A novel 3-D color histogram equalization method with uniform 1-D gray scale histogram.
basic_science · Level V
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- Record sourced from PubMed, PMID 20801744.
- Also identified by DOI 10.1109/TIP.2010.2068555.
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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.