# Point of origin in stereo-calibration OpenCV?

I set up a stereo-vision system to triangulate 3D point given two 2D points from 2 views (corresponding to the same point.) I have some questions on the interpretability of the results.

So the size of my calibration squares are '25mm' a side, and after triangulating and normalizing the homogeneous coordinates (dividing the array of points by the fourth coordinate), I multiply all of them by 25mm and divide by 10 (to get in cm) to get the actual distance from the camera set up.

For eg - the final coordinates that I got were something like ([-13.29, -5.94, 68.41]) So how do I interpret this? 68.41 is the distance in the z direction, and -5.94 is the position in the y and -13.29 is the position in the x. But what is the origin here? By convention is it the left camera? Or is it the center of the epipolar baseline? I am using OpenCV for reference.

• It sounds like my situation and I don't get it. Did you solve? – user36327 Feb 18 at 6:12