| 摘要 |
PROBLEM TO BE SOLVED: To provide a digital color image processing method for maintaining relations of channel information in a pixel level while using more data from individual color channel histograms. SOLUTION: A method for adjusting the tone scale reproduction of a color image composed of pixels in a plurality of color channels is based on generating a reference image from a combination of values of pixels in the color channels, whereby each spatial coordinate of the reference image is characterized by a reference image level. Channel averages of the color channel values of the pixels that correspond to difference valued reference image levels are generated. A channel tone scale transformation is formed by relating at least one channel average to its corresponding reference image level, and the channel tone scale transformation is utilized on a pixel by pixel basis in the respective channels of the digital color image to produce a processed digital color image having improved tone scale reproduction. COPYRIGHT: (C)2004,JPO
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