Yan Liu


This thesis presents a physiological hypothesis of a systematic negative feedback control mechanism of the human visual system and a corresponding systematic color vision model. This model is based on the physiological hypothesis of systematic negative-feedback control of the visual system and both the stage color vision theory and Land's theory. According to this systematic color vision model, the color vision is processed as described by the stage theory, the negative feedback of the visual system adjusts the sensitivities of the cone photoreceptors and controls the visual system to adapt to the visual surroundings . The dynamic ranges of relative visual signals are always from 0 through 100, just as stated by the Retinex theory. New terms, color vision excitation, visual reference point, and color vector are introduced for describing the color vision process. This systematic color vision model can combine physiological quantitative data and psychophysical quantitative data by the systematic color equations. This thesis also presents a quantitative control model of the visual system.

Library of Congress Subject Headings

Color vision

Publication Date


Document Type


Department, Program, or Center

Chester F. Carlson Center for Imaging Science (COS)


Berns, Roy

Advisor/Committee Member

Fairchild, Mark


Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works. Physical copy available through RIT's The Wallace Library at: QP483.L58 1991


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