【摘要】 可伸缩视频编码可以根据信道波动的情况传输部分码流获取较低的视频质量以适应无线信道的波动。在满足信道传输速率的约束条件下,给出了率失真意义下联合优化多进制正交调幅子信道分配、可伸缩视频编码的传输层数以及各层的信道编码保护级别的视频传输算法。实验结果表明,在加性高斯白噪声信道下,与等重保护且不考虑多进制正交调幅子信道差异的机制相比,该传输方案能够取得平均1.5~2 dB的解码增益,显著提高了可伸缩视频码流无线传输的鲁棒性。更多还原

【Abstract】 Scalable video coding has the ability to transmit partial bit streams which can be used to reconstruct lower quality video according to the channel status to adapt to channel quality fluctuations.A rate-distortion optimized wireless video streaming algorithm was developed which considers the allocation of multiple quadrature amplitude modulation(M-QAM) sub-channels,the number of scalable video layers,and the channel coding protection priorities for various layers.Comparisons with the equal error protection(EEP) without consideration of prioritized sub-channels show that the algorithm provides 1.5-2 dB gain with robust video streaming over wireless channels.更多还原