Rotation-invariant recognition of character strings for Korean cadastral map digitizing

This paper addresses a novel recognition technique for rotated character strings. Rotated character strings appear in character/graph mixed drawings such as cadastral maps, engineering drawings, etc. Recently, there are huge demands for systems of automatic map recognition. One of the most critical obstacles for such systems, however is the recognition of rotated character strings. Rotated characters are represented by the relative chain code and recognized. The possible misinterpretation of a character string has been resolved by deriving vertical/horizontal vector of the character string from a recognized unambiguous character in the character string. The proposed technique discusses primarily numeral string recognition, but it can be readily extended to the strings of other character sets