JPH0660214A - Data code reader for high speed mobile object - Google Patents

Abstract

PURPOSE:To automatically recognize the classification, the article number, etc., of a tire at the time of rotating the tire and inspecting it by detecting automatically a data code and driving a shutter and binarizing automatically a video signal subjected to image pickup. CONSTITUTION:A two-dimensional data code B is put to the flank of a tire A being a rotating high speed object and a control part 3 sends the video signal of a camera 1 to a sub-controller 5 and in the sub-controller 5, the shutter of a CCD camera 2 is released by a signal from the camera 1. This sub- controller 5 binarizes the video signal of the camera 2 and also, sends a binarized signal in one field on a CRT screen to a controller 6 and in this controller 6, the data code is recognized. Subsequently, this signal in one field is displayed on a CRT 8. In such a manner, in the case the succeeding moving object is subjected to image pickup by the camera 1, its data are recognized continuously, inputted and decoded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system in which a high-speed object is provided with a two-dimensional data code and the code is read by an image processing apparatus.

[0002]

2. Description of the Related Art Unlike the conventional bar code, the data code developed by IDM Co., Ltd. is a code pattern that can store up to 2000 characters in a small two-dimensional image. is there. These are usually CCD camera image patterns.
Then, it is stored in the memory and read by the recognition device. Therefore, it is possible to input and decode only when the target code is in a stationary state or a state close to a stationary state.
Because the data code is a black and white binary matrix code, if the code as an image is blurred or misaligned, the code matrix structure is naturally confused and decoded. It becomes impossible. In the case of IDM's recognition device, the permissible shift width must be less than 50% per pixel, and the grayscale difference of 20% or more for black and white.

[0003]

In the case of a moving object, proper illumination is required until the object is stationary and the black-and-white ratio of the code is above a predetermined value in the memory. It is complicated and expensive. At the same time, since the reading is almost stopped, the reading takes a long time and the moving object processing process has low efficiency.

The present invention provides a device for surely reading a high-speed moving object by attaching a two-dimensional data code to the moving object so as to read the code without stopping the moving object or changing its speed. It is a thing.

[0005]

SUMMARY OF THE INVENTION The present invention is a CC for imaging a two-dimensional data code provided on a high-speed moving object.
D camera, when the data code of this camera is in the image pickup area, the data code is automatically detected, the trigger unit for driving the shutter, and the imaged video signal are automatically binarized to obtain a CRT. A device for reading a data code of a high-speed moving object, characterized in that the device is configured to extract data in one field of a screen and continuously input data to a data recognition device.

[0006]

Function: A two-dimensional data code is provided on the high-speed object. This code should be taken with a CCD camera,
When the two-dimensional data code enters the field of view of this camera, the trigger automatically operates to drive the shutter of the camera by the signal, and this code is imaged. The video signal picked up by this camera is automatically binarized and extracted in one field of the CRT screen, and when subsequent moving objects are continuously picked up by the camera, the data is continuous. Recognize and input to decipher.

[0007]

EXAMPLES In the example shown in FIG. 1, A is a tire,
A high-speed object that is rotating. B is a two-dimensional data code attached to the side surface of the tire A and has a size of 10 to 1
2mm square, about 24 characters are built in. 1 is a camera of the trigger unit, 3 is a control unit which sends the video signal of the camera 1 to the sub-controller 5, and the sub-controller 5
The shutter of the CCD camera 2 is activated by the signal from the camera 1. The CCD camera 2 has 380,000 pixels. 4 is a control device for the camera 2. The sub-controller 5 binarizes the video signal of the camera 2 and sends the binarized signal in the field of the CRT screen 1 to the controller 6, and the controller 6 recognizes the data code. Then, the CRT 8 displays this signal in one field. A CRT 7 confirms an image captured by the camera 2 of the trigger. Reference numeral 9 denotes a computer control device and a display device, which controls the controller 6 and displays data.

When a camera is used for the trigger unit, it is generally considered to employ a gyro or the like, but it is not always suitable for capturing the data code. In fact, it is difficult to input the data code with the gyrocamera currently on the market. Therefore, the shutter speed is appropriately selected from 1/2000 to 1/10000 according to the speed of the moving object. When a general CCD camera is used, since it is set to be viewed on a CRT screen as a normal image, it is necessary to take out only a specific field for being composed of 1/60 seconds × 2 / frame.

In FIG. 2, it is necessary that the data code B of the moving object tire can be reliably read within a predetermined visual field taken by the camera 3. Therefore, since the camera 1 of the trigger moves the distance l after the data code is detected, it is detected in advance according to the delay time Td to the shutter trigger, and the optical system is preliminarily read so that it can be read just when it matches the visual field of the camera 2. To place.

When the moving speed of the object changes, it is preferable to shorten the l interval so that the delay time Td can be made as small as possible.

Since the data code is recognized as a black and white pattern, it is necessary to greatly adjust the threshold value depending on the color tone of the actual illumination and the data code of the moving object and the condition of the unevenness. To solve these problems, the data on the H line immediately before is used as a reference, and the threshold value on the line is automatically set for each pixel. This method automatically adjusts even for extremely minute color tones or screens with large tendency changes in the same field.
It can be digitized and data can be recognized accurately.

Actually, the side surface of the tire has a diameter of 480 mm and a diameter of 10
Mark a mm-square data code, and use this data code as a trigger mark at a speed of one rotation in 1.8 seconds.
I was able to read the data code with the camera. In this case, the shutter speed was 1/5000 second. In addition, this data code is a halogen lamp 20W
Was irradiated at a distance of 1 m.

The trigger mark may be separately provided in addition to the data code and detected by the trigger unit.

Although the above-described embodiment is for reading the data code of the rotating tire, when the identification management of the article is carried out in the flow production process of articles other than the tire, it can be identified by this device as well.

[0015]

According to the present invention, when a tire is rotated and inspected in the tire manufacturing process, the type, product number, etc. of the tire can be automatically recognized. Not only the tire but also other flow-produced parts can be managed without stopping the flow, and the efficiency of the production process can be improved.

[Brief description of drawings]

FIG. 1 is a block system diagram showing an embodiment of the device of the present invention.

FIG. 2 is a diagram illustrating a relationship between a camera and a trigger unit.

Claims (1)

[Claims] 1. A CCD camera for picking up a two-dimensional data code provided on a high-speed moving object, and when this camera has the data code in an image pickup area, the data code is automatically detected to detect the data code of the camera. Trigger that drives the shutter
Data code of a high-speed moving object, characterized in that it is a device for automatically binarizing a captured image signal and a video signal, extracting it in one field of a CRT screen, and continuously inputting data to a data recognition device. Reader.