US4772945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surveillance system
Assignee: Sony Corp
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Filing: 1987-05-11
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Granted: 1988-09-20
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Expires: 2007-05-11
Abstract
Abstract A surveillance system having self-test functions having an image pick-up sensor, an image processing unit connected to the image pick-up sensor for detecting a scene change of video signals obtained from the image pick-up sensor, an alarm generator connected to the image processing unit for generating alarm signals based on the detection of the scene change, and a self-tester including noise signals to be superimposed on the video signals to be supplied to the image processing unit as a quasi-scene change information.
Inventors
- 👤 Susumu Tagawa
- 👤 Hiromi Okitsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:52
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/18; G08B13/189; G08B13/194; G08B13/196; G08B13/19678; G08B13/1968; G08B13/19602; G08B13/1961; G08B13/19634; G08B13/19639; G08B13/19645; G08B29/00; G08B29/12; G08B29/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
137 words
A surveillance system having self-test functions, comprising, in combination: image pick-up means; manually adjustable threshold setting means for adjustably setting a threshold level; image processing means connected to said image pick-up means for detecting a scene change represented by a change in that portion of video signals obtained from said image pick-up means which excceeds the threshold level set by said threshold setting means; alarm means connected to said image processing means for generating alarm signals in response to detection of a scene change; and self-test means including a generator of noise signals and means for superimposing said noise signals on said video signals to be supplied to said image processing means as quasi-scene change information, whereby the operability of the threshold level set by said threshold setting means is verified by operation of said alarm means.
Claim 2
Dependent Claim
137 words
A surveillance system having self-test functions, comprising, in combination: image pick-up means; manually adjustable threshold setting means for adjustably setting a threshold level; image processing means connected to said image pick-up means for detecting a scene change represented by a change in that portion of video signals obtained from said image pick-up means which excceeds the threshold level set by said threshold setting means; alarm means connected to said image processing means for generating alarm signals in response to detection of a scene change; and self-test means including a generator of noise signals and means for superimposing said noise signals on said video signals to be supplied to said image processing means as quasi-scene change information, whereby the operability of the threshold level set by said threshold setting means is verified by operation of said alarm means.
Claim 3
Dependent Claim
41 words
A surveillance system as claimed in claim 1, wherein said self-test means further includes timer means, and means for controlling the superimposing of said noise signal on said video signals at predetermined times, in response to operation of said timer means.
Claim 4
Dependent Claim
33 words
A surveillance system as claimed in claim 2, further comprising a printing system which prints images of said video signals in response to detection of said scene change by said image processing means.
Claim 5
Dependent Claim
41 words
A survei11ance system as claimed in claim 1, wherein said image pick-up means includes a plurality of TV cameras, switching means for cyclically selecting different ones of said cameras to supply video signals to said image processing means at predetermined times.
Claim 6
Dependent Claim
39 words
A surveillance system as claimed in claim 4, wherein said noise signals are superimposed on the video signals of each of said TV cameras, and wherein said switching means includes means to select cyclically one of noise-superimposed video signals.
References Cited (Backward Citations)
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Cited
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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) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |