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METHOD FOR EMPHASIZING DIFFERENCES IN GRAPHICAL APPEARANCE BETWEEN AN ORIGINAL DOCUMENT AND A MODIFIED DOCUMENT WITH ANNOTATIONS

  • US 20080175484A1
  • Filed: 01/24/2007
  • Published: 07/24/2008
  • Est. Priority Date: 01/24/2007
  • Status: Active Grant
First Claim
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1. A method for emphasizing differences in graphical appearances between an original document and a modified document with attached annotations, the method comprising:

  • receiving a first bitmap of the modified document and a second bitmap of the original document;

    deriving a set of difference points based upon a comparison of the first bitmap and the second bitmap, the difference points being representative of coordinates within the first and second bitmaps having pixel value differences exceeding a predetermined threshold;

    superposing a spatial index on to the set of difference points, the spatial index being defined by contiguously spaced cells bound by cell vertices;

    generating polygon vertices from the cell vertices of a plurality of adjacent cells each having a predetermined density of a subset of the difference points associated therewith; and

    generating from the polygon vertices an annotation defined by annotation vertices.

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