JP3916319B2 - Special vehicle automatic measurement system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a special vehicle automatic measurement system, and more particularly, to a special vehicle automatic measurement system that automatically measures the dimensions of a vehicle and displays a warning of violation.
[0002]
[Prior art]
Vehicles traveling on public roads are restricted in weight, total length, and the like by laws such as the Road Traffic Law and the Vehicle Law. In particular, large trucks and special vehicles are heavy and have a long overall length, which limits the roads that can be accessed. If such a special vehicle exceeds the limit weight and travels on a general road, the road is damaged or other traffic is obstructed.
[0003]
The conventional violation vehicle detection method is a method in which the vehicle is stopped and the weight and the total length are measured, or the vehicle is measured at a low speed through a measuring instrument provided outside the road.
[0004]
[Problems to be solved by the invention]
With conventional measuring instruments and measuring methods, it is necessary to stop the vehicle once or move it at a low speed, and it is difficult to measure on a road with a lot of traffic.
[0005]
An object of the present invention is to provide a special vehicle automatic measurement system that automatically measures the dimensions of a special vehicle traveling on a general road, recognizes the vehicle number, and displays a warning in case of violation.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, in the present invention, a special vehicle automatic measurement system includes two sets of stereo cameras for measuring the vehicle length and width of a vehicle by stereo image processing, and nighttime measurement using a stereo camera. Strobe light emitting device for enabling, vehicle detector for determining shooting timing of stereo camera, axle load meter for measuring axle load, and vehicle weight measurement for measuring axle weight by integrating axle weight A vehicle height detection unit for measuring the vehicle height, a number reading unit for recognizing the vehicle number, a vehicle speed measurement, and a correspondence between the dimension measurement result and the recognition result of the number reading unit The vehicle confirmation unit for performing the operation and the information display unit for warning the violating vehicle are provided.
[0007]
With this configuration, it is possible to automatically measure the dimensions of a special vehicle traveling on a general road, recognize the vehicle number, and display a warning when the vehicle specifications violate the restrictions. it can.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The invention described in claim 1 of the present invention includes two sets of stereo cameras for photographing the front and rear of a vehicle to be measured and measuring the vehicle length and width of the vehicle by stereo image processing; A strobe light emitting device for enabling nighttime measurement by the stereo camera, a vehicle detection unit for determining shooting timing of the stereo camera, an axle load detection unit for measuring the axle load of the vehicle, A vehicle height detecting unit for measuring a first vertical cross-sectional profile to obtain a vehicle height; a vehicle weight measuring unit for measuring a vehicle weight by integrating an axial load corresponding to the first vertical cross-sectional profile; and the vehicle recognizing number reading unit and the number shooting, a second longitudinal section profile of the vehicle is measured, along with obtaining a speed of the vehicle as compared with the first longitudinal section profile, the stereo camera A vehicle confirmation unit for associating a vehicle specification measurement result by the vehicle height detection unit and the axle load measurement unit with a recognition result of the number reading unit; and the vehicle exceeds a limit for the vehicle specification It is a special vehicle automatic measurement system equipped with an information display unit for warning when there is an error, automatically measures the dimensions of the vehicle, recognizes the vehicle number, and displays a warning of violation Have.
[0009]
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG.
[0010]
(Embodiment)
In the embodiment of the present invention, two sets of stereo cameras that measure the vehicle length and width of a vehicle by stereo image processing, a vehicle detection unit for determining the shooting timing of the stereo camera, and the vehicle weight from the axial load are measured. A vehicle weight measuring unit, a vehicle height detecting unit for measuring vehicle height, a number reading unit, a vehicle checking unit for measuring a vehicle speed and confirming a target vehicle, and for warning a violation vehicle A special vehicle automatic measurement system having an information display unit.
