JP2000050234A - Remote supervisory system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To build up a supervisory camera system that supervises objects by optionally selecting a video signal from the supervisory cameras installed at a remote place. SOLUTION: A video signal outputted from supervisory cameras 1a, etc. is inputted to code installation sections 2a, etc. where a camera code representing each supervisory camera is installed and the resulting video signals are inputted to a video signal switching section 3 and switched for every prescribed period in the circular permutation. The video signal is inputted to a transmission section 4 to make it a transmission line signal, and it is sent to a video monitor side through a public communication line L1. A reception section 6 of the video monitor side receives the transmitted video signal, a camera code separate section 7 separates the camera code from the video signal and an MPU 9 monitors the camera code. The video monitor side is provided with a camera selection input section 10, that designates the video signal displayed on a video monitor 11 and when the received video signal is a video signal selected by the camera selection input section 10, the video signal is written in a field memory 8 under the control of the MPU 9 and the video signal outputted from the memory 8 is displayed on the video monitor 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surveillance camera system capable of selecting and monitoring a video signal from an arbitrary surveillance camera from a remote place.

[0002]

2. Description of the Related Art A surveillance camera system that installs a surveillance camera in a place where unspecified people gather and displays a video signal from the surveillance camera on a video monitor from a remote place such as a management building to perform safety management. Plays an important role. In a conventional surveillance camera system, video signals output from each surveillance camera are sequentially switched by a video switcher installed on the surveillance camera side, transmitted in sequence, and monitored by a video monitor. Met. However, in such a system, it is impossible to arbitrarily select and monitor a surveillance camera to be monitored from a remote value. Further, if a video signal from an arbitrary surveillance camera can be selected, there is a problem that the transmission capacity of the video signal is increased and quick monitoring cannot be performed.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to construct a surveillance camera system capable of arbitrarily selecting and monitoring a video signal from a surveillance camera installed in a remote place. Aim.

[0004]

SUMMARY OF THE INVENTION In a remote monitoring system for transmitting video signals from a plurality of surveillance cameras via a public line or the like and monitoring the video signals on a video monitor installed at a location distant from the surveillance cameras, the remote monitoring system responds to the video signals. A code attaching section for attaching a camera code representing a surveillance camera, a video signal switching section for switching a video signal with a camera code every predetermined period, and a monitor for outputting a video signal for display on a video monitor from each switched video signal. A camera selection unit for specifying a camera, a video signal selection unit for selecting a video signal provided with a camera code corresponding to a selection signal from the camera selection unit, and a frame memory for temporarily storing the selected video signal. A video signal arbitrarily selected by the camera selection unit can be displayed on a video monitor and monitored.

A plurality of the frame memories are provided, and a frame memory selecting section for selecting a video signal stored in the frame memory and displaying the selected video signal on a video monitor is provided, and an arbitrary video signal stored in the frame memory is switched and displayed on the video monitor. And monitor it.

[0006] The frame memory is a DRAM or an SRA.
It is composed of a semiconductor disk made of M or the like, a magnetic disk device such as an HDD, a magneto-optical disk device such as an MO or other digital storage devices.

[0007] The selection signal of the surveillance camera is transmitted from the video monitor to the surveillance camera, a predetermined video signal is selected by the video signal selection unit installed on the surveillance camera, and transmitted through the public line or the like. Configuration.

The video signal transmitted through the public line or the like is an output signal of the video signal switching unit, and the video signal selection unit is provided on the video monitor side.

The predetermined period is three fields of a video signal.

The camera selection section is provided with a self-propelled selection function for selecting surveillance cameras in a predetermined circular order.

[0011] The camera selection section is provided with a programmable function of selecting surveillance cameras in a predetermined order.

The camera code is composed of a plurality of horizontal scanning lines representing one bit at a predetermined level of one horizontal scanning line in a vertical blanking period of the video signal, and the one horizontal scanning period is repeated a plurality of times. The camera code is detected by sampling in duplicate.

