基于HEVC的ISC算法的颜色量化预处理

ISC with color quantization based on HEVC

文章在基于HEVC框架下提出了增加颜色量化预处理的无损一维串匹配方法(Intra String Copy)。在没有颜色量化预处理环节的无损一维匹配算法可能会由于存在视频采集误差或是上下文造成的细微误差而导致匹配失败,这对以无损匹配为核心的ISC造成了很大的影响。文章借鉴了图像处理中八叉树的颜色量化方法,对视频图像信息进行颜色量化预处理后再进行一维串匹配编码,对屏幕图像视频的编码适应性有了很大的提升。

This paper proposed an intra string copy method with octree color quantization based on the frame of HEVC. In theory, if the contents in two different position of a picture are the same, the corresponding string should match to each other exactly. But the fact is that they may don’t match to each other due to some tiny video collection errors or some small errors brought on the context of the screen, which hurts the performance of the intra string copy which focused on lossless string matching badly. To reduce the hurts, the proposed method use the typical octree quantization as a pre-processing step to make sure the high performance of intra string copy.