基于时域相关性的HEVC帧间预测快速决策算法

Fast Inter-frame Prediction Decision Algorithm for HEVC Based on Temporal Correlation

为了降低高效视频编码(HEVC)的计算复杂度提出一种帧间预测快速决策算法。首先,统计分析最大CU(LCU)的离散度与划分深度之间的关系,采用自下向上合并CU的方式,对不同深度下的CU划分进行决策。然后,利用离散度中计算的参数,参与计算同位CU与当前CU的相关性,建立相关性与帧间预测模式之间的线性关系,指导帧间模式的预测。最后,融合两种方法,优化该算法计算量,减少帧间预测的计算量。通过实验对比论文算法与HM14.0,在峰值信噪比损失很小的情况下,视频质量基本不变,减少了30%以上的编码时间。

In order to reduce the computational complexity of High Efficiency Video Coding(HEVC),an inter-prediction fast decision algorithm is proposed.Firstly,the relationship between the dispersion degree of the largest CU(LCU)and the depth of division is statistically analyzed,and the CU division at different depths is determined by combining CU from the bottom up.Then,using the parameters calculated in the dispersion,the calculation of the correlation between the co-located CU and the current CU is participated,a linear relationship between the correlation and the inter-prediction mode is extablished,and the prediction of the inter-mode is guided.Finally,the calculation of the algorithm is optimized and the amount of calculation of inter prediction is reduced by the fusion of the two methods.By comparing the algorithm with HM14.0 through experiments,the video quality is basically unchanged under the condition that the peak signal-to-noise ratio loss is small,and the coding time is reduced by more than 30%.