一种H.264/AVC帧内编码算法  

A Novel Intra Coding Algorithm for H.264/AVC

作　　者：刘国丽[1] 张静霞[1] 姜颖[1] 张斌[1] 

机构地区：[1]河北工业大学计算机科学与软件学院,廊坊065000

出　　处：《微计算机信息》2010年第24期165-167,共3页Control & Automation

基　　金：基金申请人:刘国丽;项目名称:基于小波分析的视频图像压缩算法研究;基金颁发部门:河北省教育厅(2008416)

摘　　要：帧内编码是H.264/AVC的一个重要组成部分,它充分利用了帧内图像的空间相关性,提高了压缩效率,对编码器整体性能的提高具有重要作用。本文分析了一种帧内编码方案,方案从三个方面改进H.264帧内编码:在现有预测模式基础上增加9种双向预测模式;对于某些预测模式,H.264的整数变换以一种方向变换为其辅助变换;在CAVLC中编码残差系数时,引入了一个表示编码的隔行扫描块数目的参数noBlock。实验结果表明,与H.264相比,CABAC编码与CAVLC编码的比特率平均分别减少了7.1%、9.8%。Intra coding is an important component of H.264/AVC,making full use of the spatial correlation of intra images,improving the efficiency of compression,playing an important role in improving the overall performance of the coder.In this paper,a novel intra coding scheme is analyzed.The proposed scheme improves H.264 intra coding from three aspects：H.264 intra prediction is enhanced with additional bi-directional intra prediction modes;H.264 integer transform is supplemented with directional transforms for some prediction modes;and residual coefficient coding in CAVLC is improved,a parameter called noBlock is introduced in this paper.This parameter,noBlock,is used to represent the number of interleaved blocks coded,Experimental results show that compared with the standard intra prediction mode of H.264,together the improvements can bring on average 7% and 10% coding gain for CABAC and for CAVLC respectively.

关 键 词：帧内编码 双向预测 方向变换 VLC 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] TN919.81[自动化与计算机技术—计算机科学与技术]