The output of the video signal switching section is also used as a VCR input signal for performing continuous recording.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic block diagram of a main part of (A) a surveillance camera side (B) and a video monitor side of one embodiment of a remote monitoring system according to the present invention. The video signals from the plurality of monitoring cameras 1a, 1b,.
The data is transmitted via the public communication line L1 and the like, and the surveillance camera 1a,
1b,... Is monitored by a video monitor 11 installed at a location distant from. The video signals output from the surveillance cameras 1a, 1b,... Are provided with camera codes representing the respective surveillance cameras at the code attaching sections 2a, 2b,. Cord attaching part 2
A video signal provided with a camera code in a, 2b,... is input to the video signal switching unit 3, and the video signal is switched in a circular order at predetermined intervals of, for example, three fields. The switched video signal is input to the transmission unit 4 and subjected to processing such as band compression and time axis expansion to form a transmission path signal, which is transmitted from the public communication line L1 such as INS64 to the video monitor. On the video monitor side, the transmission path signal transmitted by the receiving unit 6 is received, and the original video signal is restored. The camera code separation unit 7 separates the camera code from the received video signal and monitors the camera code at an input port of the MPU 9 or the like. On the other hand, on the video monitor side, video monitor 1
1, a camera selection input unit 10 including a keyboard or the like serving as a camera selection unit for specifying a surveillance camera that outputs a video signal to be displayed. If the received video signal has a camera code corresponding to the surveillance camera input from the camera selection input unit 10 that matches the camera code of the received video signal, this is transmitted to the field under the control of the MPU 9 serving as the video signal selection unit. Write to memory 8 and output it to PDP
And the like on the video monitor 11. By providing a plurality of the frame memories 8 and providing a frame memory selection unit for selecting video signals stored in the plurality of frame memories and displaying the selected video signals on a video monitor (not shown),
For example, a plurality of videos having different time stamps can be sequentially displayed so that the detailed time lapse of the object can be monitored. In this case, the frame memory is DRA
A semiconductor disk made of M, SRAM, or the like, a magnetic disk device such as an HDD, a magneto-optical disk device such as an MO, or another digital storage device can be used.

In FIG. 1, the video signal selecting section is provided on the video monitor side. However, the present invention is not limited to this, and may be provided on the surveillance camera side. In this case, the selection signal from the camera selection input unit 10 is transmitted to the public communication line L1.
The video signal of the surveillance camera selected by the code separation unit, the MPU, the field memory and the like installed on the surveillance camera side is transmitted from the public communication line L1 to the video monitor side. On the video monitor side, the original video signal is restored and displayed on the video monitor. In this embodiment, only the video signal for the selected predetermined period needs to be transmitted, and the amount of transmitted information can be reduced. In the embodiment of FIG. 1, the selection signal from the camera selection input unit 10 does not need to be transmitted to the surveillance camera, and the configuration is simplified.

The period during which the video signal is switched by the video signal switching unit 3 is, for example, three fields of the video signal as described above. By doing so, the first one field can be used as a camera code detection field, and the surveillance video of one frame can be obtained with the video signals of the latter two fields, so that a simple and efficient configuration can be realized. Become.

The camera selection unit is provided with a switching table 12 such as a ROM, for example, separately from the camera selection input unit 10 including a keyboard and the like, and outputs camera codes in the order written in the switching table 12. , A selection signal for selecting surveillance cameras in a predetermined circular order is generated. Then, video signals from the respective monitoring cameras can be sequentially displayed and monitored. Alternatively, the switching table 12 is provided as a RAM so that the switching table can be input from the camera selection input unit 10 including a keyboard or the like so that the switching table can be set in advance, and a programmable function capable of selecting a monitoring camera in an arbitrary order is provided. By doing so, monitoring can be performed in an optimal order according to the setting status of the monitoring camera and the like.

The camera code representing the surveillance camera is, for example, 11 in the vertical retrace period of the video signal from each surveillance camera.
Put on 5H from H to 16H. 1 for each horizontal scan line
The signal is expressed as a logical 1 or 0 at a white level or a black level over one horizontal scanning line, and 5H gives a 5-bit camera code. In this case, 32 surveillance cameras can be identified. When the camera code is separated by the camera code separation unit 7, one horizontal scanning period is sampled a plurality of times, for example, three times, and sampling is performed three times. . The output of the video signal switching unit 3 is divided into VCRs for continuous recording.
It is economical to input the number 5 and use it as a VCR input signal for logging for a long time.

