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Human Visual Systems and Perception C. Edward Chow
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mccchow2 Image in Human Eye
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mccchow3 Rod and Cone Cell Distribution
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mccchow4 Contrast Illusion
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mccchow5 Demystify Illusion with Mach Bend Effect
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mccchow6 Spatial Frequencies Image can be considered as superposition of gratings of different spatial frequencies (cycles/degree).
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mccchow7 Contrast Impact
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mccchow8 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 assumption= 60/(2*1.7’)~18 cycles/degree 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 assumption= 60/(2*1.7’)~18 cycles/degree
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mccchow9 Color Representation Three-Receptor Model
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mccchow10 Perception Representation
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mccchow11 Tristimulus Curves Devise a 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-x-y Devise a 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-x-y
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mccchow12 CIE {X,Y,Z} system CIE: Commission Internationale de I’Eclairage, The International commission on color standards) Figure 2.17b shows the corresponding amount of primaries needed to match all wavelengths of visible spectrum. CIE: Commission Internationale de I’Eclairage, The International commission on color standards) Figure 2.17b shows the corresponding amount of primaries needed to match all wavelengths of visible spectrum.
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mccchow13 1931 CIE Chromaticity Diagram
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mccchow14 Color Coordinate System Conversion
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mccchow15 Transformation from NTSC
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