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Method for determining orientation of contour line segment in local area and for determining straight line and corner

  • US 5,870,494 A
  • Filed: 07/16/1997
  • Issued: 02/09/1999
  • Est. Priority Date: 10/02/1991
  • Status: Expired due to Fees
First Claim
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1. An apparatus for determining an orientation of a local line segment in a contour in a local area of a binary contour image, comprising:

  • contour image information holding means for holding information indicating at least coordinates of contour points of the binary contour image;

    pixel number counting means for obtaining the number of pixels of the contour points existing in each of a plurality of orientations around a pixel on the contour point in the local area; and

    local line segment orientation determining means for obtaining an orientation, in which the number of pixels of the contour point located in the orientation is greater than a predetermined number, as an orientation in which a local line segment exists.

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