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System and method for automatically detecting edges of scanned documents

  • US 6,930,804 B2
  • Filed: 02/01/2001
  • Issued: 08/16/2005
  • Est. Priority Date: 02/01/2001
  • Status: Expired due to Fees
First Claim
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1. A method for automatically detecting an edge of a document in a scanning system, comprising the steps of:

  • (a) scanning a portion of the document to obtain a set of image data;

    (b) calculating a set of first values from the image data using a first function, the first function being a first-order function;

    (c) calculating a set of second values from the image data using a second function, the second function being a second-order function;

    (d) determining a first slope value, the first slope value being a function of the difference between a plurality of the first values;

    (e) determining a second slope value, the second slope value being a function of the difference between a plurality of the second values; and

    (f) determining a detected edge of the document from the first slope value and the second slope value.

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