Human Perception 4: Wavelenght Encoding.

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Presentation transcript:

Human Perception 4: Wavelenght Encoding

Measuring the Spectral Composition Newton’s summary drawing 4.2

Measuring the Spectral Composition Basic monochromator 4.3

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

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

Measuring the Spectral Composition Superposition of light SPD 4.6

Scotopic Wavelength Encoding Rhodopsin regenerated 4.7

Scotopic Wavelength Encoding Rhodopsin bleached 4.8

Rod Color Matching

Example Data: Rod Matches

Photopigment Absorptions

Rhodopsin Absorption Curve

Rhodopsin And Optics Predicts Matches

Cone Color Matching Experiment (b)

Metamers

More Metamers

Color Matching Superposition

Standard CMFs (10 deg)

Color Matching Equations Setting CIE RGB functions

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)

Single Unit Cone Measurements

Voltage Recordings From a Cone

Cone Wavelength Responsivity

Basic Color Equation Input SPD Response Sensor responsivity

CMFs and Cone Responsivity

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