Character recognition apparatus using modification of a characteristic quantity
First Claim
1. A character recognition apparatus supplied with image data, comprising:
- a dictionary memory for memorizing sets of characteristic quantity elements, each set corresponding to one of a plurality of characters; and
a recognition processor includingcharacteristic quantity extracting means for extracting a set of characteristic quantity elements representing directional line segments extracted from a contour image of a character image included within the image data and varying with changes in dimensions of the character image;
character search means for determining a character corresponding to the character image included within the image data by comparing the set of characteristic quantity elements extracted from the image data with the sets of characteristic quantity elements of the characters memorized in said dictionary memory; and
characteristic quantity magnification/reduction means for modifying the set of characteristic quantity elements output from said characteristic quantity extracting means, by multiplying each element in the set of characteristic quantity elements by a scalar quantity to equalize the scale of the character image included within the image data with the scale of at least one of the characters for which the sets of characteristic quantity elements are memorized in said dictionary memory, before said character search means performs the comparing.
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Abstract
A character recognition apparatus for detecting a character which is represented by an image data, by extracting a characteristic quantity of the character from the image data of the character, and comparing the characteristic quantity with characteristic quantities of characters which are memorized in a dictionary. Before the above comparison, a modification of the above characteristic quantity which is extracted from the image data is carried out, where the modification corresponds to a magnification or reduction of the scale of the above image data to equalize the scale of of the above image data of the character with the scales of the characters of which the characteristic quantities are memorized in the above dictionary. Further, a magnification or reduction of the width of the character image to equalize the width of of the character image with the width of the characters of which the characteristic quantities are memorized in the above dictionary.
45 Citations
5 Claims
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1. A character recognition apparatus supplied with image data, comprising:
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a dictionary memory for memorizing sets of characteristic quantity elements, each set corresponding to one of a plurality of characters; and a recognition processor including characteristic quantity extracting means for extracting a set of characteristic quantity elements representing directional line segments extracted from a contour image of a character image included within the image data and varying with changes in dimensions of the character image; character search means for determining a character corresponding to the character image included within the image data by comparing the set of characteristic quantity elements extracted from the image data with the sets of characteristic quantity elements of the characters memorized in said dictionary memory; and characteristic quantity magnification/reduction means for modifying the set of characteristic quantity elements output from said characteristic quantity extracting means, by multiplying each element in the set of characteristic quantity elements by a scalar quantity to equalize the scale of the character image included within the image data with the scale of at least one of the characters for which the sets of characteristic quantity elements are memorized in said dictionary memory, before said character search means performs the comparing. - View Dependent Claims (4)
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2. A character recognition apparatus supplied with image data, comprising:
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a dictionary memory, for memorizing sets of characteristic quantity elements, each set corresponding to one of a plurality of characters; and a recognition processor including characteristic quantity extracting means for extracting a set of characteristic quantity elements representing directional line segments extracted from a contour image of a character image included within the image data in a character region and varying with changes in dimensions of the character image; character search means for determining a character corresponding to the character image included within the image data by comparing the set of characteristic quantity elements extracted from the image data with the sets of characteristic quantity elements of the characters memorized in said dictionary memory; character image modification means for carrying out a modification of the image data in said character region, said modification including at least one of thickening and thinning operations of the character image included within the image data, and said modification including use of at least one parameter; and characteristic quantity modification means for carrying out a modification of the set of characteristic quantity elements output by said characteristic quantity extracting means, by multiplying each element in the set of characteristic quantity elements of the character image included within the image data by a scalar quantity corresponding to a ratio of the scale of the character image included within the image data to the scale of at least one of the characters represented by the sets of characteristic quantity elements stored in said dictionary memory. - View Dependent Claims (5)
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3. A character recognition apparatus supplied with image data containing at least one character region, each character region including one input character image, said character recognition apparatus comprising:
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a dictionary memory for memorizing sets of characteristic quantity elements of pre-defined characters; and a recognition processor including character image modification means for modifying the image data of the one character image in one of the at least one character region in a plurality of ways based on a plurality of modification parameters, respectively, to generate a plurality of modified character image data containing a plurality of modified input character images; characteristic quantity extracting means for extracting a plurality of sets of characteristic quantity elements of the plurality of modified input character images in the plurality of modified character image data for the one input character image, respectively; character search means for determining the one input character image by comparing each of the sets of characteristic quantity images extracted from the plurality of modified character image data with the characteristic quantity elements of the pre-defined characters memorized in said dictionary memory.
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Specification