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An Adaptive Image Enhancement of the DCT Compressed Image using the Spatial Frequency Property  

Jeon, Seon-Dong (금오공과대학교 전자공학과)
Kim, Sang-Hee (금오공과대학교 전자공학과)
Publication Information
Journal of the Institute of Convergence Signal Processing / v.11, no.2, 2010 , pp. 104-111 More about this Journal
Abstract
This paper presents an adaptive image enhancement method using the spatial frequency property in the DCT(discrete cosine transform) compressed domain. The dc coefficients, the illumination components of image, are adjusted to compress the dynamic range of image, and the ac coefficients are modified to enhance the contrast by using the human visual system(HVS) and the spatial frequency property. The ac coefficients are separated into vertical direction, horizontal direction, and mixed spatial frequency components, and adaptively modified to minimize the block artifacts that possibly occur in the image enhancement. The proposed method using dynamic range compression and adaptive contrast enhancement shows the advanced performance without the block artifact compared with existing method.
Keywords
Image Enhancement; DCT; Compression Domain; Contrast Measure; Retinex Theory;
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