Tesis sobre el tema "Visual representation"
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1
Pihlström, Max. "Visual representation by triangulation". Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-264109.
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n this thesis the triangulation is treated as a general-purpose visual representation by investigation of various domain-specific methods such as triangulation interpolation, mesh flows, vertex neighborhood feature measures and re-triangulation for spatial transformations. Suggested new methods include an effective cost for image interpolation based on work by Sederberg et al. and a ridge-edge measure related to the Harris edge detector.
2
Mazein, Alexander. "Visual representation of cellular networks". Thesis, University of Edinburgh, 2011. http://hdl.handle.net/1842/5295.
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Development of advanced techniques for biological network visualisation is crucial for successful progress in the areas of systems-level biology and data-intensive bioinformatics. However, current techniques for biological network visualisation fall short of expectations for representing extensive biological networks. In order to provide really useful network visualisation tools, new approaches have to be proposed and applied alongside with those most powerful features of current visualisation systems. The resulting representation techniques have to be tested by applying to large-scale examples that would include metabolic, signaling and gene expression events. User survey should also be carried out to further prove the advantages of the new techniques. The present thesis describes an attempt to achieve the above objectives, by performing the following steps: 1) existing approaches in the area of network representation were analyzed and their shortcomings and advantages were defined; 2) new notation has been developed, in which, the defined best features of the existing systems were integrated with newly introduced potent features such as compact visualization, ‘functional gate’ and ‘identity gate’, 4) new framework was developed that allows managing large-scale networks that are represented on different levels of details and different levels of constrains, while keeping each diagram semantically unambiguous, 5) extensive examples, including genome-scaled human metabolic network and TNF-alpha receptor signalling network, were used to prove that the designed notation and the framework can be applied efficiently, and, finally, 6) a notation survey has been carried out to validate the advantages of the newly developed notation over the existing ones.
3
Dakin, S. C. "The visual representation of texture". Thesis, University of Stirling, 1994. http://hdl.handle.net/1893/3503.
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This research is concerned with texture: a source of visual information, that has motivated a huge amount of psychophysical and computational research. This thesis questions how useful the accepted view of texture perception is. From a theoretical point of view, work to date has largely avoided two critical aspects of a computational theory of texture perception. Firstly, what is texture? Secondly, what is an appropriate representation for texture? This thesis argues that a task dependent definition of texture is necessary, and proposes a multi-local, statistical scheme for representing texture orientation. Human performance on a series of psychophysical orientation discrimination tasks are compared to specific predictions from the scheme. The first set of experiments investigate observers' ability to directly derive statistical estimates from texture. An analogy is reported between the way texture statistics are derived, and the visual processing of spatio-luminance features. The second set of experiments are concerned with the way texture elements are extracted from images (an example of the generic grouping problem in vision). The use of highly constrained experimental tasks, typically texture orientation discriminations, allows for the formulation of simple statistical criteria for setting critical parameters of the model (such as the spatial scale of analysis). It is shown that schemes based on isotropic filtering and symbolic matching do not suffice for performing this grouping, but that the scheme proposed, base on oriented mechanisms, does. Taken together these results suggest a view of visual texture processing, not as a disparate collection of processes, but as a general strategy for deriving statistical representations of images common to a range of visual tasks.
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Found, Andrew Paul. "Visual search : process and representation". Thesis, Birkbeck (University of London), 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265002.
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Wang, Zhaoqing. "Self-supervised Visual Representation Learning". Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/29595.
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In general, large-scale annotated data are essential to training deep neural networks in order to achieve better performance in visual feature learning for various computer vision applications. Unfortunately, the amount of annotations is challenging to obtain, requiring a high cost of money and human resources. The dependence on large-scale annotated data has become a crucial bottleneck in developing an advanced intelligence perception system.
Self-supervised visual representation learning, a subset of unsupervised learning, has gained popularity because of its ability to avoid the high cost of annotated data. A series of methods designed various pretext tasks to explore the general representations from unlabeled data and use these general representations for different downstream tasks. Although previous methods achieved great success, the label noise problem exists in these pretext tasks due to the lack of human-annotation supervision, which causes harmful effects on the transfer performance.
This thesis discusses two types of the noise problem in self-supervised learning and designs the corresponding methods to alleviate the negative effects and explore the transferable representations. Firstly, in pixel-level self-supervised learning, the pixel-level correspondences are easily noisy because of complicated context relationships (e.g., misleading pixels in the background). Secondly, two views of the same image share the foreground object and some background information. As optimizing the pretext task (e.g., contrastive learning), the model is easily to capture the foreground object and noisy background information, simultaneously. Such background information can be harmful to the transfer performance on downstream tasks, including image classification, object detection, and instance segmentation. To address the above mentioned issues, our core idea is to leverage the data regularities and prior knowledge. Experimental results demonstrate that the proposed methods effectively alleviate the negative effects of label noise in self-supervised learning and surpass a series of previous methods.
6
Sandy, Shiva S. (Shiva Sean) 1976. "Visual discussions : a visual representation of threaded discussion groups". Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/46256.
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Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.Includes bibliographical references (leaves 39-41).
This is an M.Eng thesis, based on software development work done in collaboration with Lotus Development Corp. In this project we are creating a visual overview of ongoing threads of a discussion database. This will allow users to quickly focus their attention to relevant areas of areas in a large information space.
by Shiva S. Sandy.
S.B.and M.Eng.
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Ellis, R. "Levels of representation for visual objects". Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355746.
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Welchman, Andrew Edward. "Human visual representation and filling-in". Thesis, University of Newcastle Upon Tyne, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327185.
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Bantinaki, Katerina. "The visual character of pictorial representation". Thesis, King's College London (University of London), 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.429510.
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Rakover, Nicolas. "A uniform representation for visual concepts". Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/105965.
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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2016.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 54-55).
