JPH08149455A - Security system - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a crime prevention system that can reliably detect abnormalities in a short time. [Structure] The security system 1 includes a detection sensor 3, a monitoring camera 5, and a processing device 7. The detection sensor 3 is composed of a pyroelectric infrared sensor unit. The detection signal from the detection sensor 3 is supplied to the digital input terminal of the processing device 7 via the cable 31. The surveillance camera 5
An image of a predetermined monitoring area is formed on the element of the CCD unit 52 by the optical lens 51. The CCD unit 52 converts the image formed on the element into a predetermined video signal and supplies it to the analog input terminal of the CPU 71 of the processing device 7. When the detection sensor 3 detects that something has entered the predetermined monitoring area, the CPU 71 immediately operates the monitoring camera 5 to acquire a plurality of image information, and the image information before the abnormality detection, The image information immediately after the abnormality is detected is compared, the intruder determination process is performed, and the result is output from the output terminal 75.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crime prevention system for monitoring an intruder in a surveillance area, and in particular, there is an intruder in the surveillance area when an image is acquired by a surveillance camera at regular intervals. The present invention relates to a crime prevention system that immediately acquires a plurality of images when they are detected by a detection sensor and compares and determines these images to determine whether there is an abnormality.

[0002]

2. Description of the Related Art As a conventional security system of this type,
There is proposed a method of determining a moving direction and a moving route of an intruded object by taking a predetermined monitoring area with a monitoring camera at regular intervals, for example, and comparing and determining images before and after the predetermined area (special feature JP-A-62-136987, JP-A-62-136988). According to this crime prevention system, it is possible to determine the moving direction and the moving route based on the image information obtained at regular time intervals.

As another crime prevention system, a detection sensor monitors a predetermined monitoring area, and if an abnormality is detected by this detection sensor, the power of the surveillance camera is turned on (Japanese Patent Laid-Open No. Hei 4-139989). Gazette), a monitoring camera captures a predetermined monitoring area at regular intervals, and when an anomaly is detected by a detection sensor, the images before and after the anomaly detection are compared to determine the presence or absence of the anomaly ( JP-A-2-
182093) has been proposed.

According to the above-mentioned other crime prevention system, since the surveillance camera is not operated when there is no intrusion, there is no power consumption, no error is detected, and only when an abnormality such as intrusion occurs, before and after the abnormality is detected. Since the abnormality is determined based on the image, the abnormality determination is more reliable than the case where the abnormality determination is always performed based on the image.

[0005]

According to the former crime prevention system, since the moving direction and the moving route are determined based on the image information obtained at regular time intervals, the amount of information is enormous. Although it takes time, the conflicting requirements that high-speed processing is required must be satisfied, a processing apparatus that requires high processing capacity is required, and a very expensive system is inevitable.

Further, according to the latter security system, in the case of turning on the power of the surveillance camera when the detection sensor detects an abnormality, the labor cost of the surveillance staff is increased and the determination becomes ambiguous. In addition, in the case of making an abnormality determination based on the image information before and after the abnormality, there is a disadvantage that the abnormality cannot be immediately determined because the image is captured in a fixed time.

An object of the present invention is to solve the above-mentioned drawbacks of the conventional device and to provide a crime prevention system capable of surely detecting an abnormality in a short time.

[0008]

In order to achieve the above object, a crime prevention system according to the invention of claim 1 has a detection sensor for detecting an object that has entered a predetermined monitoring area, and the predetermined monitoring area. A monitoring camera for imaging and image information from the monitoring camera are acquired at regular intervals, and when a detection signal from the detection sensor is input, the monitoring camera immediately acquires a plurality of screens for comparison and An image processing device capable of performing a determination process and outputting a determination result.

In order to achieve the above object, a security system according to a second aspect of the present invention includes a detection sensor for detecting an object that has entered a predetermined monitoring area, and a surveillance camera for picking up an image of the predetermined monitoring area. Image information from the surveillance camera is acquired at regular time intervals, and when a detection signal from the detection sensor is input, a plurality of screens are immediately acquired by the surveillance camera to perform a comparison / judgment process, and a determination is made. An image processing device capable of outputting a result, and an output device for notifying a processing result from the image processing device are provided.

According to a third aspect of the present invention, there is provided a detection sensor, which is an element capable of detecting a difference between emission energy due to a background temperature and emission energy due to a human body or the like. The detection sensor according to claim 4 is a pyroelectric infrared sensor.

The surveillance camera according to claim 5 is a charge-coupled device camera. Claim 6
The described output device is an image display device that displays an image of the determination result. Claim 7
The output device described is characterized by being an acoustic output device that acoustically notifies the determination result.

