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Image detecting method, image detecting system, program, and recording medium for image detection

  • US 6,862,370 B2
  • Filed: 05/16/2001
  • Issued: 03/01/2005
  • Est. Priority Date: 05/19/2000
  • Status: Active Grant
First Claim
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1. An image detecting method comprising the steps of:

  • a) searching for a pattern satisfying a predetermined commencement requirement by scanning an input image;

    b) using the pattern as a starting point, with referring to a dictionary storing therein distances between a center line and an edge of a detection-target semicircle, determining for each of a predetermined number of main scan lines along a sub-scan direction whether or not a predetermined edge pattern occurs within a respective range of a distance in said dictionary, wherein each main scan line not satisfying the range according to the dictionary is counted as an error; and

    c) determining a detection of the semicircle when the number of errors is less than a predetermined threshold.

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