We present a method for learning visually-grounded word meanings, given as input a set of videos paired with natural-language sentences describing them. Our method uses a uniform feature representation for all words and word types rather than relying on handcrafted features specific to each word. We learn words in a weakly-supervised manner, with no need for annotated bounding boxes around objects of interest. We encode words as Hidden Markov models such that word models can be composed according to a sentence's semantic structure to efficiently recognize events in videos. We use a discriminative variant of Baum-Welch to learn the parameters for our word models, and demonstrate that our approach is able to learn words capturing appearance, spatial relations, and temporal dynamics.
by Nicolas Rakover.
M. Eng.
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Zhou, Bolei. "Interpretable representation learning for visual intelligence". Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/117837.
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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 131-140).
Recent progress of deep neural networks in computer vision and machine learning has enabled transformative applications across robotics, healthcare, and security. However, despite the superior performance of the deep neural networks, it remains challenging to understand their inner workings and explain their output predictions. This thesis investigates several novel approaches for opening up the "black box" of neural networks used in visual recognition tasks and understanding their inner working mechanism. I first show that objects and other meaningful concepts emerge as a consequence of recognizing scenes. A network dissection approach is further introduced to automatically identify the internal units as the emergent concept detectors and quantify their interpretability. Then I describe an approach that can efficiently explain the output prediction for any given image. It sheds light on the decision-making process of the networks and why the predictions succeed or fail. Finally, I show some ongoing efforts toward learning efficient and interpretable deep representations for video event understanding and some future directions.
by Bolei Zhou.
Ph. D.
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Sharif, Razavian Ali. "Convolutional Network Representation for Visual Recognition". Doctoral thesis, KTH, Robotik, perception och lärande, RPL, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-197919.
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Image representation is a key component in visual recognition systems. In visual recognition problem, the solution or the model should be able to learn and infer the quality of certain visual semantics in the image. Therefore, it is important for the model to represent the input image in a way that the semantics of interest can be inferred easily and reliably. This thesis is written in the form of a compilation of publications and tries to look into the Convolutional Networks (CovnNets) representation in visual recognition problems from an empirical perspective. Convolutional Network is a special class of Neural Networks with a hierarchical structure where every layer’s output (except for the last layer) will be the input of another one. It was shown that ConvNets are powerful tools to learn a generic representation of an image. In this body of work, we first showed that this is indeed the case and ConvNet representation with a simple classifier can outperform highly-tuned pipelines based on hand-crafted features. To be precise, we first trained a ConvNet on a large dataset, then for every image in another task with a small dataset, we feedforward the image to the ConvNet and take the ConvNets activation on a certain layer as the image representation. Transferring the knowledge from the large dataset (source task) to the small dataset (target task) proved to be effective and outperformed baselines on a variety of tasks in visual recognition. We also evaluated the presence of spatial visual semantics in ConvNet representation and observed that ConvNet retains significant spatial information despite the fact that it has never been explicitly trained to preserve low-level semantics. We then tried to investigate the factors that affect the transferability of these representations. We studied various factors on a diverse set of visual recognition tasks and found a consistent correlation between the effect of those factors and the similarity of the target task to the source task. This intuition alongside the experimental results provides a guideline to improve the performance of visual recognition tasks using ConvNet features. Finally, we addressed the task of visual instance retrieval specifically as an example of how these simple intuitions can increase the performance of the target task massively.QC 20161209
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Jonaityte, Inga <1981>. "Visual representation and financial decision making". Doctoral thesis, Università Ca' Foscari Venezia, 2014. http://hdl.handle.net/10579/4593.
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This thesis addresses experimentally three topics concerning the effects of visual representations on financial decision making. First, we hypothesize that visual representation of financial information affects comprehension and decision-making processes and outcomes. To test our hypothesis, we conducted online experiments demonstrating that the choice of visual representation leads to shifts in attention, comprehension, and evaluation of the information. The second study focuses on the ability of financial advisers to provide expert judgment to aid naïve consumers facing financial decisions. We found that advertising content significantly affects both experts and novices. Our results provide a previously underexplored viewpoint of decision making by finance professionals. The third topic concerns our ability to learn from multiple cues, adapt to changes, and develop new strategies. We investigated the effects of salient cues and environmental changes on learning, and found, among other things, that “abrupt” transformations in an environment are more harmful than “smooth” ones.Questa tesi affronta sperimentalmente gli effetti delle rappresentazioni visive sulle decisioni finanziarie. Ipotizziamo che le rappresentazioni visive dell'informazione finanziaria possano influenzare le decisioni. Per testare tali ipotesi, abbiamo condotto esperimenti online e mostrato che la scelta della rappresentazione visiva conduce a cambiamenti nell'attenzione, comprensione, e valutazione dell'informazione. Il secondo studio riguarda l'abilità dei consulenti finanziari di offrire giudizio esperto per aiutare consumatori inesperti nelle decisioni finanziarie. Abbiamo trovato che il contenuto della pubblicità influenza significativamente tanto l'esperto quanto l'inesperto, il che offre una nuova prospettiva sulle decisioni dei consulenti finanziari. Il terzo tema riguarda l'apprendimento da informazioni multidimensionali, l'adattamento al cambiamento e lo sviluppo di nuove strategie. Abbiamo investigato gli effetti dell'importanza delle "cues" e di cambiamenti dell'ambiente decisionale sull'apprendimento. Trasformazioni improvvise nell'ambiente decisionale sono più dannose di trasformazioni graduali.
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Marini, Ludovica Orsola Adriana. "Perception and representation in the visual brain and in visual art". Thesis, University College London (University of London), 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428716.
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Kalaiah, Aravind. "Visual data representation using context-aware Samples". College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2465.
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Thesis (Ph. D.) -- University of Maryland, College Park, 2005.Thesis research directed by: Computer Science. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Rahm, Jonas. "Biologically plausible visual representation of modular decomposition". Thesis, University of Skövde, School of Humanities and Informatics, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-953.
