JP6863206B2 - Fragment analyzer, slab analysis method and program - Google Patents

Description

The present invention relates to a slab analyzer for analyzing slabs, a slab analysis method, and a program for causing a computer to execute the slab analysis method.

Conventionally, a method has been proposed in which a cross section of a slab is etched to reveal an segregated portion, and the internal quality of the slab is evaluated from the size, quantity, and the like (see, for example, Patent Document 1 below). Specifically, in Patent Document 1 below, a cross section of an etched slab is photographed, a slab cross section image is taken, and segregation of the slab is performed based on the brightness contrast in the slab cross section image. A technique for detecting the presence / absence and size is disclosed.

Japanese Unexamined Patent Publication No. 7-306161

However, the cross section of the slab may have a defect called porosity in addition to segregation, and as in the technique described in Patent Document 1, segregation is simply performed from the viewpoint of brightness contrast in the cross section image of the slab. There was a problem that it was difficult to accurately distinguish between and porosity.

The present invention has been made in view of such problems, and an object of the present invention is to provide a mechanism capable of accurately discriminating segregation and porosity in a slab.

The slab analyzer of the present invention is a slab analyzer that analyzes slabs, is a slab analyzer that analyzes slabs, and photographs a cross section of the slab that has been etched. From any one of the photographing means, the pair of lighting means arranged so as to sandwich the reference axis intersecting the cross section, and the pair of lighting means toward the intersection of the cross section and the reference axis. The cross section is photographed by the photographing means from the normal reflection direction of the illumination light to generate a first cross-sectional image, and the intersection is formed from the first illumination means of the pair of illumination means. The cross section is photographed by the photographing means from the direction along the reference axis to generate a second cross-sectional image, and the second illumination means of the pair of illumination means is used. A cross-sectional image generating means for generating a third cross-sectional image by irradiating an illumination light toward the intersection and having the photographing means photograph the cross-section from a direction along the reference axis, and the first cross-sectional image. It has a discriminating means for discriminating between segregation and porosity formed in the cross section based on the second cross-sectional image and the third cross-sectional image.
The present invention also includes a slab analysis method using the slab analyzer described above, and a program for causing a computer to execute the slab analysis method.

According to the present invention, segregation and porosity in a slab can be accurately discriminated.

It is a figure which shows an example of the schematic structure of the slab analyzer which concerns on embodiment of this invention. It is a figure which shows the embodiment of this invention and shows an example of the internal structure of the slab cross-section photographing mechanism shown in FIG. It is a figure which showed the state of the internal structure of the slab cross-section imaging mechanism shown in FIG. 2 for each imaging mode in the embodiment of the present invention. It is a figure which shows an example of the scanning (movement) of the slab cross-section imaging mechanism performed in each imaging mode shown in FIG. The first cross-sectional image, the second cross-sectional image, the third cross-sectional image and the fourth cross-sectional image generated by the cross-sectional image generation unit of FIG. 1, and the second image generated by the binarization processing unit of FIG. It is a figure which shows an example of 1 binary image and 2nd binary image. It is a flowchart which shows an example of the whole processing procedure in embodiment of this invention. It is a flowchart which shows an example of the detailed processing procedure of the slab cross-section photographing and cross-section image generation processing in step S300 of FIG. It is a flowchart which shows an example of the detailed processing procedure of the slab analysis processing in step S400 of FIG. An example showing an embodiment of the present invention is shown in a diagram showing an example of a first cross-sectional image, a second cross-sectional image, a third cross-sectional image, and a fourth cross-sectional image generated by the cross-sectional image generation unit of FIG. is there.

Hereinafter, embodiments (embodiments) for carrying out the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an example of a schematic configuration of a slab analyzer 100 according to an embodiment of the present invention. The slab analyzer 100 is an apparatus that analyzes the slab 200 (more specifically, an analysis related to segregation and porosity of the slab 200).

As shown in FIG. 1, the slab analyzer 100 according to the present embodiment includes a slab cross-sectional imaging mechanism 110, an image processing / control device 120, an input device 130, and a display device 140. There is. Further, as shown in FIG. 1, the slab analyzer 100 according to the present embodiment is communicably connected to the external device G.

First, the slab cross-sectional imaging mechanism 110 will be described.
Based on the control of the image processing / control device 120, the slab cross-section imaging mechanism 110 photographs the cross-section 201 of the etched slab while moving from the right side of the paper surface to the left side of the paper surface in the example shown in FIG. It is a shooting mechanism to do. In the present embodiment, contrary to the example shown in FIG. 1, when the slab cross-section imaging mechanism 110 is located on the left side of the slab 200, the slab cross-section imaging mechanism 110 performs image processing. Under the control of the control device 120, the cross section 201 of the etched slab is photographed while moving from the left side of the paper surface to the right side of the paper surface shown in FIG. Here, in the slab 200 shown in FIG. 1, the upper surface thereof is a cross section 201 of the slab that has been etched. In the present embodiment, the cross section 201 of the slab is photographed by moving the slab cross-section imaging mechanism 110 in a state where the slab 200 is fixed at a predetermined position and stationary.

As shown in FIG. 1, the slab cross-section photographing mechanism 110 includes a photographing device 111, an optical system 112, a first illuminating device 113, and a second illuminating device 114.

The photographing device 111 is a device that photographs a cross section 201 of the slab that has been subjected to the etching process via the optical system 112 under the control of the image processing / control device 120. Here, in the present embodiment, the photographing device 111 is, for example, a line sensor camera.

The optical system 112 is provided between the optical paths from the photographing device 111 to the cross section 201 of the slab, and the arrangement and the like are set by the image processing / control device 120 according to the photographing mode.

The first illuminating device 113 and the second illuminating device 114 are a pair of illuminating means that illuminate the photographing area photographed by the photographing device 111 under the control of the image processing / control device 120. Here, as the first lighting device 113 and the second lighting device 114, for example, a rod-shaped lighting device equipped with an LED can be used. Further, in the present embodiment, the first illuminating device 113 and the second illuminating device 114 can use an illuminating device that irradiates light of the same level of light.

FIG. 2 is a diagram showing an embodiment of the present invention and showing an example of the internal configuration of the slab cross-section imaging mechanism 110 shown in FIG. In FIG. 2, the same reference numerals are given to the configurations similar to those shown in FIG. Further, FIG. 2 is a view in which the cross section 201 of the slab shown in FIG. 1 is taken in the horizontal direction (horizontal direction).

The photographing apparatus 111 photographs the cross section 201 of the etched slab via the optical system 112. Here, in the present embodiment, as shown in FIG. 2, the optical system 112 includes a movable mirror 1121 and a fixed mirror 1122 to 1123.

