摘要
块效应在低比特率图像中极为明显,提出一种基于方块方向活动性的自适应空域去块效应算法。首先,通过对偏移的块进行块分析来对每一个块进行模式选择,接着通过1-D自适应平滑滤波器对块效应进行滤波。实验结果表明,与之前的算法相比,该算法有效的去除了块效应,信噪比有较大的提高,且算法同时处理了一个块中的竖直和水平边界,再跳入下一个块,大大减小了硬件实现时的内存空间。
Blocking artifact is evident in the reconstructed image especially when the compression ratio is high.A new adaptive de-blocking algorithm on spatial domain is proposed.First,the original DCT block is shifted by four pixels right and four pixels down,then the horizontal and vertical activity of each block is calculated.Based on the mode selection,a 1-D edge-adaptive filter is used to smooth the block edges of the image to alleviate the block artifact.The experimental results show that the block artifact is alleviated effectively while PSNR is improved in the objective respect.Another advantage is that it processes both vertical and horizantal boundary in a block then turn to next which reduce the necessary store memory largely.
出处
《信息技术》
2011年第8期86-88,93,共4页
Information Technology
关键词
去块
自适应滤波
水平活动性
竖直活动性
de-blocking
adaptive filtering
horizantal activity
vertical activity
