JPS63269298A - Abnormality detector - Google Patents

Abstract

PURPOSE:To smoothly perform patrol service by controlling whether or not an abnormality occurrence decision signal according to the number of times of the detection output of a person intrusion detection sensor by a device which outputs the abnormality occurrence decision signal according to the output image variation of a TV camera. CONSTITUTION:The image pickup signal of the TV camera to be an object to be monitored is processed by an image processor 3 and a controller 4 decides abnormality according to a change of the output image and generates the abnormality occurrence signal. This controller 4, on the other hand, is applied with detection signals from sensors 2a and 2b for intrusion detection and the output of the abnormality occurrence decision signal from the controller 4 is stopped when the number of times of detection reaches a specific value. A patrolling person, therefore, need not turns off the controller 4 manually every time he or she enters an object area and the patrol service is performed smoothly.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an abnormality detection device, and is particularly suitable for monitoring the intrusion of personnel into restricted areas and controlling plants, etc. in conjunction with the monitoring results. The present invention relates to a suitable abnormality detection device.

[Conventional technology]

Demand for automation of equipment monitoring is increasing due to demands for labor savings in thermal power plants. For this reason, a method of centrally monitoring important equipment (eg, fuel supply system, burner section, main pulp, etc.) on a monitor television using a surveillance television camera has become widely used.

Furthermore, in recent years, there has been an increasing trend in cases in which images from television cameras are processed and used to determine the presence or absence of abnormalities, as a result of the spread from the FA field.

FIG. 4 is a configuration diagram showing the configuration of a conventional abnormality detection device.

A television camera 1 photographs a field of view 7 at a predetermined angle with respect to the surveillance area, and the image information obtained from this 1st shadow is input to an image processing device 3, which changes the brightness and shape of the image. etc., determines the presence or absence of an abnormality based on the magnitude relationship with a preset reference amount of change, and outputs the result.

In such a configuration, for example, if a valve whose abnormal operation would cause abnormal operation of the plant is disposed within the field of view 7 of the television camera, if a patrolman enters the field of view 7, he will be seen from the television camera 1. The brightness and shape of the output image information change significantly. When this change exceeds the reference change amount, it is determined that there is an abnormality, and an abnormality presence/absence determination signal S is output.

For example, when a patrolman is wearing white clothing, when the patrolman enters the field of view 7, the area of the white part in the binarized image increases, and when the change in the area of the white part exceeds the set value, It is determined that there is an abnormality. Based on this determination result, an alarm is generated or the determination is controlled.

[Problem that the invention seeks to solve]

The above-mentioned abnormality detection device has a problem with full automation because it uniquely determines that there is an abnormality if there is a change in brightness, shape, etc. in the image information of the camera that exceeds the level of change.

For example, when a patrol officer enters an area monitored by a television camera, it is necessary to take measures such as manually taking the anomaly detection device offline (preventing it from outputting an anomaly determination result), and It became necessary to install a manual operation panel, which hindered automation. In addition, the monitoring area is the area where the main equipment of the plant is installed, and from the perspective of equipment maintenance, there is a high degree of human access, and as mentioned above, it is not possible to manually take the equipment offline and bring it online. The problem with automation was that it made patrol work more complicated.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to automatically go offline and online when people such as patrollers leave the monitoring area, so that patrol work etc. can be carried out smoothly. An object of the present invention is to provide an anomaly detection device that provides the following characteristics.

[Means for solving problems]

In order to achieve the above object, the present invention provides an abnormality detection device that determines an abnormality in a monitoring area based on a change in an output image of a television camera that photographs an object to be monitored, and outputs an abnormality presence/absence determination signal. The present invention is characterized by being provided with an intrusion detection sensor that detects the entry of a person into a monitoring area, and a control means that controls whether or not the abnormality determination signal can be output based on the number of detection outputs by the sensor. .

[Effect]

A sensor whose intrusion detection area is on the side of the camera field of view detects the intrusion and departure of a person from the field of view. The number of times this detection output occurs is used to determine whether a patrolman or the like passes through or stays in the monitoring area, and it is determined whether or not the abnormality presence/absence determination signal obtained by the image processing device can be output based on the content of the determination. Therefore, the passage of a patrolman or the like is automatically detected, and there is no need for the patrolman to manually take the abnormality determination signal offline.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram showing a first embodiment of the present invention. The area adjacent to the field of view 7 of the television camera 1 is defined as an intrusion detection area 8a.
, 8b for intrusion detection are attached to the television camera 1.

The television camera 1 is connected to the previously mentioned image processing device 3 which performs abnormality detection processing based on the image output signal, and a control device 4 is connected to this image processing device 3. In addition to the abnormality determination result signal Sj, pulse output signals from each of the intrusion detection sensors 2a and 2b are applied to the control device 4.

The control device 4 counts the pulse output signals of each of the intrusion detection sensors 2a and 2b, and determines whether or not the abnormality determination result can be sent to the output terminal 9 based on the count results.

Note that the image processing device 3 determines the presence or absence of an abnormality by averaging and capturing the image, then binarizing it, calculating the exclusive OR of this and a reference binarized image, and calculating the area ratio of the white part of this image. The monitored equipment 6 that is monitored by the television camera l that determines the presence or absence of an abnormality is, for example, a main valve. Sensors 2a and 2b are provided, and intrusion detection areas 8a and 8b are formed on both sides of the visual field 7.

Next, the operation in the above configuration will be explained.

When the patroller 5 passes through the intrusion detection area 8a formed by the infrared light beam emitted from the intrusion detection sensor 2a, the reflected light of the light beam hits the intrusion detection sensor 2a.
The light enters the light receiving section of the light receiving section, and sends out a pulse signal to the control device 4. The control device 4 counts this pulse signal as the first pulse, and stops sending the abnormality/non-determination result signal from the image processing device 3 to the abnormality determination output terminal 9 .

This state continues until the patroller 5 enters the next intrusion detection area 8b. Next, when the patroller 5 passes through the intrusion detection area 8b of the intrusion detection sensor 2b and exits the monitored area, a pulse signal is similarly sent from the light receiving part of the intrusion detection sensor 2b to the control device 4. . The control device 4 counts this pulse signal as the next pulse, resumes sending the abnormality determination result signal to the abnormality determination output terminal 9,
At the same time, set the pulse count number to O.

The above is a case where - number of patrollers 5 pass through the monitoring area, but there may be a plurality of patrollers. In this case, the control device 4 adjusts so that the transmission to the terminal 9 is interrupted at the first pulse (-th pulse) and the transmission is resumed at the fourth pulse (fourth pulse). Furthermore, since the movement behavior of patrollers is not necessarily uniform, for example, if there is only one patroller, the next (second) pulse cannot be received even after a certain period of time (for example, 60 seconds) has passed after receiving the first pulse. The control device 4 automatically restarts the delivery when
By adjusting this, it becomes possible to detect abnormalities, such as when a patrolman encounters an accident and becomes unable to move after entering the monitoring area.

FIG. 2 is a flowchart showing an example in which each of the processes described above is executed by a microcomputer provided in the control device 4.

First, the first pulse is sent to the intrusion detection sensor 2a or 2.
(Step 1)).

Upon generation of this pulse, it is determined that the patroller 5 has entered the monitoring area (range of the field of view 7), and the sending of the presence/absence determination signal S1 to the terminal 9 is stopped. (Step 12
).

Next, it is determined (step 13) whether a certain period of time (for example, 60 seconds) has elapsed since the first pulse was received. This second pulse, which is used to determine whether it has been received (step 14), is generated when the intruding patrolman 5 passes by, or when he returns after intruding.

When it is determined in step 14 that the second pulse has been received,
It is assumed that Patrolman 5 has escaped from the surveillance area.
Sending of the presence/absence determination signal SJ to the terminal 9 is permitted. (
Step 15) and set the pulse counter to O (
Step 16). After this, the process returns to step 1) and the subsequent processes are executed again.

On the other hand, even if the WAIT time elapses in step 13, 2
If the second pulse is not received, it is assumed that the monitoring area is stopped for accident processing, recovery work, etc.
Sends abnormality determination signal SJ to terminal 9 (step 1
5).

According to the above embodiment, since the previous generation intrusion detection sensor is used, there is no risk of energization unlike the pressure type intrusion detection sensor installed on the floor, and the response speed is fast, so it is suitable for intrusion detection. The distance between the sensor and the television camera can be shortened (approximately 1 m), which has the advantage of preventing interference with the abnormality determination function when working near the area monitored by the television camera.

FIG. 3 shows another embodiment of the present invention, in which intrusion detection sensors 2a and 2b are attached to both sides of the television camera 1 (or to a member movable together with the television camera 1), and these are mounted on a rail for moving the television camera. 10 so that it can be moved.

With such a configuration, the television camera l can be moved according to the monitoring area, so the monitoring area can be set optimally, and the freshness of abnormality determination can be improved.

In each of the above embodiments, the previous generation sensor was used as the intrusion detection sensor, but an ultrasonic sensor may also be used. By doing so, the intrusion detection area can be made wider compared to the previous generation, and the margin of installation height of the intrusion detection sensor can be increased. In addition, the sensor
In addition, various types such as a pressure type and a hot wire type can be used.

〔Effect of the invention〕

As described above, according to the present invention, the intrusion of a patrolman or the like into the monitoring area is detected in advance and no abnormality determination signal is output, so that the reliability of abnormality detection can be improved, and the patrol This eliminates the need for manual abnormality detection offline operations by personnel or the like.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a flowchart showing a processing example of the present invention, FIG. 3 is a perspective view showing another embodiment of the present invention, and FIG. 4 is a conventional FIG. 2 is a configuration diagram showing the configuration of an abnormality detection device. 1...TV camera, 2a, 2b...
Intrusion detection sensor, 3... Image processing device, 4.
·····Control device. Agent: Patent attorney Masaru Nishimoto - Figure 1

Claims (3)

[Claims] (1) In an abnormality detection device that determines an abnormality within a monitoring area based on changes in the output image of a television camera that photographs the object to be monitored and outputs an abnormality presence/absence signal, the entry of a person into the monitoring area is detected. An abnormality detection device comprising: an intrusion detection sensor; and a control means for controlling whether or not the abnormality determination signal can be output based on the number of detection outputs by the sensor. (2) The abnormality detection device according to claim (1), wherein the sensor is disposed such that each of the opposite ends of the pedestrian passageway in the monitoring area is set as an intrusion detection area. (3) The television camera and the sensor are integrated and movably installed.
The abnormality detection device described in section 1).