JP7149752B2 - Slab photographing device, slab photographing method and program - Google Patents

Description

TECHNICAL FIELD The present invention relates to a slab imaging apparatus and slab imaging method for imaging a slab sample taken from the slab for evaluation of the slab, and a program for causing a computer to execute the slab imaging method. It is.

Conventionally, in order to evaluate the slab, a cross section of a slab sample taken from the slab is etched to reveal segregation, and a photograph obtained by photographing the cross section of the slab sample that has been subjected to the etching treatment. Techniques for evaluating the internal quality of cast slabs using images have been proposed. For example, in Patent Document 1, when the cross section of a slab sample is photographed with a line sensor camera as a photographing means, the line sensor camera and the cross section (photographing surface) of the slab sample are kept parallel at a constant distance. Arrangements are disclosed for aligning an imaging mechanism, including a line sensor camera, for scanning.

JP 2014-174045 A

As a camera for photographing the cross section (photographing surface) of a slab sample, a line sensor camera is usually used as in Patent Document 1, but it is difficult to install an autofocus function in the line sensor camera, and the focus is fixed. . Therefore, when the line sensor camera and the imaging surface of the slab sample are relatively moved and scanned, it is necessary to keep the line sensor camera and the imaging surface of the slab sample parallel at a constant distance. There is

FIG. 1 is a diagram for explaining a slab sample 210. FIG.
As shown in FIG. 1, a slab sample 210 is obtained by cutting a slab 200 produced by continuous casting into a plate-like shape perpendicular to the casting direction. Consider the case where the first plane 211 is used as the photographing plane. In this case, the first surface 211 of the slab sample 210 faces upward, and scanning is performed by horizontally moving the line sensor camera above it.

At this time, since the slab sample 210 is collected from the slab 200 by gas cutting or the like, its cross section has rough irregularities. Here, the first surface 211, which serves as the imaging surface, is generally machined flat and then etched with an etchant, so that the first surface 211 has a relatively high degree of flatness. However, the second surface 212, which is the other cross section of the slab sample 210 on the side opposite to the first surface 211, is usually left as it is after gas cutting or the like. Therefore, when the second surface 212 of the slab sample 210 is placed on the floor or the like, the first surface 211, which is the photographing surface, is tilted from the horizontal, and the line sensor camera and the first surface 211 of the slab sample 210 are parallel. may not be It is conceivable to machine the second surface 212 of the slab sample 210 in addition to the first surface 211 into a flat surface. It is difficult to apply in the steel industry that evaluates 200.

In addition, the thickness t of the slab sample 210 may not be constant. If the thickness t is not constant when the slab sample 210 is collected in this way, for example, if the height position of the line sensor camera is fixed, the line sensor camera and the slab sample 210 are photographed on the first surface. The distance to 211 also varies.

In consideration of this point, in Patent Document 1, in order to keep the distance between the line sensor camera, which is an imaging means, and the imaging surface of the slab sample 210 constant, the slab sample 210 is positioned at a plurality of positions on the imaging surface of the slab sample 210. With the positioning tool installed, a post mechanically connected to the photographing mechanism including the line sensor camera is fixed to the floor to adjust the position of the photographing mechanism.

However, in the configuration described in Patent Document 1, positioning tools are installed at a plurality of positions on the imaging surface of the slab sample 210, so the imaging surface may be scratched or foreign matter may adhere to the imaging surface. As a result, it is difficult to acquire an appropriate captured image that contributes to the evaluation of the internal quality of the cast slab 200 .

Furthermore, in the configuration described in Patent Document 1, the position of the photographing mechanism including the line sensor camera is adjusted based on the photographing surface of the slab sample 210, so the position of the photographing mechanism is adjusted each time the slab sample 210 changes. Adjustments will also be made. Since the photographing mechanism includes precision optical equipment such as a camera, if the position of the photographing mechanism is adjusted each time the cast slab sample 210 changes, the optical equipment included in the photographing mechanism will not be subject to disturbance such as vibration. There is a possibility that the optical axis, etc., may be shifted due to this. As a result, when a large number of slab samples 210 are photographed, the quality of the photographed images deteriorates, making it difficult to stably and continuously evaluate the internal quality of the slab 200 .

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 acquiring an appropriate photographed image that contributes to the evaluation of the internal quality of a cast slab.

A slab photographing apparatus of the present invention is a slab photographing apparatus for photographing a slab sample taken from a slab for evaluation of the slab, and is photographing means for photographing a first surface of the slab sample. illuminating means for illuminating the focal plane of the photographing means; and a plurality of supporting points of three or more points on the second surface, which is the back surface of the first surface of the cast slab sample. and a position for measuring the position of the first surface by measuring the positions of the plurality of points on the first surface corresponding to the plurality of points on the second surface. and control to drive and control the support means so that the first surface is arranged on the in-focus plane based on the measurement results of the positions of the plurality of points on the first surface by the position measurement means. wherein the control means uses the measurement result of the position measuring means as the driving control to determine the shortest distance from the focal plane among the plurality of points on the first surface. A reference point is extracted, and the support member that supports other points of the plurality of points on the second plane excluding the corresponding point corresponding to the reference point is driven to move the focal plane to the focal plane. driving the plurality of support members that support the corresponding points and the other points on the second surface using a first drive control that makes the first surface parallel and the measurement result of the position measuring means; and a second drive control for matching the first plane with the in-focus plane.
Further, the present invention includes a cast piece photographing method using the cast piece photographing apparatus described above, and a program for causing a computer to execute the cast piece photographing method.

ADVANTAGE OF THE INVENTION According to this invention, the suitable photography image which contributes to evaluation of the internal quality of a slab can be acquired.

It is a figure for demonstrating a slab sample. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows an example of schematic structure of the cast piece imaging device which concerns on embodiment of this invention. 4 is a flow chart showing an example of a processing procedure of a cast piece photographing method by the cast piece photographing apparatus according to the embodiment of the present invention. FIG. 2 is a schematic diagram showing an example of a processing procedure of a cast piece photographing method using the cast piece photographing apparatus according to the embodiment of the present invention;

EMBODIMENT OF THE INVENTION Below, the form (embodiment) for implementing this invention is demonstrated, referring drawings.

FIG. 2 is a diagram showing an example of a schematic configuration of the cast piece photographing apparatus 100 according to the embodiment of the present invention. This slab photographing apparatus 100 is an apparatus for photographing a slab sample 210 taken from the slab 200 shown in FIG. 1 in order to evaluate the slab 200 . In the slab sample 210 shown in FIG. 2, the same reference numerals are assigned to the same configurations as those shown in FIG. That is, the first surface 211 of the slab sample 210 is a cross section subjected to etching treatment and is a cross section corresponding to the photographing surface to be photographed by the slab photographing apparatus 100, and the second surface 212 of the slab sample 210. is the other cross section, which is the back surface of the first surface 211 .

As shown in FIG. 2, the cast piece imaging apparatus 100 according to the present embodiment includes an imaging mechanism 110, a support mechanism 120, a position measuring section 130, a processing/controlling section 140, an input section 150, and a display section 160. is configured with Also, in FIG. 2, the vertical direction is the Z direction, and the laying direction of two rails laid in the horizontal direction perpendicular to the vertical direction is the Y direction. An XYZ coordinate system in which the direction of moving (scanning) is the X direction.

First, the imaging mechanism 110 will be described.
Under the control of the processing/control unit 140, the imaging mechanism 110 moves, for example, from the right side of the paper surface to the left side of the paper surface in the X direction shown in FIG. It is a mechanism for shooting. In this embodiment, the first surface 211 of the slab sample 210 is photographed by moving the imaging mechanism 110 while the slab sample 210 is fixed and stationary. It is not limited to this form. For example, a configuration in which the first surface 211 of the slab sample 210 is photographed by moving the slab sample 210 with the imaging mechanism 110 fixed and stationary is also applicable to the present invention. The photographing mechanism 110 includes a photographing section 111 and an illumination section 112 as shown in FIG.

The photographing unit 111 is a component that photographs the first surface 211 of the etched slab sample 210 under the control of the processing/control unit 140 . Here, in this embodiment, the imaging unit 111 is, for example, a line sensor camera. FIG. 2 also shows an example of a focus position 1111 of the imaging unit 111 when the imaging mechanism 110 is at the position shown in FIG. ), an example of the in-focus plane 1112 of the image capturing unit 111 is shown. In this case, since the imaging mechanism 110 moves in the X direction on two rails laid in the Y direction, the focal plane 1112 of the imaging unit 111 is an area in which the in-focus position 1111 of the imaging unit 111 is expanded in the X direction. and is configured as a plane parallel to the XY plane.

