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Journal of Electronic Imaging

Novel artifact removal algorithm in the discrete cosine transform domain
Author(s): Ying-Wen Chang; Yen-Yu Chen
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Paper Abstract

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.

Paper Details

Date Published: 1 January 2008
PDF: 12 pages
J. Electron. Imaging. 17(1) 013012 doi: 10.1117/1.2892682
Published in: Journal of Electronic Imaging Volume 17, Issue 1
Show Author Affiliations
Ying-Wen Chang, Chung Chou Univ. of Technology (Taiwan)
Yen-Yu Chen, Chung Chou Univ. of Technology (Taiwan)

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