Road diagnosis system, road diagnostic method, and recording medium

Abstract

This road diagnosis system includes an acquisition unit, an estimation unit, a partial deterioration degree calculation unit, a calculation unit, and an output unit. The acquisition unit acquires data on a road acquired by a device mounted on a vehicle and position information of the vehicle at the time of acquisition of the data. The estimation unit calculates the deterioration degree of the road on the basis of the data on the road, and estimates the deterioration degree of the road traveled by the vehicle in each of divided sections, which are obtained by dividing an area on a map into a plurality of sections, on the basis of the calculated deterioration degree and the position information. The partial deterioration degree calculation unit calculates a partial deterioration degree on the basis of the deterioration degree of the road traveled by the vehicle in each divided section. The partial deterioration degree is the deterioration degree of the road of a portion of a management section, which indicates a unit section for road management, that is included in each divided section. The calculation unit calculates the deterioration degree of the road in each management section on the basis of the calculated partial deterioration degree. The output unit outputs the deterioration degree of the road in each of the management sections.

Description

Road diagnosis system, road diagnosis method, and recording medium

[0001] The present disclosure relates to a road diagnosis system and the like.

[0002] A road administrator monitors the road surface condition at each point on a road under management, for example, by driving a vehicle along the road. The road administrator then determines whether or not road repairs are necessary based on the results of monitoring the road surface condition. The road administrator, for example, manages the road under management by section, which is the unit of road management. Therefore, the need for road repairs is determined, for example, for each section, which is the unit of road management. Furthermore, patrolling the road under management and monitoring each point can require a lot of work time. For this reason, road surface conditions are also monitored using video footage of the road.

[0003] The road condition management device of Patent Document 1 acquires road surface condition information managed by multiple types of location information, including crack information, from video footage of the road surface.The road condition management device of Patent Document 1 then allocates and extracts the road condition information managed by multiple types of location information for each management unit.

[0004] International Publication No. 2018 / 066116

[0005] With the technology described in Patent Document 1, it may be difficult to estimate the road conditions for each section that serves as a unit for road management.

[0006] In order to solve the above-mentioned problems, the present disclosure aims to provide a road diagnosis system etc. that can easily calculate the degree of deterioration of a road for each section that serves as a unit for road management.

[0007] In order to solve the above problems, the road diagnosis system disclosed herein comprises an acquisition means for acquiring data regarding roads acquired by a device mounted on a vehicle and the vehicle's location information at the time the data was acquired; an estimation means for calculating the degree of deterioration of the road based on the data and estimating the degree of deterioration of the road on which the vehicle has traveled in each divided section, which is a section obtained by dividing an area on a map into multiple sections, based on the calculated degree of deterioration and the location information; a partial deterioration degree calculation means for calculating the partial deterioration degree, which is the degree of deterioration of the portion of the road included in each divided section of the management section, which indicates the section that is the unit of road management, based on the degree of deterioration of the road on which the vehicle has traveled in each divided section; a calculation means for calculating the degree of deterioration of the road in each management section based on the calculated partial deterioration degree; and an output means for outputting the degree of deterioration of the road in each management section.

[0008] The road diagnosis method disclosed herein acquires data regarding roads obtained by a device installed in a vehicle and the vehicle's location information at the time the data was acquired, calculates the degree of deterioration of the road based on the data, estimates the degree of deterioration of the roads on which the vehicle has traveled in each of the divided sections, which are sections on a map that divide an area into multiple sections, based on the calculated degree of deterioration and the location information, calculates the partial deterioration degree, which is the degree of deterioration of the portions of the road included in each divided section of the management section, which indicates the section that is the unit of road management, based on the degree of deterioration of the roads on which the vehicle has traveled in each divided section, calculates the degree of deterioration of the roads in each management section based on the calculated partial deterioration degree, and outputs the degree of deterioration of the roads in each management section.

[0009] The recording medium of the present disclosure non-temporarily records a road diagnosis program that causes a computer to execute the following processes: a process of acquiring data regarding roads acquired by a device mounted on a vehicle and the vehicle's location information at the time the data was acquired; a process of calculating the degree of deterioration of the road based on the data, and a process of estimating the degree of deterioration of the road on which the vehicle has traveled in each divided section, which is a section that divides an area on a map into multiple sections, based on the calculated degree of deterioration and the location information; a process of calculating the partial deterioration degree, which is the degree of deterioration of the portion of the road included in each divided section of the management section that indicates the section that is the unit of road management, based on the degree of deterioration of the road on which the vehicle has traveled in each divided section; a process of calculating the degree of deterioration of the road in each management section based on the calculated partial deterioration degree; and a process of outputting the degree of deterioration of the road in each management section.

[0010] According to the present disclosure, it is possible to easily calculate the degree of deterioration of a road for each section, which is the unit of road management.

[0011] FIG. 1 is a diagram illustrating an example of the configuration of a road management system according to an embodiment of the present disclosure. FIG. 2 is a diagram schematically illustrating an example of the configuration of a road diagnosis system according to an embodiment of the present disclosure. FIG. 3 is a diagram illustrating an example of the relationship between a traveling section and a management section according to an embodiment of the present disclosure. FIG. 4 is a diagram illustrating an example of a management section according to an embodiment of the present disclosure. FIG. 5 is a diagram illustrating an example of setting the start point and end point of a management section according to an embodiment of the present disclosure. FIG. 6 is a diagram illustrating an example of a display screen according to an embodiment of the present disclosure. FIG. 7 is a diagram illustrating an example of the operation flow of a road diagnosis system according to an embodiment of the present disclosure. FIG. 8 is a diagram illustrating an example of a hardware configuration according to an embodiment of the present disclosure.

[0012] An embodiment of the present disclosure will be described in detail with reference to the drawings. FIG. 1 is a diagram illustrating an example of the configuration of a road management system. The road management system includes a road diagnosis system 10, an on-vehicle device 20, and a terminal device 30. The road diagnosis system 10 is connected to the on-vehicle device 20 via a network. The road diagnosis system 10 is also connected to the terminal device 30 via the network. Data input / output between the road diagnosis system 10 and the on-vehicle device 20 may be performed via a storage device. For example, data input / output between the road diagnosis system 10 and the on-vehicle device 20 may be performed via a non-volatile semiconductor storage device. There may be a plurality of on-vehicle devices 20 and a plurality of terminal devices 30. The number of on-vehicle devices 20 and the number of terminal devices 30 are set as appropriate.

[0013] The road management system calculates the degree of road deterioration in each managed section based on road-related data, for example. The road-related data may be, for example, video footage of the road. The road-related data may be the acceleration of a vehicle traveling on the road. The vehicle acceleration may be, for example, data indicating the vibration of a vehicle traveling on the road. The road-related data is not limited to the above. The managed section is, for example, a section that serves as a unit of road management. For example, a road administrator determines whether repair work is necessary for each managed section of a road that is under management. Then, the road administrator carries out repair work in managed sections that are determined to require repair. The distance of each managed section is set, for example, by the road administrator. In other words, the distance of a managed section may differ for each road administrator. Each managed section is set, for example, by dividing the distance from the start point to the end point of a road that is subject to road management into distances determined by the road administrator. For example, if the distance per managed section is set to 100 meters, each managed section is set by dividing the distance from the start point to the end point of a road that is subject to road management into 100-meter intervals.

