Monitoring system for monitoring a field
First Claim
1. A monitoring system for monitoring a field for the detection of motion of objects within a given area, the system comprising a detection stage provided with a camera for signal recording with respect to the area to be monitored, a processing stage provided with a storage device and a comparison circuit for producing comparison signals in dependence on differences and signal agreements, respectively, between signals produced by the camera and delayed and not delayed in the storage device, said comparison circuit comprising a selective switching-on stage having an intervention device actuated in dependence on the number of comparison signals, wherein the system comprises at least two cameras spaced apart and being arranged at a different angle with respect to the area to be monitored by the cameras, each camera being connected through a processing stage to said, single, selective switching-on stage which further comprises means for adding together the comparison signals derived from the different camera signals, and a threshold device coupled between the intervention device and an output of the adding means delivering the sum of the comparison signals.
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Accused Products
Abstract
Monitoring system particularly for detecting the presence of moving persons in a monitored area.
This system comprises two detection stages 2 and 22, two processing stages 3 and 23 and a selective switching-on stage 4 which the two groups of stages 2, 22 and 3, 23 have in common. Each one of the detection stages 2 and 22, which comprise cameras 7 and 27, respectively, send field signals to the associated processing stages, these signals corresponding with the observed images. Each processing stage sequentially compares the signal values in the field signals which the stage receives in accordance with a controllable pre-determined rhythm, whereafter it sends comparison signals, whose number is proportional to the magnitude of the observed motion by comparing the field signals, to the switching-on stage 4. When the sum of the two numbers of signals received by the switching-on stage 4 is greater than the threshold value present in the threshold circuit an intervention device 17 is actuated.
Use: Protecting rooms from burglary or hold-ups. Reference: FIG. 1.
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Citations
6 Claims
- 1. A monitoring system for monitoring a field for the detection of motion of objects within a given area, the system comprising a detection stage provided with a camera for signal recording with respect to the area to be monitored, a processing stage provided with a storage device and a comparison circuit for producing comparison signals in dependence on differences and signal agreements, respectively, between signals produced by the camera and delayed and not delayed in the storage device, said comparison circuit comprising a selective switching-on stage having an intervention device actuated in dependence on the number of comparison signals, wherein the system comprises at least two cameras spaced apart and being arranged at a different angle with respect to the area to be monitored by the cameras, each camera being connected through a processing stage to said, single, selective switching-on stage which further comprises means for adding together the comparison signals derived from the different camera signals, and a threshold device coupled between the intervention device and an output of the adding means delivering the sum of the comparison signals.
Specification