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Patent US3617629A successfully refreshed from Google Patents.
US3617629A
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US
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Pattern detection apparatus
Assignee: NAT RES DEV
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Filing: 1969-01-10
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Granted: 1971-11-02
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Expires: 1989-01-10
Abstract
Abstract In apparatus for detecting cervical smears on microscope slides, an image of the field is scanned with a television-type scan and a detector detects any light changes caused when the scan crosses the boundary of a distinctive area. On the detection of such an area the apparatus switches to a tracing mode which traces around the area with a step-by-step motion in a series of small orthogonal steps and the coordinates of the stepping points are stored. Eventually the scan returns to its original starting point after which the television pattern scan continues until the next area is detected.
Inventors
- 👤 Brian Dennis Mccarthy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:00
CPC Classifications
G; G06; G06V; G06V10/00; G06V10/10; G06V10/20; G06V10/24; G06V30/00; G06V30/10; G06V30/14; G06V30/144
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
156 words
Pattern detection apparatus comprising: means for causing a light beam to scan a field in a raster of lines, means for detecting changes in a light response from said field produced when said beam crosses a boundary of a distinctive area in the field, means for deflecting said beam in small steps alternately in two orthogonal directions in response to said means for detecting and for causing said beam to thereby trace around said boundary of the area, said deflecting means being actuated each time said means for detecting detects a change in light response from said field, storage means for storing coordinate valves of the said deflection means, said means for deflecting being consTructed to respond to said detection means for deflecting said beam back one small step upon detecting said change in light response, and said storage means being constructed to store coordinates of the position to which said beam has been stepped back.
Claim 2
Dependent Claim
156 words
Pattern detection apparatus comprising: means for causing a light beam to scan a field in a raster of lines, means for detecting changes in a light response from said field produced when said beam crosses a boundary of a distinctive area in the field, means for deflecting said beam in small steps alternately in two orthogonal directions in response to said means for detecting and for causing said beam to thereby trace around said boundary of the area, said deflecting means being actuated each time said means for detecting detects a change in light response from said field, storage means for storing coordinate valves of the said deflection means, said means for deflecting being consTructed to respond to said detection means for deflecting said beam back one small step upon detecting said change in light response, and said storage means being constructed to store coordinates of the position to which said beam has been stepped back.
Claim 3
Dependent Claim
45 words
Apparatus as claimed in claim 1 in which the scanning means comprises a clock pulse generator, a first divider circuit for providing a line scan and a second divider circuit connected to receive the output of the first divider circuit for providing the frame scan.
Claim 4
Dependent Claim
44 words
Apparatus as claimed in claim 2 in which gating means are included to gate the pulse train from the pulse generator to the first divider circuit which gating means is closed by the detection means when the boundary of an area has been detected.
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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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |