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Original-discrimination system for discriminating special document, and image forming apparatus, image processing apparatus and duplicator using the original-discrimination system

  • US 6,272,248 B1
  • Filed: 03/02/1998
  • Issued: 08/07/2001
  • Est. Priority Date: 08/03/1992
  • Status: Expired due to Fees
First Claim
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1. An original discrimination system for determining whether or not an original image is identical to a predetermined reference image, in response to data concerning said original image being input, duplication of said reference image being inadmissible, the determination comprising the steps of:

  • a) removing extremely fine lines and isolated dots from the original image, b) determining whether in a predetermined area fine lines have been recognized in a number which exceeds a predetermined limit to be allocated to the original image;

    c) interrupting the copying operation when the number equals or exceeds the predetermined limit, and continuing the copying operation when the number falls below the predetermined limit;

    d) determining whether in the predetermined area fine lines are present with equal or unequal distance; and

    e) interrupting the copy operation if the fine lines are recognized with unequal distance.

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