Time-efficient method of analyzing imaged input data to locate two-dimensional machine-readable symbols or other linear images therein
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United States of America Patent
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May 16, 2000
Grant Date -
N/A
app pub date -
Jul 26, 1996
filing date -
Jul 26, 1996
priority date (Note) -
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Abstract
A method and apparatus locates edges of patterns in a stored image, such as edges of start/stop patterns of machine-readable symbols (e.g., PDF 417 symbols). The present invention first divides the stored image into analysis regions and samples each region using a 16-beam star pattern. The beam patterns are analyzed to detect for edges that may correspond to edges of start/stop patterns of the symbol. Coast lines, or elongated edges, of the detected edges are analyzed for parallelism and minimal length to filter out any spurious detected edges. Thereafter, the coast lines are analyzed to confirm that a start or stop pattern has been located. A second start/stop pattern is thereafter located, boundary points are determined at a periphery of the symbol, and finally the symbol is analyzed for its geometric shape to confirm that the located boundary points conform to an accepted geometry for this symbol.
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