Important! To add the last line connecting the first and last control point, it is important
to select both of the control points required to encapsulate the calibration area (Figure
9-1). To select multiple points, either press and hold Ctrl while using the mouse point
to select points or drag and drop a selection rectangle over the points. Finally click
(Add) again to add the last line.Important! To add the last line connecting the first and last control point, it is important
to select both of the control points required to encapsulate the calibration area (Figure
9-1). To select multiple points, either press and hold Ctrl while using the mouse point
to select points or drag and drop a selection rectangle over the points. Finally click
(Add) again to add the last line.