JPS61216097A - Shape recognition equipment for object - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an apparatus for recognizing the shape of a moving object such as a vehicle.

[Technical background of the invention and its problems] For example, there are systems that automatically identify vehicle types at entrances to toll roads.

Conventional vehicle type identification is performed by obtaining one-dimensional vehicle information (height 0 width'! 4) using a side detection unit installed on the side of the vehicle's path and a road detection unit placed on the road. was.

However, this one-dimensional information alone is not sufficient to distinguish the type of vehicle, and there is a risk of erroneously distinguishing between a bus and a truck, for example.

[Object of the Invention] The present invention has been made in view of the above circumstances, and provides a shape of an object that allows the shape of the object to be recognized from information obtained when the object passes, and allows accurate identification of vehicle type, etc. The purpose is to provide a recognition device.

[Summary of the Invention] A summary of the present invention for achieving the above object includes: a one-dimensional detector that is placed in the middle of the movement path of the object and detects an object passing at a plurality of locations along the height direction of the object; a speed detection means for detecting the speed at which the object is moving; a clock generator for generating a clock; The shape of the object is determined by creating two-dimensional information regarding the height direction and moving direction of the object, and correcting the information regarding the length in the moving direction based on the output of the front speed polishing detection means. The invention is characterized in that it has a shape recognition means that recognizes the shape of the object.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a schematic perspective view showing an example of the arrangement of detectors, Fig. 2 is a block diagram of the shape aS device, Fig. 3 is a schematic explanatory diagram of a one-dimensional detector, and Fig. 4 is a schematic explanatory diagram of a speed detector. It is.

In FIG. 1, a one-dimensional detector 5 consisting of a light-emitting element group 3 and a light-receiving element group 4, which are arranged opposite to each other across the traveling path 2, is disposed in the middle of the traveling path 2 of the vehicle 1, and A road surface detector 6 is arranged on the road 2. Also, this one-dimensional detection! ! A speed detector 10 is disposed at one end of the traveling path 2 in the width direction at a position spaced ahead of the set position 15.

The shape recognition device of the vehicle 1, as shown in FIG.
The one-dimensional detector5. A calculation unit 3 which is a shape recognition means into which the outputs of the speed detector 10 and the clock generation circuit 20 are input.
Consists of 0.

The light emitting element group 3 in the one-dimensional detector 5 is composed of a plurality of light emitting diodes 3A connected in series along the height direction of the vehicle 1, as shown in FIG. Further, the light receiving element group 4 is composed of each photodiode 4A arranged opposite to each of the light emitting diodes 3A, and an amplifier 4B that amplifies and outputs the output of each of the photodiodes 4A. In addition, the amplifier 4 on the upper end side in the height direction of the vehicle 1
The output from B is 81, and the outputs of each amplifier 4B below this are 82, 83, and 34, respectively.

The speed detector 10 detects speed using, for example, the Doppler effect, and includes an ultrasonic oscillator 11 that emits ultrasonic waves to the vehicle 1, as shown in FIG. It is comprised of an ultrasonic receiver 12 that receives this reflected echo, and a phase comparison circuit 13 that compares the phases of the ultrasonic waves from the ultrasonic oscillator and receiver 11.12 to detect the speed.

The operation of the apparatus configured as above will be explained with reference to FIG. 5.

For example, when a vehicle 1 having a side profile as shown in FIG. 5 passes the one-dimensional detector 5, the light from the light emitting diode 3A facing the lower end of the vehicle 1 is blocked and the signal S4 is turned ON. Then, as the vehicle 1 passes, the light of the light emitting diode 3A is blocked in order from the lower end of the vehicle 1, and the signals S3 and S8 are blocked.
2.31 becomes ON. Further, as the traveling edge side of the vehicle 1 passes through the one-dimensional detector 5, the light from the light emitting diodes 3A is sequentially received by the photodiode 4A from the upper end side in the height direction of the vehicle 1, and the signals S1. S2゜S3.34
It turns off in this order.

FIG. 5 shows a state in which the ON and OFF states of each of the signals 81 to S4 are sampled using the clock from the clock generator 20, with the horizontal axis as the time axis T. Two-dimensional information about the vehicle 1 can be obtained by connecting the rising or falling points of each of the signals 81 to S4 in the ON and OFF states along the time axis T with a continuous line.

The two-dimensional information obtained in this way is related to the same vehicle type, and varies depending on the speed of the vehicle. That is, the passing time t of the vehicle shown in FIG. 5 is inversely proportional to the vehicle speed.

Therefore, in this embodiment, the speed of the vehicle 1 is detected by the speed detector 10, and the length in the moving direction of the two-dimensional information is corrected based on this speed information. If the speed is ■, then the vehicle length can be found as ■·t, and by correcting the two-dimensional information according to this length, it is possible to recognize the shape corresponding to the side shape of the vehicle 1.

In this way, by recognizing the shape of the vehicle 1, the accuracy of vehicle type identification is greatly improved. In this embodiment, since the road surface detector 6 detects the number of tires, the number of axles, the distance between axles, etc. of the vehicle 1, the accuracy can be further improved.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the gist of the present invention. The present invention is not limited to being used to recognize the shape of a running vehicle, but can be applied to shape recognition of various objects other than vehicles by moving the object so as to pass through a one-dimensional detector. In addition, the speed detection means is not limited to one that utilizes the Doppler effect, and various methods may be applied, such as detecting the leading and trailing ends of an object and determining the speed from the time and length between them. Can be done. Furthermore, if the one-dimensional detector 5 is placed not only on both sides of the moving route but also above and below the moving route, the three-dimensional shape of the object can also be measured.

(Effects of the Invention) As described above, according to the present invention, it is possible to provide an object shape recognition device with a simple configuration that can recognize the shape of an object without contact from information obtained when the object passes. Therefore, if the present invention is applied to vehicle type discrimination, it is possible to accurately discriminate the vehicle type based on the difference in shape.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view showing an example of the arrangement of detectors, Fig. 2 is a block diagram of the shape recognition device, Fig. 3 is a schematic explanatory diagram of a one-dimensional detector, and Fig. 4 is a schematic explanatory diagram of a speed detector. , Figure 5 shows the shape i! ! FIG. 2 is a schematic explanatory diagram for explaining a recognition action. DESCRIPTION OF SYMBOLS 1... Object, 5... One-dimensional detector, 10... Speed detection means, 20... Clock generator, 30... Shape recognition means. □Kokancho

Claims (1)

[Claims] a one-dimensional detector that is placed along the movement path of the object and detects the object passing at multiple locations along the height direction of the object;
a speed detection means for detecting the moving speed of the object; a clock generator for generating a clock; and a clock generator for sampling the output of the one-dimensional detector in each height direction using a clock from the clock generator. Shape recognition means for creating two-dimensional information regarding the height direction and the moving direction, and correcting the information regarding the length in the moving direction based on the output of the speed detecting means to recognize the shape of the object. An object shape recognition device featuring: