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FFT function [message #12724]

Thu, 27 August 1998 00:00

Jonas
Messages: 23
Registered: May 1998

Junior Member

Hi!

I use the FFT function in IDL to reconstruct MR Images. My collegue instead
uses an FFT module in Delphi when performing the same task.
His resulting images (when rounded to integer) have modulus pixel values
well inside the limits for a 16 bit integer, i.e. +-32000 something. The IDL
FFT, on the other hand, produces images that look the same but with pixel
values of several millions.

The problem is that I want to save the modulus image information to a 16 bit
integer file, and using IDL forces me to scale each image. This is not
desirable.

Anyone knows of differences in different fft algorithms? How should I
perform the scaling? I need a standard scaling value that allways can be
used, not depending of the maximum pixel values in each image.

Jonas

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