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Method for determining the amount of skew of image, method for correcting the same, and image data processing system

  • US 5,181,260 A
  • Filed: 10/31/1990
  • Issued: 01/19/1993
  • Est. Priority Date: 10/31/1989
  • Status: Expired due to Term
First Claim
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1. A method for correcting the skew of a document image with respect to a reference angle by detecting the angle of skew of an image by integrating the document image or a characteristic amount of the document image in a plurality of radial directions and by discriminating as to the direction in which the resultant value of integration thereof is peak, the method comprising the steps of:

  • (a) performing first an integrating and discriminating operations for a narrow range of angles including the reference angle;

    (b) performing next the integrating and discriminating operations for a range of angles wider than that of said narrow range only when no angle of skew of the document is obtained by the integrating and discriminating operations for the narrow range;

    (c) performing correction of the skew of the image in accordance with the angle of skew obtained in either step (a) or step (b); and

    (d) omitting correction of the skew of the image when the angle of skew is not obtained with respect to the integrating and discriminating operations in steps (a) or (b).

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