Method and apparatus for locating and decoding machine-readable symbols
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United States of America Patent
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Jul 28, 1998
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N/A
app pub date -
Feb 16, 1996
filing date -
Feb 16, 1996
priority date (Note) -
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Abstract
A method and apparatus for locating and decoding machine-readable symbols is provided. The present invention stores an image of the symbol and locates all Jordan curves having an angular length less than .pi. within the image of the symbol. The present invention finds and selects all convex Jordan curves from the set of all Jordan curves found within the stored image. The present invention determines equations of a pair of tangent lines from end points of each convex Jordan curve and determines an equation of a center line for each pair of tangent lines. The present invention determines a point of intersection of the center lines, and based on the point of intersection, locates a center point of a finder pattern of the symbol. The present invention confirms that the located center point is indeed the center of the finder pattern, and thereafter decodes the symbol.
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