[0014] For example, the road management system estimates the degree of deterioration of the road on which the vehicle traveled in each divided section from a video of the road. Then, for example, the road management system calculates the degree of deterioration of the road in each managed section from the degree of deterioration of the road on which the vehicle traveled in each divided section. The road on which the vehicle traveled is also called the driving route. For example, the driving route is the path the vehicle traveled to photograph the road. For example, the driving route is recorded using the position of the vehicle while it was traveling.

[0015] A divided section is, for example, an area separated by a mesh when an area including a road for which the road deterioration level is to be calculated is divided into a mesh. For example, an area mesh can be used as the divided section. Area meshes are specified, for example, by the Japanese Industrial Standards. For example, a mesh based on a reference area mesh is used as the area mesh. A divided section may be a section obtained by further dividing the reference area mesh. A divided area mesh from the area mesh may be used as the divided section. A divided section may be a section obtained by further dividing the divided area mesh. A divided section is not limited to an area mesh. Furthermore, a divided section may be set by a road administrator.

[0016] The degree of road deterioration is, for example, an index indicating the degree of deterioration of the road surface. Road deterioration refers, for example, to a state in which the road surface becomes impediment to traffic. When the road surface deterioration is cracks, the degree of deterioration is, for example, the crack rate. The crack rate is, for example, a value indicating the ratio between the area of ​​deterioration included in an image captured at a certain point and the area of ​​the road included in the image. When the road surface deterioration is rutting, the degree of deterioration is, for example, the amount of rutting. Furthermore, when the road surface deterioration is abnormal flatness, the degree of deterioration is, for example, the International Roughness Index (IRI). The IRI is an index indicating the flatness of the road. The IRI may be estimated based on the vertical acceleration of a vehicle. The measured value of the vertical acceleration reflects, for example, the vertical vibration of the vehicle when traveling over ruts. The vertical acceleration is measured, for example, by an acceleration sensor attached to the vehicle. Alternatively, the degree of deterioration may be expressed as a Maintenance Control Index (MCI), which is a composite deterioration index estimated from, for example, the crack rate, the amount of rutting, and flatness.

[0017] An example of the configuration of the road diagnosis system 10 will now be described. Fig. 2 is a diagram showing an example of the configuration of the road diagnosis system 10. The road diagnosis system 10 basically includes an acquisition unit 11, an estimation unit 12, a partial deterioration degree calculation unit 13, a calculation unit 14, and an output unit 15. The road diagnosis system 10 may further include, for example, a storage unit 16.

[0018] The acquisition unit 11 acquires road-related data and vehicle position information at the time the video was captured by a device mounted on the vehicle. For example, the acquisition unit 11 acquires, as road-related data, video of the road captured by a device mounted on the vehicle. For example, the acquisition unit 11 acquires time-series video of the road captured from a traveling vehicle and data on the vehicle's position at the time the video was captured. The acquisition unit 11 may acquire video of the road with information about the location where the video was captured added. Furthermore, the acquisition unit 11 may acquire video captured by traveling the same section of road multiple times and vehicle position information at the time each video was captured.

[0019] The acquisition unit 11 acquires, for example, from the in-vehicle device 20, time-series images of a road captured from a traveling vehicle and vehicle position information at the time of capturing the images. The acquisition unit 11 may further acquire information on the speed and acceleration of the vehicle when the road images were captured. The acquisition unit 11 may acquire the images of the road to be diagnosed from the in-vehicle device 20 via a storage medium. For example, a non-volatile semiconductor storage device is used as the storage medium. The storage medium is not limited to the above. The acquisition unit 11 may also acquire, from a server connected to a network, images of the road to be assessed for calculating the road deterioration level.

[0020] The acquisition unit 11 acquires, for example, information specifying a road for which the road deterioration level is to be calculated. The acquisition unit 11 may also acquire information indicating a section of the road for which the road deterioration level is to be calculated, among the roads for which the road deterioration level is to be calculated. When the roads for which the road diagnosis system 10 calculates the deterioration level are predetermined, it is not necessary to acquire information specifying the road and section for which the road deterioration level is to be calculated. For example, when a road administrator repeatedly calculates the deterioration level of roads under management, the acquisition unit 11 does not need to acquire information specifying the road and section for which the road deterioration level is to be calculated each time the deterioration level is calculated. The road and section for which the road deterioration level is to be calculated are specified by, for example, the road administrator. The road administrator may include a person entrusted by the road administrator with road monitoring, a company entrusted with road repair work, and a person in charge of the company. The information specifying the road and section for which the road deterioration level is to be calculated is input, for example, to the terminal device 30 by the road administrator. The acquisition unit 11 then acquires, for example, from the terminal device 30, information specifying the road and section for which the road deterioration level is to be calculated.

[0021] The acquisition unit 11 may acquire information specifying the distance of the management section. The distance of the management section is specified, for example, using the distance per section. The distance of the management section is specified, for example, by the road administrator. Furthermore, when the acquisition unit 11 changes the distance of the management section after calculating the deterioration level of each road in the management section, the acquisition unit 11 may acquire information specifying the distance of the management section after the change. The information specifying the distance of the management section is input, for example, to the terminal device 30 by the road administrator. Then, the acquisition unit 11 acquires the information specifying the distance of the management section from, for example, the terminal device 30.

[0022] The acquisition unit 11 may acquire information specifying the setting of divided sections. For example, the acquisition unit 11 may acquire information specifying the size of the divided area mesh to be used as the divided area. The acquisition unit 11 may also acquire map data of the area where the roads to be managed exist.

[0023] The estimation unit 12 calculates the degree of deterioration of the road based on data related to the road, and estimates the degree of deterioration of the road on which the vehicle has traveled in each of the divided sections, which are sections obtained by dividing an area on a map, based on the calculated degree of deterioration and location information. For example, the estimation unit 12 estimates the degree of deterioration of the road on which the vehicle has traveled in each of the divided sections, which are sections obtained by dividing an area on a map, based on the degree of deterioration calculated from the video and location information. The estimation unit 12 identifies frames taken in each divided section from the video based on the vehicle's location information, and estimates the degree of deterioration of the vehicle's travel route for each divided section. The vehicle's travel route is the route traveled by the vehicle indicated by the vehicle's location information.

[0024] For example, the estimation unit 12 compares the shooting time added to the video with the time at which the location information added to the vehicle's location information was acquired to estimate the shooting location of each frame included in the video. When the shooting time and the time at which the location information was acquired do not match, the estimation unit 12 may estimate the shooting location of each frame based on, for example, the shooting time of each of multiple consecutive frames and the time at which each of multiple consecutive frames was acquired and the location information. For example, the estimation unit 12 may compare the shooting time added to the video with the time at which the location information added to the vehicle's location information was acquired to estimate the shooting location of each frame included in the video. The shooting time may include information indicating the date on which the video was shot. The time at which the location information was acquired may include information indicating the date on which the location information was acquired. Furthermore, the shooting location and the vehicle's location information are indicated using, for example, latitude and longitude. For example, the estimation unit 12 compares the location at which the frame was shot with the range of each divided section to identify the frame shot in each divided section. The range of each divided section is set using, for example, information specifying the perimeter of the divided section. For example, if each divided section is divided into meshes, the range of the divided section may be set using the latitude and longitude of the positions of the four corners.

[0025] FIG. 3 is a diagram schematically illustrating an example of the relationship between travel sections and management sections. In the example of FIG. 3, six division sections, from division section A to division section F, are set. In the example of FIG. 3, each rectangular frame represents a division section. In the example of FIG. 3, the travel sections indicated by solid arrows are sections of the vehicle's travel route in each division section where the vehicle traveled. The travel route is identified, for example, by connecting points indicated by the vehicle's position information with lines and performing a smoothing process on the connected lines. In the example of FIG. 3, which identifies the travel route, the vehicle travels on a travel route including travel sections 1, 2, and 3. For example, travel section 1 indicated by a solid arrow in the example of FIG. 3 is a section within division section C of the travel route. Travel section 1 indicates the vehicle's travel position within division section C based on the vehicle's position information. In addition, in the example of FIG. 3, the management sections indicated by dashed arrows are, for example, sections within each division section of the managed area set on the map. Furthermore, when a vehicle travels on a road subject to management, a difference may occur between the position of the travel section and the position of the management section due to a measurement error of the vehicle position. For example, in the example of Figure 3, the positional difference between the travel section 1 and the management section 1 occurs due to, for example, a measurement error of the vehicle position.

[0026] In the example of Figure 3, when estimating the degree of deterioration of the road in divided section C, the estimation unit 12 estimates the degree of deterioration of the road in divided section 1 based on, for example, frames of footage of the road taken while traveling along the driving route in driving section 1.

[0027] When there are multiple frames captured within the same partition, the estimation unit 12, for example, estimates the degree of road deterioration from each frame. Then, the estimation unit 12, for example, estimates the average value of the road deterioration levels in the multiple frames as the degree of road deterioration on the travel route within the partition. Furthermore, the estimation unit 12 may, for example, estimate the degree of road deterioration on the travel route within the partition using a statistical value other than the average of the road deterioration levels in the multiple frames. The statistical value used to estimate the degree of road deterioration is, for example, a maximum value, a minimum value, or a median. The statistical value used to estimate the degree of road deterioration is not limited to the above.

[0028] 3 , when estimating the degree of road deterioration in divided section C, if there are multiple frames captured in travel section 1, the estimation unit 12 estimates, for example, the degree of road deterioration in each of the frames captured while traveling in travel section 1. Then, the estimation unit 12 estimates, for example, the average value of the degrees of road deterioration in the frames captured while traveling in travel section 1 as the degree of road deterioration on the travel route within divided section C.

[0029] The estimation unit 12 calculates the degree of deterioration of the road surface using, for example, a deterioration estimation model. The deterioration estimation model, for example, takes a frame included in a video showing the road surface as input and calculates the degree of deterioration of the road surface shown in the frame. The deterioration estimation model is, for example, a learning model using image recognition technology. The deterioration estimation model is generated, for example, by machine learning. The deterioration estimation model is generated, for example, by deep learning using a neural network. The deterioration estimation model is generated, for example, by learning the relationship between frames showing the road surface and the degree of deterioration. The deterioration estimation model is generated, for example, in a system external to the road diagnosis system 10.

[0030] The estimation unit 12 may calculate the deterioration level using a different deterioration level estimation model for each type of road surface deterioration. The estimation unit 12 calculates the deterioration level using a deterioration level estimation model with different learning data for each type of road surface deterioration. The estimation unit 12 then calculates the deterioration level for each type of road surface deterioration using, for example, one or more different deterioration level estimation models, and estimates the deterioration level of the road in the divided section from the deterioration level for each type. For example, the estimation unit 12 calculates the deterioration level of a road surface crack using a deterioration level estimation model that estimates the deterioration level of a crack in the road surface captured in video. The deterioration level estimation model that calculates the deterioration level of a road surface crack is, for example, a model that detects cracks in the road surface from video and calculates the deterioration level of the crack based on the width and length of the crack. The deterioration level estimation model that calculates the deterioration level of a road surface crack is generated, for example, by learning the relationship between images that capture cracks and the deterioration level.

[0031] When calculating the deterioration level using a different deterioration level estimation model for each type of road surface deterioration, for example, the estimation unit 12 may estimate the number of potholes using a deterioration level estimation model that estimates the number of potholes on a road. The deterioration level estimation model that estimates the number of potholes is generated by learning the relationship between an image showing potholes and the presence or absence of potholes or the number of potholes. Furthermore, the estimation unit 12 may estimate the deterioration level using a deterioration level estimation model that is generated using a different machine learning algorithm for each type of road surface deterioration. Furthermore, the deterioration level estimation model is generated, for example, outside the road diagnosis system 10.

[0032] The estimation unit 12 may estimate the degree of road deterioration in each of the subdivisions, which are subdivisions obtained by further dividing a divided section at shorter distances in a section where the road curves. The subdivisions are set, for example, as sections with a distance that can reduce errors when approximating a curved road to a straight line. That is, the subdivisions are sections with a distance that can approximate the road as a straight line. For example, in a section where the road curves, the subdivisions are used to estimate the degree of partial deterioration by dividing the driving route and the management section at short distances and approximating them to straight lines. For example, in a section where the road curves, the estimation unit 12 estimates the degree of road deterioration at points included in each subdivision. Furthermore, the size of the subdivisions is set, for example, based on the curvature of the curve.

[0033] The partial deterioration level calculation unit 13 calculates the partial deterioration level based on the deterioration level of the road in each divided section on the travel route corresponding to the managed section. The partial deterioration level is the deterioration level of the portion of the road included in each divided section of the managed section, which indicates the section that is the unit of road management. For example, the partial deterioration level calculation unit 13 can use the deterioration level of the road on which the vehicle traveled in each divided section as the partial deterioration level of the portion included in each similar divided section.

[0034] Furthermore, instead of directly using the degree of deterioration of the road on which the vehicle traveled in each divided section as the degree of partial deterioration of the portion included in each divided section, the partial deterioration degree calculation unit 13 may perform the following calculation. For example, when one divided section includes multiple management sections, the partial deterioration degree calculation unit 13 calculates the degree of partial deterioration based on the ratio of the distances of the management sections included in one divided section. For example, in the example of Figure 3, management section 1 straddles divided sections B and C. In this case, the partial deterioration degree D in divided section B of management section 1 is １Ｂ For example, D １Ｂ = (Deterioration level of driving section 2) × (Distance of management section 1 within divided section B) ÷ (Total distance of management sections included in divided section B). The distance of the management sections within divided section B can be calculated using the formula: (Total distance of management sections included in divided section B) = (Distance of management section 1 within divided section B) + (Distance of management section 2 within divided section B).