The illumination unit 112 is a component that illuminates an area (part or all of the in-focus plane 1112 ) including at least the focus position 1111 of the imaging unit 111 under the control of the processing/control unit 140 . As the illumination unit 112, for example, a rod-shaped illumination device equipped with an LED can be used. In addition, in the example shown in FIG. 2, a bar-shaped illumination unit 112 extending in the Y direction is illustrated.

Next, the support mechanism 120 will be described.
The support mechanism 120 is a mechanism that supports the second surface 212 that is the rear surface of the first surface 211 that is the imaging surface of the cast piece sample 210 under the control of the processing/control unit 140 . The support mechanism 120 includes a plurality of support members 121-124 that support a plurality of points 2121-2124 on the second surface 212, respectively. Specifically, in the example shown in FIG. 2, the support member 121 abuts on the second surface 212 at a point 2121 to support the second surface 212, and the support member 122 abuts on the second surface 212 at a point 2122 to support the second surface. The support member 123 abuts the second surface 212 at a point 2123 to support the second surface 212 , and the support member 124 abuts the second surface 212 at a point 2124 to support the second surface 212 . Support. The plurality of support members 121 to 124 are configured by, for example, jacks that can be raised and lowered in the Z direction, and are configured to be independently raised and lowered under the control of the processing/control section 140 . Further, when this form is adopted, for example, the support mechanism 120 may include a motor or the like for lifting and lowering each of the support members 121 to 124 corresponding to each of the support members 121 to 124 .

Next, the position measuring section 130 will be described.
The position measuring unit 130 is a component that measures the position in the Z direction of the first surface 211 , which is the imaging surface of the slab sample 210 , under the control of the processing/control unit 140 . In the example shown in FIG. 2, a plurality of position measurement units 130-1 to 130-4 for measuring the positions of a plurality of points 2111 to 2114 on the first surface 211 corresponding to the plurality of points 2121 to 2124 on the second surface 212 are provided. The form to provide is shown. Specifically, position measuring unit 130-1 is a measuring unit that measures the position of 2111 on first surface 211 corresponding to point 2121 on second surface 212, and position measuring unit 130-2 measures the position of second surface 212. , and the position measuring unit 130-3 measures the position of the point 2113 on the first surface 211 corresponding to the point 2123 on the second surface 212. The position measuring unit 130-4 is a measuring unit that measures the position of the point 2114 on the first surface 211 corresponding to the point 2124 on the second surface 212. As shown in FIG. In addition, these multiple position measuring units 130-1 to 130-4 are composed of, for example, laser displacement gauges.

Next, the processing/control unit 140 will be described.
The processing/control unit 140 controls each component of the cast piece photographing apparatus 100 based on the input information input from the input unit 150, for example, and comprehensively controls the operation of the cast piece photographing apparatus 100. process. The processing/control section 140 includes a support mechanism control section 141 and a photographing mechanism control section 142, as shown in FIG.

The support mechanism control unit 141 controls the support mechanism 120 so that the first surface 211 , which is the imaging surface of the cast piece sample 210 , is arranged on the focusing surface 1112 of the imaging unit 111 based on the measurement result of the position measurement unit 130 . This is a configuration unit for drive control. Specifically, the support mechanism control unit 141 uses the position measurement results of the plurality of points 2111 to 2114 on the first surface 211 by the plurality of position measurement units 130-1 to 130-4 to determine the positions of the plurality of support members 121 to 2114. 124 are subjected to the drive control described above.

After the first surface 211 of the slab sample 210 is placed on the focal plane 1112 of the imaging unit 111 under the control of the support mechanism control unit 141 , the imaging mechanism control unit 142 controls the imaging unit 111 and the slab sample 210 . The photographing mechanism 110 including the illumination unit 112 is scanned, and photographing control is performed to cause the photographing unit 111 to photograph the first surface 211 of the slab sample 210 .

Next, the input section 150 will be described.
The input unit 150 is, for example, a component that inputs input information that is input by a user to the processing/control unit 140 .

Next, the display unit 160 will be described.
The display unit 160 is a component that displays various information, various data, etc. under the control of the processing/control unit 140 .

Next, the processing procedure of the cast piece photographing method by the cast piece photographing apparatus 100 shown in FIG. 2 will be described.
FIG. 3 is a flow chart showing an example of the processing procedure of the cast piece photographing method by the cast piece photographing apparatus 100 according to the embodiment of the present invention. Moreover, FIG. 4 is a schematic diagram showing an example of the processing procedure of the cast piece photographing method by the cast piece photographing apparatus 100 according to the embodiment of the present invention. In FIG. 4, the same reference numerals are assigned to the same configurations as those shown in FIG. The processing procedure of the flowchart shown in FIG. 3 will be described below with reference to FIGS. 2 and 4. FIG.

