How to detect oversized stone on the belt conveyor in realtime?

How to detect the oversized stone in running belt conveyor.we have to pass only a pee defined sized stone over conveyor. But sometime due to some reason oversized stone passed over belt.so I want to detect the oversized stone and keep log of it.
Please guide how to proceed…

welcome.

a shutterstock picture won’t do. present what you have.

Image Removed from my post
Please guide me…how I will proceed

perhaps you’d be better served by a comprehensive course on “automated optical inspection” as it is used in industrial settings (applies to all industrial machine vision, not just PCBs. wikipedia is taking this too narrowly)

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From above image I have to find the bigger stone

3 month later, yet still no own attempt at it ?

you can use deep learning. take an existing network, retrain it on a dozen examples from your own data.

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