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Image processing apparatus and method and storage medium

  • US 6,822,761 B2
  • Filed: 05/01/2002
  • Issued: 11/23/2004
  • Est. Priority Date: 07/15/1997
  • Status: Expired due to Term
First Claim
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1. An image processing apparatus comprising:

  • an input unit, said input unit inputting an image to which first additional information is added by a first addition method so that it is difficult to discriminate by human eyes and to which second additional information is added by a second addition method so that it is difficult to discriminate by human eyes; and

    an extraction unit, said extraction unit extracting from the image the first additional information according to a first extraction method corresponding to the first addition method and extracting from the image the second additional information according to a second extraction method corresponding to the second addition method, wherein the second extraction method is specified by the first additional information.

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