Finding a known height in an image
I have an image of a wall taken from a phone camera from a known height h
from the ground.
Assume that the camera was held perfectly parallel to the wall and that
the bottom of the image is perfectly aligned with the bottom of the wall.
Is there a way to find out the point in the image that corresponds to the
height h ? (i.e if I drew an imaginary line (that's parallel to the
ground) from the camera lens to the wall, at what point would the
intersection of the line on the wall show up in the image ?
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