JP2011234237A - Camera controller and camera system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply set an area which is desired by a user to set masking.SOLUTION: An image obtained from a camera is displayed on a display 110 and the detection result of an object in the image is displayed on the display 110. Then, a mask area is set to the image displayed on the display 110. Then, a determination unit 105 determines whether the set mask area and the area of the detection result overlap each other and when the result of the determination by the determination unit 105 shows both of the areas overlap each other, a warning message is displayed.

Description

  The present invention relates to a camera control device, a camera system, a camera control method, and a program, and more particularly, to a technique suitable for use in performing mask processing.

  Conventionally, surveillance cameras have been installed for the purpose of crime prevention in banks, stores, department stores, condominiums, etc., and are often introduced as surveillance camera systems so that images can be monitored from a remote location via a network. Since surveillance camera systems are mainly installed in public places and residential areas, areas related to personal information, such as windows of ordinary households included in the shooting area, may be shot, which may infringe privacy. May be connected. Therefore, in order to protect privacy in such a surveillance camera, it is necessary to set a mask area for protecting privacy so as to cover a window of a general household. The setting of the mask area can be realized by designating an area to be protected while confirming the captured video by the user.

  On the other hand, in the surveillance camera system, it is necessary to record the video taken by the surveillance camera on a recording medium for security measures, and the recorded video needs to confirm the intruder who has entered the surveillance area later. It is used when In surveillance camera systems, it is common to always record images taken by surveillance cameras. However, since images from multiple surveillance cameras are recorded simultaneously, it is necessary to accumulate a huge amount of images, The burden on the monitoring side is large in terms of searchability. Therefore, a monitoring camera system has been constructed in which each monitoring camera is notified only when there is a movement with respect to a specific area, and the notification is recorded as an event with an image. At this time, when the monitoring camera detects a specific change within a previously designated area, the monitoring camera notifies the monitoring camera system of the event. Here, the detection of a specific change is, for example, detecting a moving object in the region, and the user specifies the detection target and conditions.

  However, when the monitoring camera system combining the mask area setting and the moving object detection function as described above is used, the mask area and the moving object detection area may overlap each other. Thus, for example, Patent Document 1 discloses a technique for performing mask processing based on a three-dimensional mutual positional relationship with a monitoring object in a motion region, and displaying a moving portion by removing the mask by image processing. Yes. In setting a mask area and a target area such as moving object detection, for example, Patent Document 2 discloses a technique for automatically determining a target area and setting it as one of the areas.

JP 2009-124618 A JP 2008-236673 A

  However, in the technique described in Patent Document 1 described above, the mask area is changed while dynamically detecting that a moving object has been detected in the mask-set area. Therefore, it is necessary to change the mask area in a fluid manner instead of a fixed shape, and a large load is required for mounting the surveillance camera. In the technique described in Patent Document 2 described above, the target area is automatically set. However, either the mask area or the monitoring target area for moving object detection is set, and the user's will There is a possibility that the setting is reversed.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to make it possible to easily set a region for mask setting desired by a user.

  The camera control device of the present invention displays a video acquired from a camera on a display device, displays a detection result of an object in the video on the display device, and masks the video displayed on the display device. Setting means for setting an area; and determination means for determining whether or not the mask area set by the setting means and the detection result area overlap; and the display means performs determination by the determination means. As a result, a warning display is performed when the mask area and the detection result area overlap.

  According to the present invention, the user can know from the warning that the area where the moving object is detected in the monitoring area overlaps the area to be masked, and can appropriately set the mask area for the camera.

It is a figure showing an example of schematic structure of a surveillance camera system concerning an embodiment. It is a block diagram which shows the internal structural example of the surveillance camera control apparatus which concerns on embodiment. It is a block diagram which shows the internal structural example of the surveillance camera which concerns on embodiment. It is a figure which shows an example of the image image | photographed with the surveillance camera. It is a figure which shows an example of the setting screen for setting a mask area | region. It is a flowchart which shows an example of the process sequence which sets a mask area | region. It is a flowchart which shows an example of the process sequence which sets a mask area | region. It is a figure which shows an example of the warning message when a mask area | region overlaps. It is a flowchart which shows an example of the procedure which sets the detection area | region of the monitoring target object.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a diagram illustrating a schematic configuration example of a surveillance camera system according to the present embodiment. In the surveillance camera system of this embodiment, the surveillance camera control device 1a is connected to a plurality of surveillance cameras 1c, 1d, and 1e via a network 1b such as a LAN or the Internet. In this embodiment, since it does not depend on the number of connected surveillance cameras, the connection between the surveillance camera control device 1a and the surveillance camera 1c will be described.

