EECE253_04_ColorPerception

EECE253_04_ColorPerception - EECE/CS 253 Image Processing...

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Unformatted text preview: EECE/CS 253 Image Processing Richard Alan Peters II Department of Electrical Engineering and Computer Science Fall Semester 2011 Lecture Notes: Richard Alan Peters II Department of Electrical Engineering and Computer Science Fall Semester 2011 Lecture Notes on Color Perception This work is licensed under the Creative Commons Attribution-Noncommercial 2.5 License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc/2.5/ or send a letter to Creative Commons, 543 Howard Street, 5th Floor, San Francisco, California, 94105, USA. . . . . 12/06/11 2 1999-2011 by Richard Alan Peters II Color Images Are constructed from three intensity maps. Each intensity map is projected through a color filter ( e.g., red, green, or blue, or cyan, magenta, or yellow) to create a single color image. The intensity maps are overlaid to create a color image. Each pixel in a color image is a three element vector. 12/06/11 3 1999-2011 by Richard Alan Peters II Color Images on a CRT or LCD Display Color Images on a CRT or LCD Display Intensity images are projected through dot- array color filters which are slightly offset from one another. Intensity images are projected through dot- array color filters which are slightly offset from one another. Projected image primary colors: red, green, and blue. 12/06/11 4 1999-2011 by Richard Alan Peters II Color Images on a CRT or LCD Display Color Images on a CRT or LCD Display Photographs of various displays, showing various pixel geometries. Clockwise from top left, a standard definition CRT television, a CRT computer monitor, a laptop LCD, and the OLPC XO-1 LCD display. [Peter Halasz (user:Pengo), Wikipedia, http://en.wikipedia.org/wiki/Pixel_geometry ] 12/06/11 5 1999-2011 by Richard Alan Peters II Color Images In Print Images are separated into four color bands, each of which is printed as a grid regularly spaced dots. A dots diameter varies in proportion to the intensity of the color. Images are separated into four color bands, each of which is printed as a grid regularly spaced dots. A dots diameter varies in proportion to the intensity of the color. 12/06/11 6 1999-2011 by Richard Alan Peters II Color Images in Print Color Images in Print The four colors are magenta, cyan, yellow, and black The four colors are magenta, cyan, yellow, and black 12/06/11 7 1999-2011 by Richard Alan Peters II Standard Halftone Screen Angles Cyan: 105 Yellow: 90 Magenta: 75 Black: 45 The dot grids are created with a screen that overlays the intensity images....
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This note was uploaded on 12/06/2011 for the course EECE 253 taught by Professor Alanpeters during the Summer '07 term at Vanderbilt.

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EECE253_04_ColorPerception - EECE/CS 253 Image Processing...

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