Soglia di contrasto
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.

Set a value between 1 and 200. The default value is 50. If you set a small value, the tool will be able to find the target in obscure images as well but take longer to complete the location process. If the tool is prone to inadequately find blemishes and other unwanted edges with low contrast, try setting a larger value. Those image features whose contrast is lower than the threshold are ignored. Selecting the [Image + Edges] in [Image Display Mode] lets you check the image features extracted based on the current threshold.