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。
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.
出处
《计算机工程》
EI
CAS
CSCD
北大核心
2006年第4期174-176,共3页
Computer Engineering
