Image analysis – Applications – Reading maps – graphs – drawings – or schematics
Patent
1993-11-24
1996-04-30
Boudreau, Leo
Image analysis
Applications
Reading maps, graphs, drawings, or schematics
382203, 382168, 382100, G06K 900
Patent
active
055132715
ABSTRACT:
Input image data define an input image that shows a proportioned parts graph, such as a pie chart or a whole or segmented bar graph. The input image data are used to obtain segmented feature data indicating a feature in the input image that satisfies a constraint on segments. The segmented feature data are used to obtain proportion data indicating each segment's proportion. Various criteria could be applied to find parts of the input image that form the feature. For example, for some pie charts, the segments constraint could include a circularity criterion, a center criterion, and a direction criterion, and proportions could be obtained from directions. For other pie charts, the segments constraint could include a distinct regions criterion and a circularity criterion and proportions could be obtained from directions of region sides. The segments constraint could include a feature candidate criterion for a specific category of proportioned parts graphs, a center criterion applicable to all categories, and either a direction criterion or an angle criterion. The direction criterion could require a part that extends radially from a center, while the angle criterion permits parts that cover a range of angles. For either criterion, the segments constraint could also require nearness to a reference point such as the center. The input image can show a sketch and the proportion data can be used to obtain output image data defining an output image that includes a precisely formed proportioned parts graph or other graphical representation of the indicated proportions.
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Mahoney James V.
Rao Satyajit
Anderson D. R.
Boudreau Leo
Xerox Corporation
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