivalent. This study has shown that there is a need for a body that clearly makes known what acceptable picture taking and digital editing entails for the professional photojournalistic photographer in South Africa.
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Jorzig, Alexandra. "Liability risks of the use of digital techniques." Universität Leipzig, 2019. https://ul.qucosa.de/id/qucosa%3A33902.
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New technologies not only present new opportunities but also new legal challenges. However, it could be expected that the use of robotics and AI will steadily increase over the next few years. Liability considerations are therefore urgently required.
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Hu, Guang-hua. "Extending the depth of focus using digital image filtering." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45653.
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Two types of image processing methods capable of forming a composite image from a set of image slices which have in-focus as well as out-of-focus segments are discussed. The first type is based on space domain operations and has been discussed in the literature. The second type, to be introduced, is based on the intuitive concept that the spectral energy distribution of a focused object is biased towards lower frequencies after blurring. This approach requires digital image filtering in the spatial frequency domain. A comparison among methods of both types is made using a quantitative uÌ delity criterion.
Master of Science
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Phillips, Carlos. "Photographic transformations and greyscale pictures." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=101163.
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We have introduced a geometry which is invariant to certain forms of burning and dodging photographic prints. We then used this geometry to create invariant measurements which represent information which would not change given different photographic printing processes.The presented algorithm used properties of best-fit planes to represent a photograph. There are many other possibilities for measurements which would fit this framework. Further, the representation of photographs presented in this thesis could be combined with existing computer vision algorithms for such tasks as object recognition within photographs for which we do not know the development process.
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Polignano, Sergio. "Do sensivel a significação : uma poetica da fotografia." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/284754.
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Orientador: Ernesto Giovanni BoccaraDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Artes
Made available in DSpace on 2018-08-07T06:14:51Z (GMT). No. of bitstreams: 1 Polignano_Sergio_M.pdf: 19138121 bytes, checksum: a2a1fa7467459819c2d2f07679e2acbd (MD5) Previous issue date: 2006
Resumo: Este trabalho propõe uma abordagem conceitual, dos diversos conteúdos da imagem fotográfica, a sua leitura e decodificação, que vai da sensibilidade aos significados. Apresenta uma proposta de análise que busca justificar e demonstrar a condição da poética (Arte) da fotografia. Nesse sentido, mostra o que de incomum pode deter o olhar que eterniza e o olhar que ressuscita, dando um real valor às imagens fotográficas, sejam elas quais forem e mostrem o que de mais importante possam mostrar, mantendo as informações ao longo do tempo. Desse modo, busca contribuir para uma melhor compreensão da época em que as fotografias foram feitas, dos cenários que as mesmas registram, de seus contextos, assim como das implicações e relações que tenham com as formas de expressão diferenciadas, que chamamos: Arte
Abstract: This work proposes an conceptual approach to the various contents of photographic image, its interpretation, and decoding, which goes from sensibility to signification; it brings a proposal for an analysis that can effectively justify and demonstrate the condition of poetry (art) of photography, showing which of its uncommon aspects can capture the point of view that makes it eternal and the point of view that resuscitates it, bringing the real value to photographic images, being them whatever they are, showing whatever most important subject they can hold, maintaining their image content throughout time, and serving for a better understanding of the time in which photographs were taken, their scenarios, contexts, implications, and relationships that they have with the different forms of expression that we cal!: Art
Mestrado
Mestre em Artes
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Wang, Yu Long. "Atomic representation for subspace clustering and pattern classification." Thesis, University of Macau, 2017. http://umaclib3.umac.mo/record=b3691898.
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McQuade, Patrick John Art College of Fine Arts UNSW. "Visualising the invisible :articulating the inherent features of the digital image." Awarded by:University of New South Wales. Art, 2007. http://handle.unsw.edu.au/1959.4/43307.
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Contemporary digital imaging practice has largely adopted the visual characteristics of its closest mediatic relative, the analogue photograph, In this regard, new media theorist Lev Manovich observes that "Computer software does not produce such images by default. The paradox of digital visual culture is that although all imaging is becoming computer-based, the dominance of photographic and cinematic imagery is becoming even stronger. But rather than being a direct, "natural" result of photo and film technology, these images are constructed on computers" (Manovich 2001: 179), Manovich articulates the disjuncture between the technical processes involved in the digital image creation process and the visual characteristics of the final digital image with its replication of the visual qualities of the analogue photograph. This research addresses this notion further by exploring the following. What are the defining technical features of these computer-based imaging processes? Could these technical features be used as a basis in developing an alternative aesthetic for the digital image? Why is there a reticence to visually acknowledge these technical features in contemporary digital imaging practice? Are there historic mediated precedents where the inherent technical features of the medium are visually acknowledged in the production of imagery? If these defining technical features of the digital imaging process were visually acknowledged in this image creation process, what would be the outcome? The studio practice component of the research served as a foundation for the author's artistic and aesthetic development where the intent was to investigate and highlight four technical qualities of the digital image identified through the case studies of three digital artists, and other secondary sources, These technical qualities include: the composite RGB colour system of the digital image as it appears on screen; the pixellated microstructure of the digital image; the luminosity of the digital image as it appears on a computer monitor, and the underlying numeric and (ASCII based) alphanumeric codes of the image file which enables that most defining feature of the image file, that of programmability, Based on research in the visualization of these numeric and alphanumeric codes, digital images of bacteria produced through the use of the scanning electron microscope, were chosen as image content for an experimental body of work to draw the conceptual link between these numeric and alphanumeric codes of the image file and the coded genetic sequence of an individual bacterial entity.
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Vila, Duran Marius. "Information theory techniques for multimedia data classification and retrieval." Doctoral thesis, Universitat de Girona, 2015. http://hdl.handle.net/10803/302664.
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We are in the information age where most data is stored in digital format. Thus, the management of digital documents and videos requires the development of efficient techniques for automatic analysis. Among them, capturing the similarity or dissimilarity between different document images or video frames are extremely important.
In this thesis, we first analyze for several image resolutions the behavior of three different families of image-based similarity measures applied to invoice classification. In these three set of measures, the computation of the similarity between two images is based, respectively, on intensity differences, mutual information, and normalized compression distance. As the best results are obtained with mutual information-based measures, we proceed to investigate the application of three different Tsallis-based generalizations of mutual information for different entropic indexes. These three generalizations derive respectively from the Kullback-Leibler distance, the difference between entropy and conditional entropy, and the Jensen-Shannon divergence.
In relation to digital video processing, we propose two different information-theoretic approaches based, respectively, on Tsallis mutual information and Jensen-Tsallis divergence to detect the abrupt shot boundaries of a video sequence and to select the most representative keyframe of each shot.
Finally, Shannon entropy has been commonly used to quantify the image informativeness. The main drawback of this measure is that it does not take into account the spatial distribution of pixels. In this thesis, we analyze four information-theoretic measures that overcome this limitation. Three of them (entropy rate, excess entropy, and erasure entropy) consider the image as a stationary stochastic process, while the fourth (partitional information) is based on an information channel between image regions and histogram binsEns trobem a l’era de la informació on la majoria de les dades s’emmagatzemen en format digital. Per tant, la gestió de documents i vídeos digitals requereix el desenvolupament de tècniques eficients per a l’anàlisi automàtic. Entre elles, la captura de la similitud o dissimilitud entre diferents imatges de documents o fotogrames de vídeo és extremadament important. En aquesta tesi, analitzem, a diverses resolucions d’imatge, el comportament de tres famílies diferents de mesures basades en similitud d’imatges i aplicades a la classificació de factures. En aquests tres conjunt de mesures, el càlcul de la similitud entre dues imatges es basa, respectivament, en les diferències d’intensitat, en la informació mútua, i en la distància de compressió normalitzada. Degut a que els millors resultats s’obtenen amb les mesures basades en la informació mútua, es procedeix a investigar l’aplicació de tres generalitzacions de la informació mútua basades en Tsallis en diferents índexs entròpics. Aquestes tres generalitzacions es deriven respectivament de la distància de Kullback-Leibler, la diferència entre l’entropia i entropia condicional, i la divergència de Jensen-Shannon. En relació al processament de vídeo digital, proposem dos enfocaments diferents de teoria de la informació basats respectivament en la informació mútua de Tsallis i en la divergència de Jensen-Tsallis, per detectar els límits d’un pla cinematogràfic en una seqüència de vídeo i per seleccionar el fotograma clau més representatiu de cada pla. Finalment, l’entropia de Shannon s’ha utilitzat habitualment per quantificar la informativitat d’una imatge. El principal inconvenient d’aquesta mesura és que no té en compte la distribució espacial dels píxels. En aquesta tesi, s’analitzen quatre mesures de teoria de la informació que superen aquesta limitació. Tres d’elles (entropy rate, excess entropy i erasure entropy) consideren la imatge com un procés estocàstic estacionari, mentre que la quarta (partitional information) es basa en un canal d’informació entre les regions d’una imatge i els intervals de l’histograma
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Cass, Taryn May. "A comparison of the views of South African and American photojournalists to the digital manipulation of news photographs." Thesis, Rhodes University, 1999. http://hdl.handle.net/10962/d1002873.
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Digital technology has now become pervasive at most publications in South Africa and in America. Pictures are routinely digitised by publications for ease of handling in the layout process, and this makes it relatively easy to alter or manipulate the pictures using computer software programmes. This thesis attempts to gauge the views of South African photojournalists about the digital manipulation of news photographs, and compare these to the views of American photojournalists. It is based on the hypothesis that South African and American photojournalists have different views of what is acceptable manipulation of news photographs, and that their reasons for this will also be different. This thesis also suggests that the manipulation of news photographs is ethically problematic and can damage the credibility of both the photojournalist and the publication in which the photographs appear. The study involves a comparison of the results from a questionnaire given to South African photojournalists and a similar questionnaire given to American photojournalists. The questionnaires were then supplemented by interviews with six South African photojournalists. The thesis then draws conclusions from the responses to the questionnaires and interviews. These conclusions partially support the initial hypothesis, in that there are some differences between the views of South African and American photojournalists, but, on the whole, these are remarkably similar. Photojournalists do seem to find the manipulation of news photographs to be ethically problematic, but they may find the manipulation of other kinds of images (eg fashion or soft news) to be acceptable. South African photographers also find the manipulation of images by other means (eg different lenses or darkroom techniques) to be more acceptable than Americans do. Although the underlying reasons for these views may differ, maintaining the credibility of the photographer and the publication does seem to be the major issue for avoiding digital manipulation. South African photographers seemed to think that if the photographer had done his or her job well, there would be no need for manipulation, and both groups (but especially the Americans) felt that manipulation could often be equated to lying to the reader, and that this might damage their reputation, and that of their publications.
