Interpretation of optical flow correspondence

The problem is considered of using two distinct views taken from unknown viewpoints of a number of points of which optical flow was known, to recover the position of the points in space, their motion, and the relative displacement of the viewing systems. The viewing systems were assumed stationary and the object moving. A linear method was proposed where the relative displacement of the viewpoints was first determined. Once this displacement was computed, the position of the points in space, and their motion, were given straightforwardly