UT CS 384G - Vision and color (41 pages)

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Vision and color



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Vision and color

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Pages:
41
School:
University of Texas at Austin
Course:
Cs 384g - Computer Graphics
Computer Graphics Documents

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Vision and color University of Texas at Austin CS384G Computer Graphics Fall 2008 Don Fussell Reading Glassner Principles of Digital Image Synthesis pp 5 32 Watt Chapter 15 Brian Wandell Foundations of Vision Sinauer Associates Sunderland MA pp 45 50 and 69 97 1995 University of Texas at Austin CS384G Computer Graphics Fall 2008 Don Fussell 2 Optics The human eye employs a lens to focus light To quantify lens properties we ll need some terms from optics the study of sight and the behavior of light Focal point the point where parallel rays converge when passing through a lens Focal length the distance from the lens to the focal point Diopter the reciprocal of the focal length measured in meters Example A lens with a power of 10D has a focal length of 0 1m University of Texas at Austin CS384G Computer Graphics Fall 2008 Don Fussell 3 Optics cont d By tracing rays through a lens we can generally tell where an object point will be focused to an image point This construction leads to the Gaussian lens formula 1 1 1 d o di f Q Given these three parameters how does the human eye keep the world in focus University of Texas at Austin CS384G Computer Graphics Fall 2008 Don Fussell 4 Structure of the eye Physiology of the human eye Glassner 1 1 The most important structural elements of the eye are Cornea a clear coating over the front of the eye Protects eye against physical damage Provides initial focusing 40D Iris Colored annulus with radial muscles Pupil The hole whose size is controlled by the iris University of Texas at Austin CS384G Computer Graphics Fall 2008 Don Fussell 5 Structure of the eye cont Physiology of the human eye Glassner 1 1 Crystalline lens controls the focal distance Power ranges from 10 to 30D in a child Power and range reduces with age Ciliary body The muscles that compress the sides of the lens controlling its power Q As an object moves closer do the ciliary muscles contract or relax to keep the object in focus University of Texas at Austin CS384G



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