JPS58140900A - Photographic apparatus for vehicle number plate - 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] This invention provides for
This invention relates to a device for photographing vehicle license plates using a television camera.

TV camera kf! Is there a camera on the road or at the edge of the road that controls the number plate of a vehicle running on the road? ! ``The TV camera was rearranged and the field of view of the TV camera was set at 1F in the a position of the vehicle, and continuous images were taken.

By the way, there are generally 3 to 4 lanes on which cars travel.
island#! It is warm, and its center position changes depending on the driving conditions inside the car. Therefore one lens thread and a television camera,
When fighting in a fj&il hée on an ice pillow, it is necessary to keep it in the single-medium range T- field of view. However, from such a wide field of view, it is difficult to take the letter T-644 on the license plate of the vehicle. However, the method of creating a fabric using a fabric called Kinmonkan was not technically feasible.

In addition, the method of using a lens thread limited to a special range [a field t-] will cause the license plate of a vehicle that is traveling to be either a car or a#IIi to come off the rt fushino, so This led to a low free kick rate.

This invention was made in consideration of the above points, and its purpose is to use a plurality of lens threads to create a car. # Covers the entire field of view and detects the driving position of the vehicle [tt] by using a photoelectric position detector, selects a lens system with the optimal field of view, and switches to a TV camera to identify the characters on the license plate. This provides a great image with a resolution that is OT-ready.

Hereinafter, an embodiment of the present invention shown in FIG. 1 will be described.

In Figure 1, (1) shows that the lens thread 1121 is the lens system Z.
+ta+ is a lens thread changer, and (4) is a television camera.

(5-13 or 5-4) A photoelectric position detector (photodiode) that detects the position of both RI and military vehicles, +6) is unidirectional, in the Ari lane, B is the field of view of lens thread 1 (1).

C is the field of view of the lens system 2 (2) and the Dri vehicle running position detection signal.

In the figure, vehicle L61? r: Ninth lens thread with a smoked edge
If you divide it into H and keep it in a positional relationship that allows you to capture the single + pA t castle as a visual field, it will be installed at the top of the single center or at the single end. Note that the field of view relationship t-[shown in Figure 2] for the valley lens thread. Photoelectric position detector (5-1) or 5-4)
is an array of photodiodes (t) for the purpose of making use of changes in the reflected light due to the passing single M (61), and the traveling position (t) of the vehicle (6) on the military aircraft is placed on the top of the single unit in order to get used to the traveling position (t) of the military aircraft. It will be installed.

A vehicle (6) running on the road is equipped with a photoelectric position 11 horizontal output device (5).
-1) or 5-4J, the vehicle (6'
), the reflected light configuration signal from the valley photodiodes carried in an array is used to output the vehicle's traveling position (t*) and generate the vehicle's traveling position common signal Dt-, and the lens system! , /l is output to the encoder (3). The lens thread changer (3) follows the vehicle traveling position according to Fukuta ID number! ! ? A or Bf is decided.

That is, switch to lens system 1 (1) or lens system 2 (2).

The result of the vehicle (6) is input to the television camera (4).

The television camera (4) performs m+intervals of jg IQ 1til via the lens thread switched by the lens thread vJ tester (3).

As described above, according to this invention, the travel distance IJ of the single circle (6)
li [depending on the vehicle travel position 1 from the photoelectric position detector (5-1) or 5-43, a lens system having the necessary field of view
Because it is switched by the detection No. 1d DIC.

It is possible to have a sharp edge in the field of view with a degree of sm that allows the identification of the characters on the license plate.

Also, there is no deviation from the field of view due to the vehicle's shifting position, and we can expect an improvement in the capturing rate of G1 as well, and the distance and operability of the vehicle's license plate captured by a TV camera are significantly improved. can be realized.

Note that the explanation above is a general explanation using two lens threads tf, but the resolution can be improved by using two or more lens threads to further divide the field of view in the single I width direction into two or more. Also, /J: 1OJ, there are methods to manipulate the number plate of multiple vehicles with 1 JIL line or more, and a method to use a light (non-formal sonic type or tape) on the position detector. It is clear that the above-mentioned effects can be obtained even in the method using the switch type switch, and there are various modifications within the $J! range without departing from the gist of the present invention.

[Brief explanation of drawings]

Figure 41 is a #If diagram showing the laugh &- of this invention. Stripe diagram 2 is a relational diagram showing the visual field relationship of the valley according to an embodiment of the present invention. In the figure (11 is the lens thread 1, t21 is the lens thread 2°, (3) is the lens thread cutter, (4) is the TV camera, (5 is
-1) or 5-43 is the photoelectric 2 position 1 ejector, (6) is the car II + 71° person is in the lane, B is the 0 of the lens system 1 (1)
Ajlif, the field of view of catz thread 2 (2), D is the vehicle running position direction jg. Note that the same or corresponding parts in the two figures are designated by the same reference numerals. ↑(11 people, only a few -

Claims (1)

[Scope of Claims] A photoelectric position detector that detects reflected light from a vehicle on a road using 7-ray Vc distributed photodiodes, and generates a starting signal indicating the position of the vehicle. the number of the vehicle); a television camera that understands;
By means of a plurality of lens threads that image the license plate IJII of the vehicle on the television camera and the detected value g of the vehicle running position from the photoelectric position detector. yktP! is equipped with a lens thread switching device that switches the plurality of lens threads to select an optimal field of view; JI with I symptoms
Ll11i+ license plate imaging device.