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Do you have any other external information aside from just the cameras? Otherwise, you will only ever be able to determine T up to scale. For example, stereo camera setups use the distance between cameras as their baseline, and comparing T to that distance is trivial and an easy way translate that to the rest of the scene. In your case, you'll need a common object of known size/distance from the cameras, and then do the math to calculate the scale of T.