Dissertations / Theses: 'Source image'

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Feideropoulou, Georgia. "Codage Conjoint Source-Canal des Sources Vidéo." Phd thesis, Télécom ParisTech, 2005. http://pastel.archives-ouvertes.fr/pastel-00001294.

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L'objet de cette thèse est de proposer un codage conjoint source-canal de séquences vidéo pour la transmission sur des canaux sans fil. Le système de codage conjoint source-canal est fondée sur un quantificateur vectoriel structuré et une assignation linéaire d'étiquette qui minimisent simultanément la distorsion canal et la distorsion source. Le quantificateur vectoriel qui est construit à partir de constellations provenant de réseaux de points, lesquels satisfont la propriété de diversité maximale, minimise la distorsion source d'une source gaussienne. La distorsion canal est également minimisée par l'étiquetage linéaire. Nous avons étudié les dépendances entre les coefficients d'ondelettes provenant d'une décomposition t+2D, avec ou sans estimation de mouvement afin d'étendre le schéma du codage conjoint source-canal, développé pour les sources gaussiennes, dans le domaine vidéo où la distribution des coefficients est loin d'être gaussienne. Nous proposons un modèle doublement stochastique afin de capturer ces dépendances et nous l'appliquons à la protection des erreurs pour prédire les coefficients perdus et améliorer ainsi la qualité de vidéo. Dans le cas d'un canal gaussien, nous développons deux systèmes, un avec un étiquetage linéaire non codé et l'autre avec un étiquetage linéaire codé utilisant des codes de Reed-Muller. Nous comparons ces deux schémas de codage avec un schéma non-structuré dont l'étiquetage est adapté au canal et avec un coder vidéo scalable. Dans le cas d'un canal de Rayleigh non-sélectif à évanouissements indépendants le schéma devient robuste lorsque nous utilisons une matrice de rotation avant la transmission sur le canal.

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van, der Gracht Joseph. "Partially coherent image enhancement by source modification." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/13379.

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Livadas, Gerassimos Michail. "Composite source models in image signal interpolation." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47156.

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Solano, Solano David. "Image quality analysis in dual-source CT." [S.l. : s.n.], 2008. http://nbn-resolving.de/urn:nbn:de:bsz:16-opus-89891.

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Subbalakshmi, K. P. "Joint source-channel decoding of variable-length encoded sources with applications to image transmission." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0013/NQ61684.pdf.

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Shajahan, Sunoj. "Agricultural Field Applications of Digital Image Processing Using an Open Source ImageJ Platform." Diss., North Dakota State University, 2019. https://hdl.handle.net/10365/29711.

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Digital image processing is one of the potential technologies used in precision agriculture to gather information, such as seed emergence, plant health, and phenology from the digital images. Despite its potential, the rate of adoption is slow due to limited accessibility, unsuitability to specific issues, unaffordability, and high technical knowledge requirement from the clientele. Therefore, the development of open source image processing applications that are task-specific, easy-to-use, requiring fewer inputs, and rich with features will be beneficial to the users/farmers for adoption. The Fiji software, an open source free image processing ImageJ platform, was used in this application development study. A collection of four different agricultural field applications were selected to address the existing issues and develop image processing tools by applying novel approaches and simple mathematical principles. First, an automated application, using a digital image and “pixel-march” method, performed multiple radial measurements of sunflower floral components. At least 32 measurements for ray florets and eight for the disc were required statistically for accurate dimensions. Second, the color calibration of digital images addressed the light intensity variations of images using standard calibration chart and derived color calibration matrix from selected color patches. Calibration using just three-color patches: red, green, and blue was sufficient to obtain images of uniform intensity. Third, plant stand count and their spatial distribution from UAS images were determined with an accuracy of ≈96 %, through pixel-profile identification method and plant cluster segmentation. Fourth, the soybean phenological stages from the PhenoCam time-lapse imagery were analyzed and they matched with the manual visual observation. The green leaf index produced the minimum variations from its smoothed curve. The time of image capture and PhenoCam distances had significant effects on the vegetation indices analyzed. A simplified approach using kymograph was developed, which was quick and efficient for phenological observations. Based on the study, these tools can be equally applied to other scenarios, or new user-coded, user-friendly, image processing tools can be developed to address specific requirements. In conclusion, these successful results demonstrated the suitability and possibility of task-specific, open source, digital image processing tools development for agricultural field applications.
United States. Agricultural Research Service
National Institute of Food and Agriculture (U.S.)

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Soobhany, Ahmad Ryad. "Image source identification and characterisation for forensic analysis." Thesis, Keele University, 2013. http://eprints.keele.ac.uk/2301/.

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Digital imaging devices, such as digital cameras or mobile phones, are prevalent in society. The images created by these devices can be used in the commission of crime. Source device identification is an emerging research area and involves the identification of artefacts that are left behind in an image by the camera pipeline. These artefacts can be used as digital signatures to identify the source device forensically. The type of digital signature considered in this thesis is the Sensor Pattern Noise (SPN), which consists mainly of the PRNU (Photo Response Non-Uniformity) of the imaging device. The PRNU is unique to each individual sensor, which can be extracted traditionally with a wavelet denoising filter and enhanced to attenuate unwanted artefacts. This thesis proposes a novel method to extract the PRNU of a digital image by using Singular Value Decomposition (SVD) to extract the digital signature. The extraction of the PRNU is performed using the homomorphic filtering technique, where the inherently nonlinear PRNU is transformed into an additive noise. The range of the energy of the PRNU is estimated, which makes it easier to separate from other polluting components to obtain a cleaner signature, as compared to extracting all the high frequency signals from an image. The image is decomposed by using SVD, which separates the image into ranks of descending order of energies. The estimated energy range of the PRNU is used to obtain the interesting ranks that are utilised to form part of the digital signature. A case study of an existing image analyser platform was performed by investigating its identification and classification results. The SVD based extraction method was tested by extracting image signatures from camera phones. The results of the experiments show that it is possible to determine the source device of digital images.

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Aitken, David M. "The fallacy of single source fire support." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FAitken.pdf.

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Andersson, Tomas. "On error-robust source coding with image coding applications." Licentiate thesis, Stockholm : Department of Signals, Sensors and Systems, Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4046.

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Biggar, M. J. "Source coding of segmented digital image and video signals." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/38235.

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Kohler, Rachel. "Supporting Open Source Investigative Journalism with Crowdsourced Image Geolocation." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/78697.

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Journalists rely on image and video verification to support their investigations and often utilize open source tools to verify user generated content, but current practice requires experts be involved in every step of the process. Additionally, lacking custom tools to support verification efforts, experts are often limited to the utility of existing, openly available tools, which may or may not support the interactions and information gathering they require. We aim to support the process of geolocating images and videos through crowdsourcing. By enabling crowd workers to participate in the geolocation process, we can provide investigative journalists with efficient and complete verification of image locations. Parallelizing searching speeds up the verification process as well as provides a more extensive search, all while allowing the expert to follow up on other leads or investigative work. We produced a software prototype called GroundTruth which enables crowd workers to support investigative journalists in the geolocation of visual media quickly and accurately. Additionally, this work contributes experimental results demonstrating how the crowd can be utilized to support complex sensemaking tasks.
Master of Science

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Wu, Zhenyu. "Joint source/channel coding for image and video transmission." Diss., The University of Arizona, 2005. http://hdl.handle.net/10150/282900.

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With the rapid growth of data communication infrastructure, there has been an increasing demand for multimedia communication services over the past years. This rapid growth has posed new requirements and challenges in many related research areas. This dissertation studies the problem of efficient and robust transmission of image and video contents over noisy channels. Firstly, joint source/channel coding algorithms are proposed for image transmission based on the new image coding standard JPEG2000. By combining the forward error correction capability provided by channel coding, together with the scalability and error resilience (ER) features provided by JPEG2000, the algorithm can achieve unequal error protection gains as well as robust source decoding for single image transmission over band-limited channels. Secondly, joint source/channel coding algorithms for multiple sources transmission over a common channel sharing a given total bandwidth are proposed. The algorithms exploit the rate-distortion diversity among multiple sources to optimally distribute a total bit rate given by the channel. It is demonstrated that both improved quality and reduced quality variance can be achieved at the receiver by the proposed algorithms. Finally, a robust image transmission scheme is proposed for packet erasure channels. The algorithm is based on the ER functionalities provided by JPEG2000 for robust source decoding. Together with the proposed interleaving scheme, some erasures can be recovered without channel coding.

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Khan, Sheraz. "MEG Source Imaging and Dynamic Characterization." Phd thesis, Ecole Polytechnique X, 2010. http://pastel.archives-ouvertes.fr/pastel-00583104.

