JP3266394B2 - Security monitoring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a security monitor for monitoring an intruder by switching images captured by a plurality of monitoring cameras and selectively displaying the images on a monitor.

[0002]

2. Description of the Related Art As multiple security surveillance device for selectively displaying on the monitor side by switching the images taken by surveillance cameras, for example, surveillance cameras 1 ₁ 7
Respectively for each 1 _n through the coaxial cable 2 ₁ to 2 _n and sends the analog video signal to the switching device 3, the switching device 3
There is known a method of selectively displaying an image on the monitor 4 by switching the image on the monitor 4. In addition, instead of sending an analog video signal, a digital sending method or a digitally compressed sending method has been proposed.

[0003] However, in such a way, the coaxial cable 2 ₁ to 2 _n to the monitoring camera 1 ₁ each to 1 _n is required, since an expensive method using only one coaxial cable in recent years Proposed. For example, JP-A-4-6
In the device disclosed in Japanese Patent No. 8676, a plurality of monitoring devices and a controller are connected via a loop-type transmission line. The monitoring device always stores a digital image while rewriting a frame memory, and detects an error when a difference between frames is detected. The detection signal is sent out on the loop transmission path. When the controller detects this abnormality detection signal, it sends an image transfer request to the monitoring device, and the monitoring device transfers the still image stored in the frame memory to the controller. ing.

In an apparatus disclosed in Japanese Patent Application Laid-Open No. 4-95486, for example, a control signal superimposing section on the monitor side and a plurality of switching control sections on the camera side are connected to one coaxial cable, and analog video signals and DC signals are connected. The camera is switched by the step voltage by superimposing the step voltage.

[0005]

When operating such a monitoring system, it is very burdensome for the observer to always look at the monitor screen.
In the conventional apparatus shown in FIG. 7 and Japanese Patent Application Laid-Open No. Hei 4-95486, intruders are displayed simply by automatically switching each video taken by a plurality of surveillance cameras at a constant speed and selectively displaying them. There is a problem that a case may occur where an intruder cannot be found by overlooking an existing monitoring screen.

In the conventional apparatus disclosed in Japanese Patent Application Laid-Open No. 4-68676, for example, the monitoring apparatus only detects abnormalities digitally and transfers a past still image.
The current image cannot be displayed, and it is not possible to confirm where the intruder is currently moving after detecting the abnormality. Therefore, monitoring cannot be performed efficiently even though a plurality of cameras are used.

Further, the method of transmitting a video image digitally has a problem that a digital image processing circuit is required and the whole system becomes expensive. It is desirable to transfer by signal. In view of such a conventional problem, the present invention provides an inexpensive configuration for monitoring an intruder by switching images captured by a plurality of monitoring cameras and selectively displaying the images on a monitor side. It is an object of the present invention to provide a security monitoring device that allows an intruder to reliably monitor an intruder.

[0008]

In order to achieve this object, the present invention detects a plurality of surveillance cameras for photographing each surveillance area and detects an intruder in each surveillance area photographed by the plurality of surveillance cameras. A plurality of security sensors, a central controller having a monitor for switching and selectively displaying images captured by the plurality of surveillance cameras, and a plurality of security cameras connected to the plurality of security cameras and the security sensors, respectively. A plurality of repeaters for frequency-multiplexing an analog video signal and an alarm signal when the security sensor detects an intruder and transmitting the multiplexed signal to a central controller via one transmission line, wherein the central controller transmits a polling signal. A plurality of repeaters are called one after another by sending them out to the transmission line, and each repeater calls the surveillance camera when calling itself. In addition to transmitting the analog video signal to the central controller in a time division manner, the central controller interrupts the polling and continuously calls the repeater when receiving the alarm signal during the polling, and the called repeater is The video taken by the surveillance camera is continuously transmitted, and the plurality of repeaters respectively
A memory for storing the video of the surveillance camera;
If the security sensor detects an intruder, the memory
Freeze the stored video and press the central control
Memory switching signal when called by the
Is the video being shot by the surveillance camera
Switch to the image frozen in the memory
The data is sent to the central controller .

[0009]

[0010] The present invention is also characterized in that the central controller, when displaying an image on the monitor when the security sensor detects an intruder, also displays that the image is in an abnormal state. In the present invention, the central controller further includes designation means for selectively calling the repeater manually in the manual switching mode, and continuously sends a call signal to the repeater designated by the designation means; The called repeater continuously switches the images of the plurality of monitoring cameras by continuously transmitting the images captured by the monitoring cameras.

The present invention is also characterized in that the central controller has a variable polling period in the automatic switching mode. The invention also provides that the central controller comprises:
It is characterized by having a means for displaying the camera number of the repeater that has transmitted the alarm signal. The present invention is also characterized in that the central controller has a buzzer that sounds when the alarm signal is received.

The present invention also provides a video tape recorder (VT) when the central controller receives an alarm signal.
R) means for starting recording.

[0013]

According to the present invention, the analog video signal and the control signal are frequency-multiplexed and transmitted, and the analog video signal of each camera is transmitted in a time-division manner by polling.
The image of the camera in the monitoring area where the intruder is detected is fixedly displayed on the monitor of the central controller. Therefore,
It is possible to automatically switch images shot by a plurality of surveillance cameras to prevent a monitoring screen selectively displayed on the monitor from being overlooked, and to transmit an analog image signal through a single transmission path. And can be transmitted at low cost.

In addition, when a time lag until switching to the image of the camera in the monitoring area where the intruder is detected, or when the image of the intruder cannot be transmitted because the image of another camera is being transmitted, Since the video is stored in the memory and transmitted to the central controller when a memory switching signal from the central controller is received, the video captured by the plurality of monitoring cameras is switched by polling and selectively displayed on the monitor side. In this case, it is possible to prevent a video in which an intruder is detected from being overlooked.

After confirming the image stored in the memory, the repeater can be selectively called by manual operation in the manual switching mode, and the current photographed image can be displayed.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.
I do. FIG. 1 shows an embodiment of a security monitoring device according to the present invention.
FIG. 7 is a configuration diagram showing the same components as those shown in FIG.
Have the same reference numerals. In FIG. 1, a surveillance camera 1
₁~ 1_nAre repeaters 1 as shown in detail in FIG.
0₁-10_nAnd the repeater 10₁~ 1
0_nEach has a security sensor 11₁~ 11_nBut
It is connected. Security sensor 11 ₁~ 11_nIs
For example, detecting infrared energy emitted from the human body
Thus, a pyroelectric sensor that detects an intruder is used.
These surveillance cameras 1₁~ 1_nAnd the repeater 10₁~
10_nAnd security sensor 11₁~ 11_nIs the watchdog
It is located at each appropriate monitoring location in the area.

The repeaters 10 ₁ to 10 _n are connected to a central controller 20 as shown in detail in FIGS.
An analog video signal and a control signal are frequency-multiplexed and transmitted on a transmission path by the coaxial cable 2 via the coaxial cable 2 and cameras ₁₁ to 1 _{n as described later.} Are transmitted in a time-division manner by polling. The control signal, the polling signal containing the address of the repeater 10 ₁ to 10 _n from the central controller 20 is transmitted, an alarm signal including the own address is transmitted from the repeater 10 ₁ to 10 _n.

Next, the configuration of the repeater 10 will be described in detail with reference to FIG. The camera 1 (1 ₁ to 1 _n ) constantly captures an image of the monitoring area, and this analog video signal is transmitted via the switching unit 11a, the switch 11b and the transmission circuit 12 to a frequency band as shown in FIG. (A band of 4.5 MHz or less) to the coaxial cable 2. The control unit 13 controls the switching unit 11a to select an image from the camera 1 or the memory 16, and controls the switch 11b to turn on and off the video signal from the switching unit 11a.

As shown in FIG. 3, a control signal such as a polling signal or an alarm signal is transmitted to the coaxial cable 2 at a frequency of, for example, 40 MHz.
Transmitted between In this transmission, when an alarm signal is transmitted from the repeater 10 to the central controller 20 to the pair, the alarm signal from the control unit 13 is modulated by the transmission circuit 12 and transmitted to the coaxial cable 2, and transmitted from the central controller 20 to the relay. The polling signal for the device 10 is
The signal is demodulated by the transmission circuit 12 and taken into the control unit 13.

The address setting section 14 can set its own address (ID information), and the address identifies the polling signal addressed to itself. Control unit 1
3 also includes a security sensor 11 (11 ₁₎ shown in FIG.
To 11 _n) are connected, an alarm signal including the own address is sent from the control unit 13 intruder by the security sensor 11 is detected for the coaxial cable 2.

An analog video signal captured by the camera 1 is A / D converted by an A / D converter 15 and the latest image of a predetermined number of frames is stored in a memory 16. The image data stored in the memory 16 is read out under the control of the control unit 13 having received the control signal from the central controller 20, is D / A converted by the D / A converter 17, and is switched by the switching unit 11a and the switch. 11b
Is transmitted to the coaxial cable 2 via the transmission circuit 12.

Next, the configuration of the central controller 20 will be described in detail with reference to FIGS. The analog video signal transmitted via the coaxial cable 2 is input to the monitor 21 and the VTR 22, and the monitor 21 displays the input video,
The VTR 22 starts recording the input video under the control of the control unit 23. In addition, the central controller 20 sends each repeater 1
The polling signal for "0" is generated by the control unit 23, is modulated into a band by the transmission unit 24 as shown in FIG. 3, is transmitted to the coaxial cable 2, and is output from each repeater 10 on the coaxial cable 2 to the central controller 20. The signal is demodulated by the transmission unit 24 and taken into the control unit 23.

The central controller 20 also has a camera display 25 for displaying the number of the camera 1 selected as a display other than the monitor 21 for displaying images.
Alarm display unit 26 and the security sensor 11 ₁ to display the number of the camera 1 that sent the alarm signal
An alert / cancel display unit 29 for displaying the alert / cancel state of 11 _n is provided, and a buzzer 27 for sounding when an alarm signal is received is provided. As shown in FIG. 5 as an example, the camera display unit 25 LED25a seven segment system is used, the alarm display unit 26 is provided in the camera ₁ 1 each to 1 _n LED2
6a.

The operation unit 28 includes a numeric keypad 28a for inputting a camera number, a security sensor number, and a warning / release state, and a send button 28b for sequentially specifying camera numbers in a manual switching mode.
A stop / cancel button 28c for stopping the polling mode and shifting to the manual switching mode, or canceling the manual switching mode and returning to the polling mode, and a return button 28d for specifying the camera number in the reverse order. And a power switch 28e, and the like, and the control unit 23 performs control as described later when the operation unit 28 is operated.

Next, the operation of the above embodiment will be described. Destination
During normal automatic switching monitoring (polling mode)
Is the central controller 20,₁-10_nTo
Each polling signal to call (call command and repeater 1
0₁-10_nIncluding the address. ) In a predetermined cycle
It is sent out on the coaxial cable 2. In contrast, the repeater 10
₁-10_nEach control unit 13 controls the switching unit 11a
La 1₁~ 1_nSide, and the polling signal
Switch 11 only when it identifies its own address in the
b is turned on for a predetermined time.

[0026] Thus, each image being captured by the camera 1 ₁ to 1 _n is sent on sequential coaxial cable 2 above polling period are sequentially selectively displayed on the central controller 20 side of the monitor 21. Switching unit 11
Since a is switched to 1 ₁ to 1 _n-side camera, even if image captured by the camera 1 ₁ to 1 _n is not rewritten in the memory 16 of each repeater 10 within _one to 10 _n, the video It is not transmitted on the coaxial cable 2.

In such automatic switching monitoring,
For example, when the security sensor 11 _k detects an intruder, the repeater 10 _k that detects the intruder freezes the video stored in the memory 16 and sends an alarm signal including its own address regardless of the polling signal addressed to itself. I do. When the central controller 20 detects this alarm signal, the corresponding LED 26 of the alarm display section 26
a is turned on, the buzzer 26 is sounded, the polling is interrupted, a signal for calling only the repeater 10 _k that has sent this alarm signal is sent, and the VTR 22 is sent.
Turn on.

