基于纹理方向和空域相关的HEVC帧内快速编码算法

发布时间：2018-03-26 09:19

本文选题：高效视频编码(HEVC)　切入点：快速编码算法　出处：《光电子.激光》2014年09期

【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(Bj錸ntegaard delta bit rate)上升约0.81%,BDPSNR(Bj錸ntegaard delta peak signal-to-noise rate)降低了0.047dB。
[Abstract]:In order to reduce the complexity of efficient video coding (HEVC), a fast intra coding algorithm based on texture direction and spatial correlation is proposed. On the one hand, the weight of correlation is determined by the best partition size of adjacent coding unit (CUcoding Unit). According to the rate-distortion generation value of the coded CU, the correlation factor of the CU segmentation size is defined, and the CU segmentation is terminated ahead of time by comparing this factor. On the other hand, the texture direction of the prediction unit is obtained by using the Sobel operator. The candidate pattern set is determined by determining the significance of the texture direction, and then the prediction pattern is modified according to the pu size. Finally, we traverse these candidate modes to select the optimal modes. The experimental results show that compared with the original HEVC coding method, the average coding time of this algorithm is reduced by 36.84 BDBRJ, rhenium ntegaard delta bit bit in the full I frame mode, and the rise of BDPSNRJ rhenium ntegaard delta peak signal-to-noise ratehas decreased by 0.047 dB.
【作者单位】：宁波大学信息科学与工程学院;
【基金】：国家自然科学基金(61171163,61271270,61111140392,U1301257)资助项目
【分类号】：TN919.81

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