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`ABSTRACT
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`A character string extraction device according to the present invention includes a
`replacement information registering unit in which replacement information to replace character
`information expected to be erroneously recognized is registered, a candidate character data
`registering unit in which supposed candidate character data is registered, an image information
`converting unit for converting the read image information into character information, a
`character information replacing unit for replacing a specific character with a designated
`character when the character information includes the specific character and generating read
`character data by using the converted character information when the character information
`does not include the specific character, a search character generating unit for replacing a
`predetermined character of the read character data with a special character and, generating
`search character data from the read character data, and a first comparing unit for comparing
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`the search character data with the candidate character data.
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