ece542-9 - ECE 542-9 Digital Image Processing 6- Color...

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1 ECE 542-9 Digital Image Processing 6- Color Image Processing Dr. Z. Aliyazicioglu Cal Poly Pomona Electrical & Computer Engineering 1 Cal Poly Pomona Electrical & Computer Engineering Office 9-143 Color Fundamentals Color image processing divided into two major areas Full color : Images are used full color sensor, color scanner Pseudo color : assigning a color to a particular monochrome intensity or range of intensity Chromatic light spans the electromagnetic spectrum in 400 and 700nm Three basic quantities to describe the quality of chromatic: Radiance : The total amount of energy that flows from the light source [watts] ECE 542 - 9 2 Cal Poly Pomona Luminance : The measure of the amount of energy an observer perceives from the light source Brightness : express chromatic notion of intensity
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2 Color Fundamentals Primary and secondary colors of light and pigments ECE 542 - 9 3 Cal Poly Pomona Color Models The most commonly used models: RGB (red, green, blue): The hardware oriented model. (color monitor, video camera) blue=435.8 nm, green=546.1 nm, red = 600nm CMY (cyan, magenta, yellow) and CMYK (cyan, magenta, yellow, black) for color printing ECE 542 - 9 4 Cal Poly Pomona HIS (hue, saturation, intensity): has color and gray-scale information in the image
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3 The RGB Color Model Each color appears in its primary spectral components The model is based on a Cartesian coordinate system. RGB values are at the three corners; Cyan, magenta, and yellow are at three other corners Black is at the origin White is at the farthest from the origin ECE 542 - 9 5 Cal Poly Pomona The gray scale extends from black to white along the line joining these two points The RGB Color Model Image representation in RGB model use three components, one for each primary color. The number of bits used to represent each pixel in RGB space is called the pixel depth. Consider an RGB image that each color has 8 bits, the pixel depth is 24 bits. The total number of color in 24 bit RGB image is 2 24 =16,777,216. 8 ECE 542 - 9 6 Cal Poly Pomona Each color has 2 =256 color level
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4 The RGB Color Model Generating RGB image of the cross-sectional color plane (127,G,B) Three hidden surface planes in the color cube ECE 542 - 9 7 Cal Poly Pomona The RGB Color Model Many system is used today are limited to 256 colors This subset of colors is called the set of safe RGB colors or on internet Safe web color . 216 colors are common to most system ECE 542 - 9 8 Cal Poly Pomona Each color in RGB model can have 0,51,102,153,204,and 255 levels
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5 The CMY and CMYK Color Models Cyan, magenta, and yellow are the secondary colors of light the primary colors.
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This note was uploaded on 10/24/2010 for the course ECE 542 taught by Professor Zeki during the Spring '10 term at Cal Poly Pomona.

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ece542-9 - ECE 542-9 Digital Image Processing 6- Color...

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