US3813646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pattern recognition devices
Assignee: QED Intellectual Property Ltd
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Filing: 1972-10-17
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Granted: 1974-05-28
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Expires: 1992-10-17
Abstract
Abstract An input arrangement for the decision mechanism of a pattern recognition device includes a cathode ray tube arranged to execute a raster of successive scanning sweeps over an area which may include a pattern having an edge. Apparatus is provided for detecting an edge during one scanning sweep and for producing signals indicative of the position co-ordinates of the detected edge. A region of the area adjacent to the detected edge is searched during at least one subsequent sweep to detect an extension of the edge and apparatus is provided for producing further signals indicative of the position coordinates of any such extension. Analyzing means are provided to analyze said signals and to produce input signals respectively representing the position, length, orientation and curvature of a subsequentially circular arc indicative of said edge. Means are provided for applying said input signals to said decision mechanism.
Inventors
- 👤 D Quarmby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:47
CPC Classifications
G; G06; G06V; G06V30/00; G06V30/10; G06V30/18; G06V30/182
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
147 words
An input arrangement for a pattern recognition device comprising: a. analysing apparatus for deriving position signals indicative of the position co-ordinates of points on an edge in a pattern, said apparatus comprising: b. means responsive to said position signals for producing signals indicative of the length of said edge c. means responsive to said position signals for producing signals indicative of the gradient of said edge d. means responsive to said position signals for producing a curvature signal which varies to represent the curvature of said edge, e. threshold means for providing threshold initiation signals when the value of said curvature signal varies by more than a given threshold variation level, and f. edge classifying means responsive to each of said threshold initiation signals for applying said signals indicative of the position, length, gradient and curvature of a respective portion of said edge to a decision mechanism.
Claim 2
Dependent Claim
147 words
An input arrangement for a pattern recognition device comprising: a. analysing apparatus for deriving position signals indicative of the position co-ordinates of points on an edge in a pattern, said apparatus comprising: b. means responsive to said position signals for producing signals indicative of the length of said edge c. means responsive to said position signals for producing signals indicative of the gradient of said edge d. means responsive to said position signals for producing a curvature signal which varies to represent the curvature of said edge, e. threshold means for providing threshold initiation signals when the value of said curvature signal varies by more than a given threshold variation level, and f. edge classifying means responsive to each of said threshold initiation signals for applying said signals indicative of the position, length, gradient and curvature of a respective portion of said edge to a decision mechanism.
Claim 3
Dependent Claim
33 words
An arrangement according to claim 1 including a plurality of different stages rendered successively operative in response to position signals indicative of successive edges for providing further ones of said sets of signals.
Claim 4
Dependent Claim
24 words
An input arrangement according to claim 1, including edge following apparatus for deriving said position signals from a pattern including an edge presented thereto.
Claim 5
Dependent Claim
114 words
An input arrangement for a pattern recognition device according to claim 1, including edge following apparatus for producing said position signals comprising cathode ray tube means for executing a raster of scanning sweeps over a planar area in which there may be a pattern including an edge, means for detecting an edge in the pattern during one of said sweeps, means for producing first position signals indicative of the position coordinates in said area of said detected edge, means for searching on a subsequent sweep a region of said area adjacent said detected edge for an extension thereof, and means for producing further position signals indicative of the position coordinates of any such extension.
References Cited (Backward Citations)
US2968789A
Cited
US3268864A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |