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Thèses sur le sujet « Visual perception »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 25 juillet 2025

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1

Deplancke, Antoine. "Approche psychophysique des dissociations perception-action : effet de la détection de distracteurs au seuil sur l’atteinte de cibles visuelles." Thesis, Lille 3, 2012. http://www.theses.fr/2012LIL30033/document.

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La théorie dominante suggérant une séparation entre une vision consciente pour la perception et une vision non consciente pour l'action au sein du système visuel fut particulièrement discutée au cours des dernières décennies. La thèse défendue ici se positionne dans le cadre d'une approche alternative reposant sur une évaluation conjointe des réponses motrice et perceptive en présence de stimuli au seuil perceptif. Les travaux réalisés dans ce contexte ont initialement porté sur les temps de réaction et ont contribué au développement d'un modèle psychophysique postulant que les réponses percep

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2

Porporino, Mafalda. "Developmental differences in global and local perception : is global perception more attention demanding than local perception." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=30796.

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The primary purpose of the present study was to examine various aspects of local and global perception in groups of children and young adults with average ages of 6, 8, 10, 12, and 22 years. The aspects examined included developmental differences in RT for local and global visual information, the influence of filtering on global and local perception, and role of distracter congruency and compatibility on processing local and global stimuli. At a general level, the findings revealed that participants processed global faster than local stimuli. With the presence of distracters, 6 and 8-year-old

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3

Shin, Myoung Ju. "Visual orienting and conscious perception." Thesis, University of Auckland, 2012. http://hdl.handle.net/2292/19397.

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Much research supports the dichotomy model of visual covert orienting which suggests that attention shifting occurs either exogenously or endogenously. The present study attempts to suggest an alternative model that can accommodate evidence of endogenously cued orienting that may not necessarily involve consciousness. The first part of the present study (Experiment 1-3) examined whether or not the perceptual awareness of visual cue stimuli is essential in Posner��s cue-target orienting paradigm. Lowering the cue luminance had differential effects in orienting and cue identification task

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4

Michel, Rachel Keyes. "Visual perception, search, and attention." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/29580.

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5

Niall, Keith. "Projective invariance and visual perception." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75782.

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Six experiments tested the assumption that, in visual perception, observers have reliable and direct access to the equivalence of shapes in projective geometry (I call this "the invariance hypothesis in the theory of shape constancy"). This assumption has been made in the study of vision since Helmholtz's time. Two experiments tested recognition of the projective equivalence of planar shapes. In another four experiments, subjects estimated the apparent shape of a solid object from different perspectives. Departure from projective equivalence was assessed in each study by measuring the cross ra

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6

Chan, Y. M. "Depth perception in visual images." Thesis, University of Brighton, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380238.

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7

Sorensen, Robyn Elizabeth. "The perception of visual symmetry." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624479.

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8

Carlin, Patricia. "On symmetry in visual perception." Thesis, University of Stirling, 1996. http://hdl.handle.net/1893/1777.

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This thesis is concerned with the role of symmetry in low-level image segmentation. Early detection of local image properties that could indicate the presence of an object would be useful in segmentation, and it is proposed here that approximate bilateral symmetry, which is common to many natural and man made objects, is a candidate local property. To be useful in low-level image segmentation the representation of symmetry must be relatively robust to noise interference, and the symmetry must be detectable without prior knowledge of the location and orientation of the pattern axis. The experim

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9

RAHMAN, SHAHNUR. "Visual Perception in Autonomous Vehicles." Thesis, KTH, Hållbarhet och industriell dynamik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-189346.

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The human factor accounts for nine out of ten out of all traffic accidents, and because more vehicles are being deployed on the roads, the number of accidents will increase. Because of this, various automated functions have been implemented in vehicles in order to minimize the human factor in driving. In recent year, this development has accelerated and vehicles able to perform the complete driving task without any human assistance have begun to emerge from different projects around the world. However, the autonomous vehicle still has many barriers to overcome before safe driving in traffic be

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10

Genin, Terry. "Perception of the visual image." Thesis, University College London (University of London), 1987. http://discovery.ucl.ac.uk/10006547/.

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Many scholars tacitly or overtly support the position that the image is becoming the primary means of communication. It is therefore necessary to become visually 'literate' which propensity, it seems, is (unlike 'numeracy' and 'articulacy/literacy') partially innate. During early maturation a complicated set of interactions occur between the physical and psychological aspects of the observer, forming the visually perceptive individual. It is proposed in this thesis that an image comes about as the result of technological, historical, geographic and social forces, an understanding of which, it

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11

Wiesemann, Elizabeth Y. "The Visual Perception of Elasticity." TopSCHOLAR®, 2008. http://digitalcommons.wku.edu/theses/75.

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12

Wardle, Susan G. "Stereopsis in human visual perception." Thesis, The University of Sydney, 2012. https://hdl.handle.net/2123/28933.

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The perception of a three-dimensional world is a challenge for the visual system because the retinal image is only two-dimensional. Stereopsis is the ability to detect depth from small differences in perspective between each eye’s two—dimensional view. In this thesis I examine three aspects of stereoscopic vision in human observers using psychophysical methods. In part 1, the role of stereopsis in image segmentation and ”camouflage breaking” is investigated using a contrast masking paradigm. Binocular disparity is found to reduce contrast masking, and threshold elevation decreases mono

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13

Wilkie, Sonia. "Auditory manipulation of visual perception." Thesis, View thesis, 2008. http://handle.uws.edu.au:8081/1959.7/39802.

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Psychological research on cross-modal auditory-visual perception has focused predominantly on the manipulation of sensory information by visual information. There are relatively few studies of the way auditory stimuli may affect other sensory information. The Sound-induced Illusory Flash is one illusory paradigm that involves the auditory system biasing visual information. However, little is known about this cross-modal illusion. More research is needed into the structure of the illusion that investigates the different conditions under which the Sound induced Illusory Flash manifests and is en

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14

Wilkie, Sonia. "Auditory manipulation of visual perception." View thesis, 2008. http://handle.uws.edu.au:8081/1959.7/39802.

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Thesis (M.A. (Hons.))--University of Western Sydney, 2008.<br>Thesis accompanied by CD-ROM with demonstration of possible creative applications. A thesis presented to the University of Western Sydney, College of Arts, MARCS Auditory Laboratories, in fulfilment of the requirements for the degree of Master of Arts (Honours). Includes bibliographies. Thesis minus demonstration CD-ROM also available online at: http://handle.uws.edu.au:8081/1959.7/39849.

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15

Tamekue, Cyprien. "Controllability, Visual Illusions and Perception." Electronic Thesis or Diss., université Paris-Saclay, 2023. http://www.theses.fr/2023UPAST105.

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Cette thèse explore deux applications distinctes de la théorie du contrôle dans différents domaines scientifiques : la physique et les neurosciences. La première application se concentre sur la contrôlabilité nulle de l'équation parabolique associée à l'opérateur de Baouendi-Grushin sur la sphère de dimension 2. En revanche, la deuxième application concerne la description mathématique des illusions visuelles du type MacKay, et se focalise sur l'effet MacKay et les expériences psychophysiques de Billock et Tsou, via le contrôle de l'équation des champs neuronaux à une seule couche du type Amari

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16

Sanderson, Mariana Welly. "Effects of visual degradation on audio-visual speech perception." Thesis, Birkbeck (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404941.

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Audio-visual speech recognition is considered to be a dynamic process that uses auditory and complementary visual speech cues. These are the products of the stream of timed and targeted movements of the articulators in the vocal tract used to produce speech. If the visual aspect of speech is absent or degraded, speech recognition in noise may deteriorate; this was used as a tool to investigate the visual aspect of speech recognition in the following experiments. A series of shadowing and recall experiments assessed the effects of frame rate (temporal) and greyscale level (spatial) variations t

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17

Hunt, David Francis. "Perceptions and aversions : does disease avoidance influence tactile and visual perception?" Thesis, University of Bristol, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.752740.

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18

Hawes, Robin J. "Art and visual perception : what value do contemporary theories of visual perception have for art practice?" Thesis, Cardiff Metropolitan University, 2014. http://hdl.handle.net/10369/6524.

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19

Franz, Volker. "The relationship between visually guided motor behavior and visual perception." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=961452811.

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20

Sun, Li. "Integrated visual perception architecture for robotic clothes perception and manipulation." Thesis, University of Glasgow, 2016. http://theses.gla.ac.uk/7685/.

