Time frequency analysis method is used to analyze the time domain and frequency domain of seismic waves at the same time according to the principle of wavelet transformation.

时频分析方法是利用小波变换原理，从地震波的时间域和频率域同时对其作出分析。

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Because the wavelet has time-frequency local property, the wavelet method can analyze the local regularity of function more effectively than frequency domain.

由于小波具有时频局部性，因此与频域方法相比，小波方法更能有效地分析函数的局部正则性。

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After the research on the image fusion method based on the frequency domain, this paper proposed an improved multi-focus image fusion method based on morphological wavelet.

本文在对基于频率域的图像融合方法研究的基础上，提出了一种改进的基于形态学小波的多聚焦图像融合方法。

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