| 李持航,彭宗举,陈芬.基于纹理方向和空域相关的HEVC帧内快速编码算法[J].光电子激光,2014,(9):1777~1784 |
| 基于纹理方向和空域相关的HEVC帧内快速编码算法 |
| Fast intra coding algorithm for HEVC based on texture direction and spatial co rrelation |
| 投稿时间：2014-04-20 |
| DOI： |
| 中文关键词: 高效视频编码(HEVC) 快速编码算法 快速分割 预测模式选择 纹理方向 |
| 英文关键词:high efficiency video coding (HEVC) fast coding algorithm fast segm entation prediction mode selection texture direction |
| 基金项目:国家自然科学基金(61171163,61271270,61111140392,U1301257)资助项目 (宁波大学 信息科学与工程学院,浙江 宁波 315211) |
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| 中文摘要: |
| 为了降低高效视频编码(HEVC)的复杂度,提出了 一种基于纹理方 向和空域相关性的帧内快速编码算法。一方面,利用相邻编码单元(CU,coding unit)的 最佳分割尺寸确定相 关性的权重,并根据已编码CU的率失真代价值定义了CU分割尺寸的相关性因子,通过 比较该因子 提前终止CU分割；另一方面,利用Sobel算子求取预测单元(PU,prediction unit)子块 的纹理方向,通过判定 其纹理方向显著性确定相应的候选模式集,然后根据PU大小对所得的预测模式修正处理,最 后遍历这些候选 模式选取最优模式。实验结果表明:本文算法相对于原始HEVC编码方法,在全I帧模式下编 码时间平均减 少36.84%,BDBR(Bjntegaard delta bit rate)上升约0.81% ,BDPSNR(Bjntegaard delta peak signal-to-noise rate )降低了0.047dB。 |
| 英文摘要: |
| In order to reduce the encoding computational complexity of the emergi ng high efficiency video coding (HEVC),a fast intra coding algorithm with spatial correlation whose dev elopment is based on the texture has been proposed.On one hand,a weighting factor is proposed through the effec tive selection of the optimal size of adjacent coding unit (CU).Then,a correlation factor is defined based on rate distortion cost and this factor is able to terminate the division of the CU ahead of time.On the other hand,So bel operator is utilized to get the texture direction of the sub-block of prediction unit (PU).By judging the consp icuousness of the PU texture direction,a corresponding candidate mode set is selected.Furthermore,further refinement wh ich means amending the prediction mode according to the PU size is done.And finally,all of th e coding modes in the mode set are traversed and the mode selection is finished.Experimental results s how that the propo sed method reduces encoding time of 36.84% on average,with a BD-bit rate increase of 0.81% and a BD-PSNR loss of 0.047dB compared with the original HEVC encoding scheme.Consequently,the proposed algorithm can redu ce the encoding computational complexity efficiently,while the rate-distortion performance remains unchanged practically. |
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