Patent ID: 6548768
Filing Date: 2003-04-15
Classification: G06F,G06K

Abstract:
A method for determining a virtual raster of a code pattern consisting of a plurality of marks with associated coordinates mn, each mark being located at a nominal position but displaced from the nominal position in one of a plurality of directions, depending upon the value of the mark, in addition to which the nominal positions define raster points gn of the virtual raster, and the raster points are situated on raster lines which intersect at a first angle,comprising: determining an initial vector V1,2 on the basis of the coordinates m1, m2 of one or more marks, which initial vector extends approximately between a first and a second adjacent raster point g1, g2; determining a second vector V2,3 which forms said angle with the first vector and is the same length as the first vector and extends from the second raster point g2 approximately to a third raster point g3; determining a mark coordinate m3 which belongs to the third raster point g3; determining the actual coordinates for the third raster point on the basis of the third mark's coordinates and its value and the preceding raster point's coordinate; and storing the third raster point's actual coordinates.