JP2000209573A - Intruder detecting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To build up an intruder detection system which high precision by utilizing an infrared sensor and a picture sensor employing an image pickup device (supervisory camera). SOLUTION: A picture sensor 2 receives a video signal from an image pickup device 1, calculates the difference between a background picture and a current picture or the difference between a picture of a preceding frame and the current picture so as to detect the change in the lightness, intrusion or a movement of a person or the like, and an infrared sensor 3 senses the person. A discrimination section 4 receives a signal from the picture sensor and a signal from the infrared sensor 3 via a control section 6 so as to discriminate whether only a change in the lightness or the like by the intrusion or the movement of the person and a notice section 5 reports the detected contents based on the discrimination. Or a monitor 7 for displaying a supervised picture may display the contents.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intruder detection system, and more particularly to a system for detecting an intruder (object) by using an image sensor by a monitoring camera and an infrared sensor in combination.

[0002]

2. Description of the Related Art There are two types of detection of an intruder in a monitoring area: a type using a pyroelectric infrared sensor, and a type detecting an intruder by processing an image obtained from an imaging device (monitoring camera). However, when using an infrared sensor, an intruder (object) that cannot be detected unless it has heat like a human
It is difficult to determine the size of the intruder, it is difficult to detect if the intruder is far away, etc.
Although the above-mentioned drawbacks of the infrared sensor can be overcome, there is a problem that a change in the brightness of the screen due to turning on / off of the lighting is mistakenly attributed to the intrusion of a person (object).

[0003]

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to construct a highly accurate intruder detection system by using an infrared sensor and an image sensor by an image pickup device together.

[0004]

In order to achieve the above object, an intruder detection system according to the present invention comprises an infrared sensor for detecting a person, a change in brightness based on a video signal from an imaging device, the presence or absence of a person, and An image sensor for detecting movement and the like;
A notifying unit for notifying the presence of an intruder is provided, the intruder is detected based on the signal from the infrared sensor and the signal from the image sensor, and the notification unit notifies the presence of the intruder.

When a change is detected in substantially the entire area of the screen by the image sensor and no detection signal is output from the infrared sensor, it is assumed that the brightness of the monitoring area has changed, and the brightness is changed by the notification unit. You may be notified that it has done. In this case, monitoring of an intruder or the like continues.

In addition, when a detection signal is not output from the infrared sensor and a change is detected in the image sensor in an area larger than a reference area for determining an intruder or the like, a notification unit notifies the presence of the intruder. To do it.

[0007] When a detection signal is output from the infrared sensor, the notification unit notifies that the intruder has approached the imaging device regardless of whether or not a change has been detected by the image sensor.

Further, a monitor for displaying an image or the like based on a video signal from the imaging device may be provided, and the detected content may be displayed on the monitor based on a signal from the infrared sensor or the image sensor.

Alternatively, based on a signal from an infrared sensor or an image sensor, the content of the detection may be transmitted to an external alarm device or the like via a required transmission path and notified.

Further, a warning device is attached to the imaging device,
An intruder or the like may be warned based on a signal from an infrared sensor or an image sensor. The warning device is a lighting lamp, a buzzer, a loudspeaker, or the like, and performs lighting of the lighting lamp, sounding of a buzzer, or outputting a warning sound by a loudspeaker.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. FIG. 1 is a block diagram of a main part of an embodiment of an intruder detection system according to the present invention. In FIG. 1, reference numeral 1 denotes an imaging device (surveillance camera) that captures an image of a monitoring area and outputs a video signal, and 2 denotes a change in brightness of the monitoring area, the presence or absence of a person (object) or movement based on a signal from the imaging apparatus 1. An image sensor 3 for detecting an infrared sensor for detecting a person, and a reference numeral 4 for judging the presence or absence of a change in brightness, the presence or absence of a person (object), and the presence or absence of movement based on a signal from the image sensor 2. A discriminating unit for discriminating the intrusion of a person or the like based on the signal, a notifying unit for notifying the intrusion of a person or the like based on a signal from the discriminating unit, and a control for controlling the image sensor 2, the discriminating unit and the notifying unit Reference numeral 7 denotes a monitor that displays a monitoring image based on a video signal from the imaging device 1.

Next, the operation of the intruder detection system according to the present invention will be described. The imaging device 1 is installed facing the monitoring area, performs imaging, outputs a video signal, and inputs the video signal to the image sensor 2. In the image sensor 2, for example, first, an image of a frame preceding the image capturing apparatus 1 is stored in a built-in background image memory, read out, and a current image sequentially input from the image capturing apparatus 1 is used for screen display. Brightness difference (average value) in almost all areas of
Is calculated, and this is compared with a threshold value of a determination criterion for a change in brightness, and when it is larger than the threshold value, a change in brightness is detected,
Second, the background image (or the image of the previous frame) when there is no intruder (object) from the imaging device 1 is stored in the background image memory, read out, and the current image input from the imaging device 1 is read. Is calculated for each corresponding pixel. Thirdly, the brightness difference between the corresponding pixels is calculated between the image of the previous frame stored and read out in the background image memory and the current image, and the calculated value is the brightness difference. The number of pixels that are larger than the threshold for the presence criterion is counted, and the number is compared with the threshold for the motion criterion. These detection signals from the image sensor 2 are input to the determination unit 4 via the control unit 6. On the other hand, the infrared sensor 3 is configured by, for example, a pyroelectric infrared sensor or the like, detects far infrared rays radiated by a person, and inputs the far infrared rays to the determination unit 4 via the control unit 6.

