JP6807247B2 - Monitoring system and monitoring method - Google Patents

Description

The present invention relates to a technique for monitoring a monitoring area using a camera.

Patent Document 1 describes a technique for displaying a monitoring target included in an image of a camera after processing it so that it is easy to understand in a system for monitoring a predetermined place using a camera. Specifically, in the technique of Patent Document 1, when the monitored person exists in the monitored area, the number of moving objects departing from the monitored area is counted in association with the monitored person, and the counted number is the threshold value. When the number exceeds, a mark for identifying the monitored person is displayed.

JP-A-2015-09695

Surveillance cameras are usually installed higher than the human eye. Since the imaging range and imaging direction of the surveillance camera are different from the field of view of the observer, when the observer or the like visually observes the image of the surveillance camera, it may not be possible to easily recognize where in the real space the image was captured. For this reason, it may be difficult for the observer who deals with the abnormality to grasp the relationship between the imaging range of the surveillance camera and his / her position.
Therefore, an object of the present invention is to enable a person who deals with an abnormality to easily grasp his / her position on the image when confirming the image of the monitoring area.

In order to solve the above-mentioned problems, the monitoring system of the present invention captures an image captured by a camera device installed in a monitoring area and a past image which is an image previously captured by the camera device. Based on the storage unit to be stored, the first position specifying unit for specifying the current position of the person to deal with the abnormality generated in the monitoring area, and the specified current position, the person is placed on the stored past image. It includes a first generation unit that generates a first image in which the current position is clearly specified, and a first output unit that outputs the first image.

In the monitoring system of the present invention, the first generation unit generates the first image in which the current position of the personnel is clearly shown on the past image including at least the image at the time of abnormality captured when the abnormality occurs. May be good.
In the monitoring system of the present invention, the first position specifying unit may acquire the position information of the mobile terminal possessed by the corresponding person and specify the current position of the person on the image based on the position information. ..
In the monitoring system of the present invention, the first position specifying unit may identify the person to be dealt with based on the image analysis of the acquired image, and may specify the current position of the person on the image.

In the monitoring system of the present invention, the second position specifying unit that specifies the abnormal position, which is the position where the abnormality occurs in the monitoring area, and the acquired current monitoring area based on the specified abnormal position A second generation unit that generates a second image in which the abnormal position is clearly shown on the captured current image and a second output unit that outputs the second image may be provided.

In the monitoring system of the present invention, the first generation unit may generate the first image when the current degree of congestion in the imaging range of the camera device satisfies a predetermined condition.

The monitoring method of the present invention includes a step of acquiring an image captured by a camera device installed in the monitoring area, a step of storing a past image which is an image captured in the past by the camera device, and a step of storing the past image in the monitoring area. A step of specifying the current position of a person to deal with an abnormality that has occurred, and a step of generating a first image in which the current position of the person is clearly shown on the stored past image based on the specified current position. It includes a step of outputting the first image.

According to the present invention, when a person dealing with an abnormality confirms an image obtained by capturing an image of a monitoring area, he / she can easily grasp his / her position on the image.

The figure which shows the whole structure of the monitoring system which concerns on one Embodiment of this invention. The figure which shows an example of the structure of the server apparatus which concerns on the same embodiment. The figure which shows an example of the structure of the camera apparatus which concerns on the same embodiment. The figure which shows an example of the structure of the mobile terminal which concerns on the same embodiment. A sequence chart showing processing when an abnormality occurs, which is executed by the monitoring system according to the same embodiment. A sequence chart showing processing related to display of past images executed by the monitoring system according to the same embodiment. The explanatory view of the process which concerns on the display of the past image which concerns on the same embodiment. A sequence chart showing processing related to display of the current image executed by the monitoring system according to the same embodiment. The explanatory view of the process which concerns on the display of the present image which concerns on the same embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing an overall configuration of a monitoring system 1 according to an embodiment of the present invention. The monitoring system 1 is a system for monitoring the venue of an event such as a marathon competition. The monitoring system 1 includes a server device 10, a plurality of camera devices 20, a plurality of mobile terminals 30, and an operation terminal 40. The server device 10 is an information processing device that communicates with each of the plurality of camera devices 20 and the plurality of mobile terminals 30 via the communication line NW2. The communication line NW2 is, for example, a public communication line including the Internet and a wireless communication network. The server device 10 communicates with the operation terminal 40 via the communication line NW1. The communication line NW1 is a communication line including a LAN (Local Area Network). The server device 10 and the operation terminal 40 are arranged in a monitoring center for monitoring the venue of the event.
The communication lines NW1 and NW2 may be either wired or wireless communication lines.

