中文摘要：

为了在分布式视频编码（DVC）中取得更好的压缩性能，将校验节点的合并和分裂进行有机结合，提出了一种码率自适应LDPC（RALDPC）编码新方法。该方法首先基于PEG算法构造高压缩比LDPC码字；然后由行均匀分裂得到低压缩比码字；最后通过合并或分裂校验矩阵对应的行来适度调整码率。为保证码字性能，还提出了校验节点合并的3个限制条件，并基于RALDPC提出了一种码率自适应DVC编码方案。实验结果表明，与当前基于Turbo码的DVC方案相比，在原信息和边信息高度或中度相关时，编码性能提高了0．1～0．7dB。

英文摘要：

In order to achieve better rate distortion （RD） performance in distributed video coding （DVC）, a new rate- adaptive 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.TdB compared to DVC algorithm based on the popular Turbo codes, when the correlation between the original and side information is medium or high.