Radio wave sensor installation support device, computer program, and radio wave sensor installation position determination method

Abstract

To provide a user with information useful for installing a radio-wave sensor.SOLUTION: A radio-wave sensor installation assistance device includes: a target position decision unit that decides, in an image including a crosswalk, a target position for radio-wave radiation by a radio-wave sensor; a candidate position designation unit that receives, from a user, a designation of a candidate position which is a candidate for an installation position of the radio-wave sensor in the image; and a display control unit that causes a display device to display a radio-wave radiation range of the radio-wave sensor determined based on the decided target position and the designated candidate position so as to superimpose it on the image. The candidate position designation unit can receive, from the user, an instruction for movement of the designated candidate position. The display control unit fixes the target position and changes the shape of the radio-wave radiation range in accordance with the movement of the candidate position instructed by the user.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a radio wave sensor installation support device, a computer program, and a method for determining an installation position of a radio wave sensor. [Background technology]

[0002] Patent Document 1 discloses an axis adjustment device that adjusts the axis of an on-board radar mounted on a vehicle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-68746 Summary of the Invention [Problem to be solved by the invention]

[0004] Driving Safety Support Systems (DSSS) provide vehicles with vehicle and pedestrian information via road-to-vehicle communication at intersections with poor visibility, alerting drivers to prevent traffic accidents. For this traffic monitoring purpose, radio wave sensors (hereinafter referred to as "infrastructure radio wave sensors") are installed on roads or intersections. Infrastructure radio wave sensors, which are designed to detect pedestrians at crosswalks in particular, are installed near intersections, but many obstacles, such as utility poles, traffic lights, traffic signal controllers, buildings, and shrubs, can obstruct installation. The range of radio wave radiation varies depending on the location of the infrastructure radio wave sensor, making some locations unsuitable for installation. To determine the installation location of such infrastructure radio wave sensors, workers must inspect the site to determine suitable locations. Therefore, determining the installation location of infrastructure radio wave sensors is dependent on the skill of the workers, resulting in significant costs and time. [Means for solving the problem]

[0005] A radio wave sensor installation assistance device according to one aspect of the present disclosure includes a target position determination unit that determines a target position for radio wave irradiation by a radio wave sensor in an image that includes a crosswalk; a candidate position designation unit that accepts designation from a user of candidate positions in the image that are candidates for installation positions of the radio wave sensor; and a display control unit that causes a display device to display, superimposed on the image, a radio wave irradiation range of the radio wave sensor that is determined based on the determined target position and the designated candidate position, wherein the candidate position designation unit is capable of receiving an instruction from the user to move the designated candidate position, and when the candidate position designation unit accepts the instruction to move, the display control unit changes the shape of the radio wave irradiation range in accordance with the movement of the designated candidate position, while keeping the target position fixed.

[0006] A computer program according to one aspect of the present disclosure is a computer program for causing a computer to assist in the installation of a radio wave sensor, and causes the computer to function as: a target position determination unit that determines a target position for radio wave irradiation by the radio wave sensor in an image that includes a crosswalk; a candidate position designation unit that accepts, in the image, designation from a user of candidate positions that are candidates for installation positions of the radio wave sensor; and a display control unit that causes a display device to display, superimposed on the image, the radio wave irradiation range of the radio wave sensor that is determined based on the determined target position and the designated candidate position, wherein the candidate position designation unit is capable of receiving an instruction from the user to move the designated candidate position, and when the candidate position designation unit receives the instruction to move, the display control unit changes the shape of the radio wave irradiation range in accordance with the movement of the designated candidate position, while keeping the target position fixed.

[0007] A method for determining an installation position for a radio wave sensor according to one aspect of the present disclosure is a method for determining an installation position for a radio wave sensor using an installation support device that supports the installation of the radio wave sensor, the method including the steps of: specifying candidate positions that are candidates for the installation position of the radio wave sensor in an image including a crosswalk displayed on the installation support device, thereby causing the installation support device to display a target position for radio wave irradiation by the radio wave sensor and a radio wave irradiation range of the radio wave sensor that is determined based on the specified candidate position, superimposed on the image; and instructing the installation support device to move the specified candidate position, thereby causing the installation support device to change the shape of the radio wave irradiation range in accordance with the movement of the instructed candidate position, while keeping the target position fixed.

[0008] The present disclosure can be realized not only as an installation support device for radio wave sensors having the above-described characteristic configuration and a computer program for causing a computer to function as an installation support device, but also as an installation support method for infrastructure radio wave sensors that includes characteristic processing steps, or as an installation support system for radio wave sensors that includes an installation support device. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to provide users with information that is useful for installing infrastructure radio wave sensors. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram illustrating an example of use of an infrastructure radio wave sensor according to an embodiment. [Figure 2] FIG. 2 is a block diagram illustrating an example of a hardware configuration of the installation assistance device according to the embodiment. [Figure 3] FIG. 2 is a functional block diagram illustrating an example of functions of the installation support device according to the embodiment. [Figure 4] FIG. 10 is a diagram showing an example of an installation position determination screen on which an image including a pedestrian crossing is displayed. [Figure 5]5 is an enlarged view showing an image displayed on the installation position determination screen in FIG. 4. FIG. [Figure 6] FIG. 10 is a diagram showing an example of an image including a pedestrian crossing on which a radio wave irradiation range is superimposed. [Figure 7A] FIG. 10 is a diagram for explaining an example of rank A. [Figure 7B] FIG. 10 is a diagram for explaining an example of rank B. [Figure 7C] FIG. 10 is a diagram illustrating an example of rank C. [Figure 7D] FIG. 10 is a diagram for explaining an example of rank D. [Figure 7E] FIG. 10 is a diagram for explaining an example of rank E. [Figure 8] FIG. 10 is a diagram showing an example of an installation position determination screen on which the evaluation result of one candidate position is displayed. [Figure 9] 10A and 10B are diagrams illustrating an example of transition of the radio wave irradiation range in response to continuous changes in the coordinates of the candidate position. [Figure 10] FIG. 10 is a diagram showing an example of an installation position determination screen when an area including a plurality of candidate positions is specified. [Figure 11] FIG. 10 is a diagram showing an example of an installation position determination screen on which evaluation results of a plurality of candidate positions are displayed. [Figure 12] FIG. 10 is a diagram illustrating an example of a form. [Figure 13] 10 is a flowchart illustrating an example of a procedure for image input processing. [Figure 14] 10 is a flowchart illustrating an example of a procedure for a planned detection area determination process. [Figure 15] 10 is a flowchart illustrating an example of a procedure for obstacle setting processing. [Figure 16] 10 is a flowchart showing an example of a procedure for a first installation position determination support process. [Figure 17] 10 is a flowchart illustrating an example of a procedure for an evaluation process. [Figure 18] 10 is a flowchart showing an example of a procedure for a second installation position determination support process. [Figure 19] 10 is a flowchart illustrating an example of a procedure for a form output process. DETAILED DESCRIPTION OF THE INVENTION

[0011] <Summary of Embodiments of the Present Disclosure> The following provides an outline of embodiments of the present disclosure.

[0012] (1) A radio wave sensor installation support device according to this embodiment includes a target position determination unit that determines a target position for radio wave irradiation by a radio wave sensor in an image including a crosswalk, a candidate position designation unit that accepts, from a user, a candidate position designation that is a candidate for an installation position of the radio wave sensor in the image, and a display control unit that causes a display device to display, superimposed on the image, a radio wave irradiation range of the radio wave sensor that is determined based on the determined target position and the designated candidate position, wherein the candidate position designation unit can accept, from the user, an instruction to move the designated candidate position, and when the candidate position designation unit accepts the instruction to move, the display control unit changes the shape of the radio wave irradiation range in accordance with the movement of the designated candidate position while keeping the target position fixed. This allows the user to visually confirm the change in the shape of the radio wave irradiation range when the candidate position is moved.

[0013] (2) The installation assistance device may include an input device for specifying coordinates in the image, the candidate position specifying unit may accept successive changes in the coordinates specified by the user via the input device as an instruction to move the candidate position, and the display control unit may change the shape of the radio wave irradiation range by real-time processing in accordance with the successive changes in the specified coordinates. This allows the user to confirm the change in the shape of the radio wave irradiation range in real time in accordance with the successive changes in the coordinates.

[0014] (3) The display control unit may cause the display device to display a line or a line segment connecting the target position and the candidate position superimposed on the image and the radio wave irradiation range, thereby allowing a user to visually confirm the reference direction of radio wave irradiation connecting the target position and the candidate position.

[0015] (4) The straight line or the line segment may be an arrow pointing from the candidate position to the target position, thereby allowing the user to visually confirm from where and to where the radio waves are radiated.

[0016] (5) The display control unit may cause the display device to display a planned detection area, which is planned as a detection area for the radio wave sensor to detect an object, superimposed on the image and the radio wave irradiation range, thereby allowing a user to visually confirm the overlap between the planned detection area and the radio wave irradiation range.

