为了在限定带宽下得到更好的编码效率和视频质量,在对现有的感兴趣区域(Regions O f Interest,RO I)可伸缩编码进行分析的基础上,提出了一种利用H.264框架下的灵活宏块排序(Flexib leMacrob lock O rdering,FMO)特性实现基于RO I的分层...为了在限定带宽下得到更好的编码效率和视频质量,在对现有的感兴趣区域(Regions O f Interest,RO I)可伸缩编码进行分析的基础上,提出了一种利用H.264框架下的灵活宏块排序(Flexib leMacrob lock O rdering,FMO)特性实现基于RO I的分层可伸缩编码方法。该方法通过改善低带宽下RO I优先编码传输方式及时空域码流分配方案,克服了现有的RO I编码方法带来的边界效应和运动错位现象,在增强视频的整体主观质量的同时提高了码流的可伸缩性。仿真和统计试验结果表明,在较低带宽下,所提出的方法在编码性能和主观视觉效果上有较大的改善。展开更多
To achieve an optimal trade-off between video quality and energy efficiency in the uplink streaming of multi-user Scalable Video Coding (SVC) videos in relay-based Orthogonal Frequency Division Multiple Access (OFDMA)...To achieve an optimal trade-off between video quality and energy efficiency in the uplink streaming of multi-user Scalable Video Coding (SVC) videos in relay-based Orthogonal Frequency Division Multiple Access (OFDMA) cellular networks, a cross-layer design framework that jointly selects the Transmission Policy (TP) for SVC video frames, assigns OFDMA subcarriers, and allocates power for each subcarrier is proposed. We apply the dual decomposition method to the problem, and obtain a TP selection subproblem for each SVC video adaptation and a resource allocation subproblem of Joint Subcarrier, Relay and Power Allocation (JSRPA). A second level of dual decomposition is used to divide the JSRPA problem into independent subcarrier subproblems. The proposed Crosslayer Trade-off Optimization (CTO) algorithm is sub-distributed with significantly low complexity. A performance evaluation with typical SVC video traces demonstrates that the proposed algorithm is able to converge and efficiently achieve the optimal trade-off between the video quality and energy consumption at the MSs for uplink SVC streaming.展开更多
文摘为了在限定带宽下得到更好的编码效率和视频质量,在对现有的感兴趣区域(Regions O f Interest,RO I)可伸缩编码进行分析的基础上,提出了一种利用H.264框架下的灵活宏块排序(Flexib leMacrob lock O rdering,FMO)特性实现基于RO I的分层可伸缩编码方法。该方法通过改善低带宽下RO I优先编码传输方式及时空域码流分配方案,克服了现有的RO I编码方法带来的边界效应和运动错位现象,在增强视频的整体主观质量的同时提高了码流的可伸缩性。仿真和统计试验结果表明,在较低带宽下,所提出的方法在编码性能和主观视觉效果上有较大的改善。
基金partially supported by the National Natural Science Foundation of China under Grants No. 610202380, No. 60932007Major Program of National Natural Science Foundation of China under Grant No. 60932007+2 种基金Tianjin Research Program of Application Foundation and Advanced Technology under Grant No. 12JCQNJC00300Research Fund for the Doctoral Program of Higher Education of China under Grant No. 20110032120029the Innovation Foundation of Tianjin University
文摘To achieve an optimal trade-off between video quality and energy efficiency in the uplink streaming of multi-user Scalable Video Coding (SVC) videos in relay-based Orthogonal Frequency Division Multiple Access (OFDMA) cellular networks, a cross-layer design framework that jointly selects the Transmission Policy (TP) for SVC video frames, assigns OFDMA subcarriers, and allocates power for each subcarrier is proposed. We apply the dual decomposition method to the problem, and obtain a TP selection subproblem for each SVC video adaptation and a resource allocation subproblem of Joint Subcarrier, Relay and Power Allocation (JSRPA). A second level of dual decomposition is used to divide the JSRPA problem into independent subcarrier subproblems. The proposed Crosslayer Trade-off Optimization (CTO) algorithm is sub-distributed with significantly low complexity. A performance evaluation with typical SVC video traces demonstrates that the proposed algorithm is able to converge and efficiently achieve the optimal trade-off between the video quality and energy consumption at the MSs for uplink SVC streaming.
