不规则LDPC码在数字水印中的应用

Application of irregular LDPC code in digital watermarking

数字水印在传播过程中会受到信道的干扰,而不规则LDPC码在信道纠错方面有不错的性能,可将不规则LDPC码与数字水印技术相结合,先对数字水印进行LDPC编码,然后对宿主图像进行小波变换和SVD分解,将水印嵌入。实验结果表明,该算法降低了水印在传输过程中的误码率,具有很强的鲁棒性和不可见性。

Digital watermark is disturbed by channels noise in the course of transmission,while irregular LDPC code has strong error correcting capability.This paper combines irregular LDPC code and digital watermark technology,first,encoding the digital watermark with irregular LDPC code, second,presenting a wavelet transform and Singular Value Decomposition （SVD） to the host image,at last,embedding the watermark in the host image.Analysis and experimental results show that the new watermarking method reduces the error probability,performs well in both invisibility and robustness.