title: 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.
authors.affiliation: Electronics Engineering Department, Ewha W. University, Seoul, Korea. jiheehan87227@gmail.com
authors.forename: Ji-Hee
authors.initials: JH
authors.lastname: Han
authors.forename: Sejung
authors.initials: S
authors.lastname: Yang
authors.forename: Byung-Uk
authors.initials: BU
authors.lastname: Lee