FIG. 2 is a block diagram illustrating an internal configuration example of the monitoring camera control device 1a according to the present embodiment.
In FIG. 2, the surveillance camera control device 1a controls the surveillance camera 1c via the network 1b as shown in FIG. The CPU 101 is for controlling the entire apparatus, and the communication unit 102 is for communicating with the network 1b. The display unit 103 performs control to display the video received from the monitoring camera on the display 110. The input / output management unit 104 manages input / output from external devices such as the keyboard 111 and the mouse 112. The determination unit 105 determines various detection functions based on video from the surveillance camera, and the recording unit 106 records received video data on a hard disk drive (HDD) 113. Each of these units is connected to the CPU 101 by an internal bus 107. The surveillance camera control device 1a is connected to a display 110, a keyboard 111, a mouse 112, and an HDD 113 which are external devices.

  Here, the operation of the monitoring camera control device 1a will be described. The user can make various settings of the monitoring camera to be controlled using the keyboard 111 and the mouse 112 while viewing the video displayed on the display 110 and the setting screen. Although the keyboard 111 and the mouse 112 are connected as input devices here, a joystick controller or a touch panel may be used. The CPU 101 generates a necessary user interface (UI) for the video of the monitoring camera 1 c and causes the display unit 103 to display it on the display 110. Furthermore, the CPU 101 updates the UI based on the input information of various external devices sent from the input / output management unit 104 and causes the display unit 103 to display the UI on the display 110. Further, the CPU 101 can display various messages such as characters indicating a warning on the UI based on the information determined by the determination unit 105.

  The recording unit 106 records video data from the monitoring camera on the HDD 113, records UI data controlled by the CPU 101 and control data of each monitoring camera, and reads past control information and setting information of the monitoring camera. be able to. The CPU 101 causes the display unit 103 to display various data as a UI as necessary.

FIG. 3 is a block diagram showing an example of the internal configuration of the monitoring camera 1c according to the present embodiment.
In FIG. 3, the surveillance camera 1c is controlled from the surveillance camera control device 1a via the network 1b. The imaging unit 120 captures a subject and generates video data. The image analysis unit 121 performs various image analyzes of the generated video data, and the analysis determination unit 122 determines the analysis result according to a preset condition.

  On the other hand, the image processing unit 123 performs image processing such as backlight correction on the video data generated by the imaging unit 120 based on the setting value set by the monitoring camera control device 1a. The communication unit 124 inputs control data from the monitoring camera control device 1a and inputs other information from the outside. Further, the communication unit 124 outputs the video data subjected to the image processing by the image processing unit 123 to the external device. In this way, the communication unit 124 controls data input / output in communication. The surveillance camera 1c also includes a mask processing unit 125 for masking a predetermined area for privacy protection. The image processing unit 123 combines the video masked by the mask processing unit 125, and the video data is combined. Can be sent to an external device.

  In addition, the result determined by the analysis determination unit 122 is stored in the storage unit 126, and the result stored by the communication unit 124 can be sent as a history in response to a request from an external device. Further, the storage unit 126 also stores information on the mask area set by the mask processing unit 125, and can transmit information on the currently set mask area in response to a request from an external device.

  Next, the operation of the monitoring camera 1c will be described. As described above, the video data input from the imaging unit 120 is subjected to image analysis by the image analysis unit 121. Usually, the surveillance camera outputs the input image (frame) continuously as a moving image. In image analysis, this input video is treated as a single image, the inside of the image (frame) is divided into fine processing unit blocks, and new images are created based on past changes in each block. Analyzes whether there has been a change in

  Next, the information changed for each block is sent to the analysis determination unit 122. The analysis determination unit 122 sets the information from the monitoring camera control device 1a and the like based on the number and time of the changed blocks, the block collection status, and the amount of change. It is determined whether or not the condition is met. Then, the analysis result is sent to the image processing unit 123, and the image processing unit 123 provides the analysis result as information synchronized with the outside through the communication unit 124 together with the video data. The analysis result by the analysis determination unit 122 and the change information analyzed by the image analysis unit 121 in units of blocks are stored in the storage unit 126. Then, the analysis result and change information stored in the storage unit 126 are transmitted via the communication unit 124 in response to a request from the external device.

