I am new to the field of Camera Calibration. We have successfully calibrated our camera through classic method (using checkerboard etc). I recently realized there is a field of research for Automatic Camera Calibration. I expect these methods to only be capable of estimation intrinsic camera parameters. However, from my early researches, it seems to me, that they can estimation extrinsic camera parameters (X,Y,Z position in the world coordinates). It occurred to me that:
If these methods does not need any control points (real world points with measured distances)?
If it is so, how they do that, I mean how they know where is the camera in the world?