A Novel 3-D Color Histogram Equalization Method with Uniform 1-D Gray Scale Histogram
Abstract
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.
- Publication:
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IEEE Transactions on Image Processing
- Pub Date:
- February 2011
- DOI:
- Bibcode:
- 2011ITIP...20..506H
- Keywords:
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- Color image enhancement;
- gray scale histogram equalization;
- 3-D color histogram equalization