1. A position detecting system, for detecting a position of an object, the system comprising: a plurality of pattern groups arranged directly or indirectly on said object, each of the plurality of pattern groups comprising: at least one node part comprised of at least one shape, and at least one information part comprised of at least one shape; at least one image acquisition device for detecting said plurality of pattern groups; and a computational device comprising means for analysing signals for determining geometrical centres in at least two directions of each of said node parts and determining a type of part for each detected node part and information part; said node parts being arranged to provide a position relative to said image acquisition device and said information parts providing a location of said node parts relative said object.