Is it possible to determine the distance to the object from the picture?

Question

Neural networks

Given a picture, is it possible to determine the distance from the camera to any object?
And the second question, if you calculate the distance between people in arbitrary units, is it possible to convert it into real units of measurement (meters, for example)?

Answer 1

Can. We need to find anchors. For example, we find people, a car and windows of a house in the background. Further, knowing the average angular dimensions of a person's height, the height of a car and a window, for example, from a distance of 1 meter. Or 10 meters. Further, it will be easy to determine the distance between them and between the hypothetical point where the picture was taken, if you do not take into account the angle of the lens, but estimate that we are looking with our own eyes.
Your network needs to be trained to recognize an object and determine the deviation of the average angular size from the size in the photo. All this is very difficult, and, as already said, an open question.

Answer 2

No, without knowing the camera lens data

Answer 3

Measuring the distance to an object and its speed

Answer 4

Restoring 3D data from a 2D image/video is an open question right now. For example, here https://www.youtube.com/watch?v=x7xNBs_aIgQ or here https://www.youtube.com/watch?v=keIirXrRb1k
Someone concentrates on certain types of objects - for example, palm position estimation https: //www.youtube.com/watch?v=aE7kW4b6CjA (again, 3D coordinates from 2D video)

Answer 5

You cannot determine 3 coordinates from 1 picture, even if you know the camera parameters.