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Sheet identifying device

  • US 8,194,236 B2
  • Filed: 07/31/2007
  • Issued: 06/05/2012
  • Est. Priority Date: 09/29/2006
  • Status: Active Grant
First Claim
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1. A sheet identifying device, comprising:

  • a reader for reading a sheet in a plurality of pixels, a respective one of which includes color information having a brightness, a predetermined size of which is defined as one unit;

    a storage section for storing image data made up of the plurality of pixels read by the reader;

    an increasing/decreasing section configured to increase/decrease a number of pixels in the image data;

    a sheet identifying section that identifies an authentication of the sheet, based upon the image data having the number of pixels increased/decreased by the increasing/decreasing section; and

    a variable wavelength light-emitting section which is capable of irradiating a print area of the sheet with light beams having different wavelengths.

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