Pattern-matching scheme for HEVC screen content coding
Yawei Xu, Jianxin Song · Advances in computer science research · 2016
Screen Content refers to image/video generated by electronic devices, like cartoons, 3-D games or captures of computer screens or video with text overlay etc.The existing video coding techniques don't perform well on screen content.In this paper, the characteristics of screen content and coding efficiency of HEVC on screen content are analyzed.This paper proposes a pattern-matching mode aimed at improving the coding efficiency for screen content video based on HEVC.The scheme uses basic color and index map (BCIM) to convert the pixel values in a CU to index values.Then a dictionary based coding method is adopted to code the index values.In addition, a fast dictionary searching algorithm based on hash-table is proposed to reduce the string matching time.The experiment result shows the proposed mode achieves significant coding efficiency improvement on screen content compared with HEVC.