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中文摘要：
数字水印技术是多媒体信息安全领域的一个重要的研究课题。提出了一种基于DCT域的盲水印算法，该算法将图像经DCT变换后进行8×8分块，然后将二值水印嵌入到每一个图像分块的中频系数中。在嵌入过程中利用每一块的中频系数的性质，自适应的确定嵌入强度，从而保证了所嵌入的水印对一些常用的图像处理操作具有很强的鲁棒性。实验结果验证了提出方法的有效性。
英文摘要：
Digital watermark technique is one of the most active research topics in the safety field of multimedia information. A novel oblivious image watermarking algorithm based on DCT is proposed. The host gray-level image is firstly DCT transformed, and divided into 8x 8 blocks. Then the binary watermarking is embedded into the coefficients of the middle fi＇equency band of each block. During the above process, the strength of the watermarking is quantized adaptively according to the characteristics of the embedded coefficients of each block. The algorithm has very strong robustness for some common image processing operations. Simulation results show it is effective.
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