KR20220008072A - Calibration plate for scanner and method for calibrating using the same - Google Patents

Abstract

The present invention relates to a scanner having a plurality of scanning units with a fixed relative location of a coordinate, and to a scan data generation method for easily and accurately matching scan data obtained from each of the plurality of scanning units by using the scanner. By using the scanner according to the present invention, facial scan data can be obtained in addition to oral scan data, and the obtained oral scan data and the facial scan data can be easily and accurately matched. In addition, the present invention relates to a calibration plate for setting and calibrating the fixed relative location of the scanner having the plurality of scanning units with the fixed relative location of the coordinate, and to a calibration method by using the same.

Description

CALIBRATION PLATE FOR SCANNER AND METHOD FOR CALIBRATING USING THE SAME

The present invention relates to a scanner capable of easily matching scan data obtained from each of a plurality of scan units, and a scan data generating method using the same.

In addition, the present invention relates to a calibration plate for calibrating the scanner and a calibration method using the same.

Recently, when treating patients in dentistry, oral scanners are used to accurately determine the patient's dental condition.

1 is a view showing a state of scanning teeth in the oral cavity of a patient using an oral scanner.

As shown in FIG. 1 , the oral scanner 7 may be inserted into the patient's oral cavity to scan the patient's oral and dental conditions in a non-contact manner to generate oral scan data for all teeth in the patient's oral cavity.

The oral scan data may be visually confirmed by a patient and a doctor, and the doctor may perform dental treatment based on the oral scan data.

In this case, the dental treatment needs to be balanced in consideration of the relationship with the patient's face, and for this purpose, it is necessary to generate oral scan data including the facial scan data generated by scanning the patient's face.

However, in general, the oral scanner 7 is an optical device for precisely scanning a narrow area, and it is not possible to scan the entire face of the patient using the oral scanner 7, therefore, the patient's face scan data is 7) It must be acquired using a scanner other than the oral scanner 7 that can scan a wider area (hereinafter referred to as a 'facial scanner'), and accordingly, the facial scan data acquired using a separate facial scanner is converted into an oral scanner. It is necessary to match the oral scan data obtained using

At this time, since each of the oral scan data and the facial scan data acquired with a separate scanner are defined in different coordinate systems, they cannot be directly matched. There was a problem in matching the data.

On the other hand, Korean Patent Publication No. 10-1100318 discloses a "dual oral camera capable of selectively photographing teeth and face" has been disclosed.

The dual intraoral camera according to the prior art is capable of selectively photographing not only the oral cavity but also the face, but the facial photographing in the dual oral camera according to the prior art is only for obtaining only a facial image for patient identification, and thus the In the case of using a dual intraoral camera according to the prior art, it is not possible to obtain facial scan data as well as to solve the above problems, that is, difficulties occurring when matching oral scan data and facial scan data.

Korea Patent Publication No. 10-1100318 (Announcement date: 2011. 12. 30)

An object of the present invention is to basically solve the problems of the prior art.

According to an embodiment of the present invention, a scanner having a plurality of scan units having a fixed relative position of a coordinate system, and a scan data generating method capable of easily and accurately matching scan data obtained from each of the plurality of scan units using the scanner would like to provide

Through an embodiment of the present invention, it is possible to obtain not only oral scan data but also facial scan data, and to provide a scanner and scan data generating method that can easily and accurately match the acquired oral scan data and facial scan data.

An embodiment of the present invention provides a calibration plate for setting and calibrating the fixed relative positions of a scanner having a plurality of scan units having a fixed relative position in a coordinate system, and a calibration method using the same.

A calibration plate according to an embodiment of the present invention comprises: a calibration plate for a scanner in which a relative position of a coordinate system of a first scan unit and a coordinate system of a second scan unit is fixed; an identification unit for a first scan unit formed on the plate; and an identification unit for a second scanning unit formed on the plate, wherein the identification unit for the first scanning unit includes at least three or more identification means having different coordinate information based on the coordinate system of the calibration plate, 2 The identification unit for the scan unit may include at least three or more identification means having different coordinate information based on the coordinate system of the calibration plate.