[0017] (6) The planned detection area may be divided into a plurality of partial areas, and the display control unit may display each of the plurality of partial areas on the display device by superimposing the partial areas on the image and the radio wave irradiation range, thereby allowing a user to visually confirm the overlap between each partial area and the radio wave irradiation range.

[0018] (7) The display control unit may superimpose on the image a non-illuminated area where radio waves emitted by the radio wave sensor are blocked by an object, and the display control unit may change the shape of the non-illuminated area in response to movement of the designated candidate position, thereby allowing a user to visually confirm a change in the shape of the non-illuminated area when the candidate position is moved.

[0019] (8) The display control unit may control the display device to display a mark indicating an evaluation result of the candidate position as an installation location of the radio wave sensor at the candidate position in the image, thereby allowing a user to visually confirm the evaluation result of the candidate position as an installation location.

[0020] (9) The candidate position designation unit may accept, from the user, designation of an area in the image that includes a plurality of the candidate positions, and the display control unit may cause the display device to display, in the area in the image designated by the user, a plurality of the marks corresponding to the plurality of candidate positions, respectively. This allows the user to visually confirm the evaluation results of each candidate position in the designated area.

[0021] (10) The display control unit may cause the display device to display the mark in a color corresponding to the rank of the candidate location, thereby allowing a user to visually confirm the rank of the candidate location.

[0022] (11) A computer program according to this embodiment is a computer program for assisting a computer in installing a radio wave sensor, and causes the computer to function as: a target position determination unit that determines a target position for radio wave irradiation by the radio wave sensor in an image including a crosswalk; a candidate position designation unit that accepts, from a user, a candidate position designation for a candidate position for installing the radio wave sensor in the image; and a display control unit that causes a display device to display, superimposed on the image, a radio wave irradiation range of the radio wave sensor determined based on the determined target position and the designated candidate position. The candidate position designation unit can accept, from the user, an instruction to move the designated candidate position. When the candidate position designation unit accepts the instruction to move, the display control unit changes the shape of the radio wave irradiation range in accordance with the movement of the designated candidate position while keeping the target position fixed. This allows the user to visually confirm the change in the shape of the radio wave irradiation range when the candidate position is moved.

[0023] (12) A method for determining an installation position of a radio wave sensor according to this embodiment is a method for determining an installation position of the radio wave sensor using an installation support device that supports the installation of the radio wave sensor, the method including the steps of: specifying candidate positions that are candidates for the installation position of the radio wave sensor in an image including a crosswalk displayed on the installation support device, thereby causing the installation support device to display a target position of radio wave irradiation by the radio wave sensor and a radio wave irradiation range of the radio wave sensor determined based on the specified candidate positions, superimposed on the image; and instructing the installation support device to move the specified candidate positions, thereby causing the installation support device to change the shape of the radio wave irradiation range in accordance with the movement of the instructed candidate positions while keeping the target position fixed. This allows a user to visually confirm the change in the shape of the radio wave irradiation range when the candidate positions are moved.

[0024] <Details of the embodiment of the present disclosure> DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. At least some of the following preferred embodiments may be combined in any desired manner.

[0025] [1. Infrastructure radio wave sensor] 1 is a diagram showing an example of use of an infrastructure radio wave sensor according to an embodiment. The infrastructure radio wave sensor 10 according to this embodiment is a radio wave radar for traffic monitoring, and detects pedestrians at a crosswalk 20. The infrastructure radio wave sensor 10 is, for example, a millimeter-wave radar.

[0026] The infrastructure radio wave sensor 10 is attached to a structure 50 installed on a road. The structure 50 is several meters tall, and the infrastructure radio wave sensor 10 is installed several meters above the ground. The structure 50 includes, for example, a pole 51 and an arm 52 installed near the top end of the pole 51, and the infrastructure radio wave sensor 10 is attached to the arm 52.

[0027] The infrastructure radio wave sensor 10 emits radio waves (millimeter waves) onto the crosswalk 20 and receives the reflected waves to detect an object (e.g., a pedestrian or a bicycle) on the crosswalk 20. More specifically, the infrastructure radio wave sensor 10 can detect the distance from the infrastructure radio wave sensor 10 to the object on the crosswalk 20, the speed of the object, and the horizontal angle (azimuth angle) of the object's location relative to the radio wave emission axis.

[0028] The infrastructure radio wave sensor 10 sets a detection area 30, which is a range on the road for detecting objects. The detection area 30 is set as part of the radio wave irradiation range 40 of the infrastructure radio wave sensor 10. In other words, the radio wave irradiation range 40 covers the detection area 30. In order for the infrastructure radio wave sensor 30 to monitor the traffic conditions across the entire crosswalk 20, it is preferable to set a detection area 30 that includes the entire crosswalk 20. Note that the radio wave irradiation range 40 is a range within which an object can reflect the radio waves irradiated by the infrastructure radio wave sensor 10 and the infrastructure radio wave sensor 10 can detect the object based on the reflected waves from the object, and does not include a range within which the infrastructure radio wave sensor 10 cannot detect an object even if it can irradiate radio waves. However, the radio wave irradiation range 40 is not limited to this and may be the entire range within which the infrastructure radio wave sensor 10 can irradiate radio waves.

[0029] The radio wave irradiation range of the infrastructure radio wave sensor 10 described above changes depending on the installation position and angle. Therefore, in order to install a detection area 30 that includes the entire crosswalk 20, the infrastructure radio wave sensor 10 needs to be installed at an appropriate position and angle. In this embodiment, an installation assistance device assists in determining the installation position and angle of the infrastructure radio wave sensor 10 described above.

[0030] [2.Configuration of installation support device] 2 is a block diagram showing an example of the hardware configuration of an installation support device according to this embodiment. The installation support device 100 according to this embodiment is used by a user who determines the installation position and angle of the infrastructure radio wave sensor 10. The installation support device 100 includes a processor 101, a non-volatile memory 102, a volatile memory 103, an input / output interface (I / O) 104, a graphics controller 105, and a communication interface (communication I / F) 106. The installation support device 100 further includes an input device 201, a printer 202, and a display device 203.

[0031] The volatile memory 103 is, for example, a semiconductor memory such as an SRAM (Static Random Access Memory) or a DRAM (Dynamic Random Access Memory). The non-volatile memory 102 is, for example, a flash memory, a hard disk, a ROM (Read Only Memory), etc. The non-volatile memory 102 stores an installation support program 107, which is a computer program, and data used to execute the installation support program 107, such as image data (image files) 108. The installation support device 100 is configured with a computer, and each function of the installation support device 100 is realized by the processor 101 executing the installation support program 107, which is a computer program stored in a storage device of the computer. The installation support program 107 can be stored in a recording medium such as a flash memory, a ROM, or a CD-ROM. The processor 101 uses the installation support program 107 to support the user in determining the installation position and angle of the infrastructure radio wave sensor 10.

[0032] The processor 101 is, for example, a CPU (Central Processing Unit). However, the processor 101 is not limited to a CPU. The processor 101 may also be a GPU (Graphics Processing Unit). The processor 101 may also be, for example, an ASIC (Application Specific Integrated Circuit) or a programmable logic device such as a gate array or FPGA (Field Programmable Gate Array). In this case, the ASIC or programmable logic device is configured to be able to execute processing similar to that of the installation assistance program 107.

[0033] For example, the input device 201 includes a keyboard and a pointing device such as a mouse. The input device 201 may be a capacitive or pressure-sensitive touchpad overlaid on the screen of the display device 203. The input device 201 is used to input data to the installation support device 100. The I / O 104 is connected to the input device 201 and the printer 202. The I / O 104 receives input data from the input device 201 and provides the received data to the processor 101. Furthermore, the I / O 104 outputs a print command and data required for printing, which are provided by the processor 101, to the printer 202. The printer 202 performs printing in accordance with the input print command and data.

[0034] The display device 203 includes, for example, a liquid crystal panel or an OEL (organic electroluminescence) panel. The display device 203 can display character or graphic information. The graphics controller 105 is connected to the display device 203 and controls the display on the display device 203. The graphics controller 105 includes, for example, a GPU and a VRAM (Video RAM), stores data to be displayed on the display device 203 in the VRAM, periodically reads one frame of video data from the VRAM, and generates a video signal. The generated video signal is output to the display device 203, and the video is displayed on the display device 203. The function of the graphics controller 105 may be included in the processor 101. A part of the area of ​​the volatile memory 103 may be used as the VRAM.

[0035] The communication I / F 106 can communicate with an external device. For example, the communication I / F 106 can transmit information including the installation position and angle of the infrastructure radio wave sensor 10 determined using the installation assistance device 100 to a server or a terminal device.

