10. An article comprising a machine-readable medium storing instructions adapted to cause one or more machines to perform operations comprising: receiving a plurality of proposed character assignments for at least one instance of a character in an image on which optical character recognition is being performed, each of the character assignments representing a character determined from a character set for the at least one instance of the character by the optical character recognition, the at least one instance of the character residing in one or more character strings of multiple characters, at least one of the character strings of multiple characters known to exclude a subset of at least one character from the character set based at least in part on the at least one character string of multiple characters' location in the image; and eliminating at least one of the proposed character assignments by comparing the at least one of the proposed character assignments to the subset of at least one character excluded from the at least one character string of multiple characters.
10. An article comprising a machine-readable medium storing instructions adapted to cause one or more machines to perform operations comprising: receiving a plurality of proposed character assignments for at least one instance of a character in an image on which optical character recognition is being performed, each of the character assignments representing a character determined from a character set for the at least one instance of the character by the optical character recognition, the at least one instance of the character residing in one or more character strings of multiple characters, at least one of the character strings of multiple characters known to exclude a subset of at least one character from the character set based at least in part on the at least one character string of multiple characters' location in the image; and eliminating at least one of the proposed character assignments by comparing the at least one of the proposed character assignments to the subset of at least one character excluded from the at least one character string of multiple characters. 32. The article of claim 10 wherein the image comprises a specified format comprising a plurality of fields, and further wherein the at least one character string of multiple characters' location in the image used to determine the excluded subset of at least one character from the character set comprises the at least one character string of multiple characters' location in a particular one of the plurality of fields.