US4286293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser scanning and multiple detection for video image processing
Assignee: AT&T Inc
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Filing: 1979-05-30
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Granted: 1981-08-25
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Expires: 1999-05-30
Abstract
Abstract An object (12) is raster scanned with a small, localized beam of laser light (22) and the backscattered radiation therefrom is monitored by a plurality of detectors (44). Each of the detectors (44) monitors a different characteristic of the backscattered radiation and an arithmetic operation is performed on the output of the detectors to provide a single composite video signal with enhanced contrast.
Inventors
- 👤 Donald P. Jablonowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:13
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
121 words
A method for obtaining an enhanced video signal, representing a ceramic substrate having a metallic pattern thereon, the method comprising the steps of: raster scanning a narrow beam of illumination over the surface of the patterned substrate; monitoring radiation scattered by the scattered substrate with a plurality of detectors wherein a first detector detects radiation scattered at low angles by the surface of the patterned substrate while a second detector detects the radiation scattered at high angles by said surface; generating a video signal at the output of each detector, each video signal representing the scattered radiation impinging thereon; and subtracting the video output of the second detector from the first detector to form a composite video signal having enhanced contrast.
Claim 2
Independent Claim
121 words
A method for obtaining an enhanced video signal, representing a ceramic substrate having a metallic pattern thereon, the method comprising the steps of: raster scanning a narrow beam of illumination over the surface of the patterned substrate; monitoring radiation scattered by the scattered substrate with a plurality of detectors wherein a first detector detects radiation scattered at low angles by the surface of the patterned substrate while a second detector detects the radiation scattered at high angles by said surface; generating a video signal at the output of each detector, each video signal representing the scattered radiation impinging thereon; and subtracting the video output of the second detector from the first detector to form a composite video signal having enhanced contrast.
Claim 3
Independent Claim
124 words
A method for obtaining an enhanced video signal, representing a printed wiring board having a metallic pattern thereon, the method comprising the steps of: raster scanning a narrow beam of illumination over the surface of the printed wiring board; monitoring radiation scattered by the surface of the printed wiring board with a plurality of detectors wherein a first detector detects radiation scattered at low angles by the surface while a second detector detects the radiation scattered at high angles by said board surface; generating a video signal at the output of each detector, each video signal representing the scattered radiation impinging thereon; and subtracting the video output of the second detector from the first detector to form a composite video signal having enhanced contrast.
Claim 4
Independent Claim
124 words
A method for obtaining an enhanced video signal, representing a printed wiring board having a metallic pattern thereon, the method comprising the steps of: raster scanning a narrow beam of illumination over the surface of the printed wiring board; monitoring radiation scattered by the surface of the printed wiring board with a plurality of detectors wherein a first detector detects radiation scattered at low angles by the surface while a second detector detects the radiation scattered at high angles by said board surface; generating a video signal at the output of each detector, each video signal representing the scattered radiation impinging thereon; and subtracting the video output of the second detector from the first detector to form a composite video signal having enhanced contrast.
Claim 5
Independent Claim
124 words
A method for obtaining an enhanced video signal representing a polished semiconductor wafer having diffusive portions on the surface thereof, the method comprising the steps of: raster scanning a narrow beam of illumination over the surface of the wafer; monitoring radiation scattered by the surface of the wafer with a plurality of detectors wherein a first detector detects radiation scattered at low angles by the surface of the wafer while a second detector detects the radiation scattered at high angles by said surface; generating a video signal at the output of each detector, each video signal representing the scattered radiation impinging thereon; and subtracting the video output of the second detector from the first detector to form a composite video signal having enhanced contrast.
Claim 6
Independent Claim
124 words
A method for obtaining an enhanced video signal representing a polished semiconductor wafer having diffusive portions on the surface thereof, the method comprising the steps of: raster scanning a narrow beam of illumination over the surface of the wafer; monitoring radiation scattered by the surface of the wafer with a plurality of detectors wherein a first detector detects radiation scattered at low angles by the surface of the wafer while a second detector detects the radiation scattered at high angles by said surface; generating a video signal at the output of each detector, each video signal representing the scattered radiation impinging thereon; and subtracting the video output of the second detector from the first detector to form a composite video signal having enhanced contrast.
