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总览 评价 王中刊 , 赵旦峰 * , 戴应登 ( 哈尔滨工程大学信息与通信工程学院,哈尔滨 150001; ) 摘要: 与上一代视频编码标准H.264/AVC相比,新一代视频编码标准HEVC/H.265的压缩效率提高了近50%。但是由于编码时高计算复杂度带来的高延时问题,导致HEV
王中刊, 赵旦峰*, 戴应登
(
哈尔滨工程大学信息与通信工程学院,哈尔滨 150001; )
摘要:
与上一代视频编码标准H.264/AVC相比,新一代视频编码标准HEVC/H.265的压缩效率提高了近50%。但是由于编码时高计算复杂度带来的高延时问题,导致HEVC标准在走向商业化应用的过程中面临巨大挑战。因此,本文以HEVC帧内预测模式选择过程为切入点,通过大量实验统计得出粗选择过程产生的第一、第二候选模式成为最终预测模式的可能性极大,分析得到第一、第二候选模式与图像纹理复杂度之间的联系,并提出了一种帧内预测模式选择快速算法。实验结果表明,提出的算法在保证编码压缩率以及编码质量的情况下平均能减少22%的编码时间。
关键词:
视频编码;HEVC标准;帧内预测;模式选择;
Wang Zhongkan, Zhao Danfeng*, Dai Yingdeng
(
Information and Communication Engineering School,Harbin Engineering University,Harbin 150001; )
Abstract:
Compared with the previous generation video coding standard H.264/AVC,the compression efficiency of new video coding standard HEVC/H.265 increased by nearly 50%.However,due to the high latency problem caused by high computational complexity when coding vedio,the HEVC standard faces a great challenge in the process of commercialization.Therefore,this paper starts from the perspective of mode selection process for intra prediction in HEVC,it is concluded that the first and second candidate mode generated by the rough selection process are the most likely to be the final prediction mode though a large number of experimental statistics. We analyze the relationship between the first and second mode and image texture complexity,and proposed a fast mode decision algorithm for intra prediction. The experimental results show that the proposed algorithm can reduce the encoding time by 22% on average while ensuring the coding compression rate and coding quality.
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