JP2018173501A - Display controller and method for display control - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce overlooking of occurrence of emergencies such as persons with acute illness.SOLUTION: The present invention includes: an acquisition part 341 for acquiring an image generated by an imaging device set in a platform of a station; a specification unit 342 for specifying a visual recognition target object that not smaller than a predetermined number of people are visually recognizing at the same time on the basis of the directions of persons in the image; and a display control unit 343 for displaying the image including the visual recognition target object specified by the specification unit 342 in a display device. The configuration as described above can reduce overlooking of occurrence of emergencies such as persons with acute illness.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a display control device and a display control method for displaying an image on a display device.

  In order to check the situation of passengers on the railway, it is widely practiced to arrange a plurality of surveillance cameras on the station platform. For example, Patent Document 1 describes storing an image taken by a camera arranged on a station platform in a server.

Japanese Patent Laying-Open No. 2015-176478

  In order to reduce the blind spot between a plurality of cameras arranged on the platform of the station, it is desirable to arrange as many cameras as possible on the platform. However, if an attempt is made to simultaneously check captured images captured by a large number of cameras, there has been a problem of overlooking the occurrence of an emergency such as a sudden illness.

  Therefore, the present invention has been made in view of these points, and an object of the present invention is to provide a display control device and a display control method capable of suppressing the occurrence of an emergency such as a suddenly ill person.

  The display control device according to the first aspect of the present invention includes a predetermined number based on an acquisition unit that acquires a captured image generated by an imaging device installed on a platform of a station, and a direction of a person included in the captured image. It has a specific part which specifies the visual recognition object which the above person is visually recognizing simultaneously, and a display control part which displays an image including the visual recognition object which the specific part specified on a display device.

  The specifying unit specifies a ratio of people who are viewing the object to be viewed with respect to a plurality of people included in the captured image, and the display control unit is configured such that the ratio specified by the specifying unit is equal to or greater than a predetermined value. In this case, an image including the visual recognition object may be displayed on the display device.

  The acquisition unit acquires a plurality of the captured images, and the specifying unit continuously recognizes the visual target object by a person included in the captured image based on the plurality of captured images. The continuous visual recognition time which is time may be specified, and the display control unit may display an image including the visual recognition object on the display device when the continuous visual recognition time is equal to or longer than a predetermined time.

  The display control unit detects that a plurality of people have left the viewing object after the identifying unit identifies the viewing object, or that a plurality of people gathered in the viewing object. If detected, warning information may be output.

  The acquisition unit further acquires sound information indicating sound collected within a predetermined range from the imaging device, and the specifying unit specifies the visual target object when the sound information satisfies a predetermined condition Processing may be started.

  The display control method according to the second aspect of the present invention is based on the step of acquiring a captured image generated by an imaging device installed on a platform of a station, which is executed by a computer, and the orientation of a person included in the captured image. And a step of specifying a visual recognition object that is simultaneously viewed by a predetermined number of people and a step of displaying an image including the specified visual recognition object on a display device.

  According to the present invention, it is possible to suppress the occurrence of an emergency such as a suddenly ill person from being overlooked.

It is a figure which shows the structure of a monitoring system. The captured image produced | generated by the imaging device is shown. It is a figure which shows the structure of an imaging device. It is a figure which shows the structure of a server. The state which imaged the passenger with the imaging device is shown. The directions of a plurality of passengers in a captured image generated by the imaging device are shown. It is a flowchart which shows an example of operation | movement of a display control apparatus.

<Embodiment>
[Overview of monitoring system S configuration]
FIG. 1 is a diagram illustrating a configuration of the monitoring system S. The monitoring system S is provided at a railway station, and identifies an emergency such as a sudden illness of a passenger on a railway or a fight between passengers based on images captured by a plurality of cameras. The monitoring system S displays the captured image of the camera capturing the identified emergency situation among the captured images of the plurality of cameras.

  The monitoring system S includes a plurality of imaging devices 1, a hub 2, a server 3, and a monitor 4. The imaging device 1 is, for example, a stereo camera having a plurality of imaging units, and is installed at a position where the vicinity of a train door stopped on the platform can be imaged. Each of the plurality of imaging devices 1 is installed at a position where the vicinity of one door of the train can be imaged, and is connected in a daisy chain.

