Surveillance system
First Claim
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1. 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.
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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.
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Citations
5 Claims
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1. A surveillance system having self-test functions, comprising, in combination:
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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. - View Dependent Claims (2, 3, 4, 5)
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Specification