The first illuminating device 113 and the second illuminating device 114, which are a pair of illuminating means, are arranged so as to sandwich the reference shaft 301 intersecting the cross section 201 of the slab. Here, in the present embodiment, an example in which an orthogonal axis orthogonal to the cross section 201 of the slab is applied as the reference axis 301 will be described. The first illuminating device 113 irradiates the illuminating light toward the intersection 302 of the cross section 201 of the slab and the reference axis 301, and in FIG. 2, the optical center axis 303 of the illuminating light is directed to the reference axis 301. On the other hand, it is shown that the angle is an oblique _{angle of θ 1.} Further, the second illumination device 114 irradiates the illumination light toward the intersection 302 of the cross section 201 of the slab and the reference axis 301, and in FIG. 2, the optical center axis 304 of the illumination light is the reference axis. It is shown that the angle is _{θ 2} with respect to 301. That is, in the present embodiment, since the first illuminating device 113 and the second illuminating device 114 are arranged so as to sandwich the reference axis (specifically, the orthogonal axis in this embodiment) 301, the slab of the slab The illumination light emitted toward the intersection 302 of the cross section 201 and the reference axis 301 is incident on the cross section 201 of the slab at an oblique angle.

Further, in FIG. 2, it is the angle θ ₂ and the angle θ ₁ that make _{the angle θ 2} of the illumination light by the second illumination device 114 _{different from the angle θ 1} of the illumination light by the first illumination device 113. If they are made equal to each other, when the illumination light emitted from the first illumination device 113 is positively reflected by the cross section 201 of the slab, it is blocked by the second illumination device 114, and a photograph is taken based on the positively reflected illumination light. This is because the device 111 cannot do it.

In FIG. 2, as an example of irradiating the illumination light from the first illumination device 113 and the second illumination device 114 toward the intersection 302, the optical central axes 303 and 304 of the respective illumination lights coincide with the intersection 302. An example is shown, but the present invention is not limited to this. For example, in the present invention, in order to irradiate the illumination light from the first illumination device 113 and the second illumination device 114 toward the intersection 302, the first illumination device 113 and the second illumination device 114 are predetermined. Even if the optical central axes 303 and 304 of the respective illumination lights do not coincide with the intersection 302 when the illumination light is irradiated with a spread, the case where the respective illumination lights are irradiated at the position of the intersection 302 is also included. It shall be.

FIG. 3 is a diagram showing a state of the internal configuration of the slab cross-section imaging mechanism 110 shown in FIG. 2 for each imaging mode in the embodiment of the present invention. In FIG. 3, the same reference numerals are given to the configurations similar to those shown in FIG.

In the shooting mode shown in FIG. 3A, the movable mirror 1121 is removed from the optical path, the second illumination device 114 is turned off, and then the first illumination device 113 is turned on to irradiate the illumination light toward the intersection 302. In this mode, the imaging device 111 photographs the cross section 201 of the slab from the specular reflection direction in which the illumination light is specularly reflected on the cross section 201 of the slab. In the present embodiment, the shooting mode shown in FIG. 3A is referred to as a “specular reflection shooting mode”. Further, in FIG. 3A, the first optical path from the illumination light emitted from the first illumination device 113 reflected (specularly reflected) on the cross section 201 of the slab to the incident on the photographing apparatus 111. It shows 310.

In FIG. 3A, as an example of causing the photographing device 111 to take a picture from the specular reflection direction of the illumination light emitted from the first lighting device 113, the optical central axis of the photographing device 111 coincides with the intersection point 302. An example is shown, but the present invention is not limited to this. For example, in the present invention, in order to cause the photographing device 111 to take a picture from the specular reflection direction of the illumination light emitted from the first lighting device 113, the optical central axis of the photographing device 111 is taken in the state shown in FIG. 3A. Is included even if the position of the intersection 302 can be photographed by the photographing apparatus 111 even if is not coincident with the intersection 302.

In the shooting mode shown in FIG. 3B, the movable mirror 1121 is inserted into the optical path, the second lighting device 114 is turned off, and then the first lighting device 113 is turned on to irradiate the illumination light toward the intersection 302. Then, in the photographing mode, the cross section 201 of the slab is photographed by the photographing device 111 from the direction along the reference axis 301. In the present embodiment, the shooting mode shown in FIG. 3B is referred to as a "first stereo shooting mode". Further, in FIG. 3B, the illumination light emitted from the first illumination device 113 is reflected (diffuse reflection (diffuse reflection)) on the cross section 201 of the slab until it is incident on the photographing apparatus 111. The optical path 320 of 2 is shown.

In addition, in FIG. 3B, as an example of causing the photographing apparatus 111 to take an image from the direction along the reference axis 301, an example in which the optical center axis of the photographing apparatus 111 coincides with the intersection 302 is shown. Is not limited to this. For example, in the present invention, in order for the photographing apparatus 111 to take an image from a direction along the reference axis 301, the optical central axis of the photographing apparatus 111 does not coincide with the intersection point 302 in the state shown in FIG. 3 (b). Also, the case where the position of the intersection 302 can be photographed by the photographing apparatus 111 is included.

In the shooting mode shown in FIG. 3C, the movable mirror 1121 is inserted into the optical path, the first lighting device 113 is turned off, and then the second lighting device 114 is turned on to irradiate the illumination light toward the intersection 302. Then, in the photographing mode, the cross section 201 of the slab is photographed by the photographing device 111 from the direction along the reference axis 301. In the present embodiment, the shooting mode shown in FIG. 3C is referred to as a "second stereo shooting mode". Further, in FIG. 3C, the illumination light emitted from the second illumination device 114 is reflected (diffuse reflection (diffuse reflection)) on the cross section 201 of the slab until it is incident on the photographing apparatus 111. The optical path 330 of 3 is shown.

In addition, in FIG. 3C, as an example of causing the photographing apparatus 111 to take an image from the direction along the reference axis 301, an example in which the optical center axis of the photographing apparatus 111 coincides with the intersection 302 is shown. Is not limited to this. For example, in the present invention, in order for the photographing apparatus 111 to take an image from a direction along the reference axis 301, the optical central axis of the photographing apparatus 111 does not coincide with the intersection 302 in the state shown in FIG. 3C. Also, the case where the position of the intersection 302 can be photographed by the photographing apparatus 111 is included.

Further, the illuminance difference stereo shooting is realized by the first stereo shooting mode shown in FIG. 3 (b) and the second stereo shooting mode shown in FIG. 3 (c). Further, as shown in FIGS. 3A to 3C, by setting the movable mirror 1121 to be inserted and removed from the optical path, shooting is performed in each shooting mode.

FIG. 4 is a diagram showing an example of scanning (movement) of the slab cross-section imaging mechanism 110 performed in each imaging mode shown in FIG. In FIG. 4, the same reference numerals are given to the configurations similar to those shown in FIGS. 1 to 3.

FIG. 4A shows an example of scanning (movement) of the slab cross-section imaging mechanism 110 in the specular reflection imaging mode shown in FIG. 3A. In the example shown in FIG. 4A, a state in which the slab cross-section imaging mechanism 110 is scanned (moved) from the right side of the paper surface to the left side of the paper surface with respect to the cross-section 201 of the slab is shown. That is, in this case, the intersection 302 of FIG. 3A showing the photographing position by the photographing apparatus 111 also moves from the right side of the paper surface to the left side of the paper surface with respect to the cross section 201 of the slab.

FIG. 4B shows an example of scanning (movement) of the slab cross-sectional imaging mechanism 110 in the first stereo imaging mode shown in FIG. 3B. The example shown in FIG. 4B is assumed to be performed after the scanning (movement) of the slab cross-section imaging mechanism 110 in the specular reflection imaging mode shown in FIG. 4A is completed. A state in which the slab cross-section photographing mechanism 110 is scanned (moved) from the left side of the paper surface to the right side of the paper surface with respect to the cross section 201 is shown. That is, in this case, the intersection 302 of FIG. 3B, which shows the imaging position by the imaging device 111, also moves from the left side of the paper surface to the right side of the paper surface with respect to the cross section 201 of the slab.

