基于参考单元编码失真时域影响的率失真优化算法  

Rate-distortion optimization algorithm based on temporal impact ofreference unit coding distortion

作　　者：黄敏峰 王乐才 邓米雪 盛剑锋 王梨名 杨栩 Huang Minfeng;Wang Lecai;Deng Mixue;Sheng Jianfeng;Wang Liming;Yang Xu(China Mobile(Hangzhou)Information Technology Co.,Ltd.,Hangzhou 311100,China;School of Physics&Engineering Technology,Chengdu Normal University,Chengdu 611130,China)

机构地区：[1]中移(杭州)信息技术有限公司,杭州311100 [2]成都师范学院物理与工程技术学院,成都611130

出　　处：《计算机应用研究》2024年第11期3515-3520,共6页Application Research of Computers

基　　金：国家自然科学基金项目(62020106011,U19A2052,62061015,62171257,U22B2001)。

摘　　要：针对通用视频编码标准H.266/VVC的独立率失真优化技术未考虑参考单元编码失真的时域传播影响而损失编码性能的问题,提出一种基于编码失真时域传播影响的低延时率失真优化算法。首先,根据视频图像的时域连续性特征,由运动补偿预测误差及重建误差来计算编码失真的时域传播影响权重;其次,建立基于编码失真时域传播影响的率失真优化模型;最后,将编码失真的时域传播影响权重用于调整编码单元的拉格朗日乘子及量化参数。实验结果显示,在低延时P帧和B帧配置下,相较于基准算法,BD-rate码率节省分别达到1.6%和0.9%,编码时间分别下降2.93%和6.02%。实验结果表明,该算法在不增加编码复杂度的条件下有效提升了编码性能,适用于实时编码应用场景。The independent rate-distortion optimization technique for the video coding standard H.266/VVC(versatile video coding)suffers from a loss in coding performance due to the oversight of temporal propagation effects of coding distortion in reference unit.To address this issue,this paper proposed a low-latency rate-distortion optimization algorithm based on the temporal influence of coding distortion.Firstly,leveraging the temporal propagation continuity characteristics of video images,it computed the temporal propagation influence weight of encoding distortion by considering motion compensation prediction errors and reconstruction errors.Secondly,it established a rate-distortion optimization model based on the temporal propagation impact of encoding distortion.Lastly,it utilized the temporal propagation influence weight of encoding distortion to adjust the Lagrange multipliers and quantization parameters of coding units.Experimental results demonstrate that,under low-delay P-frame and B-frame configurations,compared to the baseline algorithm,the BD-rate savings reach 1.6%and 0.9%,and the coding time decrease by 2.93%and 6.02%,respectively.The experimental results demonstrate that the algorithm proposed in this paper effectively improves coding performance without increasing encoding complexity,making it suitable for real-time encoding applications.

关 键 词：编码失真 拉格朗日乘子 率失真优化 量化参数 VVC 

分 类 号：TN919.81[电子电信—通信与信息系统]