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: 

• TP37