Recognition method for letter patterns
First Claim
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1. A letter pattern recognition method comprising the steps of:
- preprocessing character patterns;
extracting characteristic data for the character patterns according to elements including a loop, a straight line and an arc which have branches and nodes;
obtaining a center of gravity for each of the respective elements;
normalizing the character patterns by using the extracted characteristic data;
comparing the normalized character patterns with pre-registered classification codes by allotting relative positions of the loop, straight line and arc elements in accordance with information on the center of gravity thereof and determining if a return check is required depending upon the result of the comparison, and performing a return check and returning to the extracting step if a return check is required;
performing balance and stroke checking for the normalized patterns in the absence of the requirement for the return check, wherein the balance checking is performed by using a relationship of weight on the relative position and wherein the stroke checking is performed by checking a direction of the straight line elements, a rotational direction of the arc elements and a link structure of the elements; and
detail-classifying the normalized patterns in such a manner that an orientation of the arc elements, and a length ratio of the elements so as to thereby recognize the character patterns.
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Abstract
A letter pattern recognition method preprocesses each character pattern to effect characteristic extraction based on elements such as a loop, a straight line and an arc and is adapted to compare the character pattern with a preregistered classification code after the normalization thereof, the character pattern being subjected to balance and stroke checks if necessary as a result of the comparison. Notwithstanding this, if the character is not defined, the character pattern is identified by means of detail classifications such as those of a divergent mode of the arc, and a length ratio of the elements and the like.
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Citations
15 Claims
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1. A letter pattern recognition method comprising the steps of:
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preprocessing character patterns; extracting characteristic data for the character patterns according to elements including a loop, a straight line and an arc which have branches and nodes; obtaining a center of gravity for each of the respective elements; normalizing the character patterns by using the extracted characteristic data; comparing the normalized character patterns with pre-registered classification codes by allotting relative positions of the loop, straight line and arc elements in accordance with information on the center of gravity thereof and determining if a return check is required depending upon the result of the comparison, and performing a return check and returning to the extracting step if a return check is required; performing balance and stroke checking for the normalized patterns in the absence of the requirement for the return check, wherein the balance checking is performed by using a relationship of weight on the relative position and wherein the stroke checking is performed by checking a direction of the straight line elements, a rotational direction of the arc elements and a link structure of the elements; and detail-classifying the normalized patterns in such a manner that an orientation of the arc elements, and a length ratio of the elements so as to thereby recognize the character patterns. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification