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Shape detection apparatus

  • US 5,995,663 A
  • Filed: 12/05/1997
  • Issued: 11/30/1999
  • Est. Priority Date: 01/18/1994
  • Status: Expired due to Fees
First Claim
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1. A shape detection apparatus for detecting the shape of an object (Ob) comprising:

  • a digital image signal producing means (1) for producing a digital image signal (Sv) indicative of an object image (Sc1) of the object (Ob);

    an approximate position detecting means (33 and

         11) for producing a designated scanning window (Sc2) configured in a shape having an outline conforming to the outline of object (Ob);

    an edge point detecting means (12) for defining a plurality of sampling line windows (4 and

         14) having a predetermined length (L), each sampling line window being provided to intersect the outline of the designated scanning window (Sc2) at a center point (15a-15h) of the sampling line window for detecting the image density and determining edge points (17, 18, 19,

         25) of the object (Ob); and

    an object detection means (11,

         13) for detecting the shape of the object (Ob) by scanning the digital image signal (Sv) to compare the object image (Sc1) with the designated scanning window (Sc2) and to produce a first position signal (Sc3), indicative of the position of the object (Ob) and a second position signal (Sc4) indicative of said determined edge points (17, 18, 19,

         25), when a predetermined number of the center points (15a-15h) coincide with the edge points (17, 18, 19,

         25).

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