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Color in an image is resolved into 3 or 4 color components and 2-Dimages ofthese components are stored in separate channels. Most of the color imageenhancement algorithms are applied channel-by-channel on each image. But such asystem of color image processing is not processing the original color. When acolor image is represented as a quaternion image, processing is done inoriginal colors. This paper proposes an implementation of the quaternionapproach of enhancement algorithm for enhancing color images and is referred asthe modified alpha-rooting by the two-dimensional quaternion discrete Fouriertransform (2-D QDFT). Enhancement results of this proposed method are comparedwith the channel-by-channel image enhancement by the 2-D DFT. Enhancements incolor images are quantitatively measured by the color enhancement measureestimation (CEME), which allows for selecting optimum parameters for processingby the genetic algorithm. Enhancement of color images by the quaternion basedmethod allows for obtaining images which are closer to the genuinerepresentation of the real original color.

Modified Alpha-Rooting Color Image Enhancement Method On The Two-Side  2-D Quaternion Discrete Fourier Transform And The 2-D Discrete Fourier  Transform