JPH06178300A - Picture monitoring system - Google Patents

Abstract

PURPOSE:To record a status picture after the generation of each alarm even when an alarm is generated intermittently or continuously in the picture monitoring system. CONSTITUTION:When an alarm is generated in one of alarm sensors 31-3N, a picture output of a camera corresponding to the alarm is selected by a changeover device 2 and M-picture portion is recorded continuously while feeding to a 1st video memory 7 and thereafter stopped. In response to the succeeding alarm, the output of each of the cameras 11-1N is selected sequentially by the changeover device 2 one by one picture and fed to a 2nd video memory 8 and recorded, A first alarm picture is stored in a 1st video memory 7 by M pictures and succeeding alarm pictures are stored in the 2nd video memory 8 by one picture without fail, then the picture of all alarm events is grasped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image monitoring system, and more particularly to an image monitoring system which receives an alarm and automatically monitors an alarm occurrence location.

[0002]

2. Description of the Related Art An example of the configuration of a conventional image monitoring system of this type is shown in FIG. N monitoring cameras 11 to 1N and N alarm sensors 31 to 3N which are provided corresponding to the respective monitoring cameras 11 to 1N and which generate an alarm by detecting an abnormality in a monitoring place of the corresponding monitoring camera. And are provided.

Image outputs from the surveillance cameras 11 to 1N are selectively derived by the switch 2 and input to the video memory 6 for recording. This video memory 6 has a capacity capable of recording an input image for M screens, and is normally (sensors 31 to 3).
When an alarm is not generated by N), the output images of the cameras 11 to 1N are sequentially switched at a constant time interval and supplied to the video memory 6 under the control of the control device 4.

Here, one screen of camera image output means one
An image corresponding to a field or one frame is referred to, and the same shall apply hereinafter.

The controller 4 includes a switch 2 and a video memory 6
Of the alarm sensors 31 to 3
When no alarm is generated from N, the switching device 2 is controlled to control the cameras 11 to 1 at a constant cycle as described above.
The N output is sequentially switched and supplied to the video memory 6.

Now, for example, assuming that there are four cameras and the capacity of the video memory 6 corresponds to 32 screens, the control device selects each image output of the cameras 11 to 14 at a time cycle corresponding to 32 screens. It is sequentially derived one by one and supplied to the video memory 6 for recording control. Therefore, normally, when the image output of one camera 11 is recorded in the video memory 6 for 32 screens, the image output of the camera 12 is newly recorded in the video memory 6 for 32 screens, and the previous camera 11 is recorded. The screen disappears, but there is no problem because it is normal in this normal time.

The recording screen of the video memory 6 can be monitored by the image monitor 5.

When an alarm occurs in one of the alarm lancers 31 to 3N, the controller 4 responds to this by controlling the switch 2 to select the output of the surveillance camera corresponding to this sensor. Therefore, the image of the surveillance camera at the location where the alarm is generated is supplied to the video memory 6 for 32 screens and recorded. When the image for 32 screens has been recorded in the video memory 6, the control device 4 controls the recording in the video memory 6 to be stopped, and thereafter, the image at the alarm occurrence position is held until the recording is restarted by the cancel instruction. is there. The image search of the video memory 6 can be freely performed on the image monitor 5 by changing the mode from recording to reproduction.

[0009]

In such a conventional image monitoring system as described above, when an alarm is received, the video memory records an image for a predetermined screen and then becomes a stopped state. Therefore, when an alarm occurs next from another monitoring place, there is a drawback that the image of the place corresponding to the alarm cannot be recorded. As a method of solving this, it is conceivable to install a video memory corresponding to each camera, but this is not a measure that invites an increase in system cost.

Therefore, the present invention has been made to solve the drawbacks of the prior art, and its purpose is to provide an alarm even if the alarm is intermittently or continuously generated with a simple structure. An object is to provide an image monitoring system capable of recording an image immediately after the occurrence.

[0011]

An image monitoring system according to the present invention comprises a plurality of surveillance cameras, and a plurality of sensors provided corresponding to the surveillance cameras for detecting an abnormality in the surveillance place of the corresponding surveillance cameras. Selection means capable of selectively deriving each output of the surveillance camera, first and second recording means capable of recording a plurality of output images derived by the selection means, and when an alarm is not generated from the sensor The outputs of the plurality of surveillance cameras are supplied to the first recording means while being selectively controlled at regular time intervals, and the outputs of the surveillance cameras corresponding to the sensors that have generated this alarm in response to the generation of the first alarm. Are selectively controlled and supplied to the first recording means, and in response to an alarm occurrence after the first alarm, each output of the surveillance camera is selectively controlled one screen at a time to sequentially output the second recording means. Characterized in that it comprises a supply control means.

