一种基于DCT系数间线性关系的盲检数字水印算法

Digital Image Watermarking Based on the Lineal Relation Among the DCT Coefficients

为了提高盲检测数字水印算法的鲁棒性 ,从同频 DCT系数间的线性关系着手 ,结合人类视觉系统 (HVS)理论和 JPEG压缩的工作原理 ,提出了一种简单易行数字水印算法 .该算法具有良好的不可见性 ,能很好地抵抗 JPEG压缩 ,是完全意义上的盲检测算法 .并通过与口令系统结合 ,使只有合法用户才可正确检测出水印 .

To improve the Robustness of the blind detecting digital image watermarking algorithm, We study the the theory of HVS(humen vision system) and the JPEG compress method ,and propose a new watermarking algorithm based on the relation among the DCT coefficients with the same frequency , which has good quality.The experiment prove that this algorithm is good at invisiblity and robustness.The most information of watermark can survive after the attack such as JPEG compressing..While detecting watermark,this algorithm need neither the original image or the orignal watermark image.So it is a real blind detecting algorthm .