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Recognition of numerical characters in digital images

  • US 8,958,643 B2
  • Filed: 06/11/2014
  • Issued: 02/17/2015
  • Est. Priority Date: 08/30/2010
  • Status: Active Grant
First Claim
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1. A system, comprising:

  • a processor configured to;

    extract a subimage from a received image comprising information pertaining to a plurality of numerical characters, wherein the extracted subimage is associated with one of the plurality of numerical characters;

    perform recognition based at least in part on a set of topological information associated with the subimage, including;

    process the subimage to obtain the set of topological information associated with the subimage, wherein the processing of the subimage includes;

    obtain the set of topological information by extracting one or more vertices and one or more edges associated with the subimage; and

    add a central point representing a closed ring to the set of topological information;

    compare the set of topological information associated with the subimage with a preset set of stored topological information, comprising;

    compare an order in which the extracted one or more vertices were detected during a traversal process with an order of vertices of the preset set of stored topological information, the traversal process beginning from a predefined pixel of the subimage and continuing to a next filled in pixel in a predefined order;

    determine that in the event that the set of topological information associated with the subimage matches the preset set of stored topological information, the subimage is associated with a recognized numerical character associated with the preset set of stored topological information; and

    a memory coupled to the processor and configured to provide the processor with instructions.

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