Character recognition method of drawing the reader

摘要

PURPOSE:To improve the recognition rate of an inclined character string having character skew by finding out the existence of oblique deformation from the size relation of respective totals of character string thinning vectors before and after normalization, removing skew due to the oblique deformation and recognizing each normalized character. CONSTITUTION:A hand-written character string in a read drawing is extracted and the sum of thinned vector lengths of each character is calculated. The coordinate transformation of the thinned vector of each character is executed by a prescribed normalizing transformation method for removing oblique deformation skew, the sum of thinned vector lengths of each character which consist of coordinate transformed vectors is calculated, the total vector length before normalization is compared with that after normalization, and when the total vector length is shortened by the normalization, the existence of oblique deformation is decided and skew due to the oblique deformation is removed to normalize each character. Then, respective characters in the normalized character string are recognized. Consequently, an inclined character string having character skew can be surely recognized.