How can I calculate the actual distance in real world of an object from its picture that picked up by a camera?

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i want to calculate or know the distance in the real world between an object and the camera during taking a photo for this object ....what the function or code that can i use to calculate this distance from its picture that picked up by the camera?

Answers (2)

Image Analyst
Image Analyst on 11 Mar 2016
If you have the Computer Vision System Toolbox, see this link on camera calibration:

Dima Lisin
Dima Lisin on 14 Mar 2016
With one camera, you may be able to compute the distance if you have a calibrated camera, and you know the actual size of the object. If you do not know the size of the object, then you would need a calibrated stereo camera, or an RGB-D camera.

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