常用的离散傅里叶变换(DFT)、离散哈特莱变换(DHT)均可视为DYT的特例。

The discrete Fourier transform (DFT) and discrete Hartley transform (DHT) can be considered as special cases of DYT.

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首先，概括介绍了哈特莱变换以及基于这种变换的图像编码方法，引入了哈特莱变换的分数形式。

Research methods and basic theories used in this thesis, such as Fourier transform and fractional Fourier transform, are also emphasized in detail.

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