DOI: 10.1109/iccase.2011.5997521
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Abstract: Image enhancement is used to improve quality of images for further analysis. In this paper, we proposed a color image enhancement method with the use of sparse representation of orthogonal transform based on the characteristics of discrete cosine transform (DCT) coefficients: fewer nonzero coefficients exist in smooth domains, the amplitudes of DCT change slightly in texture contents but significantly in edge. Nonlinearly reduces the impact of textures with the use of the threshold on DCT coefficients, and th…

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