用于JPEG2000图像认证的半脆弱性数字水印算法

Semi-Fragile Watermarking for JPEG2000 Image Authentication

本文给出一种适用于JPEG2 0 0 0图像认证的半脆弱性数字水印算法 ,该算法与JPEG2 0 0 0编、解码器相结合 ,它根据JPEG2 0 0 0图像压缩过程中的不变参量进行水印生成和嵌入调制 ,利用小波变换特性对图像篡改区域进行定位 .实验表明 ,采用该算法实现的水印不仅具有良好的视觉透明性 ,而且还有较佳的篡改区域指示功能 .

In this paper,a semi-fragile watermarking algorithm is proposed for JPEG2000 image authentication.The algorithm is combined with the JPEG2000 image coding process.The watermark is generated and embedded based on an invariant property of DWT coefficients during the JPEG2000 compression.Once the watermarked image is tampered,the alteration regions can be located according to primary properties of the wavelet transform.The experimental results demonstrate that the watermarked image possesses good perceptual transparence,and that the proposed algorithm can detect any change to the watermarked JPEG2000 image as well as locate the tampered areas.