提出一种新的文档图像多功能水印算法,首先生成依赖于用户身份信息与文档图像特征的数字指纹,然后在文档图像正交分离的两不同区域分别嵌入可擦除可见水印与数字指纹,通过嵌入可擦除可见水印权衡版权告示与用户浏览之间的冲突,利用数字指纹实现图像认证和追踪合法用户泄密行为。实验证实该方案是有效的和高安全的,没有正确密钥的用户无法有效去除可见水印。该方案可为互联网上文档图像资源通信存储提供版权保护与盗版追踪功能。

This paper proposes a documental images multi-purpose watermarking scheme. Firstly, a digital fingerprint sequence dependent of user information and image feature is generated. The visible watermark and digital fingerprint are embedded into two different orthogonal regions of host documental images. The removable visible watermark is used to balance the contradiction between the copyright notice and user browsing, and the digital fingerprint can authenticate documental image content and track illegal activities of authorized users. Experimental results show the effectiveness and high security of the scheme. Users without correct secret key cannot remove the visible watermark. It can protect copyright and trace traitor behaviors for storage and communication of documental images on the Internet.