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This work focuses on two complementary aspects of magnetic source imaging using Magnetoencephalography: 1. Imaging of neural current sources from MEG surface recordings. 2. Dynamic characterization of neural current patterns at the surface of the cortex. MEG Source Imaging Accurate estimation of the local spatial extent of neural current activity is very important for the quantitative analysis of neural current sources, as estimated from Magnetoencephalography (MEG) surface recordings. In association with the excellent time resolution offered by MEG, this would represent a major advancement in non invasive, time-resolved functional brain imaging. We address this issue through a new method called Multipole Cortical Remapping (MCR) to accurately specify the spatial extent of neural current sources. In MCR, the zero-order Tikhonov regularized image of the current distribution on the cortex is rst estimated from MEG surface data for which we sought for a realistic model of neural generators. Then the resulting functional image is thresholded using a simple histogram-based principle. This thresholded image is then decomposed into groups of activation patterns following an automatic labeling algorithm based on the geometrical properties of the cortical surface. The equivalent multipolar decomposition of each current patch is then obtained. By default, the multipolar moments are not readily related to the actual anatomical support of the actual neural currents detected using MEG. Hence we introduce an image remapping techniques of the multipolar parameters back onto the original cortical manifold in a Bayesian framework that includes physiological and anatomical priors. MEG Source Dynamic Characterization For dynamic characterization of neural current patterns at the surface of the cortex, we used modied Helmholtz Hodge Decomposition (HHD) which is applied on motion eld of neural current sources. This motion eld is also known as optical ow. Optical ow is the apparent motion due to variations in the pattern of brightness and, under specic conditions, may mimic the velocity eld of an object. Normally, the optical ow is obtained in a two-dimensional domain, which may prevent access to some essential features of the object's motion with respect to the topology or geometry of the domain onto which it is evolving. A new variational method to represent optical ow on non at surfaces using Riemannian formulation was recently introduced by our group to overcome this issue. We broaden this framework and introduce a new formalism to detect features in the resulting optical ow model using a modied and extend framework to the HHD on 2-Riemannian manifolds, which we use to characterize neural current sources. HHD is a technique used to decompose a two-dimensional (resp. threedimensional) continuous vector eld into the sum of 3 distinct components: 1. a non-rotational element, deriving from the gradient of a scalar potential U; 2. a non-diverging component, deriving from the rotational of a scalar potential A (resp. vectorial potential); 3. a harmonic vectorial part, i.e., whose Laplacian vanishes The HHD approach enables the decomposition and tracking of time-resolved neural current ows as obtained from MEG source imaging as sources and sinks, e.g., by detecting relative maxima of the non-rotational scalar potential. It also extends the analysis of brain activity in terms of tracking travelling objects onto the cortical manifold by detecting vectors of largest amplitudes in zero Laplacian harmonic vector elds. We also apply HHD in structural and functional brain imaging applications. The results are very encouraging. We believe that HHD has an enormous potential and it can decipher many riddles in neuroscience. The methods discussed in HHD portion of the thesis are implemented in Matlab as plug-in to the Brainstorm (MEG/EEG data processing software) and can be downloaded from: http://neuroimage.usc.edu/brainstorm

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McClelland, Scott C. "A rolling line source for a seismic sonar." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Jun%5FMcClelland.pdf.

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Cavallini, Alessandro Giorgio. "Lean Six Sigma as a Source of Competitive Advantage." Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2656.pdf.

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MacLean, Douglas J. "Mobile source development for seismic-sonar based landmine detection." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FMacLean.pdf.

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Katayama, Masaaki, Akira Ogawa, Satoshi Makido, Takaya Yamazato, and Hiraku Okada. "A Design of Source Matched Map Receiver for Image Transmission." IEEE, 2001. http://hdl.handle.net/2237/7765.

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Nalavolu, Praveen Reddy. "PERFORMANCE ANALYSIS OF SRCP IMAGE BASED SOUND SOURCE DETECTION ALGORITHMS." UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_theses/50.

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Steered Response Power based algorithms are widely used for finding sound source location using microphone array systems. SRCP-PHAT is one such algorithm that has a robust performance under noisy and reverberant conditions. The algorithm creates a likelihood function over the field of view. This thesis employs image processing methods on SRCP-PHAT images, to exploit the difference in power levels and pixel patterns to discriminate between sound source and background pixels. Hough Transform based ellipse detection is used to identify the sound source locations by finding the centers of elliptical edge pixel regions typical of source patterns. Monte Carlo simulations of an eight microphone perimeter array with single and multiple sound sources are used to simulate the test environment and area under receiver operating characteristic (ROCA) curve is used to analyze the algorithm performance. Performance was compared to a simpler algorithm involving Canny edge detection and image averaging and an algorithms based simply on the magnitude of local maxima in the SRCP image. Analysis shows that Canny edge detection based method performed better in the presence of coherent noise sources.

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Dodgson, Terence E. "Source coded image data in the presence of channel errors." Thesis, Aston University, 1986. http://publications.aston.ac.uk/8051/.

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The growth and advances made in computer technology have led to the present interest in picture processing techniques. When considering image data compression the tendency is towards trans-form source coding of the image data. This method of source coding has reached a stage where very high reductions in the number of bits representing the data can be made while still preserving image fidelity. The point has thus been reached where channel errors need to be considered, as these will be inherent in any image comnunication system. The thesis first describes general source coding of images with the emphasis almost totally on transform coding. The transform technique adopted is the Discrete Cosine Transform (DCT) which becomes common to both transform coders. Hereafter the techniques of source coding differ substantially i.e. one technique involves zonal coding, the other involves threshold coding. Having outlined the theory and methods of implementation of the two source coders, their performances are then assessed first in the absence, and then in the presence, of channel errors. These tests provide a foundation on which to base methods of protection against channel errors. Six different protection schemes are then proposed. Results obtained, from each particular, combined, source and channel error protection scheme, which are described in full are then presented. Comparisons are made between each scheme and indicate the best one to use given a particular channel error rate.