[0012]

In the invention according to claim 1 configured as described above, a predetermined monitoring area is normally monitored by the detection sensor, and the monitoring camera images the predetermined monitoring area at regular intervals. . Then, when the detection sensor detects that something has entered the predetermined monitoring area, the processing device operates the monitoring camera to immediately acquire a plurality of image information. As a result, the processing device compares the initial image information with the image information other than the initial image and performs the determination process. The processing device can output this determination processing result.

According to the second aspect of the invention configured as described above, the output device operates in the same manner as the first aspect of the invention, and the result determined by the processing device can be output by the output device. Since the detection sensor according to the third aspect is an element capable of detecting the difference between the emission energy due to the background temperature and the emission energy due to the human body or the like, the detection signal is output only when there is energy different from the background of the predetermined monitoring area.

Since the detection sensor according to the fourth aspect is a pyroelectric infrared sensor, it is possible to detect a difference in infrared energy in a certain monitoring area. Since the surveillance camera according to the fifth aspect is a charge-coupled device camera, it is possible to obtain an image of a predetermined surveillance region with low power consumption. In the output device according to the sixth aspect, since the determination result is displayed as an image on the image display device, the notification result can be surely recognized. Claim 7
Since the described output device acoustically notifies the determination result by the acoustic output device, it is possible to reliably notify the determination of abnormality.

[0015]

The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a block diagram showing an embodiment of a crime prevention system according to the present invention. Security system 1 shown in FIG.
Is roughly provided with a detection sensor 3, a monitoring camera 5, and a processing device 7, and is configured as follows.

The detection sensor 3 is composed of a pyroelectric infrared sensor unit. The output terminal of the detection sensor 3 is connected to the digital input terminal of the processing device 7 via the cable 31. As a result, this detection sensor 3
Is capable of detecting an intrusion into a predetermined area and applying a detection signal to the digital input terminal of the processing device 7 via the cable 31.

The surveillance camera 5 comprises an optical lens 51 and a charge coupled device (CCD) unit 52. In this surveillance camera 5, an image of a predetermined surveillance area is taken by the optical lens 51.
Thus, an image is formed on the element of the CCD unit 52. The CCD unit 52 is also capable of converting the image formed on the element into a predetermined video signal. The output terminal of the CCD unit 52 is the cable 5
3 is connected to the analog input terminal of the processing device 7. The monitoring camera 5 is configured in this way, and an image in a predetermined area is converted into a video signal and supplied to the analog input terminal of the processing device 7 via the cable 53 so that the predetermined area can be monitored. There is.

The processing unit 7 is a central processing unit (CP).
U) 71, ROM (ROM) 72, RAM (RAM) 7
3 and a power supply device 74. The CPU 71 has an analog input terminal and a digital input / output terminal,
As described above, the analog signal from the surveillance camera 5 and the abnormality detection signal from the detection sensor 3 can be taken in. The CPU 71 includes an analog / digital (AD) converter that converts an analog input signal input to the analog input terminal into a digital signal. Also, CP
The U71 can process the digital signal input to the digital input terminal, and can output the processed result as a digital signal via the output terminal 75. The CPU 71 is connected to the ROM 72 and the RAM 73, can execute predetermined processing by a processing program stored in the ROM 72, and stores necessary information and the like in the RAM 73. Further, the processing device 7 is provided with a power supply device 74,
This power supply device 74 is adapted to convert the AC power supplied from the AC input terminal 76 into a DC power, stabilize it, and then supply it to the CPU 71, and power the other device through the terminal 77 if necessary. Is available.

An output device 9 is connected to the output terminal 75. The output device 9 may be an image display device such as a display, an acoustic output device such as a buzzer, or a combination of these devices. The image display device is a device that can display the determination result as an image, and may be configured by a CRT display or the like as described above. The sound output device is a device that notifies the determination result by sound, and may be configured by, for example, a buzzer or a speaker that reproduces a specific sound signal.

The detection sensor 3 and the monitoring camera 5 are
Uses an integrated one.

2 and 3 are views showing specific examples of the detection sensor 3 and the surveillance camera 5 used in this embodiment.

In these figures, the detection sensor 3 and the surveillance camera 5 are integrated, and are arranged in a space surrounded by a transparent cover 42 which is detachable from the base 41. The detection sensor 3 includes a sensor unit 44 provided on a substrate 43 and a sensor unit 44 provided on the substrate 43.
And a processing circuit 45 provided around the. The sensor unit 44 includes a transparent cover 47 having a Fresnel lens 46.
A base portion 48 to which the cover 47 is attached, and a pyroelectric sensor 49 fixed to the base portion 48 and arranged at the focal position of the Fresnel lens 46. Also, the processing circuit 4
Reference numeral 5 processes the detection signal from the pyroelectric sensor 49 to obtain a difference in infrared energy, and when the difference occurs, a warning signal can be output.

