KR20060132235A - A system and method for recognizing standard of tires - Google Patents

Abstract

A system and a method for recognizing a standard of tires are provided to correctly and easily recognize the standard of the tires by combining a mold number recognized in a 3D(Dimensional) laser scanner and a tread color line recognized in a color recognition image system. An image processing/displaying system(1) includes an image analyzing/processing program to correctly classify the standards of the tires(5) by analyzing/processing the mold number recognized in the 3D laser scanner(2) and the tread color line recognized in the color recognition image system(3). The 3D laser scanning includes a 3D laser profile sensor for obtaining line profile data of 25 KHz(Kilo Hertz) per second, recognizes the mold number of the tire by performing scanning at an upper end of the tire while being rotated to 360‹ at a constant speed, and transmits the recognized mold number to the image processing/displaying system through an IEEE(Institute of Electrical and Electronics Engineers)-1394 interface.

Description

A system and method for recognizing standard of tires}

1 is a system configuration diagram showing a tire standard recognition system according to the present invention;

2 is a flowchart illustrating a process of recognizing and classifying tire specifications by the tire specification recognition system according to the present invention.

<Description of the symbols for the main parts of the drawings>

1 --- image processing and display system,

2 --- three dimensional laser scanner,

3 --- color recognition image system,

5 --- tires.

The present invention relates to a system and method for recognizing a tire specification, and more particularly, to a tire for recognizing a tire specification by combining a mold number recognized by a 3D laser scanner and a tread color line recognized by a color recognition image system. It relates to a standard recognition system and method.

In fact, tire specification is one of the most important factors in determining the tire manufacturer's level of automation.

Therefore, a number of methods for automatic recognition of tire specifications have been developed and tested in the field, but eventually failed to be realized due to operational problems or low reliability of the system.

In this regard, the conventional tire standard recognition method has been developed and implemented using a method using a bar code, a method of printing a separate mark on the tire, a tire surface character recognition method using a vision system, and a method using RFID. .

Recognition method using a bar code, which is one of the tire standard recognition method, is a method of attaching a label with a barcode printed on the surface of the green tire or the finished tire, and classifies the standard by reading the label with a scanner at the place where automatic classification is required to be.

However, in the recognition method using the bar code, when the bar code printed label is attached to the surface of the green tire, the scanner may not recognize the bar code due to high temperature and high pressure during vulcanization, and thus may not recognize the scanner. This problem is high, and the cost of the automatic labeling machine for the automatic barcode label is increased, and the cost is high. Because of the problem, it is causing a lot of problems in the realization.

In addition, a method of recognizing the tire by printing a separate mark is a method that the present inventors have attempted to classify the standard by placing a special mark of a braille on a mold before vulcanization and recognizing the mark using a camera. That's the way it is.

However, this method also failed to realize the method of finding the location of the marker.

In addition, the tire surface character recognition method using the vision system, the most attempted method is a method that attempts to target the dot (DOT) number, which is a character that can distinguish the standard among the characters on the tire surface.

However, the above method also seems to be easy to recognize the large size of the character, but due to the characteristics of the camera, it is not possible to create a lighting condition that is common to the tires that are sensitive to lighting and have a large number of sizes, and black protruding characters on a black background I was looking for a good picture.

Finally, the method using the RFID is a method of inserting and recognizing the RFID that can transmit and receive data wirelessly in the tire.

However, the above method also has a problem in that the tire's life is shortened due to the bonding problem between the rubber of the tire and the RFID, the recognition distance is shortened due to the interference by the tread steel belt, and the chip inserted into the tire. Due to the high cost, it was not practical.

The present invention has been made in view of the above, and tire specification recognition that can easily and easily recognize the tire specification by combining the mold number recognized by the three-dimensional laser scanner and the tread color lines recognized by the color recognition image system It is an object of the present invention to provide a system and method.

