1. A method of recognizing an object in an image with at least two independent image processing systems, the method comprising steps of: defining a single model of the object with respect to a world coordinate system of a world space; and for each one of the at least two image processing systems; calibrating a respective image processing system to the world space comprising the world coordinate system by determining a respective transformation between coordinates in an image coordinate system and coordinates in the world coordinate system; acquiring an image; mapping the image into the world coordinate system of the world space using the respective transformation; and matching in the world coordinate system of the world space at least one occurrence of the object in the mapped image with the single model of the object based on a geometric shape of the single model.