摘要
数字水印是解决信息安全和版权保护的有效方法 ,已成为多媒体信息安全领域的热门技术。本文提出一种利用通讯中汉明码原理来提高提取水印正确率的水印嵌入算法。为提高水印抗压缩能力 ,该算法是在离散余弦变换 (DCT)域实现的。仿真结果表明 ,该水印算法既满足不可见性又有较强的鲁棒性 (JPEG压缩比约为 10时 ,所提取水印归一化相关系数 NC≥ 0 .80 ,含水印图像峰值信噪比 PSNR≥ 40 d B)
Digital watermarking is an effective method to resolve problems of information security and copyright protection. It has been a hot technology in the field of multimedia information security. This article proposes a watermark embedding algorithm based on Hamming code,which can improve the correction of extracted watermarks. It performs the embedding process in DCT domain in order to improve the robustness against compression. The experimental results indicate the watermarks are transparent and robust in the algorithms(the extracted watermark's NC≥0.80, the watermarked image's PSNR≥40dB under the condition that the JPEG compression ratio is about 10).
