基于运动特征的HEVC快速帧间预测编码研究

为了降低高效视频编码(HEVC,high efficiency v ideo coding)的帧间预测复杂度,提出了一种基于运动特征的HEVC快速帧间预测新方 法。首先利用视频相邻帧的时域相关性,通过计算 每个待编码单元(CU)及其子块的帧差离散度(FDD)确定该CU的最佳编码深度d ；再依据该深度下CU的区 域运动特征(RMF_d)将待编码CU划分为3类运动区域,进而确 定该CU的候选帧间预测模式,减少 不必要的帧间预测模式遍历过程。试验结果表明,本算法可以在保证编码性能损失不大的前 提下显著提高编码效率；与标准算法相比,在低延时和随机访问两种编码结构下,同等客观 质量下码率(BDBR)分别增加0.89% 和0.83%,同时节省了51.6%和48.5%的编码时间。

Research of fast HEVC inter prediction coding based on motion features

In order to reduce the high efficiency video coding (HEVC) inter-fram e prediction complexity,in this paper we propose an HEVC inter pred iction mode selection algorithm based on motion features.First,we use the time- domain co rrelation between adjacent frames in digital video to determine the optimal c odi ng depth through calculating the frame difference dispersion (FDD) of each coding unit (CU) and its four sub-blocks,then we can divid e the CU into three kinds of motion areas according to the regional motion feature (RMF) in the optimal codin g depth,finally we can obtain the candidate inter prediction modes and reduce th e u nnecessary inter prediction process.The experimental results show that this a lgorithm can improve the coding efficiency under the premise of a little coding pe rformance loss.Under two coding structures of low-delay and random-access,com pared with the standard method,our algorithm increases bit rate by 0.89% and 0. 89% and saves coding time by 51.6% and 48.5%,respectively with the same object ive quality.