In the discriminating section 4, when the image sensor 2 detects a change in brightness and nothing is detected by the infrared sensor 3 (see FIG. 2), the intrusion of a person is caused only by the change in the brightness of the monitoring area. It is determined that the brightness is not the same, the notification unit 5 notifies that the brightness has changed, and monitoring of an intruder or the like continues. Also, if an intruder is detected by the image sensor 2 (same as above) even if it is not detected by the infrared sensor 3, it is determined that a person or the like has entered, and the notification unit 5 notifies that the person has entered, When the movement of a person or the like is detected by the image sensor 2 (the same), the notification unit 5 notifies that the person is moving. When a person is detected by the infrared sensor 3,
Regardless of the content of the detection by the image sensor 2 (same as above,
)), It is determined that a person has entered, and the notifying unit 5 notifies that the person has entered. If the infrared sensor 3 detects a person and the image sensor 2 does not detect anything (same), the intruder Is determined to be approaching the imaging device 1, and the notification unit 5 notifies that a person is approaching the imaging device 1. In addition, in the above-described determination by the determination unit 4, the monitor 7 displaying the monitoring image from the imaging device 1 in the normal state.
May be transmitted to display the detected content.

Further, the content detected by the infrared sensor 3 or the image sensor 2 is transmitted to a required signal transmission means, for example, RS
LAN (Local) via 232C, RS485, RS422, IEEE1394, etc.
AreaNetwork), telephone line, wireless, etc., alarm device,
Transmit to a personal computer or an external device such as a dedicated control device,
You may make it notify a monitoring member etc. In addition, a warning device such as a lighting lamp, a buzzer, or a loudspeaker is attached to the imaging device 1 to turn on the lighting lamp or sound a buzzer to warn the intruder, or use a loudspeaker to voice the intruder. May be warned to leave immediately.

[0015]

As described above, according to the intruder detection system according to the present invention, an image sensor using an imaging device (surveillance camera) and an infrared sensor are used in combination to detect intrusion and movement of a person. Therefore, the accuracy of detecting an intruder is improved, false alarms are drastically reduced, and a high-performance system can be constructed.

[Brief description of the drawings]

FIG. 1 is a main block diagram of an embodiment of an intruder detection system according to the present invention.

FIG. 2 is a diagram showing the relationship between detection of an image sensor and an infrared sensor and notification contents.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 imaging device 2 image sensor 3 infrared sensor 4 determination unit 5 notification unit 6 control unit 7 monitor

Claims (9)

[Claims] 1. An infrared sensor for detecting a person, an image sensor for detecting a change in brightness, the presence or absence or movement of a person based on a video signal from an imaging device, and a notifying unit for notifying the presence of an intruder. An intruder detection system provided for detecting an intruder or the like based on a signal from an infrared sensor and a signal from an image sensor, and notifying the presence or the like of the intruder by a notification unit. 2. When a change is detected in substantially the entire area of the screen by the image sensor and no detection signal is output from the infrared sensor, the brightness of the monitoring area is assumed to have changed, and the brightness is notified by the notification unit. 2. The intruder detection system according to claim 1, wherein the intrusion detection system notifies the intruder of the change. 3. When a change is detected in substantially the entire area of the screen by the image sensor and no detection signal is output from the infrared sensor, it is assumed that only the brightness of the monitoring area has changed, 2. The intruder detection system according to claim 1, wherein monitoring of the intruder is continued. 4. A detection signal is not output from the infrared sensor, and if a change is detected in the image sensor in a region larger than a reference area for determining an intruder or the like, the intruder is notified by the notification unit. 2. The intruder detection system according to claim 1, wherein the presence is notified. 5. When the detection signal is output from the infrared sensor, the notification unit notifies that the intruder has approached the imaging device regardless of whether or not a change has been detected by the image sensor. The intruder detection system according to claim 1. 6. A monitor according to claim 1, further comprising a monitor for displaying an image or the like based on a video signal from said imaging device, and displaying a detected content on the monitor based on a signal from said infrared sensor or image sensor. An intruder detection system according to any of the above. 7. The apparatus according to claim 1, wherein the content of the detection is transmitted to an external alarm device or the like via a required transmission path based on a signal from the infrared sensor or the image sensor, and is notified. Intruder detection system. 8. The intruder detection system according to claim 1, wherein a warning device is attached to the image pickup device to warn an intruder or the like based on a signal from the infrared sensor or the image sensor. . 9. The intruder detection system according to claim 8, wherein the warning device is a lighting lamp, a buzzer, a loudspeaker, or the like, and performs lighting of a lighting lamp, sounding of a buzzer, or outputting a warning sound by a loudspeaker. .