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fft: 1-d signal available, though could be used to 2-d signal.
fft2: 2-d signal available. fftshift: modify the spetrum with the low and direct frequency values in the centre of the plan and high ones around, and you can also achieve by shift your signal which is to be transformed. Thx for reading. PS:若还算满意,直接点击“Thanks”,再次登陆时亦便于查看回答是否真的帮到你了。 |
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