【Key words】 digital watermarking； discrete cosine transform； scrambling； polarity matrix； blind extracting；
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In the view of current research status and problems, we focus on how to select the location of the watermark, how to adopt embedded strategies and blind extracting method.
针对当前的研究现状和存在的问题,重点讨论了如何选择水印的嵌入位置、如何采取嵌入策略和水印的盲提取方法。
参考来源 - 数字图像水印技术及其算法的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
The primitive image isn't needed when the watermarking is extracted, named as blind extracting.
该算法在进行水印检测时不需要原始图像，属于盲检测。
During information extracting, the algorithm can restore the original engineering drawing accurately, and meets the requirements of high-precision machining, and also realizes the blind extraction.
提取时可以精确地恢复原始工程图，满足了工程图加工精度高的要求，并且实现了盲提取。
The blind watermark was realized as the original image don't be needed when extracting watermark.
在提取水印时，不需要原始图像，完全实现了盲水印提取。
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