版权标识与篡改定位的数字图像水印方案

Semi-fragile Digital Watermarking Algorithm for Image Copyright Mark and Tamper Localization

针对JPEG图像提出了用于版权标识和篡改定位功能的图像水印算法。水印嵌入和提取算法基于JPEG图像解压缩后的像素矩阵进行。水印算法结合了JPEG压缩核心技术DCT变换系数进行版权标识水印和篡改定位水印的嵌入和提取处理过程。水印算法性能测试对象为银行票据图像,实验结果包括给出了水印算法的图像体积增幅比、PSNR值以及水印误比特率指标结果。实验结果表明,算法在版权标识和篡改定位方面均具有较好的实用性。

An innovative watermarking algorithm for the copyright mark and tamper localization of JPEG image is proposed. The DCT DC and AC coefficients of block image are used to embed the copyright mark and tamper localization. Bank notes images are used to verify algorithm performance indexes, including increasing ratio for image sizes, PSNR and bit error rate. The experimental results suggest the proposed scheme can achieve good excellent performance to image copyright mark and tamper localization.