[0035] Furthermore, the partial deterioration level calculation unit 13 may calculate the deterioration level of a divided section as the partial deterioration level of each management section included in the divided section. For example, if the deterioration level of divided section B is D Ｂ In this case, the partial deterioration degree D of the divided section B of the management section 1 is １Ｂ and partial deterioration degree D of divided section B of management section 1 ２Ｂ D １Ｂ =D ２Ｂ =D Ｂ It is calculated so that:

[0036] Furthermore, the partial deterioration degree calculation unit 13 may calculate the partial deterioration degree of each management section based on the number of management sections included in the divided section. For example, the partial deterioration degree calculation unit 13 calculates the partial deterioration degree of each management section by equally dividing the deterioration degree using the number of management sections included in the divided section. For example, if the deterioration degree of divided section B is D Ｂ In this case, when the divided section B includes two control sections, control section 1 and control section 2, the partial deterioration degree D of the divided section B of control section 1 is １Ｂ and partial deterioration degree D of divided section B of management section 1 ２ＢD １Ｂ =D ２Ｂ =D Ｂ Calculate it so that it is ÷2.

[0037] Furthermore, a deviation may occur between a driving route based on the vehicle's position information and a management section set on a road to be managed on a map due to errors in position measurement. For this reason, for example, the partial deterioration level calculation unit 13 determines whether the vehicle's driving route matches the road on which the management section is set. For example, if the distance between the start point and the end point within a divided section between the vehicle's driving route and the road on which the management section is set is within a criterion, the partial deterioration level calculation unit 13 determines that the vehicle has traveled on a road on which the management section is set, and calculates the partial deterioration level. For example, if the criterion is set to within 20 meters, the partial deterioration level calculation unit 13 determines that the vehicle has traveled on a road on which the management section is set if the distance between the start point and the end point within a divided section between the vehicle's driving route and the road on which the management section is set is within 20 meters. The criterion for determining that the vehicle has traveled on a road on which the management section is set is set, for example, based on the accuracy of vehicle position measurement, so that the driving route can be considered to match the road on which the management section is set.

[0038] When the management section extends only halfway through the divided section, the partial deterioration degree calculation unit 13 determines whether the above-mentioned criteria are met, for example, when the management section is extended, by setting the point where the extension intersects with the boundary of the divided section as the starting point or end point.

[0039] FIG. 4 shows an example of a management section included in two divided sections. In the example of FIG. 4 , management section 2 is set with a point inside divided section B as its start point and a point inside divided section A as its end point. For example, in the example of FIG. 4 , management section 2 is set on a road that runs from the middle of divided section B to the middle of divided section A. That is, in the example of FIG. 4 , management section 2 only extends partway through each divided section. In this case, the partial deterioration level calculation unit 13 extends the start and end points of the road in management section 2, for example. Then, for example, the partial deterioration level calculation unit 13 determines whether the distances between the start and end points within each divided section are within a criterion, setting the point where management section 2 intersects with a mesh as the start or end point in each divided section. For example, in the illustrated example, the partial deterioration level calculation unit 13 determines whether the point where management section 2 intersects with a mesh when extended in divided section A satisfies the criterion for the end point of management section 2 in divided section A. Also, for example, in the case shown in the figure, the partial deterioration level calculation unit 13 determines whether the point where the management section 2 is extended and intersects with the mesh in the divided section B satisfies the criteria for being the end point of the management section 2 in the divided section B.

[0040] 5 shows an example of determining whether a criterion is satisfied when the management section is extended in the example of FIG. 4 , with the point where the extension intersects with the boundary of the divided section as the start point or end point. In the example of FIG. 5 , the partial deterioration level calculation unit 13 extends, for example, the end point side of management section 2 to the boundary of divided section A. Then, for example, in divided section A, the partial deterioration level calculation unit 13 determines whether the travel route and management section 2 match, with the point where management section 2 intersects with the outer periphery of divided section A as the start point and the point where the line extending management section 2 intersects with the outer periphery of divided section A as the end point. In this case, the travel route is represented by travel section 1 and travel section 2. Also, in the example of FIG. 5 , the partial deterioration level calculation unit 13 extends, for example, the start point side of management section 2 to the boundary of divided section B. Then, the partial deterioration degree calculation unit 13 determines whether the driving route and the management section 2 match, for example, in the divided section B, using the point where the management section 2 intersects with the outer periphery of the divided section B as the end point and the point where a line extending the management section 2 intersects with the outer periphery of the divided section B as the start point.

[0041] When two or more roads run parallel to each other, the partial deterioration degree calculation unit 13 may determine that the vehicle has passed through a road that is close to the driving route.The partial deterioration degree calculation unit 13 may determine that the vehicle has passed through a road selected by a road administrator.When two or more roads run parallel to each other, the partial deterioration degree calculation unit 13 may determine that the vehicle has passed through a road selected by a road administrator.

[0042] When the size of the divided section is changed, the partial deterioration degree calculation unit 13 calculates, for example, the partial deterioration degree after the size of the divided section is changed. For example, when the acquisition unit 11 acquires the changed value of the size of the divided section, the partial deterioration degree calculation unit 13 calculates the partial deterioration degree of each management section using the divided section after the change.

[0043] The partial deterioration degree calculation unit 13 calculates the partial deterioration degree based on, for example, the position information of each management section identified based on the information on the distance of the management section acquired by the acquisition unit 11. For example, the partial deterioration degree calculation unit 13 identifies the position of each management section by dividing the management section into sections based on the distance of the management section from the starting point of the road to be managed, and calculates the partial deterioration degree of each management section.

[0044] When the distance of a management section is changed, the partial deterioration degree calculation unit 13 recalculates the partial deterioration degree of each management section, for example, based on the set value of the distance of the management section after the change. For example, when the set value of the distance of a management section is changed from 100 meters to 50 meters, the partial deterioration degree calculation unit 13 calculates the road deterioration degree for each management section divided into 50-meter intervals.

[0045] The partial deterioration degree calculation unit 13 may calculate the partial deterioration degree of each of the subdivisions, which are divisions obtained by further dividing the divided division into smaller divisions in a section where the road curves. For example, the partial deterioration degree calculation unit 13 calculates the partial deterioration degree of each of the subdivisions in a section where the road curves. Then, the partial deterioration degree calculation unit 13 calculates, for example, the average value of the partial deterioration degrees of the subdivisions included in the divided division as the partial deterioration degree of the divided division.

