Patent ID: 6570104
Filing Date: 2003-05-27
Classification: G06F

Abstract:
A product for position determination, which product has a surface and a position-coding pattern applied to the surface and codes a plurality of positions on the surface, each position being coded by a specific part of the position-coding pattern and each such specific part of the position-coding pattern also contributing to the coding of adjoining positions, said position-coding pattern being based on a first string of symbols including a first predetermined number of symbols and which has the characteristic that if a group of symbols comprising a specific number of symbols less than said first number is taken from the first string of symbols, the location of said group of symbols in the first string of symbols is unambiguously defined, wherein said position-coding pattern comprises a first row of symbols comprising said first string of symbols repeated several times, and at least a second row of symbols comprising a second string of symbols repeated several times and having said characteristic of said first string of symbols, said second string of symbols including a second predetermined number of symbols which is different from said first number of symbols of said first string of symbols in order to obtain a displacement between the first and the second string of symbols along the first and the second row when the first and the second string of symbols are repeated.