  An imaging device group including a plurality of imaging devices 1 connected in a daisy chain is provided for each platform. A plurality of imaging device groups installed on a plurality of platforms (for example, homes A to C in FIG. 1) are connected to the hub 2, and captured images generated by the imaging devices 1 of the plurality of imaging device groups are: It is transmitted to the server 3 via the hub 2.

  The server 3 is a display control device that generates image data to be displayed on the monitor 4. The server 3 acquires captured images from the plurality of imaging devices 1. The server 3 analyzes the captured image. Specifically, the server 3 specifies a visual target that is visually recognized by a predetermined number or more of passengers by detecting the direction of the passengers reflected in the captured image. The predetermined number is, for example, an arbitrary number of two or three or more. The server 3 causes the monitor 4 to display a captured image including the identified visual recognition object among the captured images corresponding to the plurality of imaging devices 1. The monitor 4 is a display device arranged in a station staff room or the like.

[Overview of operation of monitoring system S]
With reference to FIG. 2, the outline | summary of operation | movement of the monitoring system S is demonstrated. 2A and 2B show captured images generated by the imaging device 1. FIG. In FIGS. 2A and 2B, the direction of the passenger P1 is indicated by an arrow. The passenger P1 whose direction could not be detected in the monitoring system S is not attached with an arrow. FIG. 2A is a captured image by the imaging device 1 in a normal state, and shows a large number of passengers P1 in the vicinity of the door of the railway vehicle. Some passengers P1 are facing the direction of the door of the railway vehicle, and the moving passengers P1 are facing the moving direction.

  FIG. 2B is a captured image by the imaging device 1 when an emergency situation occurs. For example, when an emergency such as a sudden illness occurs, a large number of passengers P1 face the parties of the emergency. Therefore, in the monitoring system S, occurrence of an emergency situation is specified by detecting the directions of the plurality of passengers P1. Hereinafter, the configuration of the imaging device 1 and the server 3 will be described in detail.

[Configuration of Imaging Device 1]
FIG. 3 is a diagram illustrating a configuration of the imaging apparatus 1. The imaging device 1 includes a first imaging unit 11, a second imaging unit 12, a microphone 13, a communication unit 14, a storage unit 15, and a control unit 16.

  Each of the first imaging unit 11 and the second imaging unit 12 includes a lens and an imaging element, and generates a captured image. The first imaging unit 11 and the second imaging unit 12 are provided side by side in a direction parallel to the surface of the platform, and parallax exists between the first imaging unit 11 and the second imaging unit 12. Therefore, the server 3 can generate a three-dimensional image by using the captured image generated by the first imaging unit 11 and the captured image generated by the second imaging unit 12. The server 3 can detect the direction and movement of the passenger P1 with high accuracy by analyzing the three-dimensional image.

  The microphone 13 collects sound within a predetermined range from the imaging device 1 and inputs sound information indicating the collected sound to the control unit 16. The communication unit 14 is a communication interface for transmitting captured images generated by the first imaging unit 11 and the second imaging unit 12 and sound information collected by the microphone 13. The communication unit 14 transmits the captured image and sound information to the adjacent imaging device 1. The communication units 14 of the plurality of imaging devices 1 transmit captured images and sound information to the adjacent imaging devices 1, respectively, so that the captured images and sound information generated by all the imaging devices 1 reach the server 3.

  The storage unit 15 includes a storage medium such as a hard disk, a ROM (Read Only Memory), and a RAM (Random Access Memory). The storage unit 15 temporarily stores captured images generated by the first imaging unit 11 and the second imaging unit 12. The storage unit 15 stores a program executed by the control unit 16.

  The control unit 16 is, for example, a CPU (Central Processing Unit), and controls each unit of the imaging apparatus 1 by executing a program stored in the storage unit 15. For example, the control unit 16 causes the first imaging unit 11 and the second imaging unit 12 to generate a captured image. Further, the control unit 16 transmits the captured images generated by the first imaging unit 11 and the second imaging unit 12 to the server 3 via the communication unit 14. Further, the control unit 16 transmits the sound information collected by the microphone 13 to the server 3 via the communication unit 14.

[Configuration of Server 3]
FIG. 4 is a diagram illustrating a configuration of the server 3. The server 3 includes a monitor connection unit 31, a communication unit 32, a storage unit 33, and a control unit 34. The monitor connection unit 31 is a communication interface for causing the monitor 4 to display the image data generated by the control unit 34. The communication unit 32 is a communication interface for transmitting and receiving data to and from the plurality of imaging devices 1. The communication unit 32 receives, for example, a captured image and sound information generated by the imaging device 1 via the hub 2.

