第三种算法是将前两种空域和变换域算法进行有效融合，从而提出了双重多功能性水印数字图像认证算法。

The third method is effective integrate the former two algorithms, which proposed dual watermarking algorithm for digital image authentication.

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目前已出现多种数字水印算法，典型的水印算法有空域算法、变换域算法、小波域算法、超小波域算法等。

There are so many digital watermark algorithms at present. The typical examples are the airspace algorithm, transform domain algorithm, wavelet domain algorithm and beyond wavelets algorithm.

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提出了对回波信道的初估计并利用变换域LMS算法进行信道跟踪的一种方案。

Echo channel estimation and the tracking of channel using the transform domain LMS algorithm are introduced in this article.

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