| 摘要 |
PURPOSE:To improve efficiency of processing of character recognition and to make speed of character recognition constant by counting the number of profile black picture elements while judging whether each constituting picture element is black picture element or not and whether the picture element is profile black picture element or not in scanning a character picture. CONSTITUTION:An unknown character 2 indicated on a sheet of paper 1 is read by a pattern reading device 3 consisting of CCD etc. and its optical pattern is converted to a digital signal of time series by an A/D converter 4. A preprocessing circuit 5 performs removing of noise of the digital signal and binary coding by a specified threshold level, and stores a character picture in a picture memory 6. The picture memory 6 is made up of plural vertical and horizontal picture elements, and picture data of binary coded character picture are stored in each picture element. A dictionary collating circuit 8 collates characteristic of character picture obtained by a characteristic extracting circuit 7 with examples of characteristic of reference pattern stored beforehand in a dictionary 9, and outputs the result of collation.
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