  The storage unit 33 includes a storage medium such as a hard disk, a ROM, and a RAM. The storage unit 33 temporarily stores a plurality of captured images received from each of the plurality of imaging devices 1. The storage unit 33 stores a program executed by the control unit 34.

  The control unit 34 is, for example, a CPU. The control unit 34 functions as an acquisition unit 341, a specification unit 342, and a display control unit 343 by executing a program stored in the storage unit 33. The acquisition unit 341 acquires the captured image and sound information generated by the imaging device 1 by the communication unit 32. The acquisition unit 341 acquires a plurality of captured images and sound information corresponding to each imaging device 1.

  Based on the orientation of the passenger P1 included in the captured image, the specifying unit 342 specifies a visual target object that is simultaneously viewed by a predetermined number or more of the passengers P1. The predetermined number is, for example, an arbitrary number of two or three or more. For example, the identifying unit 342 detects the orientation of the face as the orientation of the passenger P1. The identification unit 342 inputs a captured image including the identified visual target object to the display control unit 343 as a caution image that needs to be displayed on the monitor 4.

[Detection of passenger direction by specific unit 342]
With reference to FIG. 5, the detection method of the direction of the passenger P1 by the specific | specification part 342 is demonstrated. FIG. 5 shows a state where the passenger P1 is imaged by the imaging device 1. The imaging device 1 is attached to a relatively high position of the platform in consideration of not causing any trouble in the imaging range even when it is congested. For example, the imaging device 1 images the head and shoulders of the passenger P1 from above. First, the specification unit 342 specifies the direction of the shoulder width of the passenger P1 and sets the direction to the back direction in which the side blackened by the hair is facing in the direction perpendicular to the direction of the shoulder width. Moreover, the specific | specification part 342 detects the direction of the face part which is not black with hair as a direction of the passenger P1, as shown by the arrow.

[Identification of object to be visually recognized by passenger P1 by specifying unit 342]
With reference to FIG. 6, the identification method of the visual recognition target object of the several passengers P1 by the specific | specification part 342 is demonstrated. FIG. 6 shows a plurality of passengers P1 in the captured image generated by the imaging device 1. The arrow is a face direction line extending along the direction of each passenger P1. The identifying unit 342 draws a face-facing line in the captured image, and identifies a viewing area C through which the face-facing line passes per unit area as a viewing object. The visual recognition area C specified in the example of FIG. 6 is indicated by a broken line.

  Note that the specifying unit 342 may be configured to specify a visual recognition object using a plurality of captured images corresponding to different imaging devices 1. For example, the specifying unit 342 generates a composite image obtained by combining the captured images generated by the plurality of imaging devices 1 with a known image composition technique, and draws a face-facing line in the generated composite image, thereby visually recognizing the target. You may identify things.

  Further, the specifying unit 342 determines whether or not the specified visual target object needs to be displayed on the monitor 4. Examples of objects to be visually recognized that need to be displayed on the monitor 4 include suddenly ill people, fights between passengers, suspicious objects, and fires. The identifying unit 342 identifies the proportion of passengers who are viewing the visual target object with respect to a plurality of passengers included in the captured image. When an emergency situation occurs, there is a high possibility that a large number of passengers in the vicinity will see the same object to be viewed. Therefore, the specifying unit 342 determines the urgency of the visual target object by specifying the proportion of passengers who are viewing the visual target object. The specifying unit 342 may specify the ratio by excluding the number of passengers whose directions cannot be detected from the number of the plurality of passengers P1 included in the captured image.

  When the specified ratio is equal to or greater than a predetermined value, the specifying unit 342 inputs a captured image including the visual recognition target object to the display control unit 343 as a caution image that needs to be displayed on the monitor 4. The predetermined value is a value for determining an emergency and is, for example, 30 to 40%. When the specified ratio is less than the predetermined value, the specifying unit 342 determines that the captured image including the visual target object is not a caution image, and does not input the captured image to the display control unit 343.

