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Exploring Human Perception: Spectral Composition and Wavelength Encoding

This article delves into human perception through the understanding of spectral composition and wavelength encoding. It covers key measurement tools like monochromators and spectroradiometers, the spectral power distribution of different light sources, and the role of photoreceptors such as rhodopsin in scotopic vision. The text also examines color matching techniques and the relationship between cone responsivity and color perception, highlighting important data in the context of rod and cone interactions. A comprehensive overview aimed at understanding color science.

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Exploring Human Perception: Spectral Composition and Wavelength Encoding

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Presentation Transcript

  1. Human Perception 4: Wavelenght Encoding

  2. Measuring the Spectral Composition • Newton’s summary drawing 4.2

  3. Measuring the Spectral Composition • Basic monochromator 4.3

  4. Prism Lens Lens Photodetector Point source Movable slit Measuring the Spectral Composition • A spectroradiometer 4.4

  5. Measuring the Spectral Composition • Spectral power distribution • (a) blue skylight • (b) a tungsten bulb 4.5

  6. Measuring the Spectral Composition • Superposition of light SPD 4.6

  7. Scotopic Wavelength Encoding • Rhodopsin • regenerated 4.7

  8. Scotopic Wavelength Encoding • Rhodopsin • bleached 4.8

  9. Rod Color Matching

  10. Example Data: Rod Matches

  11. Photopigment Absorptions

  12. Rhodopsin Absorption Curve

  13. Rhodopsin And OpticsPredicts Matches

  14. Cone Color Matching Experiment (a) (b)

  15. Metamers

  16. More Metamers

  17. Color Matching Superposition

  18. Standard CMFs (10 deg)

  19. Color Matching Equations Setting CIE RGB functions

  20. Cones and Color Matching (Roorda et al.) Cone inner segments have a diameter of roughly 1-2 micron in foveola and much larger in the periphery. Here (foveolar edge) they are about 3-4 microns (330 microns ~ 1 deg)

  21. Single Unit Cone Measurements

  22. Voltage Recordings From a Cone

  23. Cone Wavelength Responsivity

  24. Basic Color Equation Input SPD Response Sensor responsivity

  25. CMFs and Cone Responsivity

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