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Blocking Artifacts Reduction in Compressed Data

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Executive Summary

Blocking artifacts are significant problem in DCT-based image compression, which introduce the apparent distortion of visual quality. In this paper, an effective blocking artifacts deduction method is proposed. Firstly, the edges identification is done in compressed data, with hysteretic based edge linkage. Secondly, according to DCT coefficients distribution in the half-block-size shifted image block and also in the original target image blocks, an adaptively compound method is carried out to reduce the blocking effects. Since all the computation is performed in DCT domain, the compressibility of the original image is not affected. Furthermore, experiment results verified the effectiveness of the authors' new method.

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