Patent ID: 8365038
Filing Date: 2013-01-29
Classification: G06F,H03M

Abstract:
1. A method of determining a first coordinate value with respect to a plurality of first patterns printed on a document, each first pattern respectively representing a first sequence, with each of the first sequences consisting of a repeating first codeword of a first cyclic position code, said method comprising the steps of: sensing by a sensing device the first patterns; obtaining from each sensed first pattern a respective first sub-sequence of symbols; mapping each of the first sub-sequences to a respective first mapped codeword of the first cyclic position code; determining a first offset between each first mapped codeword and the first codeword; deriving a difference between pairs of first offsets, and thereby deriving a respective one of a plurality of first differences; and deriving the first coordinate value by interpreting one of the first differences as a marker separating the first coordinate value from an adjacent first coordinate value, and remaining first differences as digits of the first coordinate value.