JP-7854951-B2 - Matching server, matching system, anomaly detection method, and program

JP7854951B2JP 7854951 B2JP7854951 B2JP 7854951B2JP-7854951-B2

Inventors

山本哲也
二改祐介

Assignees

三菱重工機械システム株式会社

Dates

Publication Date: 20260507
Application Date: 20230217

Claims (7)

An exit vehicle information acquisition unit acquires exit vehicle information, including license plate information, from a vehicle exiting the toll road, which is read by an exit license plate reader installed at the exit toll gate of the toll road. An entry vehicle information acquisition unit acquires entry vehicle information, which includes license plate information read from vehicles entering the toll road by an entry license plate reader installed at the entrance toll gate of the aforementioned toll road, and which matches the entry vehicle information with the exit vehicle information. A passing vehicle information acquisition unit acquires passing vehicle information, which includes license plate information read from vehicles passing through a passing detection position by an intermediate license plate reader installed at a predetermined passing detection position on the toll road, and which has the highest agreement rate with the exiting vehicle information or the entering vehicle information. A determination unit that determines whether or not there is an abnormality in the intermediate license plate reader based on the aforementioned matching rate, A matching server equipped with the following features.
The aforementioned vehicle information acquisition unit, Extract the passing vehicle information read during the period after the time the entering vehicle information was read and before the time the exiting vehicle information was read. From the extracted passing vehicle information, retrieve the passing vehicle information with the highest matching rate. The matching server according to claim 1.
The aforementioned vehicle information acquisition unit, The information of passing vehicles read by intermediate license plate readers installed in the section from the entrance toll gate where the entrance license plate reader that reads the information of entering vehicles is installed to the exit toll gate where the exit license plate reader that reads the information of exiting vehicles is installed is extracted. Obtain the vehicle information with the highest matching rate from the extracted vehicle information. The matching server according to claim 1.
The passing vehicle information acquisition unit calculates the agreement rate with the exiting vehicle information or the entering vehicle information for each of the multiple passing vehicle information entries, and acquires the passing vehicle information for which the agreement rate is equal to or greater than a predetermined agreement threshold and which has the highest agreement rate. The matching server according to claim 1.
An exit license plate reader installed at the toll booth of a toll road, An entrance license plate reader installed at the entrance toll booth of the aforementioned toll road, An intermediate license plate reader installed at a predetermined passage detection position on the aforementioned toll road, A matching server as described in any one of claims 1 to 4, A matching system equipped with the following features.
The matching server obtains exit vehicle information, including license plate information, from a vehicle exiting the toll road, which is read by an exit license plate reader installed at the exit toll gate of the toll road. The matching server obtains, from among the entering vehicle information, which includes license plate information read from vehicles entering the toll road by an entrance license plate reader installed at the entrance toll gate of the toll road, the entering vehicle information that matches the exiting vehicle information. The matching server obtains, from among the passing vehicle information, which includes license plate information read from vehicles passing through a predetermined passing detection position on the toll road by an intermediate license plate reader installed at the passing detection position, the passing vehicle information with the highest matching rate with the exiting vehicle information or the entering vehicle information. The matching server determines whether or not there is an abnormality in the intermediate license plate reader based on the matching rate, A method for detecting abnormalities in a clutch.
The steps include: obtaining exit vehicle information, including license plate information, from a vehicle exiting the toll road, using an exit license plate reader installed at the exit toll gate of the toll road; The steps include: obtaining entering vehicle information, which includes license plate information read from a vehicle entering the toll road by an entrance license plate reader installed at the entrance toll gate of the toll road, and which matches the exiting vehicle information; The steps include: acquiring passing vehicle information, which includes license plate information read from vehicles passing through a designated passing detection position on the toll road by an intermediate license plate reader installed at a predetermined passing detection position on the toll road, from among the passing vehicle information, the passing vehicle information with the highest matching rate with the exiting vehicle information or the entering vehicle information; Based on the aforementioned matching rate, the step of determining whether or not there is an abnormality in the intermediate license plate reader, A program that instructs the matching server to execute a command.

