ECE468_25 - ECE 468: Digital Image Processing Lecture 24...

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ECE 468: Digital Image Processing Lecture 24 Prof. Sinisa Todorovic sinisa@eecs.oregonstate.edu 1
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Outline Color models (Textbook 6.2) Color transformations (Textbook 6.5) 2
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Visible Spectrum of EM 3
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Based on Psychophysical Studies Cones in the human eye red (R) 65% green (G) 33% blue (B) 2% R = 700nm G = 546.1nm B = 435.8nm Color = combination of primary colors R, G, B 4
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CRT vs. LCD Cathode ray tube (CRT): Triads of red, green, blue electron-sensitive phosphor dots “Adding” of electron-gun rays, 30 frames/sec Liquid crystal dislpays (LCD), Active matrix technology (AMT), Plasma 3 red, green, blue subpixels forming a pixel LCD - polarized light AMT - thin Flm transistors Plasma - tiny gas cells coated with phosphor 5
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Basic Color Characteristics Brightness = achromatic intensity Hue = dominant wavelength as perceived by an observer Saturation = relative purity of hue vs. white light 6
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Chromaticity Diagram x = red y = green z = 1 - x - y Color composition as a function of 7
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Gamut = Range of Colors 8
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Color Model = Color System = Color Space Purpose: To facilitate speciFcation of colors RGB color model 9
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24-bit RGB image (2 8 ) 3 = 16777216 10
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Generating the RGB Image 11
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CMY System C M Y = 1 1 1 - R G B 12
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ECE468_25 - ECE 468: Digital Image Processing Lecture 24...

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