[0011]
FIG. 1 is a schematic diagram of a special vehicle automatic measurement system according to an embodiment of the present invention. In FIG. 1, cameras 1, 2 and cameras 3, 4 are stereo cameras that photograph the front and rear of a vehicle. The strobes 5 and 6 and the strobes 7 and 8 are illumination devices for the cameras 1 to 4. The strobe power supply units 9 and 10 are power supplies for the strobes 5 to 8. The vehicle height detector 11 is an ultrasonic sensor for detecting the vehicle height. The vehicle detection unit 12 is a sensor for determining the photographing timing by detecting the detection of the front end of the vehicle. The vehicle detection unit 13 is a sensor for determining the timing of number reading. The axle load detector 14 is an axle load meter that measures the axle weight of the vehicle. The vehicle weight measurement unit 15 is a device that measures the vehicle weight from the output of the axle load detection unit 14. The vehicle confirmation unit 16 is an ultrasonic sensor similar to the vehicle height detection unit 11. The number reading unit 17 is a camera that reads a vehicle number. The recognition processing unit 18 is a device that performs character recognition processing on the number read by the number reading unit 17. The strobe power supply unit 19 is a strobe power supply for the camera of the number reading unit 17. The information display unit 20 is a device that displays a warning for a violation vehicle. The equipment operation unit 21 is an input / output device for operating the entire special vehicle automatic measurement system.
[0012]
FIG. 2 is a graph showing the output signal of the vehicle height detector 11 as a function of time. FIG. 3 is a graph showing the output signal of the axle load detector 14 as a function of time.
[0013]
With reference to FIGS. 1-3, operation | movement of the special vehicle automatic measurement system of embodiment of this invention is demonstrated. The ultrasonic sensor of the vehicle height detection unit 11 is always operated to measure the vehicle height as a function of time. As a result, a profile of the longitudinal section of the vehicle as shown in FIG. The axle load detection unit 14 is also constantly operated to measure the axle load of the vehicle as a function of time. As a result, the axle weight value as shown in FIG. The vehicle weight is obtained by integrating the peak value of the axle load corresponding to the ultrasonic profile of the vehicle. If the vehicle weight exceeds 20t, or if even one axle weight exceeds 10t, a warning is given as a violation of weight.
[0014]
When the front end of the vehicle is detected by the vehicle detector 12, the cameras 1 to 4 are photographed simultaneously. The cameras 1 and 2 and the cameras 3 and 4 constitute a stereo camera, respectively, and take a stereo photograph of the front and rear of the vehicle. In the case of nighttime, the flashes 5 to 8 are made to emit light. There is a distance of 13.7 m between the cameras 1 and 2 and the cameras 3 and 4 so that the front and rear of a vehicle with a total length of 12 m can be photographed. Vehicles with a total length shorter than 12m are not a violation, so there is no problem even if the rear part is not visible. Dimension measurement is taken only when the vehicle height detection unit 11 detects a vehicle. Do not shoot vehicles with a vehicle length much shorter than 12m. Thereby, it is possible to extend the life of the strobe light emitting device by suppressing the number of strobe light emission. In addition, since a vehicle with a total length exceeding 12 meters is a violation, it is clear that the violation is obvious when the middle part of the vehicle body is shown and the rear part is not visible. Stereo image processing is performed on the photographed front and rear stereo photographs, and the vehicle length and width of the vehicle are measured. If it is detected that the vehicle length exceeds 12m or the vehicle width exceeds 2.5m, a warning is issued.
[0015]
If any of the vehicle weight, axle load, vehicle length, or vehicle width exceeds the limit and a warning is issued, preparation for reading the number is started when the vehicle detection unit 13 detects the front end of the vehicle. The vehicle detection unit 13 is 20 m away from the vehicle detection unit 12. Select the number of vehicles with specifications exceeding the specified reference value by placing the number reading unit 17 at a fixed distance away from the specification measurement means and activating the number recognition according to the specification measurement results. Can be recognized. The profile of the longitudinal section of the vehicle body is measured by the ultrasonic sensor of the vehicle confirmation unit 16 to obtain the same profile as shown in FIG. If it matches the profile detected by the vehicle height detection unit 11, the speed is obtained from the time difference, and the number reading unit 17 is notified of the timing of number shooting. The number reading unit 17 photographs the vehicle number, the character recognition unit 18 performs character recognition, and notifies the information display unit 20 of the character recognition. In the information display unit 20, the vehicle number and the violation matter are displayed at a timing according to the speed of the vehicle and a warning is given.
