If a special calibration was used while taking pictures, these calibration parameters can be entered in the Calibration frame :
The calibration gives the size of one pixel in a measured unit. Enter the value in the first text box.
You can choose the unit you want in the second text box. i.e. : mm, inch...
You can also enter some extra values (i.e. : load, global displacement) for a further plot drawing. Enter the extra value name in the combo box and its value in the Extra values text box :
