摘要
本文提出了一种用于版权通知和保护的遥感图像数字水印算法。算法以灰度图像作为可见水印及不可见水印,首先在空域中对遥感图像进行可见水印的嵌入,以实现版权通知功能;然后对图像进行小波变换,在小波域中嵌入不可见水印,以实现版权保护功能。水印提取采用与嵌入相同的逆过程,得到置乱的水印图像,采用一种新的Arnold反变换方法对水印进行反置乱,最终得到嵌入的水印图像。实验表明,嵌入的可见水印很难去除,不可见水印对图像的质量影响很小,并对常规处理具有较好的鲁棒性。
This paper presents a digital watermarking algorithm for copyright notification and protection of remote sensing image. The algorithm takes a gray image as both visible and invisible watermarks. Firstly the visible watermark is embedded in spatial domain to realize copyright notification; The same watermark is then embedded in frequent domain as invisible watermark using DWT to realize copyright protection. The extract is totally contrary to the embedding, which can get a disorderly watermark. It can be ordered by a new anti-Arnold transformation. At last the watermark is obtained. Experiment shows that the visible watermark can hardly be ridden and the invisible watermark makes little difference. Meanwhile, the algorithm has good robustness to normal image processing.
出处
《遥感信息》
CSCD
2007年第3期25-28,共4页
Remote Sensing Information
