Rate adaptive distributed video coding based on LDPC
基于LDPC的码率自适应分布式视频编码

In order to achieve better rate distortion (RD) performance in distributed video coding (DVC), a new rateadaptive low density parity check (RALDPC) coding algorithm is proposed. Firstly, a high compression ratio code is constructed based on progressive edge-growth (PEG) algorithm. Then low compression ratio codes are obtained using row splitting algorithm. The rate can be well adjusted by merging and splitting the parity-check matrix rows. And three restriction conditions for merging check nodes are proposed in order to obtain good performance codes. Based on the RALDPC, a rate adaptive DVC algorithm is proposed, which can achieve better RD performance about 0.1~0.7dB compared to DVC algorithm based on the popular Turbo codes, when the correlation between the original and side information is medium or high.