How to count objects crossing a line(tripwire)
3 years
Hi Steven,

I have white buttons moving on a conveyor. Im using a webcam to get the video stream, I processed the image, set blob size, and used blob count to get the count of the buttons. But once the buttons move out of the frame the count goes down. What i want is, draw a line like a trip wire, when a button crosses the line, the count should increase. If 10 buttons crosses the line, the count should show 10 even after they are out of frame.
Steven Gentner from United States  [1442 posts] 3 years
Have a look at


which is built for what you are asking for. Note, for a single conveyor you just have 1 line ... but that should work just as well.


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