数字电视信源编码技术.pptx

Copyright?201;Copyright?201;Copyright?201;Copyright?201;Copyright?201;Copyright?201;Copyright?201;Copyright?201;Copyright?201;Copyright?201;Copyright?201;Copyright?201;视频压缩编码技术第一代视频编码;Copyright?201;Copyright?201;Copyright?201;Copyright?201;预测器＋＋en’Xn’预测器＋;Copyright?201;3.2帧内预测编码X1X2;3.3帧间预测编码帧存储器;Copyright?201;Copyright?201;运动补偿帧间预测编码方框图：＋;Copyright?201;前一帧搜索区当前帧像素块M+2;Copyright?201;块匹配准则：均方误差（MS;Copyright?201;搜索方法：穷尽搜索法：对搜;4、变换编码4.1变换编码;Copyright?201;Copyright?201;Copyright?201;Copyright?201;Copyright?201;利用人眼的视觉冗余性左上角附近;Copyright?201;Copyright?201;是一种最优可变长码，基本原理为;例如：设信源各符号出现的概率为;Copyright?201;Copyright?201;游程编码:将一维序列用二维数组;Copyright?201;DC系数的DIFF熵编码（查表;AC系数熵编码（表1）AC系数;AC系数熵编码（表2）游程/位;Copyright?201;国际电信联盟（ITU）开发用于;Copyright?201;Copyright?201;Copyright?201;Copyright?201;Copyright?201;Copyright?201;Copyright?201;Copyright?201;MPEG2视频编码技术1、MP;Copyright?201;2、MPEG-2的型和级;Copyright?201;Copyright?201;Copyright?201;编码图像的显示顺序和传送顺序I;Copyright?201;Copyright?201;Copyright?201;Copyright?201;宏块由16×16像素的Y阵;宏块条由处于同一水平宏块排内的;Copyright?201;图像组由一个图像序列中连续的几;Copyright?201;6视频基本码流的层次结构系;GOP1GOPSCGOP;Copyright?201;H.264视频编码技术1、H;高效的视频编码良好的网络亲和性;2、H.264视频编码器结构;很多标准都有不同的配置Prof;ExtendedProfil;Copyright?201;Copyright?201;Copyright?201;Copyright?201;1）图像的划分Copyrigh;Slice#0Slice#;Copyright?201;2）宏块编码结构Entropy;Copyright?201;与以往的视频编码标准相同之处：;Copyright?201;亮度4x4帧内预测模式（9种）;举例MABCDEFGHIJKL;举例MABCDEFGHIJKL;Copyright?201;Copyright?201;Copyright?201;Copyright?201;4x4整数变换：变换矩阵只有±;Copyright?201;Copyright?201;Copyright?201;Copyright?201;在H.264中有三种??同的数据;Copyright?201;Copyright?201;Copyright?201;Copyright?201;0：未规定1：非IDR图像中不;Copyright?201;Copyright?201;Copyright?201;SPS#1PPS#1Slice;Copyright?201;IDR帧IDR帧一定是I;Copyright?201;AVS视频与MPEG标准都采用;Copyright?201;return;Copyright?201;2、压缩损伤的产生原因DCT量;DCT量化VLC缓存器码率控制;Copyright?201;Copyrigh