JPH08272969A - Automatic recognizing method for slab surface marking and image pickup camera device - Google Patents

Abstract

PURPOSE: To clearly and easily input images of all slab surfaces and enable high-precision recognition by a simple means by providing a camera with a hood for lighting and picking up images of the surfaces of the slab by using this hood and lighting. CONSTITUTION: A defect mark given to a slab surface defect part formed on at least the top surface of the slab 1 manufactured by a continuous casting process or manufactured in a process from an ingot-making to a blooming process is automatically recognized by using the camera 3. In this case, an image of the entire surface of the slab 1 is picked up by the camera 3 which has the hood 100 and lighting 101, so the image of the slab surface can excellently be picked up without being affected by external light such as the sunshine and building lighting. Further, the slab 1 is turned over after the image of the top surface is picked up, and the entire reverse surface and other flanks are picked up. The picked-up images are processed and the original images and rotated images are ANDed to decide defect marks.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically recognizing a slab surface marking and an imaging camera device, and more particularly to a novel improvement for facilitating imaging when imaging the slab surface.

[0002]

2. Description of the Related Art As an example of this type of automatic slab surface marking automatic recognition method that has hitherto been used, there is a configuration shown in FIG. That is, in the configuration disclosed in FIG. 7, 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 surface of the slab is made of metal, especially after the shaving, it was extremely difficult to take a clear image due to reflection of external light such as sunlight or building lighting.

The present invention has been made to solve the above problems, and in particular, to provide an automatic slab surface marking recognition method and an imaging camera device which facilitate imaging when imaging the slab surface. With the goal.

[0005]

The slab surface marking automatic recognition method according to the present invention is capable of marking a slab surface defect portion formed on at least the surface of a slab manufactured by a continuous casting process or an ingot-casting process. In the automatic slab surface marking automatic recognition method for automatically recognizing the defect mark using a camera, a hood with illumination is provided in the camera, and the surface of the slab is imaged using the hood and illumination. .

The image pickup camera device according to the present invention is an image pickup camera device for picking up an image of a slab surface defect portion formed on at least a surface of a slab manufactured by a continuous casting process or an ingot forming process by a camera. This is a configuration including a hood provided in the camera and having a substantially box shape, and an illumination provided in the hood.

More specifically, a pair of the illuminations is provided and is provided along the longitudinal direction of the slab.

[0008]

In the slab surface marking automatic recognition method according to the present invention, since the entire surface of the slab is imaged by the camera having the hood and the lighting, the slab surface is not very affected by the external light such as sunlight or building lighting. Can be imaged.
Also, when the imaging of the surface is completed, reverse the slab,
Capture the entire back surface and the other side surface. 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.

[0009]

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 of the side surfaces 1c and 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 capturing the entire length of the front surface 1a as travel length data.
One camera for narrow surface 4 is provided for photographing c. 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. The camera 3 has a hood 100 having a substantially box shape.
0 has a width greater than the width W of the slab 1, and this hood 100
On both sides of the slab 1, there are rod-shaped lights 10 along the longitudinal direction of the slab 1.
1 is provided. Note that the illumination 101 can indirectly illuminate the surface of the slab with indirect illumination. Therefore, a good image of the slab 1 can be picked up by the illumination 101 and the hood 100.

Next, a case where the defect mark 2 is judged and recognized will be described. First, when the defect mark 2 taken in by the image processing device 8 is a triangle as shown in FIG. 2, the inside of the figure line is rotated 180 ° and 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.

[0013]

Since the slab surface marking automatic recognition method according to the present invention is configured as described above, the image of the entire slab surface can be captured extremely clearly and easily by using the camera having the hood and the illumination. 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.

2 is a specific configuration diagram showing the camera of FIG. 1. FIG.

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

FIG. 4 is a configuration diagram showing determination of a defect mark.

FIG. 5 is a flowchart for determining a defect mark.

FIG. 6 is a continuation of the flowchart of FIG. 4;

FIG. 7 is a configuration diagram showing a conventional method.

[Explanation of symbols]

 1 Slab 2 Defect mark 3 Camera 4 Narrow camera 100 Hood 101 Lighting

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

Claims (3)

[Claims] 1. A defect mark (2) marked on a slab surface defect formed on at least the surface (1a) of a slab (1) manufactured by a continuous casting process or a slab-casting process. In the slab surface marking automatic recognition method adapted to automatically recognize using a camera (3),
A hood (100) with lighting (101) is installed in (3), and this hood (10
A slab surface marking automatic recognition method characterized by imaging the surface (1a) of the slab (1) using 0) and illumination (101). 2. An imaging camera device for picking up an image of a slab surface defect portion formed on at least the surface (1a) of a slab (1) manufactured by a continuous casting process or an ingot-casting process with a camera (3). The imaging camera device according to claim 1, further comprising a hood (100) provided in the camera (3) and having a substantially box shape, and an illumination (101) provided in the hood (100). 3. The image pickup camera device according to claim 2, wherein one pair of the illuminations (101) are provided along the longitudinal direction of the slab (1).