Fft (Fast Fourier Transformation) - JEOL JSPM-5200 Instructions Manual

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.
TMPM5200-2
Perform the Fourier
transformation
No
Is the spot bright
enough ?
Inverse FFT with
masking spots ?
Load a saved mask
pattern ?
Save mask
pattern ?
６ ANALYSIS OPERATION
Enhancement of
the spot contrast
Mask modify ?
6-49