The Rate Distortion Optimization(RDO)algorithm in High Efficiency Video Coding(HEVC)has many iterations and a large number of calculations.In order to decrease the calculation time and meet the requirements of fast sw...The Rate Distortion Optimization(RDO)algorithm in High Efficiency Video Coding(HEVC)has many iterations and a large number of calculations.In order to decrease the calculation time and meet the requirements of fast switching of RDO algorithms of different scales,an RDO dynamic reconfigurable structure is proposed.First,the Quantization Parameter(QP)and bit rate values were loaded through an H⁃tree Configurable Network(HCN),and the execution status of the array was detected in real time.When the switching request of the RDO algorithm was detected,the corresponding configuration information was delivered.This self⁃reconfiguration implementation method improved the flexibility and utilization of hardware.Experimental results show that when the control bit width was only increased by 31.25%,the designed configuration network could increase the number of controllable processing units by 32 times,and the execution cycle was 50%lower than the same type of design.Compared with previous RDO algorithm,the RDO algorithm implemented on the reconfigurable array based on the configuration network had an average operating frequency increase of 12.5%and an area reduction of 56.4%.展开更多
H.264 improves the coding efficiency by adopting rate distortion optimization (RDO); however,it yields high computa-tional complexity. In order to reduce the intra-frame coding time,a fast and effective intra-predicti...H.264 improves the coding efficiency by adopting rate distortion optimization (RDO); however,it yields high computa-tional complexity. In order to reduce the intra-frame coding time,a fast and effective intra-prediction mode selection algorithm is proposed. The minimum sum of absolute differences between sub-block and its marginal weighted-pixels are used for selecting the candidates of prediction modes to speed up the intra-prediction process with an early termination criterion. Experimental results show that the proposed method can reduce the encoding time by more than 63% comparing with JM (Joint Model) software and is better than the previous algorithms,with negligible loss of coding performance.展开更多
传统编码器虽然具有可控的码率,但却无法有效控制编码视频的质量,存在随图像内容变化而产生抖动的缺陷。针对当前互联网带宽特性,如自适应码率(Adaptive Bitrate,ABR)网络带宽控制技术中带宽固定的限制条件比传统广播网松弛,在以失真为...传统编码器虽然具有可控的码率,但却无法有效控制编码视频的质量,存在随图像内容变化而产生抖动的缺陷。针对当前互联网带宽特性,如自适应码率(Adaptive Bitrate,ABR)网络带宽控制技术中带宽固定的限制条件比传统广播网松弛,在以失真为约束的条件下,提出了一种新的率失真优化的失真分配方案,根据每个编码单元的拉格朗日乘子与图像组(Group of Pictures,GOP)级别的乘子之间的相互关系模型,设计了以帧级为单元的失真分配策略。基于高效率视频编码(High Efficiency Video Coding,HEVC)模型随机编码结构的默认配置下,对通用测试条件中规定的标准测试序列,实验结果显示质量一致性限制的编码器率失真性能Bj ntegaard Delta-Peak Signal to Noise Rate(BD-PSNR)提升了0.057 dB,编码后的图像组失真的方差减小了50%,能有效地减少编码视频的质量抖动,具有更加平稳的编码质量。展开更多
基金Sponsored by the National Natural Science Foundation of China(Grant Nos.61834005,61772417,61802304,61602377,and 61634004)the Shaanxi Province Coordination Innovation Project of Science and Technology(Grant No.2016KTZDGY02-04-02)+1 种基金the Shaanxi Provincial Key R&D Plan(Grant No.2017GY-060)the Shaanxi International Science and Technology Cooperation Program(Grant No.2018KW-006).
文摘The Rate Distortion Optimization(RDO)algorithm in High Efficiency Video Coding(HEVC)has many iterations and a large number of calculations.In order to decrease the calculation time and meet the requirements of fast switching of RDO algorithms of different scales,an RDO dynamic reconfigurable structure is proposed.First,the Quantization Parameter(QP)and bit rate values were loaded through an H⁃tree Configurable Network(HCN),and the execution status of the array was detected in real time.When the switching request of the RDO algorithm was detected,the corresponding configuration information was delivered.This self⁃reconfiguration implementation method improved the flexibility and utilization of hardware.Experimental results show that when the control bit width was only increased by 31.25%,the designed configuration network could increase the number of controllable processing units by 32 times,and the execution cycle was 50%lower than the same type of design.Compared with previous RDO algorithm,the RDO algorithm implemented on the reconfigurable array based on the configuration network had an average operating frequency increase of 12.5%and an area reduction of 56.4%.
基金Supported by the National High Technology Research and Development Program of China (863 Program) (2006AA040307)
文摘H.264 improves the coding efficiency by adopting rate distortion optimization (RDO); however,it yields high computa-tional complexity. In order to reduce the intra-frame coding time,a fast and effective intra-prediction mode selection algorithm is proposed. The minimum sum of absolute differences between sub-block and its marginal weighted-pixels are used for selecting the candidates of prediction modes to speed up the intra-prediction process with an early termination criterion. Experimental results show that the proposed method can reduce the encoding time by more than 63% comparing with JM (Joint Model) software and is better than the previous algorithms,with negligible loss of coding performance.
文摘传统编码器虽然具有可控的码率,但却无法有效控制编码视频的质量,存在随图像内容变化而产生抖动的缺陷。针对当前互联网带宽特性,如自适应码率(Adaptive Bitrate,ABR)网络带宽控制技术中带宽固定的限制条件比传统广播网松弛,在以失真为约束的条件下,提出了一种新的率失真优化的失真分配方案,根据每个编码单元的拉格朗日乘子与图像组(Group of Pictures,GOP)级别的乘子之间的相互关系模型,设计了以帧级为单元的失真分配策略。基于高效率视频编码(High Efficiency Video Coding,HEVC)模型随机编码结构的默认配置下,对通用测试条件中规定的标准测试序列,实验结果显示质量一致性限制的编码器率失真性能Bj ntegaard Delta-Peak Signal to Noise Rate(BD-PSNR)提升了0.057 dB,编码后的图像组失真的方差减小了50%,能有效地减少编码视频的质量抖动,具有更加平稳的编码质量。
