【摘要】 在一组正交向量中,向量与自己的内标积为1,向量之间的内标积为0,利用这一特性,对多个水印信息分别进行扩频调制,将调制后的信息线性组合后嵌入到载体中,使得多个水印在嵌入和提取时互不影响;多个水印可以分多次嵌入到载体图像中,先后嵌入的水印是彼此无关的,从而解决多水印算法中嵌入的水印信息之间相互干扰的问题,为数字图像产品的多著作权的保护提供了一种有效手段。实验表明,该算法对于噪声、旋转、缩放和JPEG压缩等常见攻击有良好的鲁棒性。更多还原

【Abstract】 In a group of orthogonal vectors,a vector’s standard product is 1 with itself while 0 with others.With this property,watermark information is spread spectrum by vector from orthogonal vectors,then multiple watermark information are linear compounded and embedded as a single information,watermark information can be detected anytime without impacted by other embedded watermark.Also multiple watermark information can be embedded in different time,the later embedded one dosen’t impact previous watermark.So it’s a good way to protect multiple copyrights.Experiment shows that the algorithm is resist in common watermarking attacks suck as noise,rotate,resize and JPEG compression.更多还原