Character recognition method for recognizing character in an arbitrary rotation position
First Claim
1. A character recognition method comprising steps of:
- reading a document having characters displayed thereon and entering document data representative of the content of the document;
extracting image data representative of one of the characters from the document data, said one character having an orientation rotated by an arbitrary rotation angle from a predefined reference position for said one character;
extracting a first feature quantity of said one character;
converting the extracted feature quantity into a second feature quantity of said one character in the reference position based on said arbitrary rotation angle;
referring to a dictionary which contains stored feature quantities of a plurality of characters in the reference position so as to find a primary candidate character which has a feature quantity matching or most closely resembling the second feature quantity; and
selecting said primary candidate character as said one character.
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Abstract
A character recognition method includes reading a document having characters displayed thereon and entering a document data representative of the content of the document. Image data of one of the characters from the document data is extracted. The one character has an orientation rotated by an arbitrary rotation angle from a predefined reference position for the one character. A first feature quantity of the one character is extracted from the extracted image data. The extracted feature quantity is converted into a second feature quantity of the one character in the reference position based on the arbitrary rotation angle. A dictionary which contains stored feature quantities of a plurality of characters in the reference position is interrogated so as to find a primary candidate character which has a feature quantity matching or most closely resembling the converted feature quantity.
74 Citations
30 Claims
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1. A character recognition method comprising steps of:
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reading a document having characters displayed thereon and entering document data representative of the content of the document; extracting image data representative of one of the characters from the document data, said one character having an orientation rotated by an arbitrary rotation angle from a predefined reference position for said one character; extracting a first feature quantity of said one character; converting the extracted feature quantity into a second feature quantity of said one character in the reference position based on said arbitrary rotation angle; referring to a dictionary which contains stored feature quantities of a plurality of characters in the reference position so as to find a primary candidate character which has a feature quantity matching or most closely resembling the second feature quantity; and selecting said primary candidate character as said one character. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A character recognition method comprising steps of:
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reading an original document having characters displayed thereon; storing document data representative of the character content of the document; extracting image data representative of one of said characters from said document data, said one character having a first orientation; extracting a firs feature quantity of said one character from said image data; converting said first feature quantity into a second feature quantity based on a predetermined relationship between said first orientation and a second predefined orientation for said one character that is different from said first orientation; referring to a dictionary which stores feature quantities of a plurality of characters in said second orientation so as to fund a primary candidate character that has a feature quantity matching or closely resembling said second feature quantity; and selecting said primary candidate character as said one character. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification