This is mainly influenced by the filtering process in Fourier plane and the low diffraction efficiency of the encoding grating.

说明傅里叶频谱面的滤波处理及编码光栅的衍射效率对图象输出信噪比的影响。

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The frequency pseudocolor-coded speech spectrogram is then obtained by means of a sampling narrow slit placed at Fourier plane in white-light optical spectrum analyzer.

然后在白光光学频谱分析系统中，利用放置在傅里叶频谱面上的取样狭缝得到按频率假彩色编码的频谱图。

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If all pictures are characterized by similar Fourier spectra, which have different scales, the optical fractal pattern can be obtained in the output plane.

如果所有的图像具有相同的傅里叶光谱特征，而这些光谱却具有着不同的尺度，在输出平面上便可获得分形图像。

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