Claim 7
Independent Claim
131 words
A method for obtaining an enhanced video signal representing a ceramic substrate having a metallic pattern thereon, the method comprising the steps of: raster scanning a narrow beam of polarized illumination over the surface of the patterned substrate; monitoring the radiation scattered by the surface of the patterned substrate with a plurality of detectors wherein a first detector detects a parallel component of the radiation scattered at low angles by the surface while a second detector detects an orthogonal component of the radiation scattered at high angles by said surface; generating a video signal at the output of each detector, each video signal representing the scattered radiation impinging thereon; and substracting the video output of the second detector from the first detector to form a composite video signal having enhanced contrast.
Claim 8
Independent Claim
131 words
A method for obtaining an enhanced video signal representing a ceramic substrate having a metallic pattern thereon, the method comprising the steps of: raster scanning a narrow beam of polarized illumination over the surface of the patterned substrate; monitoring the radiation scattered by the surface of the patterned substrate with a plurality of detectors wherein a first detector detects a parallel component of the radiation scattered at low angles by the surface while a second detector detects an orthogonal component of the radiation scattered at high angles by said surface; generating a video signal at the output of each detector, each video signal representing the scattered radiation impinging thereon; and substracting the video output of the second detector from the first detector to form a composite video signal having enhanced contrast.
Claim 9
Independent Claim
132 words
A method for obtaining an enhanced video signal representing a printed wiring board having a metallic pattern thereon, the method comprising the steps of: raster scanning a narrow beam of polarized illumination over the surface of the printed wiring board; monitoring the radiation scattered by the surface of the board with a plurality of detectors wherein a first detector detects a parallel component of the radiation scattered at low angles by the surface while a second detector detects an orthogonal component of the radiation scattered at high angles by said surface; generating a video signal at the output of each detector, each video signal representing the scattered radiation impinging thereon; and subtracting the video output of the second detector from the first detector to form a composite video signal having enhanced contrast.
Claim 10
Independent Claim
132 words
A method for obtaining an enhanced video signal representing a printed wiring board having a metallic pattern thereon, the method comprising the steps of: raster scanning a narrow beam of polarized illumination over the surface of the printed wiring board; monitoring the radiation scattered by the surface of the board with a plurality of detectors wherein a first detector detects a parallel component of the radiation scattered at low angles by the surface while a second detector detects an orthogonal component of the radiation scattered at high angles by said surface; generating a video signal at the output of each detector, each video signal representing the scattered radiation impinging thereon; and subtracting the video output of the second detector from the first detector to form a composite video signal having enhanced contrast.
Claim 11
Independent Claim
132 words
A method for obtaining an enhanced video signal representing a polished semiconductor wafer having diffusive portions on the surface thereof, the method comprising the steps of: raster scanning a narrow beam of polarized illumination over the surface of the wafer; monitoring the radiation scattered by the surface of the wafer with a plurality of detectors wherein a first detector detects a parallel component of the radiation scattered at low angles by the surface while a second detector detects an orthogonal component of the radiation scattered at high angles by said surface; generating a video signal at the output of each detector, each video signal representing the scattered radiation impinging thereon; and subtracting the video output of the second detector from the first detector to form a composite video signal having enhanced contrast.
Claim 12
Independent Claim
132 words
A method for obtaining an enhanced video signal representing a polished semiconductor wafer having diffusive portions on the surface thereof, the method comprising the steps of: raster scanning a narrow beam of polarized illumination over the surface of the wafer; monitoring the radiation scattered by the surface of the wafer with a plurality of detectors wherein a first detector detects a parallel component of the radiation scattered at low angles by the surface while a second detector detects an orthogonal component of the radiation scattered at high angles by said surface; generating a video signal at the output of each detector, each video signal representing the scattered radiation impinging thereon; and subtracting the video output of the second detector from the first detector to form a composite video signal having enhanced contrast.
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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) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |