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US5361309A
Expired / Lapsed
US
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Character recognition apparatus and method with low-resolution storage for character extraction
Assignee: Canon Inc
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Filing: 1993-12-23
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Granted: 1994-11-01
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Expires: 2013-12-23
Abstract
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.
Inventors
- 👤 Mitsumasa Sugiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:18
CPC Classifications
G; G06; G06V; G06V30/00; G06V30/10; G06V30/24; G06V30/248; G06V30/2504
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
139 words
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.
Claim 2
Dependent Claim
139 words
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.
Claim 3
Dependent Claim
33 words
A character recognition apparatus as claimed in claim 1, wherein said recognition means uses data of a wider range than the corresponding area of said image data stored in said first memory means.
Claim 4
Dependent Claim
33 words
A character recognition apparatus according to claim 1, wherein said extracting by said extraction means is performed by counting dot-information of the image data in said first memory in horizontal and vertical directions.
Claim 5
Dependent Claim
21 words
A character recognition apparatus according to claim 1, wherein said selecting means selects a larger amended area from the extracted area.
Claim 6
Dependent Claim
28 words
A character recognition apparatus according to claim 4, wherein the selected area is amended within a value between 0 and a ratio of the low-resolution to the high-resolution.
Claim 7
Dependent Claim
39 words
A character recognition apparatus according to claim 1, further comprising converting means for converting a coordinate value indicating the extracted area to a coordinate value indicating the selected area according to the ratio of the low-resolution to the high-resolution.
Claim 8
Dependent Claim
114 words
A character recognition method, comprising the steps of: 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.
Claim 9
Dependent Claim
114 words
A character recognition method, comprising the steps of: 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.
Claim 10
Dependent Claim
41 words
A character recognition method as claimed in claim 7, wherein the step of recognizing image data corresponding to characters comprises selecting image data of a wider range than the corresponding character area of said image data stored in said first memory.
Claim 11
Dependent Claim
29 words
A character recognition method according to claim 7, wherein said extracting is performed by counting dot-information of the image data in said first memory in horizontal and vertical directions.
Claim 12
Dependent Claim
21 words
A character recognition method according to claim 7, wherein said selecting step selects a larger amended area from the extracted area.
Claim 13
Dependent Claim
28 words
A character recognition method according to claim 10, wherein the selected area is amended within a value between 0 and a ratio of the low-resolution to the high-resolution.
Claim 14
Dependent Claim
39 words
A character recognition method according to claim 7, further comprising a step for converting a coordinate value indicating the extracted area to a coordinate value indicating the selected area according to the ratio of the low-resolution to the high-resolution.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-10-31 | 1998-05-02 | 1998-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-31 | 2002-05-02 | 2002-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-31 | 2006-05-02 | 2006-11-01 | $7700.00 | Window Closed / Lapsed |