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Denison, Michael Hunter. "Image Source Modeling of Time Reversal for Room Acoustics Applications." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/7449.

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Time Reversal (TR) is a technique that may be used to focus an acoustic signal at a particular point in space. While many variables contribute to the quality of TR focusing of sound in a particular room, the most important have been shown to be the number of sound sources, signal bandwidth and absorption properties of the medium [Ribay et al., J. Acoust. Soc. Am. 117(5), 2866-2872 (2005)]. However, the effect of room size on TR focusing has not been explored. Using the image source method algorithm proposed by Allen and Berkley [J. Allen and D. A. Berkley, J. Acoust. Soc. Am. 65(4), 943-950 (1979)], TR focusing was simulated in a variety of rooms with different absorption and volume properties. Experiments are also conducted in a couple rooms to verify the simulations. The maximum focal amplitude, the temporal focus quality, and the spatial focus clarity are defined and calculated for each simulation. The results are used to determine the effects of absorption and room volume on TR. Less absorption increases the amplitude of the focusing and spatial clarity while decreasing temporal quality. Dissimilarly, larger volumes decrease focal amplitude and spatial clarity while increasing temporal quality. This thesis also explores the placement of individual transducers within a room. It also compares the layout of several source transducers used for a reciprocal time reversal process. Maximum focal amplitude and spatial clarity are found to increase when the focus location is dual coplanar to the source location while temporal quality is found to decrease in comparison to the case when source and focal location share only one plane. Maximum focal amplitude is found to be at a minimum when the focus location is at the critical distance and increases closer and farther away from the source, while temporal quality steadily decreases and spatial clarity steadily increases farther from the source. The maximum focal amplitude and the temporal quality are not greatly affected by the type of array layout, but a circular array is ideal for maximizing spatial clarity.

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Lingwall, Jeff W. "Bayesian and Positive Matrix Factorization approaches to pollution source apportionment /." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1295.pdf.

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Hamilton, Shana Lyris. "The Enduring Mythological Role of the Anonymous Source Deep Throat." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1563.pdf.

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Siripala, Seksit. "An open-source and Java-technologies approach to Web applications." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03sep%5FSiripala.pdf.

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Thesis (M.S. in Computer Science)--Naval Postgraduate School, September 2003.
Thesis advisor(s): Neil C. Rowe, Gary L. Kreeger. Includes bibliographical references (p. 121-122). Also available online.

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Leong, Wai Yie. "Implementing blind source separation in signal processing and telecommunications /." [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19158.pdf.

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Hemmert, Karl S. "Source Level Debugging of Circuits Synthesized from High Level Language Descriptions." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd405.pdf.

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Håkonsen, Greg Harald. "Joint Source-Channel Coding for Image Transmission over Flat Fading Channels." Doctoral thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1695.

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In this thesis, transmission of images over a at fading channel using joint source-channel coding (JSCC) is considered. Through the use of nonlinear dimensional changing mappings, the system becomes robust. The system will not experience a clear breakdown, but have a graceful degradation which is visually pleasant. It is shown how multiple ways of adapting the source to the channel, and using the knowledge about the channel, results in a performance comparable to state-of-the-art systems but with less complexity. By relying on the robustness, reduction in channel information does not mean a large loss in performance.

The proposed system has low computational complexity as there are no separate source and channel coders. Compression and generation of channel symbols are done in one operation. By using nonlinear dimensional changing mappings, the dependency between the channel symbols are low. This leads to a system where the received image can be progressively decoded, and where the received information is still usable if the transmission stops unexpectedly.

By allowing a small variation around target time and transmission power constraints, the variation of the quality of the received image is kept small. This is done through planning and on-the-fly adaptation of the transmission. The planning depends on the distribution of the channel quality, and makes sure the channel is used bandwidth efficiently.

Through the results, the impact and importance of the design of some of the system parameters are analyzed and discussed.

By using theoretical models, it is shown how practical limitations of the system contributes to loss in performance. Similar techniques are also used to analyze where in the system effort should be made to improve the system.

The proposed system has a framework that can be easily extended to other scenarios.

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Cheng, Ho-yiu, and 鄭浩堯. "Laser source, image processing and fast imaging technology for opticalcoherence tomography." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B44519011.

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Skepetzis, Vasilios, and Pontus Hedman. "The Effect of Beautification Filters on Image Recognition : "Are filtered social media images viable Open Source Intelligence?"." Thesis, Högskolan i Halmstad, Akademin för informationsteknologi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-44799.

