Method of imaging a coding pattern and calculating a perspective transform using optimal numbers of target elements
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United States of America Patent
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Jun 19, 2012
Grant Date -
Aug 14, 2008
app pub date -
Feb 5, 2008
filing date -
Feb 8, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of imaging a coding pattern disposed on a surface of a substrate. The method comprises the steps of: (a) positioning a nib of an optical reader on the surface and capturing an image of a portion of the coding pattern; (b) locating at least nine target elements in the imaged portion; (c) observing a perspective distortion of the target elements due to a 3D orientation of the reader relative to said surface; (d) calculating a 2D perspective transform using the target elements; and (e) determining a position of the nib on the surface using the 2D perspective transform and local tag data contained in the imaged portion. The imaged portion of the coding pattern has a diameter of at least one tag diameter and less than two tag diameters. The coding pattern is specially adapted for the method.
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