计算机工程与应用 ›› 2012, Vol. 48 ›› Issue (26): 148-151.

• 图形、图像、模式识别 • 上一篇    下一篇

H.264帧内预测模式选择快速算法

孙  杨,王英坤,徐伯庆   

  1. 上海理工大学 光电信息与计算机工程学院,上海 200093
  • 出版日期:2012-09-11 发布日期:2012-09-21

Fast intra-prediction mode selection algorithm for H.264

SUN Yang, WANG Yingkun, XU Boqing   

  1. School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
  • Online:2012-09-11 Published:2012-09-21

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0.03~0.1 dB。

关键词: H.264, 帧内预测, 模式选择, 率失真优化

Abstract: Intra-prediction is an important part of H.264. A fast algorithm for intra-prediction mode decision is presented 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 [4×4] block and the correlation between [4×4] block and [16×16] 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.

Key words: H.264, intra prediction, intra mode decision, Rate Distortion Optimization(RDO)