基于JPEG XR的半脆弱数字水印技术研究

Research of Semi-fragile Digital Watermarking Based on JPEG XR

研究并实现基于JPEG XR图像稳定性和内容认证的半脆弱数字水印技术。对JPEG XR图像的频率结构和码流结构进行了分析和研究,提取码流中每个分割块的DC系数和LP系数构造基于图像的二值信息,作为数字水印置乱后嵌入到原图像对应像素点YUV色彩空间的Y分量的最低有效位中,然后再对含有水印的图像进行JPEG XR再编码实现水印嵌入。通过比较基于图像的二值信息和嵌入在图像的二值水印信息,进行篡改定位。对含水印图像进行压缩、噪声、剪切等常见攻击实验,结果表明具有较好的稳定性和内容认证能力。

The semi-fragile digital watermarking technology for stability and content authentication is researched and realized based on the JPEG XR image. Frequency structure and code stream structure of JPEG XR image arc analyzed and researched, fetching DC coefficients and the LP coefficients of every tile in code streanl to construct binary information based on image, which are embedded in the least significant bit of the Y component of YUV color space as digital watermarking corresponding to pixels of original image after scrambled, and then the image contained watermark is encoded by JPEG XR again. Binary information based on image is compared with binary watermark information embedded in image ,and position tampered is found. The com- mon attacks experiments show that the technique has better stability and better content authentication with compression, noise, shear and so on.