6.7.5 FFT (Fast Fourier Transformation)
The two-dimensional FFT is applied to a real image to obtain a spot image (a diffraction
pattern of the real image). Also, the inverse transformation is applied to a spot image to
obtain the real image. This function is useful to abstract and display a periodic structure
of the obtained image.
Click on Analyse in the main menu and select FFT in the pull-down menu. The FFT
window will be displayed. The procedure for the FFT function processing is shown
below.
Enhancement of
the spot contrast
Perform the Fourier
transformation
Is the spot bright
enough ?
Inverse FFT with
masking spots ?
Load a saved mask
pattern ?
Save mask
pattern ?
Mask modify ?
No
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