00 - Human visual system overview

00 - Human visual system overview - T i t l e ECE 6397...

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4/28/2008 1 ECE 6397: Visual System: Physiology, Computation, and Methods T i t l e Prof. Valery Kalatsky Dept. of Electrical & Computer Engineering University of Houston Lecture XX We can only see the visible spectrum.
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4/28/2008 2 Visible Spectrum • The range of EMR visible to humans is also called “Light”. Th i ibl t l l bl th f EMR th t filt th h What is Light? •The visible spectrum closely resembles the range of EMR that filters through our atmosphere from the sun. • Other creatures see different ranges of visible light, for example bumble-bees can see ultraviolet light and dogs have a different response to colors than do humans. • The sky is blue because our atmosphere scatters light and the shorter wavelength blue gets scattered the most It appears that the entire sky is wavelength blue gets scattered the most. It appears that the entire sky is illuminated by a blue light but in fact that light is scattered from the sun. The longer wavelengths like red and orange move straight through the atmosphere which makes the sun look like a bright white ball containing all the colors of the visible spectrum.
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