基于图像内容可恢复的脆弱水印技术

提出了一种用于图像内容认证和保护的脆弱数字图像水印算法,该算法不仅可以检测定位出图像中内容的篡改,而且可以恢复被篡改的图像内容。算法用小波变换提取出图像的低频部分作为水印,然后再用RS纠错编码技术对水印进行编码,再利用置乱技术及加密技术将校验码处理后植入图像的最低有效位。实验结果证明该算法是比较有效的脆弱水印算法。

Image-Content-Based Fragile Watermarking with Restoration Capability

This paper gives an auto-restorable fragile watermarking algorithm for image content authentication, which can not only detect the location of any changes in images but also restore the altered image content. Firstly, the low frequents sector picked up by discrete wavelet transform(DWT) as watermarking. Then the RS correct-encode technology is used to encode the watermarking. Finally, the watermarking data are embed into the lowest bits of the image data after being changed with arnold shuffling techniques and chaotic encrypt tentechniques. Experimental results demonstrate that the watermarking algorithm is a valid fragile digital image watermarking algorithm.