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- * @demohfe demonstrates the separation
- * of an image into low frequency,
- * high frequ. edges and hf non-edges
- * by P. W. Verbeek TU-DELFT
- read trui
- lmax A B 7 * maximum
- lmin A C 7 * minimum
- lmin B D 7 * lohull
- add C B * dynamic threshold, low freq
- lmax C C 7 * uphull
- add C D * midian
- cop B C
- sub D C 127 * midian-dyth, hf edges
- sub A D 127 * ori-midian, hf non-edges
- don 2 * display contrast streching
- gdisp D * applied on D
- don * back to normal display
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