In the system for recognizing the tire specification by combining the mold number recognized by the three-dimensional laser scanner according to the present invention for solving the above problems and the tread color line recognized in the color recognition image system, the three-dimensional laser scanner Image processing and display system with built-in image analysis and processing program that can accurately classify tire specifications by analyzing and processing tire tread color line information recognized by mold number recognized by color recognition image system and 25KHz per second Built-in 3D laser profile sensor that can acquire the line profile data of the tire, scan by rotating 360 ° at a constant speed from the top of the tire to recognize the mold number of the tire, and through the IEEE 1394 interface 3-D ray sent to image processing and display system A low scanner and a color image sensor are incorporated to recognize a tread color line of a tire, and a color recognition image system for transmitting the recognized tread color line information of the tire to an image processing and display system.

In addition, a method for recognizing a tire specification by combining a mold number recognized by a three-dimensional laser scanner according to the present invention and a tread color line recognized in a color recognition image system, the three-dimensional laser embedded in the three-dimensional laser scanner Acquiring basic classification data for classifying tire specifications by a profile sensor, filtering the acquired data by a fast Fourier transform (FFT), and analyzing the filtered data to find the position of the tire mold number Comparing the tire's standard pattern by comparing the found mold number with the data stored in the database of the image analysis and processing system to find a matching mold number, and the color image sensor of the color recognition image system printed on the tire. Recognizing color lines and analyzing and processing images Analysis and processing in combination a mold number and a tread of the tire saekseon matched by the system by achieved by having the step of recognizing and classifying the size of the tire.

(Example)

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the tire specification recognition system according to the present invention is composed of an image processing and display system 1, a three-dimensional laser scanner 2, and a color recognition image system 3.

The image processing and display system 1 analyzes and processes information of a mold number recognized by the 3D laser scanner 2 and tread color lines recognized by the color recognition image system 3 to accurately determine the tire specification. There is a built-in classifying image analysis and processing program.

In addition, the three-dimensional laser scanner 2 has a three-dimensional laser profile sensor (three-dimensional high-speed profile sensor: not shown) for recognizing the mold number of the tire (5).

As shown in FIG. 1, the three-dimensional laser scanner 2 with a three-dimensional laser profile sensor capable of acquiring line profile data of 25 KHz per second rotates 360 ° at a constant speed at the top of the tire 5. do.

After the three-dimensional laser scanner 2 rotates to scan the tire surface three-dimensionally for one wheel in synchronization with an encoder (not shown), and recognizes the unique numbers of the molds stamped on both sides of the tire 5, The recognized mold number is transmitted to the image processing and display system 1.

On the other hand, the reason why the mold number is selected in the tire specification recognition system according to the present invention is that since the mold number exists in both the upper mold and the lower mold, even if the tire is turned over on the conveyor, the mold numbers on both sides can be recognized. In addition, although the size of the character is small, the resolution (8192 x 512) of the three-dimensional laser profile sensor used in the present invention is high, so that there is no obstacle in character recognition.

On the other hand, the DOT number is not present on both sides of the tire, so it is impossible to recognize it when the tire is inverted, and because it is embossed and intaglio, the letters are engraved in the mold because the letters imprinted on the aluminum plate are inserted into the mold. I have a problem.

The mold number recognized by the three-dimensional laser scanner 2 contains most of the information on the tire standard, but the standard is not classified for the standard using the common mold.

The common mold standard refers to a case in which different types of green tires are used in the same mold, and green tires are different but molds are the same mold.

In this case, however, the color tread of the tire tread of the green tire is different.

That is, a color image sensor (not shown) is built into the color recognition image system 3 according to the present invention to recognize a tread color line of the tire 5, and the recognized tread color line information is processed by an image processing and display system ( Will be sent to 1).

Finally, the tread color line information of the tire is extracted through the mold number of the tire extracted through the three-dimensional laser profile sensor of the three-dimensional laser scanner 2 and the color image detection sensor of the color recognition image system 3 as described above. By processing these mold number and color line information in the image processing and display system 1, it is possible to accurately distinguish the tire specifications.

Hereinafter, the three-dimensional laser scanner 2 will be described in detail the operation of finding the position of the mold number in many images while rotating 360 ° at a constant speed on the top of the tire (5).