  By the way, generally passenger P1 tends to visually recognize a visual recognition object for a long time, so that the urgency of a visual recognition object is high. Therefore, the specifying unit 342 specifies the continuous viewing time, which is the time during which the passenger P1 included in the captured image is continuously viewing the visual target object, based on the plurality of captured images. The plurality of captured images are captured images that are generated by the same image capturing apparatus 1 while shifting the capturing timing. The continuous visual recognition time is, for example, the time from the time when the visual target is identified by the identifying unit 342 to the time when the captured image is first determined by the identifying unit 342 that the passenger P1 no longer visually recognizes the visual object.

  When the continuous visual recognition time is equal to or longer than a predetermined reference time, the specifying unit 342 determines that the captured image including the visual target object is a caution image, and inputs the captured image to the display control unit 343. The reference time is a value for determining the urgency of the visual target object, and is, for example, 3 to 4 seconds. On the other hand, when the continuous visual recognition time is less than the reference time, the specifying unit 342 determines that the captured image including the visual target object is not a caution image and does not input the captured image to the display control unit 343.

  Moreover, the specific | specification part 342 estimates the urgency of a visual recognition object by detecting the motion of the passenger P1 resulting from a visual recognition object, after specifying a visual recognition object. For example, when the visually recognized object is a fight between the passengers P1, it is assumed that a plurality of passengers P1 detect a movement away from the visually recognized object in the identifying unit 342 in order to avoid danger. Moreover, when the visual recognition target object is a sudden illness person, it is assumed in the specific | specification part 342 that the movement where several passengers P1 gather on a visual recognition target object for rescue is detected. Therefore, the specifying unit 342 monitors the movement of the passenger P1 after detecting the visual recognition object, and detects the passenger P1 that is away from the visual recognition object and the passenger P1 that gathers at the visual recognition object after detecting the visual recognition object. .

  The identification unit 342 includes a visual recognition object when detecting a plurality of passengers who move away from the visual recognition object after identifying the visual recognition object or a plurality of passengers gathering in the visual recognition object after specifying the visual recognition object. It is determined that the captured image is an emergency image that is even more urgent than the image that requires attention, and the captured image is input to the display control unit 343. On the other hand, the specifying unit 342 does not detect a plurality of passengers who are separated from the visual target object after specifying the visual target object, and does not detect a plurality of passengers gathering in the visual target object after specifying the visual target object It is determined that the captured image including the visual recognition object is not an emergency image.

  In the present embodiment, the specifying unit 342 starts the process of specifying the visual target object when the sound information acquired by the acquiring unit 341 satisfies a predetermined condition. The predetermined condition is, for example, that the microphone 13 of the imaging apparatus 1 detects a loud voice such as a person's scream, or an announcement that is louder than a sound normally audible on a platform and an announcement in a station premises or a running sound of a railway vehicle. It means that a different sound was detected.

  In addition, when there exists an electronic bulletin board etc. in the position which the passenger P1 can see from a platform, it will be in the situation close | similar to the case where emergency situations, such as a suddenly ill person, occur in that many passengers P1 visually recognizes an electronic bulletin board. However, displaying the captured image including the electronic bulletin board on the monitor 4 is not preferable from the viewpoint of specifying an emergency situation. Then, the memory | storage part 33 has memorize | stored the article | item registered beforehand as an article | item with the possibility that the passenger P1 may pay attention and low urgency. In addition, when the visual recognition target is an article stored in advance in the storage unit 33 as an article with low urgency, the specifying unit 342 corresponds to the captured image including the visual recognition object as both a caution image and an emergency image. It is determined that the captured image is not input, and the captured image is not input to the display control unit 343.

  The display control unit 343 causes the monitor connection unit 31 to display the caution image and the emergency image input from the specifying unit 342 on the monitor 4. The display control unit 343 displays the caution image and the emergency image on the monitor 4 with different modes. For example, when displaying an emergency image on the monitor 4, the display control unit 343 causes the monitor 4 to display it together with warning information indicating the occurrence of an emergency. On the other hand, when displaying a caution image on the monitor 4, warning information is not displayed, but information different from the warning information may be displayed together with the caution image. Further, the display control unit 343 may output the warning information by voice.

  In addition, the specifying unit 342 specifies the proportion of passengers who are visually recognizing the visual target object with respect to a plurality of passengers included in the captured image. The display control unit 343 may cause the monitor 4 to display an image including the visual recognition object with an image quality corresponding to the ratio specified by the specifying unit 342. “Image quality” includes an enlargement ratio, a frame rate, a resolution, and the like. By adopting such a configuration, when a highly urgent situation occurs, a person who confirms the monitor 4 can grasp the state of the visual target object more accurately.

