摘要
帧内预测是H.264视频编码标准的重要组成部分。为了保证在图像质量和编码比特率大致不变的前提下,减少帧内预测模式选择的编码时间,提出了一种基于4′4块的纹理方向性和4′4块与16′16块之间的相关性并通过设置双阈值进行选择预测模式的快速算法。实验结果表明该算法与帧内预测编码的全搜索算法相比,编码时间节约了35%～40%,信噪比损失了0.03～0.1dB。
Intra-prediction is an important part of H.264. A fast algorithm for intra-prediction mode decision is pre- sented in this paper to ensure image with less performance degradation and bit-rate increase, while reducing intra- prediction coding time. It uses the texture direction of 4 x 4 block and the correlation between 4 ~ 4 block and 16 x 16 block to predict the intra-frame mode, which chosen by double thresholds. Experimental results show that compared with the full searching algorithm, this algorithm can decrease the coding time by 35%-40%, while PSNR drops 0.03-0.1 dB.
出处
《计算机工程与应用》
CSCD
2012年第26期148-151,205,共5页
Computer Engineering and Applications
关键词
H.264
帧内预测
模式选择
率失真优化
H.264
intra prediction
intra mode decision
Rate Distortion Optimization（RDO）