[0028] Then, upon receiving the call signal of the detected transponder 10 _k addressed thereto in an intruder sends the image captured by the camera 1 _k. The observer monitors the current state of the monitoring area photographed by the camera 1 _{k on} the monitor 21 of the central controller 20. However, the security sensor 11 _k detects the intruder and then detects the intruder. Since there is a time lag before switching to the screen of the monitoring area, the intruder may pass through the monitoring area.
A memory switch signal is transmitted to 0 _k .

Upon receiving this memory switching signal, the repeater 10
_k switches the switching unit 11a to the memory 16 side and turns on the switch 11b, and sends out the frozen video to the memory 16. Also, when you want to switch to camera 1 _k of images, by transmitting the camera switching signal to the repeater 10 _k, the repeater 10 _k has a switching section 11a in the camera 1 _k side receives this camera switching signal Will switch.

[0030] Therefore, when the automatic switching monitoring security sensor 11 ₁ to 11 _n for detecting an intruder, the central controller 20 side of the monitor 21 is fixed to the screen of the monitoring area detected intruders The video because There is recorded by VTR22, can be displayed by fixing the screen of the monitoring area detected an intruder even if each image being captured by the camera 1 ₁ to 1 _n automatically switched by polling, Therefore, operation efficiency can be improved.

Further, while monitoring the image from the camera 1 _k by calling the repeater 10 _k detecting the intruder, another security sensor, for example, the security sensor 11
_{When 1} detects an intruder, the repeater 10 that detects the intruder
_{In step 1} , the video stored in the memory 16 is frozen, and an alarm signal including its own address is sent to the central controller 20.

When the central controller 20 detects this alarm signal, the corresponding LE of the alarm display section 26 is displayed.
D26a is turned on. If you want to switch from later observer in this state to the image from the camera 1 ₁ repeater 10 ₁ which sent the alarm signal, by inputting the number of the camera 1 ₁ by numeric keys 28a, the central controller 2
0 transmits a call signal to the relay 10 _1. The repeater 10 _1, by receiving this call signal,
And sends the image captured by the camera 1 _1.

The monitor is the monitor 2 of the central controller 20.
1, but the monitoring of the current status of the captured monitoring area by the camera 1 _1, the security sensor 11 ₁
Since there is a time lag between the detection of the intruder and the switching to the screen of the monitoring area where the intruder is detected, the intruder may pass through the monitoring area. operation to transmit the memory switching signal to the repeater 10 _1.

Upon receiving this memory switching signal, the repeater 10
₁ switches the switching unit 11a to the memory 16 side, turns on the switch 11b, and sends out the frozen video to the memory 16. Thus security sensor 11 ₁ to 11 _n detects the intruder, immediately the image of the monitoring area may be stored in the memory 16, is sent to the image from the memory 16 by the switching signal from the central controller 20, the monitor Since the image can be displayed on the display 21, it is possible to prevent a video in which an intruder is detected from being overlooked.

The LED 2 of the alarm display section 26
6a, the buzzer 26 sounds, and when an image of the detected intruder is displayed on the monitor 21, the image indicating that the image is in an abnormal state is displayed together. A quick transition to the switching mode allows the intruder to be switched to the camera that is currently shooting.

That is, when monitoring automatic switching, the central
The camera 1 is connected via the numeric keypad 28a on the roller 20 side.₁~
1_nNumber is manually selected, the central control
The control unit 23 on the roller 20 side is selected by the ten key 28a.
Repeater 10 corresponding to the assigned number_k(K = 1, 2,... N)
And send only the signal that calls
The camera number is displayed on the camera display unit 25. Also stop
Similarly, when the release button 28c is operated,
Camera 1 during polling, ie receiving video _kCompatible with
Repeater 10_k(K = 1, 2,... N)
Is sent continuously.

[0037] Therefore, only the repeater 10 _k which has received the call signal addressed to itself is turned on to continue the switch 11b, the other relay device 10 does not turn on the switch 11b, it is selected in the central controller 20 side Only the image from the camera _1k is continuously displayed on the monitor 21. When the feed button 27a is operated during the manual switching monitoring, the currently selected camera 1 is turned off.
_k of only the signal for calling a repeater 10 k _{+ 1} corresponding to the next camera 1 _{k + 1} is transmitted from the central controller 20 on the coaxial cable 2, therefore, the repeater receives a call signal addressed to itself 10 k ₊ only ₁ turns on continuously switch 11b, the camera 1 _{k + 1} only video from is sent onto the coaxial cable 2 central controller 20 side of the monitor 2
1 is continuously displayed. Also, the send button 28a
Each time is operated, the number for calling the camera 1 is incremented, and the screen on the monitor 21 is changed to the next camera ₁₁ to 1 _n
Switch to

Similarly, when the return button 28d is operated during the manual switching monitoring, only a signal for calling the repeater 10 _k-1 corresponding to the camera 1 _k-1 in front of the currently selected camera 1 _k is provided. Is transmitted, only the image from the camera 1 _k-1 is displayed on the monitor 21 of the central controller 20, and every time the return button 28d is operated, the monitor 2
Screen on the 1 is switched to the front of the camera _{1 1 ~1 n.}

[0039] When the stop-release button 28c during the manual switching monitoring is operated, the manual switching mode is canceled, the polling resumes its automatic switching monitoring mode, the image from the camera 1 ₁ to 1 _n Automatically switches on the monitor 21. Incidentally, since the switched video by polling in this embodiment, the one relay 10 _k as shown in FIG. 1, a pair of surveillance cameras 1
_{In addition to k} and the security sensor 11 _k , another monitoring camera 1 _k ′ and the security sensor 11 _k ′ can be connected via a separately provided repeater 10 _k ′ and a coaxial cable 2 ′.

[0040] In the above embodiment, use was made of a pyroelectric sensor as the security sensor 11 ₁ to 11 _n, to detect an intruder by the motion and luminance variation between a plurality of frames stored instead in the memory 16 It may be. Further, a change in luminance on the monitor 21 side of the central controller 20 may be used. Further, in the above embodiment, the case where the video switching speed is variable only at the time of manual switching monitoring has been described. However, the polling period at the time of automatic switching monitoring as in the polling signals P1 to Pn and the video signals I1 to In shown in FIG. T0, T1, and T2 may be varied stepwise by operating a switch. In this case, for example, when the screen of the monitor 21 is fixed when an intruder is detected, the monitor checks the fixed screen, returns to the automatic switching monitoring mode, and speeds up or slows down the polling cycle. The entire area can be monitored closely.

[0041]

As described above, the present invention provides a plurality of surveillance cameras for photographing each surveillance area, and a plurality of security sensors for detecting intruders in each surveillance area photographed by the plurality of surveillance cameras. A central controller having a monitor for switching and selectively displaying images captured by a plurality of surveillance cameras, and being connected to the plurality of surveillance cameras and the security sensor, respectively, to provide analog video signals of the surveillance cameras and the security. A plurality of repeaters for multiplexing an alarm signal when the sensor detects an intruder and transmitting the multiplexed signal to the central controller via one transmission line, wherein the central controller transmits a polling signal to the transmission line; Call multiple repeaters in sequence, and each repeater transmits the analog video signal of the surveillance camera at the time of calling itself. While transmitting to the central controller by division, when the central controller receives an alarm signal during polling, it interrupts polling and continuously calls the repeater, and the called repeater is photographed by the surveillance camera. Video from the surveillance camera
The security sensor.
When an entry is detected, the video stored in the memory is
Freezes and is being called by the central controller
To the surveillance camera when the
Video frozen from memory
Switch to image and send to central controller
Since, quilt both in be constructed inexpensively since it can be transmitted via a single transmission line of the analog video signal
Automatically captures images captured by multiple surveillance cameras.
Even when switching and selectively displaying on the monitor side,
It is possible to prevent overlooking the image that detected the intruder
it can.

[0042]

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a security monitoring device according to the present invention.

FIG. 2 is a block diagram showing the repeater of FIG. 1 in detail;

FIG. 3 is an explanatory diagram showing frequencies of a video signal and a control signal.

FIG. 4 is a block diagram showing the central controller of FIG. 1 in detail.

FIG. 5 is an external view showing the central controller of FIGS. 1 and 5;

FIG. 6 is an explanatory diagram showing a variable polling cycle.

FIG. 7 is a configuration diagram showing a conventional security monitoring device.