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Modular decompositions of protein interaction networks can be used to identify modules of cooperating proteins. The biological plausibility off these modules might be questioned though. This report describes how a modular decomposition can be completed with semantic information in the visual representation. Possible methods for creating modules of functionally related proteins are also proposed in this work. The results show that such modules, with advantage can be combined with modules from a graph decomposition, to find proteins that are likely to cooperate to perform certain functions in organisms
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Wong, Gladys Magali. "Depiction and domains in visual knowledge representation". Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/26207.
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Systems need knowledge to behave intelligently in a complex environment. This thesis presents a formalism for characterizing the knowledge in a world while providing a framework that can be utilzed efficiently in computation. Thus Domain Theory is developed as a knowledge representation scheme.
Under Domain Theory, the knowledge in a world is divided into domains that are interrelated through the relation of representation. This theory is evaluated as appropriate for knowledge representation using descriptive and procedural adequacy criteria.
Domain Theory is applied to produce a working system called Depicts. Depicts is written in Prolog which is well suited for implementing Domain Theory. Given a graphical representation, Depicts returns a relational description and, conversely, given a relational description, Depicts returns a graphical representation.Science, Faculty of
Computer Science, Department of
Graduate
18
Lacey, Simon. "Mental representation in visual/haptic crossmodal memory". Thesis, Southampton Solent University, 2005. http://ssudl.solent.ac.uk/589/.
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It is an unresolved question whether the mental representations that enable visual/haptic crossmodal memoory for objects are modality-specific - either visual (Zhang et al., 2004) and/or haptic (Reed et al., 2004); modality-independent - either abstract (Easton et al., 1997) or structural but still in some way abstract (Reales & Ballesteros, 1999); or dual code - visual for unfamiliar objects but visual and verbal for familiar objects (Johnson et al., 1989). The thesis argues that dual-code representation can be parsimoniously reduced to visual representation, with verbal processes relegated to strategic roled, and that visual representation can be reduced to spatial representation. Spatial representation can be defined as containing information about size, shape and the arrangement of different object parts and features relative to each other, and is a novel hypothesis in visual/haptic crossmodal memory. Seven experiments tested existing theories and the novel hypothesis primarily through the innovative use of interference techniques. These experiments showed that there was no evidence for strictly abstract representation or for the main predictions of the dual-code account. There was no effect of interference on familiar objects and it is suggested that these are either resistant to interference because they involce deep long-term memory representations or that they are represented through an associative network of different representations. The novel hypothesis of spatial representation was supported in experiments that contrasted visual and haptic, spatial and non-spatial interference. These showed strongly that the modality of the interference was irrelevant and that spatiality was the key factor. Whether itoccured during encoding or retrieval, spatial interference disrupted performance regardless of its modality and also disrupted the visual-haptic and haptic-visual conditions equally. The thesis concludes that visual/haptic crossmodal memory is enabled by modality-indeopendent spatial representation. This new finding is an original and theoretically important contribution because it specifies the format of a modality-independent representation and solves two of the three main task constraints: how any kind of object can be re[presented via both vision and touch. It is also a generative source of hypotheses about the third constraint: why error is systematically greater in the haptic-visual condition than the visual-haptic condition.
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Nowbati, Behzad. "Visual information and knowledge representation in organisations". Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/8467.
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The construction industry's environment is continually changing. Employees are now more geographically widespread and diverse, both culturally and educationally, than ever before. A great deal of research has been carried out on knowledge acquisition and storage, but there is still a distinct lack of research into knowledge presentation and communication. Information and knowledge presentation play a significant role in daily decision-making processes, when inappropriate decisions may result from inaccurate or poorly communicated information. The simplified, filtered coherent presentation of explicit knowledge can be instrumental to a successful, profitable and safety conscious business. Wates Construction is a major construction company and employs around 1300 people directly, as well as various subcontractors on different projects. Their current turn over is around £1billion, they are based in the UK and have branches in Ireland and Abu Dhabi. Wates realised their existing information system was inefficiently conveying information to its employees and the need to provide a simplified system, to assist staff's decision-making processes. Earlier IT professionals' attempts to make the system more usable had made no significant difference to its performance.
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Soares, Gonçalo Ducla 1977. "Audio-visual frameworks for design process representation". Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28477.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Architecture, 2004.Includes bibliographical references (p. 97-100).
The design process is based on a recursive and iterative feedback between a designer's ideas and their physical representation. In most practices, this feedback takes place upon one single medium, which endows the designer with one single view on his ideas. However, having several views can contribute for a deeper and more informed critique of the physical representation of those ideas; ultimately it can lead to a better final product. In the first part of this study, the use of audio-visual interfaces as tools for representing the design process is proposed. The idea is to understand, through simulation, what beneficial effects a process based on multiple feedbacks can potentially have on the actual design. As such, five frameworks mapping graphics to sound were designed and implemented computationally. Although the referred interfaces were in fact designed as a means to support a claim, they mainly stand out as independent objects that carry a significance of their own. The second part of this research explores the relevance of these objects as media that yield new forms of audio-visual design, engage the user in design thinking, and support design education.
by Gonçalo Ducla-Soares.
S.M.
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Simoncelli, Eero Peter. "Distributed representation and analysis of visual motion". Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12590.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1993.Includes bibliographical references (leaves 171-179).
by Eero Peter Simoncelli.
Ph.D.
22
Cave, Kyle R. (Kyle Ray). "The representation of location in visual images". Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/13658.
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Ben-Younes, Hedi. "Multi-modal representation learning towards visual reasoning". Electronic Thesis or Diss., Sorbonne université, 2019. http://www.theses.fr/2019SORUS173.
