IDEC DATAVS2 Series - Manual (Page 50)

SVS2 Series Instruction Manual
45
Example
Add "Contrast" control with rectangular ROI to current inspection.
Select "Contrast" from the pull-down menu:
Position the control on the reference image in the work
area: the pointer changes shape as soon as it enters the
work area. Left-click once at any position to create a
default rectangular ROI. At the same time, the control
features and the result of its application to the reference
image appear in the control panel.
Select "Circular" from the Shape menu: the ROI will
immediately change to a circle. Its position and size may
now be set as explained above.
The result indicated by STATUS is also highlighted by the
ROI border changing colour.
As soon as values change, result is calculated without
delay.
The control thus added to current inspection is also
displayed in the Inspection Explorer: its name is listed
under "Tools" (name specified in the Name field). If you
expand that menu level (click symbol
next to the name),
you will see the parameters set previously.
Hereafter is presented a possible usage scenario for the Contrast Control Tool. In this particular
inspection it’s needed to check the presence of a postal printing on the envelope. If the postal printing
is correctly placed, the overall contrast of the ROI increases its value, if the printing is not present the
contrast value should be very low (the contrast of a uniform area is null). The Fig. A shows a
successful check, the Fig. B on the contrary shows a failure.
Fig. A: SUCCESS Fig. B: FAILURE