静态图像多维水印的并行嵌入和检测

数字水印已经成为多媒体数据产权保护的一种有效的解决方案，不可察觉性和鲁棒性是图像水印中基本要求，但它们却是一对互相制约的因素，在两者中间寻找一个平衡点，已经成为水印中的一个关键问题，本文提出了一种多维水印的方案，在图像的DCT域中，使用扩频技术并行地嵌 入互相独立的多维水印信号，可以在不增加水印信号幅度的情况下，提高水印的鲁棒性。

PARALLEL EMBEDDING AND DETECTION OF MULTIDI- MENSIONAL WATERMARK FOR STILL IMAGE

Digital watermarking has become one of the effective solutions to the protection of copyright of multimedia data. Imperceptibility and robustness, which are the basic requirements of digital watermark, conflict with each other. So, looking for a trade off of the pair has become one of the keys in watermarking. A scenario of multidimensional watermark for resolving rightful ownership of digital images was proposed in this paper. The multidimensional watermark, whose vectors are mutually independent, was embedded into image in the DCT domain in parallel by using spread spectrum technology. The robustness of multidimensional watermark was improved without enhancing the watermark energy.