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When a high compression ratio is required, the block discrete cosine transform (BDCT) decoded image suffers from the blocking effect: boundaries between adjacent image blocks visible for low bit rates. A blocking effect reduction algorithm based on DCT transform and Markov random field (MRF) is proposed to reduce blocking artifacts as many as possible, while preserving edge information. In this paper,...
When a high compression ratio is required, the block discrete cosine transform (BDCT) decoded image suffers from the blocking effect: boundaries between adjacent image blocks visible for low bit rates. A blocking effect reduction algorithm in DCT domain is proposed to reduce blocking artifacts as many as possible, while preserving edge information. In this paper, the model of blocking artifacts is...
A major problem for the block-based discrete cosine transform (BDCT) techniques is that the decoded images, especially at very low bit rates, exhibit highly noticeable blocking artifacts near the block boundaries. In this paper, a new deblocking algorithm based on wavelet transform and Markov random field (MRF) is proposed. The blocking-artifacts image is firstly processed with a simple and effective...
In this paper, a new wavelet-based deblocking algorithm is proposed. It sufficiently utilizes blocking-artifact features in wavelet domain. After the wavelet transform, the blocking artifacts appear as horizontal line-shape effect in high-low subband, vertical line-shape effect in low-high subband and grid-shape effect in high-high subband. Adaptive operators for different subbands can be computed...
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