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Image reader

  • US 5,995,245 A
  • Filed: 10/22/1997
  • Issued: 11/30/1999
  • Est. Priority Date: 10/25/1996
  • Status: Expired due to Term
First Claim
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1. An image reader for reading a document placed on a document table, said image reader comprising:

  • an image reading device for reading a document and for outputting image data;

    a scanning control means for executing a first pre-scanning, a second pre-scanning and a main scanning;

    a first condition detecting means for detecting a first condition of the document based on image data of the document obtained by the image reading device during the first pre-scanning;

    a first image reading correcting means for correcting a reading of a document based said detected first condition;

    a second condition detecting means, responsive to the first image reading correcting means, for detecting a second condition of the document based on image data of the document obtained by the image reading device during the second pre-scanning, said image data of the document obtained by the image reading device during the second pre-scanning being corrected by said first image reading correcting means based on said detected first condition; and

    a second image reading correcting means for correcting a reading of a document based on said detected second condition;

    wherein image data of the document obtained by the image reading device during the main scanning is corrected by said second image reading correcting means based on said detected second condition, said first condition being different than said second condition.

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