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This thesis proposes a generic visual perception architecture for robotic clothes perception and manipulation. This proposed architecture is fully integrated with a stereo vision system and a dual-arm robot and is able to perform a number of autonomous laundering tasks. Clothes perception and manipulation is a novel research topic in robotics and has experienced rapid development in recent years. Compared to the task of perceiving and manipulating rigid objects, clothes perception and manipulation poses a greater challenge. This can be attributed to two reasons: firstly, deformable clothing re

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21

Medwetz, Abigail. "The Effects of Color on Visual Perception and Visual Clutter." Kent State University Honors College / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ksuhonors1556373271322324.

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22

Storms, Russell L. "Auditory-visual cross-modal perception phenomena." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1998. http://handle.dtic.mil/100.2/ADA355474.

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Dissertation (Ph.D. in Computer Science) Naval Postgraduate School, September 1998.<br>Dissertation supervisor(s): Michael J. Zyda. "September 1998." Includes bibliographical references (p. 207-222). Also Available online.

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23

Kosti, Ronak. "Visual scene context in emotion perception." Doctoral thesis, Universitat Oberta de Catalunya, 2019. http://hdl.handle.net/10803/667808.

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Els estudis psicològics demostren que el context de l'escena, a més de l'expressió facial i la postura corporal, aporta informació important a la nostra percepció de les emocions de les persones. Tot i això, el processament del context per al reconeixement automàtic de les emocions no s'ha explorat a fons, en part per la manca de dades adequades. En aquesta tesi presentem EMOTIC, un conjunt de dades d'imatges de persones en situacions naturals i diferents anotades amb la seva aparent emoció. La base de dades EMOTIC combina dos tipus de representació d'emocions diferents: (1) un conjunt de 26 c

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24

Wålarö, Johannes. "Detecting visual plagiarism with perception hashing." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-166771.

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Classifying images and deciding algorithmically whether or not they are the same image is a complex problem in com-puter science. This report looks at using perceptual hashing in order to fingerprint images so that they may be matched to one and other. The results shows that threshold match-ing images can be done with good accuracy, while a zero distance match is not reliable in most scenarios. The con-clusion is that a hybrid approach that uses a more inclu-sive perception algorithm to filter out candidates for a more thorough algorithm might be a good choice.

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25

Kharbat, Mohd Fawzi. "Robust visual perception for unmanned vehicles." Thesis, Cranfield University, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521418.

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26

Choi, Changhyun. "Visual object perception in unstructured environments." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53003.

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As robotic systems move from well-controlled settings to increasingly unstructured environments, they are required to operate in highly dynamic and cluttered scenarios. Finding an object, estimating its pose, and tracking its pose over time within such scenarios are challenging problems. Although various approaches have been developed to tackle these problems, the scope of objects addressed and the robustness of solutions remain limited. In this thesis, we target a robust object perception using visual sensory information, which spans from the traditional monocular camera to the more recently

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27

Buchler, Daniela Martins. "Visual perception of the designed object." Thesis, Staffordshire University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442502.

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This investigation deals with the issue of visual perception of the designed object, which is relevant in the context of product differentiation particularly in the case where incremental style changes are made to the external shape design of the product. Such cases present a problem regarding the effectiveness of product differentiation, which this research claims is a matter of visual perception. The problem is that in order for product differentiation to be effective, the design changes must be perceptible. Perceptible differentiation is explained as a function of the physical change, i.e.

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28

Delicato, Louise Samantha. "Psychophysical studies of visual motion perception." Thesis, University of Nottingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394752.

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29

Gonzales, Maria Eunice Quilici. "A cognitive approach to visual perception." Thesis, University of Essex, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328824.

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30

Corradi, Tadeo. "Integrating visual and tactile robotic perception." Thesis, University of Bath, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.761005.

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The aim of this project is to enable robots to recognise objects and object categories by combining vision and touch. In this thesis, a novel inexpensive tactile sensor design is presented, together with a complete, probabilistic sensor-fusion model. The potential of the model is demonstrated in four areas: (i) Shape Recognition, here the sensor outperforms its most similar rival, (ii) Single-touch Object Recognition, where state-of-the-art results are produced, (iii) Visuo-tactile object recognition, demonstrating the benefits of multi-sensory object representations, and (iv) Object Classific

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31

Bosten, Jenny Marie. "Contrast and constancy in visual perception." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611601.

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32

MYERS, KYLE JEAN. "VISUAL PERCEPTION IN CORRELATED NOISE (MODELS)." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/188006.