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Story, Michael Haun. "Comparison of accuracy and efficiency of five digital image classification algorithms." Thesis, This resource online, 1987. http://scholar.lib.vt.edu/theses/available/etd-04122010-083611/.
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Zutautas, Vaidutis. "Charcoal Kiln Detection from LiDAR-derived Digital Elevation Models Combining Morphometric Classification and Image Processing Techniques." Thesis, Högskolan i Gävle, Samhällsbyggnad, GIS, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-24374.
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This paper describes a unique method for the semi-automatic detection of historic charcoal production sites in LiDAR-derived digital elevation models. Intensified iron production in the early 17th century has remarkably influenced ways of how the land in Sweden was managed. Today, the abundance of charcoal kilns embedded in the landscape survives as cultural heritage monuments that testify about the scale forest management for charcoal production has contributed to the uprising iron manufacturing industry. An arbitrary selected study area (54 km2) south west of Gävle city served as an ideal testing ground, which is known to consist of already registered as well as unsurveyed charcoal kiln sites. The proposed approach encompasses combined morphometric classification methods being subjected to analytical image processing, where an image that represents refined terrain morphology was segmented and further followed by Hough Circle transfer function applied in seeking to detect circular shapes that represent charcoal kilns. Sites that have been identified manually and using the proposed method were only verified within an additionally established smaller validation area (6 km2). The resulting outcome accuracy was measured by calculating harmonic mean of precision and recall (F1-Score). Along with indication of previously undiscovered site locations, the proposed method showed relatively high score in recognising already registered sites after post-processing filtering. In spite of required continual fine-tuning, the described method can considerably facilitate mapping and overall management of cultural resources.
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Panta-Gonzaga, Diego-Armando. "“Luces del Alba: proyecto fotográfico que utiliza Instagram como plataforma”." Bachelor's thesis, Universidad de Lima, 2017. http://repositorio.ulima.edu.pe/handle/ulima/5112.
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Moreux, Jean-Philippe, and Guillaume Chiron. "Image Retrieval in Digital Libraries: A Large Scale Multicollection Experimentation of Machine Learning techniques." Sächsische Landesbibliothek - Staats- und Universitätsbibliothek Dresden, 2017. https://slub.qucosa.de/id/qucosa%3A16444.
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While historically digital heritage libraries were first powered in image mode, they quickly took advantage of OCR technology to index printed collections and consequently improve the scope and performance of the information retrieval services offered to users. But the access to iconographic resources has not progressed in the same way, and the latter remain in the shadows: manual incomplete and heterogeneous indexation, data silos by iconographic genre. Today, however, it would be possible to make better use of these resources, especially by exploiting the enormous volumes of OCR produced during the last two decades, and thus valorize these engravings, drawings, photographs, maps, etc. for their own value but also as an attractive entry point into the collections, supporting discovery and serenpidity from document to document and collection to collection. This article presents an ETL (extract-transform-load) approach to this need, that aims to: Identify and extract iconography wherever it may be found, in image collections but also in printed materials (dailies, magazines, monographies); Transform, harmonize and enrich the image descriptive metadata (in particular with machine learning classification tools); Load it all into a web app dedicated to image retrieval. The approach is pragmatically dual, since it involves leveraging existing digital resources and (virtually) on-the-shelf technologies.Si historiquement, les bibliothèques numériques patrimoniales furent d’abord alimentées par des images, elles profitèrent rapidement de la technologie OCR pour indexer les collections imprimées afin d’améliorer périmètre et performance du service de recherche d’information offert aux utilisateurs. Mais l’accès aux ressources iconographiques n’a pas connu les mêmes progrès et ces dernières demeurent dans l’ombre : indexation manuelle lacunaire, hétérogène et non viable à grande échelle ; silos documentaires par genre iconographique ; recherche par le contenu (CBIR, content-based image retrieval) encore peu opérationnelle sur les collections patrimoniales. Aujourd’hui, il serait pourtant possible de mieux valoriser ces ressources, en particulier en exploitant les énormes volumes d’OCR produits durant les deux dernières décennies (tant comme descripteur textuel que pour l’identification automatique des illustrations imprimées). Et ainsi mettre en valeur ces gravures, dessins, photographies, cartes, etc. pour leur valeur propre mais aussi comme point d’entrée dans les collections, en favorisant découverte et rebond de document en document, de collection à collection. Cet article décrit une approche ETL (extract-transform-load) appliquée aux images d’une bibliothèque numérique à vocation encyclopédique : identifier et extraire l’iconographie partout où elle se trouve (dans les collections image mais aussi dans les imprimés : presse, revue, monographie) ; transformer, harmoniser et enrichir ses métadonnées descriptives grâce à des techniques d’apprentissage machine – machine learning – pour la classification et l’indexation automatiques ; charger ces données dans une application web dédiée à la recherche iconographique (ou dans d’autres services de la bibliothèque). Approche qualifiée de pragmatique à double titre, puisqu’il s’agit de valoriser des ressources numériques existantes et de mettre à profit des technologies (quasiment) mâtures.
