JP5330859B2 - Vehicle discrimination device and vehicle discrimination method - Google Patents

Description

  The present invention relates to a vehicle discrimination device and a vehicle discrimination method used in an automatic toll collection system provided at a toll gate exit of a toll road such as an expressway.

  Conventionally, the toll collection system has made it possible to collect tolls quickly even for vehicles with contradictory tolled ticket contents or vehicles to which non-regulated tolls have been applied. A monitoring board for a toll collection system on a toll road that can reduce the burden on the monitoring staff is known (for example, see Patent Document 1).

  This toll road toll collection system monitoring panel receives the identification number information recognized by the image processor for the vehicle arriving at the toll gate exit, the vehicle image information, and the toll collection operation image information. And the received vehicle and toll collection image information from any two of the plurality of divided screens, and the identification number information received by the monitoring panel And a monitoring panel that displays the superimpose.

JP 2003-203254 A

  By the way, as a means for detecting a passing vehicle, a tread sensor is known. The footboard type sensor is embedded in a road surface where a vehicle is to be detected, and detects the number of axles of the vehicle by detecting the position where the pressure of the vehicle weight passing above is applied. As shown in FIGS. 3 (a) and 3 (b), this tread-type sensor detects a vehicle width when detecting a vehicle type in a system that collects a toll for a vehicle. It is possible to discriminate between four or more vehicles. As with conventional toll collection system monitoring panels, vehicle discrimination by image processing increases the processing load on the system and requires high-speed image processing when the passing speed of a passing vehicle is high. There is a problem that increases. If the vehicle type can be discriminated by detecting the vehicle width by the tread-type sensor, the processing load on the system can be reduced.

  However, when the vehicle width is detected using a tread-plate type sensor, as shown in FIG. 3C, if the vehicle is deliberately derailed and travels, there is a problem that the four-wheeled vehicle is misidentified as a two-wheeled vehicle.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a vehicle determination device and a vehicle determination method that can determine whether the vehicle width measured by the vehicle width measurement means is correct or not.

  The present invention is a vehicle discriminating apparatus that discriminates a vehicle type of a vehicle passing therethrough, a vehicle width measuring unit that measures the vehicle width of the vehicle, an axis number measuring unit that measures the number of axes of the vehicle, A vehicle length measuring means for measuring the vehicle length, a storage means for storing a discrimination table in which the vehicle width, the number of axes, and the vehicle length are associated in advance, and the vehicle width measuring means with reference to the discrimination table And determining means for determining whether the vehicle width measured by the method is correct and outputting a determination result.

  The present invention further includes number information reading means for reading number information of a license plate attached to the vehicle, and the determination table associates number information in addition to the vehicle width, the number of axes, and the vehicle length. When the determination means cannot determine whether the vehicle width is correct or not, the vehicle width measured by the vehicle width measurement means based on the number information read by the number information reading means with reference to the determination table. It is characterized by determining whether or not.

  The present invention is characterized in that the vehicle width measuring means includes a tread sensor.

  The present invention provides vehicle width measuring means for measuring the vehicle width of the vehicle, axis number measuring means for measuring the number of axes of the vehicle, and measuring the vehicle length of the vehicle in order to determine the vehicle type of the passing vehicle. A computer on a vehicle discrimination device comprising a vehicle length measuring means, a vehicle width, the number of axes, and a storage means for storing a discrimination table in which a vehicle length is associated in advance. The computer includes a determination step of determining whether the vehicle width measured by the vehicle width measurement unit is correct by referring to the determination table.

  According to the present invention, since the correctness of the vehicle width measured by the vehicle width measuring means is determined, there is an effect that accurate vehicle type determination can be performed.

It is a block diagram which shows the structure of one Embodiment of this invention. It is a flowchart which shows operation | movement of the system shown in FIG. It is explanatory drawing which shows the problem of a prior art.

