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Human Visual Systems and Perception

Human Visual Systems and Perception. C. Edward Chow. Image in Human Eye. Rod and Cone Cell Distribution. Contrast Illusion . Demystify Illusion with Mach Bend Effect. Spatial Frequencies. Image can be considered as superposition of gratings of different spatial frequencies (cycles/degree).

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Human Visual Systems and Perception

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  1. Human Visual Systems and Perception C. Edward Chow

  2. Image in Human Eye chow

  3. Rod and Cone Cell Distribution chow

  4. Contrast Illusion chow

  5. Demystify Illusion with Mach Bend Effect chow

  6. Spatial Frequencies • Image can be considered as superposition of gratings of different spatial frequencies (cycles/degree). chow

  7. Contrast Impact chow

  8. 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 chow

  9. Color RepresentationThree-Receptor Model chow

  10. Perception Representation chow

  11. 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 chow

  12. 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. chow

  13. 1931 CIE Chromaticity Diagram chow

  14. Color Coordinate System Conversion chow

  15. Transformation from NTSC chow

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