The server device 10 performs a process for transmitting an image captured by each of the plurality of camera devices 20 to the mobile terminal 30. The plurality of camera devices 20 are installed (fixed) at predetermined locations. The camera device 20 images the monitoring area T assigned to the own device, and transmits the captured image to the server device 10. The camera device 20 is installed in a high place such as a street light or a utility pole, and takes an image in an obliquely downward direction, for example. However, the camera device 20 may be installed in any location, and the imaging direction may be any direction.

The mobile terminal 30 is a terminal device carried by the observer U. The mobile terminal 30 is, for example, a smartphone. However, the mobile terminal 30 may be a mobile terminal having a communication function and a display function, such as a tablet computer. The mobile terminal 30 may be a wearable terminal (for example, a wristwatch type terminal) worn on a body part of the observer U. The mobile terminal 30 displays an image based on the current image captured by the camera device 20 and the past image. The current image is a current image captured by the camera device 20 and is an image of the current state of the monitoring area T. The past image is an image captured by the camera device 20 in the past and is an image of the past state of the monitoring area T.

Observer U is a person who deals with an abnormality when an abnormality occurs at the venue of the event. "Abnormal" means, in the present embodiment, an event such as a suspicious person, a suspicious object (for example, a dangerous object), and an injured person, which may hinder the progress of the event for the organizer or participants. What kind of event is recognized as abnormal may be decided in advance. Observer U is assigned to the venue of the event and monitors the location he is in charge of. The observer U has personnel in various roles, such as personnel in charge of security, personnel in charge of medical relief, and personnel involved in the operation of an event.

The operation terminal 40 is a computer device used by an operator who monitors the venue of an event from a monitoring center. The operation terminal 40 displays an image of the event venue based on the images acquired from the plurality of camera devices 20. Further, the operation terminal 40 is used for input / output of information to the server device 10.

FIG. 2 is a diagram showing an example of the configuration of the server device 10. As shown in FIG. 2, the server device 10 includes a control unit 11, a first communication unit 12, a second communication unit 13, and a storage unit 14. The control unit 11 controls each unit of the server device 10. The control unit 11 includes a processor including a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory) as arithmetic processing units. The CPU controls each unit of the server device 10 by reading the program stored in the ROM or the storage unit 14 into the RAM and executing the program. The first communication unit 12 communicates with the camera device 20 and the mobile terminal 30 via the communication line NW2. The second communication unit 13 communicates with the operation terminal 40 via the communication line NW1. The first communication unit 12 and the second communication unit 13 include, for example, a modem.

The storage unit 14 stores a program executed by the control unit 11 and a past image. Further, the storage unit 14 stores ID information for identifying the device, information indicating the installation position, and area information indicating the imaging range for each camera device 20 as information regarding the camera device 20. The information indicating the installation position and the area information indicating the imaging range are coordinate information represented by latitude and longitude, and the storage unit 14 stores the correspondence between each position on the captured image and the coordinate information in the real space. Is memorized. In addition, the storage unit 14 stores various information necessary for processing executed by the server device 10, such as information for identifying the mobile terminal 30. The storage unit 14 includes, for example, a hard disk.

The control unit 11 includes an acquisition unit 111, a recording unit 112, an abnormality detection unit 113, a selection unit 114, a first position identification unit 115, a first generation unit 116, a first output unit 117, and a second. It has a position specifying unit 118, a second generation unit 119, and a second output unit 120. Each function of the control unit 11 is realized by the cooperation of the processor and the program executed by the processor.

The acquisition unit 111 acquires an image captured by the camera device 20 by using the first communication unit 12. The recording unit 112 records the past image in the storage unit 14 based on the image acquired by the acquisition unit 111. The abnormality detection unit 113 executes "abnormality detection processing", which is a processing for detecting an abnormality that may occur in the monitoring area T. The abnormality detection unit 113 detects an abnormality by, for example, analyzing an image (past image or current image) acquired by the acquisition unit 111. A known image analysis can be used for this analysis. When the abnormality detection unit 113 detects an abnormal object (suspicious person or suspicious object) on the image, the position (abnormal position) of the abnormal object on the image (that is, the imaging range of the camera device 20 that captured the image). Is specified and stored in the storage unit 14 as abnormal information. Further, the abnormality detection unit 113 can also acquire the information input by the operator from the operation terminal 40 using the second communication unit 13 and detect the abnormality based on this information. The method of detecting the abnormality is not particularly limited. When the selection unit 114 determines that the abnormality has been detected by the abnormality detection unit 113, the selection unit 114 selects the observer U who gives an instruction to deal with the abnormality. The selection unit 114 uses the first communication unit 12 to give a coping instruction to the mobile terminal 30 of the selected observer U.