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La quantité d'images présentes sur internet augmente considérablement, et il est nécessaire de développer des techniques permettant le traitement automatique de ces contenus. Alors que les méthodes de reconnaissance visuelle sont de plus en plus évoluées, la communauté scientifique s'intéresse désormais à des systèmes aux capacités de raisonnement plus poussées. Dans cette thèse, nous nous intéressons au Visual Question Answering (VQA), qui consiste en la conception de systèmes capables de répondre à une question portant sur une image. Classiquement, ces architectures sont conçues comme des systèmes d'apprentissage automatique auxquels on fournit des images, des questions et leur réponse. Ce problème difficile est habituellement abordé par des techniques d'apprentissage profond. Dans la première partie de cette thèse, nous développons des stratégies de fusion multimodales permettant de modéliser des interactions entre les représentations d'image et de question. Nous explorons des techniques de fusion bilinéaire, et assurons l'expressivité et la simplicité des modèles en utilisant des techniques de factorisation tensorielle. Dans la seconde partie, on s'intéresse au raisonnement visuel qui encapsule ces fusions. Après avoir présenté les schémas classiques d'attention visuelle, nous proposons une architecture plus avancée qui considère les objets ainsi que leurs relations mutuelles. Tous les modèles sont expérimentalement évalués sur des jeux de données standards et obtiennent des résultats compétitifs avec ceux de la littératureThe quantity of images that populate the Internet is dramatically increasing. It becomes of critical importance to develop the technology for a precise and automatic understanding of visual contents. As image recognition systems are becoming more and more relevant, researchers in artificial intelligence now seek for the next generation vision systems that can perform high-level scene understanding. In this thesis, we are interested in Visual Question Answering (VQA), which consists in building models that answer any natural language question about any image. Because of its nature and complexity, VQA is often considered as a proxy for visual reasoning. Classically, VQA architectures are designed as trainable systems that are provided with images, questions about them and their answers. To tackle this problem, typical approaches involve modern Deep Learning (DL) techniques. In the first part, we focus on developping multi-modal fusion strategies to model the interactions between image and question representations. More specifically, we explore bilinear fusion models and exploit concepts from tensor analysis to provide tractable and expressive factorizations of parameters. These fusion mechanisms are studied under the widely used visual attention framework: the answer to the question is provided by focusing only on the relevant image regions. In the last part, we move away from the attention mechanism and build a more advanced scene understanding architecture where we consider objects and their spatial and semantic relations. All models are thoroughly experimentally evaluated on standard datasets and the results are competitive with the literature
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Dalens, Théophile. "Learnable factored image representation for visual discovery". Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEE036.
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L'objectif de cette thèse est de développer des outils pour analyser les collections d'images temporelles afin d'identifier et de mettre en évidence les tendances visuelles à travers le temps. Cette thèse propose une approche pour l'analyse de données visuelles non appariées annotées avec le temps en générant à quoi auraient ressemblé les images si elles avaient été d'époques différentes. Pour isoler et transférer les variations d'apparence dépendantes du temps, nous introduisons un nouveau module bilinéaire de séparation de facteurs qui peut être entraîné. Nous analysons sa relation avec les représentations factorisées classiques et les auto-encodeurs basés sur la concaténation. Nous montrons que ce nouveau module présente des avantages par rapport à un module standard de concaténation lorsqu'il est utilisé dans une architecture de réseau de neurones convolutionnel encodeur-décodeur à goulot. Nous montrons également qu'il peut être inséré dans une architecture récente de traduction d'images à adversaire, permettant la transformation d'images à différentes périodes de temps cibles en utilisant un seul réseauThis thesis proposes an approach for analyzing unpaired visual data annotated with time stamps by generating how images would have looked like if they were from different times. To isolate and transfer time dependent appearance variations, we introduce a new trainable bilinear factor separation module. We analyze its relation to classical factored representations and concatenation-based auto-encoders. We demonstrate this new module has clear advantages compared to standard concatenation when used in a bottleneck encoder-decoder convolutional neural network architecture. We also show that it can be inserted in a recent adversarial image translation architecture, enabling the image transformation to multiple different target time periods using a single network
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Matsuno, Toyomi. "A study on visual representation in chimpanzees". 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/136818.
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Perini, Laura Therese. "Visual representations and scientific knowledge /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 2002. http://wwwlib.umi.com/cr/ucsd/fullcit?p3036945.
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Franquet, Dos Santos Silva Miguel. "Ethics and Photojournalism: the visual representation of reality". Doctoral thesis, Universitat Ramon Llull, 2016. http://hdl.handle.net/10803/362943.
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Inspirats en la filosofia moral de Paul Ricoeur, per qui l'ètica general pot contribuir per qüestionar les conviccions on es basa l'ètica aplicada, aquest estudi pretén identificar i qüestionar els principis ètics fonamentals que han fundat la nostra comprensió del que ha de ser una bona fotografia de premsa des de mitjan segle XIX. És la nostra convicció que la recent controvèrsia sobre el World Press Photo, motivada per la dificultat a establir un criteri clar i consensual que permeti distingir el que és un procediment de postproducció legítim i il·legítim, demostra que el vell paradigma de la fotografia analògica va deixar d'estar capacitat per promocionar la confiança en el fotoperiodisme. A través d'una anàlisi històrica i sistemàtic mostrem que fonamentar la credibilitat de la fotografia de premsa en la seva objectivitat, realisme i naturalesa no artística no té ni justificació teòrica ni utilitat pràctica.Inspirados en la filosofía moral de Paul Ricoeur, para quien la ética general puede contribuir para cuestionar las convicciones donde se basa la ética aplicada, este estudio pretende identificar y cuestionar los principios éticos fundamentales que han fundado nuestra comprensión de lo que debe ser una buena fotografía de prensa desde mediados del siglo XIX. Es nuestra convicción que la reciente controversia sobre el World Press Photo, motivada por la dificultad en establecer un criterio claro y consensual que permita distinguir lo que es un procedimiento de postproducción legítimo e ilegítimo, demuestra que el viejo paradigma de la fotografía analógica dejó de estar capacitado para promocionar la confianza en el fotoperiodismo. A través de un análisis histórico y sistemático mostramos que fundamentar la credibilidad de la fotografía de prensa en su objetividad, realismo y naturaleza no artística no tiene ni justificación teórica ni utilidad práctica.
