The character reader, the method of letter reading and the letter candidacy territory extraction expedient which extracts the letter candidacy

摘要

In sub-string extracting unit 4, a stable feature amount is obtained for the affine transformation, and projective transformation from any two of the rectangle obtained by labeling, by comparing the dictionary feature value, substring There are extracted. The character string candidate extracting unit 5, the evaluation of whether or not it is the pitch which is determined substring is continuous and linearly also performed on the basis of a stable characteristic amount projective transformation, it was taken from an oblique string for license plate, corresponding to the sequence number is extracted. In the peripheral information extraction unit 6, a stable feature amount is obtained for the affine transformation, and projective transformation by using information related to the character string of the sequence number, by comparison with dictionary feature value, number taken from an oblique against the plate, strings are extracted quickly and accurately.