US4607386A
Expired / Lapsed
US
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Handwritten character recognition device
Assignee: Sharp Corp
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Filing: 1984-10-03
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Granted: 1986-08-19
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Expires: 2004-10-03
Abstract
Abstract A handwritten character recognition device comprises a feature point circuit for recognizing a character with using three feature points for a continuous stroke connecting a first stroke and second strokes. For recognition, both stroke information and stroke connection information between adjacent strokes are read-in per stroke. Therefore, the character can be recognized with a relative position correlation between the stroke number and the stroke shape. Even if the stroke number may be irregularly changed, the inputted character can be recognized without a necessity of storing information for the irregularly changed strokes.
Inventors
- 👤 Toshiaki Morita
- 👤 Masahiro Horii
- 👤 Shigeru Tasaka
- 👤 Hitoshi Hirose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:15
CPC Classifications
G; G06; G06V; G06V10/00; G06V10/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
221 words
A handwritten character recognition device comprising: input means for inputting information of a character by handwriting strokes of the character; extracting means responsive to said input means for extracting a starting point, an intermediate point, and an end point of each of said strokes as feature points; memory means for storing a plurality of standard patterns of characters together with stroke connection information, wherein said memory means further comprises co-ordinate memory means for storing co-ordinate information for said feature points, and signal memory means responsive to said co-ordinate memory means for storing information representative of whether a plurality of strokes of a given character are continuously connected; comparison means responsive to said extracting means for comparing the inputted feature points with the standard patterns; detection means for detecting the lengths of the respective strokes and selecting the three feature points by using the stroke connection information in said memory means, said detection means including means for comparing the lengths of the respective strokes and detecting a longer stroke between two adjacent strokes, and feature point modification means for selecting an intermediate point of the longer stroke as the intermediate of the feature point to be compared thereby combining a plurality of continuously connected strokes; and identifying means responsive to said comparison means and said detection means for identifying the inputted character.
Claim 2
Dependent Claim
221 words
A handwritten character recognition device comprising: input means for inputting information of a character by handwriting strokes of the character; extracting means responsive to said input means for extracting a starting point, an intermediate point, and an end point of each of said strokes as feature points; memory means for storing a plurality of standard patterns of characters together with stroke connection information, wherein said memory means further comprises co-ordinate memory means for storing co-ordinate information for said feature points, and signal memory means responsive to said co-ordinate memory means for storing information representative of whether a plurality of strokes of a given character are continuously connected; comparison means responsive to said extracting means for comparing the inputted feature points with the standard patterns; detection means for detecting the lengths of the respective strokes and selecting the three feature points by using the stroke connection information in said memory means, said detection means including means for comparing the lengths of the respective strokes and detecting a longer stroke between two adjacent strokes, and feature point modification means for selecting an intermediate point of the longer stroke as the intermediate of the feature point to be compared thereby combining a plurality of continuously connected strokes; and identifying means responsive to said comparison means and said detection means for identifying the inputted character.
Claim 3
Dependent Claim
24 words
The device of claim 1, wherein said co-ordinate memory means contains the starting point, the intermediate point, and the end point of each stroke.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-18 | 1990-02-17 | 1990-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-18 | 1994-02-17 | 1994-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-18 | 1998-02-17 | 1998-08-19 | $7700.00 | Window Closed / Lapsed |