一种基于自适应阈值的H.264/AVC帧内预测模式快速选择算法

滕国伟; 王国; 张兆扬; 石旭利; 余松煜

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一种基于自适应阈值的H.264/AVC帧内预测模式快速选择算法

1.
上海广电(集团)有限公司中央研究院,上海,200233上海大学通信学院,上海,200072上海交通大学图象通信与信息处理研究所,上海,200030

详细信息

通讯作者:
滕国伟

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- 被引次数: 0
出版历程
- 收稿日期: 2004-02-24
- 修回日期: 2006-02-23
- 刊出日期: 2006-07-20

A Fast Intra-prediction Mode Selection Algorithm of H.264/AVC Based on Adaptive Thresholds

1.
Central Research Academy, SVA (Group) Co. Ltd, Shanghai 200233School of Communication and Information Engineering, Shanghai University, Shanghai 200072Institute of Image Communication and Information Processing, Shanghai Jiaotong University, Shanghai 200030

摘要

摘要: 在H.264/AVC中,帧内编码采用帧内预测来提高编码效率.色度块尺寸为8×8,亮度块包括4×4和16×16两种尺寸,每种块提供多种预测模式,因此这种多模式选择极大地增加了编码复杂性.本文利用色度块和亮度块以及亮度4×4和16×16块模式选择之间的相关性,提出一种基于RDO(Rate distortion optimization)不同判决依据的快速帧内预测模式选择算法,并能够自适应调整阈值.实验结果表明与校验模型JM7.2相比在信噪比和码率变化不大的同时,能够使Ⅰ帧编码速度平均提高6倍,并可节约P帧25%的编码时间.
- H.264/AVC /
- 帧内预测 /
- 模式选择
Abstract: In H.264/AVC, intra-prediction is used to improve the coding efficiency of I-frames. The size for the chroma block is 8×8, and the sizes for the luma block are 4×4 and 16×16. Each kind of block provides many prediction modes, so that this multi-mode selection increases the coding complexity greatly while improving coding efficiency. In this paper, a fast intra-prediction mode selection algorithm with adaptive thresholds and different criterion based on RDO (Rate Distortion Optimization) is proposed using the mode selection relation of chroma block and luma block and the relation of luma 4×4 block and luma 16×16 block. Experiment results show that the proposed algorithm can averagely speed up 6 times for I frame coding or provide 25% time savings for P frames in comparison with JM7.2 while maintaining similar PSNR and bit rate.
- H.264/AVC /
- intra-prediction /
- mode selection