视频编码预处理算法研究

针对现有降噪采用时空域滤波、去块效应采用环路滤波/后处理这种分而治之方案的缺点,通过分析降噪的基本技术、低码率视频应用中块效应产生的原因和去块效应的常用方法,从滤除不需要或相对不重要的高频离散余弦变换(DCT,discrete cosine transform)系数角度提出了降噪和去块效应可同时处理的设想。新提出的预处理算法是根据图像纹理特性、运动情况和码率约束等,在图像的不同区域采用不同强度的自适应双边滤波,这样不仅去噪,滤除不重要的细节以便于高效压缩,避免块效应的产生,同时也可起到一定程度的码率控制效果。

Pre-processing algorithm for video coding

After analyzing the disadvantage of separate solutions which uses spatial filtering to denoise and in-loop filtering/post-processing to deblock,we decribe a notion that denoising and deblocking are alike in terms of removing the high frequency information which are not required or less important.Moreover,in order to reduce coding complexity a pre-processing algorithm is proposed which can be used to filter noise and less important texture simultaneously.This pre-processing algorithm can adapt its filter str...