How can I caluclate the distance to an object from a single image ?

How could I calculate the distance from my fixed tilted camera to an object in the room from a single image ? I want to assume that I have no information about the object size in real world.
What is the minimum information required to caluclate this ?

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Asked:

on 3 Apr 2018

Closed:

on 20 Aug 2021

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