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Appia, Vikram V. "A color filter array interpolation method for digital cameras using alias cancellation." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22542.
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Thesis (M. S.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2008.Committee Chair: Russell Mersereau; Committee Member: Anthony J. Yezzi; Committee Member: Yucel Altunbasak.
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Garcia, Luciara Bruno [UNESP]. "Barroco paulista: novas possibilidades de documentação." Universidade Estadual Paulista (UNESP), 2015. http://hdl.handle.net/11449/132596.
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000856099.pdf: 23903176 bytes, checksum: 270cac79e67507891207467cad1d754a (MD5)Esta pesquisa trata do trabalho do fotógrafo Germano Graeser, que juntamente com Mário de Andrade e Luiz Saia iniciaram as atividades do Serviço do Patrimô- nio Histórico e Artístico Nacional - SPHAN em São Paulo. Foram levantados, identificados e registrados com documentação fotográfica os patrimônios arquitetônicos do Estado de São Paulo pesquisados pelo Serviço, entre os anos de 1937 - 1966. A pesquisa também propõe uma atualização documental dos registros criados durante aqueles anos, com a utilização da tecnologia da fotografia digital e da técnica da fotografia panorâmica 360 graus, com as quais criaram-se tour virtuais pelos lugares fotografados.
This research is about the work of photographer Germano Graeser who along with Mario de Andrade and Luiz Saia started the activities of the National Historical and Artistic Heritage Service - SPHAN in Sao Paulo. It was collected, identified and recorded with photographic documentation the architectural heritage of the State of Sao Paulo surveyed by SPHAN between the years 1937 - 1966. The research also proposes a documentary update of records created during those years, with the use of photography digital technology and technique of photography panoramic 360 degrees, used to create a virtual tour of the places photographed.
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Garcia, Luciara Bruno 1978. "Barroco paulista : novas possibilidades de documentação /." São Paulo, 2015. http://hdl.handle.net/11449/132596.
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Orientador: Percival Tirapeli.Banca: Pelópidas Cypriano de Oliveira
Banca: Maria Eliza Cezaretti
Resumo: Esta pesquisa trata do trabalho do fotógrafo Germano Graeser, que juntamente com Mário de Andrade e Luiz Saia iniciaram as atividades do Serviço do Patrimô- nio Histórico e Artístico Nacional - SPHAN em São Paulo. Foram levantados, identificados e registrados com documentação fotográfica os patrimônios arquitetônicos do Estado de São Paulo pesquisados pelo Serviço, entre os anos de 1937 - 1966. A pesquisa também propõe uma atualização documental dos registros criados durante aqueles anos, com a utilização da tecnologia da fotografia digital e da técnica da fotografia panorâmica 360 graus, com as quais criaram-se tour virtuais pelos lugares fotografados.
Abstract: This research is about the work of photographer Germano Graeser who along with Mario de Andrade and Luiz Saia started the activities of the National Historical and Artistic Heritage Service - SPHAN in Sao Paulo. It was collected, identified and recorded with photographic documentation the architectural heritage of the State of Sao Paulo surveyed by SPHAN between the years 1937 - 1966. The research also proposes a documentary update of records created during those years, with the use of photography digital technology and technique of photography panoramic 360 degrees, used to create a virtual tour of the places photographed.
Mestre
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Sparrow, Ryan J. "Photographic disconnect : examining the divide between newspaper photographers and designers on the matter of digital alteration of photographs on the front page." Virtual Press, 2008. http://liblink.bsu.edu/uhtbin/catkey/1391238.
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This study explores the differences in attitude held by newspaper photographers and designers concerning the acceptability of digitally altering front-page photographs. It takes its findings from a summer 2006 survey that asked these two newsroom groups to rate their acceptance of certain common techniques used to change photographs from their original forms. Their answers revealed that designers are generally more accepting of altered photographs than their photographer colleagues. Also, photographers are more likely to find acceptable those photographs altered for technical reasons than for aesthetic ones. Least acceptable to photographers, this study finds, are alterations that affect a photograph's content.Department of Journalism
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Gavard, Sandra. "Photo-graft : a critical analysis of image manipulation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0015/MQ54990.pdf.
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Tindale, Adam. "Classification of snare drum sounds using neural networks." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81515.
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The development of computer algorithms for music instrument identification and parameter extraction in digital audio signals is an active research field. A musician can listen to music and instantly identify different instruments and the timbres produced by various playing techniques. Creating software to allow computers to do the same is much more challenging. This thesis will use digital signal processing and machine learning techniques to differentiate snare drum timbres produced by different stroke positions and stroke techniques.
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King-Smith, Leah. "Reading the reading : an exegesis on "traces... vestiges... energies... a relic... landmark... stage: New Farm Powerhouse Project"." Thesis, Queensland University of Technology, 2001.
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As an artist Leah King-Smith has worked for several years in the creative medium of photography exploring notions of multidimensional states of consciousness particularly in reference to the psychic work of Jane Roberts. In this thesis King-Smith presents her creative developments as a technological shift from analogue to digital imaging, and continues, in her Research Project, to follow the same threads of investigation into the use of multi-layering as symbol and expression of simultaneous time. The thesis is two-fold in approach where in the first section, processes, contexts and concepts are presented and in the second section the themes and analysis of the final works are expressed through a creative writing style. The dichotomous method of interpretation in these two sections embodies
the antithetical relationship artists experience between reflexive analysis and creative practice as methods of knowledge.
