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Number detect in video

Howdy, I am looking into a way to record the time a bicycle enters a rest stop for a charity event. I am thinking that a Raspberry Pi with a camera and OpenCV should be able to do it. But I am not a programmer.

Evch rider has a white bib with a four digit number. I know that not every bib will be detected, due to the mass amount of groups that ride in a pack. But if I can capture as many as I can would help.

I see that there is a tutoral in the book everyone talks about for licence plates, but it looks to be using images not video.

Does anyone have an ideas on the best way to do this? I just need it to record all (or most) of the numbers seen that past by to a text field.

Thanks, Phil