CImg FFT return values

Question

I'm a bit confused about the return values of CImg's get_FFT() Function.

The fourier transform should give me a real and imaginary part. get_FFT() returns a CImgList with two images - which one is the real and which is the imaginary part? It seems that there's no clue in the documentation.

And also I need to get the amplitude and phase out of it. IIRC the amplitude is calculated like this (realImg.pow(2) + imagImg.pow(2)).sqrt()

How do I get the phase?

score 0 · Accepted Answer · answered Mar 21 '13 at 19:18

0

The phase angle can be calulated using

CImg<float> PhaseAngle = imagImage.get_atan2(realImg)

answered Mar 21 '13 at 19:18

mish

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CImg FFT return values

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