FIG. 4C shows an example of scanning (movement) of the slab cross-sectional imaging mechanism 110 in the second stereo imaging mode shown in FIG. 3C. The example shown in FIG. 4 (c) is assumed to be performed after the scanning (movement) of the slab cross-section imaging mechanism 110 in the first stereo imaging mode shown in FIG. 4 (b) is completed. A state in which the slab cross-section photographing mechanism 110 is scanned (moved) from the right side of the paper surface to the left side of the paper surface with respect to the cross section 201 of the piece is shown. That is, in this case, the intersection 302 of FIG. 3C showing the photographing position by the photographing apparatus 111 also moves from the right side of the paper surface to the left side of the paper surface with respect to the cross section 201 of the slab.

Here, the description of FIG. 1 is returned to again.
The image processing / control device 120 performs image processing of a cross-sectional image of the cross section 201 of the slab obtained by photographing by the photographing device 111, and comprehensively controls the operation of the slab analyzer 100 according to the present embodiment. To do.

As shown in FIG. 1, the image processing / control device 120 includes a cross-sectional image generation unit 121, a binarization processing unit 122, a discrimination unit 123, and a discrimination result output unit 124.

The cross-section image generation unit 121 generates a cross-section image relating to the cross-section 201 of the slab obtained by photographing with the photographing apparatus 111, and as shown in FIG. 1, the first cross-section image generation unit 1211 and the first cross-section image generation unit 121 It is configured to include a second cross-section image generation unit 1212, a third cross-section image generation unit 1213, and a fourth cross-section image generation unit 1214.

The first cross-sectional image generation unit 1211 performs imaging control in the specular reflection imaging mode shown in FIG. 3A to generate a first cross-sectional image relating to the cross section 201 of the slab. Specifically, as shown in FIG. 3A, the first cross-sectional image generation unit 1211 removes the movable mirror 1121 from the optical path, turns off the second lighting device 114, and then turns off the first lighting device 113. Is lit to irradiate the illumination light toward the intersection 302, and the photographing apparatus 111 controls to photograph the cross section 201 of the slab from the direction of normal reflection of the illumination light. Generate a cross-sectional image. A specific example of this first cross-sectional image will be described later with reference to FIG.

The second cross-sectional image generation unit 1212 performs imaging control in the first stereo imaging mode shown in FIG. 3B to generate a second cross-sectional image relating to the cross section 201 of the slab. Specifically, as shown in FIG. 3B, the second cross-sectional image generation unit 1212 inserts the movable mirror 1121 into the optical path, turns off the second lighting device 114, and then turns off the first lighting device 113. Is turned on to irradiate the illumination light toward the intersection 302, and the photographing device 111 controls to photograph the cross section 201 of the slab from the direction along the reference axis 301. Generate a cross-sectional image. A specific example of this second cross-sectional image will be described later with reference to FIG.

The third cross-sectional image generation unit 1213 performs imaging control in the second stereo imaging mode shown in FIG. 3C to generate a third cross-sectional image relating to the cross section 201 of the slab. Specifically, as shown in FIG. 3C, the third cross-sectional image generation unit 1213 puts the movable mirror 1121 in the optical path, turns off the first lighting device 113, and then turns off the second lighting device 114. Is turned on to irradiate the illumination light toward the intersection 302, and the photographing device 111 controls to photograph the cross section 201 of the slab from the direction along the reference axis 301. Generate a cross-sectional image. A specific example of this third cross-sectional image will be described later with reference to FIG.

The fourth cross-section image generation unit 1214 performs difference processing between the second cross-section image generated by the second cross-section image generation unit 1212 and the third cross-section image generated by the third cross-section image generation unit 1213. Then, a fourth cross-sectional image is generated. A specific example of this fourth cross-sectional image will be described later with reference to FIG.

The binarization processing unit 122 generates a first binary image by binarizing the first cross-sectional image generated by the first cross-sectional image generation unit 1211 using the first binarization threshold value. At the same time, the fourth cross-sectional image generated by the fourth cross-sectional image generation unit 1214 is binarized using the second binarization threshold to generate the second binary image. Specific examples of the first binary image and the second binary image will be described later with reference to FIG.

FIG. 5 shows a first cross-sectional image, a second cross-sectional image, a third cross-sectional image and a fourth cross-sectional image generated by the cross-sectional image generation unit 121 of FIG. 1, and a binarization processing unit of FIG. It is a figure which shows an example of the 1st binary image and the 2nd binary image generated in 122.

First, FIG. 5A shows the cross-sectional shape 510 of the slab, which is the surface shape of the cross-section 201 of the slab. Further, the cross-sectional shape 510 of the slab shown in FIG. 5A shows the shapes of the porosity 511 and the segregation 512. Here, the porosity 511 is, for example, a casting defect due to gas contained inside the slab 200.

As shown in FIG. 5A, both the porosity 511 and the segregation 512 have a concave shape, but the depth of the concave portion of the porosity 511 is at least several hundred μm, whereas the segregation 512 formed by etching The depth of the recess is about several tens of μm. Further, both the porosity 511 and the segregation 512 have fine irregularities in the recesses, but the parts other than the porosity 511 and the segregation 512 (hereinafter referred to as "base material portion") 513 are flattened by polishing. ing. In addition, in FIG. 5 (b) and FIG. 5 (c), the information corresponding to the cross-sectional shape 510 of the slab shown in FIG. 5 (a) is aligned in the vertical direction.

In FIG. 5B, the first cross-section image generation unit 1211 controls the cross-section 201 of the slab shown in FIG. 5A by performing the specular reflection photographing mode shown in FIG. 3A. The generated first cross-sectional image 520 is shown. In the specular reflection photographing mode shown in FIG. 3A, the illumination light normally reflected by the base material portion 513 is directly incident on the photographing apparatus 111, so that the portion of the base material portion 513 is very large in the image obtained by the photographing apparatus 111. It becomes bright (white). On the other hand, in the porosity 511 and the segregation 512, the reflected brightness of the illumination light is lowered due to the unevenness inside the recess shown in FIG. 5 (a). Therefore, in the image obtained by the photographing apparatus 111, the porosity 511 and the segregation 512 The portion becomes darker (blackish) than the portion of the base material portion 513.

Then, the first cross-sectional image generation unit 1211 corrects the brightness of the image so that the average brightness of the image obtained by the above-mentioned photographing device 111 becomes a predetermined brightness related to the intermediate color between white and black, for example. Is performed to generate the first cross-sectional image 520 shown in FIG. 5 (b). The first cross-sectional image 520 shown in FIG. 5 (b) includes an image region 521 corresponding to porosity 511 in FIG. 5 (a), an image region 522 corresponding to segregation 512 in FIG. 5 (a), and FIG. The image region 523 corresponding to the base material portion 513 of 5 (a) is shown.

Further, FIG. 5B shows a luminance graph 530 showing the luminance in the first cross-sectional image 520. The brightness graph 530 shows an example of the first binarization threshold value 531 when the binarization processing unit 122 performs the binarization processing of the first cross-sectional image 520.