Building on the moral philosophy of Paul Ricoeur, for whom general ethics may play an important role in questioning the longstanding assumptions upon which the applied ethics are grounded, this study aims to identify and challenge the fundamental moral principles that have grounded our understanding of what a good press photograph is since the mid nineteenth-century. It is our contention that the recent controversy surrounding the World Press Photo, motivated by the difficulty for establishing a clear and consensual criterion to distinguish between legitimate and illegitimate post-processing procedures, demonstrates that the old paradigm of the analogue photography is no longer capable of promoting trust and confidence in photojournalism. Through an historical and a systematic analysis, we contend that basing press photography credibility on its objective, realistic and non-artistic nature is neither theoretically justified nor practically useful.
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Mora, Javier. "Hapto-visual representation of three dimensional incompressible flows". Thesis, University of Ottawa (Canada), 2008. http://hdl.handle.net/10393/27600.
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Imagine a videogame in which you impersonate a wizard who needs to create a potion by stirring substances in a cauldron. Through a desktop haptic probe, you are able to stir and feel how the fluid changes its viscosity, velocity and other properties. So far solid or deformable objects have been experimented for haptic-tactile feedback. In this thesis we innovate by devising techniques that enable the haptical rendering of shape-less objects, such as fluids. We achieved the real-time 3D fluid simulation of multiple substances based on the Navier-Stokes equation and coupled it with a discreet mass-spring particle system representing its deformable surface. We overcame the challenges that arise during the integration of both haptics and graphics workspaces, the free-view visualization of 3D fluid volume, and the rendering of haptic forces. Our system is flexible to accommodate different kinds of fluids, such as liquid and smoke, to be co-simulated.
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Cruz, Chú Mariana Beatriz. "Use of visual representation in natural resource management". Thesis, University of Edinburgh, 2008. http://hdl.handle.net/1842/27845.
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The increasing use of visual representation in natural resource management is signed as a promising tool for enhancing the communication with bidirectional flow of information among stakeholders. Some targets are the transfer of scientific knowledge to non-scientific groups and the study of perception that local communities have about their environment. Both of them have critical importance in developing countries. The objective of this thesis was to get further knowledge on some topics and concerns related to the use of photographic material as surrogates of natural grassland areas among shepherds and extension advisers. The thesis developed studies in two main grassland areas of Peru. The first study was carried out in Azangaro, Puno, in the Peruvian High Plateau. This study explored the reliability and validity of the use of visual material in performing assessments about common concepts used in grassland management by extension advisers, whose role in the chain of technology transfer is important in this area. The second area of study was the SAIS Pachacutec, which involves a significant grassland area in Junin, located in the central mountain region of Peru. Two main research topics were investigated in this area. First, there were comparisons in the use of different techniques (random and participatory approaches) for visual sampling in rangelands. And second, the use of photographic material combined with Q methodology was explored for the elicitation of environmental perceptions among shepherds and local administrations. Implications of results for future use of visual representation in natural resource management are discussed.
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Saund, Eric. "The Role of Knowledge in Visual Shape Representation". Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/6833.
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This report shows how knowledge about the visual world can be built into a shape representation in the form of a descriptive vocabulary making explicit the important geometrical relationships comprising objects' shapes. Two computational tools are offered: (1) Shapestokens are placed on a Scale-Space Blackboard, (2) Dimensionality-reduction captures deformation classes in configurations of tokens. Knowledge lies in the token types and deformation classes tailored to the constraints and regularities ofparticular shape worlds. A hierarchical shape vocabulary has been implemented supporting several later visual tasks in the two-dimensional shape domain of the dorsal fins of fishes.
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Giannakis, Melina. "4D Urban Reconstruction and Visual Representation of Time". Thesis, University College London (University of London), 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.515077.
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Jeong, Su Keun. "Flexible visual information representation in human parietal cortex". Thesis, Harvard University, 2014. http://nrs.harvard.edu/urn-3:HUL.InstRepos:13068539.
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In many everyday activities, we must visually process multiple objects embedded in complex real world scenes. Our visual system can flexibly extract behaviorally relevant visual information from such scenes, even though it has a severely limited processing capacity. This dissertation proposes that human superior intra-parietal sulcus (IPS) plays a central role in this flexible visual information processing. In Chapter 1, using functional magnetic resonance imaging (fMRI) with univariate analysis, I found that distractor processing in superior IPS was attenuated when target locations were known in advance. In Chapter 2, using multi-voxel pattern analysis (MVPA), I showed that superior IPS encoded object shapes, but only when such information was required by task. In Chapter 3, I showed that, given a set of perceptually distinct, but semantically grouped visual inputs, superior IPS could represent abstract object identity. The neural similarity of identities in superior IPS significantly correlated with perceived similarity between identities, confirming the representation in this region indeed reflected identity. Taken together, these results suggest that human superior IPS encodes a wide range of visual information, from simple features to abstract identities, in a task-dependent manner, enabling flexible goal-directed visual information processing in the human brain.Psychology
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Jain, Mihir. "Enhanced image and video representation for visual recognition". Phd thesis, Université Rennes 1, 2014. http://tel.archives-ouvertes.fr/tel-00996793.
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L'objectif de cette thèse est d'améliorer les représentations des images et des vidéos dans le but d'obtenir une reconnaissance visuelle accrue, tant pour des entités spécifiques que pour des catégories plus génériques. Les contributions de cette thèse portent, pour l'essentiel, sur des méthodes de description du contenu visuel. Nous proposons des méthodes pour la recherche d'image par le contenu ou par des requêtes textuelles, ainsi que des méthodes pour la reconnaissance et la localisation d'action dans des vidéos. En recherche d'image, les contributions se fondent sur des méthodes à base de plongements de Hamming. Tout d'abord, une méthode de comparaison asymétrique vecteur-à-code est proposée pour améliorer la méthode originale, symétrique et utilisant une comparaison code-à-code. Une méthode de classification fondée sur l'appariement de descripteurs locaux est ensuite proposée. Elle s'appuie sur une classification opérée dans un espace de similarités associées au plongement de Hamming. En reconnaissance d'action, les contributions portent essentiellement sur des meilleures manières d'exploiter et de représenter le mouvement. Finalement, une méthode de localisation est proposée. Elle utilise une partition de la vidéo en super-voxels, qui permet d'effectuer un échantillonnage 2D+t de suites de boîtes englobantes autour de zones spatio-temporelles d'intérêt. Elle s'appuie en particulier sur un critère de similarité associé au mouvement. Toutes les méthodes proposées sont évaluées sur des jeux de données publics. Ces expériences montrent que les méthodes proposées dans cette thèse améliorent l'état de l'art au moment de leur publication.