FIG. 4 is a diagram illustrating an example of an image 401 captured by the monitoring camera 1c.
The angle of view of the video shot by the surveillance camera 1c is adjusted so that the entire view for surveillance purposes is contained, and the color, focus, and the like are also adjusted. However, when shooting is performed so that the entire view is contained, a house or a building of another person may be included in the captured image. Therefore, a mask area for protecting privacy is set in the captured image.

FIG. 5A is a diagram illustrating an example of a setting screen for setting a mask area displayed on the display 110 of the monitoring camera control device 1a.
As shown in FIG. 5A, the setting screen is configured as a UI 500 so that the user can make settings while viewing an actual captured image. In the captured image display area 501, a captured image of the monitoring camera 1c is displayed.

  When the user designates an area for protecting privacy in the screen using an input device such as the mouse 112, a mask setting area 502 is displayed in the captured image display area 501. At this time, the user sets a target position while viewing the image center line 503 indicating the center in the captured image. The image center line 503 is superimposed on the actual captured image so that the position and size that can be used as a guide in the UI 500 can be specified, but if the display shows the current position such as a dotted line or a broken line, it is off-screen. You may use the method of shaking a scale. The information bar 504 displays precautions at the time of setting, various messages such as error messages and warning messages, and the monitoring camera status such as the current frame rate and angle of view information.

  Items relating to mask setting include a mask setting button 505, a mask deletion button 506, a mask number selection list 507, and a mask valid check box 508 for giving a control instruction to the monitoring camera 1c. Furthermore, there is a mask color selection list 509, a text box 510 for inputting a mask name, and a mask center position coordinate display area 511. The mask setting button 505 and the mask deletion button 506 are buttons for notifying the monitoring camera 1c of control data in accordance with the setting of the mask area number, color, name, position, and the like. The mask area of the present embodiment is configured such that the color, position, and name can be designated by numbers, but the mask shape, transparency, mask size, etc. may be set.

  The mask number 513 represents the number of masks that can be simultaneously set in the monitoring camera 1c, and is selected from the mask number selection list 507. The mask color 514 represents a color covering the mask area. When the mask valid check box 508 is set to be valid, video data in which the mask is superimposed on the designated area is sent. The mask name 515 is explicitly set in the text box 510 as a name that can be easily understood by the user.

  When the motion detection result history display button 512 is selected, the detection result history in the surveillance camera is displayed in a superimposed manner on the captured image display area 501. FIG. 5B is a diagram illustrating an example of a setting screen in a state where the motion detection result history display button 512 is pressed. Here, when the motion detection result history display button 512 is selected in a state where the mask is not enabled, the motion detection result 520 is superimposed on the captured image display area 501 for each block. The detection result may change at least one of shape, color, and size according to the detection frequency for each block. The object of the present embodiment is to set the mask setting area shown in FIG. 5A and the moving object detection result history area shown in FIG. 5B so as not to overlap more than necessary.

FIG. 6 is a flowchart illustrating an example of a processing procedure for setting a mask region by the monitoring camera control device 1a. Each process shown in FIG. 6 is performed under the control of the CPU 101.
First, in step S601, mask area information is acquired from the monitoring camera 1c via the communication unit 102. In step S602, it is confirmed whether or not mask area information is set in the video imaged by the monitoring camera 1c. If it is determined that the mask area information has already been set, the display section 103 displays the mask area information as a setting item in step S603. Specifically, if the mask is valid for the mask number displayed in the mask number selection list 507, the mask valid check box 508 is set to a check state. Then, the selected mask color is displayed in the mask color selection list 509. If a mask name is input, the mask name is displayed in the text box 510, and the X and Y coordinates of the mask center position are displayed as the mask center position. Displayed in the coordinate display area 511.

  On the other hand, if the information of the mask area is not set as a result of the confirmation in step S602, the default setting value is displayed in each item described above in step S604. In step S605, the input / output management unit 104 waits for input from the user. If there is an input from the user, it is determined in step S606 whether or not a mask area has been designated. Here, the mask area can be specified by specifying a rectangular area on the captured image display area 501 or by selecting an arbitrary mask number in the mask number selection list 507. If the result of this determination is that no mask area has been designated, processing returns to step S605.