The surveillance camera 5 comprises an image pickup unit 55 provided on the substrate 43, and a processing circuit 56 provided on the substrate 43 and around the image pickup unit 55. The image pickup unit 55 includes a CCD unit 52 and an optical lens 51 provided in front of the CCD unit 52. The processing circuit 56 can take out the signal from the CCD unit 52 and output it as a video signal.

The operation of the embodiment thus configured is shown in FIG.
-Based on FIG. 3, it demonstrates with reference to FIG. 4 and FIG. FIG.
3 is a flow chart for explaining the operation of the embodiment. FIG. 5 is an explanatory diagram showing an example of an image pickup screen for explaining the operation of the embodiment. FIG.
FIG. 5 (2) shows the screen after the alarm is issued, and FIG. 5 (3) shows the screen obtained by taking the difference between the both screens.

In these figures, the above-mentioned security system 1
When the power is turned on, power is supplied from the power supply device 74 of the processing device 7 to each unit, and each unit starts operating. Further, the detection sensor 3 constantly monitors a predetermined monitoring area, and the monitoring camera 5 also images the same monitoring area.

Here, the CPU 71 of the processing device 7 determines whether or not there is an alarm from the detection sensor 3 (step 201 in FIG. 4). If there is no intruder or the like, there is no notification signal from the detection sensor 3, so the CPU 71 determines that there is no notification (step 201; NO), and determines whether a certain time has elapsed (step 202). Then, the CPU 71 determines that the fixed time has not elapsed (step 202; N).
O), and again it is determined whether or not there is an alarm from the detection sensor 3 (step 201). In this way, the detection sensor 3 constantly monitors a predetermined area.

In such a state (step 2
01 to step 202), when the CPU 71 determines that a certain time has passed (step 202; YES), the CP
U71 obtains the screen of the area from the surveillance camera 5 (step 203). The CPU 71 stores this screen in the RAM 73. Then, the detection sensor 3 again monitors a predetermined area (step 201 to step 2).
02). By executing such processing, the CPU
71 is acquired from the surveillance camera 5 one screen at a time.

As described above, while the detection sensor 3 constantly monitors a predetermined area (steps 201 to 202), one screen is acquired from the monitoring camera 5 at regular intervals (steps 201 to 201). Step 203),
When the CPU 71 receives the alarm signal from the detection sensor 3 (step 201; YES), the CPU 71 immediately operates the surveillance camera 5 and acquires a plurality of screens in a short time (step 204). The CPU 71 then displays an initial screen 300 (see FIG. 5A) which is the first screen immediately before or after the alarm is issued by the detection sensor 3, and a screen 310 shown in FIG. (Excluding the first screen when the first screen after reporting is used) is compared (step 205).

Here, the initial screen 300 shown in FIG.
A person 510 at a predetermined distance L1 from the door 500.
a is photographed, and a person 510b at a distance L2 (moving state) from the door 500 is photographed on the screen 310 shown in FIG. 5 (2).

Therefore, the CPU 71 causes the screen 30
Taking the difference of 0 and 310, as shown in FIG.
In the screen 320, the background of the door 500 and the like disappears, and the inflated person 510c remains. That is, for the person 510c, an increment (+ Δ) and a decrement (−Δ) are formed. As a result, the CPU 71 can determine that an abnormality has occurred (step 205; YES), and output an abnormality report to the output terminal 75 (step 206).

On the other hand, when the detection sensor 3 issues a warning due to popcorn noise or rapid temperature change, the CPU
71 causes the surveillance camera 5 to operate immediately, and the surveillance camera 5
From multiple screens in a short time (step 20)
4). In this case, the CPU 71 does not display the initial screen 300 of the detection sensor 3 (the screen of FIG. 5A, which is the screen before the report is issued or the first screen captured after the report is issued) and the first screen acquired after the report is issued. A plurality of screens 310 (the same screen as FIG. 5A) is compared (step 205). Then
When the CPU 71 obtains the difference between the screens 300 and 310 (step 205), the screen 320 shows the background of the door 500, the wall, the person (in this case, the person 510a is the mannequin) and the person (the mannequin). All of them disappear, and the CPU 71 determines that there is no intruder (step 205; NO), and enters the monitoring routine of the detection sensor 3 again (steps 201 to 203).

As described above, in this embodiment, the detection sensor 3
However, even if a false alarm is issued due to, for example, popcorn noise or a rapid temperature change, the surveillance camera 5 immediately after the alarm is issued.
Since several screens are acquired and compared with each other, it can be immediately judged as an erroneous report, and the defect of the detection sensor 3 and the defect of the surveillance camera 5 can be eliminated.