[Explanation of symbols]

1, 1 ₁ to 1 _n: surveillance camera 2: coaxial cable 11, 11 ₁ to 11 _n: security sensors 20, 20 ₁ to 20 _n: repeater 11a: selector switch 11b: switch 12: transmission circuit 13: control unit 14 : Address setting unit 15: A / D conversion unit 16: Memory 17: D / A conversion unit 20: Central controller 21: Monitor 22: VTR 23: Control unit 24: Transmission path 25: Camera display unit 25 a: LCD 26: Alarm Display units 26a, 29a: LED 27: Buzzer 28: Operation unit 28a: Numeric keypad 28b: Feed button 28c: Stop / Release button 28d: Return button 28e: Power switch 29: Warning / release display unit

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Ishida 2-10-43 Kami-Osaki, Shinagawa-ku, Tokyo Inside Houtiki Co., Ltd. (72) Inventor Junichi Tabata 2- 10-43, Kami-Osaki, Shinagawa-ku, Tokyo Inside Hochiki Co., Ltd. (72) Inventor Michihiro Yonezawa 2-10-43 Kamiosaki, Shinagawa-ku, Tokyo Inside Houchiki Co., Ltd. (72) Shinji Kobayashi 2- 10-43 Kamiosaki, Shinagawa-ku, Tokyo Hochiki (56) References JP-A-3-96097 (JP, A) JP-A-1-197898 (JP, A) JP-A-2-132599 (JP, A) JP-A-63-278198 (JP, A) A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G08B 13/00-15/02 G08B 23/00-31/00 H04N 7/18

Claims (7)

(57) [Claims] 1. A plurality of surveillance cameras for photographing each surveillance area, a plurality of security sensors for respectively detecting intruders in each surveillance area photographed by the plurality of surveillance cameras, and an image photographed by the plurality of surveillance cameras A central controller having a monitor for switching and selectively displaying the displayed video, and being connected to the plurality of surveillance cameras and security sensors, respectively, wherein an analog video signal of the surveillance cameras and the security sensor detect an intruder. And a plurality of repeaters for frequency-multiplexing the alarm signal in the case where the alarm signal is transmitted to the central controller via one transmission path, wherein the central controller transmits a polling signal to the transmission path to transmit the plurality of alarm signals. Call the repeaters sequentially,
Each repeater transmits the analog video signal of the surveillance camera to the central controller in a time-sharing manner at the time of calling itself, and the central controller interrupts polling when receiving the alarm signal during polling and stops the relay. And the called repeater continuously sends out the video taken by the surveillance camera , and the plurality of repeaters respectively transmit the video of the surveillance camera.
It has a memory to store, and the security sensor concerned invaded
When a person is detected, the video stored in the memory is flashed.
To be called by the central controller.
When the memory switch signal is received when the
Freezes the memory from the video taken by La
A security monitoring device, wherein the security monitoring device switches to a selected video and sends it to the central controller . 2. The security monitoring device according to claim 1 , wherein the central controller displays an image of an abnormal state together with an image when a security sensor detects an intruder on a monitor. Security monitoring device characterized by the following. 3. In a security monitoring device according to any one of claims 1 to 2, wherein the central controller includes a designation means for selectively invoking the repeater manually in the manual switching mode, The calling signal is continuously transmitted to the repeater designated by the designation means, and the called repeater continuously transmits the video imaged by the surveillance camera, whereby the plurality of surveillance cameras are A security surveillance device characterized by manually switching images. 4. In a security monitoring device according to claim 1 to 3, wherein the central controller is a security surveillance and wherein the polling period is a variable in the automatic switching mode. 5. In a security monitoring device according to any one of claims 1 to 4, wherein the central controller includes a feature in that it comprises means for displaying a camera number of repeaters that sent the alarm signal Security monitoring device. 6. In a security monitoring device according to any one of claims 1 to 5, wherein the central controller, a security monitoring and having a buzzer for sounding when receiving the alarm signal apparatus. 7. In a security monitoring device according to any one of claims 1 to 6, wherein the central controller, upon receiving the alarm signal, having means for initiating the recording of the video tape recorder A security monitoring device characterized by the following.