In this paper, a dual color image watermarking algorithm is proposed based on the research of color digital watermark.

本文对彩色水印技术进行了详细地研究，提出了一种双彩色数字水印方案。

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In this paper, a spread spectrum digital watermark based on Gaussian pyramid decomposition was proposed.

提出了一种基于高斯金字塔分解的数字图像扩频水印技术。

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The concepts and theory about digital watermark are introduced in this paper. A kind of fragile watermark technology is given by means of digital image scrambling technology.

本文概括地介绍了数字水印技术的概念及原理，并利用数字图像置乱技术，给出了一种脆弱数字水印技术。

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He said stores should check the quality of the paper and printing, as well as the metallic security thread and watermark.

BBC: Counterfeit notes warning for East Lothian shopkeepers