First, before starting the processing of the flow chart of FIG. 3, the user places the second surface 212 of the slab sample 210 on the plurality of support members 121 to 124 of the support mechanism 120 as shown in FIG. do. As a result, as shown in FIG. 2, the support member 121 abuts on the second surface 212 at a point 2121 to support the second surface 212 , and the support member 122 abuts on the second surface 212 at a point 2122 to support the second surface 212 . The surface 212 is supported, the support member 123 abuts on the second surface 212 at a point 2123 to support the second surface 212, and the support member 124 abuts on the second surface 212 at a point 2124 to support the second surface 212. It is assumed that

Then, in step S101 of FIG. 3, the processing/control unit 140 (specifically, the support mechanism control unit 141) adjusts the focal plane 1112 of the imaging unit 111 based on the input information input from the input unit 150, for example. Set position. Here, in the present embodiment, the focal plane 1112 of the imaging unit 111 is a plane parallel to the XY plane as described above. Set the Z coordinate value to indicate.

At this time, the relationship between the position of the focal plane 1112 of the imaging unit 111 set in step S101 of FIG. 4(a). Specifically, in FIG. 4A, the position of the first surface 211 of the slab sample 210 is lower than the position of the focal plane 1112 of the imaging unit 111 with respect to the height in the Z direction (that is, the Z direction is a small value). Further, in FIG. 4A, the position of point 2114 on first surface 211 of slab sample 210 is the position of other points 2111 to 2113 on first surface 211 of slab sample 210 with respect to the height in the Z direction. (that is, the Z-coordinate value of the point 2114 is higher than the Z-coordinate values of the points 2111 to 2113). The first surface 211 of the slab sample 210 is not parallel to the focal plane 1112 but is tilted.

Subsequently, in step S102 of FIG. 3, the plurality of position measuring units 130-1 to 130-4 measure the plurality of points 2121 to 2124 on the first surface 211 corresponding to the plurality of points 2121 to 2124 on the second surface 212 of the slab sample 210. The positions of points 2111-2114 are measured. In the example shown in FIG. 4(a), the position measuring unit 130-1 measures the position of the point 2111 on the first surface 211 shown in FIG. 4(a), and the position measuring unit 130-2 measures the ), the position measuring unit 130-3 measures the position of the point 2113 on the first surface 211 shown in FIG. 4A, and the position measuring unit 130-4 measures the position of the point 2114 on the first surface 211 shown in FIG. 4(a). At this time, the position measurement units 130-1 to 130-4 measure, for example, Z coordinate values indicating heights in the Z direction as the positions of points 2111 to 2114 on the first surface 211 shown in FIG. 4(a). do.

Subsequently, in step S103 of FIG. 3, the support mechanism control unit 141 uses the measurement results obtained by the position measurement units 130-1 to 130-4 in step S102 of FIG. Among the points 2111 to 2114, the point with the shortest distance to the in-focus plane 1112 of the photographing unit 111 is extracted as a reference point. In the example shown in FIG. 4A, the Z coordinate value of the point 2114 is larger than the Z coordinate values of the points 2111 to 2113 as described above. becomes the shortest distance d, and is extracted as a reference point.

Subsequently, in step S104 of FIG. 3, the support mechanism control unit 141 supports the points other than the corresponding points corresponding to the reference points among the plurality of points 2121 to 2124 on the second surface 212 of the slab sample 210. By driving the supporting member, driving control (first driving control) is performed to make the first plane 211 parallel to the in-focus plane 1112 of the photographing unit 111 . In the example shown in FIG. 4B, the support mechanism control unit 141 supports points 2121 to 2123 other than the corresponding point 2124 corresponding to the reference point 2114 among the plurality of points 2121 to 2124 on the second surface 212. The supporting members 121 to 123 are driven to make the first plane 211 parallel to the in-focus plane 1112 of the photographing unit 111 . As a result, in the example shown in FIG. 4B, the distance between the focal plane 1112 of the imaging unit 111 and the first surface 211 of the slab sample 210 is d. It should be noted that in the description of ``making the first surface 211 parallel to the focusing surface 1112 of the imaging unit 111'', ``parallel'' means that even if there is a slight variation (inclination), it can be regarded as being substantially parallel. shall be included.

