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为提高无线信道上可伸缩视频码流的传输效率,提出一种新的能量约束条件下可伸缩视频码流自适应传输算法。基于无线信道的Markov模型假设,在满足延时约束条件下,对各可伸缩视频编码帧的增强层数目以及信道发送速率进行联合优化,并给出了动态规划算法求解该约束优化问题。实验结果表明,相对于采用固定信道传输速率的可伸缩视频码流传输方案,该方案在达到相同平均视频质量时平均可节省44.95%~52.86%的能量,显著提高了无线信道上可伸缩视频传输的能量利用效率。
In order to improve the transmission efficiency of scalable video streams on wireless channels, a novel adaptive transmission algorithm for scalable video streams under energy constraints is proposed. Based on the Markov model of wireless channel, under the constraint of delay, the number of enhancement layers and the channel transmission rate of each scalable video coding frame are jointly optimized, and the dynamic programming algorithm is given to solve the constrained optimization problem. Experimental results show that this scheme can save an average of 44.95% ~ 52.86% of the energy when reaching the same average video quality compared with the scalable video bitstream transmission scheme with a fixed channel transmission rate, and significantly improve the scalable video transmission over the wireless channel Energy efficiency.