Abstract: The position of an object is determined by calculating the coordinates of the center of gravity of the overall image of the object supplied by an image sensor and the coordinates of the centers of gravity of, for example, quadrants converging in the center of gravity of the overall image on the basis of a binary silhouette of the object. These coordinates are compared with desired values in order to change subsequently the orientation of the sensor with respect to the object so that the difference between the coordinates to be calculated and the desired coordinates is minimized. The sensor is moved in orientation and/or position relative to the image sensor in step-wise fashion in order that the image approaches a reference image.