[0036] [3. Functions of the installation support device] 3 is a functional block diagram showing an example of the functions of the installation support device according to this embodiment. When the processor 101 executes the installation support program 107, the installation support device 100 functions as an image input unit 111, a display control unit 112, an area determination unit 113, a target position determination unit 114, a candidate position designation unit 115, a radio wave irradiation range determination unit 116, an obstacle setting unit 117, a non-irradiation range determination unit 118, an evaluation unit 119, a report creation unit 120, and an output unit 121.

[0037] The image input unit 111, area determination unit 113, target position determination unit 114, candidate position designation unit 115, radio wave irradiation range determination unit 116, obstacle setting unit 117, non-irradiation range determination unit 118, evaluation unit 119, and form creation unit 120 are mainly realized by the processor 101. The display control unit 112 is mainly realized by the graphics controller 105. The output unit 121 is mainly realized by the I / O 104.

[0038] The image input unit 111 accepts input of image data 108 including a crosswalk. The display control unit 112 causes the display device 203 to display an installation position determination screen including the input image data 108. The image data 108 is data of an image including a crosswalk, for example, photographic data of a crosswalk. However, the image data 108 is not limited to photographic data, and may be, for example, map data including a crosswalk or drawing data of a crosswalk used for road construction.

[0039] FIG. 4 is a diagram showing an example of an installation position determination screen on which an image including a pedestrian crossing is displayed, and FIG. 5 is an enlarged diagram showing the image displayed on the installation position determination screen in FIG. 4. The installation position determination screen 300 includes a display area 301 for an input image. In the example of FIG. 4, the display area 301 is an area on the left side of the installation position determination screen 300. For example, a button 302 for instructing the reading of an image is provided near the display area 301. The user can display a window (not shown) for selecting image data 108 by performing an operation to select the button 302 on the input device 201. The user can specify the image data 108 to be input by selecting the image data 108 from the window. When the image data 108 is specified by the user, the image input unit 111 accepts the input of the image data 108.

[0040] Returning to FIG. 3, the area determination unit 113 determines the planned detection area 303 based on the displayed image 108A. See FIG. 5. The planned detection area 303 is an area planned as a detection area for the infrastructure radio wave sensor 10 to detect an object. On the installation position determination screen 300, the coordinates of the image 108A are defined in advance. The origin of the coordinates is, for example, the upper left corner of the image 108A, and an X axis extending rightward from the origin and a Y axis extending downward from the origin are defined.

[0041] The installation position determination screen 300 includes a zebra setting section 319 for setting the area of ​​the crosswalk (hereinafter referred to as the "zebra area") 304 in the image 108A. The zebra setting section 319 sets the upper end point of the center of the crosswalk in the left-right direction (upper center of the zebra) 311A, the lower end point of the center of the crosswalk in the left-right direction (lower center of the zebra) 311B, the upper left corner point of the crosswalk (upper left corner of the zebra) 311C, the upper right corner point of the crosswalk (upper right corner of the zebra) 311D, the roadway on the inbound side of the intersection (the roadway on which vehicles travel in the direction of inbound traffic into the intersection; hereinafter referred to as the "inbound roadway") 311D, and the area of ​​the roadway on the inbound side of the intersection (the roadway on which vehicles travel in the direction of inbound traffic into the intersection; hereinafter referred to as the "inbound roadway") 311E. The zebra setting area 319 includes a plurality of input boxes for inputting the coordinate values ​​(X, Y) of the left end point (upper left end of the exit boundary) 311E and the right end point (upper right end of the exit boundary) 311F of the boundary between 10A and the roadway on the exit side of the intersection (the roadway on which the vehicle travels exiting the intersection; hereinafter referred to as the "exit roadway") 310B, the lower left corner point of the crosswalk (lower left edge of the zebra) 311G, and the lower right corner point of the crosswalk (lower right edge of the zebra) 311H. The user can specify the zebra area 304 in image 108A by inputting the coordinate values ​​into each input box in zebra setting area 319 or by clicking and specifying each of the above points on the displayed image 108A. Hereinafter, zebra top center 311A, zebra bottom center 311B, zebra top left edge 311C, zebra top right edge 311D, outflow boundary top left edge 311E, outflow boundary top right edge 311F, zebra bottom left edge 311G, and zebra bottom right edge 311H will be collectively referred to as “area definition points.” Note that area definition points 311 may be detected by installation support device 100 analyzing image 108A.

[0042] The area determination unit 113 determines the zebra area 304 based on the area definition points 311A ​​to 311H. The area determination unit 113 further determines the planned detection area 303 based on the zebra area 304. The area definition points 311A ​​to 311H are points for defining the planned detection area 303.

[0043] The planned detection area 303 is larger than the zebra area 304. Specifically, the planned detection area 303 is an area that is expanded on both the left and right sides of the zebra area 304 and on both the top and bottom sides of the zebra area 304. The areas that are expanded on both the left and right sides of the zebra area 304 are margins for detecting pedestrians or bicycles (hereinafter, "pedestrians" includes bicycles) that are walking slightly off the crosswalk. The areas that are expanded on both the top and bottom sides of the zebra area 304 are waiting areas for pedestrians waiting at traffic lights on sidewalks 312A and 312B.

[0044] For example, the nonvolatile memory 102 of the installation assistance device 100 stores a margin size setting value and a waiting area size setting value. An example of the margin size setting value is the length of the margin in the X direction from the left and right ends of the zebra area 304. An example of the waiting area size setting value is the length of the waiting area in the Y direction from the top and bottom ends of the zebra area 304. The area determination unit 113 can determine the planned detection area 303 by expanding the zebra area 304 in the left and right directions (X direction) by the margin size setting value and expanding the zebra area 304 in the up and down directions (Y direction) by the waiting area size setting value.

[0045] The planned detection area 303 is divided into multiple partial areas. In a specific example, the planned detection area 303 is divided into an on-coming waiting area 303A, an on-coming zebra area 303B, an on-coming zebra area 303C, and an on-coming waiting area 303D. The on-coming waiting area 303A is a part of the sidewalk 312A adjacent to the on-coming roadway 310A, and is an area where pedestrians wait while waiting for the traffic light to change. The on-coming zebra area 303B is a crosswalk area on the on-coming roadway 310A. The on-coming zebra area 303C is a crosswalk area on the on-coming roadway 310B. The on-coming waiting area 303D is a part of the sidewalk 312B adjacent to the on-coming roadway 310B, and is an area where pedestrians wait while waiting for the traffic light to change. The area determination unit 113 can determine each of the incoming side waiting area 303A, the incoming side zebra area 303B, the outgoing side zebra area 303C, and the outgoing side waiting area 303D.

[0046] Display control unit 112 causes entry-side waiting area 303A, entry-side zebra area 303B, exit-side zebra area 303C, and exit-side waiting area 303D to be superimposed on image 108A and displayed on display device 203. In a specific example, display control unit 112 causes entry-side waiting area 303A, entry-side zebra area 303B, exit-side zebra area 303C, and exit-side waiting area 303D to be displayed in a transparent color. This prevents entry-side waiting area 303A, entry-side zebra area 303B, exit-side zebra area 303C, and exit-side waiting area 303D from obscuring the image of the crosswalk included in image 108A, allowing the user to view both entry-side waiting area 303A, entry-side zebra area 303B, exit-side zebra area 303C, and exit-side waiting area 303D and the image of the crosswalk. Therefore, the user can easily confirm the positional relationship between the crosswalk and the entrance side waiting area 303A, the entrance side zebra area 303B, the exit side zebra area 303C, and the exit side waiting area 303D.

[0047] The display control unit 112 can display the incoming side waiting area 303A, the incoming side zebra area 303B, the outgoing side zebra area 303C, and the outgoing side waiting area 303D in different colors. By displaying the areas 303A to 303D in different colors in this way, the user can easily distinguish between the incoming side waiting area 303A, the incoming side zebra area 303B, the outgoing side zebra area 303C, and the outgoing side waiting area 303D.

[0048] Returning to FIG. 3, the target position determination unit 114 determines the target position of radio wave irradiation by the infrastructure radio wave sensor 10 in the image 108A. See FIG. 5. For example, the target position determination unit 114 determines the default target position 305 to be the center point of the upper side of the incoming-side zebra area 303B. For example, the user can specify any point in the image 108A as the target position. The target position determination unit 114 can change the target position 305 to the point specified by the user.

[0049] Returning to FIG. 3, the candidate position designation unit 115 accepts designation from the user of a candidate position in the image 108A that is a candidate for the installation position of the infrastructure radio wave sensor 10. In the example of FIG. 5, it is assumed that the position for installing the infrastructure radio wave sensor 10 is determined on the sidewalk 312B adjacent to the outflow roadway 310B. The user can designate the candidate position by operating the input device 201, for example, by clicking a desired point in the image 108A.