[0046] The calculation unit 14 calculates the deterioration level of the road in each managed section based on the partial deterioration level calculated by the partial deterioration level calculation unit 13. In the process of calculating the deterioration level of the road in each managed section, for example, when a managed section is included in a plurality of divided sections, the calculation unit 14 calculates the deterioration level based on the distance of the managed section included in each divided section and the partial deterioration level of the road in each divided section estimated by the estimation unit 12. For example, when the partial deterioration level of managed section 1 included in divided section C is D, the calculation unit 14 calculates the deterioration level based on the distance of the managed section included in each divided section and the partial deterioration level of the road in each divided section estimated by the estimation unit 12. １Ｃ and the partial deterioration degree of the management section 1 included in the divided section B is D １Ｂ In this case, the deterioration level D1 of the management section 1 is １ = (D １Ｂ × (distance of management section 1 included in divided section B) + D １Ｃ × (distance of management section 1 included in divided section C) ÷ (distance of management section 1 included in divided section B + distance of management section 1 included in divided section C). １ = (D １Ｂ × (vehicle travel distance in divided section B) + D １Ｃ Alternatively, the distance traveled by the vehicle in the divided section C may be calculated using the formula: × (distance traveled by the vehicle in the divided section C) / (distance traveled by the vehicle in the divided section B + distance traveled by the vehicle in the divided section C).

[0047] When one management section is included in multiple divided sections, the calculation unit 14 may calculate the partial deterioration level of the divided section with the largest partial deterioration level as the deterioration level of the road in the management section. For example, when the partial deterioration level of management section 1 included in divided section C is D １Ｃ and the partial deterioration degree of the management section 1 included in the divided section B is D １Ｂ In the case where D １Ｃ >D １Ｂ In this case, the calculation unit 14 calculates the deterioration degree D1 of the management section 1 as follows: １ =D １Ｂ It is calculated so that:

[0048] When calculating the deterioration level of a road using images captured multiple times while driving on the same road, the calculation unit 14 calculates the deterioration level of the road using, for example, partial deterioration levels calculated based on images in which the vehicle travels in the same direction. For example, in the example of Fig. 3, the calculation unit 14 calculates the deterioration level of the road for each managed section using partial deterioration levels calculated from multiple images of the vehicle traveling from divided section C to divided section B, among images taken on different dates and times.

[0049] When at least one of the travel route and the management section does not pass through two opposing sides of the mesh in the divided section, the calculation unit 14 calculates the deterioration level of the road in the management section, for example, by interpolating based on the partial deterioration levels of the other divided sections. For example, in the example of Figure 3, when the travel route of divided section A does not pass through two opposing sides of the mesh in the divided section, the calculation unit 14 calculates the deterioration level of the road in the management section using the partial deterioration level of at least one of the divided section adjacent to divided section A on the opposite side of divided section B and divided section B.

[0050] When the distance of a management section is changed, the calculation unit 14 recalculates the road deterioration level in each management section, for example, based on the set value of the distance of the management section after the change. For example, when the set value of the distance of a management section is changed from 100 meters to 50 meters, the calculation unit 14 calculates the road deterioration level for each management section divided into 50-meter intervals. In this case, the calculation unit 14 calculates the road deterioration level in each management section based on the partial deterioration level calculated by the partial deterioration level calculation unit using the changed distance of the management section, for example.

[0051] When the size of the divided sections is changed, the calculation unit 14 calculates the degree of deterioration of the road in each management section, for example, based on the degree of partial deterioration after the divided sections are changed. For example, when the size of the divided sections is changed from a quarter area mesh with a side length of approximately 250 meters to a one-eighth area mesh with a side length of approximately 125 meters, the calculation unit 14 calculates the degree of deterioration of the road based on the degree of partial deterioration when the one-eighth area mesh is used as the divided section.

[0052] The output unit 15 outputs the road deterioration level in each managed section. For example, the output unit 15 outputs a list associating the identification information of the managed section with the road deterioration level of each managed section. The identification information of the managed section is, for example, the number, name, or distance from the starting point of the managed section. The identification information of the managed section is not limited to the above. The output unit 15 may also output a list in which the managed sections are arranged in descending order of road deterioration level. The output unit 15 may also output the road deterioration level using a stage set based on the deterioration level value. When the road deterioration level is represented using stages, the output unit 15 may output the number of managed sections in each stage. When one managed section spans multiple divided sections, the output unit 15 may output the road deterioration level of the managed section by further associating the road deterioration level of the managed section with the road deterioration level of each of the multiple divided sections.

[0053] When a pothole exists in a divided section, the output unit 15 outputs, for example, the deterioration level of the road in the managed section included in the divided section in which the pothole exists, linked to information indicating the pothole.

[0054] When an operation to select a management section is performed on the display screen, the output unit 15 outputs, for example, at least one of the partial deterioration level, deterioration mode, and video of the road in the selected management section. Furthermore, when the length of the management section is changed, the output unit 15 outputs, for example, the recalculated road deterioration level in each management section. Furthermore, when the size of the divided sections is changed, the output unit 15 outputs, for example, the recalculated road deterioration level in each management section.

[0055] The output unit 15 may output the deterioration level of the road in each managed section superimposed on the map. For example, the output unit 15 displays an arrow with a length indicating the distance of the managed section superimposed on the road on the map corresponding to the managed section in a manner corresponding to the deterioration level of the road in the managed section. The output unit 15 may output the deterioration level of the road in each managed section superimposed on the map using a symbol or graphic representing the deterioration level of the road.

[0056] 7 shows an example of a display screen of the calculation results of the road deterioration level for each managed section. In the example of the display screen in FIG. 7, information indicating the location displayed on the map is displayed as "near S intersection." In addition, in the example of the display screen in FIG. 7, the distance of the managed section is displayed as "managed section 100 meters."

[0057] In the example display screen of FIG. 7 , the degree of road deterioration for each managed section is indicated using arrows. In the example display screen of FIG. 7 , the length of the arrow indicates the range of one managed section on the map. Also, in the example display screen of FIG. 7 , the thickness of the arrow indicates the degree of road deterioration for each managed section. In the example display screen of FIG. 7 , the thicker the arrow, the worse the degree of deterioration, indicating a higher degree of deterioration. In other words, in the example display screen of FIG. 7 , the thicker the arrow, the greater the need for road repairs. A road manager can easily determine managed sections that require repairs by referring to a display screen such as that shown in FIG. 7 , for example.

[0058] The memory unit 16 stores, for example, data related to calculation of road deterioration levels. The memory unit 16 stores, for example, data related to roads acquired by the acquisition unit 11 and vehicle position information at the time the road data was acquired. For example, the memory unit 16 stores video of a road acquired by the acquisition unit 11 and vehicle position information at the time the video was acquired. The memory unit 16 stores, for example, the road deterioration level for each divided section estimated by the estimation unit 12. The memory unit 16 stores, for example, the partial deterioration level calculated by the partial deterioration level calculation unit 13. The memory unit 16 also stores the road deterioration level for each managed section calculated by the calculation unit 14. The memory unit 16 also stores, for example, setting information for the divided sections and managed sections. The memory unit 16 may also store map data for areas where managed roads exist. The memory unit 16 also stores, for example, a deterioration level estimation model. The deterioration level estimation model may be stored in a storage device other than the memory unit 16.

