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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
71

Modeling the self-organization of color selectivity in the visual cortex

De Paula, Judah Ben, 1978- 28 August 2008 (has links)
How does the visual cortex represent and process color? Experimental evidence from macaque monkey suggests that cells selective for color are organized into small, spatially separated blobs in V1, and stripes in V2. This organization is strikingly different from that of orientation and ocular dominance maps, which consist of large, spatially contiguous patterns. In this dissertation, a self-organizing model of the early visual cortex is constructed using natural color image input. The modeled V1 develops realistic color-selective receptive fields, ocular dominance stripes, orientation maps, and color-selective regions, while the modeled V2 also creates realistic colorselective and orientation-selective neurons. V1 color-selective regions are generally located in the center of ocular dominance stripes as they are in biological maps; the model predicts that color-selective regions become more widespread in both cortical regions when the amount of color in the training images is increased. The model also predicts that in V1 there are three types of color-selective regions (red-selective, greenselective, and blue-selective), and that a unique cortical activation pattern exists for each of the HSV colors. In both V1 and V2, when regions of different color-selectivity are located nearby, bands of color form with gradually changing color preferences. The model also develops lateral connections between cells that are selective for similar orientations, matching previous experimental results, and predicts that cells selective for color primarily connect to other cells with similar chromatic preferences. Thus the model replicates the known data on the organization of color preferences in V1 and V2, provides a detailed explanation for how this structure develops and functions, and leads to concrete predictions to test in future experiments.
72

Image retrieval system based on texture and chromatic features

陳淸儀, Chan, Ching-yi. January 2000 (has links)
published_or_final_version / Computer Science and Information Systems / Master / Master of Philosophy
73

Tests for color discrimination and spectral sensitivity in the bottlenosed dolphin, Tursiops truncatus

Madsen, Carolyn January 1976 (has links)
Typescript. / Thesis (Ph. D.)--University of Hawaii at Manoa, 1976. / Bibliography: leaves 113-121. / Microfiche. / vii, 121 leaves ill. 29 cm
74

Visual determination of color differences using Probit analysis : phase II /

Reniff, Lisa. January 1989 (has links)
Thesis (M.S.)--Rochester Institute of Technology, 1989. / "References": leaves 61-63.
75

Infra-red vision in ferrets (Mustela furo)

Newbold, Haylie Goldene. January 2007 (has links)
Thesis (M.Sc. Biology)--University of Waikato, 2007. / Title from PDF cover (viewed March 19, 2008) Includes bibliographical references (p. 138-150)
76

The effect of sequential exposure of colour conditions on rate and accuracy of graphic symbol location

Kolatsis, Anna. January 2008 (has links)
Thesis (M.(Augmentative and Alternative Communication))--University of Pretoria, 2008. / Includes bibliographical references.
77

Determination of image quality for added noise as a function of spatial frequency /

Kuo, Yun-Ching. January 1989 (has links)
Thesis (M.S.)--Rochester Institute of Technology, 1989. / Includes bibliographical references (leaves 123-125).
78

A photometric study of the perception of object color

Henneman, Richard Hubard, January 1935 (has links)
Issued also as Thesis (Ph. D.)--Columbia University. / Bibliography: p. 86-88.
79

Teaching color discrimination to a severely developmentally disabled adult male

Erchak, Andrea G., January 1976 (has links)
Thesis--Wisconsin. / Includes bibliographical references (leaves 29-30).
80

Teaching color discrimination to mentally retarded adults a comparison of mechanical and nonchemical presentation methods /

Bernstein, Gail S., January 1975 (has links)
Thesis (M.S.)--University of Wisconsin--Madison, 1975. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

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