[0050] 3, the radio wave irradiation range determination unit 116 determines the radio wave irradiation range of the infrastructure radio wave sensor 10 based on the target position 305 determined by the target position determination unit 114 and the candidate positions accepted by the candidate position designation unit 115. The installation support device 100 has information for determining the radio wave irradiation range (for example, the beam width from the radio wave transmission surface and the reachable distance of the radio waves). Using the above information, the radio wave irradiation range determination unit 116 determines the radio wave irradiation range, which is a range having a beam width centered on a straight line connecting the candidate position and the target position 305, and which is also a range from the candidate position to the reachable distance of the radio waves.

[0051] The display control unit 112 causes the display device 203 to display the radio wave irradiation range determined by the radio wave irradiation range determination unit 116 superimposed on the image 108A. FIG. 6 is a diagram showing an example of an image including a crosswalk on which the radio wave irradiation range is superimposed. For example, as shown in FIG. 6, the radio wave irradiation range 307 is displayed in a transparent color. This prevents the radio wave irradiation range 307 from obscuring the image of the crosswalk and the planned detection area 303 included in the image 108A, allowing the user to visually recognize the radio wave irradiation range 307, the image of the crosswalk, and the planned detection area 303. Therefore, the user can easily confirm the positional relationships between the radio wave irradiation range 307, the crosswalk, the incoming side waiting area 303A, the incoming side zebra area 303B, the outgoing side zebra area 303C, and the outgoing side waiting area 303D. For example, the user can easily check whether the radio wave irradiation range 307 overlaps the entire planned detection area 303, and if part of the planned detection area 303 is outside the radio wave irradiation range 307, which part of the planned detection area 303 is outside the range and to what extent.

[0052] The display control unit 112 can make the display color of the radio wave irradiation range 307 different from the display colors of the incoming side waiting area 303A, the incoming side zebra area 303B, the outgoing side zebra area 303C, and the outgoing side waiting area 303D, respectively. This allows the user to easily distinguish the radio wave irradiation range 307 from the incoming side waiting area 303A, the incoming side zebra area 303B, the outgoing side zebra area 303C, and the outgoing side waiting area 303D, respectively.

[0053] The display control unit 112 causes the display device 203 to display a straight line or a line segment connecting the target position 305 and the candidate position 306. For example, the straight line or the line segment is an arrow 308 pointing from the candidate position 306 to the target position 305. The display control unit 112 causes the display device 203 to display the arrow 308 superimposed on the image 108, the planned detection area 303, and the radio wave irradiation range 307. This allows the user to easily check the radio wave irradiation direction.

[0054] Returning to FIG. 3 , the obstacle setting unit 117 sets an obstacle that blocks radio waves in association with the image 108A. See FIG. 4 . Traffic light poles 309A and 309B are examples of obstacles that block radio waves. The user inputs the coordinates of the obstacle in the image 108A to the installation support device 100. In the example of FIG. 4 , the installation position determination screen 300 includes an obstacle setting unit 313 for setting the position of the obstacle in the image 108A. The obstacle setting unit 313 includes a plurality of input boxes for inputting coordinate values ​​of definition points of the traffic light poles 309A and 309B, which are obstacles, in the image 108A. The user can set the obstacle in the image 108A by inputting coordinate values ​​in each input box of the obstacle setting unit 313, or by clicking and specifying the definition point of the obstacle in the displayed image 108A.

[0055] Returning to FIG. 3, the non-illuminated area determination unit 118 determines a non-illuminated area in which radio waves emitted by the infrastructure radio wave sensor 10 are blocked by obstacles (traffic light poles 309A and 309B). The display control unit 112 causes the display device 203 to display the non-illuminated area determined by the non-illuminated area determination unit 118 superimposed on the image 108A. See FIG. 6. The non-illuminated area is formed on the opposite side of the obstacle from the candidate position 306. A non-illuminated area 314A is formed on the opposite side of the candidate position 306 for the traffic light pole 309A. A non-illuminated area 314B is formed on the opposite side of the candidate position 306 for the traffic light pole 309B. The non-illuminated area 314A is an area extending from the traffic light pole 309A in the opposite direction to the candidate position 306, and has a width corresponding to the size of the traffic light pole 309A. Non-illuminated area 314B is an area extending from traffic light pole 309B in the opposite direction to candidate position 306, and has a width according to the size of traffic light pole 309B.

[0056] The display control unit 112 can make the display color of the non-irradiated areas 314A and 314B different from the display colors of the incoming-side waiting area 303A, the incoming-side zebra area 303B, the outgoing-side zebra area 303C, the outgoing-side waiting area 303D, and the radio wave irradiation area 307. This allows the user to easily distinguish the non-irradiated areas 314A and 314B from the incoming-side waiting area 303A, the incoming-side zebra area 303B, the outgoing-side zebra area 303C, the outgoing-side waiting area 303D, and the radio wave irradiation area 307.

[0057] 3, the evaluation unit 119 evaluates the candidate position 306 designated by the user based on the radio wave irradiation range 307 and the planned detection area 303 in the image 108A. In a specific example, the evaluation unit 119 calculates a coverage ratio, which is the proportion of the planned detection area 303 that overlaps with the radio wave irradiation range 307. The evaluation unit 119 evaluates the candidate position 306 based on the calculated coverage ratio.

[0058] The evaluation unit 119 can determine the rank of the candidate location 306 based on a comparison between the coverage rate and a threshold. In a more specific example, the evaluation unit 119 calculates the coverage rate for each of the incoming side waiting area 303A, the incoming side zebra area 303B, the outgoing side zebra area 303C, and the outgoing side waiting area 303D included in the scheduled detection area 303. The evaluation unit 119 determines the rank of the candidate location 306 based on the coverage rate for each of the incoming side waiting area 303A, the incoming side zebra area 303B, the outgoing side zebra area 303C, and the outgoing side waiting area 303D.

[0059] Hereinafter, the incoming-side waiting area 303A, the incoming-side zebra area 303B, the outgoing-side zebra area 303C, and the outgoing-side waiting area 303D are collectively referred to as "partial areas." The evaluation unit 119 uses, for example, a first threshold value for the partial areas. The evaluation unit 119 calculates a coverage rate (hereinafter referred to as a "partial coverage rate") for each partial area, which is the proportion of the portion of the partial area that overlaps with the radio wave irradiation range 307. The evaluation unit 119 compares each partial coverage rate with the first threshold value and determines whether the partial coverage rate is equal to or greater than the first threshold value. The evaluation unit 119 can determine the rank of the candidate location 306 depending on whether there is a partial area whose partial coverage rate is less than the first threshold value.

[0060] The evaluation unit 119 can further use a second threshold value for the planned detection area. For example, the evaluation unit 119 calculates a coverage rate (hereinafter referred to as "total coverage rate"), which is the proportion of the planned detection area that overlaps with the radio wave irradiation range 307. The evaluation unit 119 compares the total coverage rate with the second threshold value and determines whether the total coverage rate is equal to or greater than the second threshold value. The evaluation unit 119 can determine the rank of the candidate location 306 depending on whether the total coverage rate is less than the second threshold value.

[0061] The evaluation unit 119 can evaluate the candidate position 306 further based on the non-irradiated areas 314A and 314B. For example, in calculating the partial coverage rate, the evaluation unit 119 can exclude the overlapping portion of the partial area and the non-irradiated areas 314A and 314B from the overlapping portion of the partial area and the radio wave irradiation range 307. More specifically, when the non-irradiated areas 314A and 314B overlap the radio wave irradiation range 307, the evaluation unit 119 can exclude the overlapping portion of the partial area and the non-irradiated areas 314A and 314B from the overlapping portion of the partial area and the radio wave irradiation range 307. For example, in calculating the total coverage rate, the evaluation unit 119 can exclude the overlapping portion of the planned detection area 303 and the non-irradiated areas 314A and 314B from the overlapping portion of the planned detection area 303 and the radio wave irradiation range 307. More specifically, when the radio wave irradiation range 307 overlaps with the non-irradiation ranges 314A and 314B, the evaluation unit 119 can exclude the overlapping portion of the planned detection area 303 and the non-irradiation ranges 314A and 314B from the overlapping portion of the planned detection area 303 and the radio wave irradiation range 307.

[0062] The evaluation unit 119 can determine the rank of the candidate location 306 further based on the positional relationship between the candidate location 306 and the planned detection area 303. For example, a recommended range, a semi-recommended range, and a non-recommended range are defined based on the planned detection area 303 and the zebra area 304. The evaluation unit 119 can determine the rank of the candidate location 306 depending on whether the candidate location 306 is in the recommended range, semi-recommended range, or non-recommended range.

[0063] 7A to 7E are diagrams for explaining examples of ranks. In the examples of Fig. 7A to 7E, the evaluation unit 119 assigns the candidate position 306 to one of five ranks A to E.

[0064] It is estimated that the smaller the angle between the radio wave emission direction of the infrastructure radio wave sensor 10 and the direction of travel of the pedestrian on the crosswalk, i.e., the longitudinal direction of the crosswalk (the Y-axis direction in FIG. 3), the better the detection accuracy. Therefore, on the sidewalk where the infrastructure radio wave sensor 10 is installed (sidewalk 312B adjacent to the outbound roadway 310B in the example of FIG. 5), the area obtained by extending the zebra area 304 in the longitudinal direction is set as the recommended range 315A for installing the infrastructure radio wave sensor 10. On the sidewalk where the infrastructure radio wave sensor 10 is installed, the area obtained by extending the area inside the planned detection area 303 in the width direction and outside the zebra area 304 in the width direction (the margin area extended left and right from the zebra area 304) in the longitudinal direction is set as the semi-recommended range 315B. The semi-recommended range 315B is the range where installation of the infrastructure radio wave sensor 10 is next recommended after the recommended range 315A. The area excluding the recommended range 315A and the semi-recommended range 315B is set as the non-recommended range 315C. The non-recommended range 315C is a range in which installation of the infrastructure radio wave sensor 10 is not recommended.

[0065] For example, if the partial coverage rates for all partial areas are equal to or greater than the first threshold, and the candidate location 306 is within the recommended range 315A, the candidate location 306 is determined to be ranked A, which is the highest rank (FIG. 7A).

[0066] For example, when the partial coverage rate for all partial areas is equal to or greater than the first threshold, and the candidate location 306 is within the semi-recommended range 315B, the candidate location 306 is determined to be the second rank, rank B (FIG. 7B).

[0067] For example, when the partial coverage rates for all partial areas are equal to or greater than the first threshold, if the candidate location 306 is within the unrecommended range 315C, the candidate location 306 is determined to be ranked C, which is the third rank (FIG. 7C).

[0068] For example, if the partial coverage rate for at least one partial area is less than the first threshold and the total coverage rate is equal to or greater than the second threshold, the candidate location 306 is determined to be ranked D, which is the fourth rank (FIG. 7D).

[0069] For example, if the partial coverage rate for at least one partial area is less than a first threshold and the total coverage rate is less than a second threshold, the candidate location 306 is determined to be the lowest rank, rank E (FIG. 7E).

[0070] Returning to FIG. 3, the display control unit 112 causes the display device 203 to display a mark indicating the evaluation result of the candidate location 306 as an installation location for the infrastructure radio wave sensor 10 at the candidate location in the image 108A. For example, a different mark for each rank is displayed at the candidate location 306. In a specific example, the color of the mark varies depending on the rank. For example, the color of the mark for rank A is blue, the color of the mark for rank B is green, the color of the mark for rank C is yellow, the color of the mark for rank D is orange, and the color of the mark for rank E is red. Note that the shape of the mark may differ depending on the rank.

[0071] The display control unit 112 causes the display device 203 to display the evaluation result of the candidate position 306 on the installation position determination screen. Fig. 8 is a diagram showing an example of the installation position determination screen on which the evaluation result of one candidate position is displayed. When the evaluation result of the candidate position by the evaluation unit 119 is obtained, the installation position determination screen 300 transitions to a screen 300A including an evaluation result display unit 317. The evaluation result display unit 317 includes numerical values ​​for the coordinates (X coordinate, Y coordinate) of the candidate position, the horizontal angle (the angle between the radio wave irradiation direction and the longitudinal direction of the zebra area 304), the rank ("priority rank" in FIG. 8), the overall coverage rate ("overall" in FIG. 8), the partial coverage rate in the incoming side waiting area 303A ("incoming waiting" in FIG. 8), the partial coverage rate in the incoming side zebra area 303B ("incoming" in FIG. 8), the partial coverage rate in the outgoing side zebra area 303C ("outgoing" in FIG. 8), and the partial coverage rate in the outgoing side waiting area 303D ("outgoing waiting" in FIG. 8).

[0072] 3 , the candidate position designation unit 115 accepts continuous changes in the coordinates of the candidate position 306 designated by the user via the input device 201 as an instruction to move the candidate position 306. The display control unit 112 fixes the target position 305 and changes the shape of the radio wave irradiation range 307 in accordance with the movement of the candidate position 306 designated by the user. More specifically, the display control unit 112 changes the shape of the radio wave irradiation range 307 by real-time processing in accordance with the continuous changes in the designated coordinates.

[0073] The display control unit 112 changes the shapes of the non-illuminated areas 314A and 314B in accordance with the movement of the candidate position 306 designated by the user. More specifically, the display control unit 112 changes the shapes of the non-illuminated areas 314A and 314B by real-time processing in accordance with continuous changes in the designated coordinates.

[0074] 9 is a diagram showing an example of the transition of the radio wave irradiation range in response to continuous changes in the coordinates of a candidate position. The user can continuously change the coordinates of a candidate position 306 by operating the input device 201, for example by dragging and dropping. The candidate position designation unit 115 accepts such a user instruction to move the candidate position 306. The radio wave irradiation range determination unit 116 fixes the target position 305 and determines the radio wave irradiation range 307 for each changing candidate position 306. The display control unit 112 displays the radio wave irradiation range 307 determined by the radio wave irradiation range determination unit 116 by real-time processing.

[0075] When candidate position 306A moves to candidate position 306B, radio wave irradiation range 307A transitions to radio wave irradiation range 307B. Furthermore, as the coordinates of candidate position 306 change, arrow 308 connecting candidate position 306 and target position 305 changes in real time. That is, as candidate position 306A transitions to candidate position 306B, arrow 308A transitions to arrow 308B. In this way, radio wave irradiation range 307 changes through real-time processing, so the user can check the overlap between planned detection area 303 and radio wave irradiation range 307 while moving candidate position 306. As a result, the user can easily find a candidate position that forms radio wave irradiation range 307 that overlaps a large area with planned detection area 303.

[0076] The non-irradiation area determination unit 118 determines non-irradiation areas 314A and 314B for each changing candidate position 306. The display control unit 112 displays the non-irradiation areas 314A and 314B determined by the non-irradiation area determination unit 118 by real-time processing.

[0077] When candidate position 306A moves to candidate position 306B, non-illuminated area 314AA transitions to non-illuminated area 314AB, and non-illuminated area 314BA transitions to non-illuminated area 314BB. Non-illuminated areas 314AA and 314AB are areas where radio waves are blocked by traffic light pole 309A, and non-illuminated areas 314BA and 314BB are areas where radio waves are blocked by traffic light pole 309B.

[0078] 3, the candidate position designation unit 115 can accept designation from the user of an area including multiple candidate positions 306 in the image 108A. The radio wave irradiation range determination unit 116 determines a radio wave irradiation range 307 for each candidate position 306 included in the designated area. The non-irradiation range determination unit 118 determines non-irradiation ranges 314A and 314B for each candidate position 306 included in the designated area.

[0079] The evaluation unit 119 evaluates each candidate position 306 included in the specified area based on the radio wave irradiation range 307, the non-irradiation ranges 314A and 314B, and the planned detection area 303. In a specific example, the evaluation unit 119 determines a rank for each candidate position 306 included in the specified area. The display control unit 112 causes the display device 203 to display a plurality of marks corresponding to each of the plurality of candidate positions 306 in the area specified by the user in the image 108A.

[0080] 10 is a diagram showing an example of an installation position determination screen when an area including multiple candidate positions is specified. The user can operate the input device 201 to specify an area (hereinafter referred to as a "candidate area") 318 including multiple candidate positions 306, for example, by dragging and dropping. The candidate area 318 is, for example, a rectangular area. The candidate area 318 is a collection of multiple unit areas, and each unit area is a candidate position 306. The unit area is, for example, a rectangular area.

[0081] The evaluation results of each candidate location 306 included in candidate area 318 are displayed in candidate area 318. That is, marks indicating the rank of each candidate location 306 are displayed side by side in candidate area 318. Therefore, by checking the marks included in candidate area 318, the user can check the rank of each candidate location 306 included in candidate area 318 all at once.

[0082] When a candidate area 318 is specified, a radio wave irradiation range 307 and non-irradiation ranges 314A and 314B corresponding to each candidate position 306 are determined. When a candidate area 318 is specified, the radio wave irradiation range 307 and non-irradiation ranges 314A and 314B are not displayed on the image 108A. This makes it possible to avoid the complication of displaying multiple radio wave irradiation ranges 307 and non-irradiation ranges 314A and 314B.

[0083] The display control unit 112 causes the display device 203 to display the evaluation results of the multiple candidate locations 306 on an installation location determination screen. Fig. 11 is a diagram showing an example of the installation location determination screen on which the evaluation results of the multiple candidate locations are displayed. When the evaluation results of each candidate location 306 included in the candidate area 318 are obtained, an installation location determination screen 300B is displayed, which includes an evaluation result display unit 317 showing the evaluation results of the multiple candidate locations 306. The evaluation result display unit 317 displays a list of the evaluation results of the multiple candidate locations 306 included in the candidate area 318. The display items in the evaluation result display unit 317 are the same as the display items in the evaluation result display unit 317 shown in Fig. 8.