In addition, in the calibration plate according to an embodiment of the present invention, the first formation area in which the identification part for the first scan unit is formed may be narrower than the second formation area in which the identification part for the second scan part is formed.

In addition, in the calibration plate according to an embodiment of the present invention, the identification unit for the first scan unit and the identification unit for the second scan unit may be formed in an area in which the first scan unit and the second scan unit can scan at the same time.

In addition, in the calibration plate according to an embodiment of the present invention, the identification unit for the first scan unit may be formed at a lower portion of the plate, and the identification unit for the second scan unit may be formed at an upper portion of the plate.

In addition, in the calibration plate according to an embodiment of the present invention, the first formation region in which the identification unit for the first scan unit is formed and the second formation region in which the identification unit for the second scan unit is formed overlap a predetermined area, and the first At least one of the identification means of the identification unit for the scan unit and the identification means of the identification unit for the second scan unit may be formed in the overlapping area.

In addition, in the calibration method according to an embodiment of the present invention, in the calibration method using a calibration plate for a scanner in which the relative positions of the coordinate system of the first scan unit and the coordinate system of the second scan unit are fixed, the calibration plate is the A first identification unit for a first scan unit provided with at least three or more identification means having different coordinate information based on the coordinate system, and at least three or more identification means having different coordinate information based on the coordinate system of the calibration plate. A first scan step comprising two identification units for scanning units, wherein the calibration method includes: a first scanning step of calculating, by the first scanning unit, a relative position between a coordinate system of the first scanning unit and a coordinate system of the calibration plate by scanning the identification unit for the first scanning unit; a second scanning step in which the second scan unit scans the identification unit for the second scan unit and calculates a relative position between the coordinate system of the second scan unit and the coordinate system of the calibration plate; and a relative position calculation step of calculating the relative positions of the coordinate system of the first scan unit and the coordinate system of the second scan unit based on the coordinate system of the calibration plate.

In addition, in the calibration method according to an embodiment of the present invention, the first scan step and the second scan step may be performed simultaneously.

In addition, the calibration method according to an embodiment of the present invention may include a storage step of storing the relative position calculated in the relative position calculation step as the fixed relative position in the scanner.

According to the scanner and the method for generating scan data according to an embodiment of the present invention, scan data obtained from each of a plurality of scan units can be easily and accurately matched.

In addition, according to the scanner and the scan data generating method according to an embodiment of the present invention, not only the oral scan data but also the facial scan data can be acquired, and the acquired oral scan data and the facial scan data can be easily and accurately matched.

In addition, according to the calibration plate and the calibration method according to an embodiment of the present invention, it is possible to easily calibrate the fixed relative position of a scanner having a plurality of scan units having a fixed relative position of the coordinate system.

Effects according to the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description of the claims and detailed description. will be able

1 is a diagram schematically showing a scanner according to an embodiment of the present invention;
2 is a flowchart schematically illustrating a scan data generation method using a scanner according to an embodiment of the present invention;
3 is a view schematically showing a calibration plate according to an embodiment of the present invention,
4 is a flowchart schematically illustrating a calibration method using the calibration plate according to FIG. 3 .

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

In the description with reference to the accompanying drawings, the same components are given the same reference numerals, and redundant description thereof will be omitted.

Terms such as first and second may be used to describe the components, but the components are not limited to the above terms and are used only for the purpose of distinguishing one component from other components.

When a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

In the drawings, the thickness or size of each layer (film), region, pattern, or structure may be changed for clarity and convenience of description, and thus does not fully reflect the actual size.

In addition, each embodiment may be implemented independently or together, and some components may be excluded in accordance with the purpose of the invention.

1 is a diagram schematically illustrating a scanner according to an embodiment of the present invention.