  On the other hand, if the result of determination in step S606 is that a mask area has been designated, the frame of the mask area is superimposed on the captured image display area 501 by the display unit 103 in step S607. When the mask area is designated as described above, in step S608, the input / output management unit 104 determines whether the mask setting button 505 has been selected. If the mask setting button 505 is selected as a result of this determination, in step S608, the communication unit 102 transmits mask setting information to the monitoring camera 1c, and the mask setting is completed.

  On the other hand, if the result of determination in step S608 is that the mask setting button 505 has not been selected, it is determined whether or not the mask deletion button 506 has been selected for the specified mask area. If the mask deletion button 506 is selected as a result of this determination, in step S611, information indicating that the mask in the mask area specified by the communication unit 102 is deleted is transmitted to the monitoring camera 1c, and the mask setting is completed. . On the other hand, if the result of determination in step S610 is that the mask deletion button 506 has not been selected, processing returns to step S605.

FIG. 7 is a flowchart illustrating an example of an operation procedure when a mask area is set in a state where the motion detection result history display button 512 is selected. Each process shown in FIG. 7 is performed under the control of the CPU 101.
First, in step S701, information on the result of motion detection by the monitoring camera 1c is acquired via the communication unit 102. In step S <b> 702, the input / output management unit 104 confirms whether the motion detection result history display button 512 is selected. If the motion detection result history display button 512 is selected as a result of this confirmation, the motion detection result is superimposed on the captured image display area 501 by the display unit 103 in step S703.

  On the other hand, as a result of the confirmation in step S702, if the motion detection result history display button 512 is not selected, a message prompting display of the detection result is displayed on the information bar 504 by the display unit 103 in step S704. Next, in step S705, it is determined whether or not a mask area is designated as in step S606 of FIG. If the result of this determination is that a mask area has not been designated, the processing ends.

  On the other hand, if the result of determination in step S705 is that a mask area has been specified, the frame of the mask area is superimposed on the captured image display area 501 by the display unit 103 in step S706. Next, in step S707, the determination unit 105 determines whether the mask area surrounded by the frame and the motion detection result indicated for each block overlap. As a result of this determination, if at least one block of the motion detection result overlaps the mask area, the mask area and the motion detection result area overlap the information bar 504 by the display unit 103 in step S708. A warning message to this effect is displayed. On the other hand, if the result of determination in step S707 is that there is no overlap, the message is not displayed and the operation is terminated.

  As described above, according to the present embodiment, the warning message is displayed on the UI 500 of the monitoring camera control apparatus 1a. Accordingly, the user can confirm that the area where motion detection has been performed is masked while viewing the screen, so that the mask area can be set appropriately.

FIG. 8A is a diagram showing an example of a warning message when the mask areas overlap in the motion detection result history display.
As shown in FIG. 8A, it is possible to notify the information bar 504 that the mask area has overlapped and prompt the user to reset. In addition, when it is detected that the history display area of the motion detection result overlaps with the mask area, the user can be prompted to select whether to enable or disable the mask setting.

  In the present embodiment, a method of displaying a message on the information bar 504 has been described as a way of expressing a warning message. On the other hand, in addition to the information bar 504, as it can be seen that it overlaps the frame of the mask area, the blinking interval and color of the frame and the motion detection result are changed from the case where they do not overlap, and other information display A warning may be given in combination.

(Second Embodiment)
Hereinafter, a surveillance camera system according to a second embodiment of the present invention will be described. In the present embodiment, an example in which a motion detection area is set while referring to a mask area will be described. The internal configuration of the surveillance camera control device in the surveillance camera system of this embodiment is the same as that in FIG. 2, and the internal configuration of the surveillance camera is also the same as that in FIG.

The case where the motion detection setting is performed on the monitoring target will be described with reference to FIG. FIG. 9 is a flowchart illustrating an example of a processing procedure for setting a detection area of a monitoring object. Each process shown in FIG. 9 is performed under the control of the CPU 101.
First, in step S901, the communication unit 102 communicates with the monitoring camera 1c via the network 1b. And the information of the mask area | region and motion detection area | region information which are set to the monitoring camera 1c are acquired.

  In the monitoring camera 1c, the communication unit 124 receives the request for such information, and reads the currently set mask area information and motion detection area information stored in the storage unit 126. At this time, detection results for each past block detected by the image analysis unit 121 and the analysis determination unit 122 are also read from the storage unit 126 and transmitted to the monitoring camera control device 1a by the communication unit 124. Next, in step S902, a UI for performing motion detection setting for the monitoring camera 1c is displayed on the display 110 by the display unit 103 based on the acquired information.

  FIG. 8B is a diagram illustrating an example of a UI for performing motion detection setting after setting a mask area. A UI 800 is a UI for performing motion detection setting, and a motion detection setting area 802 and an image center line 803 are superimposed and displayed in a captured image display area 801 for displaying a video from the monitoring camera 1c. The mask area has already been set and is superimposed on the captured image. Information bar 804 displays messages for various settings.

  The motion detection setting information is notified to the monitoring camera 1c when the motion detection setting button 805, the motion detection deletion button 806, or the motion detection update button 807 is selected. The motion detection region number 808 can be selected from a list box, and for each region number, a region name 809 can be set, a sensitivity 810, and a size 811 representing a ratio in the region to be detected can be set. Further, the past motion detection result history is displayed in a superimposed manner on the captured image display area 801 when the button 812 is selected. The motion detection result is superimposed and displayed in the captured image display area 801 for each block as in FIG. The detection result may change at least one of shape, color, and size according to the detection frequency for each block.

  Returning to the description of FIG. 9, next, in step S <b> 903, the determination unit 105 determines whether or not the two regions overlap based on the acquired motion detection region information and mask region information. If the result of this determination is that the motion detection area and the mask area overlap, a warning message notifying that the information bar 804 overlaps is displayed by the display unit 103 in step S904. On the other hand, if the result of determination in step S903 is that the areas do not overlap, nothing is displayed and processing proceeds to step S905. In step S905, the input / output management unit 104 confirms whether an instruction to change the setting is received from the user. If an instruction to change the setting is received as a result of this confirmation, the process returns to step S902, where new setting information is displayed, and the overlap with the mask area is checked again.

  On the other hand, as a result of the confirmation in step S905, if there is no instruction to change the setting, in step S906, the input / output management unit 104 confirms whether the motion detection setting button 805 has been selected. If the motion detection setting button 805 is selected as a result of this confirmation, it is confirmed in step S907 whether warning display has already been performed. If the warning is displayed as a result of the confirmation, it is determined that the overlap with the mask area is acceptable, and the setting is updated so that the mask area information is added as the setting information of the event notification in step S908. .

  In the notification by an event when a motion is detected in the motion detection area, information indicating that the event has occurred and in which motion detection area is usually transmitted. Therefore, when the mask areas overlap, the setting information is updated so as to notify that the captured image is partially hidden by the mask when the event occurs. On the other hand, if there is no warning display as a result of the confirmation in step S907, the current setting information is transmitted to the monitoring camera 1c in step S909, and the process is terminated.

  On the other hand, if the motion detection setting button 805 is not selected as a result of the confirmation in step S906, it is confirmed in step S910 whether the motion detection deletion button 806 has been selected. If the motion detection deletion button 806 is selected as a result of the confirmation, the selected motion detection setting information is deleted in step S911, and the process proceeds to step S909. On the other hand, as a result of the confirmation in step S910, if the motion detection deletion button 806 is not selected, it is confirmed in step S912 whether the motion detection update button 807 has been selected. If the motion detection update button 807 is selected as a result of this confirmation, the process returns to step S901 to newly acquire the setting information of the monitoring camera 1c. On the other hand, if the motion detection update button 807 is not selected as a result of the confirmation in step S912, it is regarded as the end, and in step S913, the end process is performed and the display of the UI screen is ended.

  Here, when the setting for adding the mask area information as the event notification is performed in step S908, the event notification setting information is stored from the communication unit 124 to the storage unit 126 in the monitoring camera 1c. When the analysis determination unit 122 detects the analysis result, it notifies the image processing unit 123 of the information of the overlapped mask number as an event of detection information. Then, the image processing unit 123 sends the event information together with the video data to the monitoring camera control device 1a via the communication unit 124. The information of the mask area of the event notification is not limited to the mask number but may be any value indicating the mask information, including at least the mask such as the mask number, mask name, and mask coordinates. It only has to be done. Here, in the monitoring camera control device 1a, when there is information on the mask area in the event notification from the monitoring camera 1c, the user may be notified of the setting change.

