Detect rectangle shape OpenCv

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I need to detect a rectangle shape (card) in real time, using some javascript library like (js Feat or Tracking Js).

I trained a Haar classifier, but I'm not getting the precision i need. So, I am thinking about using a rectangle detector instead of a cascade xml.

Somebody could give me a hand with this?

Thanks very much and sorry for my english (I am from Argentina).

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