Abbreviated Journal Title
J. Electron. Imaging
MODEL; Engineering, Electrical & Electronic; Optics; Imaging Science &; Photographic Technology
Histogram equalization and specification have been widely used to enhance information in a gray scale image, with histogram specification having the advantage of allowing the output histogram to be specified as compared to histogram equalization, which attempts to produce an output histogram that is uniform Unfortunately, expanding histogram techniques to color images is not very straightforward Since humans are sensitive to chromatic changes, care must be taken to ensure that incorrect colors are not produced. Additionally expanding the one-dimensional histogram used in gray level histogram techniques to a joint histogram (usually of three variables representing the primary colors of red, green, and blue) can yield specified histograms which have no physical meaning, hence making if difficult to determine the set of histograms required for a desired enhancement in this paper, we describe a method of extending gray level histogram specification to color images by performing histogram specification an the luminance, saturation, and hue components in the color difference C-Y color space. These methods take into account the relationship between the luminance and saturation components while yielding specified histograms that produce natural-looking results. (C) 1999 SPIE and IS&T. [S1017-9909(99)00303-7].
Journal of Electronic Imaging
Weeks, A. R.; Sartor, L. J.; and Myler, H. R., "Histogram specification of 24-bit color images in the color difference (C-Y) color space" (1999). Faculty Bibliography 1990s. 2889.