Further, in this embodiment, the good sensitivity of the detection sensor 3 can be used as a trigger for data collection of the surveillance camera 5.

Furthermore, in the present embodiment, even if there is a defect of the detection sensor 3, that is, there is an alarm due to popcorn noise or a sudden temperature change, several screens are acquired immediately after the alarm is issued and compared with the screen before the alarm is issued. Therefore, these changes do not appear in the image, and reliable monitoring is possible.

In addition, in the present embodiment, the flicker and vibration of light also affect the screen of the surveillance camera 5, but since the detection sensor 3 does not operate depending on this, judgment processing is performed so that no alarm is issued after all. Will be done.

Further, in this embodiment, since the detection sensor 3 and the surveillance camera 5 are used together, the intruder's algorithm, such as the intruder's route and size, which cannot be known by the detection sensor 3, is detailed. You can catch and accurately determine that you are an intruder.

Further, in this embodiment, the problem of the CCD monitoring camera can be solved by using the passive sensor.

Further, in the present embodiment, since the judgment processing is carried out by the machine, there is little possibility of false alarm.

Further, in this embodiment, the detection sensor 3 constantly monitors and sensitively catches the change of the environment, and the monitoring camera 5
Since the image processing from the above is only required to be synchronized with the detection sensor 3, the processing device 7 does not have to be processed and the power consumption may be small.

[0040]

As described above, according to the first aspect of the present invention, when the detection sensor detects that something has entered the predetermined monitoring area, the processing device immediately causes the monitoring camera to operate. , Multiple image information is acquired, initial image information is compared with other image information, and intruder judgment processing is performed, so there is no false alarm and only image processing is performed when necessary, so power saving it can.

In the invention according to claim 2, the invention according to claim 1
In addition to the described invention, the result determined by the processing device can be output by the output device, so that there is no false alarm, and it is possible to reliably notify when there is an intruder, etc. Power consumption can be saved because only processing is performed.

According to the third aspect of the invention, since the detection sensor is an element capable of detecting the difference between the emission energy due to the background temperature and the emission energy due to the human body or the like, it is possible to reliably monitor the predetermined monitoring area.

According to the fourth aspect of the invention, since the detection sensor is a pyroelectric infrared sensor, it is possible to reliably detect infrared energy in a predetermined monitoring area.

According to the fifth aspect of the invention, since the surveillance camera is the charge-coupled device camera, it is possible to obtain an image with low power consumption.

According to the sixth aspect of the invention, since the determination result can be displayed on the image display device as an image, the route, direction, etc. of the intruder can be surely grasped.

According to the seventh aspect of the invention, since the determination result can be notified by sound by the sound output device, it is possible to reliably notify the abnormality.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a crime prevention system according to the present invention.

FIG. 2 is a front view showing a specific example of a detection sensor and a surveillance camera used in the embodiment.

FIG. 3 is a side view showing a specific example of a detection sensor and a surveillance camera used in the embodiment.

FIG. 4 is a flowchart for explaining the operation of the embodiment.

FIG. 5 is an explanatory diagram for explaining the operation of the embodiment.

[Explanation of symbols]

 1 Security System 3 Detection Sensor 5 Surveillance Camera 7 Processing Device 9 Output Device 31 Cable 41 Base 42 Transparent Cover 51 Optical Lens 52 CCD Unit 53 Imaging Unit

Claims (7)

[Claims] 1. A detection sensor that detects an object that has entered a predetermined monitoring area, a monitoring camera that captures an image of the predetermined monitoring area, and image information from the monitoring camera that is acquired at regular intervals. When a detection signal from the detection sensor is input, an image processing device capable of immediately acquiring a plurality of screens by the monitoring camera, performing comparison / judgment processing, and outputting a judgment result is provided. Security system. 2. A detection sensor that detects an object that has entered a predetermined monitoring area, a monitoring camera that captures an image of the predetermined monitoring area, and image information from the monitoring camera that is acquired at regular intervals. When a detection signal from a detection sensor is input, an image processing apparatus that immediately acquires a plurality of screens by the monitoring camera, performs comparison / judgment processing, and outputs a judgment result, and a processing result from the image processing apparatus A crime prevention system characterized by comprising an output device for giving notification. 3. The crime prevention system according to claim 1, wherein the detection sensor is an element capable of detecting a difference between energy emitted by a background temperature and energy emitted by a human body. 4. The security system according to claim 3, wherein the detection sensor is a pyroelectric infrared sensor. 5. The security system according to claim 1, wherein the surveillance camera is a charge-coupled device camera. 6. The image display device, wherein the output device is an image display device that displays an image of the determination result.
The described crime prevention system. 7. The crime prevention system according to claim 2, wherein the output device is a sound output device that notifies the determination result by sound.