[0084] The user can determine one of the candidate positions 306 as the installation location of the infrastructure radio wave sensor 10, taking into consideration the evaluation result of the candidate positions 306 described above. Returning to FIG. 3 , the form creation unit 120 creates a form for installing the infrastructure radio wave sensor 10 at the candidate position 306, based on the target position 305 determined by the target position determination unit 114 and the candidate position 306 accepted by the candidate position designation unit 115. The output unit 121 outputs the form created by the form creation unit 120. In a specific example, the output unit 121 outputs printing data for the form to the printer 202, and the printer 202 prints the form. The output unit 121 may display the form on the display device 203.

[0085] 12 is a diagram showing an example of a form. Form 320 includes information used to install infrastructure radio wave sensor 10 at candidate position 306 (hereinafter referred to as "installation position 322") determined as the installation position of infrastructure radio wave sensor 10. Form 320 includes image 108A including a crosswalk. Image 108A shows first reference point 321A, second reference point 321B, third reference point 321C, and installation position 322. First reference point 321A and second reference point 321B are information for specifying installation position 322. Third reference point 321C is information for specifying target position 305.

[0086] Returning to FIG. 4, installation position determination screen 300 includes reference point setting section 323. Reference point setting section 323 is an area for the user to set first reference point 321A and second reference point 321B. Reference point setting section 323 includes a plurality of input boxes for inputting coordinate values ​​of first reference point 321A and second reference point 321B. The user can specify first reference point 321A and second reference point 321B in image 108A by inputting coordinate values ​​in each input box of reference point setting section 323, or by clicking and specifying any point on displayed image 108A.

[0087] The first reference point 321A and the second reference point 321B are points that serve as landmarks for identifying the installation position on-site. For this reason, it is preferable that the first reference point 321A and the second reference point 321B be points that can be easily recognized by workers on-site. In the example of FIG. 11, the first reference point 321A and the second reference point 321B are the zebra's lower left edge 311G and the zebra's lower right edge 311H. The installation support device 100 can set, for example, two points from the zebra's upper left edge 311C, the zebra's upper right edge 311D, the outflow boundary's upper left edge 311E, the outflow boundary's upper right edge 311F, the zebra's lower left edge 311G, and the zebra's lower right edge 311H (see FIG. 5) as default values ​​for the first reference point 321A and the second reference point 321B.

[0088] Installation support device 100 may be able to accept designation of third reference point 321C in image 108A from the user. For example, reference point setting unit 323 may include input boxes for inputting coordinate values ​​of third reference point 321C. The user may be able to designate third reference point 321C in image 108A by inputting coordinate values ​​in each input box of reference point setting unit 323, or by clicking and designating an arbitrary point in displayed image 108A.

[0089] The third reference point 321C is a point that serves as a landmark for identifying the target position 305 on-site. For this reason, it is preferable that the third reference point 321C is a point that can be easily recognized by a worker on-site. In the example of FIG. 11, the third reference point 321C is the upper left corner 311C of the zebra. The installation support device 100 can set, for example, one of the upper left corner 311C of the zebra or the upper right corner 311D of the zebra as the default value of the third reference point 321C.

[0090] Returning to FIG. 12 , the form 320 includes distance information 324A from the first reference point 321A to the installation position 322 and distance information 324B from the second reference point 321B to the installation position 322. The distances between the first reference point 321A and the second reference point 321B and the installation position 322 are calculated based on a preset scale of the image 108A. The distance information 324A includes information on a reference distance and an allowable margin. In the example of FIG. 12 , the distance information 324A is 7.8 m ± 1 m, meaning the reference distance is 7.8 m and the margin is ±1 m. The distance information 324B is 8.6 m ± 1 m, meaning the reference distance is 8.6 m and the margin is ±1 m. A worker can measure the actual distances from the first reference point 321A and the second reference point 321B on-site and identify the installation position 322.

[0091] The form 320 includes guidance information 325 that provides guidance on how to identify the installation position 322 from the first reference point 321A and the second reference point 321B. The guidance information 325 allows the worker to understand how to identify the installation position 322 from the first reference point 321A and the second reference point 321B.

[0092] The form 320 includes distance information 324C from the third reference point 321C to the target position 305. The distance between the third reference point 321C and the target position 305 is calculated based on the scale of the image 108A. In the example of FIG. 12, the distance information 324C is 3.5 m. The worker can measure the actual distance from the third reference point 321C at the site and identify the target position 305.

[0093] The form 320 includes guidance information 326 that provides guidance on how to set the angle of the infrastructure radio wave sensor 10. In the example of Fig. 12, the guidance information 326 explains how to align the center of the radio wave emission direction with the target position 305 using a sight fixed to the housing of the infrastructure radio wave sensor 10. The guidance information 326 allows the worker to understand how to set the angle of the infrastructure radio wave sensor 10.

[0094] The following describes a method in which an operator installs the infrastructure radio wave sensor 10 using the form 320. The operator identifies the first reference point 321A and the second reference point 321B specified in the form 320 at the crosswalk site. The operator measures the distance from the first reference point 321A and the second reference point 321B, and identifies as the installation position 322 the position where the distance from the first reference point 321A matches the distance information 324A and the distance from the second reference point 321B matches the distance information 324B.

[0095] The worker adjusts the position or angle of the structure 50 as necessary, and attaches the infrastructure radio wave sensor 10 to the structure 50 so that the infrastructure radio wave sensor 10 is located at the installation position 322. At this time, the worker can adjust the installation position of the infrastructure radio wave sensor 10 within the margin specified in the form 320.

[0096] The worker identifies third reference point 321C specified in form 320 at the crosswalk site. The worker measures the distance from third reference point 321C and identifies the position where the distance from third reference point 321C matches distance information 324C as target position 305. The worker uses a sight (not shown) attached to infrastructure radio wave sensor 10 to adjust the angle of infrastructure radio wave sensor 10 so that it is aimed at target position 305. This completes the installation of infrastructure radio wave sensor 10.

[0097] [4. Operation of the installation support device] By starting the installation support program 107 using the processor 101, the installation support device 100 can execute the image input processing, planned detection area determination processing, obstacle setting processing, first installation position determination support processing, second installation position determination support processing, and report output processing described below.

[0098] 13 is a flowchart showing an example of the procedure for image input processing. Processor 101 causes display device 203 to display installation position determination screen 300 (step S101). The user can specify image data 108 to be input by operating input device 201 to select button 302 (see FIG. 4). Processor 101 accepts input of image data 108 (image 108A) (step S102). Processor 101 causes display device 203 to display input image 108A in display area 301 of installation position determination screen 300 (step S103). This completes the image input processing.

[0099] 14 is a flowchart showing an example of the procedure for the planned detection area determination process. The user can input area definition points 311A-311H by inputting coordinate values ​​into each input box of zebra setting unit 319, or by clicking and specifying a point on displayed image 108A. Processor 101 accepts input of area definition points 311A-311H that define zebra area 304 (step S201).

[0100] Processor 101 determines zebra area 304 (see FIG. 5) based on input area definition points 311A-311H (step S202). Processor 101 determines planned detection area 303, as well as incoming side waiting area 303A, incoming side zebra area 303B, outgoing side zebra area 303C, and outgoing side waiting area 303D based on determined zebra area 304 (step S203).

[0101] The processor 101 superimposes the determined partial areas, namely, the incoming side waiting area 303A, the incoming side zebra area 303B, the outgoing side zebra area 303C, and the outgoing side waiting area 303D, on the image 108A and displays them on the display device 203 (step S204).

[0102] The processor 101 determines the target position 305 of the radio wave irradiation based on the determined partial area or on an input from the user, for example (step S205). This completes the planned detection area determination process.

[0103] 15 is a flowchart showing an example of the procedure for obstacle setting processing. The user can input an obstacle definition point to installation support device 100 by inputting coordinate values ​​into each input box of obstacle setting unit 313, or by clicking and specifying the obstacle definition point in displayed image 108A. Processor 101 accepts input of an obstacle definition point (step S301). Processor 101 sets an obstacle for radio wave irradiation based on the input definition point (step S302). This completes the obstacle setting processing.

[0104] 16 is a flowchart showing an example of the procedure of the first installation position determination support process. The user can specify a candidate position 306 by operating the input device 201 and clicking a desired point on the image 108A, for example. The processor 101 accepts the specification of the candidate position 306 from the user (step S401).

[0105] The processor 101 determines the radio wave irradiation range 307 based on the specified candidate position 306 and the target position 305 (step S402). Furthermore, the processor 101 determines the non-irradiation ranges 314A and 314B based on the specified candidate position 306 and the set obstacles (traffic light poles 309A and 309B) (step S403).

[0106] The processor 101 causes the display device 203 to display an arrow 308 pointing from the candidate position 306 to the target position 305, superimposed on the image 108A (step S404). Furthermore, the processor 101 causes the display device 203 to display the determined radio wave irradiation range 307 and non-irradiation ranges 314A and 314B, superimposed on the image 108A (step S405).