The first position specifying unit 115 specifies the position of the observer U who deals with the abnormality generated in the monitoring area T. For example, the first position specifying unit 115 acquires the position information of the mobile terminal 30 from the mobile terminal 30 possessed by the observer U by using the first communication unit 12. The position information is coordinate information obtained by using GPS (Global Positioning System) or the like and represented by latitude and longitude. Then, the first position specifying unit 115 compares the imaging range of the camera device 20 designated as the display target with the position of the observer U, and specifies the position of the observer U on the image.

The first generation unit 116 reads out the past image stored in the storage unit 14, and generates an image in which the position of the specified observer U is clearly shown on the read past image. The image generated by the first generation unit 116 is an image for output and corresponds to the "first image" of the present invention. The first output unit 117 transmits the image for this output to the mobile terminal 30 of the observer U by using the first communication unit 12. Note that "transmission" is an aspect of "output".

The second position specifying unit 118 identifies the position in the monitoring area T where the abnormality has occurred. The second position specifying unit 118 identifies the position of the abnormal target in the current image acquired from the camera device 20 designated as the display target based on the abnormal information stored in the storage unit 14. The second generation unit 119 generates an image in which the position where the abnormality occurs is clearly shown on the current image based on the image acquired by the acquisition unit 111. The image generated by the second generation unit 119 is an image for output and corresponds to the "second image" of the present invention. The second output unit 120 transmits the image for this output to the mobile terminal 30 of the observer U by using the first communication unit 12.

FIG. 3 is a diagram showing an example of the configuration of the camera device 20. As shown in FIG. 3, the camera device 20 includes a control unit 21, an imaging unit 22, a storage unit 23, and a communication unit 24.
The control unit 21 controls each unit of the camera device 20. The control unit 21 has a processor including a CPU, a ROM, and a RAM as an arithmetic processing device. The CPU controls each unit of the camera device 20 by reading the program stored in the ROM or the storage unit 23 into the RAM and executing the program. The imaging unit 22 images the monitoring area T. The image pickup unit 22 includes an image pickup device and a lens exemplified by a CCD (Charge Coupled Device). The storage unit 23 stores a program executed by the control unit 21. The storage unit 23 includes, for example, a hard disk device. The communication unit 24 communicates with the server device 10 via the communication line NW2. The communication unit 24 includes, for example, a modem.

FIG. 4 is a diagram showing an example of the configuration of the mobile terminal 30. As shown in FIG. 4, the mobile terminal 30 includes a control unit 31, a display unit 32, an input unit 33, a storage unit 34, a communication unit 35, and a positioning unit 36.
The control unit 31 controls each unit of the mobile terminal 30. The control unit 31 has a processor including a CPU, a ROM, and a RAM as an arithmetic processing device. The CPU controls each unit of the mobile terminal 30 by reading the program stored in the ROM or the storage unit 34 into the RAM and executing the program. The display unit 32 displays the acquired image, the operation screen, the received information on the coping instruction, and the like on the display surface. The display unit 32 includes, for example, a liquid crystal display. The input unit 33 receives the input of information from the observer U. The input unit 33 includes, for example, a touch panel provided on the display surface of the display unit 32 and physical buttons. The storage unit 34 stores the program executed by the control unit 31. The storage unit 34 includes, for example, a flash memory. The communication unit 35 communicates via the communication line NW2. The communication unit 35 includes, for example, a wireless communication circuit and an antenna. The positioning unit 36 measures the position of the mobile terminal 30 and generates position information indicating the measured position. The positioning unit 36 includes, for example, a circuit and an antenna for positioning by GPS.
The above is the configuration of the monitoring system 1. Next, the operation of the monitoring system 1 will be described.

<Countermeasure instructions>
FIG. 5 is a sequence chart showing processing related to a coping instruction executed by the monitoring system 1.
In the camera device 20, the control unit 21 uses the image pickup unit 22 to image the monitoring area T (step S1), and transmits the current image to the server device 10 using the communication unit 24 (step S2). The camera device 20 repeats the processes of steps S1 and S2.