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Hola, Alicja Krystyna Wanda. "Representation, focus, and movement of covert visual attention". Thesis, Durham University, 2004. http://etheses.dur.ac.uk/3073/.
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This thesis investigated some of the factors involved in the representation, focus, and movement of covert attention in visual space. Existing research has shown that visual cues produced a facilitation of reaction times (RTs) to visual targets appearing at a cued location for up to 300ms. At longer stimulus-onset-asynchronies (SOAs), this was followed by an increase in RTs relative to the uncued location. This has been termed inhibition of return (lOR). Experiments 1-6 used LED cues which were the same as, or spatially distinct from, a target LED, and were either informative or uninformative about the target location. Results were inconsistent. Where discrimination problems existed, the cue/target probabilities altered the results: from evidence of inhibitory effects, to no significant cue-side effects. Where no discrimination problems existed, facilitatory effects were apparent, and were enhanced by an increased cue/target probability. Experiments 7-10, using exogenous cueing, manipulated attentional focus and the presence of cue-markers. Altering the focus size did not substantiate previous findings of a reciprocal relationship between focus and performance. The removal of cue-markers resulted in increased amounts of inhibition not supporting current single- or dual-component views of lOR. Previous work has shown that informative symbolic visual cues produced costs and benefits of RTs to visual targets. Experiments 11-16, using static endogenous cueing with targets framed in central and peripheral locations, attempted to demonstrate object-based attentional representation. All six experiments showed significant effects due to SOA and cue validity, however, initial results showed no evidence of stimulus-grouping. Only when target position markers were removed, when peripheral targets were used, and when inside/outside location judgements were required instead of target detection, did results indicate some possibility of grouped attentional representation. Finally, several of the experiments also investigated the nature of attentional movement. Results did not support straightforward analogue explanations.
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Isserow, Jonathan. "Documenting interiority : visual research and representation in psychoanalysis". Thesis, University College London (University of London), 2017. http://discovery.ucl.ac.uk/10028047/.
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On first consideration, documentary film and psychoanalysis seem incompatible. Historically, documentary film has privileged the visual in exploring the social world, whilst psychoanalysis has privileged the aural in apprehending the internal world. Despite this apparent incompatibility, documentary film was productively employed in psychoanalytic research in the 1950s and 1960s by a handful of ocularcentric psychoanalysts. In an attempt to address the gap between looking from the outside while seeing on the inside, this investigation examines the synthesis of both fields by evaluating the genre’s capacity to document interiority. It asks: how can documentary film function as a visual methodology in the psychoanalytic production of knowledge of interiority? Through an innovative methodological approach, this is addressed from the filmmaker’s perspective, in which psychoanalytic epistemological debates are transposed onto three documentary film forms. These include the polemical discussions between clinical and observational research in psychoanalysis, explored through the essay film; the use of linear temporality, examined in observational film; and the notion of après coup, or afterwardsness, that attends to memory and meaning through the compilation film. From this theoretical and practice-based enquiry, this research develops the notion of the temporalised gaze that may produce psychoanalytically informed constructions of subjectivities in documentary film. In making this gaze visible, it argues that documentary filmmakers and psychoanalytic visual researchers require greater reflexivity of how temporal ways of looking construct interiority. Therefore, this investigation establishes a psychoanalytic methodological base on which a plurality of visual subjectivities may be developed. It calls for the revival of the ethical and reflexive use of documentary film in psychoanalytic research.
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Coggan, David. "The neural representation of objects in visual cortex". Thesis, University of York, 2019. http://etheses.whiterose.ac.uk/22899/.
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Neuroimaging studies have shown that different categories of object evoke different neural responses in the ventral visual pathway. This has been interpreted to suggest that these regions represent high-level conceptual or semantic properties of the stimulus, such as its category. However, images from different categories differ in low-level visual properties. Therefore, the extent to which category-specific neural responses indicate high-level or low-level representations is unclear. This thesis investigates the extent to which low-level properties of objects are important in the neural response of ventral visual pathway. The first study uses a data-driven approach to select clusters of objects based on the similarity of their low-level visual properties. These visually defined clusters did not correspond to typical object categories, but still evoked distinct patterns of response in the ventral stream. The second and third studies show category-specific patterns of response in the ventral stream to scrambled objects that are not recognizable, but nevertheless retain many of their low-level visual properties. The fourth study reveals that the bias toward natural object images found in the ventral stream begins to emerge in early visual areas. The final chapter shows that category-specific patterns of EEG response can be also explained by low-level image properties. Taken together, these results demonstrate the importance of low-level visual properties in the neural representation of objects. These findings suggest that the category-selectivity observed in high-level visual regions can be explained by a distributed organization based around more basic properties of the stimulus.
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Cadieu, Charles Fredrick. "Modeling shape representation in visual cortex area V4". Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/30367.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 85-89).
Visual processing in biological systems is classically described as a hierarchy of increasingly sophisticated representations, originating in primary visual cortex (V1), progressing through intermediate area V4, and ascending to inferotemporal cortex. The computational mechanisms that produce representations in intermediate area V4 have remained a mystery. In this thesis I show that the standard model, a quantitative model which extends the classical description of visual processing, provides a computational mechanism capable of reproducing and predicting the responses of neurons in area V4 with a translation invariant combination of V1 responses. Using techniques I have developed, model neurons accurately predict the responses of 8 V4 neurons to within-class stimuli, such as closed contours and gratings, and achieve an average correlation coefficient of 0.77 between predicted responses and measured V4 responses. Furthermore, model neurons fit to a V4 neuron's grating stimulus response, can qualitatively predict the V4 neuron's 2-spot reverse correlation map. These results successfully demonstrate the first attempt to bridge V1 and V4 experimental data, by describing how representation in V4 could emerge from the nonlinear combination of V1 neural responses.
by Charles Fredrick Cadieu.
