06-2 - Color image processing

06-2 - Color image processing - Color image processing...

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4/28/2008 1 C o l o r image processing: pseudocolor processing Spring 2008 ELEN 4304/5365 DIP 1 by Gleb V. Tcheslavski: [email protected] http://ee.lamar.edu/gleb/dip/index.htm Preliminaries Pseudocolor (false color) image processing consists of assigning colors to gray values based on a specified criterion. The term “pseudocolor” emphasizes that the colors were assigned artificially opposing to the true (real) colors. The principal use of pseudocolors is for human i l i t i dit tt i f l dti l Spring 2008 ELEN 4304/5365 DIP 2 visualization and interpretation of gray scale details on an image or their sequence.
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4/28/2008 2 Intensity slicing The technique of intensity ( density ) slicing can be explained by interpreting a grayscale image as a 3D function being sliced by a plane parallel to the coordinate plane of the image. For instance, a plane at l i slices the image into two levels. Assigning next one color to the pixels, whose intensities are above the plane and another color to the pixels whose Spring 2008 ELEN 4304/5365 DIP 3 color to the pixels, whose intensities are below the plane (pixels are on different sides of the plane), we create a two-color image, whose appearance depends on pixel intensities. Intensity slicing Alternatively, the same mapping can be interpreted using the following representation. Any input intensity level is assigned to one of two colors, depending on whether it is above or below the value of l i . When more levels are Spring 2008 ELEN 4304/5365 DIP 4 used, the mapping function looks like stairs.
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4/28/2008 3 Intensity slicing In general, this technique is as follows: Supposing that the image has the gray scale values [0, L-1] where the level l 0 represents black [f(x,y) = 0] and the level l L-1 represents white, we form P planes perpendicular to the intensity axes at levels l 1 , l 2 ,..., l P such that 0 < P < L -1 and the planes partition the gray scale into P + 1 intervals V 1 , V 2 ,…, V P+1 . Then, intensity to color
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06-2 - Color image processing - Color image processing...

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