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Image processing apparatus for embedding information with a noise-multiplexed distribution, and method, computer program, and computer-readable storage medium therefor

  • US 7,269,272 B2
  • Filed: 06/23/2003
  • Issued: 09/11/2007
  • Est. Priority Date: 06/28/2002
  • Status: Expired due to Fees
First Claim
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1. An image processing apparatus which converts multilevel image data into frequency component data for each pixel block of a predetermined size to compression-code the multilevel image data, and multiplexes noise on the multilevel image to embed visible additional information with a noise-multiplexed distribution, comprising:

  • input means for inputting, as the additional information, information representing whether or not to multiplex noise for each pixel block or the predetermined size;

    determination means for determining on the basis of the input additional information whether a pixel block of interest is located at a position where noise is to be multiplexed;

    specifying means for, when said determination means determines that the pixel block of interest is located at the position where noise is to be multiplexed, specifying a bit region where noise is to be multiplexed in data constituting a converted low frequency component of the pixel block of interest on the basis of a reference region serving as a converted low frequency component of a neighboring pixel block near the pixel block of interest; and

    change means for reversibly changing bit information for the bit region in the data of the low frequency component specified by said specifying means.

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