JPH08271210A - Method for automatically recognizing marking on slave surface - Google Patents

Abstract

PURPOSE: To recognize a defect mark by picking up the entire surface of a slab with a wide-surface camera, picking up one side surface with a narrow- surface camera, inverting the slab, and picking up the entire reverse side and the other side surface, and performing the image processing of each image. CONSTITUTION: A worker places a defect mark on a surface 1a, a reverse side 1b, and side surfaces 1c and 1d of a slab 1 with a white chalk. A wide- surface camera 3 with the total length as its visual field is provided at the upper portion of the surface 1a, and a narrow-surface camera 4 with the side surface 1c as its visual field is provided. The slab 1 is placed on a solvent truck 5 and can be inverted and a driving pulse signal 7 of an encoder mounted to a wheel 6 is inputted to an image processing device 8 along with the image signals of the cameras 3 and 4. For example, the triangle, circle, and square, etc., of the defect mark 2 are recognized while inverting the slab 1. A position signal 8a indicating the position and type of a scratch from the device 8 is inputted to a partial input device for treating the slab 1 with a solvent and a recognition signal from the device 8 is printed by a printer 21 via a personal computer 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic slab surface marking recognition method, and more particularly to the entire front and back surfaces of a slab using one wide surface camera and each side surface using one narrow surface camera. The present invention relates to a new improvement for recognizing a defect mark of.

[0002]

2. Description of the Related Art As a conventional slab surface marking automatic recognition method of this type that has been conventionally used, for example, the configuration shown in FIG. That is, in the configuration disclosed in FIG. 6, seven mark detectors (cameras) provided on the half-gate crane 40.
Is used to detect the defect mark 2 from the front surface 1a side of the slab 1 and correct a plurality of images taken from each camera 3 into one image, thereby processing the image of the entire front surface 1a or the entire back surface 1b. It was processed by 20 and obtained by the personal computer 21.

[0003]

Since the conventional automatic slab surface marking recognition method is configured as described above, the following problems exist. That is, since the image of the entire surface of the slab was obtained by modifying the multiple images obtained by multiple cameras (7 units) into one image, it is extremely difficult to modify the multiple images into one image. Therefore, the image processing requires a lot of cost and time.

The present invention has been made in order to solve the above problems, and in particular, a slab in which the defect marks on the entire front surface side and the entire rear surface side of the slab are recognized by using one camera. It is an object to provide an automatic recognition method for surface marking.

[0005]

A method for automatically recognizing a slab surface marking according to the present invention is a slab surface defect formed on a front surface, a back surface, or a side surface of a slab manufactured by a continuous casting process or a slab-casting process. In a slab surface marking automatic recognition method for automatically recognizing a defect mark marked on a part with a camera, the entire surface of the slab is taken with one wide surface camera and one side surface with a narrow surface camera, It is a method of inverting the slab and taking images of the entire back surface and the other side surface, and image-processing each of the images to recognize the defect mark.

[0006]

In the slab surface marking automatic recognition method according to the present invention, the entire surface of the slab is photographed by one wide surface camera and the entire surface is taken, and one side surface is taken by the narrow surface camera, and then, Invert the slab to capture the entire backside and the other side, capturing the image of the entire slab. The captured image is subjected to image processing, and the rotated image obtained by rotating the original image with respect to the original image is subjected to AND processing to determine a defect mark.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the slab surface marking automatic recognition method according to the present invention will be described in detail below with reference to the drawings. In FIG. 1, reference numeral 1 is a long plate-shaped slab manufactured by a continuous casting process or a slab-casting process. The slab 1 has a front surface 1a and a back surface 1b.
Further, on each side surface 1c, 1d, a defect mark 2 of a slab surface defect portion marked by an operator is formed by white chalk. Above the front surface 1a of the slab 1, there is provided one wide surface camera 3 capable of photographing the entire length of the front surface 1a as travel length data, and one side surface 1c thereof.
One narrow surface camera 4 is provided to capture the image. The slab 1 is mounted on the fusing trolley 5 and is configured so that it can be inverted by hand means (not shown). An encoder (not shown) provided on a wheel 6 of the fusing trolley 5 ) Traveling pulse signal 7
The image signals of the cameras 3 and 4 are input to the image processing device 8. The position signal 8a for transmitting the position and type of the flaw from the image processing device 8 is input to the partial care device 10 for performing the fusion cutting process on the slab. A recognition signal from the image processing device 8 is printed by the printer 21 via the personal computer 20.

Next, a case where the defect mark 2 is judged and recognized will be described. First, when the defect mark 2 captured by the image processing device 8 is a triangle as shown in FIG. 2, the inside of the figure line is filled and rotated by 180 ° to be AND-processed to form a rhombus, and the triangle is recognized. Further, in the case of a round shape, even if the figure line is rotated 180 ° and the AND processing is performed, the round shape is recognized as a round shape.

In addition, as shown in FIG.
When it is rotated by 0 ° and ANDed, it becomes a round shape. Also, if the triangular figure line is rotated 180 ° and ANDed, it becomes a diamond-shaped point and the triangle is recognized. In addition, in the case of a rectangle,
Even if the figure line is rotated by 180 ° and ANDed, it is a quadrangle, so the quadrangle is recognized.

The above-mentioned recognition processing is performed by the flow chart shown in FIG. 4 as an example. That is, the length of the object including the defect mark 2 is determined (first step 100), the area of the object is determined (second step 101), the number of protrusions (third step 102), and the number of lines (first step). 4 step 1
03), the line width difference is determined (fifth step 104), and the T-shape is determined (sixth step 105) to recognize the I-shape. Also, the aspect ratio determination (seventh step 106), 18
A circle or a triangle can be recognized by determining 0 ° rotation (eighth step 107) and tangential length determination (ninth step 108). It was also rotated 45 ° (10th
In the case of step 109), if the difference is small as shown in FIG. 5, a circle is recognized and the number of contact points is judged (11th step 11th step).
After 0), a circle is recognized below the set value, and a square is recognized above the set value. Note that this determination method can also be performed by coordinate detection.

[0011]

Since the slab surface marking automatic recognition method according to the present invention is configured as described above, it is possible to capture an image of all slab surfaces by using one set of wide surface camera and narrow surface camera. Highly accurate recognition can be performed by an extremely simple means.

[Brief description of drawings]

FIG. 1 is a block diagram showing an automatic slab surface marking recognition method according to the present invention.

FIG. 2 is a configuration diagram showing determination of a defect mark.

FIG. 3 is a configuration diagram showing determination of a defect mark.

FIG. 4 is a flowchart for determining a defect mark.

FIG. 5 is a flowchart showing a continuation of FIG. 4;

FIG. 6 is a configuration diagram showing a conventional method.

[Explanation of symbols]

 1 Slab 2 Defect mark 3 Wide surface camera 4 Narrow surface camera 1a Front surface 1b Rear surface 1c Side surface 1d Side surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takayuki Shima 11-11 Showa-cho, Kure-shi, Hiroshima Nisshin Steel Co., Ltd. Kure Works

Claims (1)

[Claims] 1. A defect mark marked on a slab surface defect formed on the front surface, back surface, or side surface of a slab (1) manufactured by a continuous casting process or a slab-casting process.
In the slab surface marking automatic recognition method in which (2) is automatically recognized by the camera, the surface (1
a) Take the whole one camera (3) for wide surface and one side (1c) with the camera (4) for narrow surface, reverse the slab (1) and reverse the whole back surface (1b) and the other A slab surface marking automatic recognition method characterized by taking an image of a side surface (1d) and image-processing each of the images to recognize the defect mark (2).