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A New Adaptive Reduction Algorithm of Blocking Artifacts
Author(s): XIE Sheng-li, ZHOU Zhi-heng
Pages: 1897-
1900
Year: 2005
Issue:
10
Journal: ACTA ELECTRONICA SINICA
Keyword: 块效应; 自适应处理; Sigmoid函数; Sigma滤波器;
Abstract: 基于块DCT图像压缩方法通常会因比特率低而导致块效应.本文提出一种新的块效应消除算法,目的是既能消除块效应又能充分保护图像的边缘和纹理.算法首先引入均匀块的定义,并给出一种阈值可变的判断转换块是否均匀块的标准.对均匀块的每一行(或列)分别使用自适应的Sigmoid函数代替阶梯函数,以消除块效应;而对非均匀块使用Sigma滤波器进行平滑.仿真结果表明,本文的算法相比Liu(2002)和Luo(2003)提出的相应算法,有更良好的性能.
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