Specificare la soglia di contrasto (differenza tra luce e buio) necessaria nell'immagine per identificare un bordo. Immettere il valore o modificare il valore utilizzando i pulsanti.
The default value is 10, and the specifiable range is from 1 to 200.
If the average contrast of the contour of the found region is below this threshold, then the region will not be considered as a flaw. Faint flaws can be detected when a lower threshold value is specified, but some flaws may be recognized larger and the contour fuzzier. On the other hand, faint 'flaws' are not found when a higher threshold value is specified, and only apparent flaws are found. If the contour of a flaw is fuzzier than you expected it would be, increase this value.