%0 Journal Article
%T Screen Content Coding by Combined Full-chroma LZMA and Subsampled-chroma HEVC<br>融合全色度LZMA与色度子采样HEVC的屏幕图像编码
%A Zhang Pei-jun Wang Shu-hui Zhou Kai-lun Lin Tao
%A <br>张培君
%A 王淑慧
%A 周开伦
%A 林涛
%J 电子与信息学报
%D 2013
%I 
%X Considering the anisotropic characteristics of screen content, satisfactory coding efficiency cannot be achieved when screen content is coded only by traditional image/video coding tools. A new Dual-coder Mixed Chroma-sampling-rate (DMC) technique is proposed for full-chroma (YUV4:4:4) screen content coding by adding a dictionary-entropy based coder which extracted from Lempel-Ziv-Markov chain Algorithm (LZMA) to existing High Efficiency Video Coding (HEVC) SDK tools for better coding efficiency of discontinues-tone portion of screen content. Two coders are seamlessly unified and the optimal coder is selected adaptively macroblock-by-macroblock to fit the characteristics of the macroblock content. A mixed chroma-sample-rate method is also proposed for reducing distortions to convert YUV4:4:4 to YUV4:2:0. Coding experimental results show that DMC coding can achieve much higher PSNR than the current HEVC. There are also obvious improvements on the subjective visual quality differences between them.
%K High Efficiency Video Coding (HEVC)
%K Lempel-Ziv-Markov chain Algorithm (LZMA)
%K Screen content coding
%K Dictionary-entropy coder
%K Mixed chroma-sampling-rate<br>高效视频编码
%K Lempel-Ziv-Markov
%K chain
%K Algorithm(LZMA)
%K 屏幕图像编码
%K 字典-熵编码器
%K 混合色度采样率
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=1319827C0C74AAE8D654BEA21B7F54D3&jid=EFC0377B03BD8D0EF4BBB548AC5F739A&aid=D7FACDD289E24C2D8CB19475260728B0&yid=FF7AA908D58E97FA&iid=CA4FD0336C81A37A&journal_id=1009-5896&journal_name=电子与信息学报&referenced_num=0&reference_num=0