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This dissertation concerns the ability of human observers to perform detection tasks in medical images that contain structured noise. We shall show that physical measures of image quality, such as signal-to-noise ratio (SNR), resolution, modulation transfer function (MTF), and contrast, do not accurately predict how well an observer can detect lesions in an image. We have found that for images with equal pixel SNR, humans can detect a low contrast object more readily in images that have a low-pass noise structure, as opposed to a high-pass noise structure. This finding is important in the comp

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Koh, Hwan Cui. "Visual perception in autism spectrum disorders." Thesis, University of Sheffield, 2009. http://etheses.whiterose.ac.uk/10348/.

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This thesis presents research conducted at the cognitive level, the neurophysiological level and the psycho-physical level, for examining vision in ASD. The psycho-physical findings suggest that atypical visual perception in ASD is unlikely to have a sub-cortical origin as sub-cortical magnocellular and parvocellular pathway functioning, and low/high spatial frequency detection in adolescents with ASD were found to be no different from typically-developing controls. There was, however, evidence indicating local motion direction perception deficits in the same adolescents with ASD suggesting th

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34

Shunmugam, Nagarajan. "Operational data extraction using visual perception." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-292216.

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The information era has led the manufacturer of trucks and logistics solution providers are inclined towards software as a service (SAAS) based solutions. With advancements in software technologies like artificial intelligence and deep learning, the domain of computer vision has achieved significant performance boosts that it competes with hardware based solutions. Firstly, data is collected from a large number of sensors which can increase production costs and carbon footprint in the environment. Secondly certain useful physical quantities/variables are impossible to measure or turns out to b

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35

Bayerl, Pierre. "A model of visual motion perception." [S.l. : s.n.], 2006. http://nbn-resolving.de/urn:nbn:de:bsz:289-vts-56293.

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36

Fu, Huan. "Robust Dense Prediction for Visual Perception." Thesis, The University of Sydney, 2019. http://hdl.handle.net/2123/20123.

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Dense prediction or pixel-level labeling targets at predicting labels of interest (e.g., categories, depth values, flow vectors, and edge probabilities) for each pixel of an input image. This middle-level computer vision problem plays a crucial role in establishing visual perception systems for the future intelligent world. Therefore, tremendous efforts have been made in the past decades to explore the solution for robust dense prediction, and recent studies have continuously obtained significant progress relying on deep Fully Convolutional Networks (FCNs). According to the expected label, den

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Serrano, Jose Gaston. "Visual perception of simulated conducting motions." Diss., The University of Arizona, 1993. http://hdl.handle.net/10150/186593.

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The purpose of this investigation was to examine subject response to music conducting motions simulated on a computer screen. Forty musicians and forty non-musicians responded to a point of light moving around a computer screen simulating the tip of a conductor's baton. Subjects were asked to press a button every time they perceived a beat portrayed in the motions. The timing of subject responses to four modes of motion was recorded and analyzed. In order to produce sound from their musical instruments, musicians must undergo a process that involves developing a mental image of the upcoming so

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38

Zamboni, Elisa. "Biases in perception of visual motion." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/43287/.

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Perceptual decision making refers to the process of making a choice among a series of options based on sensory information. Several studies have used visual stimuli to gain an understanding of the processes involved in encoding sensory information and its decoding, leading to a perceptual decision. One popular visual modality for studying these questions is motion and the ability to discriminate between axes of motion. Several mathematical models describing the processes of perceptual decision making have been proposed – many of them are based on data from electrophysiological experiments on m

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Nguyen, Duc Minh Chau. "Affordance learning for visual-semantic perception." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2021. https://ro.ecu.edu.au/theses/2443.

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Affordance Learning is linked to the study of interactions between robots and objects, including how robots perceive objects by scene understanding. This area has been popular in the Psychology, which has recently come to influence Computer Vision. In this way, Computer Vision has borrowed the concept of affordance from Psychology in order to develop Visual-Semantic recognition systems, and to develop the capabilities of robots to interact with objects, in particular. However, existing systems of Affordance Learning are still limited to detecting and segmenting object affordances, which is cal

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Boyle, Justin Robert. "Improving Perception From Electronic Visual Prostheses." Thesis, Queensland University of Technology, 2005. https://eprints.qut.edu.au/16106/1/Justin_Boyle_Thesis.pdf.