Referring to FIG. 1 , a scanner 10 according to an embodiment of the present invention includes a housing 20 , a first scan unit 30 provided in the housing 20 , and a scanner 10 provided in the housing 20 . A second scan unit 40 may be included.

A relative position of the coordinate system of the first scan unit 30 and the coordinate system of the second scan unit 40 may be fixed.

In addition, the scanner 10 according to an embodiment of the present invention may include a storage unit 50 in which the fixed relative position is preset and stored.

In addition, the scanner 10 according to an embodiment of the present invention controls either one of the first scan unit 30 and the second scan unit 40 to operate, or the first scan unit 30 and the It may include a control unit 60 for controlling the second scan unit 40 to operate at the same time.

In addition, the scanner 10 according to an embodiment of the present invention operates any one of the first scan unit 30 and the second scan unit 40 or the first scan unit 30 and the second scan unit 40 . It may include a manipulation unit 70 for simultaneously operating the two scan units 40 .

The first scan unit 30 includes a first light output unit module 33 for outputting light to a subject, and a first light receiving unit module 34 for receiving the reflected light reflected from the subject to obtain an image image of the subject. ) may be included.

Similarly, the second scan unit 40 includes a second light output unit module 42 that outputs light to a subject, and a first light receiver module that receives reflected light reflected from the subject to obtain an image image of the subject. (44) may be included.

The first light output unit module 33 and the second light output unit module 42 may each be provided to output structured light for generating 3D scan data.

Here, the structured light may be patterned light having a predetermined pattern.

The first light output unit module 33 and the second light output unit module 42 may each include a light source unit (eg, a DLP projector), a light output optical system, and a light output controller for controlling the light output of the light source unit. have.

The first light receiving unit module 34 and the second light receiving unit module 44 may each include a light receiving optical system, an image sensor, and a light receiving controller for obtaining an image image from the image sensor. Here, as the image sensor, a Charged Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS) may be used.

A camera may be used as the first and second light receiver modules 34 and 44 .

The coordinate system of the first scan unit 30 and the second scan unit 40 is the focal point of the light receiving optical system (the focus of the camera when the first and second light receiving unit modules 34 and 44 are cameras) is the origin, and a vertical vector representing the shortest distance from the origin to the plane on which the image sensor is located is a Z-axis vector, a horizontal axis of the image sensor perpendicular to the Z-axis vector is an X-axis vector, and the Z-axis vector is The vertical axis of the image sensor may be a coordinate system defined by a Y-axis vector.

In addition, the scanner 10 according to an embodiment of the present invention generates first scan data from the first image image acquired by the first scan unit 30 , and generates first scan data from the second scan unit 40 . and an image processing unit 80 that generates second scan data from a second image image and matches the first scan data with the second scan data using the fixed relative position.

Here, the first scan data and the second scan data may be 3D scan data.

The image processing unit 80 includes a functional program, code, and code segment for implementing the scanner 10 according to an embodiment of the present invention, and is directly mounted inside the housing 20 of the scanner 10 . Alternatively, a functional program, code, and code segment for implementing the scanner 10 according to an embodiment of the present invention may be implemented in the scanner 10 through a computer-readable recording medium. ) may be implemented in a state of being stored and executed in a separate computer outside the housing 20, but the present invention is not limited thereto.

Similarly, the storage unit 50 may be provided in the housing 20 or may be provided in a separate computer outside the housing 20, but the present invention is not limited thereto. However, if the fixed relative position is provided in the housing 20, even if the computer is changed, the changed computer can use the fixed relative position stored in the storage unit 50 immediately without resetting the fixed relative position. can

In addition, the scanner 10 according to an embodiment of the present invention may include a calibration plate for setting or calibrating the fixed relative position. A detailed description thereof will be given later.

On the other hand, if the scanner 10 according to an embodiment of the present invention is used, not only the oral scan data but also the facial scan data can be acquired, and the acquired oral scan data and the facial scan data can be easily matched.