Subsequently, in step S105 of FIG. 3, the support mechanism control unit 141 uses the measurement results obtained by the position measurement units 130-1 to 130-4 in step S102 of FIG. By driving all supporting members 121 to 124 that support all points 2121 to 2124 of the above-described corresponding points and other points on the surface 212, the cast slab sample 210 is positioned with respect to the focal plane 1112 of the photographing unit 111. Drive control (second drive control) for matching the first surfaces 211 is performed. In the example shown in FIG. 4(c), the support mechanism control unit 141 moves all the support members 121 to 124 that support all the points 2121 to 2124 on the second surface 212 of the slab sample 210 by a distance d in the Z direction. Drive control is performed so that the first surface 211 of the slab sample 210 is raised and aligned with the focal plane 1112 of the photographing unit 111 .

Subsequently, in step S106 of FIG. 3, the photographing mechanism control unit 142 includes the photographing unit 111 and the illumination unit 112 for the cast piece sample 210 in which the first surface 211 is arranged on the focal plane 1112 of the photographing unit 111. The imaging mechanism 110 is scanned (for example, the imaging mechanism 110 is scanned with respect to the slab sample 210 in the X direction shown in FIG. 2 from the right side of the slab sample 210 to the left side of the paper surface), and the imaging unit 111 performs photographing control for photographing the first surface 211 of the slab sample 210 .

Subsequently, in step S<b>107 in FIG. 3 , the processing/control unit 140 controls the display unit 160 to display the photographed image of the first surface 211 obtained by the photographing control of the photographing mechanism control unit 142 . At this time, the processing/control unit 140 can also adopt a form of performing control to display the evaluation result of the internal quality of the cast slab 200 obtained by analyzing the photographed image on the display unit 160 together with the photographed image.

After that, the processing of the flow chart shown in FIG. 3 ends.

In the slab photographing apparatus 100 according to the present embodiment described above, the support mechanism 120 that supports the second surface 212 that is the back surface of the first surface 211 photographed by the photographing unit 111 in the slab sample 210, and the slab sample 210 and the support mechanism 120 is adjusted so that the first surface 211 is placed on the in-focus plane 1112 of the photographing unit 111 based on the measurement result of the position measuring unit 130 . A support mechanism control unit 141 for drive control is provided.
As described above, in the present embodiment, the support mechanism 120 that supports the second surface 212 different from the first surface 211 of the slab sample 210 photographed by the photographing unit 111 is controlled to drive the first surface, which is the photographing surface. 211 is arranged on the in-focus plane 1112 of the photographing unit 111, it is possible to avoid damage to the photographing surface or adhesion of foreign matter to the photographing surface that may occur in the configuration described in Patent Document 1, for example. As a result, it is possible to obtain an appropriate photographed image that contributes to the evaluation of the internal quality of the cast slab 200 . Furthermore, in this embodiment, the support mechanism 120 is driven and controlled instead of the imaging mechanism 110 so that the first plane 211, which is the imaging plane, is arranged on the in-focus plane 1112 of the imaging unit 111. It is possible to avoid changing the optical axis of the optical equipment included in the imaging mechanism 110 every time the cast slab sample 210 changes. It is also possible to stably and continuously acquire an appropriate photographed image that contributes to

(Other embodiments)
In the above-described embodiment of the present invention, the points 2111 to 2114 on the first surface 211 corresponding to the points 2121 to 2124 on the second surface 212 shown in FIGS. Although the coordinates in the X direction and the coordinates in the Y direction are the same as those of the plurality of points 2121 to 2124 in , but the coordinates in the Z direction are different, the present invention is not limited to this form. From the viewpoint of performing the drive control of each of the support members 121 to 124 by the support mechanism control unit 141 with higher accuracy, the plurality of points 2111 to 2114 on the first surface 211 having the correspondence relationships shown in FIGS. Although it is more preferable to measure the position of the position by the position measuring units 130-1 to 130-4, in the present invention, a plurality of points 2121 to 2124 on the second surface 212 supported by the support members 121 to 124, respectively, and If the plurality of points 2111 to 2114 on the first surface 211 whose positions are to be measured by the position measuring unit 130 can establish a one-to-one correspondence, the coordinates in the X direction and the coordinates in the Y direction will not be the same. is also applicable.

