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Unformatted text preview: o Rougher surface (matte surface) Refraction =wavefront retardation Visible light: 400 700 nm Three aspects of light important for vision o Intensity Luminance = physical quantity/measurement The amount of energy emitted or reflected by an extended light source Expressed in candelas per square meter 1 candela = the amount of light emitted by a single burning candle o Contrast A measure of the difference between the highest luminance and the lowest luminance in a scene, so it represents relative rather than absolute luminance. C=(L max L min )/(L max +L min ) The reflectance of a surface is the proportion of incident light that it reflects. Contrast in natural scenes depends on surface reflectance -- the contrast between a piece of coal and a sheet of paper is constant at different luminance levels. o Wavelength...
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- Fall '10