To this end, the first scan unit 30 may be provided to obtain an intraoral image image, and the second scan unit 40 may be provided to obtain a facial image image.

For example, the first light output unit module 33 may be provided to output light into the oral cavity, and the first light receiving unit module 34 receives the reflected light reflected in the oral cavity and enters the oral cavity. It may be provided to acquire a video image.

The second output module 42 may be provided to output light to the face, and the second light receiver module 44 may be provided to receive the reflected light reflected from the face to obtain the face image image can

In this case, the control unit 60 controls either one of the first optical output module 33 and the second optical output module 34 to output light, or the first optical output module 33 and It is possible to control the second light output module 34 to simultaneously output light.

The housing 20 may be provided with a first light output unit 23 for allowing the light output from the first light output unit module 33 to exit into the oral cavity and to receive the reflected light reflected from the oral cavity.

In addition, in the housing 20, a second input/output unit 25 for allowing the light output from the second light output module 42 to exit to the face, and to receive the reflected light reflected from the face, is provided in the first input/output unit. It may be provided separately from the miner 23 .

The first entrance/exit portion 23 and the second entrance/exit portion 25 are provided in an open shape, respectively, or in the form of a transparent plate that allows light to enter and exit and prevent foreign substances from entering into the housing 20 . may also be provided, but the present invention is not limited thereto.

In addition, as shown in the drawing, the first entrance/exit part 23 may be provided at a front lower portion of the housing 20 , and the second light/exit unit 25 may be provided on one side of the upper portion of the housing 20 . can be Then, the oral cavity and the face can be scanned at the same time.

In addition, on one side of the first input/output unit 23, the light output from the first light output unit module 33 is reflected into the oral cavity, and the reflected light reflected in the oral cavity is sent to the first light receiving unit module 34. A reflecting first reflecting mirror 27 may be provided.

Similarly, one side of the second input/output unit 25 also reflects the light output from the second light output unit module 42 to the face, and reflects the reflected light reflected from the face to the second light receiver module 44 . A second reflector 28 may be provided.

In addition, the scanner 10 according to an embodiment of the present invention may include a reflection member 29 for reflecting the light output from the second light output module 42 to the second reflection mirror 28 . .

According to the scanner 10 according to an embodiment of the present invention having the above configuration, the first scan unit 30 may acquire an intraoral image image, and the second scan unit 40 is a facial image In addition to being able to acquire an image, it is possible to simultaneously acquire the intraoral image image and the facial image image.

In this case, the image processing unit 80 may generate oral scan data from the intraoral image image, and may generate facial scan data from the facial image image, and use the fixed relative position to obtain the oral scan data and the Facial scan data can be easily matched.

In addition, the image processing unit 80 generates three-dimensional oral scan data from the oral image image, and a three-dimensional scan data generation unit for generating three-dimensional facial scan data from the facial image image, using the fixed relative position to include a matching unit for matching the three-dimensional oral scan data and the three-dimensional facial scan data.

Here, the three-dimensional oral scan data and the three-dimensional facial scan data may be three-dimensional scan data each consisting of one frame, or three-dimensional scan data in which three-dimensional scan data of a plurality of frames are matched, Alternatively, it may be 3D scan data for the entire face, but the present invention is not limited thereto.

2 is a flowchart schematically illustrating a method for generating scan data using a scanner according to an embodiment of the present invention.

Referring to FIG. 2 , the scan data generating method ( S10 ) according to an embodiment of the present invention includes a first scan step ( S20 ) of generating first scan data using the first scan unit 30 , and the A second scan step (S30) of generating second scan data using the second scan unit 40, and a matching step of matching the first scan data and the second scan data using the fixed relative position (S40) may be included.

In addition, the first scanning step ( S20 ) may include acquiring a first image image from the first scan unit 30 , and generating the first scan data from the first image image. .