[0107] The processor 101 executes an evaluation process for evaluating the candidate positions 306 (step S406). Fig. 17 is a flowchart showing an example of the procedure of the evaluation process.

[0108] The processor 101 calculates the coverage rate (overall coverage rate) of the radio wave irradiation range 307 in the entire planned detection area 303, and calculates the coverage rate (partial coverage rate) of the radio wave irradiation range 307 in each partial area (step S501).

[0109] The processor 101 determines whether there is a partial area whose partial cover rate is less than the first threshold value (step S502).

[0110] If there is a partial area whose partial coverage rate is less than the first threshold (YES in step S502), the processor 101 determines whether or not the total coverage rate is less than the second threshold (step S503).

[0111] If the total coverage rate is less than the second threshold (YES in step S503), the processor 101 determines the rank of the candidate location 306 to be "E" (step S504).

[0112] If the total coverage rate is equal to or greater than the second threshold (NO in step S503), the processor 101 determines the rank of the candidate location 306 to be "D" (step S505).

[0113] If the partial coverage rates of all partial areas are greater than or equal to the first threshold (NO in step S502), the processor 101 determines whether the candidate location 306 falls outside the recommended range 315A and the semi-recommended range 315B, i.e., whether the candidate location 306 falls within the non-recommended range 315C (step S506).

[0114] If the candidate location 306 falls within the non-recommended range 315C (YES in step S506), the processor 101 determines the rank of the candidate location 306 to be "C" (step S507).

[0115] If the candidate location 306 falls within the recommended range 315A or the semi-recommended range 315B (NO in step S506), the processor 101 determines whether the candidate location 306 falls within the semi-recommended range 315B (step S508).

[0116] If candidate location 306 falls within semi-recommended range 315B (YES in step S508), processor 101 determines the rank of candidate location 306 to be "B" (step S509).

[0117] If candidate location 306 is outside semi-recommended range 315B, that is, if candidate location 306 is within recommended range 315A (NO in step S508), processor 101 determines the rank of candidate location 306 to be "A" (step S510). This completes the evaluation process.

[0118] 16, processor 101 causes display device 203 to display a mark corresponding to the rank of the evaluation result at candidate position 306 of image 108A (step S407). Processor 101 causes display device 203 to display information such as the coordinate values ​​and rank of candidate position 306 in evaluation result display section 317 of installation position determination screen 300A.

[0119] The user can input an instruction to move the candidate position 306 to the installation support device 100 by operating the input device 201. The processor 101 determines whether or not an instruction to move the candidate position 306 has been accepted from the user (step S408). If an instruction to move the candidate position 306 has been accepted from the user (YES in step S408), the processor 101 returns to step S402. As a result, the display of the radio wave irradiation range 307 and the non-irradiation ranges 314A and 314B is updated, and the rank of the new candidate position 306 is determined.

[0120] If the user has not given the installation support device 100 an instruction to move the candidate position 306 (NO in step S408), the first installation position determination support process ends.

[0121] 18 is a flowchart showing an example of the procedure of the second installation position determination support process. The user can operate the input device 201 to specify a desired range in the image 108A by dragging and dropping, thereby specifying the candidate area 318. The processor 101 accepts the specification of the candidate area 318 from the user (step S601).

[0122] The processor 101 selects one position (candidate position 306) in the specified candidate area 318 (step S602).

[0123] The processor 101 determines the radio wave irradiation range 307 based on the selected candidate position 306 and the target position 305 (step S603). Furthermore, the processor 101 determines the non-irradiation ranges 314A and 314B based on the selected candidate position 306 and the set obstacles (traffic light poles 309A and 309B) (step S604).

[0124] The processor 101 executes the evaluation process described above (step S605).

[0125] Processor 101 determines whether all positions in candidate area 318 have been selected (step S606). If unselected positions remain (NO in step S606), processor 101 returns to step S602 and selects one of the unselected positions (step S602). Processor 101 executes the processes from step S603 onwards.

[0126] If all positions within candidate area 318 have been selected (YES in step S606), processor 101 causes display device 203 to display a mark corresponding to the rank of the evaluation result at each position within candidate area 318 on image 108A (step S607). Processor 101 causes display device 203 to display a list of information such as the coordinate values ​​and rank of each candidate position 306 in evaluation result display section 317 of installation position determination screen 300B. This completes the second installation position determination support process.

[0127] 19 is a flowchart showing an example of the procedure for a form output process. After the evaluation result of the candidate position 306 is output, the user can input an instruction to create a form to the installation support device 100. Upon receiving the instruction to create a form from the user, the processor 101 calculates the distance between each of the first reference point 321A and the second reference point 321B and the installation position 322 based on the distance between each of the first reference point 321A and the second reference point 321B and the installation position 322 on the image 108A and the scale of the image 108A (step S701).

[0128] The processor 101 calculates the distance between the third reference point 321C and the target position 305 based on the distance between the third reference point 321C and the target position 305 on the image 108A and the scale of the image 108A (step S702).

[0129] Processor 101 creates form 320 using installation position 322, first reference point 321A, second reference point 321B, third reference point 321C, the calculated distances between installation position 322 and first reference point 321A and second reference point 321B, and the distance between third reference point 321C and target position 305 (step S703). Processor 101 displays created form 320 on display device 203 (step S704).

[0130] The user can input a print instruction for the displayed form 320 to the installation support device 100. The processor 101 determines whether or not a print instruction for the form 320 has been received from the user (step S705).

[0131] If an instruction to print the form 320 is received (YES in step S705), the processor 101 outputs a print command for the form and data for printing to the printer 202, and causes the printer 202 to print the form (step S706). After causing the printer 202 to print the form 320, or if an instruction to print the form 320 is not received from the user, the processor 101 ends the form output process without causing the printer 202 to print the form 320.

[0132] [5. Modifications] In the above-described embodiment, the installation support device 100 evaluates the candidate location 306 based on the overlap between the radio wave irradiation range 307 and the planned detection area 303. However, this is not limiting. For example, the installation support device 100 may evaluate the candidate location 306 based on the overlap between the radio wave irradiation range 307 and the zebra area 304.

[0133] [6. Effects] The installation assistance device 100 includes a target position determination unit 114, a candidate position designation unit 115, and a display control unit 112. The target position determination unit 114 determines a target position 305 of radio wave irradiation by the infrastructure radio wave sensor 100 in an image 108A that includes a crosswalk. The candidate position designation unit 115 accepts designation from a user of a candidate position 306 in the image 108A that is a candidate for an installation position of the infrastructure radio wave sensor 100. The display control unit 112 causes the display device 203 to display a radio wave irradiation range 307 of the infrastructure radio wave sensor 100, which is determined based on the determined target position 305 and the designated candidate position 306, superimposed on the image 108A. The candidate position designation unit 115 can accept an instruction from the user to move the designated candidate position 306. When the candidate position designation unit 115 receives an instruction to move the candidate position 306, the display control unit 112 changes the shape of the radio wave irradiation range 307 in accordance with the movement of the designated candidate position 306, while keeping the target position 305 fixed. This allows the user to visually confirm the change in the shape of the radio wave irradiation range 307 when the candidate position 306 is moved.

[0134] The installation support device 100 may include an input device 201. The input device 201 is used to specify coordinates in the image 108A. The candidate position specification unit 115 may accept continuous changes in the coordinates specified by the user via the input device 201 as an instruction to move the candidate position 306. The display control unit 112 may change the shape of the radio wave irradiation range 307 by real-time processing in accordance with the continuous changes in the specified coordinates. This allows the user to confirm the change in the shape of the radio wave irradiation range 307 in real time in accordance with the continuous changes in the coordinates in the image 108A.

[0135] The display control unit 112 may superimpose a straight line or a line segment connecting the target position 305 and the candidate position 306 on the image 108A and the radio wave irradiation range 307 and display it on the display device 203. This allows the user to visually confirm the reference direction of radio wave irradiation connecting the target position 305 and the candidate position 306.

[0136] The straight line or line segment may be an arrow 308 pointing from the candidate position 306 to the target position 305. This allows the user to visually confirm from where and to where the radio waves are emitted.

[0137] The display control unit 112 may superimpose a planned detection area 303, which is planned as the detection area 30 for the infrastructure radio wave sensor 10 to detect an object, on the image 108A and the radio wave irradiation range 307 and display it on the display device 203. This allows the user to visually confirm the overlap between the planned detection area 303 and the radio wave irradiation range 307.

[0138] The scheduled detection area 303 may be divided into a plurality of partial areas 303A to 303D. The display control unit 112 may superimpose each of the plurality of partial areas 303A to 303D on the image 108A and the radio wave irradiation range 307 and display them on the display device 203. This allows the user to visually confirm the overlap between each of the partial areas 303A to 303D and the radio wave irradiation range 307.

