应用于JPEG XR的半脆弱数字水印技术

应用于JPEG XR的半脆弱数字水印技术

朱海华

【期刊名称】《小型微型计算机系统》

【年(卷),期】2013(034)004

【摘要】对JPEG XR的编解码过程、频率结构和码流结构进行分析和研究,提出一种半脆弱数字水印技术实现图像的鲁棒性认证和内容认证.提取频率模式码流的DC系数和低通系数构造基于图像的二值数字水印,置乱后嵌入到JPEG XR 解码后的图像对应像素的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编码实现水印嵌入.对基于图像的二值信息和嵌入在图像的二值水印信息比较实现篡改定位.通过篡改定位实验及压缩、噪声、剪切等常见攻击方式实验,结果表明该半脆弱数字水印具有较好的鲁棒性和内容认证能力.%Analysing and researching encode and decode process, frequency structure and code stream structure of JPEG XR, Putting forward a semi-fragile digital watermarking technology for robust authentication and content authentication based on the JPEG XR image. Fetching DC coefficients and the LP coefficients in code stream to construct binary information based on image as digital water marking, which are scrambled and embedded the least significant bit of the Y component of corresponding to pixels of decoded JPEG XR image, and then encoding the image contained watermark by JPEG XR. Comparisons binary information based on image with bi nary watermark information embedded in image find position tampered. The position tampered