3D-HEVC深度图帧内CU尺寸快速决策算法

摘要

为了降低3维高性能视频编码(3D-HEVC)中深度图帧内编码过程的计算复杂度,提出了一种基于灰度直方图的提前终止编码单元(Coding Unit,CU)划分的快速算法.首先,对当前CU的像素值进行统计并生成灰度直方图,然后计算灰度直方图中灰度值分布的区间长度,当灰度值分布的区间长度小于给定的阈值时,提前结束当前CU的分割进程.实验结果表明,与原始HTM13.0算法相比,所提算法平均减少了35.64％的深度图编码时间,且合成视点的比特率仅仅增加了0.11％,有效降低了深度图的编码复杂度.%For reducing the high computational complexity of depth maps intra-coding,an algorithm is proposed to early terminate the CU splitting process by using the gray histogram of current CU.Firstly,all the pixel values of each CU are counted and then a gray histogram is generated.After that,the distance between the maximum gray value and the minimum gray value in gray histogram is calculated.If the distance is smaller than a threshold,the CU splitting process can be early terminated.Experimental results show that compared with HTM 13.0,the proposed algorithm can reduce 35.64％ of depth map encoding time on average of with 0.11％ bitrate increasing in synthesized views.