Further, in FIG. 5B, the first binary value generated by the binarization processing unit 122 performing the binarization processing of the first cross-sectional image 520 using the first binarization threshold value 531. Image 540 is shown. Specifically, in the first cross-sectional image 520, the binarization processing unit 122 sets a region of the brightness value less than the first binarization threshold value 531 as black color related to one of the binary values (for example, 0). The first two is defined as a region (first region), and a region having a brightness value equal to or higher than the first binarization threshold of 531 is designated as a white region (second region) related to the other value (for example, 1) of the binary values. Generate a value image 540. In the first binary image 540, a black region (first region) 541 exists in the region corresponding to porosity 511 in FIG. 5 (a), and the black region corresponds to the segregation 512 in FIG. 5 (a). The (first region) 542 exists, and the white region (second region) 543 exists in the region corresponding to the base material portion 513 of FIG. 5 (a).

In FIG. 5 (c), the second cross-section image generation unit 1212 controls the shooting of the cross section 201 of the slab shown in FIG. 5 (a) in the first stereo shooting mode shown in FIG. 3 (b). The second cross-sectional image 550 generated by this is shown. In the first stereo shooting mode shown in FIG. 3B, the first illumination device 113 arranged on the left side of the reference axis 301 irradiates the reference axis 301 with illumination light at an oblique angle, and the reference axis 301. Since the image is taken by the photographing device 111 from the direction along the above, in the image obtained by the photographing device 111, in the porosity 511 consisting of deep recesses, the right side portion directly irradiated with the illumination light becomes bright (white) and deep. The part from the center to the left side, which is a shadow in the deep recess, becomes dark (blackish). On the other hand, the segregation 512 is not deep enough to form a shadow like the porosity 511, so that the illumination light from the first illuminating device 113 is incident inside and diffuse reflection (diffuse reflection) is caused by the unevenness inside. Therefore, the image obtained by the photographing device 111 is displayed brightly (white). Further, since the base material portion 513 has a finer roughness than the segregation 512 and is closer to a mirror surface, most of the illumination light radiated obliquely with respect to the reference axis 301 from the first illumination device 113 is regularly reflected. Since the amount of illumination light diffusely reflected (diffusely reflected) in the direction of the reference axis 301 is reduced, the image obtained by the photographing apparatus 111 is displayed slightly darker (blackish) than the segregation 512.

Then, the second cross-sectional image generation unit 1212 corrects the brightness of the image so that the average brightness of the image obtained by the above-mentioned photographing device 111 becomes a predetermined brightness related to the intermediate color between white and black, for example. To generate the second cross-sectional image 550 shown in FIG. 5 (c). In the second cross-sectional image 550 shown in FIG. 5 (c), the image region 551 corresponding to the right portion of the porosity 511 of FIG. 5 (a) and the portion from the center to the left side of the porosity 511 of FIG. 5 (a) are shown. The image region 552 corresponding to the image region 552, the image region 553 corresponding to the segregation 512 in FIG. 5 (a), and the image region 554 corresponding to the base material portion 513 in FIG. 5 (a) are shown.

Further, in FIG. 5C, in the third cross-section image generation unit 1213, the cross-section 201 of the slab shown in FIG. 5A is controlled to shoot in the second stereo shooting mode shown in FIG. 3C. The third cross-sectional image 560 generated by performing the above is shown. In the second stereo shooting mode shown in FIG. 3C, the second illumination device 114 arranged on the right side of the reference axis 301 irradiates the reference axis 301 with illumination light at an oblique angle, and the reference axis 301. Since the image is taken by the photographing device 111 from the direction along the above, in the image obtained by the photographing device 111, in the porosity 511 consisting of deep recesses, the left side portion directly irradiated with the illumination light becomes bright (white) and deep. The part from the center to the right side, which is a shadow in the deep recess, becomes dark (blackish). On the other hand, the segregation 512 is not deep enough to form a shadow like the porosity 511, so that the illumination light from the second illuminating device 114 is incident inside and diffusely reflected (diffusely reflected) by the unevenness inside. Therefore, the image obtained by the photographing device 111 is displayed brightly (white). Further, since the base material portion 513 has a finer roughness than the segregation 512 and is closer to a mirror surface, most of the illumination light radiated obliquely with respect to the reference axis 301 from the second illumination device 114 is specularly reflected. Since the amount of illumination light diffusely reflected (diffusely reflected) in the direction of the reference axis 301 is reduced, the image obtained by the photographing apparatus 111 is displayed slightly darker (blackish) than the segregation 512.

Then, the third cross-sectional image generation unit 1213 corrects the brightness of the image so that the average brightness of the image obtained by the above-mentioned photographing device 111 becomes a predetermined brightness related to the intermediate color between white and black, for example. Is performed to generate a third cross-sectional image 560 shown in FIG. 5 (c). In the third cross-sectional image 560 shown in FIG. 5 (c), the image region 561 corresponding to the left side portion of the porosity 511 of FIG. 5 (a) and the portion from the center to the right side of the porosity 511 of FIG. 5 (a) are shown. The image region 562 corresponding to the image region 562, the image region 563 corresponding to the segregation 512 in FIG. 5 (a), and the image region 564 corresponding to the base material portion 513 in FIG. 5 (a) are shown.

Further, in FIG. 5C, in the fourth cross-sectional image generation unit 1214, the second cross-sectional image 550 and the third cross-sectional image 560 are subjected to difference processing (difference between the brightness values of the two cross-sectional images is taken). The fourth cross-sectional image 570 generated by adding an intermediate value of brightness (for example, 128 when the maximum value of brightness is 255) is shown above. In the example shown in FIG. 5C, as the fourth cross-sectional image 570, a cross-sectional image generated by performing a difference process between the third cross-sectional image 560 and the second cross-sectional image 550 is shown. In the fourth cross-sectional image 570, a whitish image region 571 and a blackish image region 572 (furthermore, a neutral color image region 573 in the central portion) exist in the region corresponding to the porosity 511, and also correspond to the segregation 512. An intermediate color image region 574 exists in the region and the region corresponding to the base material portion 513. Here, in the fourth cross-sectional image 570, the region corresponding to the segregation 512 is because the image region 553 of the second cross-sectional image 550 and the image region 563 of the third cross-sectional image 560 are both whitish image regions. , The difference image will take a neutral color.

Further, FIG. 5C shows a luminance graph 580 showing the luminance in the fourth cross-sectional image 570. The brightness graph 580 shows an example of the second binarization threshold value 583 when the binarization processing unit 122 performs the binarization processing of the fourth cross-sectional image 570. Further, as shown in FIG. 5C, an upper limit threshold value 581 and a lower limit threshold value 582 are set as the second binarization threshold value 583 of the present embodiment.

