00 - Human visual system overview

00 - Human visual system overview - 4/28/2008 T i t l e ECE...

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4/28/2008 1 ECE 6397: Visual System: Physiology, Computation, and Methods T i t l e Prof. Valery Kalatsky 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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4/28/2008 3 Human Visual System The Eye: iris and pupil The eye can be compared to a TV camera attached to an automatically tracking tripod a machine that is self-focusing, adjusts automatically for light intensity adjusts automatically for light intensity, has a self-cleaning lens, and feeds into a computer with parallel-processing capabilities The colored part of the eye, the iris, controls light levels inside the eye. The round opening in the center of the iris is called the pupil. The iris is embedded with tiny muscles that dilate and constrict the pupil size. Range of pupil diameters 1 – 8 mm
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4/28/2008 4 Cornea The cornea is the transparent, dome-shaped window covering the front of the eye. It is a powerful refracting surface, providing 2/3 of the eye's focusing power. Index of refraction 1 376 Optical power 43 diopters Index of refraction 1.376. Optical power 43 diopters. There are no blood vessels in the cornea, it is normally clear and has a
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This note was uploaded on 12/08/2010 for the course ELEN 4304 taught by Professor Staff during the Spring '08 term at Lamar University.

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00 - Human visual system overview - 4/28/2008 T i t l e ECE...

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