[0059] The in-vehicle device 20 includes, for example, a camera that captures an image in front of the vehicle. The camera of the in-vehicle device 20 captures an image including the road surface. The camera of the in-vehicle device 20 may also capture an image behind the vehicle. The in-vehicle device 20, for example, adds information about the location where the image was captured to the captured image. The in-vehicle device 20 identifies the location of the vehicle at the time the image was captured, for example, using GNSS (Global Navigation Satellite System). The in-vehicle device 20 may identify the location of the vehicle based on a beacon that includes location information. The in-vehicle device 20 may identify the capture location based on map information and the mileage from the location where the vehicle's location was identified. The in-vehicle device 20 outputs the captured image and information about the vehicle's location at the time the image was captured to, for example, the acquisition unit 11 of the road diagnosis system 10. The in-vehicle device 20 is, for example, a drive recorder. The in-vehicle device 20 is not limited to a drive recorder.

[0060] The terminal device 30, for example, acquires the road deterioration level for each managed section calculated by the road diagnosis system 10. The terminal device 30 then outputs the acquired road deterioration level for each managed section to a display device (not shown). The terminal device 30 may be, for example, a personal computer, a tablet computer, or a smartphone. The terminal device 30 is not limited to the above examples.

[0061] An example of the operation of calculating the road deterioration level in each managed section in the road diagnosis system 10 will be described below. Fig. 7 shows an example of the flow of processing in the road diagnosis system 10 for calculating the road deterioration level in each managed section.

[0062] The acquisition unit 11 acquires a video of a road captured by a device mounted on the vehicle and location information of the vehicle at the time the video was captured (step S11). For example, the acquisition unit 11 acquires a video of a road captured by a device mounted on the vehicle and location information of the vehicle at the time the video was captured. The acquisition unit 11 acquires, for example, the video of a road captured by a device mounted on the vehicle and location information of the vehicle at the time the video was captured from the in-vehicle device 20. The acquisition unit 11 may acquire the video of a road and location information of the vehicle at the time the video was captured via a storage medium.

[0063] When the road data and the vehicle position information are acquired, the estimation unit 12 calculates the road deterioration level based on the road data, and estimates the deterioration level of the road on which the vehicle traveled in each divided section based on the calculated deterioration level and the position information (step S12). The divided sections are sections obtained by dividing an area on a map into multiple sections.

[0064] Once the deterioration levels of the roads along the vehicle's travel route have been estimated, the partial deterioration level calculation unit 13 calculates the partial deterioration level for each divided section based on the deterioration levels of the roads along which the vehicle has traveled (step S13). The partial deterioration level is the deterioration level of the portions of the roads included in each divided section of the management section that indicates the section that is the unit of road management.

[0065] After the partial deterioration level is calculated, the calculation unit 14 calculates the deterioration level of the road in the managed section based on the calculated partial deterioration level (step S14).

[0066] When the calculation of the road deterioration level for all managed sections for which the road deterioration level is to be calculated is completed (Yes in step S15), the output unit 15 outputs the road deterioration level for each managed section (step S16). The output unit 15 outputs the road deterioration level for each managed section to, for example, the terminal device 30.

[0067] In step S15, if there is a management section for which the calculation of the road deterioration level has not been completed (No in step S15), the process returns to step S14, and the calculation unit 14 calculates, for example, the road deterioration level in the management section for which the calculation of the road deterioration level has not been completed.

[0068] The road diagnosis system 10 calculates the road deterioration level from data related to the road, and estimates the deterioration level of the road on which the vehicle has traveled for each divided section based on the calculated deterioration level and the vehicle's position information at the time of data acquisition. The road diagnosis system 10 also calculates a partial deterioration level, which is the deterioration level of the portion of the road included in each divided section of the managed section, based on the deterioration level of the road on which the vehicle has traveled in each divided section. The road diagnosis system 10 also calculates the road deterioration level of each managed section based on the partial deterioration level. The road diagnosis system 10 then outputs the calculated road deterioration level for each managed section. In this way, by calculating the road deterioration of each managed section from the road deterioration level of the road on which the vehicle has traveled, the road diagnosis system 10 can easily estimate the road deterioration level for each section, which is the unit of road management.

[0069] Furthermore, by calculating the partial deterioration level based on the set value of the distance of the managed section and then calculating the deterioration level of each road in the managed section from the partial deterioration level, the road diagnosis system 10 can easily calculate the deterioration level of each road in the managed section, for example, according to the management unit of each road administrator. Furthermore, if the set value of the distance of the managed section is changed, the road diagnosis system 10 can easily recalculate the deterioration level of each road in the managed section, for example.

[0070] The processes in the road diagnosis system 10 may be distributed and executed among a plurality of information processing devices connected via a network. For example, the process in the estimation unit 12 and the process in the partial deterioration degree calculation unit 13 and the calculation unit 14 may be executed in different information processing devices. It can be set as appropriate which of the plurality of information processing devices executes each process in the road diagnosis system 10.

[0071] Each process in the road diagnosis system 10 can be realized by executing a computer program on a computer. Fig. 8 shows an example of the configuration of a computer 100 that executes a computer program that performs each process in the road diagnosis system 10. The computer 100 includes a CPU (Central Processing Unit) 101, a memory 102, a storage device 103, an input / output I / F (Interface) 104, and a communication I / F 105.

[0072] The CPU 101 reads and executes computer programs for performing each process from the storage device 103. The CPU 101 may be configured with a combination of multiple CPUs. Furthermore, the CPU 101 may be configured with a combination of a CPU and another type of processor. For example, the CPU 101 may be configured with a combination of a CPU and a graphics processing unit (GPU). The memory 102 is configured with a dynamic random access memory (DRAM) or the like, and temporarily stores computer programs executed by the CPU 101 and data being processed. The storage device 103 stores computer programs executed by the CPU 101. The storage device 103 is configured with, for example, a non-volatile semiconductor storage device. Other storage devices such as a hard disk drive may also be used for the storage device 103. The input / output I / F 104 is an interface that receives input from an operator and outputs display data, etc. The communication I / F 105 is an interface that transmits and receives data between the in-vehicle device 20, the terminal device 30, and other information processing devices. Furthermore, the terminal device 30 may have a configuration similar to that of the computer 100.

[0073] The computer program used to execute each process can also be stored and distributed on a computer-readable recording medium that non-temporarily stores data. Examples of recording media that can be used include magnetic tapes for recording data and magnetic disks such as hard disks. Optical disks such as CD-ROMs (Compact Disc Read Only Memory) can also be used as recording media. Non-volatile semiconductor storage devices can also be used as recording media.

[0074] A part or all of the above-described embodiments can be described as, but not limited to, the following supplementary notes.

[0075] [Supplementary Note 1] A road diagnosis system comprising: an acquisition means for acquiring data relating to roads acquired by a device mounted on a vehicle and location information of the vehicle at the time of acquiring the data; an estimation means for calculating a deterioration level of the road based on the data, and estimating a deterioration level of the road on which the vehicle has traveled in each of divided sections, which are sections obtained by dividing an area on a map into a plurality of sections, based on the calculated deterioration level and the location information; a partial deterioration level calculation means for calculating a partial deterioration level, which is a deterioration level of a portion of the road included in each of the divided sections of a management section, which indicates a section that is a unit of road management, based on the deterioration level of the road on which the vehicle has traveled in each of the divided sections; a calculation means for calculating a deterioration level of the road in each of the management sections based on the calculated partial deterioration level; and an output means for outputting the deterioration level of the road in each of the management sections.

