Embedded interaction code recognition
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United States of America Patent
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Oct 6, 2009
Grant Date -
Oct 26, 2006
app pub date -
Apr 22, 2005
filing date -
Apr 22, 2005
priority date (Note) -
In Force
status (Latency Note)
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Abstract
In accordance with embodiments of the invention, embedded interaction code (EIC) symbols are recognized. EIC dots are generated based on effective EIC symbols, which have been generated by processing an image containing the EIC symbols, by obtaining graylevels of selected positions of the EIC-symbols. Rotated EIC dots are generated based on the EIC dots by determining which grid cells correspond to the EIC symbols and by determining which direction is a correct orientation of the EIC symbols. A homography matrix is updated with orientation information based on the EIC dots. EIC bits are extracted from the rotated EIC dots based on graylevels of selected positions of the rotated EIC dots.
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