[0016]
As described above, in the embodiment of the present invention, the special vehicle automatic measurement system includes two sets of stereo cameras that measure the vehicle length and width of a vehicle by stereo image processing, and the shooting timing of the stereo cameras. A vehicle detection unit, an axle load meter that measures axle load, a vehicle height detection unit that measures vehicle height, a number recognition device, a vehicle confirmation unit that measures vehicle speed, and a warning for violating vehicles Because it has a structure that includes a display board for measuring the vehicle weight and axle weight by a combination of axle load meter and ultrasonic sensor, the vehicle length and width of the vehicle traveling on a general road, Vehicle specifications such as axle load can be measured. Moreover, by starting number recognition according to the specification measurement result, it is possible to selectively recognize only the number of the vehicle having the specification exceeding the specified reference value.
[0017]
【The invention's effect】
As described above, in the present invention, the special vehicle automatic measurement system measures the vehicle length and vehicle width by performing stereo image processing on the image captured by the measurement camera, measures the vehicle height by the ultrasonic sensor, Since it is configured to measure vehicle weight and axle load by a combination of a weight gauge and an ultrasonic sensor, it is possible to measure the vehicle specifications of a vehicle traveling on a general road without stopping the vehicle. can get.
[0018]
In addition, by performing the dimension measurement imaging only when the ultrasonic sensor is detecting the vehicle, it is possible to reduce the number of times of strobe light emission and to extend the life of the strobe light emitting device.
[0019]
In addition, by placing the number recognition device at a fixed distance away from the specification measuring means, and starting the number recognition according to the specification measurement results, only the number of vehicles with specifications exceeding the specified reference value is selected. The effect that it can be made to recognize automatically is acquired.
[0020]
In addition, the vehicle speed of each vehicle can be measured by associating the waveforms of the two ultrasonic sensors. By using this vehicle speed, a warning is displayed on the display board at the optimal timing for each vehicle. The effect of being able to be obtained.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a special vehicle automatic measurement system according to an embodiment of the present invention;
FIG. 2 is a diagram showing a graph of measurement results of a vehicle height detection unit according to the embodiment of the present invention;
FIG. 3 is a diagram showing a graph of measurement results of an axial load detection unit according to the embodiment of the present invention.
[Explanation of symbols]
1-4 Camera 5-8 Strobe 9, 10, 19 Strobe power supply
11 Vehicle height detector
12, 13 Vehicle detector
14 Axle load detector
15 Vehicle weight measurement unit
16 Vehicle confirmation part
17 Number reader
18 Recognition processing section
20 Information display section
21 Device control section

Claims (1)

Two sets of stereo cameras for measuring the vehicle length and width of the vehicle by stereo image processing by photographing the front and rear of the vehicle to be measured, and the night measurement by the stereo camera A strobe light emitting device, a vehicle detector for determining the photographing timing of the stereo camera, an axle load detector for measuring the axle load of the vehicle, and a vehicle height by measuring a first longitudinal section profile of the vehicle A vehicle height detecting unit for determining the vehicle weight, a vehicle weight measuring unit for measuring the vehicle weight by accumulating the axial weight in correspondence with the first longitudinal profile, and a number reading unit for photographing and recognizing the vehicle number the second longitudinal section profile of the vehicle is measured, the with the first compared to the longitudinal sectional profile determining the speed of said vehicle, and said stereo camera and the vehicle height detecting portion and the axle load measuring unit A vehicle confirmation unit for associating the vehicle specification measurement result with the recognition result of the number reading unit, and an information display unit for giving a warning when the vehicle exceeds the limit for the vehicle specification A special vehicle automatic measurement system comprising:

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