[0076] [Appendix 2] The road diagnosis system described in Appendix 1, wherein when one management section is included in multiple divided sections, the calculation means calculates the deterioration level of the road in the management section based on the ratio of the distance of road traveled by the vehicle in each of the multiple divided sections and the partial deterioration level.

[0077] [Appendix 3] The road diagnosis system described in Appendix 1, wherein, when one management section is included in multiple divided sections, the calculation means calculates the deterioration level of the road in the management section based on the ratio of the distances of the management section included in each of the multiple divided sections and the partial deterioration level.

[0078] [Supplementary Note 4] The road diagnosis system according to any one of Supplementary Notes 1 to 3, wherein the partial deterioration degree calculation means determines that the vehicle has traveled on a road on which the management section is set and calculates the partial deterioration degree when the distance between the start point and the end point within the divided section between the road on which the vehicle has traveled and the road on which the management section is set is within a standard.

[0079] [Supplementary Note 5] The road diagnosis system according to any one of Supplementary Notes 1 to 4, wherein the estimation means identifies frames taken in each divided section from the video acquired as road-related data based on the vehicle's position information, and estimates the degree of deterioration of the road on which the vehicle traveled for each divided section.

[0080] [Supplementary Note 6] The road diagnosis system described in any one of Supplementary Notes 1 to 5, wherein, when a pothole is present in the divided section, the output means outputs the deterioration level of the road in the managed section included in the divided section in which the pothole is present, linked to information indicating the pothole.

[0081] [Supplementary Note 7] A road diagnosis system as described in any of Supplementary Notes 1 to 6, wherein the estimation means calculates the degree of partial deterioration in each of the subdivisions, which are sections obtained by further dividing the divided section at shorter distances in a section where the road curves, and the calculation means calculates the degree of deterioration of the road in each of the management sections based on the degree of partial deterioration in each of the subdivisions.

[0082] [Supplementary Note 8] The road diagnosis system according to any one of Supplementary Notes 1 to 7, wherein when calculating the degree of deterioration of the road using images captured by driving the same road multiple times, the calculation means calculates the degree of deterioration of the road using the partial deterioration calculated based on images in which the vehicle is traveling in the same direction.

[0083] [Supplementary Note 9] The road diagnosis system according to any one of Supplementary Notes 1 to 8, wherein the divided section is an area separated by a mesh when an area including a road for which the deterioration level of the road is to be calculated is divided into a mesh.

[0084] [Supplementary Note 10] The road diagnosis system described in Supplementary Note 9, wherein the calculation means calculates the degree of deterioration of the road in the management section by interpolating based on the partial deterioration degrees in other divisions when at least one of the road on which the vehicle has traveled and the management section does not pass through two opposing sides of a mesh in the division.

[0085] [Supplementary Note 11] The road diagnosis system described in any one of Supplementary Notes 1 to 10, wherein when one management section spans multiple divided sections, the output means associates the deterioration level of the road in the management section with the deterioration level of the road in each of the multiple divided sections and outputs the deterioration level of the road in the management section.

[0086] [Supplementary Note 12] The road diagnosis system described in any one of Supplementary Notes 1 to 11, wherein the output means displays an arrow having a length indicating the distance of the management section, superimposed on the road on the map corresponding to the management section, in a manner according to the degree of deterioration of the road in the management section.

[0087] [Supplementary Note 13] The road diagnosis system described in any one of Supplementary Notes 1 to 12, wherein when an operation to select the management section is performed on the display screen, the output means outputs at least one of the partial deterioration level, the deterioration mode, and an image of the road in the selected management section.

[0088] [Supplementary Note 14] A road diagnosis system as described in any one of Supplementary Notes 1 to 13, wherein when the distance of the management section is changed, the calculation means recalculates the deterioration level of the road in each of the management sections based on the set value of the distance of the management section after the change, and the output means outputs the recalculated deterioration level of the road in each of the management sections.

[0089] [Appendix 15] A road diagnosis system described in any of Appendices 1 to 14, wherein the partial deterioration level calculation means calculates the partial deterioration level after the size of the divided section is changed when the size of the divided section is changed, the calculation means calculates the deterioration level of the road in each of the managed sections based on the partial deterioration level after the size of the divided section is changed, and the output means outputs the deterioration level of the road in each of the managed sections after the size of the divided section is changed.

[0090] [Supplementary Note 16] The road diagnosis system according to any one of Supplementary Notes 1 to 15, wherein the calculation means calculates the deterioration level of the road based on an MCI (Maintenance Control Index) or an IRI (International Roughness Index).

[0091] [Supplementary Note 17] A road diagnosis method comprising: acquiring data relating to a road obtained by a device mounted on a vehicle and location information of the vehicle at the time of acquiring the data; calculating a deterioration level of the road based on the data; estimating a deterioration level of the road on which the vehicle has traveled in each of divided sections, which are sections obtained by dividing an area on a map, based on the calculated deterioration level and the location information; calculating a partial deterioration level, which is a deterioration level of a portion of the road included in each of the divided sections of a management section, which indicates a section that is a unit of road management, based on the deterioration level of the road on which the vehicle has traveled in each of the divided sections; calculating a deterioration level of the road in each of the management sections based on the calculated partial deterioration level; and outputting the deterioration level of the road in each of the management sections.

[0092] [Supplementary Note 18] A recording medium that non-temporarily records a road diagnosis program that causes a computer to execute the following processes: a process of acquiring data related to roads acquired by a device mounted on a vehicle and location information of the vehicle at the time of acquiring the data; a process of calculating a deterioration level of the road based on the data, and estimating a deterioration level of the road on which the vehicle has traveled in each of divided sections, which are sections obtained by dividing an area on a map into a plurality of sections, based on the calculated deterioration level and the location information; a process of calculating a partial deterioration level, which is a deterioration level of a portion of the road included in each of the divided sections of a management section that indicates a section that is a unit of road management, based on the deterioration level of the road on which the vehicle has traveled in each of the divided sections; a process of calculating a deterioration level of the road in each of the management sections based on the calculated partial deterioration level; and a process of outputting the deterioration level of the road in each of the management sections.

[0093] Furthermore, some or all of the configurations described in Supplementary Notes 2 to 16, which are dependent on Supplementary Note 1, may also be dependent on Supplementary Notes 17 and 18 in the same dependent relationship as Supplementary Notes 2 to 16. Furthermore, not limited to Supplementary Notes 1, 17, and 18, some or all of the configurations described as Supplements may be made dependent on various hardware, software, various recording means for recording software, or systems, within the scope of each of the above-mentioned embodiments.

[0094] Although the present disclosure has been described above with reference to the embodiments, the present disclosure is not limited to the above-described embodiments. Various modifications that can be understood by those skilled in the art can be made to the configuration and details of the present disclosure within the scope of the present disclosure. Furthermore, each embodiment can be combined with other embodiments as appropriate.