[Flowchart of Server 3 Operation]
FIG. 7 is a flowchart illustrating an example of the operation of the server 3. This processing procedure starts when the sound information acquired by the acquisition unit 341 satisfies a predetermined condition, for example, when the microphone 13 of the imaging device 1 detects a loud voice such as a human scream.

  First, the acquisition unit 341 acquires the captured image generated by the imaging device 1 by the communication unit 14 (S11). The identifying unit 342 detects the direction of the passenger P1 included in the captured image (S12). Based on the detected direction of the passenger P1, the specifying unit 342 specifies a visual recognition object that is simultaneously viewed by a predetermined number of passengers P1 (S13).

  The identifying unit 342 compares the continuous viewing time, which is the time during which the passenger P1 is continuously viewing the visually recognized object, with a predetermined reference time (S14). When the continuous visual recognition time is equal to or longer than the predetermined reference time (YES in S14), the identifying unit 342 identifies the proportion of passengers viewing the visual target object with respect to a plurality of passengers included in the captured image. The specifying unit 342 compares the specified ratio with a predetermined value (S15). When the specified ratio is equal to or greater than the predetermined value (YES in S15), the specifying unit 342 reads out from the storage unit 33 an article that is likely to be noticed by the passenger P1 and registered in advance as an article having low urgency. Furthermore, the specifying unit 342 compares the visual recognition object with the registered article (S16).

  If the display control unit 343 determines that the visual target is not an article registered in the specifying unit 342 (NO in S16), the display control unit 343 displays a captured image including the visual target on the monitor 4 (S17). The identifying unit 342 determines whether or not a plurality of passengers leaving the visually recognized object after identifying the visually recognized object or a plurality of passengers gathering in the visually recognized object after identifying the visually recognized object are detected (S18). . When the display control unit 343 detects a plurality of passengers who move away from the visual recognition object after specifying the visual recognition object in the specification unit 342 or a plurality of passengers gathering in the visual recognition object after specifying the visual recognition object ( Warning information indicating the occurrence of an emergency situation is displayed on the monitor 4 (S19), and the process ends.

  If the continuous viewing time is less than the reference time in the determination in step S14 (NO in S14), the display control unit 343 ends the process without displaying the captured image on the monitor 4. Further, the display control unit 343 determines that the ratio of the number of passengers viewing the visual target object to the plurality of passengers included in the captured image in the determination in step S15 is less than a predetermined value (NO in S15). Is not displayed on the monitor 4 and the process is terminated.

  If the specifying unit 342 determines in step S16 that the object to be viewed is a registered article (YES in S16), the display control unit 343 performs processing without displaying the captured image on the monitor 4. finish. The display control unit 343 has not detected any of a plurality of passengers leaving the visual recognition object after specifying the visual recognition object in the specifying unit 342 and a plurality of passengers gathering in the visual recognition object after specifying the visual recognition object. In this case (NO in S18), the process is terminated without displaying the warning information on the monitor 4.

  According to the present embodiment, the specifying unit 342 specifies a visual target object that is simultaneously viewed by a predetermined number or more of passengers P1, and the display control unit 343 monitors the visual target object specified by the specifying unit 342. 4 is displayed. For this reason, when an emergency situation such as a sudden illness occurs, a captured image including a visual target object such as a party in an emergency situation can be displayed on the monitor 4. Can be detected.

  Moreover, according to this Embodiment, the display control part 343 is a visual recognition object, when the ratio of the passenger P1 who is visually recognizing the visual recognition object with respect to the several passenger P1 contained in a captured image is more than predetermined value. An image including an object is displayed on the monitor 4. When an emergency situation occurs, there is a high possibility that a large number of passengers in the vicinity will see the same object to be viewed. Since the display control unit 343 causes the monitor 4 to display a visual object having a predetermined percentage or more of the passengers who are viewing the visual object, it is possible to accurately display the visual object having high urgency.

  Moreover, according to this Embodiment, the display control part 343 displays the captured image containing a visual recognition target object on the monitor 4, when continuous visual recognition time is more than predetermined reference time. Passenger P1 tends to visually recognize a visual recognition object for a long time, so that the urgency of a visual recognition object is high. Since the display control unit 343 displays the visual recognition object whose continuous visual recognition time is equal to or longer than the predetermined reference time on the monitor 4, it is possible to display the visual object having high urgency with high accuracy.

