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中文摘要：
水印对多种攻击的鲁棒性仍然没有得到很好的解决。针对单一水印在受到多种攻击时无法保证足够鲁棒性的问题，提出了一种DCT域的多重鲁棒水印算法。首先对原始图像进行采样，并把图像分成两组，采用两种不同的调制方式，即抖动调制和基于选择块的DCT系数调制嵌入有意义的二值图像水印。与已有算法相比，加水印图像可以获得更好的质量。在DCT的不同频率分量中嵌入水印，保证了水印图像在受到常见的各种攻击之后至少有一个清晰可见。实验结果表明了算法能有效地抵抗常见的信号处理攻击，并且当存在多种攻击的时候，至少有一个水印图像清晰可见，从而为版权保护提供证据。
英文摘要：
Watermark robustness to various kinds of attacks is still an problem. Usually, single watermark cannot guarantee enough robustness when several attacks are encountered at the same time. In order to solve the problem, a new multi-image watermarking algorithm is proposed in Discrete Cosine Transform （DCT） domain. The original image is first sub-sampled, and the sub-images are separated into two groups. Then binary watermark images are embedded by utilizing two kinds of modulations, i.e. dither modulation and DCT coefficient modulation based on selected blocks. Compared with existing methods, the proposed algorithm can obtain better image quality. As the watermark images are embedded at different frequency components, at least one watermark can survive common attacks, such as JPEG compression, wiener filtering, brightness and contrast enhancement. Experimental results show that the proposed scheme is efficient to.resist traditional signal processing attacks. At least one watermark can survive multi-attacks, which provide proof for copyright protection.
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