视频显示流压缩的技术与标准
Video Display Stream Compression Technologies and Standards

随着计算机、电视机和手机等显示设备分辨率的迅速增加，采用显示流压缩（Display stream compression,DSC）技术解决显示链路带宽不足已成业界的共识。近年来陆续出现了JEPG-XS，H.264/AVC和Dirac（VC-2）的纯帧内编码、HEVC-SCC屏幕内容编码和VESA的DSC等显示链路压缩技术。其中最为典型的是视频电子标准协会(Video electronics standands association, VESA)的 DSC标准，这是一个被广泛接受的用于显示链路的低成本、短延时和视觉损的轻量级编解码标准。DSC的高效编码技术包括先进的预测、历史彩色索引、简捷的熵编码以及良好的速率控制等。本文综述了DSC标准的新特性和主要技术概况。
With the rapid increasing resolution of display devices in computer, television and mobile phone, there is a consensus in the industry to solve the problem of lacking of display link bandwidth using display stream compression(DSC) technologies. Hence, several display stream compression methods continually appear in recent years, for example JPEG-XS, intra-only coding in H.264/AVC and Dirac (VC-2), HEVC-SCC screen contents coding and DSC of VESA, etc. Among these, the VESA DSC is a widely acceptable standard that is used in display link for a low cost, low delay, and visually lossless lightweight codec. A number of high efficient coding technologies are used in DSC including advanced prediction, indexed color history, plain entropy coding and perfect rate control. The paper overviews these new features and key technologies in DSC standard.