Device and method for character recognition and for recognition of mathematical expressions

摘要

A mathematical expression recognizing device comprises a character recognition unit (112) configured to recognize characters in a document image containing a text and a mathematical expression, a first dictionary (201) configured to store a pair of evaluation scores for each type of word that can be identified by means of normal expression, the score showing the possibility of belonging to the text and that of belonging to the mathematical expression, an evaluation unit (113) configured to obtain the evaluation scores showing the possibility of belonging to the text and that of belonging to the mathematical expression for each of the words included in the characters recognized by the character recognition unit with reference to the first dictionary, and a mathematical expression detecting unit (114) configured to search for an optimal path connecting words by selecting one of the text and the mathematical expression based on a formative grammar and the evaluation scores showing the possibility of belonging to the text and that of belonging to the mathematical expression for each of the words, thereby detecting characters belonging to the mathematical expression.