Method for coupling co-ordinate systems, and computer-assisted system

A method for coupling a relative coordinate system of a relative automatic position finding system, which is based on scanning of surroundings, to an absolute coordinate system of an absolute localization system, which is based on signal interchange with at least temporarily stationary components of the absolute localization system, the method comprising:

• capturing optically identifiable identifiers of the localization system using a light sensor attached to a mobile apparatus of the relative automatic position finding system,
• ascertaining a relative position for each of the captured optically identifiable identifiers in the relative coordinate system of the relative automatic position finding system,
• retrieving absolute positions of the optically identifiable identifiers in the absolute coordinate system, the optically identifiable identifiers being attached to the at least temporarily stationary components of the absolute localization system,
• determining an absolute position of the light sensor in the absolute coordinate system by comparing the relative positions of the optically identifiable identifiers in the relative coordinate system with the absolute positions of the optically identifiable identifiers in the absolute coordinate system, wherein the comparing comprises size scaling of the relative coordinate system in one or more axes and alignment of the relative coordinate system with respect to the absolute coordinate system, and
• coupling, based on the absolute position of the light sensor, the relative coordinate system to the absolute coordinate system by recording a relationship between the relative coordinate system and the absolute coordinate system based on the size scaling and the alignment,
• determining a relative position of the mobile apparatus in the relative coordinate system, by the relative automatic position finding system, as part of a computer-aided system, and
• compensating a drift of the determination of the relative position of the mobile apparatus using the coupling of the relative coordinate system to the absolute coordinate system.