使用交互式编解码机制的分布式视频编码研究

Research of distributed video coding using interactive encoding and decoding schemes

为了克服Slepian-Wolf编码不存在统一编码以及采用的无记忆信道模型不符合实际等问题,运用交互式编解码(IED)方式,建立了统一编码,构建了有记忆的有限状态信道(FSC)模型,同时设计了一种适合FSC的用于LDPC解码的置信传播算法。实验结果表明,实现后的IED相比非IED具有更低的误码率(BER),且与理论极限码率更加逼近,实际视频序列的测试结果显示,实现的IED分布式视频编码系统较LDPC算法有2dB左右的率失真性能增益。

Because there is no universal Slepian-Wolf coding,and the memoryless channel model can not correspond with the actual needs,the interactive encoding and decoding(IED)schemes are used to establish universal coding and memory finite state channel(FSC)model.A belief propagation(BP)decoding algorithm is proposed for low density parity-check(LDPC)decoding,which is modeled as a FSC.Experiments results show that the bit error rate(BER)of IED schemes is lower than that of not-IED schemes and the gap between rate an...