[0012]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, and the same parts as those in FIG. 2 are designated by the same reference numerals. In this embodiment, N monitoring cameras 11 to 1N, alarm sensors 31 to 3N provided corresponding to these cameras for detecting an abnormality in a monitoring place of the corresponding cameras and generating an alarm, and receiving these alarms. A control device 4 that controls the switch 2 and the video memories 7 and 8, a switch 2 that selectively derives the image output of the N monitoring cameras 11 to 1N, and an alternative image output of the switch 2. It has first and second video memories 7 and 8 for recording and reproducing under the control of the control device 4, and an image monitor 5 for displaying reproduced images of both video memories 7 and 8.

In such a configuration, the alarm sensor 31
During normal times when there is no alarm from ~ 3N,
Similarly to the conventional example, the control device 4 controls the switching device 2 to sequentially and selectively switch the image output of each of the cameras 11 to 1N at a constant cycle and supply the image output to the first video memory 7.

This fixed period is a period corresponding to the recording capacity of the first video memory 7 (if the memory 7 has a recording capacity of M screens, the image output of each camera is continuously stored for M screens. However, the present invention is not limited to this. In this normal time, the second video memory 8
Does not operate at all, and neither recording nor reproduction is performed.

Now, when an alarm is generated from one of the alarm sensors 31 to 3N, the control device 4 responds to this by switching to select the image output of the surveillance camera corresponding to the sensor which generated this alarm. Control device 2. Therefore, the first video memory 7 records an image of a portion where an alarm occurs and an abnormality occurs, and when recording of M screens is completed,
After that, recording is stopped and the abnormally generated image is held for M screens.

Therefore, if this holding screen is monitored by the monitor 5, it is possible to determine the abnormal state.

Subsequently, when an alarm is generated from one of the alarm sensors 31 to 3N, the control device 4 responds to the alarm by sequentially switching the output images of the monitoring cameras 11 to 1N one by one. 2 is controlled, and the second video memory 8 is instructed to sequentially record the switching output.

Accordingly, the first video memory 7 records M screens of images of abnormal parts at the time of the first alarm occurrence, and the second video memory 8 stores images of abnormal parts at the subsequent alarm occurrence. All cameras 11 to 1N including
Each one screen image is sequentially recorded.

For example, assuming that the number of cameras is four and the capacities of both video memories 7 and 8 are 32 screens, the second video memory 8 has 4 screens each of 4 camera output images.
Eight sets (32/4 = 8) are recorded with one set as a set. When all of these 8 sets of recording screens have been recorded, the capacity of the second video memory 8 becomes full, so that the first video memory 8 is returned to the beginning again,
Recording of each screen is resumed.

Therefore, even if an alarm is generated subsequent to the first alarm, since the image output of each camera is recorded in the second video memory 8 one screen at a time, the subsequent confirmation of the images corresponding to all the alarms is performed. You can do it.

It is needless to say that each numerical value in the above embodiment is merely a short example, and various modifications can be made.

[0023]

As described above, according to the present invention, in addition to the first video memory for continuously recording the image of the portion where the alarm is first generated for M screens, all the images of the surveillance camera are screened one by one. Since a second video memory for recording is added,
Even if the alarms occur intermittently or continuously, it is possible to confirm the images immediately after the individual alarms with a simple structure, and it is possible to prevent the abnormal event from being missed.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a conventional image monitoring system.

[Explanation of symbols]

 11-1N Surveillance camera 2 Switching device 31-3N Alarm sensor 4 Control device 5 Image monitor 7, 8 Video memory

Claims (2)

[Claims] 1. A plurality of surveillance cameras, a plurality of sensors provided corresponding to the surveillance cameras to detect an abnormality of a surveillance place of the corresponding surveillance cameras, and outputs of the surveillance cameras are selectively derived. Possible selection means, first and second recording means capable of storing a plurality of screens of output images derived from the selection means, and output of the plurality of surveillance cameras at fixed time intervals when an alarm is not generated from the sensor. Is sequentially supplied to the first recording means while being selectively controlled, and in response to the occurrence of the first alarm, the output of the surveillance camera corresponding to the sensor that has generated this alarm is selectively controlled to the first recording means. And a control means for supplying and controlling each output of the surveillance camera one screen at a time in response to the occurrence of the alarm after the first alarm and sequentially supplying the output to the second recording means. Image supervisor Vision system. 2. The control means outputs the output of the monitoring camera corresponding to the sensor that has generated the first alarm to the first camera.
2. When supplying to the recording means of the above, when the recording of a preset number of screens is completed, the output supply to the recording means is controlled to be stopped. Image surveillance system.