【摘要】 针对商品包装图像在水印检测过程中图像会发生变形的问题展开研究,提出一种基于混合变换域的盲数字水印算法。算法基于第二代数字水印思想,采用了量化技术,将水印信息嵌入到代表图像内容的重要特征值上,解决了水印图像随商品外形发生变形后水印的检测问题。实验结果表明,新的算法在保证水印不可见性的同时,实现了盲检测,且提取效果好,对于常见的图像旋转,平移、剪切和扭曲等攻击具有鲁棒性。更多还原

【Abstract】 A mixed blind algorithm of watermarking based on frequency domain is offered, which combines discrete wavelet transformation and discrete cosine transformation to solve the problem of the collection of watermark when the distortion occurs with the change of the external shape of the picture.The experimental result indicate that the algorithm has the features of watermark imperceptibility, good collection and robustness.更多还原