US 2008/0175484 A1 · METHOD FOR EMPHASIZING DIFFERENCES IN GRAPHICAL APPEARANCE BETWEEN AN ORIGINAL DOCUMENT AND A MODIFIED DOCUMENT WITH ANNOTATIONS

Abstract

A method for emphasizing differences in graphical appearances between an original document and a modified document is provided in accordance with an aspect of the present invention. The method includes the step of receiving a first bitmap of the modified document, and a second bitmap of the original document. The method includes deriving a set of difference points based upon a comparison of the first bitmap and the second bitmap. The method includes a step of superposing a spatial index onto the set of difference points, and generating polygon vertices from a plurality of adjacent elements of index. Each of the elements has a predetermined density of difference points. The method concludes with generating an annotation from the polygon vertices.

Claims27

Dependent claims

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.

3 more elements

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;
deriving from the set of difference points an outer boundary defined by a first subset of polygon vertices;
deriving from the set of difference points one or more inner boundaries defined by one or more groups of a second subset of the polygon vertices;
and
generating an annotation defined by an area between the outer boundary and the one or more inner boundaries.

3 more elements

Dependencies are inferred from the claim text.

Method for emphasizing differences in graphical appearance between an original document and a modified document with annotations

Life of this patent

Method for emphasizing differences in graphical appearance between an original document and a modified document with annotations

Life of this patent

Abstract

Claims27