Patent ID: 8028220
Filing Date: 2011-09-27
Classification: G06F,H03M

Abstract:
1. A method of determining a first coordinate value of a position on a printed document with respect to a plurality of first patterns printed on the document, each first pattern respectively representing a first sequence h 1 , with each of the first sequences having a repeating first codeword of a first cyclic position code with length n 1 and minimum distance d min , said method comprising the steps of: sensing the document, via a sensing device, to sense h obtaining from each sensed first pattern a respective first sub-sequence of length w mapping each of the first sub-sequences to a respective mapped codeword of the first cyclic position code; determining a first offset indicative of the position, in the corresponding first sequence, between each mapped codeword and the first codeword; deriving, for each of h deriving the first coordinate value by interpreting at least one of the first differences as a digit of the first coordinate value, and by interpreting at least one of the first differences as a marker separating the first coordinate value from an adjacent coordinate value.