期刊名称：International Journal of Computer Science & Information Technology (IJCSIT)
印刷版ISSN：0975-4660
电子版ISSN：0975-3826
出版年度：2012
卷号：4
期号：5
页码：243
出版社：Academy & Industry Research Collaboration Center (AIRCC)
摘要：In this work, we formalize a generic fast hue-preserving histogram equalization method based on the RGBcolor space for image contrast enhancement and two versions of that generic process. The first methodestimates a RGB 3D histogram to be equalized using R-red, G-green, and B-blue 1D histograms, while thesecond method employs RG, RB, and GB 2D histograms. The histogram equalization is performed usingshift hue-preserving transformations, avoiding unrealistic colors. Our methods have linear time and spacecomplexities with respect to the size of the image and do not need to apply conversions from a color spaceto another in order to perform the image enhancement. Such design complies with real-time applicationsrequirements. An objective assessment comparing our methods and others is performed using a contrastmeasure and a color image quality measure, where the quality is established as a weighting of thenaturalness and colorfulness indexes. We analyze 300 images from the dataset of the University ofBerkeley. Experiments show that the value of the image contrast produced by our methods is in average50% greater than the original image value, keeping the quality of the produced images close to the originalone
关键词：Histogram equalization; contrast enhancement; hue-preserving; color image; RGB color space.