Further, in FIG. 5C, the second binary value generated by the binarization processing unit 122 performing the binarization processing of the fourth cross-sectional image 570 using the second binarization threshold value 583. Image 590 is shown. Specifically, in the fourth cross-sectional image 570, the binarization processing unit 122 sets a region of the luminance value of the upper limit threshold value 581 or more or less than the lower limit threshold value 582 as black color related to one of the binary values (for example, 0). A second region is defined as a region (first region), and a region having a brightness value less than the upper limit threshold value 581 and equal to or higher than the lower limit threshold value 582 is defined as a white region (second region) related to the other value (for example, 1) of the binary values. Generate a binary image 590. In this second binary image 590, a black region (first region) 591 exists in the region corresponding to the porosity 511 of FIG. 5 (a), which corresponds to the segregation 512 and the base material portion 513 of FIG. 5 (a). There is a white region (second region) 592 in the region.

In the example shown in FIG. 5 (c), as the fourth cross-sectional image 570, the cross-sectional image generated by performing the difference processing between the third cross-sectional image 560 and the second cross-sectional image 550 is shown. The embodiment is not limited to this aspect. For example, an embodiment in which a cross-sectional image generated by performing a difference process between the second cross-sectional image 550 and the third cross-sectional image 560 is applied as the fourth cross-sectional image 570 is also applicable as the present embodiment. When this aspect is adopted, in the fourth cross-sectional image 570, the image area 571 becomes a blackish image area and the image area 572 becomes a whitish image area, contrary to the one shown in FIG. 5A. As a result, the magnitudes of the luminance values of the luminance graph 580 are also upside down, but since the upper limit threshold 581 and the lower limit threshold 582 are set as the second binarization threshold 583, the binarization processing unit 122 The second binary image generated by binarizing the fourth cross-sectional image 570 using the second binarization threshold 583 is the second binary image shown in FIG. 5 (c). It is considered to be similar to 590.

Further, in the present embodiment, the image processing / control device 120 has a first optical path 310 in the normal reflection photographing mode shown in FIG. 3A and a first optical path 310 in the first stereo photographing mode shown in FIG. 3B. It is preferable to set the optical system 112 so that the optical path lengths of the optical path 320 of 2 and the optical path length of each optical path of the third optical path 330 in the second stereo photographing mode shown in FIG. 3C are equal. By doing so, the size of the imaging target (cross-section 201 of the slab) per pixel of each cross-sectional image can be made the same.

Here, the description of FIG. 1 is returned to again.
The discrimination unit 123 includes a first cross-sectional image generated by the cross-sectional image generation unit 121, a second cross-sectional image generated by the cross-sectional image generation unit 121, and a fourth cross-sectional image based on the third cross-sectional image. Based on this, a process for discriminating between the segregation 512 formed on the cross section 201 of the slab and the porosity 511 is performed. Specifically, the discrimination unit 123 uses the first binary image based on the first cross-sectional image and the second binary image based on the fourth cross-sectional image generated by the binarization processing unit 122. Then, a process of discriminating between the segregation 512 formed on the cross section 201 of the slab and the porosity 511 is performed. The discrimination method by the discrimination unit 123 will be described with reference to FIG. The discrimination unit 123 has a black region (first) in the corresponding region of the second binary image 590 of the black region (first region) 541 and the black region (first region) 542 in the first binary image 540. If a region) exists, it is determined that the black region (first region) in the first binary image 540 has a porosity 511, and the corresponding region of the second binary image 590 is determined. When the black region (first region) does not exist in the black region (first region), it is determined that the segregation 512 is formed in the black region (first region) in the first binary image 540. In the example shown in FIG. 5, the discriminating unit 123 determines that porosity 511 is formed in the black region (first region) 541 in the first binary image 540, and determines that the porosity 511 is formed in the black region (first region) 541, and the black region in the first binary image 590. It is determined that the segregation 512 is formed in the (first region) 542, and a process for discriminating between the segregation 512 formed on the cross section 201 of the slab and the porosity 511 is performed.

Hereinafter, the description of FIG. 1 will be continued.
The discrimination result output unit 124 uses the above-mentioned discrimination result (discrimination result relating to segregation 512 of the slab 200 and porosity 511) by the discrimination unit 123 as an analysis result of the slab 200, for example, each cross-sectional image relating to the cross section 201 of the slab. At the same time, it is output to the display device 140 for display or output to the external device G.

The input device 130 inputs information from the user to the image processing / control device 120, inputs an imaging instruction in the cross section 201 of the slab, and the like. The input device 130 includes, for example, a keyboard, a mouse as a pointing device, and the like.

The display device 140 displays information and the like output from the discrimination result output unit 124 based on the control by the image processing / control device 120. Further, the external device G is configured to be able to communicate with the image processing / control device 120.

Next, the processing procedure of the slab analysis method by the slab analyzer 100 according to the embodiment of the present invention will be described.

FIG. 6 is a flowchart showing an example of an overall processing procedure according to the embodiment of the present invention.

First, in step S100, for example, a polishing device, which is a kind of external device G, polishes the cross section 201 of the slab to flatten the cross section 201 of the slab.

Subsequently, in step S200, for example, an etching treatment device which is a kind of external device G performs an etching treatment on the cross section 201 of the slab polished in step S100 using, for example, picric acid. Then, if necessary, dirt on the cross section 201 of the slab is removed by polishing.

Subsequently, in step S300, the image processing / control device 120 of the slab analysis device 100 uses, for example, a slab cross section of the slab analysis device 100 based on an imaging instruction in the cross section 201 of the slab input from the input device 130. The imaging mechanism 110 is controlled to photograph a cross section 201 of the etched slab to generate a cross-sectional image.

Subsequently, in step S400, the image processing / control device 120 of the slab analysis device 100 performs image processing on the cross-sectional image obtained as a result of the processing in step S300, and analyzes the slab 200 (more specifically, Analysis of the segregation 512 and porosity 511 of the slab 200) is performed.

Subsequently, in step S500, the image processing / control device 120 or the external device G of the slab analyzer 100 performs processing after the next step (for example, whether to roll or transfer as it is, etc.) based on the analysis result in step S400. ) Is determined.

For example, in the case of a slab 200 in which porosity 511 is present in a small amount and a small amount of segregation 512, it is unlikely that the strength will decrease due to segregation 512, and porosity 511 may disappear by rolling. It is decided to roll as it is as a process. When rolling is performed as a process after this next step, it was initially intended for products with a thick plate, but when the size of the porosity 511 is large and it is considered that the porosity 511 will not disappear in the rolling of the plate thickness. Is also applicable to decide to transfer to another thin product in which the porosity 511 is considered to disappear.
Further, for example, in the case of a slab 200 having a large number of segregation 512 and a large amount of segregation 512, the strength may be lowered due to the segregation 512. Decide to transfer to another loose product.

Further, since the cause of occurrence is different between the segregation 512 and the porosity 511, the feedback destination in the manufacturing process of the slab 200 may be determined according to the number and size of the segregation 512 and the porosity 511. ..

Next, a detailed processing procedure of the slab cross-section photographing and the cross-section image generation processing in step S300 of FIG. 6 will be described.

FIG. 7 is a flowchart showing an example of a detailed processing procedure of the slab cross-section photographing and the cross-section image generation processing in step S300 of FIG. In the description of the flowchart of FIG. 7, the shooting modes include the specular reflection shooting mode shown in FIG. 3A, the first stereo shooting mode shown in FIG. 3B, and the shooting mode shown in FIG. 3C. It is assumed that there is a second stereo shooting mode. Further, in the description of the flowchart of FIG. 7, the shooting mode settings are the specular shooting mode shown in FIG. 3 (a), the first stereo shooting mode shown in FIG. 3 (b), and the first stereo shooting mode shown in FIG. 3 (c). The mode in which the two stereo shooting modes are set in order will be described, but the present invention is not limited to this mode, and may be set in the order of other shooting modes. Further, at the start of the flowchart of FIG. 7, it is assumed that both the first lighting device 113 and the second lighting device 114 are turned off.

