HudsonT

So kind of similar scenario, I am using a insight 2000 camera to scan pads and I need it to detect a very minor difference in two pads. We have it set up to set off an alarm if a pad goes un-punched under the camera. But this pad isn't supposed to get punched, yet gets picked up by the camera/program regardless. What would be the best way to try to differentiate them? I have tried to mess with the exposure and lighting, but nothing seems to work.