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Allan, Christopher. "An analysis of digital photojournalistic practices: a study of the Sowetan's photographic department." Thesis, Rhodes University, 2003. http://hdl.handle.net/10962/d1003071.
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Photojournalism in South Africa is in the process of undergoing a shift from an analogue past to a fully digital future. This shift to digital has already been completed by many of the newspapers in the United States of America and Europe, and the new technology is seen to have made fundamental differences in the way that journalists do their job. This thesis attempts to explore the differences brought about, as well as the problems experienced by the photographic department at the Sowetan newspaper as a result of the shift to digital. How the development of technology has affected the photojournalist throughout is focused upon in a brief history of photojournalism and examples of how technology has shaped different aspects of journalism in both a positive and negative manner is considered. Exactly what digital photography is, how it has been integrated into American Photographic departments and the changes that the new technology has prompted are also explained. The manipulation of images in the past as well as the relative ease of digital manipulation are covered and concerns are raised about the future implications of digital manipulation. By conductlng participant observation and holding interviews, research data was compiled which allowed conclusions to be drawn about the impact that the shift to digital had had on the Sowetan photographic department. Intentional and unintentional consequences were expected and revealed in the research. The job of the photojournalist and photographic editor was found to have changed but perhaps not as dramatically as expected. Third world factors such as crime, poverty and lack of education were discovered to have resulted in problems that differed noticeably from those experienced by American and European photographic departments. Some expected difficulties were not experienced at all, while other major obstacles, specifically the repairs that must constantly be made to the digital cameras, continue to hamper the operations of the new digital department. Some understanding of the problems that might be encountered by future photojournalism departments that are considering making the shift to digital are arrived at, in the hope that they may be foreseen and overcome.
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Czarske, Jürgen W., Daniel Haufe, Nektarios Koukourakis, and Lars Büttner. "Perspectives of multimode fibers and digital holography for optogenetics." SPIE, 2016. https://tud.qucosa.de/id/qucosa%3A34836.
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Optogenetic approaches allow the activation or inhibition of genetically prescribed populations of neurons by light. In principle, optogenetics offers not only the ability to elucidate the functions of neural circuitry, but also new approaches to a treatment of neurodegenerative diseases and recovery of vision and auditory perception. Optogenetics already has revolutionized research in neuroscience. However, new methods for delivering light to three-dimensionally distributed structures e.g. in the brain are necessary. A major hurdle for focusing light through biological tissue is the occurring scattering and scrambling of the light. We demonstrate the correction of the scrambling in a multimode fiber by digital optical phase conjugation with a perspective for ptogenetics.
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Chioino-Salomón, Nadir-Milagros. "La construcción y reconstrucción de identidades virtuales mediante el uso de selfies en las redes sociales." Bachelor's thesis, Universidad de Lima, 2016. http://repositorio.ulima.edu.pe/handle/ulima/2963.
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Tiene como objetivo principal analizar las diversas estrategias implementadas por los usuarios al momento de producir y compartir selfies en las redes sociales y a su vez, comprender cómo los selfies contribuyen a la construcción y reconstrucción de sus identidades virtuales. Buscamos categorizar también los motivos fundamentales por las cuales los individuos incurren en estas prácticas, además de documentar la evolución de las tecnologías de la información y su repercusión en los usuarios.Tesis
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Newton, Ian Paul. "Recent transformations in West-Coast Renosterveld: patterns, processes and ecological significance." Thesis, University of the Western Cape, 2008. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_8396_1263521893.
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This
thesis
examines
the
changes
that
have
occurred
within
West-Coast Renosterveld within
the
last 350 years, and assesses
the viability of
the
remaining fragments.
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Pedroso, Anderson Antonio. "Vilém flusser : de la philosophie de la photographie à l’univers des images techniques." Thesis, Sorbonne université, 2020. http://www.theses.fr/2020SORUL103.
