DIGITAL COLOR IMAGE PROCESSING METHOD EMPLOYING HISTOGRAM NORMALIZATION FOR TONE AND COLOR REPRODUCTION

摘要

A digital color image processing of generating color reproduction functions by normalizing samples of color values ​​of the image, and processing the color components of the color digital image by applying the functions chromatic reproduction to the respective color components of the digital image. The color components are selected from the digital image by operating on a luminance component of the digital color image using a detail detection operator image to detect regions of the image representing luminance detail, and processing the color components of the digital image in the luminance detail region with a contrast detection filter to detect the contrast of the color components of the image in the details of parts of luminance. The color values ​​in said regions are divided into contrast intervals and forming histograms in the contrast intervals. One of the contrast intervals is selected based on the form of analogies histograms of color values ​​in the contrast interval. The color reproduction functions are derived by normalizing the histograms in the selected contrast interval.