7. A method, comprising: 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 determining whether a closed ring associated with at least a portion of the one or more vertices and at least a portion of the one or more edges exists, wherein the determining whether the closed ring exists comprises: proceeding from a first filled in pixel to a second filled in pixel, the second filled in pixel being adjacent to the first filled in pixel; proceeding from the second filled in pixel to a third filled in pixel repeatedly until the first filled in pixel is reached, the third filled in pixel being adjacent to the second filled in pixel; and in the event that the first filled in pixel is reached: associating a point within the closed ring as representing the closed ring; and adding a location of the point representing the 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; 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.
7. A method, comprising: 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 determining whether a closed ring associated with at least a portion of the one or more vertices and at least a portion of the one or more edges exists, wherein the determining whether the closed ring exists comprises: proceeding from a first filled in pixel to a second filled in pixel, the second filled in pixel being adjacent to the first filled in pixel; proceeding from the second filled in pixel to a third filled in pixel repeatedly until the first filled in pixel is reached, the third filled in pixel being adjacent to the second filled in pixel; and in the event that the first filled in pixel is reached: associating a point within the closed ring as representing the closed ring; and adding a location of the point representing the 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; 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. 12. The method of claim 7 , wherein the recognized numerical character is one of the following: 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9.