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La pensée de Vilém Flusser (1920-1991) a donné lieu à une abondante bibliographie critique sur ses apports en matière de communication, où son pari d’une « nouvelle imagination » fait tenir ensemble l’art, la science et la technologie, sous l’égide de sa philosophie de la photographie. L’archéologie de sa pensée, proposée ici, a été construite en tenant compte de l’ancrage disciplinaire de ses travaux dans les théories de la communication et des médias : elle s’est intéressée à la notion de l’art que Flusser développe au cours de son parcours, afin de saisir le déploiement de cette dimension artistique, son statut et ses contours, aussi bien que sa portée. La notion d’art chez Flusser est indissociablement liée à l’histoire : l’expérience traumatisante de l’exil est devenue centrale dans sa pensée critique de tout totalitarisme. L’ensemble de pratiques et de savoirs qui fondent son rapport au monde et qui informent sur l’élaboration de sa pensée sont travaillés par une Kulturgeschichte, vue depuis la perspective d’une « post-histoire ». Mais il y a en particulier une pensée du jeu, ludique, où l’objectif est moins de jouer à l’intérieur des règles établies que de déjouer les règles, de « jouer pour changer le jeu ». Autrement dit, il s’agit d’une pensée radicalement dialogique et polyphonique, dont la Kommunikologie, façonnée comme métathéorie, représente l’essor de Flusser. Sa trajectoire historique et les savoirs qui lui sont associés contribuent à la construction d’une pensée cybernétique qui projette les lignes fondamentales d’une Kunstwissenschaft, dans laquelle il propose une sorte d’iconoclasme sans renoncer aux imagesThe thought of Vilém Flusser (1920-1991) has given rise to an abundant critical bibliography on his contributions in the field of communication, where his wager on a "new imagination" brings together art, science and technology, under the aegis of his philosophy of photography. The archaeology of his thought, proposed here, is constructed alongside this disciplinary underpinning of his work in the theories of communication and media: it involves the notion of art that Flusser developed during his career, in order to grasp the deployment of this artistic dimension, its status and its contours, in his thought. Flusser's notion of art is inseparably linked to history: the traumatic experience of exile becames central in his critical thinking regarding all totalitarianism. The practices and knowledge that underpin his relationship to the world and guide the development of his conception are worked on by a Kulturgeschichte, seen from the perspective of a "post-history". But there is, in particular, a playful thinking of the game, where the objective is less to play within the established rules than to thwart the rules, to "play to change the game". In other words, it is a radically dialogical and polyphonic way of thinking, whose Kommunikologie, shaped as metatheory, directs the development of Flusser's work. His historical trajectory and the knowledge associated with it contribute to the construction of a cybernetic way of thinking that sketches the fundamental lines of a Kunstwissenschaft, in which he proposes a kind of iconoclasm without giving up images
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Neilan, Judith A. "Desktop publishing and photo manipulation : a survey of Indiana high school publications advisors." Virtual Press, 1999. http://liblink.bsu.edu/uhtbin/catkey/1137674.
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Majd, Farjam. "Two new parallel processors for real time classification of 3-D moving objects and quad tree generation." PDXScholar, 1985. https://pdxscholar.library.pdx.edu/open_access_etds/3421.
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Two related image processing problems are addressed in this thesis. First, the problem of identification of 3-D objects in real time is explored. An algorithm to solve this problem and a hardware system for parallel implementation of this algorithm are proposed. The classification scheme is based on the "Invariant Numerical Shape Modeling" (INSM) algorithm originally developed for 2-D pattern recognition such as alphanumeric characters. This algorithm is then extended to 3-D and is used for general 3-D object identification. The hardware system is an SIMD parallel processor, designed in bit slice fashion for expandability. It consists of a library of images coded according to the 3-D INSM algorithm and the SIMD classifier which compares the code of the unknown image to the library codes in a single clock pulse to establish its identity. The output of this system consists of three signals: U, for unique identification; M, for multiple identification; and N, for non-identification of the object.
Second, the problem of real time image compaction is addressed. The quad tree data structure is described. Based on this structure, a parallel processor with a tree architecture is developed which is independent of the data entry process, i.e., data may be entered pixel by pixel or all at once. The hardware consists of a tree processor containing a tree generator and three separate memory arrays, a data transfer processor, and a main memory unit. The tree generator generates the quad tree of the input image in tabular form, using the memory arrays in the tree processor for storage of the table. This table can hold one picture frame at a given time. Hence, for processing multiple picture frames the data transfer processor is used to transfer their respective quad trees from the tree processor memory to the main memory. An algorithm is developed to facilitate the determination of the connections in the circuit.
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Cardoso, Silvia Helena dos Santos. "Estrada, paisagem e capim - = fotografias e relatos no Jalapão." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/284439.
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Orientador: Luise WeissA biblioteca do IA acompanha 2 DVD-R
Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Artes
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Resumo: Estrada, Paisagem e Capim - Fotografias e Relatos no Jalapão é uma pesquisa em Poética Visual constituída por viagens - como deslocamento e experiência estética - ao cerrado jalapoeiro, no interior do Estado do Tocantins. A fotografia digital e as anotações se constituem como expressão e desenvolvimento do percurso processual do trabalho realizado. As referências teóricas e visuais contaram com a Antropologia como essência, metodologia e inserção no campo de pesquisa e a Arte como espaço de reflexão e criação para o caminho poético. Diferentes questionamentos surgiram ao longo do desenvolvimento do fazer artístico e acabaram por delimitar o trabalho. Nesta pesquisa, arte, natureza e cultura tornam-se pares no processo de registro e percepção da intuição criativa fotográfica, enfatizando assim, o caráter de "work in progress". Um Livro de Fotografias e um DVD sonorizado com 170 imagens são apresentados como processo e resultado do trabalho poético
Abstract: Road, Landscape and Grass - Photographs and Reports in the Jalapão is a research in Poetic Visual consisting of travels - such as displacement and aesthetic experience - to the brazilian savannah, in the State of Tocantins/BR. The digital photography and the written summary notes are as expression and development of the proceedings of the visual work done. The theoretical and visual references counted with the Anthropology as well as essence, methodology and insertion in the field of research, and the Art to be a space for reflection and creation for the poetic way. Different questions have arisen in the course of the development of artistic making and ultimately define the work. In this research, art, nature and culture have become parts in the process of registration and perception of the creative intuition photographic, emphasizing the character of "work in progress". A book of photographs and a DVD with sound and 170 images are presented as a process and outcome of the research poetic
Doutorado
Artes Visuais
Doutor em Artes
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Zadeh, Saman Akbar. "Application of advanced algorithms and statistical techniques for weed-plant discrimination." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2020. https://ro.ecu.edu.au/theses/2352.
