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Draw a square on camera screen based on focul length and dpi

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Goal:

I'm trying to draw a square for credit card in the middle of camera screen using react native. As different phones has different focal length and DPI so static square didn't work. I want to draw square based on focal length and DPI so user can fit card inside that square while capturing image.

Problem:

I've following input param but don't know how to draw exact square based on camera properties. Please help me about formula or something.

  • Focal Length

  • Image Quality

  • Image Dimensions

Distance will be 7-8 feet away from camera.

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