摘要
H.264引入帧内预测编码并用率失真优化(RDO)进行预测模式选择,显著提高了压缩率,但增加了计算复杂性。H.264帧内预测编码包括Intra_4×4、Intra_16×16两种预测模式,在分析此两种帧内预测模式特性的基础上,提出设置阈值的方法来快速选择Intra_4×4、Intra_16×16预测模式的最优模式,并以此对原算法进行了改进。仿真实验表明,改进的算法在保持PSNR基本不变和码率微小增加的情况下,计算量能显著减少。
Intra-prediction coding and mode decision based on Rate-Distortion Optimization （RDO） technique were used in the H. 264, which raised the compression ratio, but increase the computing complexity as well. Intra-prediction coding includes Intra 4 ×4 and Intra_16 × 16 prediction mode. Based on the analysis of the features of Intra_4 ×4 and Intra_16 × 16, a threshold was proposed to save computation. Then, the algorithms for intra-prediction mode decision was modified. The experimental results show that the proposed algorithm can increase the speed of intra coding significantly with negligible loss of PNSR and increase of bite-rate.
出处
《计算机应用》
CSCD
北大核心
2006年第8期1860-1862,共3页
journal of Computer Applications
基金
国家973规划资助项目(51308)
关键词
H.264
帧内预测
模式选择
中止域值
H. 264
intra-prediction
mode decision
termination thresholds