[0095] REFERENCE SIGNS LIST 10 Road diagnosis system 11 Acquisition unit 12 Estimation unit 13 Partial deterioration degree calculation unit 14 Calculation unit 15 Output unit 16 Storage unit 20 In-vehicle device 30 Terminal device 100 Computer 101 CPU 102 Memory 103 Storage device 104 Input / output I / F 105 Communication I / F

Claims

1. A road diagnosis system comprising: an acquisition means for acquiring data relating to roads acquired by a device mounted on a vehicle and location information of the vehicle at the time of acquiring said data; an estimation means for calculating the degree of deterioration of the road based on said data, and estimating the degree of deterioration of the road on which the vehicle has traveled in each of divided sections, which are sections obtained by dividing an area on a map into multiple sections, based on the calculated degree of deterioration and the location information; a partial deterioration degree calculation means for calculating the degree of deterioration of the part of the road included in each of the divided sections of a management section, which indicates a section that is a unit of road management, based on the degree of deterioration of the road on which the vehicle has traveled in each of the divided sections; a calculation means for calculating the degree of deterioration of the road in each of the management sections based on the calculated partial deterioration degree; and an output means for outputting the degree of deterioration of the road in each of the management sections.

2. The road diagnosis system of claim 1, wherein the calculation means, when one management section is included in multiple divided sections, calculates the deterioration level of the road in the management section based on the ratio of the distance of road traveled by the vehicle in each of the multiple divided sections and the partial deterioration level.

3. The road diagnosis system of claim 1, wherein the calculation means, when one management section is included in multiple divided sections, calculates the deterioration level of the road in the management section based on the ratio of the distances of the management section included in each of the multiple divided sections and the partial deterioration level.

4. A road diagnosis system as described in any one of claims 1 to 3, wherein the partial deterioration degree calculation means determines that the vehicle has traveled on a road on which the management section is set and calculates the partial deterioration degree if the distance between the start point and end point within the divided section between the road on which the vehicle has traveled and the road on which the management section is set is within a standard.

5. A road diagnosis system as described in any one of claims 1 to 4, wherein the estimation means identifies frames taken in each divided section from the video acquired as road-related data based on the vehicle's position information, and estimates the degree of deterioration of the road on which the vehicle traveled for each divided section.

6. A road diagnosis system as described in any one of claims 1 to 5, wherein, when a pothole is present in the divided section, the output means outputs the deterioration level of the road in the managed section included in the divided section in which the pothole is present, linked to information indicating the pothole.

7. A road diagnosis system as described in any one of claims 1 to 6, wherein the estimation means calculates the degree of partial deterioration in each of the subdivisions, which are divisions obtained by further dividing the divided section into shorter distances in sections where the road curves, and the calculation means calculates the degree of deterioration of the road in each of the managed sections based on the degree of partial deterioration in each of the subdivisions.

8. A road diagnosis system as described in any one of claims 1 to 7, wherein when the calculation means calculates the degree of deterioration of the road using images taken while driving on the same road multiple times, the calculation means calculates the degree of deterioration of the road using the partial deterioration calculated based on images in which the vehicle is traveling in the same direction.

9. A road diagnosis system according to any one of claims 1 to 8, wherein the divided sections are areas separated by mesh when an area including the road for which the deterioration level of the road is to be calculated is divided into a mesh.

10. A road diagnosis system as described in claim 9, wherein the calculation means, when at least one of the road on which the vehicle traveled and the management section does not pass through two opposing sides of a mesh in the divided section, calculates the deterioration level of the road in the management section by supplementing it based on the partial deterioration levels in other divided sections.

11. A road diagnosis system as described in any one of claims 1 to 10, wherein when one management section spans multiple divided sections, the output means associates the deterioration level of the road in the management section with the deterioration level of the road in each of the multiple divided sections, and outputs the deterioration level of the road in the management section.

12. A road diagnosis system as described in any one of claims 1 to 11, wherein the output means displays an arrow of a length indicating the distance of the managed section superimposed on the road on the map corresponding to the managed section in a manner according to the degree of deterioration of the road in the managed section.

13. A road diagnosis system as described in any one of claims 1 to 12, wherein the output means outputs at least one of the partial deterioration level, deterioration mode, and video of the road in the selected management section when an operation to select the management section is performed on the display screen.

14. A road diagnosis system as described in any one of claims 1 to 13, wherein when the distance of the management section is changed, the calculation means recalculates the deterioration level of the road in each of the management sections based on the set value of the distance of the management section after the change, and the output means outputs the recalculated deterioration level of the road in each of the management sections.

15. A road diagnosis system as described in any one of claims 1 to 14, wherein the partial deterioration degree calculation means calculates the partial deterioration degree after the size of the divided section is changed when the size of the divided section is changed, the calculation means calculates the deterioration degree of the road in each of the managed sections based on the partial deterioration degree after the size of the divided section is changed, and the output means outputs the deterioration degree of the road in each of the managed sections after the size of the divided section is changed.

16. A road diagnosis system according to any one of claims 1 to 15, wherein the calculation means calculates the degree of deterioration of the road based on the MCI (Maintenance Control Index) or the IRI (International Roughness Index).

17. A road diagnosis method comprising: acquiring data relating to a road obtained by a device mounted on a vehicle and information on the vehicle's location at the time the data was acquired; calculating the degree of deterioration of the road based on the data; estimating the degree of deterioration of the road on which the vehicle has traveled in each of divided sections, which are sections obtained by dividing an area on a map, based on the calculated degree of deterioration and the location information; calculating a partial deterioration degree, which is the degree of deterioration of the portion of the road included in each of the divided sections of a management section, which indicates a section that is a unit of road management, based on the degree of deterioration of the road on which the vehicle has traveled in each of the divided sections; calculating the degree of deterioration of the road in each of the management sections based on the calculated partial deterioration degree; and outputting the degree of deterioration of the road in each of the management sections.

18. A road diagnosis method as described in claim 17, wherein, when one management section is included in multiple divided sections, the degree of deterioration of the road in the management section is calculated based on the ratio of the distance of road traveled by the vehicle in each of the multiple divided sections and the degree of partial deterioration.

19. A road diagnosis method as described in claim 17, wherein, when one management section is included in multiple divided sections, the degree of deterioration of the road in the management section is calculated based on the ratio of the distances of the management section included in each of the multiple divided sections and the degree of partial deterioration.

20. A recording medium that non-temporarily records a road diagnosis program that causes a computer to execute the following processes: a process of acquiring road-related data acquired by a device mounted on a vehicle and the vehicle's location information at the time the data was acquired; a process of calculating the deterioration level of the road based on the data, and estimating the deterioration level of the road on which the vehicle has traveled in each of the divided sections, which are sections obtained by dividing an area on a map into multiple sections, based on the calculated deterioration level and the location information; a process of calculating the partial deterioration level, which is the deterioration level of the portion of the road included in each of the divided sections of the management section, which indicates the section that is the unit of road management, based on the deterioration level of the road on which the vehicle has traveled in each of the divided sections; a process of calculating the deterioration level of the road in each of the management sections based on the calculated partial deterioration level; and a process of outputting the deterioration level of the road in each of the management sections.

Images