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

Ji-Hee Han, Sejung Yang, Byung-Uk Lee
2011 IEEE Transactions on Image Processing  
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
more » ... ith 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. Index Terms-Color image enhancement, gray scale histogram equalization, 3-D color histogram equalization.
doi:10.1109/tip.2010.2068555 pmid:20801744 fatcat:4l3ifwykfneutde5ljfvfu7q24