一種基于人類視覺系統(tǒng)的去塊效應(yīng)算法
A Deblocking Algorithm Based on HVS
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摘要: 基于塊離散余弦變換的圖像和視頻壓縮主要缺點(diǎn)就是在低比特率時(shí)會(huì)在塊邊界出現(xiàn)明顯的方塊效應(yīng)。本文提出一種充分利用人類視覺特性,在圖像的平滑區(qū)和紋理區(qū)分別采用一維DCT域?yàn)V波和空間域?yàn)V波的去塊效應(yīng)算法。實(shí)驗(yàn)結(jié)果表明該算法既能有效地去除方塊效應(yīng)又能保護(hù)圖像的邊緣信息。
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關(guān)鍵詞:
- 塊離散余弦變換; 方塊效應(yīng);人類視覺系統(tǒng); 斜率均方差
Abstract: A major drawback related to the Block-based Discrete Cosine Transform(BDCT) for image and video compression is that the decoded images, especially at very low bit rates,exhibit highly noticeable blocking artifact near the block boundaries. In this paper, a deblocking algorithm based on Human Visual System (HVS) is proposed. For smooth regions, one dimension DCT domains filter is applied to reduce the blocking artifacts, but for texture regions a spatial filter is used. The experimental results show that the proposed algorithm reduces the blocking artifacts effectively and preserves the original edges faithfully. -
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