First, in step S301, the image processing / control device 120 sets the first shooting mode. In the present embodiment, as described above, the specular reflection shooting mode shown in FIG. 3 (a), the first stereo shooting mode shown in FIG. 3 (b), and the second stereo shooting mode shown in FIG. 3 (c). Since it is assumed that the shooting modes are set in order, here, the specular reflection shooting mode shown in FIG. 3A is set as the first shooting mode.

Subsequently, in step S302, the image processing / control device 120 determines whether or not the currently set shooting mode is the specular reflection shooting mode.

As a result of the determination in step S302, if the currently set shooting mode is the specular reflection shooting mode (S302 / YES), the process proceeds to step S303.
Proceeding to step S303, the first cross-sectional image generation unit 1211 performs a process of removing the movable mirror 1121 from the optical path as shown in FIG. 3A.

Subsequently, in step S304, the first cross-sectional image generation unit 1211 performs a process of turning on the first lighting device 113 while keeping the second lighting device 114 off.

Subsequently, in step S305, the first cross-section image generation unit 1211 scans (moves) the slab cross-section photographing mechanism 110 as shown in FIG. 4A, and scans (moves) the slab cross-section imaging mechanism 110 as shown in FIG. 3A. The illumination light is irradiated from the first illumination device 113 toward the intersection 302, and the imaging device 111 is controlled to photograph the cross section 201 of the slab from the specular reflection direction of the illumination light.

Subsequently, in step S306, the first cross-sectional image generation unit 1211 performs the above-mentioned luminance correction on the image obtained by the photographing in step S305 to generate the first cross-sectional image. Here, for example, the first cross-sectional image 520 shown in FIG. 5B is generated.

When the process of step S306 is completed, the process proceeds to step S307.
Proceeding to step S307, the image processing / control device 120 has a specular reflection shooting mode shown in FIG. 3A, a first stereo shooting mode shown in FIG. 3B, and a second stereo shooting mode shown in FIG. 3C. It is determined whether or not all the shooting modes in the stereo shooting mode have been completed. Here, since the specular reflection shooting mode shown in FIG. 3A, which is the first shooting mode, is finished, a negative determination is made.

As a result of the determination in step S307, if all the shooting modes have not been completed yet (S307 / NO), the process proceeds to step S308.
Proceeding to step S308, the image processing / control device 120 sets the next shooting mode. Here, since the specular reflection shooting mode shown in FIG. 3A, which is the first shooting mode, has ended, the first stereo shooting mode shown in FIG. 3B is set as the next shooting mode. .. Along with the setting of the first stereo shooting mode shown in FIG. 3B, a process of turning off the currently lit lighting device (here, the first lighting device 113) is also performed.

When the process of step S308 is completed, the process returns to step S302.
Here, it will be described assuming that the currently set shooting mode is the first stereo shooting mode shown in FIG. 3 (b). In this case, in step S302, it is determined that the currently set shooting mode is not the specular reflection shooting mode (S302 / NO), and the process proceeds to step S309.

Proceeding to step S309, the second cross-sectional image generation unit 1212 performs a process of inserting the movable mirror 1121 into the optical path as shown in FIG. 3 (b).

Subsequently, in step S310, the image processing / control device 120 determines whether or not the currently set shooting mode is the first stereo shooting mode. Here, since the currently set shooting mode is the first stereo shooting mode shown in FIG. 3B, a positive judgment is made.

As a result of the determination in step S310, if the currently set shooting mode is the first stereo shooting mode (S310 / YES), the process proceeds to step S311.
Proceeding to step S311, the second cross-sectional image generation unit 1212 performs a process of turning on the first lighting device 113 while maintaining the extinguishing of the second lighting device 114.

Subsequently, in step S312, the second cross-section image generation unit 1212 scans (moves) the slab cross-section photographing mechanism 110 as shown in FIG. 4 (b), as shown in FIG. 3 (b). The first illuminating device 113 irradiates the illuminating light toward the intersection 302, and the photographing device 111 controls to photograph the cross section 201 of the slab from the direction along the reference axis 301.

Subsequently, in step S313, the second cross-sectional image generation unit 1212 performs the above-mentioned luminance correction on the image obtained by the photographing in step S312 to generate a second cross-sectional image. Here, for example, the second cross-sectional image 550 shown in FIG. 5 (c) is generated.
After that, the process proceeds to step S307, but here, since the first stereo shooting mode shown in FIG. 3B, which is the second shooting mode, has ended, a negative determination is made (S307 / NO), and the step is taken. Proceeding to S308, the second stereo shooting mode shown in FIG. 3C is set as the next shooting mode. Along with the setting of the second stereo shooting mode shown in FIG. 3C, a process of turning off the currently lit lighting device (here, the first lighting device 113) is also performed.

When the process of step S308 is completed, the process returns to step S302.
Here, it will be described assuming that the currently set shooting mode is the second stereo shooting mode shown in FIG. 3C. In this case, in step S302, it is determined that the currently set shooting mode is not the specular reflection shooting mode (S302 / NO), and the process proceeds to step S309.

Proceeding to step S309, the third cross-sectional image generation unit 1213 performs a process of inserting the movable mirror 1121 into the optical path as shown in FIG. 3C.

Subsequently, in step S310, the image processing / control device 120 determines whether or not the currently set shooting mode is the first stereo shooting mode. Here, since the currently set shooting mode is the second stereo shooting mode shown in FIG. 3C, a negative determination is made.

As a result of the determination in step S310, if the currently set shooting mode is not the first stereo shooting mode (S310 / NO), it is assumed that the currently set shooting mode is the second stereo shooting mode, and the step is taken. Proceed to S314.
Proceeding to step S314, the third cross-sectional image generation unit 1213 performs a process of turning on the second lighting device 114 while maintaining the extinguishing of the first lighting device 113.

Subsequently, in step S315, the third cross-section image generation unit 1213 scans (moves) the slab cross-section photographing mechanism 110 as shown in FIG. 4 (c), and scans (moves) the slab cross-section imaging mechanism 110 as shown in FIG. 3 (c). The second illumination device 114 irradiates the illumination light toward the intersection 302, and the imaging device 111 controls the imaging device 111 to photograph the cross section 201 of the slab from the direction along the reference axis 301.

Subsequently, in step S316, the third cross-sectional image generation unit 1213 performs the above-mentioned luminance correction on the image obtained by the photographing in step S315 to generate a third cross-sectional image. Here, for example, the third cross-sectional image 560 shown in FIG. 5 (c) is generated.
After that, the process proceeds to step S307, and here, since the second stereo shooting mode shown in FIG. 3C, which is the last (third) shooting mode, is completed, a positive judgment is made (S307 / YES). .. Then, the image processing / control device 120 finishes the process of the flowchart shown in FIG. 7 after performing a process of turning off the currently lit lighting device (here, the second lighting device 114).

