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Apparatus and method for detecting enlarging ratio or reducing ratio of image data

  • US 6,370,281 B1
  • Filed: 12/01/1998
  • Issued: 04/09/2002
  • Est. Priority Date: 12/01/1997
  • Status: Expired due to Term
First Claim
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1. An enlarging ratio detecting apparatus for detecting an enlarging ratio of digital image data in which said enlarging ratio of an image is unknown, comprising:

  • section means for sectioning said digital image data into horizontal or perpendicular block sizes;

    conversion means for frequency-converting said sectioned blocks;

    addition means for adding respective frequencies of said sectioned blocks;

    retrieval means for retrieving frequencies at which energy is collected based on operation of said addition means;

    calculation means for calculating an enlarging ratio from said retrieved frequencies; and

    restoration means for restoring an image from said image data with said enlarging ratio.

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