Further, in the embodiment of the present invention described above, the support mechanism 120 supports the slab sample 210 at the four points 2121 to 2124 on the second surface 212, and the position measuring unit 130 supports the four points 2111 to 2124 on the first surface 211. Although an example of measuring the position of the first surface 211 at 2114 has been shown, the present invention is not limited to this form. From the viewpoint of supporting and measuring the surface, the support mechanism 120 supports the cast slab sample 210 at three points 2121 to 2123 on the second surface 212, and the position measurement unit 130 at three points on the first surface 211. A form of measuring the position of the first surface 211 at the points 2111-2113 is also included in the present invention. That is, in the present invention, the support mechanism 120 supports the slab sample 210 at three or more points on the second surface 212, and the position measurement unit 130 supports three or more points on the first surface 211. Any form that measures the position of the first surface 211 is applicable.

In the above-described embodiment of the present invention, FIG. 2 shows a mode in which the support members 121 to 124 directly support the second surface 212 of the cast slab sample 210 for the sake of simplicity of explanation. is not limited to this form. For example, between the support members 121 to 124 and the second surface 212 of the slab sample 210, a cradle made of metal, wood, or the like for receiving the slab sample 210 is provided, and the support members 121 to 124 are placed through the cradle. A configuration in which the second surface 212 of the slab sample 210 is indirectly supported by the slab sample 210 is also applicable to the present invention.

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

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

100: cast piece imaging device, 110: imaging mechanism, 111: imaging unit, 1111: focus position of imaging unit, 1112: focal plane of imaging unit, 112: illumination unit, 120: support mechanism, 121 to 124: support Members, 130-1 to 130-4: Position measurement unit, 140: Processing/control unit, 141: Support mechanism control unit, 142: Shooting mechanism control unit, 150: Input unit, 160: Display unit, 210: Cast slab sample , 211: first surface of slab sample 210, 2111 to 2114: points on first surface, 212: second surface of slab sample 210, 2121 to 2124: points on second surface

Claims (4)

A slab photographing device for photographing a slab sample taken from the slab in order to evaluate the slab,
a photographing means for photographing the first surface of the slab sample;
illumination means for illuminating the in-focus plane of the photographing means;
a support means for supporting a second surface, which is the back surface of the first surface, of the cast slab sample using a plurality of support members that support a plurality of points of three or more points on the second surface ;
position measuring means for measuring the position of the first surface by measuring positions of a plurality of points on the first surface corresponding to the plurality of points on the second surface ;
control means for driving and controlling the support means so that the first surface is arranged on the focal plane based on the measurement results of the positions of the plurality of points on the first surface by the position measurement means;
has
The control means, as the drive control,
A reference point having the shortest distance from the in-focus plane is extracted from the plurality of points on the first surface using the measurement result of the position measuring means, and one of the plurality of points on the second surface is a first drive control that drives the support member that supports other points other than the corresponding point corresponding to the reference point of to make the first plane parallel to the focal plane;
Using the measurement result of the position measuring means, the plurality of support members that support the corresponding points and the other points on the second surface are driven to match the first surface with the focal plane. a second drive control that causes
A cast piece photographing device. The control means further performs photographing control for causing the photographing means to photograph the first surface by scanning the photographing mechanism including the photographing means and the illumination means with respect to the cast slab sample. Item 1. A cast slab photographing apparatus according to Item 1. A slab photographing method using a slab photographing device for photographing a slab sample taken from the slab for evaluation of the slab ,
photographing means for photographing the first surface of the slab sample; illumination means for illuminating the focal plane of the photographing means ; Supporting means for supporting a plurality of points of three or more points on two surfaces using a plurality of supporting members ,
a position measuring step of measuring the position of the first surface by measuring the positions of a plurality of points of the first surface corresponding to the plurality of points of the second surface ;
a control step of driving and controlling the support means so that the first surface is positioned on the focal plane based on the position measurement results of the plurality of points on the first surface obtained by the position measurement step;
has
The control step includes, as the drive control,
Extracting a reference point having the shortest distance from the in-focus plane from among the plurality of points on the first surface using the measurement result of the position measurement step, a first drive control step of driving the support member supporting other points excluding corresponding points corresponding to the reference points of to make the first plane parallel to the focal plane;
Using the measurement result of the position measuring step, the plurality of supporting members that support the corresponding points and the other points on the second surface are driven to move the first surface with respect to the focal plane. a matching second drive control step;
A cast piece photographing method. A program for causing a computer to execute each step in the cast piece photographing method according to claim 3 .

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