M.Eng.
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Sadr, Javid 1973. "Visual perception and representation of objects and faces". Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/29988.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Brain and Cognitive Sciences, 2003.Includes bibliographical references (leaves 87-95).
Interpreting the results of visual object perception experiments is too often ill-posed due to the disparate and sparse choice of stimuli. To address this problem, we have developed a flexible new technique called Random Image Structure Evolution (RISE). In the simplest case, RISE involves the presentation of image sequences depicting the evolution of a coherent image from a seemingly random field, along with the reverse sequences depicting the transformation back into randomness. As it samples a subset of the space of possible stimulus images, RISE image processing strictly preserves low-level attributes such as frequency spectra and luminance, and RISE experiments are designed to provide objectively verifiable measures of the onset and offset of subjects' conscious percepts. In turn, these onset and offset measures can serve as quantitative markers for characterizing a number of intriguing perceptual phenomena. Here I describe the basic RISE paradigm and discuss experimental applications of this technique which, it is hoped, may contribute greatly to the study of key aspects of high-level vision. Building on results from psychophysical studies of perceptual onset, priming, and hysteresis, as well as findings from a magnetoencephalographic study using RISE, this thesis explores the use of RISE in characterizing the perceptual markers and neural substrates of object and face perception. In addition, this thesis examines the issue of object perception and, in particular, robust face perception, within the context of the cortical representations that may underly them, presenting and evaluating a simple, well-motivated image coding scheme based on ordinal relations.
by Javid Sadr.
Ph.D.
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Kim, Yong-Guk. "Visual surface representation for transparency, occlusion and brightness". Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624737.
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Freeman, Jeremy. "Computation and representation in the primate visual system". Thesis, New York University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10143918.
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The purpose of vision is to find behaviorally relevant structure in the ever-flowing chaos of sensory input. In the primate, this goal is achieved by a hierarchy of cortical areas that extract increasingly complex forms of information from the light arriving at the retina. Despite success characterizing the early stages of this pathway — the retina, the lateral geniculate nucleus, and primary visual cortex (V1) — we have a poor understanding of how transformations in later stages yield selectivity for the complex shapes and objects that primates readily recognize.
According to a classical, constructionist view, the later stages of the visual system assemble elementary inputs — like the oriented features encoded by V1 — into larger and more complex combinations, capturing the structural relationships that determine the visual world. But this approach has stumbled on the enigmatic second visual area, V2, whose neurons defy our intuitions about how to begin segmenting scenes and encoding the shapes of objects.
In this thesis we develop a framework for the study of intermediate visual processing in the primate, focused on computation and representation in area V2. Rather than try to predict the responses of visual neurons to arbitrary inputs, we test hypotheses about their function by generating targeted experimental stimuli. The stimuli we use reflect the messy statistical reality of natural images, rather than intuitions about object construction. We identify novel responses properties in macaque and human V2 that robustly differentiates it from V1. We propose mechanistic explanations for these properties by contextualizing them among existing models of hierarchical computation. And we link these properties to several perceptual capabilities -- and limits -- that appear to depend specifically on processing in V2, and imply striking consequences for everyday vision.
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Yu, Mengyang. "Feature reduction and representation learning for visual applications". Thesis, Northumbria University, 2016. http://nrl.northumbria.ac.uk/30222/.
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Computation on large-scale data spaces has been involved in many active problems in computer vision and pattern recognition. However, in realistic applications, most existing algorithms are heavily restricted by the large number of features, and tend to be inefficient and even infeasible. In this thesis, the solution to this problem is addressed in the following ways: (1) projecting features onto a lower-dimensional subspace; (2) embedding features into a Hamming space. Firstly, a novel subspace learning algorithm called Local Feature Discriminant Projection (LFDP) is proposed for discriminant analysis of local features. LFDP is able to efficiently seek a subspace to improve the discriminability of local features for classification. Extensive experimental validation on three benchmark datasets demonstrates that the proposed LFDP outperforms other dimensionality reduction methods and achieves state-of-the-art performance for image classification. Secondly, for action recognition, a novel binary local representation for RGB-D video data fusion is presented. In this approach, a general local descriptor called Local Flux Feature (LFF) is obtained for both RGB and depth data by computing the local fluxes of the gradient fields of video data. Then the LFFs from RGB and depth channels are fused into a Hamming space via the Structure Preserving Projection (SPP), which preserves not only the pairwise feature structure, but also a higher level connection between samples and classes. Comprehensive experimental results show the superiority of both LFF and SPP. Thirdly, in respect of unsupervised learning, SPP is extended to the Binary Set Embedding (BSE) for cross-modal retrieval. BSE outputs meaningful hash codes for local features from the image domain and word vectors from text domain. Extensive evaluation on two widely-used image-text datasets demonstrates the superior performance of BSE compared with state-of-the-art cross-modal hashing methods. Finally, a generalized multiview spectral embedding algorithm called Kernelized Multiview Projection (KMP) is proposed to fuse the multimedia data from multiple sources. Different features/views in the reproducing kernel Hilbert spaces are linearly fused together and then projected onto a low-dimensional subspace by KMP, whose performance is thoroughly evaluated on both image and video datasets compared with other multiview embedding methods.
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Watson, David M. "The neural representation of scenes in visual cortex". Thesis, University of York, 2016. http://etheses.whiterose.ac.uk/12961/.
