摘要
由于图像水印系统和通信系统的模式具有相似性 ,提出了一种基于 LDPC码的图像数字水印算法。该算法利用 LDPC码的纠错性能和人眼视觉特性 ,以实现静止图像中数字水印的嵌入和提取 ;在水印嵌入之前 ,对水印序列进行 LDPC码编码 ,然后把水印嵌入到符合人眼视觉特性的小波域中 ,并采用了 LDPC迭代译码算法进行水印提取 ,最后进行了仿真实验。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视觉不可见性。
Based on the analysis of the equivalent channel in the digital waterma rking system, a watermarking algorithm for digital image on the basis of LDPC co de is proposed in this paper. The algorithm embeds and retrieves the watermark s ignature into and out of the static image by employing the LDPC code technology and the human visual characteristics. The watermark is first LDPC coded and embe dded into the host image, then retrieved from the watermarked image using LDPC i terative methods. Finally, a simulation experiment is performed. The results dem onstrate that the proposed algorithm has greatly decreased the error code rate o f the retrieved watermark and improved the robustness and invisibility.
出处
《交通与计算机》
2005年第1期93-95,共3页
Computer and Communications