[0019]

In a remote monitoring system for transmitting video signals from a plurality of surveillance cameras via a public line or the like and monitoring the video signals with a video monitor installed at a location remote from the surveillance cameras, the surveillance cameras corresponding to the video signals are represented. A code attaching section for attaching a camera code, a video signal switching section for switching a video signal with a camera code every predetermined period, and a surveillance camera for outputting a video signal to be displayed on a video monitor from each of the switched video signals. A camera selection unit, a video signal selection unit for selecting a video signal provided with a camera code corresponding to the selection signal from the camera selection unit, and a frame memory for temporarily storing the selected video signal. By adopting a configuration in which the video signal arbitrarily selected can be displayed and monitored on the video monitor, Surveillance camera system that can monitor arbitrarily selected image signal is can be constructed easily.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a main part of (A) a surveillance camera side (B) and a video monitor side of one embodiment of a remote monitoring system according to the present invention.

[Explanation of symbols]

 1a, 1b surveillance camera 2a, 2b code attaching section 3 video signal switching section 4 transmission section 5 VCR 6 receiving section 7 camera code separation section 8 field memory 9 MPU 10 camera selection input section 11 video monitor 12 switching table L1 public communication line

Claims (10)

[Claims] 1. A surveillance camera corresponding to a video signal in a remote surveillance system for transmitting video signals from a plurality of surveillance cameras via a public line or the like and monitoring the image with a video monitor installed at a location remote from the surveillance camera. Designate a code attaching section for attaching a camera code, a video signal switching section for switching a video signal with a camera code every predetermined period, and a monitoring camera for outputting a video signal for display to a video monitor from each switched video signal. A camera selection unit, a video signal selection unit that selects a video signal attached with a camera code corresponding to the selection signal from the camera selection unit, and a frame memory that temporarily stores the selected video signal,
A remote monitoring system characterized in that a video signal arbitrarily selected by a camera selection unit can be displayed on a video monitor and monitored. 2. A video monitor, comprising: a plurality of frame memories, a frame memory selecting section for selecting a video signal stored in the frame memory and displaying the selected video signal on a video monitor, and switching an arbitrary video signal stored in the frame memory. 2. The remote monitoring system according to claim 1, wherein the remote monitoring system is configured to be displayed and monitored. 3. The frame memory is a DRAM or an SR.
3. A magnetic disk device such as an HDD, a magneto-optical disk device such as an MO, and other digital storage devices.
The remote monitoring system as described. 4. The surveillance camera selection signal is transmitted from the video monitor side to the surveillance camera side, a predetermined video signal is selected by the video signal selection unit installed on the surveillance camera side, and the video signal is transmitted to the public line or the like. 2. The remote monitoring system according to claim 1, wherein the remote monitoring system is configured to transmit. 5. The video signal transmitted through the public line or the like,
2. The remote monitoring system according to claim 1, wherein said video signal switching unit is an output signal, and said video signal selecting unit is provided on a video monitor side. 6. The remote monitoring system according to claim 1, wherein the predetermined period is three fields of a video signal. 7. The remote monitoring system according to claim 1, wherein the camera selection unit is provided with a self-propelled selection function for selecting a monitoring camera in a predetermined circular order. 8. The remote monitoring system according to claim 1, wherein the camera selection unit has a programmable function of selecting a monitoring camera in a predetermined order. 9. The camera code includes a plurality of horizontal scanning lines representing one bit at a predetermined level of one horizontal scanning line in a vertical blanking period of the video signal. 2. The remote monitoring system according to claim 1, wherein the camera code is detected by sampling a plurality of times in duplicate. 10. The remote monitoring system according to claim 1, wherein an output of said video signal switching unit is also used as a VCR input signal for performing continuous recording.