用于JPEG2000图像认证的鲁棒性水印算法

针对JPEG2000图像压缩标准所具有的渐进传输、一次编码多次解码等特性,提出了一种基于图像特征的鲁棒性图像认证算法.该算法在JPEG2000编码过程中,先根据图像不变特征,生成认证水印,再根据实际的鲁棒性认证需求,在量化后的小波系数中确定每个子带的认证水印嵌入位平面,最后基于小波系数位平面的特征嵌入认证水印.算法不仅能适应JPEG2000各种灵活的编码方式,还能定位图像篡改的位置.实验结果验证了图像认证算法对可允许图像操作的鲁棒性以及对图像篡改的敏感性.

A Robust Watermarking Scheme for JPEG2000 Image Authentication

Aiming to the characteristics of JPEG2000 image compression standard such as progressive transmission,encode once and decode many times et al.,a feature-based robust image authentication scheme is proposed in this paper.Firstly,authentication data are generated based on invariant features of the image in codec.Then embedding bit planes of every subbands are determined based on actual authentication requirements.Finally, authentication data are embedded into bit planes based on features of wavelet coefficient bit planes.The proposed scheme can not only incorporate with JPEG2000 codec,and also can locate the tampered positions.Experimental results demonstrate the merits of the proposed scheme.