基于率失真优化的HEVC帧内编码模式选择  

An HEVC intraframe coding mode selection based on RDO

作　　者：乔莉 李博[1] 刘伟杰 QIAO Li;LI Bo;LIU Weijie(Key Laboratory of Ministry of Education for Instrumentation Science ＆ Dynamic Measurement, North University of China, Taiyuan 030051, China)

机构地区：[1]中北大学仪器科学与动态测试教育部重点实验室,山西太原030051

出　　处：《现代电子技术》2018年第12期87-91,共5页Modern Electronics Technique

基　　金：国家自然科学基金项目(61471325)~~

摘　　要：针对高压缩率的视频编码算法产生的视频失真,引起视频感知效果下降的问题,提出一种基于率失真优化(RDO)的HEVC编码模式选择。HEVC的帧内预测模式采用基于块的多方向帧内预测方式,具有高达35种预测模式的帧内预测算法。在此使用率失真优化方法在众多的编码模式中选择出一种最优的模式,使得编码失真最小且编码输出码率最低。实验结果表明,基于率失真优化的HEVC帧内编码模式选择可以降低38.76%的编码复杂度,比特率增加0.834%,峰值信噪比(PSNR)下降0.043 d B。As the video coding algorithm with high compression rate has the video distortion problem and causes reduction of video perception effect,an HEVC coding mode selection based on rate distortion optimization（RDO） is proposed. In the HEVC intraframe prediction mode,the block-based multi-direction intraframe prediction method and an intraframe prediction algorithm with up to 35 prediction modes are adopted. The RDO method is adopted to select an optimal mode from various coding modes to minimize the distortion and output code rate of coding. The experimental results show that the HEVC intraframe coding mode selection based on RDO can reduce coding complexity by 38.76%,increase bit rate by 0.834%,and decrease peak signalto-noise ratio（PSNR）by 0.043 d B.

关 键 词：HEVC 帧内编码模式选择 拉格朗日代价 率失真优化 最优模式 编码复杂度 

分 类 号：TN919.81[电子电信—通信与信息系统]