Character recognition apparatus and method with low-resolution storage for character extraction
First Claim
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1. A character recognition apparatus, comprising:
- first memory means for storing low-resolution image data expanding already stored compressed image data;
second memory means for storing high-resolution data expanding the already stored compressed image data;
extraction means for extracting an area in which one character exists from the data in said first memory means by detecting a frequency of dot-information of the image data in said first memory means representing black dots;
selecting means for converting coordinate data of the extracted area in the first memory means to coordinate data in the second memory means and selecting from said second memory means the high-resolution data corresponding to the converted coordinate data; and
recognition means for recognizing the selected high-resolution data of an image of the selected area in said second memory means corresponding to the area extracted by said extracting means.
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Abstract
A character recognizer includes a memory for storing low resolution data of a group of characters to be recognized in an image and a memory for storing high resolution data of the group of characters. Wide range image data for the characters stored in the high resolution memory is selected on the basis of narrower range image data for corresponding characters stored in the low resolution memory. Character recognition is performed according to the selected character image data.
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Citations
12 Claims
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1. A character recognition apparatus, comprising:
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first memory means for storing low-resolution image data expanding already stored compressed image data; second memory means for storing high-resolution data expanding the already stored compressed image data; extraction means for extracting an area in which one character exists from the data in said first memory means by detecting a frequency of dot-information of the image data in said first memory means representing black dots; selecting means for converting coordinate data of the extracted area in the first memory means to coordinate data in the second memory means and selecting from said second memory means the high-resolution data corresponding to the converted coordinate data; and recognition means for recognizing the selected high-resolution data of an image of the selected area in said second memory means corresponding to the area extracted by said extracting means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A character recognition method, comprising the steps of:
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storing low-resolution data expanding already stored compressed image data in a first memory; storing high-resolution data expanding the already stored compressed image data in a second memory; extracting an area in which one character exists from the low-resolution data by detecting a frequency of dot-information of the image data in the first memory representing black dots; converting the coordinate data of the extracted area in the first memory to coordinate data in the second memory and selecting from the second memory the high-resolution data corresponding to the converted coordinate data; and recognizing the high-resolution data of an image of the selected area in the second memory. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification