US3889234A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Feature extractor of character and figure
Assignee: Hitachi Ltd
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Filing: 1973-10-04
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Granted: 1975-06-10
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Expires: 1993-10-04
Abstract
Abstract From a register in which a two-valued pattern is stored there is sequentially extracted information along three vertical scanning lines, from which information over the region of 3 by 3 bits is selectively extracted in succession by means of data selectors. Features are searched by comparing the thus extracted information with a mask having a predetermined pattern in bits. The feature extractor of character and figure is adapted to store the variety, coordinate and total number of the thus searched features to separate registers for comparison with the features of standard characters.
Inventors
- 👤 Hiroshi Makihara
- 👤 Toshihiro Hananoi
- 👤 Yoshiji Fujimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:29
CPC Classifications
G; G06; G06V; G06V30/00; G06V30/10; G06V30/18; G06V30/1801; G06V30/18019
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
206 words
A feature extractor of character and figure comprising: first register means for storing a thinned, two-valued pattern of the character and figure; information extractor means including n second register means for receiving from said first register means information along n consecutive predetermined scanning lines in said pattern of the character and figure, address signal generator means for generating address signals which address m positions in each of said predetermined scanning lines, and data selector means for receiving information from said second register means and said address signal generator means to simultaneously generate information of n by m, where n and m are integers; search mask circuit means for searching coincidence of information extracted by said information extractor means with patterns of search masks each having a predetermined pattern representative of the feature after comparison therewith; counter means for counting the number of feature signals searched by said search mask circuit means to obtain the total number of the features; third register means for storing signals representative of the variety of the signal searched by said search mask circuit means; and fourth register means for storing signals representative of the coordinate on the character and figure of the feature signals searched by said search mask circuit means.
Claim 2
Dependent Claim
206 words
A feature extractor of character and figure comprising: first register means for storing a thinned, two-valued pattern of the character and figure; information extractor means including n second register means for receiving from said first register means information along n consecutive predetermined scanning lines in said pattern of the character and figure, address signal generator means for generating address signals which address m positions in each of said predetermined scanning lines, and data selector means for receiving information from said second register means and said address signal generator means to simultaneously generate information of n by m, where n and m are integers; search mask circuit means for searching coincidence of information extracted by said information extractor means with patterns of search masks each having a predetermined pattern representative of the feature after comparison therewith; counter means for counting the number of feature signals searched by said search mask circuit means to obtain the total number of the features; third register means for storing signals representative of the variety of the signal searched by said search mask circuit means; and fourth register means for storing signals representative of the coordinate on the character and figure of the feature signals searched by said search mask circuit means.
Claim 3
Dependent Claim
46 words
A feature extractor according to claim 1, wherein said n second register means receives from said first register means information along n consecutive vertical scanning lines and said address signal generator means generates address signals which address m positions in each of said vertical scanning lines.
Claim 4
Dependent Claim
40 words
A feature extractor according to claim 2, wherein said search mask circuit means provides an output of feature signals indicative of each coincidence of the information extracted by said information extractor means and the predetermined patterns of said search mask.
Claim 5
Dependent Claim
72 words
A feature extractor according to claim 3, wherein said counter means counts the number of feature signals provided by said search mask circuit means, said third register means stores signals representative of the variety of the feature signals provided by said search mask circuit means, and said fourth register means stores signals representative of the coordinate on the character and figure of the feature signals provided by said search mask circuit means.
Claim 6
Dependent Claim
17 words
A feature extractor according to claim 1, wherein said n second register means are parallel connected registers.
Claim 7
Dependent Claim
28 words
A feature extractor according to claim 5, further comprising gating means connected between said parallel connected registers and between said first register means and said parallel connected registers.
Claim 8
Dependent Claim
40 words
A feature extractor according to claim 3, further comprising decoder means for discriminating the variety of features in accordance with the feature output signals of said search mask circuit means, said decoder means providing output signals to said counter means.
Claim 9
Dependent Claim
35 words
A feature extractor according to claim 7, further comprising encoder means responsive to the output signals of said decoder means for providing signals representative of the variety of features discriminated to said third register means.
Claim 10
Dependent Claim
23 words
A feature extractor according to claim 1, wherein said search mask circuit means includes search masks for detecting edge points and branch points.
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) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |