IDEC DATAVS1 Series - Manual (Page 48)

Instruction Manual SVS1 Series
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To modify the position of the ROI, move to the Move ROI icon and then press SET. It is now
possible to move the ROI using the ARROW buttons. Once you have achieved the desired
position, press the TEACH button to return to the Setup menu. If you wish to modify the ROI
size, select the Resize ROI from the Setup menu (using the SET button again). It is now possible
to increase or decrease the ROI size using the ARROW buttons.
• Parameters:
Expected
This indicates the expected contrast value, that is the threshold on which the inspection result is
assessed.
• Sensitivity
This modifies the sensor contrast sensitivity. In practice, if the sensitivity parameter is increased,
the calculated contrast value will also increase.
• Result
If the contrast value inside the ROI is above the set threshold, the result will be positive (green
colour indicator and ROI edge) if it is below the threshold, the result will be negative (red colour
indicator and ROI edge)
• Example:
We would like to add the contrast test to the current inspection to check the presence of post
office stamps on envelopes.
Let's select "Contrast" from the Controls menu and then press the SET button.
First of all let's adjust the camera settings. The image is in fact overexposed and the stamp is
lacking in contrast.