  In addition, a method for displaying a message on the information bar 804 has been described as a way of expressing the warning message. On the other hand, in addition to the information bar 804, the blinking interval or the color of the motion detection result or the color is changed so that it can be seen that it overlaps the frame of the mask area, and combined with other information display May be warned.

  As described above, according to the present embodiment, the motion detection region can be changed when priority is given to the setting of the mask region.

(Other embodiments)
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.

101 CPU, 102 communication unit, 103 display unit, 105 determination unit

Claims (15)

Display means for displaying the image acquired from the camera on the display device, and displaying the detection result of the object in the image on the display device;
Setting means for setting a mask area on the video displayed on the display device;
Determining means for determining whether or not the mask area set by the setting means and the detection result area overlap;
The camera control apparatus, wherein the display means displays a warning when the mask area and the detection result area overlap as a result of the determination by the determination means.   The camera control apparatus according to claim 1, wherein the detection result area is an area in which the object is detected as a moving object.   The camera control apparatus according to claim 1, wherein the detection result includes information on a position and a change amount of the object.   The camera control apparatus according to claim 1, wherein the display unit displays a warning with characters.   5. The display unit according to claim 1, wherein the display unit displays a warning by changing a color or a blinking interval with respect to a frame indicating the mask region set by the setting unit or the detection result of the object. The camera control device according to any one of the above. A camera system comprising: a camera that captures an image; and a camera control device that acquires and displays the image from the camera via a network,
The camera
Imaging means;
Detecting means for detecting a predetermined object with respect to the video imaged by the imaging means;
Mask means for masking a mask area set by the camera control device;
Storage means for storing the detection result by the detection means,
The camera control device includes:
Displaying the image acquired from the camera on a display device, and displaying the detection result of the object in the image on the display device;
Setting means for setting a mask area on the video displayed on the display device;
Determining means for determining whether or not the mask area set by the setting means and the detection result area overlap;
The display means displays a warning when the mask area and the detection result area overlap as a result of the determination by the determination means.   The camera system according to claim 6, wherein the detection result area is an area in which the object is detected by the detection unit.   The camera system according to claim 6 or 7, wherein the detection result includes information on a position and a change amount of the object.   The camera system according to claim 6, wherein the display unit displays a warning by using characters.   10. The display unit performs warning display by changing a color or a blinking interval with respect to a frame indicating a mask region set by the setting unit or a detection result of the object. The camera system according to any one of the above.   11. The display device according to claim 6, wherein, as a result of determination by the determination unit, when the mask region and the detection result region overlap, the display unit displays information on the mask region. The camera system according to item.   The camera system according to claim 11, wherein the display unit includes at least one of a number, a color, coordinates, a mask name, and a mask size as the information of the mask area. A display step of displaying a video acquired from a camera on a display device, and displaying a detection result of an object in the video on the display device;
A setting step of setting a mask area in the video displayed on the display device;
A determination step of determining whether or not the mask region set in the setting step and the detection result region overlap,
In the display step, a warning display is performed when the mask region and the detection result region overlap as a result of the determination in the determination step. A camera control method executed by a camera that shoots video and a camera control device that acquires and displays the video from the camera via a network,
A detection step of detecting a predetermined object with respect to an image captured by the camera;
A mask process for masking a mask region set by the camera control device;
A storage step of storing a detection result in the detection step in a storage unit;
Displaying the video acquired from the camera on a display device, and displaying the detection result of the object in the video on the display device;
A setting step of setting a mask area in the video displayed on the display device;
A determination step of determining whether or not the mask region set in the setting step and the detection result region overlap,
In the display step, a warning display is performed when the mask region and the detection result region overlap as a result of the determination in the determination step. A display step of displaying a video acquired from a camera on a display device, and displaying a detection result of an object in the video on the display device;
A setting step of setting a mask area in the video displayed on the display device;
Causing the computer to execute a determination step of determining whether or not the mask region set in the setting step and the detection result region overlap;
In the display step, a warning is displayed when the mask region and the detection result region overlap as a result of the determination in the determination step.

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