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Precision agriculture requires automated systems for weed detection as weeds compete with the crop for water, nutrients, and light. The purpose of this study is to investigate the use of machine learning methods to classify weeds/crops in agriculture. Statistical methods, support vector machines, convolutional neural networks (CNNs) are introduced, investigated and optimized as classifiers to provide high accuracy at high vehicular speed for weed detection.
Initially, Support Vector Machine (SVM) algorithms are developed for weed-crop discrimination and their accuracies are compared with a conventional data-aggregation method based on the evaluation of discrete Normalised Difference Vegetation Indices (NDVIs) at two different wavelengths. The results of this work show that the discrimination performance of the Gaussian kernel SVM algorithm, with either raw reflected intensities or NDVI values being used as inputs, provides better discrimination accuracy than the conventional discrete NDVI-based aggregation algorithm.
Then, we investigate a fast statistical method for CNN parameter optimization, which can be applied in many CNN applications and provides more explainable results. This study specifically applies Taguchi based experimental designs for network optimization in a basic network, a simplified inception network and a simplified Resnet network, and conducts a comparison analysis to assess their respective performance and then to select the hyper parameters and networks that facilitate faster training and provide better accuracy. Results show that, for all investigated CNN architectures, there is a measurable improvement in accuracy in comparison with un-optimized CNNs, and that the Inception network yields the highest improvement (~ 6%) in accuracy compared to simple CNN (~ 5%) and Resnet CNN counterparts (~ 2%).
Aimed at achieving weed-crop classification in real-time at high speeds, while maintaining high accuracy, the algorithms are uploaded on both a small embedded NVIDIA Jetson TX1 board for real-time precision agricultural applications, and a larger high throughput GeForce GTX 1080Ti board for aerial crop analysis applications. Experimental results show that for a simplified CNN algorithm implemented on a Jetson TX1 board, an improvement in detection speed of thirty times (60 km/hr) can be achieved by using spectral reflectance data rather than imaging data. Furthermore, with an Inception algorithm implemented on a GeForce GTX 1080Ti board for aerial weed detection, an improvement in detection speed of 11 times (~2300 km/hr) can be achieved, while maintaining an adequate detection accuracy above 80%. These high speeds are attained by reducing the data size, choosing spectral components with high information contents at lower resolution, pre-processing efficiently, optimizing the deep learning networks through the use of simplified faster networks for feature detection and classification, and optimizing computational power with available power and embedded resources, to identify the best fit hardware platforms.
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El-Hajjaji, Abdellah. "Traitement numérique en 3D d'un couple d'images stéréo du satellite SPOT." Rouen, 1993. http://www.theses.fr/1993ROUES028.
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L'objectif de notre recherche est d'extraire les altitudes h d'une scène donnée prise en image sous deux angles différents donnés par le satellite SPOT. Dans ce but nous avons modélisé le mouvement du satellite et de son système optique afin de transformer les deux images initiales en images épipolaires, ce qui nous permettra de réduire le temps d'appariement et de trouver les pixels homologues avec succès. Pour la mise en correspondance, nous avons utilisé une technique qui est à base de la corrélation et de la programmation dynamique. Cette méthode nous a permet d'apparier 96 % des pixels homologues avec une erreur inférieure à 5 mètres. Ce problème de mise en correspondance reste toujours ouvertThe aim of our research was to extract the level h of a precise landscape taken over two differents angles by the satellite SPOT. To do so, we have modelised the movement of the satellite and his optical system to transform the two first images in another one, epipolar which will allow us to reduce the matching time and to find with success the equivalent pixels. For the pairing, we have utilised a technic wich is based on the corrolation and of the dynamic programming. This method was very satisfactory and allow us to match 96 % of the equivalent pixels, with an error of less than 5 meters, but the original problem is still a matter of research for complimentary studing
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Fugita, Romário Keiti Pizzatto. "Prior de regularização para problema de demosaicing com aplicação em CFA’s variados." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1841.
Full textAbstract:
CNPqEste trabalho tem por objetivo apresentar uma nova proposta aos algoritmos de Demosaicing existentes, utilizando uma abordagem mais flexível quanto ao uso do Color filter array (CFA) em imagens coloridas de único sensor. O algoritmo proposto tem como base a estrutura de problemas inversos, cujo funcionamento utiliza um modelo de operação matriz-vetor que é adaptável ao CFA empregado. A partir deste conceito, o algoritmo trata o problema de Demosaicing como o de minimização de função custo, com um termo referente à dependência da estimativa com os dados obtidos e com o modelo de captura, o outro termo é relacionado aos conhecimentos observados em imagens que podem ser explorados para uma estimativa mais precisa, tal elemento é chamado de Prior. A proposta estabelecida tem como base algoritmos de regularização com foco na alta correlação presente entre os canais de cor (R, G e B), e na suavidade local de regiões uniformes, essa base formaliza o Prior empregado no trabalho. A minimização da proposta é atingida iterativamente através do IRLS-CG, que é a combinação de dois algoritmos de minimização eficientes, que apresenta rápidas respostas, e a capacidade de trabalhar com a norma L1 em conjunto com a norma L2. Com o intuito de atestar a qualidade do algoritmo proposto, foi elaborado um experimento em que o mesmo foi testado com diferentes CFAs e em situação com ruído gaussiano de 35dB e sem ruído algum em imagens da base de dados da Kodak, e os resultados comparados com algoritmos do estado-da-arte, no qual o desempenho da proposta apresentou resultados excelentes, inclusive em CFAs que destoam do padrão Bayer, que é o mais comumente usado na atualidade.
This research presents a new proposal to Demosaicing algorithms, using a more flexible approach to deal with the Color filter array (CFA) in single sensor color imaging. The proposed algorithm is structured in the inverse problems model, whose functions employ a CFA adaptive matrix-vector operational model. From this concept, the Demosaicing problem is treated as a cost function minimization with two terms, one referring to the dependence between the estimation and the data provided by the acquisition model, and other term related to features observed in images, which can be explored to form a more precise estimation, this last term is known as Prior. The established proposal is applied in regularization algorithms with focus on the high correlation among color channels (R, G, and B), and in the local smoothness of uniform regions. Both characteristics organize the Prior employed in this work. The minimization proposed is iteratively achieved through IRLS-CG, which is the combination of two efficient minimization algorithms, that presents quick responses, and the capacity to deal with L1 and L2 norm at the same time. The quality of the proposed algorithm is verified in an experiment in which varous CFA were used and a situation with 35dB gaussian noise and another one with no noise applied to the Kodak dataset, and the results were compared with state-of-the-art algorithms, in which the performance of the proposed Prior showed excellent results, including when the CFA is different from Bayer’s, which is the most commonly used pattern.
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Wachs, Marina-Elena. "Zeichnen als Weltentwurf: Analog + Digital: Die Bedeutung des Zeichnens in der Primarausbildung mit Blick auf Design Engineering in Europa." Thelem Universitätsverlag & Buchhandlung GmbH & Co. KG, 2021. https://tud.qucosa.de/id/qucosa%3A75930.
Full textAbstract:
„Sketching the world“ bedeutet entwerfen von Welt mittels analogen und digitalen Zeichenmitteln - auch in Zukunft benötigt es dafür im Design Engineering der Künstlichen Intelligenz (KI) und der Emotionalen Intelligenz (EQ – nach Daniel Goleman). Zeichnen ist Kulturgut seit der Steinzeit und ist für die kulturelle Bildung als auch für das Design Engineering der Zukunft von großer Bedeutung. Zeichnen-Erfahrungen, sei es mit dem Stock im Sand oder mit dem Stift auf Papier, beginnt in der Primarbildung: Bereits hier ist es als Kulturtechnik essentiell für die Gesellschaft, indem der aktive Akt des Zeichnens Selbstausdruck und kulturelles Gedächtnis, Signifikat ist. Zeichnen ist individuelles und kollektives Wissens- und Bildungsmanagement für die Welt von morgen und muss in der Primabildung früh – multidisziplinär – verankert sein, soll es im Skizzieren, im Mapping, als Repräsentation und Projektion wirkungsvoll für das Design Engineering in Europa, auch in der Augmented Reality, eingesetzt werden.
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Nyström, Josefina. "Multivariate non-invasive measurements of skin disorders." Doctoral thesis, Umeå University, Chemistry, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-865.
Full textAbstract:
The present thesis proposes new methods for obtaining objective and accurate diagnoses in modern healthcare. Non-invasive techniques have been used to examine or diagnose three different medical conditions, namely neuropathy among diabetics, radiotherapy induced erythema (skin redness) among breast cancer patients and diagnoses of cutaneous malignant melanoma. The techniques used were Near-InfraRed spectroscopy (NIR), Multi Frequency Bio Impedance Analysis of whole body (MFBIA-body), Laser Doppler Imaging (LDI) and Digital Colour Photography (DCP).
The neuropathy for diabetics was studied in papers I and II. The first study was performed on diabetics and control subjects of both genders. A separation was seen between males and females and therefore the data had to be divided in order to obtain good models. NIR spectroscopy was shown to be a viable technique for measuring neuropathy once the division according to gender was made. The second study on diabetics, where MFBIA-body was added to the analysis, was performed on males exclusively. Principal component analysis showed that healthy reference subjects tend to separate from diabetics. Also, diabetics with severe neuropathy separate from persons less affected.
The preliminary study presented in paper III was performed on breast cancer patients in order to investigate if NIR, LDI and DCP were able to detect radiotherapy induced erythema. The promising results in the preliminary study motivated a new and larger study. This study, presented in papers IV and V, intended to investigate the measurement techniques further but also to examine the effect that two different skin lotions, Essex and Aloe vera have on the development of erythema. The Wilcoxon signed rank sum test showed that DCP and NIR could detect erythema, which is developed during one week of radiation treatment. LDI was able to detect erythema developed during two weeks of treatment. None of the techniques could detect any differences between the two lotions regarding the development of erythema.
The use of NIR to diagnose cutaneous malignant melanoma is presented as unpublished results in this thesis. This study gave promising but inconclusive results. NIR could be of interest for future development of instrumentation for diagnosis of skin cancer.