  Hereinafter, a vehicle discrimination device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the embodiment. In this figure, reference numeral 1 denotes a camera that captures an image of the vehicle from the rear of the passing vehicle. At least when it is detected that the vehicle has passed, a still image of the rear surface of the vehicle can be captured. Reference numeral 2 denotes a number reading unit that extracts a license plate portion of a vehicle from an image captured by the camera 1 and reads information described on the license plate by image processing. Reference numeral 3 denotes an optical sensor that detects light passing through the vehicle. Reference numeral 4 denotes a vehicle length measurement unit that measures the vehicle length of a vehicle that has passed based on output information from the optical sensor 3. Reference numeral 5 denotes a tread board sensor embedded in a road surface on which the vehicle passes. Reference numeral 6 denotes an axis number measuring unit that measures the number of axes of the vehicle based on the output information of the tread board sensor 5. Reference numeral 7 denotes a vehicle width measuring unit that measures the vehicle width (distance between left and right tires; tread) of the vehicle based on the output information of the tread board sensor 5.

  Reference numeral 8 denotes a vehicle type discriminating unit that discriminates the vehicle type of the passing vehicle based on information output from the number reading unit 2, the vehicle length measuring unit 4, the axis number measuring unit 6, and the vehicle width measuring unit 7. Reference numeral 9 denotes a discrimination table storage unit that stores a discrimination table in which a vehicle width, the number of axes, a vehicle length, and number information are associated in advance. Reference numeral 10 denotes a monitoring device for a monitoring person to visually check an image of a passing vehicle and discriminate the passing vehicle. Reference numeral 11 denotes a charging device that performs a charging process such as a toll for a passing vehicle based on the vehicle type identification information output from the vehicle type determination unit 8.

  In the apparatus shown in FIG. 1, the camera 1, the number reading unit 2, the optical sensor 3, the vehicle length measuring unit 4, the tread sensor 5, the shaft number measuring unit 6, the vehicle width measuring unit 7, the monitoring device 10 and the charging device 11. Since a known one is used, a detailed description of the configuration and operation is omitted.

  Next, the processing operation of the vehicle type discriminating unit 8 shown in FIG. 1 will be described with reference to FIG. First, the vehicle type determination unit 8 reads vehicle length information output from the vehicle length measurement unit 4, axis number information output from the axis number measurement unit 6, and vehicle width information output from the vehicle width measurement unit 7 (step S1).

  Next, the vehicle type determination unit 8 refers to the determination table stored in the determination table storage unit 9 to determine whether the read vehicle width information is correct or not, and reads the read vehicle width information, vehicle length information, and shaft. The validity of the number information is confirmed (step S2). In the discrimination table, an appropriate number of axes, a vehicle length, and number information are stored in association with each other for each vehicle width of a vehicle that can pass. The validity can be confirmed by whether the number of axes and the vehicle length related to the same vehicle width as the read vehicle width are related to a value equivalent to the read number of axes and the vehicle length.

  Next, the vehicle type determination unit 8 determines whether or not the read vehicle width is appropriate by referring to the determination table (step S3). If the result of this determination is appropriate, the vehicle type determination unit 8 determines the vehicle type based on the read vehicle width (step S6), and notifies the charging device 11 of the determined vehicle type information. Thereby, the charging process according to the vehicle type is performed in the charging apparatus 11.

  As a result of the determination, if the vehicle width is not appropriate, the vehicle type discriminating unit 8 reads the number information from the number reading unit 2, and whether or not the read number information matches the number information stored in the discrimination table. Thus, the validity of the number information is confirmed (step S4), and it is determined whether or not the read vehicle width is valid (step S5). If the result of this determination is appropriate, the vehicle type determination unit 8 determines the vehicle type based on the read vehicle width (step S6), and notifies the charging device 11 of the determined vehicle type information. Thereby, the charging process according to the vehicle type is performed in the charging apparatus 11.

