Visual Human Systems and Perception
C. Edward Chow
Image in Human Eye
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Rod and Cone Cell Distribution
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Contrast Illusion
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Demystify Illusion with Mach Bend Effect
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Spatial Frequencies
Image can be considered as superposition of gratings of different spatial frequencies (cycles/degree).
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Contrast Impact
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Visual Acuity
Visual acuity: the smallest angular separation at which the individual lines can be distinguished. Depend on contrast ratio and keenness of your eyes. 1.7 is normal mcc assumption=
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Color Representation Three-Receptor Model
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Perception Representation
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Tristimulus a Curves
Devise system with simple numbers to represents all colors. (How about all positive numbers?) x,y,z are proportion of X primary, Y primary, Z primary (supersaturated red, green and blue) x=X/(X+Y+Z); y=Y /(X+Y+Z); z=1-xy
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CIE {X,Y,Z} system
CIE: Commission Internationale de IEclairage, The International commission on color standards...