Abstract: A method for calibrating at least one device (2) that comprises a camera, in which an object (3, 10) having at least one reference element (4, 11, 12, 13, 14) is brought into the image area of the camera. A first position of the reference element (4, 11, 12, 13, 14) relative to the device (2) is determined from an image (5, 6, 8, 9, 15, 16) made by the camera. Then a displacem relative to the device (2) is imposed on the object (3, 10). A second position of the reference element (4, 11, 12, 13, 14) relative to the device (2) is determined from a second image made by the camera (5, 6, 8, 9, 15, 16). A real displacement of the object (3, 10)(3) relative to the device (2) is determined from the first and second relative positions, which real displacement is compared with the imposed displacement.

Abstract: By means of a method, at least one component is placed on at least one substrate. The component is picked-up by at least one placement machine and is placed at a desired position on the substrate. After the component is placed on the substrate, an image of the component placed on the substrate is taken by a camera. Any difference between the actual position of the component on the substrate and a desired position of the component on the substrate is established on account of the image. The positioning of another component to be placed on the substrate takes into account any such difference.