基于双重数字水印的多媒体课件 版权申明与保护方法研究

提出了基于屏幕流彩色图像空间域和DCT频域的双重数字水印自适应嵌入算法。该算法在屏幕流彩色图像的空间域自适应地嵌入可见水印,并将二值不可见水印图像采用混沌序列加密,自适应地嵌入到屏幕流彩色图像的DCT域,形成含有双重数字水印的屏幕流彩色图像。系统测试结果表明,采用该算法嵌入的可见水印比较脆弱,适合多媒体课件的版权申明;嵌入的不可见水印具有较强的鲁棒性,可用于多媒体课件的版权保护。

Multimedia Courseware Copyright Notification and Protection Based on Dual Digital Watermark

Proposes a novel digital watermark solution for the color image of screen stream based on the spatial domain and the DCT domain. It embeds visible watermark into the spatial domain adaptively, and also embeds invisible watermark encrypted by chaotic sequence into the DCT domain to achieve protected screen color image with dual digital watermark embedded. The effectiveness and good results of this method in multimedia courseware have been testified that the visible watermark is frail to be suitable for copyright notification and the invisible watermark has good robustness for copyright protection.