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floating type input to FFT [message #19253]

Tue, 29 February 2000 00:00

Meghan Canning
Messages: 1
Registered: February 2000

Junior Member

Hi there,

I have been using the FFT function, and have just realized that the output
spectra generated is wrong. More specifically, I read in an image, and
depending on whether I pass it straight through the function, or scale
it/convert to float (using FLOAT), the output changes. As far as I can
tell, it's fine when I just pass in image data (integer gray values). When
I convert to floating type first, the magnitude and PSD result in a very
unusual symmetry.

Any ideas?

Meghan

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