Position determination

摘要

A method of determining the position of an object based on the identification of a plurality of markers at respective reference positions, wherein correction factors are applied to the stored or measured marker positions to prevent a jump in the determined position of the object as markers pass into and out of use. The correction factors are calculated so that the corrected marker positions tend to mutually self-consistent values and the rate of variation of the correction factors is limited to a pre-determined level. <IMAGE>