Similarly, the second scanning step S30 may include obtaining a second image image from the second scan unit 40 and generating the second scan data from the second image image. .

In this case, the first scan data and the second scan data may be three-dimensional scan data, and the first image image is an intraoral image image, the first scan data is an intraoral scan data, and the second image As described above, the image may be a facial image image, and the second scan data may be facial scan data.

Meanwhile, the matching step ( S40 ) may include a simultaneous scanning step, a first matching step, and a second matching step.

The simultaneous scanning step is a step of generating first scan data and second scan data by using the first scan unit 30 and the second scan unit 40 at the same time.

The first matching step is a step of matching the first scan data and the second scan data generated in the simultaneous scan step using the fixed relative positions.

Here, since the first scan data and the second scan data generated in the simultaneous scan step are scan data generated at the same time, by using the fixed relative position, easy and accurate matching can be achieved.

The second matching step is a step of matching each of the first scan data generated in the first scan step and the second scan data generated in the second scan step with the matched scan data matched in the first matching step.

Here, the second matching step may be performed using an Iterative Closest Point (ICP) algorithm. However, the present invention is not limited thereto, and as another embodiment, the second matching step may be performed using a Normal Distributions Transform (NDT) algorithm.

Accordingly, in the method for generating scan data according to an embodiment of the present invention, the scan data obtained from each of the plurality of scan units can be easily and accurately matched using a scanner having a plurality of scan units having a fixed relative position of the coordinate system. .

In addition, by using the scan data generation method using a scanner according to an embodiment of the present invention, not only oral scan data but also facial scan data can be acquired, and the acquired oral scan data and facial scan data can be easily and accurately matched. have.

On the other hand, in another embodiment, the matching step (S40) may easily and accurately match the oral scan data and the facial scan data without the simultaneous scanning step.

To this end, the first scan data may include maxillary scan data, mandibular scan data, and maxillary and mandibular scan data, and the second scan data may include face scan data.

Then, in the matching step ( S40 ), the face scan data may be matched with at least one of the maxillary scan data and the maxillary scan data using the fixed relative position.

The teeth in the oral cavity are made up of the maxilla and the mandible, of which the mandible moves separately from the face by the temporomandibular joint, whereas the maxilla is formed as one-body with the face and moves together, so even if it is not scanned at the same time, the fixed Accurate registration is possible using the relative position.

Therefore, when the first scan data includes the maxillary scan data and the maxillary scan data, the face scan data is fixed relative to at least one of the maxillary scan data and the maxillary scan data without the simultaneous scanning step. can be matched using .

In detail, the first scan step (S20) includes a maxillary scan step of generating maxillary scan data using the first scan unit 30, and a mandibular scan data generation process using the first scan unit 30. It may include a mandibular scan step and a maxillary and mandibular scan step of generating upper and lower jaw scan data using the first scan unit 30 .

Here, the maxillary scan data is generated from a maxillary image obtained by scanning only the maxilla using the first scan unit 30 , and the mandibular scan data is scanned only the mandible using the first scan unit 30 . The maxillary and mandibular scan data are generated from the maxillary and mandibular images acquired by scanning the upper and lower jaws together using the first scan unit 30 .

In this case, the matching step (S40) includes a first matching step of matching the face scan data to at least one of the maxillary scan data and the maxillary scan data using the fixed relative position; and a second matching step of matching each of the maxillary scan data and the mandibular scan data.

Here, the second matching step may be performed using an Iterative Closest Point (ICP) algorithm. However, the present invention is not limited thereto, and as another embodiment, the second matching step may be performed using a Normal Distributions Transform (NDT) algorithm.

In addition, the second matching step may be performed after the first matching step, and conversely, the first matching step may be performed after the second matching step, but the present invention is not limited thereto.

