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Fourier Transform is an advanced method of surface analysis and filtering. The command Fourier serves for 2D Fourier Transform presentation of the surface image. The contrast of the Fourier image may be adjusted by Contrast in three different ways: More (contrast increase), Less (contrast decrease) and Restore (the contrast restored to initial value). All this variants may be also selected in the Falling Menu, appeared after the click of the Right Button of the Mouse in the spectrum image.
It is possible to select several arbitrary rectangular regions in the Selection Mode or put Marks in the Marks Mode. To select the mode press the Right Button of the Mouse in the spectrum image. To delete the selected region, put a mouse pointer on it - near the pointer small red cross appear - and click the left mouse button on the region.
If you have selected some regions in the spectrum image it is possible to put to zero either its inner or outer regions. The following Commands are used for it: Zero Inner and Zero Outer. These commands can be called by the Click of the Right Button of the Mouse or from the Fourier Menu. The changes in the surface image corresponding to the new Fourier spectrum will be seen immediately.
The values of periods and intensity (in arbitrary units) for the point where the cursor is placed are seen in the status line of the Main Window. When you put Marks in the Mark Mode, the corresponding period and intensity are appeared near the selected point.
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