■
Forward
This function Fourier-transforms the current image, and displays the transformed spot
(diffraction image).
Select Forward from the FFT window.
Fourier transformation starts, and the spot (diffraction image) resulting from
transformation is displayed.
If the spot is dark, you can increase the contrast using Contrast
×
2.
■
Inverse
This function performs reverse Fourier transformation on a Fourier-transformed spot
(diffraction image), and displays a real image.
Display the Fourier-transformed spot (diffraction image) in the Display
Window, and select Inverse in the FFT window.
Reverse Fourier transformation starts, and a real image is displayed.
If you wish to recall a spot (diffraction image) that was previously Fou-
rier-transformed and memorized in the computer, use Display to display the
spot image. If you select Select to display an image, the computer will recog-
nize the image as a spot image, preventing it from being re-
verse-Fourier-transformed.
■
Contrast
×
2
This function accentuates the contrast (brightness) of the spot image that was
Fourier-transformed using Forward.
Display a spot image, and select Contrast
×
2 of the FFT window.
The contrast (brightness) is intensified by a factor of two.
The contrast enhancement is performed only on the displayed image and has
nothing to do with the original data itself.
The Contrast
×
2 operation can be repeated as many times as needed until a
good enough contrast is obtained. The contrast is doubled each time.
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TMPM5200-2