In the server device 10, the acquisition unit 111 acquires the current image by using the first communication unit 12 (step S3). The recording unit 112 records the past image in the storage unit 14 based on the current image acquired by the acquisition unit 111 (step S4). Next, the abnormality detection unit 113 executes the abnormality detection process (step S5). Next, the abnormality detection unit 113 determines whether or not an abnormality has occurred based on the detection result (step S6). If it is determined as "NO" in step S6, the abnormality detection unit 113 repeats the processes of steps S3 to S6.

When the abnormality detection unit 113 determines that an abnormality has occurred (step S6; YES), the selection unit 114 selects an observer U who gives an instruction to deal with the abnormality (step S7). The selection unit 114 selects, for example, the observer U at the position closest to the position where the abnormality occurs. The selection unit 114 may select the observer U based on the type of abnormality that has occurred or the role of the observer U.

When the observer U is selected, the selection unit 114 uses the first communication unit 12 to give a coping instruction to the mobile terminal 30 of the selected observer U (step S8). The coping instruction includes the coping key used for image acquisition, the position where the abnormality occurs, the content of the abnormality, and other information necessary for the observer U to deal with the abnormality. When the control unit 31 acquires the coping instruction in the mobile terminal 30, the control unit 31 notifies the observer U (step S9). As a method of notification, there is a display of the content of the coping instruction using the display unit 32, but sound output, vibration of the vibration function, or the like may be used. According to this coping instruction, the observer U deals with the abnormality that has occurred.
With the above, the coping instruction to the observer U is completed.

When the observer U is notified of the coping instruction from the mobile terminal 30, the mobile terminal 30 can display the past image and the current image as the image captured by the camera device 20. Hereinafter, the processing related to the display of each image will be described.

<Display of past images>
FIG. 6 is a sequence chart showing a process related to the display of the past image executed by the monitoring system 1.
In the mobile terminal 30, the control unit 31 requests the server device 10 to transmit the past image by using the communication unit 35 in response to the operation of the past image acquisition request by the observer U (step S11). At the time of this request, the control unit 31 transmits the position information generated by the positioning unit 36 and the information for identifying the past image. The information for identifying the past image includes, for example, information for specifying which camera device 20 the past image is to be displayed, and information for specifying when to display the captured image. In particular, since the image that the observer U wants to check is an abnormal image that is an image captured when an abnormality occurs, it is possible to specify an abnormal image, while displaying images other than the abnormal image. It is possible to specify the start date and time of imaging and the period. When an abnormal image is specified, it is treated as if a recorded image of several seconds to several tens of seconds before and after including the abnormal image is specified. A configuration may be adopted in which the observer U can select the displayed image from the list display of the past images using the mobile terminal 30.

In the server device 10, the first position specifying unit 115 specifies the position of the observer U after the request from the mobile terminal 30 (step S12). The first position specifying unit 115 identifies the position of the observer U on the past image based on the position information acquired from the mobile terminal 30. Next, the first generation unit 116 reads out the past images stored in the storage unit 14 for which transmission is requested. Then, the first generation unit 116 generates an output image in which the position of the observer U is clearly indicated on the read past image (step S13).

FIG. 7 is a diagram showing an example of the process of step S13. The figure on the left side of FIG. 7 shows the past image IM1. A suspicious object W is displayed on the past image IM1. However, even when looking at the past image IM1, the position and orientation of the current observer U in the imaging range of the camera device are unknown. Therefore, it is difficult for the observer U to grasp the positional relationship between himself and the suspicious object W. Therefore, the first generation unit 116 generates the processed image IM2 as an image for output, as shown in the figure on the right side of FIG. 7. The processed image IM2 is an image in which the position of the observer U is clearly shown on the past image IM1. Here, the mark image MI is superimposed on the position corresponding to the current position of the observer U on the past image IM1. The marker image MI is an image imitating a person here, but other images such as circles and arrows may be used as long as the position and orientation of the observer U can be recognized.

The first output unit 117 transmits an image for output to the mobile terminal 30 using the first communication unit 12 (step S14). When the control unit 31 acquires this image using the communication unit 35 in the mobile terminal 30, the control unit 31 displays the processed image on the display unit 32 (step S15). The processed image IM2 described with reference to FIG. 7 is displayed on the display unit 32.
Therefore, according to the monitoring system 1, when the observer dealing with the abnormality browses the past image of the image captured by the camera device 20 in the monitoring area T, his / her position on the displayed past image and the occurrence of the abnormality occur. You can easily grasp the relationship between your position and your position.

<Display of current image>
FIG. 8 is a sequence chart showing processing related to display of the current image executed by the monitoring system 1.
In the mobile terminal 30, the control unit 31 requests the server device 10 to transmit the current image by using the communication unit 35 in response to the operation of the current image acquisition request by the observer U (step S21). At the time of this request, the control unit 31 transmits the camera ID.

In the server device 10, the second position specifying unit 118 identifies the position where the abnormality occurs after the request from the mobile terminal 30 (step S22). The second position specifying unit 118 identifies the abnormal occurrence position on the image based on the position information indicating the abnormality occurrence position stored by the abnormality detection unit 113. Next, the second generation unit 119 generates an output image in which the abnormal occurrence position is clearly shown on the current image acquired by the acquisition unit 111 (step S23). The second generation unit 119 determines which camera device 20 to use the current image based on the camera ID from the mobile terminal 30.

FIG. 9 is a diagram showing an example of the process of step S23. The figure on the left side of FIG. 9 shows the current image IM3. This example shows the case where the suspicious object's whereabouts became unknown after the existence of the suspicious object was detected as abnormal in the past. In the current image IM3, the observer U existing in the monitoring area T is displayed. However, since the suspicious object is not displayed, it is difficult for the observer U to grasp the positional relationship between himself and the position where the suspicious object was located even when looking at the current image IM3. Therefore, the observer U does not know whether the suspicious object has been moved or whether he / she has come to the wrong place.

Therefore, the second generation unit 119 generates the processed image IM4 as an image for output as shown in the figure on the right side of FIG. The processed image IM4 is an image in which the position of a suspicious object is clearly shown on the current image IM3. Here, the mark image WI is superimposed on the position corresponding to the abnormality occurrence position on the current image IM3. The landmark image WI shows an image imitating a suspicious object in order to make it easy to understand the position of the suspicious object. However, other images such as circles and arrows may be used as long as the position of the suspicious object can be recognized. If a suspicious object still exists, that is, if an abnormality continues to occur, a display indicating the position where the abnormality has occurred may or may not be displayed.

The second output unit 120 transmits an image for output to the mobile terminal 30 using the first communication unit 12 (step S24). When the control unit 31 acquires this image using the communication unit 35 in the mobile terminal 30, the processed image is displayed on the display unit 32 (step S25). The processed image IM4 described with reference to FIG. 9 is displayed on the display unit 32.
Therefore, according to the monitoring system 1, when the observer dealing with the abnormality browses the current image of the monitoring area T captured by the camera device 20, his / her position on the current image, the position where the abnormality occurs, and his / her position The relationship with can be easily grasped.

[Modification example]
The present invention may be implemented in a form different from the above-described embodiment. Moreover, each of the modification shown below may be combined.
The higher the degree of congestion around the camera device 20, the more difficult it is to understand the status of the monitoring area T. Therefore, the first generation unit 116 clearly indicates the position of the observer U on the past image when the degree of congestion in the imaging range of the current camera device 20 satisfies a predetermined condition, and when it does not satisfy the past image. The position of the observer U may not be specified above. When the degree of congestion is the number of people present in the monitoring area T, the predetermined condition indicates that the number of the people is equal to or greater than the threshold value. The degree of congestion may be specified by analyzing the current image of the camera device 20 in the server device 10, or may be specified by the operator, and the method of specifying the degree of congestion is not particularly limited. Further, the second generation unit 119 clearly indicates the position where the abnormality occurs on the current image when the degree of congestion in the imaging range of the current camera device 20 satisfies a predetermined condition, and when it does not satisfy the condition, the second generation unit 119 clearly indicates the position where the abnormality occurs on the current image. It is also possible not to specify the position where the abnormality occurs.
In this way, when the degree of congestion is high, the relationship between the position where the abnormality occurs and the position of the observer can be displayed in an easy-to-understand manner. Further, when the degree of congestion is low, the processing load of the server device 10 and the communication load of the communication line NW2 can be reduced.

In the monitoring system 1 of the above-described embodiment, GPS was used to measure the position of the observer U. The positioning method is not limited to this. In the monitoring system 1, for example, the observer U shown in the current image may be identified by performing image recognition using the current image of the camera device 20, and the position of the observer U on the image may be specified. .. In this case, image recognition may be performed based on predetermined features such as clothes and face. Further, another method such as tag positioning may be used.

In the monitoring system 1 of the above-described embodiment, the image for output is output to the mobile terminal 30, but it may be output to another device. For example, it may be output to the operation terminal 40 so that the personnel of the monitoring center can see the past image or the current image. Further, the mobile terminal 30 may be able to display the past image and the current image at the same time.

Some of the hardware circuits, functions or operations described in the embodiments described above may be omitted. For example, the present invention does not have to perform a process of clearly indicating the position where an abnormality occurs in the current image.

The camera device 20, the mobile terminal 30, or the operation terminal 40 may have some of the functions of the server device 10 of the above-described embodiment. Some of the hardware circuits, functions or operations described in the embodiments described above may be omitted. For example, the monitoring system of the present invention may be a system that displays only one of the past image and the current image. Further, not only the abnormality detection but also the selection of the observer may be performed by the operator's judgment. Further, the action performed by the operator may be automated by using the technique of artificial intelligence. Further, the monitoring system of the present invention is not limited to monitoring the venue of the event, and can be applied to monitoring any place such as a public place.

Each function realized by the monitoring system of the above-described embodiment may be realized by one or more hardware circuits, may be realized by executing one or more programs, or may be realized by a combination thereof. It may be realized. When the function of the monitoring system is realized by using a program, this program is used for magnetic recording media (magnetic tape, magnetic disk (HDD (Hard Disk Drive), FD (Flexible Disk), etc.)), optical recording medium (optical disk, etc.). ), It may be provided in a state of being stored in a computer-readable recording medium such as an optical magnetic recording medium or a semiconductor memory, or may be distributed via a network. The present invention can also be grasped as a monitoring method.

It goes without saying that the invention of the present application is not limited to the above-described embodiment, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Absent.

1 ... Monitoring system, 10 ... Server device, 11,21,31 ... Control unit, 12 ... First communication unit, 13 ... Second communication unit, 14, 23, 34 ... Storage unit, 111 ... Acquisition unit, 112 ... Recording Unit, 113 ... Abnormality detection unit, 114 ... Selection unit, 115 ... First position identification unit, 116 ... First generation unit, 117 ... First output unit, 118 ... Second position identification unit, 119 ... Second generation unit, 120 ... 2nd output unit, 20 ... camera device, 22 ... imaging unit, 24, 35 ... communication unit, 30 ... mobile terminal, 36 ... positioning unit, 40 ... operation terminal.

Claims (7)

An acquisition unit that acquires images captured by a camera device installed in the monitoring area,
A storage unit that stores past images, which are images captured in the past by the camera device,
The first position identification unit that specifies the current position of the personnel who deal with the abnormality that occurred in the monitoring area,
A first generation unit that generates a first image in which the current position of the personnel is clearly shown on the stored past image based on the specified current position.
A monitoring system including a first output unit that outputs the first image. The monitoring system according to claim 1, wherein the first generation unit generates the first image in which the current position of the personnel is clearly indicated on the past image including at least the image at the time of abnormality captured when the abnormality occurs. .. Claim 1 or 2 is characterized in that the first position specifying unit acquires the position information of the mobile terminal possessed by the person to be dealt with and identifies the current position of the person on the image based on the position information. The monitoring system described in. The first position specifying unit according to claim 1 or 2, wherein the first position specifying unit identifies the person to be dealt with based on image analysis of the acquired image, and specifies the current position of the person on the image. Monitoring system. A second position specifying unit that identifies the abnormal position in the monitoring area, which is the position where the abnormality has occurred,
Based on the identified abnormal position, a second generation unit that generates a second image in which the abnormal position is clearly shown on the current image in which the acquired current monitoring area is captured, and
The monitoring system according to any one of claims 1 to 4, further comprising a second output unit that outputs the second image. Any one of claims 1 to 5, wherein the first generation unit generates the first image when the current degree of congestion in the imaging range of the camera device satisfies a predetermined condition. The monitoring system described in. Steps to acquire images captured by camera devices installed in the surveillance area,
A step of storing a past image, which is an image captured in the past by the camera device,
Steps to identify the current location of personnel to deal with anomalies that occur in the monitoring area,
A step of generating a first image in which the current position of the person is clearly shown on the stored past image based on the specified current position, and
A monitoring method including a step of outputting the first image.

Images