面向无线网络的可伸缩视频编码传输策略*

针对现有面向无线网络的可伸缩视频编码(Scalable Video Coding, SVC)传输策略未能充分考虑失真和能耗的问题，提出了一种基于失真和节点能耗最小化的SVC传输策略。该策略在分析SVC的编码失真、传输过程中的丢包失真的基础上，计算了接收端的视频失真总和；通过计算SVC传输系统的功率，对无线网络中的节点能耗进行了分析。然后综合考虑了能耗、传输时间及质量要求，将SVC的传输策略转化为一个优化问题，进而得到最优的SVC编码参数，在获得较优视频质量的前提下实现了SVC的可靠传输。仿真实验结果表明，与目前典型的SVC传输策略相比，该策略不但有效降低了SVC传输过程中的平均失真，而且在相同的能量消耗水平下，获得了更好的视频质量。

SVC transmission scheme over wireless networks

For the conventional transmission schemes for scalable video coding over wireless networks without take into account the distortion and energy consumption, this paper proposed a SVC transmission scheme based on minimizing the distortion and energy consumption. The scheme calculated the total video distortion according to distortion which caused by coding process and packet loss event, and analyzed the energy consumption of nodes based on the power of transmission system. Then it formulated the SVC transmission scheme as an optimization problem subject to the transmission energy consumption, time and quality constraints, and the coding parameters were obtained by solving the problem. Simulation results reveal that the proposed scheme reduce the average distortion, and achieves notable video quality improvements under the same energy consumption, compared with the typical conventional scheme.