First, in the tire specification recognition system of the present invention, the laser is line-projected perpendicularly to the tire to read the tire profile in order to obtain three-dimensional image data by the three-dimensional laser profile sensor made of the laser light source.

The three-dimensional laser profile sensor is installed on the upper side of the tire and can be rotated by 360 °, and acquires a synchronous image generating 8192 frames with pulse signals of an encoder of 2048 resolution installed on the sensor axis during one cycle of rotation. The image array is then converted into three-dimensional data having the surface character information of the tire.

The three-dimensional laser profile sensor is linked with the image analysis and processing system 1 by an IEEE 1394 interface, which performs processing for character recognition.

2 is a flowchart illustrating a process of recognizing tire specifications by the tire specification recognition system according to the present invention.

As shown in FIG. 2, the process of recognizing characters by the tire standard recognition system is as follows.

First, the basic classification data (profile) which can classify the specification of the tire 5 is acquired by the three-dimensional laser profile sensor built in the three-dimensional laser scanner 2 (step 100).

On the other hand, the surface image of the tire is obtained from the three-dimensional laser profile sensor, where the curved shape and the obtained image on the tire surface reflected by the laser light are digitized.

Next, the obtained data is filtered by fast Fourier transform (FFT) (step 200).

Next, the standard pattern of the tire is compared by analyzing the filtered data as described above to find the position of the tire mold number (step 300).

Next, the found mold number (letter) is compared with data previously stored in a database (not shown) of the image analysis and processing system 1 to find a matching mold number (step 400).

On the other hand, since the tire specification cannot be classified only by the mold number as described above, the color image sensor of the color recognition image system 3 as described above is printed with the tread color lines (Red, Blue, Yellow) printed on the tire 3. A process (step 400-1) is added.

Finally, by analyzing and processing by combining the mold number of the matching tire and the extracted tread color line by the image analysis and processing system 1, it is possible to finally recognize the specifications of the tire and classify them correctly ( Step 500).

As described above, according to the present invention, the tire specification is easily and accurately recognized by combining the mold number recognized by the three-dimensional laser scanner and the tread color line recognized by the color recognition image system, so that the tire specification recognition error does not occur. In addition, the operating cost and investment cost can be greatly reduced, and the three-dimensional scanning method using laser has no influence on external lighting and vibration.

Claims (2)

In the system for recognizing the tire specification by combining the mold number recognized by the three-dimensional laser scanner and the tread color line recognized in the color recognition image system, The mold number recognized by the three-dimensional laser scanner 2 and the tread color line information of the tire 5 recognized by the color recognition image system 3 are analyzed and processed to accurately classify the specifications of the tire 5. An image processing and display system (1) with built-in image analysis and processing program, Built-in three-dimensional laser profile sensor capable of acquiring line profile data of 25 KHz per second, and recognizes the mold number of the tire (5) by scanning while rotating 360 ° at a constant speed at the top of the tire (5) A three-dimensional laser scanner 2 for transmitting the mold number to the image processing and display system 1 through an IEEE 1394 interface, and A color image sensor (3) is built-in and has a color recognition image system (3) for recognizing the tread color line of the tire (5) and transmitting the recognized tread color line information of the tire to the image processing and display system (1). Tire specification recognition system, characterized in that. In the method for recognizing the tire specification by combining the mold number recognized by the three-dimensional laser scanner and the tread color lines recognized by the color recognition image system, Acquiring basic classification data capable of classifying the standard of the tire 5 by a three-dimensional laser profile sensor embedded in the three-dimensional laser scanner 2 (100); Filtering the obtained data by fast Fourier transform (FFT) (200), Comparing the standard pattern of the tire 5 by analyzing the filtered data to find the position of the tire mold number 300; Comparing the found mold number with data stored in a database of the image analysis and processing system 1 to find a matching mold number (400); A step 400-1 of recognizing a tread color line printed on the tire 3 by a color image sensor of the color recognition image system 3, And analyzing and processing the mold number of the matched tire and the tread color line by the image analysis and processing system 1 to recognize and classify the specifications of the tire 5. Method for recognizing the standard of the tire to be made.

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