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基于JPEG2000和WIPCLDPC的联合信源信道编码

DOI: 10.11834/jig.20080603

Keywords: 联合信源信道编码,JPEG2000,非规则LDPC,不等错误保护,等错误保护

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Abstract:

提出了一种联合信源信道编码(JSCC)方案。首先,构造了一种具有重量递增奇偶校验矩阵的非规则LDPC码(WIPCLDPC),实现非规则LDPC(IrregularLDPC)码比特节点按列重递增的顺序排列。然后,针对JPEG2000码流分层结构的特点,把不同质量层的JPEG2000码流成功地映射到WIPCLDPC不同度数的比特节点上,以达到对不同重要级别码流的不等错误保护(UEP),从而达到优化重建图像质量和视觉效果的目的。仿真结果表明,与采用随机构造校验矩阵的非规则LDPC码进行等错误保护(EEP),以及采用RCPC、RS码进行不等错误保护的JPEG2000码流相比,JSCC方案提高了重建图像的PSNR,改善了重建图像的主观视觉效果。

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