  Further, according to the present embodiment, the display control unit 343 does not display the captured image including the visual recognition object on the monitor 4 when the visual recognition object is a predetermined article. The display control unit 343 suppresses display on the monitor 4 of a captured image that includes the article as a visual target object by specifying in advance an article that is likely to be noticed by the passenger P1 and is less urgent. Can do.

  In addition, according to the present embodiment, the display control unit 343 detects when the identifying unit 342 detects that a plurality of passengers have left the viewing object after the identifying unit 342 identifies the viewing object, or visually When it is detected that a plurality of passengers gathered on the object, warning information is output. When a plurality of passengers are separated from the visual target object, a dangerous situation such as a fight between passengers may occur. In addition, when a plurality of passengers gather on the object to be visually recognized, there is a possibility that a situation requiring rescue such as a sudden illness has occurred. For this reason, the display control part 343 can alert the person who confirms the monitor 4 by outputting warning information according to the motion of the passenger around the visual recognition object.

  In addition, according to the present embodiment, the acquisition unit 341 further acquires sound information indicating sound collected within a predetermined range from the imaging device, and the specifying unit 342 is configured when the sound information satisfies a predetermined condition. The process for specifying the visual recognition object is started. Since the identification unit 342 identifies the visual recognition object when the sound information satisfies a predetermined condition, it is possible to prevent the visual recognition object from being erroneously identified.

  In the present embodiment, an example has been described in which the display control unit 343 displays a captured image including a visual target object on the monitor 4. However, the present invention is not limited to displaying the entire captured image on the monitor 4. For example, the display control unit 343 may be configured to enlarge and display the peripheral portion of the visual recognition object on the monitor 4 among the captured images including the visual recognition object.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment, A various deformation | transformation and change are possible within the range of the summary. is there. For example, the specific embodiments of device distribution / integration are not limited to the above-described embodiments, and all or a part of them may be configured to be functionally or physically distributed / integrated in arbitrary units. Can do. In addition, new embodiments generated by any combination of a plurality of embodiments are also included in the embodiments of the present invention. The effect of the new embodiment produced by the combination has the effect of the original embodiment.

DESCRIPTION OF SYMBOLS 1 Imaging device 2 Hub 3 Server 4 Monitor 11 1st imaging part 12 2nd imaging part 13 Microphone 14 Communication part 15 Storage part 16 Control part 31 Monitor connection part 32 Communication part 33 Storage part 34 Control part 341 Acquisition part 342 Identification part 343 Display control unit C Viewing area P1 Passenger S Monitoring system

Claims (6)

An acquisition unit that acquires a captured image generated by an imaging device installed on a platform of the station;
Based on the orientation of the person included in the captured image, a specifying unit that specifies a visual target that is simultaneously viewed by a predetermined number of persons,
A display control unit that causes a display device to display an image including the visual recognition object specified by the specifying unit;
A display control device. The specifying unit specifies a ratio of people viewing the object to be viewed with respect to a plurality of people included in the captured image,
The display control unit causes the display device to display an image including the visual recognition object when the ratio specified by the specifying unit is a predetermined value or more.
The display control apparatus according to claim 1. The acquisition unit acquires a plurality of the captured images,
The identifying unit identifies a continuous viewing time, which is a time during which a person included in the captured image is continuously viewing the visual object based on the plurality of captured images,
The display control unit causes the display device to display an image including the visual recognition object when the continuous visual recognition time is a predetermined time or more.
The display control apparatus according to claim 1 or 2. The display control unit detects that a plurality of people have left the viewing object after the identifying unit identifies the viewing object, or that a plurality of people gathered in the viewing object. Output warning information when detected,
The display control apparatus as described in any one of Claim 1 to 3. The acquisition unit further acquires sound information indicating sound collected within a predetermined range from the imaging device,
The specifying unit starts a process of specifying the visual recognition object when the sound information satisfies a predetermined condition.
The display control apparatus as described in any one of Claim 1 to 4. The computer runs,
Obtaining a captured image generated by an imaging device installed on a station platform;
Based on the orientation of the person included in the captured image, identifying a visual recognition object that is simultaneously viewed by a predetermined number of people,
Displaying an image including the identified visual recognition object on a display device;
A display control method.

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