一种用于彩色图像认证的脆弱水印算法

提出了一种用于彩色图像认证的脆弱水印算法。这种算法是采用了均值量化的方法 ,把数字水印嵌入图像的离散小波域 ,可以检测在空间域和频率域的图像失真。利用脆弱数字水印算法提供的关于失真的估计信息 ,可以帮助用户判断图像内容的可靠程度。同时还采用了聚合篡改区域方法来完成失真检测 ,能够区分出恶意攻击和一般的图像处理。仿真结果证明 ,该方法可以提供图像修改的程度和修改区域的信息 ,其可信度比一般量化方法强。

A fragile watermarking scheme for color image authentication

A fragile watermarking technique for color image authentication was proposed. The watermark was embedded in the wavelet domain using the mean quantization method. This method can be used to detect the distortion both in spatial and frequency domain. This algorithm accomplishes the distortion detection by gathering the tamper areas to distinguish malicious attacks from incidental distortions. The information offered by the fragile watermarking technique can help users justify the creditability of the image. The simulation results demonstrate that this method can provide the modification degree of the original image and the information of the tamper areas, and the credibility of the method is superior to that of the conventional quantization-based method.