以图像认证为目的,提出一种基于分形编码的脆弱性盲水印算法。该算法将认证水印嵌入分形变换域,又将分形编码参数作为水印嵌入到宿主图像中。算法能有效的检测图像是否被恶意篡改,并能定位篡改区域。通过提取嵌入在图像中的分形编码参数,还可以自动恢复被篡改区域。实验数据表明,算法可行有效,并且具有良好的篡改定位和恢复原图像的能力。

For image authentication, a fragile digital watermarking method is proposed. This method embeds watermarking into fractal transform, and embeds fractal coding parameters as watermark into the host image. It can not only locate altered areas, but also automatically recover the original image through extracting the fractal coding parameters. Experimental results show that the proposed method is capable of tamper localization, and effective for automatic recovery.