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In light of the emergence of social media, and its abundance of facial imagery, facial recognition finds itself useful from an Open Source Intelligence standpoint. Images uploaded on social media are likely to be filtered, which can destroy or modify biometric features. This study looks at the recognition effort of identifying individuals based on their facial image after filters have been applied to the image. The social media image filters studied occlude parts of the nose and eyes, with a particular interest in filters occluding the eye region. Our proposed method uses a Residual Neural Network Model to extract features from images, with recognition of individuals based on distance measures, based on the extracted features. Classification of individuals is also further done by the use of a Linear Support Vector Machine and XGBoost classifier. In attempts to increase the recognition performance for images completely occluded in the eye region, we present a method to reconstruct this information by using a variation of a U-Net, and from the classification perspective, we also train the classifier on filtered images to increase the performance of recognition. Our experimental results showed good recognition of individuals when filters were not occluding important landmarks, especially around the eye region. Our proposed solution shows an ability to mitigate the occlusion done by filters through either reconstruction or training on manipulated images, in some cases, with an increase in the classifier’s accuracy of approximately 17% points with only reconstruction, 16% points when the classifier trained on filtered data, and 24% points when both were used at the same time. When training on filtered images, we observe an average increase in performance, across all datasets, of 9.7% points.

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Jagiello, Kristin, Mahmut Zafer Aydin, and Wei-Ren Ng. "Joint JPEG2000/LDPC Code System Design for Image Telemetry." International Foundation for Telemetering, 2008. http://hdl.handle.net/10150/606217.

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ITC/USA 2008 Conference Proceedings / The Forty-Fourth Annual International Telemetering Conference and Technical Exhibition / October 27-30, 2008 / Town and Country Resort & Convention Center, San Diego, California
This paper considers the joint selection of the source code rate and channel code rate in an image telemetry system. Specifically considered is the JPEG2000 image coder and an LDPC code family. The goal is to determine the optimum apportioning of bits between the source and channel codes for a given channel signal-to-noise ratio and total bit rate, R(total). Optimality is in the sense of maximum peak image SNR and the tradeoff is between the JPEG2000 bit rate R(source) and the LDPC code rate R(channel). For comparison, results are included for the industry standard rate-1/2, memory-6 convolutional code.

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Krejci, Roman. "Open-source intelligence in the Czech military : knowledge system and process design /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Jun%5FKrejci.pdf.

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Rumph, Steven E. "Development of four-element end-fire array as seismo-acoustic sonar source." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03sep%5FRumph.pdf.

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Thesis (M.S. in Engineering Acoustics)--Naval Postgraduate School, September 2003.
Thesis advisor(s): Steven R. Baker, Thomas G. Muir. Includes bibliographical references (p. 89-90). Also available online.

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Pistacchio, David J. "Source/receiver motion-induced Doppler influence on the bandwidth of sinusoidal signals." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Dec%5FPistacchio.pdf.

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Thesis (M.S. in Engineering Acoustics)--Naval Postgraduate School, December 2003.
Thesis advisor(s): Kevin Smith, Roy Streit. Includes bibliographical references (p. 95-100). Also available online.

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Choi, Kai-san. "Automatic source camera identification by lens aberration and JPEG compression statistics." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B38902345.

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Choi, Kai-san, and 蔡啟新. "Automatic source camera identification by lens aberration and JPEG compression statistics." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B38902345.

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Coward, Helge. "Joint Source-channel Coding : Development of Methods and Utilization in Image Communications." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, 2001. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-526.

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In a traditional communication system, the coding process is divided into source coding and channel coding. Source coding is the process of compressing the source signal, and channel coding is the process of error protection. It can be shown that with no delay or complexity constraints and with exact knowledge of the source and channel properties, optimal performance can be obtained with separate source and channel coding. However, joint source-channel coding can lead to performance gains under complexity or delay constraints and offer robustness against unknown system parameters.

Multiple description coding is a system for generating two (or more) descriptions of a source, where decoding is possible from either description, but decoding of higher quality is possible if both descriptions are available. This system has been proposed as a means for joint source-channel coding. In this dissertation, the multiple description coding is used to protect against loss of data in an error correcting code caused by a number of channel errors exceeding the correcting ability of the channel code. This is tried on three channel models: a packet erasure channel, a binary symmetric channel, and a block fading channel, and the results obtained with multiple description coding is compared against traditional single description coding. The results show that if a long-term average mean square error distortion measure is used, multiple description coding is not as good as single description coding, except when the delay or block error rate of the channel code is heavily constrained.