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This thesis explores methods for enhancing digital image-like sensations which might be similar to those experienced by blind users of electronic visual prostheses. Visual prostheses, otherwise referred to as artificial vision systems or bionic eyes, may operate at ultra low image quality and information levels as opposed to more common electronic displays such as televisions, for which our expectations of image quality are much higher. The scope of the research is limited to enhancement by digital image processing: that is, by manipulating the content of images presented to the user. The work

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Boyle, Justin Robert. "Improving Perception From Electronic Visual Prostheses." Queensland University of Technology, 2005. http://eprints.qut.edu.au/16106/.

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This thesis explores methods for enhancing digital image-like sensations which might be similar to those experienced by blind users of electronic visual prostheses. Visual prostheses, otherwise referred to as artificial vision systems or bionic eyes, may operate at ultra low image quality and information levels as opposed to more common electronic displays such as televisions, for which our expectations of image quality are much higher. The scope of the research is limited to enhancement by digital image processing: that is, by manipulating the content of images presented to the user. The work

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Kanizsar, Orsolya. "Visual Cognition In Dogs. Motion Perception." Doctoral thesis, Università degli studi di Padova, 2017. http://hdl.handle.net/11577/3421837.

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In the last decades several studies have been investigated the behavior and cognition of dogs (Canis familiars) especially from socio-cognitive aspects. We already gained a solid knowledge on how dogs communicate with humans and conspecific partners, how they are able recognize, interpret and rely on social-communicational cues in their everyday lives, thus continuously perceiving a flow of visual information. However, the fundaments of how they process these visual information are still missing from the literature. The current PhD project have been developed around three independent studies,

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Ngo, Mary Kim. "Facilitating visual target identification using non-visual cues." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:6e05bfc4-f049-43a3-8ecc-4db38f8cbb09.

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The research presented in this thesis was designed to investigate whether and how the temporal synchrony and spatial congruence of non-visual cues with visual targets could work together to improve the discrimination and identification of visual targets in neurologically-healthy adult humans. The speed and accuracy of participants’ responses were compared following the presence or absence of temporally synchronous and/or spatially congruent or incongruent auditory, vibrotactile, and audiotactile cues in the context of dynamic visual search and rapidly-masked visual target identification. The u

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Hu, Gang. "Effect of visual and non-visual cues in the generation of reorientation illusions." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0020/MQ56182.pdf.

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Becker, Mark W. "Volatile visual representations : the information represented while viewing visual scenes /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2000. http://wwwlib.umi.com/cr/ucsd/fullcit?p9992379.

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46

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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de, Haas B. "Contextual modulations of visual perception and visual cortex activity in humans." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1435556/.

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Visual perception and neural processing depend on more than retinal stimulation alone. They are modulated by contextual factors like cross-modal input, the current focus of attention or previous experience. In this thesis I investigate ways in which these factors affect vision. A first series of experiments investigates how co-occurring sounds modulate vision, with an emphasis on temporal aspects of visual processing. In three behavioral experiments I find that participants are unable to ignore the duration of co-occurring sounds when giving visual duration judgments. Furthermore, prolonged so

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Likens, Aaron D. "Hysteresis in visual search /." Read thesis online, 2010. http://library.uco.edu/UCOthesis/LikensAD2010.pdf.

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49

Griffiths, Shaaron S., and shaaron griffiths@deakin edu au. "Spatial and temporal disparaties in aurally aided visual search." Deakin University. School of Psychology, 2001. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20061207.134032.

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Research over the last decade has shown that auditorily cuing the location of visual targets reduces the time taken to locate and identify targets for both free-field and virtually presented sounds. The first study conducted for this thesis confirmed these findings over an extensive region of free-field space. However, the number of sound locations that are measured and stored in the data library of most 3-D audio spatial systems is limited, so that there is often a discrepancy in position between the cued and physical location of the target. Sampling limitations in the systems also produce

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Kim, Sujin. "Serial dependence in higher-level visual processing." Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/25395.

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Visual perception is not always veridical from moment to moment and can be biased by the recent history of visual input: a phenomenon called serial dependence. In this thesis, I present three studies that add to the further understanding of serial dependence, particularly in relation to higher-level visual processing. Study 1 tested whether aesthetic judgments of various artworks are subject to serial dependence. The task was to rate the attractiveness of serially presented paintings. The results indicate that attractiveness ratings of artworks are positively biased toward the recent past. In

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