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Abstract

A system and method for locating and reading digital data in data regions within a data field disposed on a surface of an object to be identified include the capability of compensating for optical or physical distortions of the data field as viewed by an optical reader. The data field is defined by X-axis and Y-axis intersecting basic lines disposed at a predetermined angle with respect to each other and a corner mark disposed on the opposite side of the data field from those basic lines. A plurality of positions marks for marking predetermined distances between a plurality of imaginary X and Y axis internal lines are also provided. The positions of the imaginary X-axis internal lines within the data field are determinable from their spacings and angles with respect to the Y-axis basic line. The positions of the imaginary Y-axis internal lines are determinable from their spacings and their angles with respect to the X-axis basic line. The location of the points of intersection of the imaginary X and Y axis internal lines are calculated in order to define data regions within the data field. The system and method compensate for optical and physical distortions of the locations of the X and Y axis basic lines, corner mark and position marks at the time of reading the data in order to accurately locate positions of the data regions within the data field.

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First Claim