13. A computer program product, the computer program product being embodied in a tangible non-transitory computer readable storage medium and comprising computer instructions for: extracting 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; and performing recognition based at least in part on a set of topological information associated with the subimage, including: processing the subimage to obtain the set of topological information associated with the subimage, wherein the processing of the subimage includes: obtaining the set of topological information by extracting one or more vertices and one or more edges associated with the subimage; and adding a central point representing a closed ring to the set of topological information; comparing the set of topological information associated with the subimage with a preset set of stored topological information, comprising: comparing 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; and determining 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.
13. A computer program product, the computer program product being embodied in a tangible non-transitory computer readable storage medium and comprising computer instructions for: extracting 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; and performing recognition based at least in part on a set of topological information associated with the subimage, including: processing the subimage to obtain the set of topological information associated with the subimage, wherein the processing of the subimage includes: obtaining the set of topological information by extracting one or more vertices and one or more edges associated with the subimage; and adding a central point representing a closed ring to the set of topological information; comparing the set of topological information associated with the subimage with a preset set of stored topological information, comprising: comparing 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; and determining 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. 16. The computer program product of claim 13 , wherein the preset set of stored topological information is stored in a database.