For example, when the first matching step is performed first, at least one of the maxillary and maxillary scan data in the second matching step may be scan data in which the face scan data is matched, and vice versa. When the second matching step is performed first, the first matching step is performed on the maxillary and mandibular scan data in which the maxillary scan data and the mandibular scan data are matched in the second matching step using the fixed relative position. Facial scan data can be matched.

Hereinafter, a calibration plate for setting and calibrating the fixed relative position of a scanner according to an embodiment of the present invention and a calibration method using the same will be described in detail.

3 is a diagram schematically illustrating a calibration plate according to an embodiment of the present invention.

Referring to FIG. 3 , a calibration plate 100 according to an embodiment of the present invention includes a plate 110 , an identification unit 120 for a first scan unit formed on the plate 110 , and the plate 110 . It may include an identification unit 130 for the second scan unit formed in the.

The identification unit 120 for the first scan unit includes at least three identification units 123 having different coordinate information based on the coordinate system of the calibration plate 100 , and the identification unit 130 for the second scan unit ) may include at least three or more identification means 133 having different coordinate information based on the coordinate system of the calibration plate 100 .

Here, the identification means 123 and 133 are for identifying different coordinate information based on the coordinate system of the calibration plate 100 during scanning, and may be formed as an identification target in the form of a two-dimensional image as shown in the drawing. , or may be formed in a three-dimensional shape, the present invention is not limited by the specific shape, form, shape, etc. of the identification means.

In addition, the first formation region 125 in which the identification unit 120 for the first scan unit is formed may be narrower than the second formation area 134 in which the identification unit 130 for the second scan unit is formed.

In addition, the identification unit 120 for the first scan unit and the identification unit 130 for the second scan unit may be formed in an area where the first scan unit 30 and the second scan unit 40 can scan at the same time. have.

For example, the identification unit 120 for the first scan unit may be formed under the plate 110 , and the identification unit 130 for the second scan unit may be formed above the plate 110 .

Then, when the first scan unit 30 is provided to obtain an intraoral image image, and the second scan unit 40 is provided to obtain a facial image image, the first scan unit 30 and The second scan unit 40 may simultaneously scan the identification unit 120 for the first scan unit and the identification unit 130 for the second scan unit.

In addition, as shown in the drawing, the first forming region 125 in which the identification unit 120 for the first scan unit is formed and the second formation region 134 in which the identification unit 130 for the second scan unit is formed overlap each other. It may be formed so as not to fall, or may be formed to overlap a predetermined area, but the present invention is not limited thereto.

When the first forming area 125 and the second forming area 134 are formed to overlap a predetermined area, the identification means 123 of the identification unit 120 for the first scan unit and the second scan unit At least one of the identification means 133 of the identification unit 130 may be formed in the overlapping area. Then, the number of necessary identification means can be reduced.

For example, as shown in the drawing, when forming the first forming region 125 and the second forming region 134 not to overlap each other, at least six identification means 123 and 133 must be formed. On the other hand, in the case where the first forming region 125 and the second forming region 134 overlap a predetermined region and one identification means is formed in the overlapping region, at least five identification means 123 and 133 are provided. can be formed

4 is a flowchart schematically illustrating a calibration method using the calibration plate according to FIG. 3 .

Referring to FIG. 4 , the calibration method S100 according to an embodiment of the present invention may include a first scan step S110 , a second scan step S120 , and a relative position calculation step S130 . .

In the first scan step (S110), the first scan unit 30 scans the identification unit 120 for the first scan unit, and the coordinate system of the first scan unit 30 and the coordinate system of the calibration plate 100 are It is a step to calculate the relative position of

In the second scan step (S120), the second scan unit 40 scans the identification unit 130 for the second scan unit, and the coordinate system of the second scan unit 40 and the coordinate system of the calibration plate 100 are It is a step to calculate the relative position of

The step of calculating the relative position ( S130 ) is a step of calculating a fixed relative position of the coordinate system of the first scan unit 30 and the coordinate system of the second scan unit 40 based on the coordinate system of the calibration plate 100 . to be.