Description

This disclosure relates to a matching server, a matching system, an anomaly detection method, and a program. Toll booths at the entrances and exits of toll roads are equipped with license plate readers for the purpose of identifying and managing the types of vehicles traveling on the roads. A license plate reader comprises a camera that photographs the vehicle's license plate, lighting that illuminates the area around the license plate, and an image processing device that performs license plate reading (such as OCR processing) from the image captured by the camera. In recent years, systems have been considered that would involve installing license plate readers not only at toll booths but also on ramps connecting to main roads and other toll roads to determine the route each vehicle has taken. Furthermore, the accuracy of the license plate reader may decrease due to reasons such as dirt accumulating on the camera lens or lighting. Generally, at toll booths, the license plate reader's camera and lighting are positioned on the side of the road (roadside) at the same height as the license plate. Because the license plate reader at toll booths is relatively easy to reach, regular cleaning can be performed to prevent a decline in reading accuracy. Furthermore, if the toll booth has a roof, it is less affected by dirt from weather (rain, snow, etc.), thus further reducing the decline in reading accuracy. On the other hand, on main roads and ramps, the license plate reading cameras and lights are mounted on poles or gantry structures, capturing images of license plates and illuminating them from above the road. Because the license plate reading devices on main roads and ramps are located in hard-to-reach places, they are cleaned less frequently than those at toll booths. Furthermore, main roads and ramps often lack roofs, making them more susceptible to weather-related dirt and grime compared to toll booths. Therefore, it can be difficult to prevent a decrease in reading accuracy due to dirt on license plate reading devices on main roads and ramps. Since dirt on the lenses and lighting does not alter the electrical characteristics of the license plate reader, it is difficult to use conventional anomaly detection methods that utilize changes in internal voltage and current values. Therefore, a mechanism for detecting lens and lighting dirt is necessary, separate from hardware-based anomaly detection methods. For example, Patent Document 1 describes a dirt detection device that compares the signal outputs of a first light receiver installed in close contact with the cover (front globe) of a light fixture and a second light receiver installed at a distance from the cover. If the signal output of the second light receiver decreases compared to that of the first light receiver, it detects dirt on the light fixture cover. Japanese Unexamined Patent Publication No. 63-40203 This is a schematic diagram showing the overall configuration of a matching system according to one embodiment.Block diagram showing the functional configuration of a matching system according to one embodiment.This graph shows an example of the reading accuracy of a license plate reader according to one embodiment.This graph shows an example of the agreement rate of reading results according to one embodiment.This is a sequence diagram showing an example of the processing of a matching system according to one embodiment.This figure shows an example of entering vehicle information, passing vehicle information, and exiting vehicle information according to one embodiment.This flowchart shows an example of a matching process according to one embodiment.This is a diagram illustrating a matching process according to one embodiment. (Overall structure of the matching system) The embodiments will be described in detail below with reference to the drawings. Figure 1 is a schematic diagram showing the overall configuration of a matching system according to one embodiment. As shown in Figure 1, the matching system 1 comprises a matching server 10, an entrance license plate reader 21, an intermediate license plate reader 22, and an exit license plate reader 23. The entrance license plate reader 21 is installed on the roadside at the entrance toll booth of the toll road and reads the license plates of vehicles entering the toll road from the entrance toll booth. The intermediate license plate reader 22 is installed on the gantry at a predetermined passage detection position on the toll road and reads the license plate of a vehicle passing through the passage detection position. The passage detection position can be set at any location on the main road or ramp. For example, as shown in Figure 1, the passage detection position can be provided on at least one or both of ring roads A and B. Alternatively, the passage detection position may be provided on ramps connecting different toll roads. The exit license plate reader 23 is installed on the roadside at the exit t