A direct source-channel mapping is a mapping from amplitude continuous source symbols to amplitude continuous channel symbols, often involving a dimension change. A hybrid scalar quantizer-linear coder (HSQLC) is a direct source-channel mapping where the memoryless source signal is quantized using a scalar quantizer. The quantized value is transmitted on an analog channel using one symbol which can take as many levels as the quantizer, and the quantization error is transmitted on the same channel by means of a simple linear coder. Thus, there is a bandwidth expansion, two channel symbols are produced per source symbol. The channel is assumed to have additive white Gaussian noise and a power constraint. The quantizer levels and the distribution of power between the two symbols are optimized for different source distributions. A uniform quantizer with an appropriate step size gives a performance close to the optimized quantizer both for a Gaussian, a Laplacian, and a uniform memoryless source. The coder performs well compared to other joint source-channel coders, and it is relatively robust against variations in the channel noise level.

A previous image coder using direct source-channel mappings is improved. This coder is a subband coder where a classification following the decorrelating filter bank assigns mappings of different rates to different subband samples according to their importance. Improvements are made to practically all the parts of the coder, but the most important one is that the mappings are changed, and particularly, the bandwidth expanding HSQLC is introduced. The coder shows large improvements compared to the previous version, especially at channel qualities near the design quality. For poor channels or high rates, the HSQLC provides a large portion of the improvement. The coder is compared against a combination of a JPEG 2000 coder and a good channel code, and the performance is competitive with the reference, while the robustness against an unknown channel quality is largely improved. This kind of robustness is very important in broadcasting and mobile communications.

I tradisjonelle kommunikasjonssystemer kan kodingen deles inn i kildekoding (kompresjon) og kanalkoding (feilbeskyttelse). Disse operasjonene kan ses i sammenheng, og kombinert kilde- og kanalkoding kan gi forbedringer ved begrenset kompleksitet eller forsinkelse, og øke robustheten mot ukjente systemparametre. I avhandlingen vurderes to metoder. I den første er kilde- og kanalkodingen fortsatt delvis separat, men kildekoden er gjort robust mot dekodingsfeil i kanalkoden. Dette gjøres ved flerbeskrivelseskoding (multiple description coding), der kildesignalet representeres med to beskrivelser. Dekoding er mulig fra hver beskrivelse isolert, men høyere kvalitet kan oppnås hvis begge beskrivelsene er tilgjengelig. Ved sammenligning med et tradisjonelt system viser det seg at med hensyn på midlere kvadratisk avvik er flerbeskrivelseskoding som regel mindre bra enn et tradisjonelt system. Direkte kilde-til-kanal-avbildninger er avbildninger fra amplitudekontinuerlige kildesymboler direkte til amplitudekontinuerlige kanalsymboler. En slik metode blir lansert. Der skalarkvantiseres kildesignalet, som antas minneløst, og overføres med ett symbol på en analog kanal, mens kvantiseringsfeilen overføres analogt på den samme kanalen. Systemparametrene blir optimalisert for forskjellige kilder og kanalkvaliteter. Denne koderen gir bra ytelse sammenlignet med andre kombinerte kilde- og kanalkodere, og den er relativt robust mot variasjoner i støynivået på kanalen. Direkte kilde-til-kanal-avbildninger anvendes i en delbåndskoder for stillbilder. Denne koderen, som er basert på tidligere arbeider, blir sammenlignet med en kombinasjon av en JPEG 2000-koder og en god kanalkode, og ytelsen er omtrent like bra som referansen, samtidig som robustheten mot ukjent kanalkvalitet har økt kraftig. Denne typen robusthet er svært viktig i kringkasting og mobilkommunikasjon.

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Sun, Yong. "Source-channel coding for robust image transmission and for dirty-paper coding." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4800.

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In this dissertation, we studied two seemingly uncorrelated, but conceptually related problems in terms of source-channel coding: 1) wireless image transmission and 2) Costa ("dirty-paper") code design. In the first part of the dissertation, we consider progressive image transmission over a wireless system employing space-time coded OFDM. The space-time coded OFDM system based on a newly built broadband MIMO fading model is theoretically evaluated by assuming perfect channel state information (CSI) at the receiver for coherent detection. Then an adaptive modulation scheme is proposed to pick the constellation size that offers the best reconstructed image quality for each average signal-to-noise ratio (SNR). A more practical scenario is also considered without the assumption of perfect CSI. We employ low-complexity decision-feedback decoding for differentially space- time coded OFDM systems to exploit transmitter diversity. For JSCC, we adopt a product channel code structure that is proven to provide powerful error protection and bursty error correction. To further improve the system performance, we also apply the powerful iterative (turbo) coding techniques and propose the iterative decoding of differentially space-time coded multiple descriptions of images. The second part of the dissertation deals with practical dirty-paper code designs. We first invoke an information-theoretical interpretation of algebraic binning and motivate the code design guidelines in terms of source-channel coding. Then two dirty-paper code designs are proposed. The first is a nested turbo construction based on soft-output trellis-coded quantization (SOTCQ) for source coding and turbo trellis- coded modulation (TTCM) for channel coding. A novel procedure is devised to balance the dimensionalities of the equivalent lattice codes corresponding to SOTCQ and TTCM. The second dirty-paper code design employs TCQ and IRA codes for near-capacity performance. This is done by synergistically combining TCQ with IRA codes so that they work together as well as they do individually. Our TCQ/IRA design approaches the dirty-paper capacity limit at the low rate regime (e.g., < 1:0 bit/sample), while our nested SOTCQ/TTCM scheme provides the best performs so far at medium-to-high rates (e.g., >= 1:0 bit/sample). Thus the two proposed practical code designs are complementary to each other.