  On the other hand, if the number information and the vehicle width are not valid and the vehicle type cannot be determined, the vehicle type determination unit 8 determines that the monitoring device 10 is likely to be a vehicle that has made unauthorized traffic. Then, a notice for instructing the visual discrimination of the vehicle type is given. In response to this, the monitor of the monitoring device 10 visually confirms an image obtained by imaging the passing vehicle, determines the vehicle type, and inputs the determined vehicle type information to the monitoring device 10. When the vehicle type information is input, the monitoring device 10 notifies the charging device 11 of the input vehicle type information. Thereby, the charging process according to the vehicle type is performed in the charging apparatus 11.

  As explained above, in order to confirm the validity of the vehicle width measurement results before discriminating the vehicle types such as two-wheeled vehicles and four-wheeled vehicles, vehicle feature values other than the vehicle width (number plate information reading result, number of axes) Since the measured vehicle width is confirmed to be an appropriate value from the measured value and the vehicle length measured value), it is possible to reliably discriminate between a two-wheeled vehicle and a four-wheeled vehicle. In addition, when it is determined that the vehicle width measurement value is invalid, the vehicle type can be determined from the camera image of the monitoring device because the monitoring device is notified that the vehicle type cannot be determined. .

  In addition, since license plate information can be fraudulent by changing or removing the license plate, the validity judgment based on the measurement values of the number of axles and the vehicle length is given priority. be able to.

  In addition, because license plate information is read by image processing, it takes time to read the license plate information. First, the validity of the vehicle width measurement result is evaluated based on the measured number of axes and the measured vehicle length, and the validity is confirmed. In such a case, since the vehicle type is determined based on the result, the determination time by image processing can be shortened. In addition, when the validity cannot be confirmed by the measured number of axes and the measured vehicle length, the validity is evaluated based on the license plate information, so that the discrimination accuracy can be improved.

  1 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into the computer system and executed, thereby executing vehicle determination processing. May be performed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.

  The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, what is called a difference file (difference program) may be sufficient.

  DESCRIPTION OF SYMBOLS 1 ... Camera, 2 ... Number reading part, 3 ... Optical sensor, 4 ... Vehicle length measurement part, 5 ... Tread sensor, 6 ... Axis number measurement part, 7 ... Vehicle width measuring unit, 8... Vehicle type discriminating unit, 9... Discrimination table storage unit, 10.

Claims (4)

A vehicle discriminating device for discriminating a vehicle type of a passing vehicle,
Vehicle width measuring means for measuring the vehicle width of the vehicle;
Axis number measuring means for measuring the number of axes of the vehicle;
Vehicle length measuring means for measuring the vehicle length of the vehicle;
Storage means for storing a discrimination table in which the vehicle width, the number of axes, and the vehicle length are associated in advance;
A vehicle discriminating apparatus comprising: a determination unit that refers to the determination table and determines whether the vehicle width measured by the vehicle width measurement unit is correct or not and outputs a determination result. Further comprising number information reading means for reading number information of a license plate attached to the vehicle,
In the determination table, in addition to the vehicle width, the number of axes, and the vehicle length, number information is related,
If the determination means cannot determine whether the vehicle width is correct or not, the vehicle width measurement unit measures the vehicle width measured by the vehicle width measurement unit based on the number information read by the number information reading unit with reference to the determination table. The vehicle determination device according to claim 1, wherein correctness is determined.   The vehicle discriminating apparatus according to claim 1, wherein the vehicle width measuring unit includes a tread board type sensor. Vehicle width measuring means for measuring the vehicle width of the vehicle, axis number measuring means for measuring the number of axes of the vehicle, and vehicle length measurement for measuring the vehicle length of the vehicle in order to discriminate the vehicle type of the passing vehicle A computer on a vehicle discrimination device comprising: a means, a vehicle width, the number of axes, and a storage means for storing a discrimination table in which a vehicle length is associated in advance;
The vehicle discrimination method characterized by having a determination step in which the computer determines whether the vehicle width measured by the vehicle width measurement means is correct with reference to the determination table.

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