1. A machine vision method of determining a location of an object, the method comprising the steps of A. placing a calibration target on the object, the target comprising i. two or more regions, each region being defined by at least two linear edges that are directed toward a reference point; ii. at least one of the regions having a different image able characteristic from an adjacent region; B. generating an image of at least the calibration target; C. identifying edges in the image corresponding to lines in the calibration target; D. determining a location where lines fitted to those edges intersect.