OPTICAL INFORMATION READING DEVICE, OPTICAL INFORMATION READING METHOD, COMPUTER-READABLE PROGRAM, AND RECORDING MEDIUM

摘要

An objective of the present invention is to facilitate avoiding errors in reading bar codes, and to allow accurate outputting of bar code data even when an element is damaged or faintly applied. An optical information reading device comprises: a computation unit (23a) which adds the widths of six elements which include bars and spaces which are adjacent within one character, deriving each of 2-n element adding patterns, and converts each of the 2-n element adding patterns to a number of modules of the one character, deriving a number of modules of the 2-n element adding patterns; an extraction unit (23b) which narrows to subject characters wherein each number of modules of the 2-n element adding patterns is an integer with an error less than or equal to 1, and extracts a candidate character; and a search unit (23d) which compares the extracted candidate character of each of the 2-n element adding pattern number of modules with an expected value character for evaluating the candidate character, and searches for the expected value character with the strongest correlation to the candidate character.