一种双重内容认证的数字水印新算法

A Duple Integrity Verification Algorithm Based on Watermarking

通过同时嵌入鲁棒性水印和易损水印,提出了一种复合型数字水印算法,该方法具有以下特性:图像数据与验证数据浑然一体;不但能检测出图像是否被篡改、缩放、剪切,还能定位被篡改象素块的位置;能检测并定位出图像内子块与子块之间的偷换、图像与图像之间的子块偷换、嫁接等,而且实现了盲提取。实验证明,算法在用于版权保护的同时还能对篡改进行准确的检测,可以有效抵抗擦除或伪造易损水印的攻击。

Through using embedding robust watermark and fragile watermark in one image simultaneously, this paper brings forward an algorithm of compound, which has some specialities ： any changes of pixel values and changes in image size due to sealing or cropping, block swapping in images or corresponding block swapping between images can be detected and located, and not needing the original image when extracting the watermarking data. Simulation results show that the algorithm can convey ownership and verify content integrity, can robust to erasure or forge fragile watermark.