摘要
提出了帧内预测算法中邻块间预测选项的相关性、预测选项和SAD相关性的概念,在此基础上提出了一种适用于H.264/AVC的自适应空域帧内预测算法,该算法利用上述的两种相关性预测当前块的帧内预测选项;利用“半步停”技术自适应地中止预测.实验结果表明,该算法在保证重构图像质量和压缩比的同时,计算复杂度仅相当于原有算法的7%左右.
Intra prediction has been adopted in some video coding standards as an effective solution to increase the coding efficiency of I frame. In H. 264/AVC, the current block is predicted in spatial domain, which has a better performance in regard to the traditional prediction methods in frequency domain, but its computation complexity is much larger. By great number of experiments, authors found that the prediction modes of spatial adjacent blocks in H. 264/AVC are highly correlated, and this kind of correlation can be well represented by the SAD value. Based on these two characteristics, a novel fast intra prediction algorithm in spatial domain is presented in this paper. It utilizes the above characteristics to predict the intra prediction mode of the current block, and use the “half-way stop” technique to terminate the process of intra prediction adaptively. Experimental results show that with little degradation in the coding gain, the computational load of the proposed algorithm can achieve about 7% of original algorithm.
出处
《计算机学报》
EI
CSCD
北大核心
2005年第11期1853-1860,共8页
Chinese Journal of Computers
基金
教育部优秀青年教师资助计划项目基金(2003)资助
作者简介
倪伟,男,1981年生,博士研究生,研究方向为视频编码、多媒体通信、图像处理.E-mail： weini@mail.xidian.edu.cn.
郭宝龙,男,1962年生,教授,博士生导师,中国图像图形学会理事,AAAS国际会员,中国电子学会高级会员,主要研究领域为图像处理与图像通信、智能信息处理、神经网络等.
杨镠,女,1981年生,博士研究生,研究方向为图像处理和虚拟现实.
