06-1 - Color image processing

06-1 - Color image processing - Color image processing...

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4/28/2008 1 C o l o r image processing: fundamentals Spring 2008 ELEN 4304/5365 DIP 1 by Gleb V. Tcheslavski: [email protected] http://ee.lamar.edu/gleb/dip/index.htm Preliminaries Color image processing is motivated by two main factors: 1. Color is a powerful descriptor simplifying object recognition. 2. We can distinquish between thousands of color shades and intensities, compared to about 20-30 values of gray. There are two major areas of color image processing: 1. Full-color processing – images are acquired with a full-color sensor (TV camera, color scanner); 2 Pseudocolor processing colors are assigned to a particular Spring 2008 ELEN 4304/5365 DIP 2 2. Pseudocolor processing – colors are assigned to a particular monochrome intensity or intensity range. Many methods discussed for processing of monochrome images are applicable to color images; other methods need reformulation.
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4/28/2008 2 Fundamentals of color Mechanisms of color processing by human brain are not completely understood. However, the physical nature of color can be formally expressed and modeled. Spring 2008 ELEN 4304/5365 DIP 3 1666: Sir Isaac Newton managed to pass a beam of white light through a glass prism and got a rainbow on the other side where each color blends smoothly into the next. Fundamentals of color Particular colors of the object as human perceive them are determined by the nature of light reflection properties of the object. A body reflecting light that is balanced in all visible wavelengths Spring 2008 ELEN 4304/5365 DIP 4 body reflecting light that is balanced in all visible wavelengths appears as white. A body reflecting more light in a particular range of wavelengths and absorbing light in other bands appears as colored. Note : creatures other than humans may (and do!) perceive colors in a completely different way than we do…
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