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A Novel 3-D Color Histogram Equalization Method With Uniform 1-D Gray Scale Histogram

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3 Author(s)
Ji-Hee Han ; Electron. Eng. Dept., Ewha W. Univ., Seoul, South Korea ; Sejung Yang ; Byung-Uk Lee

The majority of color histogram equalization methods do not yield uniform histogram in gray scale. After converting a color histogram equalized image into gray scale, the contrast of the converted image is worse than that of an 1-D gray scale histogram equalized image. We propose a novel 3-D color histogram equalization method that produces uniform distribution in gray scale histogram by defining a new cumulative probability density function in 3-D color space. Test results with natural and synthetic images are presented to compare and analyze various color histogram equalization algorithms based upon 3-D color histograms. We also present theoretical analysis for nonideal performance of existing methods.

Published in:

Image Processing, IEEE Transactions on  (Volume:20 ,  Issue: 2 )