关键词: 块离散余弦变换, 方块效应, 后滤波

Abstract: In order to reduce the visible blocking artifacts at the block boundary with Block Discrete Cosine Transform(BDCT) at low bit rates, a new blocking-artifact reduction algorithm in DCT domain is presented in this paper. An edge detection criterion is given. For the smooth blocks, one-dimension DCT on each row of the horizontally adjacent blocks is transformed and the parameters effecting on blocking artifacts are modified. For the texture blocks, the post-filtering technology is used to smooth block boundaries. The simulation result shows that the proposed method can reduce blocking artifacts as many as possible while preserving edge information.

Key words: BDCT, blocking artifacts, post filtering