低码率下可扩展视频编码中的环路滤波改进

Improvement of deblocking filter in scalable video coding for low bit-rate coding

针对低码率的情况下效应比较严重的情况,提出在低码率下对环路滤波的一种改进的方法。对于空间基本层的环路滤波,采取与H.264/AVC兼容的环路滤波算法。但是对于空间增强层,特别是在低码率的情况下,加入一个对图像边界判断的算法,使其在滤波的时候,不会滤掉真实边界。与原来的算法相比,在低码率的情况下,码率有所降低,而且PSNR值也有增加,主观视觉上,也比原来的算法有提高。

In this paper,we propose an efficient method to improve the deblocking filter in SVC（Scalable Video Coding） for low bit-rate coding.We do the basement coding compatible with H.264/AVC,but in enhancement coding we use the method which can improve detecting the real edges of image.In enhancement,we add a judgement to detect the real edges of the image,so we can protect the real edges of the image when deblocking filter working,especially in low bit-rate.Compared with previous method,the experiment results show that the PSNR almost is increased,and the bit-rates are also reduced.We also can see the edges are clearer than before in vision.