数字地图水印算法的研究与应用

Study and Application of Watermarking Algorithm of Digital Map

随着通信技术和计算机网络技术的发展,数字作品很容易得到,同时,由此引发的防止盗版和保护版权的问题已引起人们的关注,数字水印技术是解决这些问题的有效的技术手段。通过对数字水印算法的研究和讨论,实现了DCT变换域的数字水印算法,并进行了相应的鲁棒性测试。首先介绍了目前信息隐藏技术的发展背景、概念、特征及通用模型,然后着重介绍了变换域内的水印,最后在此基础上讨论了基于DCT变换的数字水印技术。并借助MATLAB编程使这种算法得以实现,实验结果表明,这种方法具有很好的鲁棒性。

With the development of computer networks and the communication technology,digital work may be obtained easily,at the same time care is taken to protect copyright of these work and prevent the pirate.So,digital watermark technique is brought forward to protect the legitimate right of owner of work.On the base of research and discussion of digital watermarking algorithms,designs and real-izes digital watermark algorithm in DCT transform domain,and the robustness is also tested.Firstly,the background of data-hiding research is surveyed.Then we introduce the conceptions,characteristics and the general model of information hiding,together with the data hiding methods based on the spectral analysis.And finally,pay attention to the Digital Watermarking approach based on DCT.And realize this al-gorithm with MATLAB.The experiment result shows that,the algorithm has a good robustness to resist the attacks.