DISCRIMINATING METHOD FOR CAPITAL LETTER, SMALL LETTER AND CHARACTER WITH SHAPE SIMILAR TO KANJI (CHINESE CHARACTER) AND KANA (JAPANESE SYLLABARY)

摘要

PURPOSE:To decrease erroneous discrimination by discriminating a capital letter and a small letter by using not only a size of the character but also the center coordinate of the character, when a standard size of the character is almost the same by a kind of the character. CONSTITUTION:Whether a character as a result of recognition is a character having both a capital letter and a small letter or not is decided, and when it is a character having both of them, an external form feature quantity containing its character width, character height and that which is obtained by multiplying them is compared with a threshold for setting the character as a capital letter against its standard character, and a threshold for setting it as a small letter, respectively and decided (determined definitely) as one of a capital letter and a small letter. As for that which is not any of them, that is, a character which cannot be decided by the external form feature quantity, a center line L of the line is derived from the center coordinate of a result of recognition of one line, and by comparing a difference of the center X of the character and the coordinate of the center line L with the threshold determined in advance, a capital letter or a small letter is discriminated. In such a way, an erroneous discrimination can be decreased.