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Montes, Luis Roger Atero. "Resilient evolutionary source coding for wireless mobile TV/video image communication systems." Thesis, Staffordshire University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311039.

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Buck, Nicole V. "Implementation of an Open-Source Digital Image Correlation Software for Structural Testing." DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2215.

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This thesis investigates the appropriateness of a simplified, open-source digital image correlation (DIC) software for use in quasi-static, structural testing utilizing two-dimensional (2D) DIC measurements. DIC is a non-contact optical measurement technique that uses computer vision to track unique attributes on the surface of an object. For structural testing, traditional instrumentation such as displacement sensors and strain gages are impractical for full field measurements due their limited ability to capture large amounts of data. However, over the past decade, DIC has proven a successful method for full-field kinematics measurements, making it an appealing tool for collecting high densities of accurate data. This thesis specifically studies the accuracy and limitations of the DIC software, MODEM, for various test specimens and loading conditions. This research work is part of an experimental program comprised of three phases. The first stage was conducted by another investigator on aluminum coupons tested in pure tension. These results were used to calibrate parameters (speckle pattern density, lighting, and camera settings) used with the DIC software. The second stage included pure compression tests on concrete cubes and concrete cylinders to compare the difference in results between: (i) surface curvature, (ii) camera distance, (iii) surface treatment, and (iv) speckle pattern color. The final stage involved analysis of a tension test of a concrete prism completed at the University of Auckland in an effort to assess how MODEM could be utilized to accurately detect onset and propagation of concrete cracking. Results showed the most accurate DIC strains were within 5% error when compared to traditional instrumentation for aluminum loaded in tension and within 6% error for concrete loaded in compression/tension. This level of accuracy is comparable to existing open source and commercial DIC software utilizing 2D DIC analysis. Therefore, MODEM can be used to provide accurate 2D DIC strain measurements for small and medium scale structural test specimens when using the following parameters: (i) the surface of the specimen is planar, (ii) the camera is placed accordingly so the maximum amount of zoom can be used, (iii) the surface of a test specimen is free of debris or imperfections, and (iv) a high contrast and evenly distributed speckle pattern is used. Computational analysis of the results showed that known material properties can be used to calibrate, or remove errors from, the DIC results when traditional instrumentation is not available. Additionally, results showed MODEM strain contours can be used for initial detection of cracks in concrete loaded in tension while MODEM tracking performance can be used to characterize the centerline and orientation of cracks. The experimental tests provide critical information on how to set up, run, and analyze DIC results when using MODEM. The full field measurements are of value in providing accurate data for structural testing to develop a better understanding of material response and structural performance, since large-scale tests are typically limited by a sparse number of data points when using traditional instrumentation.

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Duke, Connor R. "Optimization of control source and error sensor locations in free field active noise control /." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd2087.pdf.

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Ma, KeYang. "Hydrocarbon source and depositional environments in the central Papual Basin, Papua New Guinea /." [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18901.pdf.

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Collins, Christopher Michael. "Development of a Virtual Acoustic Showroom for Simulating Listening Environments and Audio Speakers." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/9965.

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Virtual acoustic techniques can be used to create virtual listening environments for multiple purposes. Using multi-speaker reproduction, a physical environment can take on the acoustical appearance of another environment. Implementation of this environment auralization could change the way customers evaluate speakers in a retail store. The objective of this research is to develop a virtual acoustic showroom using a multi- speaker system. The two main components to the virtual acoustic showroom are simulating living environments using the image source method, and simulating speaker responses using inverse filtering. The image source method is used to simulate realistic living environments by filtering the environment impulse response by frequency-dependant absorption coefficients of typical building materials. Psychoacoustic tests show that listeners can match virtual acoustic cues with appropriate virtual visual cues. Inverse filtering is used to "replace" the frequency response function of one speaker with another, allowing a single set of speakers to represent any number of other speakers. Psychoacoustic tests show that listeners could not distinguish the difference between the original speaker and the reference speaker that was mimicking the original. The two components of this system are shown to be accurate both empirically and psychologically.
Master of Science

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Earp, Matthew N. "All Hexahedral Meshing of Multiple Source, Multiple Target, Multiple Axis Geometries Via Automatic Grafting and Sweeping." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd762.pdf.

