第二个方面主要研究如何利用多水印嵌入技术来提高鲁棒性。该方法是一个新的提高水印技术鲁棒性的方法。
The second one focuses on how to improve the robustness of the watermarking technique by employing the multiple watermarks technique, which is a new way leading to the improvement of robustness.
研究了多类数字水印同时嵌入的问题，提出了一种同时嵌入两类水印的图像数字水印算法。
It is studied that the problems in embedding multiple watermarks simultaneously, and proposed an image watermarking scheme which embedded fragile and robust watermarks at the same time.
该方法利用了阈值t来控制水印的嵌入位置，在保证图像质量的前提下，嵌入尽可能多的数据。
This method USES a threshold t to choose the blocks of halftone image to imbed information, which imbeds data as many as possible under the guarantee of the quality of the halftone image.
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