基于LDPC码的数字图像水印算法研究

The Studying of Digital Watermark Scheme Based on LDPC

传统的数字水印不具备抗比特攻击能力,本文提出一种基于LDPC码的数字水印算法,对水印图像编码,可抵御比特攻击。水印图像在进入高噪声信道前需要进行LDPC编码。本文给出了LDPC码的编码结构,可传播置信解码算法。通过仿真结果表明,该算法降低了水印图像在传输中的误码率,具有较强的鲁棒性。

It is difficult for classical watermarking technique to resist the bits attacking,this paper introduces Low-density parity check into the watermarking, watermarking image has been encoded by LDPC before it enter the high noise channel. The paper provides LDPC encoding structure and belief propagation decoding algorithm, and put forward an digital watermark scheme based on LDPC which consider the coding of watermark picture and original picture. Finally, we get the simulated experiment result：the arithmetic reduces the BER of watermark picture and original picture which are transmitted, and takes on the obvious robustness.