[0139] The display control unit 112 may superimpose non-irradiated areas 314A and 314B, in which radio waves emitted by the infrastructure radio wave sensor 10 are blocked by an object, on the image 108A. The display control unit 112 may change the shapes of the non-irradiated areas 314A and 314B in accordance with movement of the designated candidate position 306. This allows the user to visually confirm the change in the shapes of the non-irradiated areas 314A and 314B when the candidate position 306 is moved.

[0140] The display control unit 112 may control the display device 203 to display, at the candidate position 306 in the image 108A, a mark indicating the evaluation result of the candidate position 306 as an installation position for the infrastructure radio wave sensor 10. This allows the user to visually confirm the evaluation result of the candidate position 306 as an installation position.

[0141] The candidate position designation unit 115 may accept designation from the user of a candidate area 318 in the image 108A that includes multiple candidate positions 306. The display control unit 112 may cause the display device 203 to display multiple marks corresponding to each of the multiple candidate positions 306 in the candidate area 318 in the image 108A designated by the user. This allows the user to visually confirm the evaluation results of each candidate position 306 in the designated candidate area 318.

[0142] The display control unit 112 may cause the display device 203 to display a mark in a color according to the rank of the candidate location 306. This allows the user to visually confirm the rank of the candidate location 306.

[0143] The method for determining an installation position of the infrastructure radio wave sensor 10 is a method for determining an installation position of the infrastructure radio wave sensor 10 using an installation support device 100 that supports installation of the infrastructure radio wave sensor 10. The method for determining an installation position of the infrastructure radio wave sensor 10 includes a step of specifying a candidate position 306 that is a candidate for the installation position of the infrastructure radio wave sensor 10 in an image 108A including a crosswalk displayed on the installation support device 100, thereby causing the installation support device 100 to display a radio wave irradiation range 307 of the infrastructure radio wave sensor 10 superimposed on the image 108A. The radio wave irradiation range 307 is determined based on a target position 305 of radio wave irradiation by the infrastructure radio wave sensor 10 and the specified candidate position 306. The method for determining an installation position of the infrastructure radio wave sensor 10 further includes a step of instructing the installation support device 100 to move the specified candidate position 306, thereby causing the installation support device 100 to change the shape of the radio wave irradiation range 307 in accordance with the movement of the specified candidate position 306 while keeping the target position 305 fixed. This allows the user to visually confirm the change in the shape of the radio wave irradiation range 307 when the candidate position 306 is moved.

[0144] [7. Supplementary Notes] The embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is defined by the claims rather than the above-described embodiments, and includes meanings equivalent to the claims and all modifications within the scope thereof. [Explanation of symbols]

[0145] 10 Infrastructure radio wave sensor (radio wave sensor) 20 Crosswalk 30 detection area 40 Radio wave irradiation range 50 Structures 51 Paul 52 Arm 100 Installation support equipment 101 processors 102 Non-volatile memory 103 Volatile Memory 104 Input / Output Interface (I / O) 105 Graphics Controller 106 Communication Interface (Communication I / F) 107 Installation Support Program 108 Image Data 108A Image 111 Image input unit 112 Display control unit 113 Area Determination Unit 114 Target position determination section 115 Candidate position specification section 116 Radio wave irradiation range determination unit 117 Obstacle setting section 118 Non-irradiation range determination unit 119 Evaluation Department 120 Report Creation Department 121 Output section 201 Input Device 202 Printer 203 Display device 300,300A,300B installation position determination screen 301 Display Area 302 Button 303 Planned detection area 303A Inlet waiting area 303B Inlet Zebra Area 303C Outlet Zebra Area 303D Outflow waiting area 304 Zebra Area 305 Target position 306,306A,306B candidate position 307, 307A, 307B Radio wave irradiation range 308, 308A, 308B Arrows 309A, 309B traffic light pole 310A Inlet roadway 310B Outflow roadway 311A Zebra top center (area definition point) 311B Zebra center bottom (area definition point) 311C Zebra top left corner (area definition point) 311D Zebra top right corner (area definition point) 311E Upper left edge of outflow boundary (area definition point) 311F Upper right edge of outflow boundary (area definition point) 311G Zebra bottom left (area definition point) 311H Zebra bottom right (area definition point) 312A, 312B Sidewalk 313 Obstacle Setting Section 314A, 314B, 314AA, 314AB, 314BA, 314BB Non-illuminated area 315A Recommended Range 315B semi-recommended range 315C Non-recommended range 317 Evaluation result display section 318 candidate areas 319 Zebra Settings 320 Reports 321A 1st reference point 321B 2nd reference point 321C 3rd reference point 322 Installation position 323 Reference point setting section 324A,324B,324C distance information 325,326 Information

Claims

1. a target position determination unit that determines a target position for radio wave irradiation by a radio wave sensor in an image including a crosswalk; a candidate position designation unit that accepts designation from a user of a candidate position in the image that is a candidate for an installation position of the radio wave sensor; a display control unit that displays, on a display device, a radio wave irradiation range of the radio wave sensor that is determined based on the determined target position and the designated candidate position, superimposed on the image; Equipped with the candidate position designation unit is capable of receiving an instruction from the user to move the designated candidate position, when the candidate position designation unit receives the instruction to move, the display control unit changes the shape of the radio wave irradiation range in accordance with the movement of the designated candidate position while keeping the target position fixed; the display control unit causes the display device to display a planned detection area, which is planned as a detection area for the radio wave sensor to detect an object, superimposed on the image and the radio wave irradiation range. Radio wave sensor installation support device.

2. an input device for specifying coordinates in the image; the candidate position designation unit accepts a continuous change in coordinates designated by the user via the input device as an instruction to move the candidate position; the display control unit changes the shape of the radio wave irradiation range by real-time processing in accordance with continuous changes in the specified coordinates. The radio wave sensor installation support device according to claim 1.

3. the display control unit causes the display device to display a straight line or a line segment connecting the target position and the candidate position superimposed on the image and the radio wave irradiation range. The radio wave sensor installation support device according to claim 1 or 2.

4. the straight line or the line segment is an arrow pointing from the candidate position to the target position; The radio wave sensor installation support device according to claim 3.

5. The planned detection area is divided into a plurality of partial areas, the display control unit causes the display device to display each of the plurality of partial areas superimposed on the image and the radio wave irradiation range. The radio wave sensor installation support device according to any one of claims 1 to 4.

6. the display control unit displays a non-irradiated area in which radio waves irradiated by the radio wave sensor are blocked by an object, superimposed on the image; the display control unit changes the shape of the non-illumination area in response to movement of the instructed candidate position. The radio wave sensor installation support device according to any one of claims 1 to 5.

7. the display control unit controls the display device to display a mark indicating an evaluation result of the candidate position as an installation position of the radio wave sensor at the candidate position in the image. The radio wave sensor installation support device according to any one of claims 1 to 6.

8. the candidate position designation unit accepts designation from the user of an area in the image that includes the plurality of candidate positions; the display control unit causes the display device to display a plurality of the marks corresponding to the plurality of candidate positions, respectively, in the area in the image specified by the user; The radio wave sensor installation support device according to claim 7.

9. the display control unit causes the display device to display the mark in a color corresponding to the rank of the candidate position.

9. The radio wave sensor installation support device according to claim 7 or 8.

10. A computer program for causing a computer to assist in installation of a radio wave sensor, The computer a target position determination unit that determines a target position for radio wave irradiation by the radio wave sensor in an image including a crosswalk; a candidate position designation unit that accepts designation from a user of a candidate position in the image that is a candidate for an installation position of the radio wave sensor; a display control unit that displays, on a display device, a radio wave irradiation range of the radio wave sensor that is determined based on the determined target position and the designated candidate position, superimposed on the image; It functions as the candidate position designation unit is capable of receiving an instruction from the user to move the designated candidate position, when the candidate position designation unit receives the instruction to move, the display control unit changes the shape of the radio wave irradiation range in accordance with the movement of the designated candidate position while keeping the target position fixed; the display control unit causes the display device to display a planned detection area, which is planned as a detection area for the radio wave sensor to detect an object, superimposed on the image and the radio wave irradiation range. Computer program.

11. 1. A method for determining an installation position of a radio wave sensor, comprising: determining an installation position of the radio wave sensor using an installation support device that supports installation of the radio wave sensor, a step of specifying a candidate position that is a candidate for the installation position of the radio wave sensor in an image including the crosswalk displayed on the installation support device, and displaying on the installation support device a target position for radio wave irradiation by the radio wave sensor and a radio wave irradiation range of the radio wave sensor that is determined based on the specified candidate position superimposed on the image; instructing the installation support device to move the designated candidate position, thereby causing the installation support device to change the shape of the radio wave irradiation range in accordance with the movement of the designated candidate position while keeping the target position fixed; a step in which the installation assistance device displays a planned detection area, which is planned as a detection area for the radio wave sensor to detect an object, by superimposing the planned detection area on the image and the radio wave irradiation range; Including, A method for determining the installation location of a radio wave sensor.

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