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Document image scanning device that provides image of proper appearance while preserving image density

  • US 7,336,399 B2
  • Filed: 09/25/2001
  • Issued: 02/26/2008
  • Est. Priority Date: 09/26/2000
  • Status: Expired due to Fees
First Claim
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1. A device for scanning a document, comprising:

  • a photoelectric conversion unit which scans a document, and supplies image data of the scanned document;

    a background detecting unit which detects a background level of the image data so as to produce original background level value data that is separate from and not part of the image data and indicative of the background level;

    an image processing unit which applies one or more types of image processing to the image data, and applies image processing identical to said one or more types of image processing to the original background level value data to produce image processed modified background level value data; and

    a background removal unit which generates a threshold derived from the image processed modified background level value data, and which utilizes said generated threshold to remove background noise from the image processed data.

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