Color Perception

Dimensions of Color:

• Hue:

 

• Brightness:

 

• Saturation:

 

 

 

Color Mixture:

Subtractive Color Mixture:

 

 

 

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e.g.

 

 

• Additive Color Mixture:

 

 

 

 

 

 

 

 

• complementary hues:

 

 

 

 

 

 

 

 

 

 

Trichromatic Theory of Color Vision: (Young-Helmholtz theory)

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• S-Cones:

• M-Cones:

• L-Cones:

 

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e.g. a 450 nm light

 

 

 

 

 

 

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e.g.

 

 

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• Color Blindness:

 

 

 

e.g.

protanopia -

 

 

deuteranopia -

 

 

Tritanopia -

 

 

 

• Trichromatic Theory can't explain all color phenomenon though

Opponent-Process Theory:

• 3 types

  • Red-Green:

  • Yellow-Blue:

  • Black-White:

 

 

 

 

 

 

 

• lateral inhibition creates the opponent process cells

 

 

 

Color Constancy:

Depth Perception:

absolute distance:

relative distance:

1. Monocular depth cues:

a. Linear Perspective

 

 

 

 

 

 

 

b. texture gradient

 

 

 

 

c. aerial perspective:

 

 

 

 

 

 

 

 

 

 

d. shadow/shading:

 

 

 

 

 

e. interposition (a.k.a. occlusion):

 

 

 

 

 

 

f. motion parallax

 

 

 

 

 

 

 

 

g. accretion and deletion

 

 

 

 

 

 

 

 

2. Binocular depth cues:

 

a. Stereopsis (a.k.a. binocular disparity):

 

 

 

 

e.g. stereograms & autostereograms

 

 

 

 

Oculomotor Depth Cues:

a.convergence:

 

 

 

 

 

b. accommodation:

 

 

 

 

 

3. Perception via Self Motion:

a. Optic Flow: