Novel artifact removal algorithm in the discrete cosine transform domain

Ying-Wen Chang; Yen-Yu Chen

doi:10.1117/1.2892682

1 January 2008 Novel artifact removal algorithm in the discrete cosine transform domain

Ying-Wen Chang, Yen-Yu Chen

Author Affiliations +

Journal of Electronic Imaging, Vol. 17, Issue 1, 013012 (January 2008). https://doi.org/10.1117/1.2892682

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.

©(2008) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Ying-Wen Chang and Yen-Yu Chen "Novel artifact removal algorithm in the discrete cosine transform domain," Journal of Electronic Imaging 17(1), 013012 (1 January 2008). https://doi.org/10.1117/1.2892682

Published: 1 January 2008

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