A method for locating a printing substrate moving on a conveyor surface. The method includes i) providing the printing substrate moving on a conveyor surface at a selectable speed and in a feed direction, ii) providing an illumination means configured to emit a light beam incident on the conveyor surface according to a predetermined angle, iii) acquiring a predetermined plurality of lines of the substrate, as a function of a line frequency defined as a function of an acquisition rate, iv) generating a primary image as a function of the predetermined plurality of lines, v) detecting, from the primary image, points representative of the substrate, and vi) calculating location coordinates of the substrate relative to the first predefined reference as a function of the plurality of representative points.