| 摘要 |
PROBLEM TO BE SOLVED: To provide a character reader of a high recognition rate. SOLUTION: Character information entered or the like on a paper sheet medium 9 is optically read in an image scanner part 8 and the image data Din are stored in a data buffer 2 as two-dimensional image data Dxy. A character area detection part 3 divides them into the image data Dc of respective character units and outputs them. The data conversion parts (a1)-(an) of plural systems (n) affine-transform the image data Dc and generate rotary image data P1-Pn rotated to respectively prescribed rotation angles. The feature extraction parts b1-bn of the plural systems (n) similarly extract feature extraction dataα1-αn from the rotary image data P1-Pn and a judgment part 4 obtains a parameter (estimated value)ωclosest to a character corresponding to the image data Dc by executing a signal processing by a maximum likelihood estimation method to the feature extraction dataα1-αn. Then, a collation part 5 reads character code data corresponding to the estimated valueωfrom a character code storage part 7 and outputs them.
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