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Recent neuroimaging studies have identified a number of regions in the human brain that respond preferentially to visual scenes. These regions are thought to underpin our ability to perceive and interact with our local visual environment. However, the precise stimulus dimensions underlying the function of scene-selective regions remain controversial. Some accounts have proposed an organisation based on relatively high-level semantic or categorical properties of the stimulus. However, other accounts have suggested that lower-level visual features of the stimulus may offer a more parsimonious explanation. This thesis presents a series of fMRI experiments employing multivariate pattern analyses (MVPA) in order to test the role of low-level visual properties in the function of scene-selective regions. The first empirical chapter presents two experiments showing that patterns of neural response to different scene categories can be predicted by a model of the visual properties of scenes (GIST). The second empirical chapter demonstrates that direct manipulations of the spatial frequency content of the image significantly influence the patterns of response, with effects often being comparable to or greater than those of scene category. The third empirical chapter demonstrates that distinct patterns of response can be found to different scene categories even when images are Fourier phase scrambled such that low-level visual features are preserved, but perception of the categories is impaired. The fourth and final empirical chapter presents an experiment using a data-driven method to select clusters of scenes objectively based on their visual properties. These visually defined clusters did not correspond to typical scene categories, but nevertheless elicited distinct patterns of neural response. Taken together, these results support the importance of low-level visual features in the functional organisation of scene-selective regions. Scene-selective responses may arise from the combined sensitivity to multiple visual features that are themselves predictive of scene content.
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Stryz, Jan A. "Memorial pictures: Visual representation in the American Romance". Diss., The University of Arizona, 1991. http://hdl.handle.net/10150/185575.
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The American Romance is characterized by its use of memorial images which contribute in developing the form and content of its individual literary works. Readings of works by four authors who fall within the American Romance tradition--Hawthorne, James, Faulkner, and Toni Morrison--reveal a poetics of memory that operates in terms of tensions between word and image, with memory achieving apparent embodiment through the image, while the simple presence thus generated is revealed to be both contaminated and opposed by cultural codes. Through portraits, photographs, and other less concrete representations of the human countenance, characters seek to take personal possession of both themselves and others and thereby gain a form of self-possession which places them in a certain relationship to the culture. In creating verbal constructions of images, the authors also pursue a goal mirroring that of their characters. Individual chapters specifically address the way in which the written work of art's identity is reflected in the characteristics of the visual art forms it represents; the power of the memorialized image of woman; and the imaginary strategies by which the cultural authority of one written text can be defused by the written Romance that appropriates it. Works discussed are: The House of the Seven Gables, The Wings of the Dove, The Sound and the Fury, and Song of Solomon and Beloved.
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Lee, Billy. "Aftereffects and the representation of stereoscopic surfaces". Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240637.
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Barrett, Douglas J. K. "Attention and the representation of objects in space". Thesis, University of Surrey, 2003. http://epubs.surrey.ac.uk/843518/.
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Visual information is processed by the brain in a large number of functional sites across a network of anatomically separate areas. In order to guide coherent behaviour, visual attention is required to select and integrate information regarding the spatial and perceptual attributes of separate objects from the numerous areas involved in their representation. The empirical work reported in this thesis investigates the role of spatial information in guiding this process and considers the different types of representation that may be involved. Using an experimental paradigm designed to disambiguate priming in egocentric and allocentric coordinates, the thesis contrasts the predictions of location and object-based models of attention across a series of experiments that manipulate the way attention is oriented to the location or identity of objects in the visual scene. Initial chapters investigate the distinction between exogenous and endogenous attention and its implication for the coordinate frame in which selection occurs. Subsequent chapters investigate the role of non-spatial attributes such as colour differentiation and grouping in determining the nature of spatial representation underlying shifts of attention as well as spatial-temporal constraints on object-based priming. The results across the thesis are inconsistent with the distinction imposed by space and object-based models of attention and instead support a more flexible account in which attentional mechanisms activate representations that combine non-spatial and spatial information about localised objects at a number of levels of spatial description.
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Cagenello, Ronald Bruce. "Perception and representation of stereoscopic slant and curvature". Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279809.
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Yang, Hyeunjin. "Personal stories to visual representation : ‘The stories of Zili’". Thesis, University of Kalmar, School of Communication and Design, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hik:diva-712.
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I represented a person’s stories and memories of childhood through the material called glass, and found a method to approach personal stories.
To do this, the medium to express my conception that is express of the personal experience and extreme situation on glass was based. The most significant point of study was realizing the nature of emotions and meanings within a person’s life. As well as special instruments and to analyze whether it is an appropriate expression.
Accordingly with this, I collected individual stories from Zili and tried to comprehensively understand the cause behind. For that I approached different cases of psychology theory to compare. After I analyzed the colour and object that relate to memories or the person. Expression of artefact I created from foundational theory through my perspective. I represented in magnification of memories as an expression on glass artefacts for respect of peoples diversity life.
This led me to make more concrete context in practical work and theoretical tool as well.
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Dent, Kevin. "Representation and capacity in visual-spatial short-term memory". Thesis, Lancaster University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.418879.
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Baker, Carole. "Imaging the animal : visual media representation within creative practice". Thesis, University of Sunderland, 2000. http://sure.sunderland.ac.uk/5251/.
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Zhang, Zongxiang. "Using graphical representation of user interfaces as visual references". Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/75630.
Texto completoResumen
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2012.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 129-133).
My thesis investigates using a graphical representation of user interfaces - screenshots - as a direct visual reference to support various kinds of applications. We have built several systems to demonstrate and validate this idea in domains like searching documentation, GUI automation and testing, and cross-device information migration. In particular, Sikuli Search enables users to search documentation using screenshots of GUI elements instead of keywords. Sikuli Script enables users to programmatically control GUIs without support from the underlying applications. Sikuli Test lets GUI developers and testers create test scripts without coding. Deep Shot introduces a framework and interaction techniques to migrate work states across heterogeneous devices in one action, taking a picture. We also discuss challenges inherent in screenshot-based interactions and propose potential solutions and directions of future research.
by Tsung-Hsiang Chang.
Ph.D.