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FFT and IFFT

Started by eddylamhk October 28, 2003
Hi,
I want to ask if I FFT an image, how can I recover the image using
IFFT. I try to use it directly, but turn out some a totally bright
picture. However, when i change the image to a very simple one, say
only black and whit region, ifft can receover the image. I find out
from textbk that there should a (-1)^n be multiplied in the
transformation. But how should I do.

Anyone can help me, thx a lot.

Eddy