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4/28/20081Colorimage processing:fundamentalsSpring 2008ELEN 4304/5365 DIP1by Gleb V. Tcheslavski: [email protected]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);2Pseudocolor processingcolors are assigned to a particularSpring 2008ELEN 4304/5365 DIP22.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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4/28/20082Fundamentals of colorMechanisms of color processing by human brain are not completely understood. However, the physical nature of color can be formally expressed and modeled.Spring 2008ELEN 4304/5365 DIP31666: 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 colorParticular 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 wavelengthsSpring 2008ELEN 4304/5365 DIP4body 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…