摘要:
视频压缩标准H.264/AVC的压缩率很高,但其算法复杂,编码时间较长。针对帧内4×4块提出基于方向预测模式度量的快速预测算法,通过对当前4×4块帧内预测方向的度量,利用相邻块和相邻方向预测模式的相关性进行帧内模式预测。实验结果表明,与全搜索算法相比,在采用全I帧编码的情况下,该算法的编码时间减少43%,输出的视频比特率仅增加0.8%,且PSNR基本保持不变。
关键词:
帧内预测,
预测方向,
率失真优化
Abstract: Video compression standard H.264/AVC has high compression ratio, but its algorithm is complex and the coding time is long. Aiming at the intra-frame 4×4 block, this paper proposes a fast prediction algorithm based on measurement of direction prediction mode. By measuring the intra-frame prediction direction of 4×4 block, it uses the correlation between neighboring blocks and neighboring direction prediction mode to predict the intra-frame mode. Experimental results show that compared with the full searching algorithm, this algorithm can decrease the coding time by 43% and only increase the output video bit rate by 0.8% while keeping PSNR almost unchanged.
Key words:
intra-frame prediction,
prediction direction,
Rate Distortion Optimization(RDO)
中图分类号:
王启文;黄东军. H.264中4×4块的快速帧内预测算法[J]. 计算机工程, 2010, 36(2): 217-219.
WANG Qi-wen; HUANG Dong-jun. Fast Intra-frame Prediction Algorithm for 4×4 Block in H.264[J]. Computer Engineering, 2010, 36(2): 217-219.