Here, the first scan step ( S110 ) and the second scan step ( S120 ) may be simultaneously performed.

In addition, in the calibration method (S100) according to an embodiment of the present invention, the storage step (S140) of storing the relative position calculated in the relative position calculation step (S130) as the fixed relative position in the scanner 10 (S140) may include

According to the calibration plate and the calibration method according to an embodiment of the present invention having the above configuration, it is possible to easily set and calibrate the fixed relative position of a scanner having a plurality of scan units having a fixed relative position of the coordinate system.

As described above, the present invention provides a scanner having a plurality of scan units having a fixed relative position in a coordinate system, and a scan data generating method capable of easily and accurately matching the scan data obtained from each of the plurality of scan units using the scanner And, it relates to a calibration plate for setting and calibrating the fixed relative position of the scanner and a calibration method using the same, the embodiment of which can be changed into various forms. Therefore, the present invention is not limited by the embodiments disclosed herein, and all forms that can be changed by a person of ordinary skill in the art to which the present invention pertains will also fall within the scope of the present invention.

10: scanner 20: housing
30: first scan unit 40: second scan unit
50: storage unit 60: control unit
70: operation unit 80: image processing unit
100: calibration plate
110: plate 120: first scan unit identification unit
123,133: identification means 130: second scan unit identification unit

Claims (8)

In the calibration plate for a scanner in which the relative positions of the coordinate system of the first scan unit and the coordinate system of the second scan unit are fixed,
plate;
an identification unit for a first scan unit formed on the plate; and
and an identification unit for a second scan unit formed on the plate.
The identification unit for the first scan unit includes at least three identification means having different coordinate information based on the coordinate system of the calibration plate,
The second identification unit for the scan unit calibration plate, characterized in that it comprises at least three or more identification means having different coordinate information based on the coordinate system of the calibration plate. The method of claim 1,
A calibration plate, characterized in that the first forming area in which the identification unit for the first scan unit is formed is narrower than the second formation area in which the identification unit for the second scan unit is formed. The method of claim 1,
The first scanning unit identification unit and the second scanning unit identification unit are formed in an area in which the first scanning unit and the second scanning unit can be scanned at the same time. 4. The method of claim 3,
The first identification unit for the scan unit is formed on a lower portion of the plate, and the second identification unit for the second scan unit is formed on the upper portion of the plate. The method of claim 1,
The first forming region in which the identification unit for the first scan unit is formed and the second formation region in which the identification unit for the second scan unit is formed are formed to overlap a predetermined area, and the identification means of the first scanning unit identification unit and the second scanning unit identification unit are formed to overlap each other. At least one of the negative identification means is a calibration plate, characterized in that formed in the overlapping area. In the calibration method using a calibration plate for a scanner in which the relative positions of the coordinate system of the first scan unit and the coordinate system of the second scan unit are fixed,
The calibration plate includes an identification unit for a first scan unit provided with at least three identification means having different coordinate information based on the coordinate system of the calibration plate, and at least having coordinate information different from each other based on the coordinate system of the calibration plate. Includes an identification unit for a second scanning unit provided with three or more identification means,
The calibration method is
a first scanning step in which the first scan unit scans the identification unit for the first scan unit to calculate a relative position between the coordinate system of the first scan unit and the coordinate system of the calibration plate;
a second scanning step in which the second scan unit scans the identification unit for the second scan unit and calculates a relative position between the coordinate system of the second scan unit and the coordinate system of the calibration plate; and
and a relative position calculation step of calculating the relative positions of the coordinate system of the first scan unit and the coordinate system of the second scan unit based on the coordinate system of the calibration plate. 7. The method of claim 6,
The calibration method, characterized in that the first scan step and the second scan step are performed simultaneously. 7. The method of claim 6,
and a storage step of storing the relative position calculated in the relative position calculation step as the fixed relative position in the scanner.

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