areaDetector fft of subsection of image

[Jörn Dreyer via Tech-talk <tech-talk@aps.anl.gov>]

Hello,

I have an areaDetector image which contains its relevant information in the center section of the image.
So to improve performance I would like to calculate the FFT of the image only for a subsection (configurable) of the NDArray.
Has anybody done something like that before?

I know, that FFT performs best if you have an array of size N * N, while most images are N * M with N != M.
So the best would be to create a sub array of lets say 100 * 100 pixels from the center of the image before doing the FFT.

Regards

Jörn