Next, a detailed processing procedure of the slab analysis processing in step S400 of FIG. 6 will be described.

FIG. 8 is a flowchart showing an example of a detailed processing procedure of the slab analysis processing in step S400 of FIG.

First, in step S401, the fourth cross-sectional image generation unit 1214 performs a difference processing between the second cross-sectional image generated in step S313 and the third cross-sectional image generated in step S316, and the fourth Generate a cross-sectional image. Here, for example, the fourth cross-sectional image 570 shown in FIG. 5 (c) is generated.

Subsequently, in step S402, the binarization processing unit 122 binarizes the first cross-sectional image 520 generated in step S306 using the first binarization threshold value 531 to perform the first binary processing. Generate a value image. Here, for example, the first binary image 540 shown in FIG. 5B is generated.

Subsequently, in step S403, the binarization processing unit 122 binarizes the fourth cross-sectional image 570 generated in step S401 using the second binarization threshold value 583, and performs the second binarization process. Generate a value image. Here, for example, the second binary image 590 shown in FIG. 5C is generated.

Subsequently, in step S404, segregation 512 formed on the cross section 201 of the slab using the first binary image 540 generated in step S402 and the second binary image generated in step S403. And the porosity 511 are discriminated from each other.

The discrimination method by the discrimination unit 123 in step S404 will be described with reference to FIG. The discrimination unit 123 has a black region (first) in the corresponding region of the second binary image 590 of the black region (first region) 541 and the black region (first region) 542 in the first binary image 540. If a region) exists, it is determined that the black region (first region) in the first binary image 540 has a porosity 511, and the corresponding region of the second binary image 590 is determined. When the black region (first region) does not exist in the black region (first region), it is determined that the segregation 512 is formed in the black region (first region) in the first binary image 540. In the example shown in FIG. 5, the discriminating unit 123 determines that porosity 511 is formed in the black region (first region) 541 in the first binary image 540, and determines that the porosity 511 is formed in the black region (first region) 541, and the black region in the first binary image 540. It is determined that the segregation 512 is formed in the (first region) 542, and a process for discriminating between the segregation 512 formed on the cross section 201 of the slab and the porosity 511 is performed.

After that, the discrimination result output unit 124 uses the above-mentioned discrimination result (discrimination result relating to segregation 512 of the slab 200 and porosity 511) by the discrimination unit 123 as the analysis result of the slab 200, for example, each relating to the cross section 201 of the slab. Along with the cross-sectional image, it is output to the display device 140 for display, or is output to the external device G.

When the above processing is completed, the processing of the flowchart shown in FIG. 8 is completed.

[Example]
Next, examples in the embodiment of the present invention will be described.

In the embodiment of the embodiment of the present invention, an 8192 pixel line camera was applied as the photographing apparatus 111 shown in FIG. Further, the photographing device 111 uses a lens having a focal length of 50 mm, and has an optical path length between the lens and the cross section 201 of the slab which is the subject (here, the first optical path 310 and the second optical path shown in FIG. 3). The optical path length in all the optical paths of the optical path 320 and the third optical path 330) was set to 380 mm, and the image resolution was set to 50 μm.

Further, in the embodiment of the embodiment of the present invention, in FIG. 2, the angle θ _{1 is set} to 40 ° and the angle θ _{2 is set} to 45 °. Further, as a measurement target, a slab having a cross section 201 polished and etched with picric acid for about 3 hours was used.

FIG. 9 shows an embodiment of the embodiment of the present invention, and shows a first cross-sectional image, a second cross-sectional image, a third cross-sectional image, and a fourth cross-sectional image generated by the cross-sectional image generation unit 121 of FIG. It is a figure which shows an example.

FIG. 9A shows a first cross-sectional image 910, a second cross-sectional image 920, a third cross-sectional image 930, and a fourth cross-sectional image 511 when a porosity 511 having a diameter of about 0.8 mm exists in the broken line region 901. A cross-sectional image 940 is shown. Further, FIG. 9B shows the first case where a porosity 511 having a diameter of about 0.5 mm exists in the broken line region 902 (in FIG. 9B, a plurality of porosities exist above and below). A cross-sectional image 950, a second cross-sectional image 960, a third cross-sectional image 970, and a fourth cross-sectional image 980 are shown. Specifically, in the fourth cross-sectional images 940 and 980, as described with reference to FIG. 5, porosity 511 exists in the image region including white and black.

In the first cross-sectional images 910 and 950 obtained by shooting in the specular reflection shooting mode, both the segregation 512 and the porosity 511 appear blackish as described with reference to FIG. It is difficult to distinguish between segregation 512 and porosity 511. On the other hand, as described with reference to FIG. 5, in the fourth cross-sectional images 940 and 980, the porosity 511 is represented as an image region containing white and black, whereas the segregation 512 is a neutral color image. Since it is represented as a region, the segregation 512 and the porosity 511 can be discriminated from the fourth cross-sectional image and the first cross-sectional image.

As described above, the slab analyzer 100 according to the present embodiment has a first binary image 540 generated based on the first cross-sectional image 520, a second cross-sectional image 550, and a third cross-sectional image. Using the second binary image 590 generated based on the fourth cross-sectional image 570 based on 560, the segregation 512 formed on the cross-section 201 of the slab and the porosity 511 are discriminated from each other. According to such a configuration, as described with reference to FIG. 5, segregation and porosity in the slab can be accurately discriminated.

Further, in the slab analyzer 100 according to the present embodiment, the first optical path 310 in the normal reflection photographing mode shown in FIG. 3A and the second optical path 310 in the first stereo photographing mode shown in FIG. 3B. The optical system 112 is set so that the optical path lengths of the optical path 320 and each optical path of the third optical path 330 in the second stereo photographing mode shown in FIG. 3C are equal. According to this configuration, the size of the object to be photographed (cross-section 201 of the slab) per pixel of each cross-sectional image can be made the same, so that segregation and porosity in the slab can be discriminated with higher accuracy. Can be done.

(Other embodiments)
In the above-described embodiment of the present invention, a mode of irradiating the illumination light from the first lighting device 113 at the time of shooting in the specular reflection shooting mode has been described, but the present invention is not limited to this mode. Absent. For example, the present invention also includes a mode in which the arrangement of the photographing device 111 and the optical system 112 shown in FIG. 2 is changed to irradiate the illumination light from the second lighting device 114 to perform photography in the specular reflection photographing mode. .. That is, in the present invention, imaging in the specular reflection imaging mode is performed by irradiating illumination light from any one of the first illumination device 113 and the second illumination device 114, which are a pair of illumination means. Any form may be used.

Further, in the above-described embodiment of the present invention, as shown in FIG. 4, the cross section 201 of the slab is photographed as a mode in which the slab cross-section imaging mechanism 110 and the cross section 201 of the slab are relatively moved to perform imaging. Although the mode of moving the slab cross-section imaging mechanism 110 has been described, the present invention is not limited to this mode. For example, contrary to the example shown in FIG. 4, a mode in which the cross section 201 of the slab is moved with respect to the slab cross-section imaging mechanism 110 to perform imaging is also applicable to the present invention.

