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Novel artifact removal algorithm in the discrete cosine transform domain

[+] Author Affiliations
Ying-Wen Chang

ChungChou Institute of Technology, Department of Information Management, Taiwan

Yen-Yu Chen

ChungChou Institute of Technology, Department of Information Management, Taiwan

J. Electron. Imaging. 17(1), 013012 (March 13, 2008). doi:10.1117/1.2892682
History: Received August 16, 2006; Revised August 02, 2007; Accepted August 02, 2007; Published March 13, 2008
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The blocking effect is the major drawback in discrete cosine transform (DCT)-based codecs at low bit rates. When a high compression ratio is required, boundaries between adjacent image blocks become visible. This kind of degradation probably will affect the judgment of an end user. In this work, a four-neighboring-block zero-masking technique is proposed in the DCT frequency domain. The proposed algorithm uses a shift block within four adjacent DCT blocks to reduce computational complexity. By slightly modifying several DCT coefficients in the shift block, the artifacts that result from quantization and dequantization processes are alleviated. The simulation results show that both visual perception and objective image quality are noticeably improved.

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Citation

Ying-Wen Chang and Yen-Yu Chen
"Novel artifact removal algorithm in the discrete cosine transform domain", J. Electron. Imaging. 17(1), 013012 (March 13, 2008). ; http://dx.doi.org/10.1117/1.2892682


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