通过复频域分析，从理论上提出了一种建立输送管内不可压缩流体动态传送简化模型的方法。
A method based on complex frequency domain analysis is presented for the simplification of the partial differential model of non compressible fluid transportation process.
方法针对传统数字水印技术的有限性，通过对频域数字水印算法进行分析，提出了一种新的数字水印算法。
Methods Owing to the shortcomings of the traditional digital watermark techniques, analyze the frequency domain watermark algorithm, propose a new digital watermark method.
对于纸页的均匀性分析，通过图像变换，将空间域图像变换到频域或小波域进行分析，获取其特征；
The homogeneity of the sheet is analyzed by image transform, i. e. the spatial domain image is transformed to frequency domain or wavelet domain to obtain the features.
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