Further, in the above-described embodiment of the present invention, a mode in which an orthogonal axis orthogonal to the cross section 201 of the slab is applied as the reference axis 301 has been described, but the present invention is not limited to this mode. .. In the present invention, it is preferable to apply an orthogonal axis as the reference axis 301, but if the axis intersects the cross section 201 of the slab, another axis such as an axis substantially orthogonal to the cross section 201 of the slab is applied. It is also possible to do.

The present invention is also realized by executing the following processing.
That is, software (program) that realizes the functions of the slab analyzer 100 according to the above-described embodiment of the present invention is supplied to the system or device via a network or various storage media, and the computer (or device) of the system or device is supplied. This is a process in which a CPU, MPU, etc.) reads and executes a program. This program and a computer-readable recording medium that stores the program are included in the present invention.

It should be noted that the above-described embodiments of the present invention merely show examples of embodiment in carrying out the present invention, and the technical scope of the present invention should not be construed in a limited manner by these. .. That is, the present invention can be implemented in various forms without departing from the technical idea or its main features.

100: slab analysis device, 110: slab cross-section imaging mechanism, 111: imaging device, 112: optical system, 113: first lighting device, 114: second lighting device, 120: image processing / control device, 121 : Cross-section image generation unit, 1211: First cross-section image generation unit, 1212: Second cross-section image generation unit, 1213: Third cross-section image generation unit, 1214: Fourth cross-section image generation unit, 122: Binary value Chemical processing unit, 123: Discrimination unit, 124: Discrimination result output unit, 130: Input device, 140: Display device, 200: slab, 201: Cross section of slab, G: External device, 510: Cross-sectional shape of slab , 511: Polo City, 512: Segregation, 513: Base Material, 520: First Section Image, 530: Brightness Graph, 540: First Binary Image, 550: Second Section Image, 560: Third Sectional image, 570: Fourth cross-sectional image, 580: Brightness graph, 590: Second binary image

Claims (10)

A slab analyzer that analyzes slabs.
Photographing means for photographing the cross section of the slab that has been etched, and
A pair of lighting means arranged so as to sandwich a reference axis intersecting the cross section, and
Illumination light is irradiated from any one of the pair of illumination means toward the intersection of the cross section and the reference axis, and the cross section is photographed by the photographing means from the normal reflection direction of the illumination light. A first cross-sectional image is generated, the first illuminating means of the pair of illuminating means irradiates the illuminating light toward the intersection, and the cross section is used as the photographing means from the direction along the reference axis. The image is taken to generate a second cross-sectional image, the second illumination means of the pair of illumination means irradiates the illumination light toward the intersection, and the cross section is photographed from the direction along the reference axis. A cross-sectional image generation means for generating a third cross-sectional image by causing the means to take a picture,
Fragment analysis characterized by having a discriminating means for discriminating segregation and porosity formed in the cross section based on the first cross-sectional image, the second cross-sectional image, and the third cross-sectional image. apparatus. The cross-sectional image generating means further generates a fourth cross-sectional image by performing difference processing between the second cross-sectional image and the third cross-sectional image.
The slab analysis according to claim 1, wherein the discriminating means discriminates between segregation and porosity formed in the cross section based on the first cross-sectional image and the fourth cross-sectional image. apparatus. The first cross-sectional image is binarized using the first binarization threshold to generate a first binary image, and the fourth cross-sectional image is binarized using the second binarization threshold. Further has a binarization processing means for generating a second binary image by binarization processing.
The casting according to claim 2, wherein the discriminating means discriminates between segregation and porosity formed in the cross section by using the first binary image and the second binary image. One-sided analyzer. The binarization processing means is
When the first binary image is generated, the region of the brightness value less than the first binarization threshold in the first cross-sectional image is set as the first region related to one of the binary values. In the first cross-sectional image, a region having a brightness value equal to or higher than the first binarization threshold value is defined as a second region related to the other value of the binary values.
When the second binary image is generated, an upper limit threshold value and a lower limit threshold value are set as the second binarization threshold value, and the brightness of the fourth cross-sectional image is equal to or more than the upper limit threshold value or less than the lower limit threshold value. The value region is defined as the first region relating to one of the two values, and the region of the brightness value below the upper limit threshold value and equal to or higher than the lower limit threshold value in the fourth cross-sectional image is the other value of the binary values. As the second area related to
When the first region exists in the corresponding region of the second binary image among the first region of the first binary image, the discriminating means means the first binary image. If it is determined that porosity is formed in the first region in the above and the first region does not exist in the corresponding region of the second binary image, the first region in the first binary image is formed. The slab analyzer according to claim 3, wherein it is determined that segregation is formed in the slab. The photographing means photographs the cross section via an optical system.
The cross-sectional image generating means causes the photographing means to photograph the cross-section from the normal reflection direction according to the setting of the optical system to generate the first cross-sectional image, and follows the reference axis according to the setting of the optical system. The cross section is photographed by the photographing means from the direction to generate the second cross section image, and the cross section is photographed by the photographing means from the direction along the reference axis according to the setting of the optical system. The slab analyzer according to any one of claims 1 to 4, wherein a cross-sectional image is generated. The optical system includes a movable mirror and a fixed mirror.
By setting the movable mirror to be inserted and removed from the optical path until the illumination light emitted from the first illumination means or the second illumination means is reflected by the cross section and incident on the photographing means. The slab analyzer according to claim 5, wherein the first cross-sectional image, the second cross-sectional image, and the third cross-sectional image are generated. In the photographing when generating the first cross-sectional image, in the first optical path from the reflection of the illumination light on the cross section to the incident on the photographing means, and in the photographing when generating the second cross-sectional image. The second optical path from the reflection of the illumination light on the cross section to the incident on the photographing means, and the photographing means after the illumination light is reflected on the cross section in the photographing when generating the third cross-sectional image. The slab analyzer according to claim 5 or 6, wherein the optical system is set so that the optical path lengths in each optical path of the third optical path until the light enters the light path are equal. An imaging mechanism including the photographing means and the pair of lighting means is provided.
The cross-sectional image generating means is characterized in that the first cross-sectional image, the second cross-sectional image, and the third cross-sectional image are generated while relatively moving the photographing mechanism and the cross-sectional image. The slab analyzer according to any one of claims 1 to 7. It is a slab analysis method using a slab analyzer that analyzes slabs.
The slab analyzer includes an imaging means for photographing a cross section of the slab that has been etched, and a pair of lighting means arranged so as to sandwich a reference axis intersecting the cross section.
Illumination light is irradiated from any one of the pair of illumination means toward the intersection of the cross section and the reference axis, and the cross section is photographed by the photographing means from the normal reflection direction of the illumination light. A first cross-sectional image is generated, the first illuminating means of the pair of illuminating means irradiates the illuminating light toward the intersection, and the cross section is used as the photographing means from the direction along the reference axis. The image is taken to generate a second cross-sectional image, the second illumination means of the pair of illumination means irradiates the illumination light toward the intersection, and the cross section is photographed from the direction along the reference axis. A cross-section image generation step of causing a means to take a picture to generate a third cross-section image,
Fragment analysis characterized by having a discrimination step for discriminating segregation and porosity formed in the cross section based on the first cross-sectional image, the second cross-sectional image, and the third cross-sectional image. Method. A program for causing a computer to perform each step in the slab analysis method according to claim 9.

Images