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Congedo, Marco. "EEG Source Analysis." Habilitation à diriger des recherches, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00880483.

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Electroencephalographic data recorded on the human scalp can be modeled as a linear mixture of underlying dipolar source generators. The characterization of such generators is the aim of several families of signal processing methods. In this HDR we consider in several details three of such families, namely 1) EEG distributed inverse solutions, 2) diagonalization methods, including spatial filtering and blind source separation and 3) Riemannian geometry. We highlight our contributions in each of this family, we describe algorithms reporting all necessary information to make purposeful use of these methods and we give numerous examples with real data pertaining to our published studies. Traditionally only the single-subject scenario is considered; here we consider in addition the extension of some methods to the simultaneous multi-subject recording scenario. This HDR can be seen as an handbook for EEG source analysis. It will be particularly useful to students and other colleagues approaching the field.

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Delorey, Daniel Pierce. "Observational Studies of Software Engineering Using Data from Software Repositories." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1716.pdf.

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Raja, Nouman Saeed. "Combined source-channel coding for a power and bandwidth constrained noisy channel." Texas A&M University, 2003. http://hdl.handle.net/1969.1/1589.

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This thesis proposes a framework for combined source-channel coding under power and bandwidth constrained noisy channel. The framework is then applied to progressive image coding transmission using constant envelope M-ary Phase Shift Key (MPSK) signaling over an Additive White Gaussian Channel (AWGN) channel. First the framework for uncoded MPSK signaling is developed. Then, its extended to include coded modulation using Trellis Coded Modulation (TCM) for MPSK signaling. Simulation results show that coded MPSK signaling performs 3.1 to 5.2 dB better than uncoded MPSK signaling depending on the constellation size. Finally, an adaptive TCM system is presented for practical implementation of the proposed scheme, which outperforms uncoded MPSK system over all signal to noise ratio (Es/No) ranges for various MPSK modulation formats. In the second part of this thesis, the performance of the scheme is investigated from the channel capacity point of view. Using powerful channel codes like Turbo and Low Density Parity Check (LDPC) codes, the combined source-channel coding scheme is shown to be within 1 dB of the performance limit with MPSK channel signaling.

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Heaton, Matthew J. "Temporally Correlated Dirichlet Processes in Pollution Receptor Modeling." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1861.pdf.

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Grover, Brett D. "Measurement, characterization, and source apportionment of the major chemical components of fine particulate material, including semi-volatile species /." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd1174.pdf.

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Jelena, Stojanov. "Anisotropic frameworks for dynamical systems and image processing." Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2015. https://www.cris.uns.ac.rs/record.jsf?recordId=93698&source=NDLTD&language=en.

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The research topic of this PhD thesis is a comparative analysis of classical specic geometric frameworks and of their anisotropic extensions; the construction of three different types of Finsler frameworks, which are suitable for the analysis of the cancer cells population dynamical system; the development of the anisotropic Beltrami framework theory with the derivation of the evolution ow equations corresponding to different classes of anisotropic metrics, and tentative applications in image processing.
Predmet istraživanja doktorske disertacije je uporedna analiza klasičnih i specifičnih geometrijskih radnih okruženja i njihovih anizotropnih proširenja; konstrukcija tri Finslerova radna okruženja različitog tipa koja su pogodna za analizu dinamičkog sistema populacije kanceroznih ćelija; razvoj teorije anizotropnog Beltramijevog radnog okruženja i formiranje jednačina evolutivnog toka za različite klase anizotropnih metrika, kao i mogućnost primene dobijenih teorijskih rezultata u digitalnoj obradi slika.

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Bae, Soo Hyun. "Information retrieval via universal source coding." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26573.

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Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009.
Committee Chair: Juang, Biing-Hwang; Committee Member: Al-Regib, Ghassan; Committee Member: Linda Wiils; Committee Member: Mersereau, Russell; Committee Member: Pappas, Thrasyvoulos. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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Sanja, Maksimović-Moićević. "Predlog nove mere za ocenu kvaliteta slike prilikom interpolacije i njena implementacija u računarskoj obradi signal slike." Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2015. http://www.cris.uns.ac.rs/record.jsf?recordId=95429&source=NDLTD&language=en.

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Osnovni doprinos ove doktorske disertacije je razvoj algortima i sistema za objektivnu procenu vizuelnog kvaliteta slike uzimajući u obzir najvažnija moguća oštećenja kao što su zamućenje ivica (oštrina) i poremećaj prirodnog izgleda teksture objekata na slici sa jedne strane i uticaj sadržaja slike (procenta ivica u slici) na procenu kvaliteta sa druge strane. Dakle, hipoteza izneta u ovom radu je da je potreban multiparametarski pristup da bi se dobila objektivna procena kvaliteta slike koja je što približnija subjektivnoj proceni.

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Dissertations / Theses on the topic 'Source image'

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