JP3782816B2 - Calibration pattern unit - Google Patents

Description

  The present invention relates to a calibration pattern unit used for acquiring correction information of an imaging system.

  Various calibration patterns used for acquiring correction information of the imaging system have been proposed.

  For example, a technique for acquiring correction information of an imaging system by using a calibration pattern in which a known geometric pattern is described on a flat plate and changing the relative distance between the pattern and the imaging system has been proposed (for example, Patent Document 1).

In addition, a technique has been proposed in which a calibration pattern is configured by similarly describing a known geometric pattern on each surface of a corner cube structure, and correction information of an imaging system is acquired (see, for example, Patent Document 2).
JP-A-11-166818 JP 2001-82941 A

  By the way, in order to successfully acquire the correction information of the imaging system by imaging such a calibration pattern, the calibration pattern is imaged from an appropriate position and orientation, and an image suitable for subsequent correction information acquisition processing is obtained. It is necessary to obtain. If the calibration system configuration including the calibration pattern is made large and complex, it is possible to configure a calibration pattern device system that meets this purpose, but the calibration pattern is excellent in carrying, storing, moving, etc. It becomes difficult to configure.

  For example, in the conventional technique of flat plate movement type disclosed in Patent Document 1, the positional relationship between the imaging system and the calibration pattern is defined as an appropriate relationship, but the apparatus configuration is complicated and the calibration is performed. It is not easy to take the pattern device to the imaging site and calibrate frequently. Further, in the corner cube method disclosed in Patent Document 2 having a relatively simple configuration, the relative position and orientation between the imaging system and the calibration pattern are not fixed. Beginners are not guaranteed what kind of calibration pattern imaging will result in good calibration data acquisition, and as a result, the calibration data acquisition ends up being poor and requires calibration data acquisition again. .

  In general, a calibration process including acquisition of correction information of an imaging system using a calibration pattern and correction of the imaging system based on the acquired correction information is performed in a factory that manufactures a product incorporating the imaging system. The However, the user who uses the product may have to perform calibration at the imaging site according to the size of the imaging target to be imaged by the product, the imaging environment, and the like. In addition, when using a general-purpose imaging system owned by the user in advance, or even if it is dedicated to the product, the product is an assembly type, and the product can only be used after it is assembled at the imaging site. In such a case, the user must perform calibration at the imaging site.

  Accordingly, there is a demand for a calibration pattern unit having a calibration pattern that has no shooting errors from the viewpoint of obtaining optimum calibration data and has a form that is convenient for carrying, packing, and storage.

  The present invention has been made in view of the above points, and provides a calibration pattern unit that is free from shooting errors in view of obtaining optimum calibration data and that is convenient for carrying, packing, and storing. Objective.

One aspect of the calibration pattern unit of the present invention is:
A calibration pattern unit for obtaining correction information of an imaging system of the imaging means by imaging with an imaging means,
A predetermined pattern on a three-dimensionally arranged surface composed of a regular polyhedron or a part of the regular polyhedron, or on one or more curved surfaces in a range having substantially the same shape as the object to be imaged by the imaging means A calibration pattern is formed .

  According to the present invention, it is possible to provide a calibration pattern unit that is free from shooting errors from the viewpoint of obtaining optimum calibration data and that is convenient for carrying, packing, and storing.

  Before describing each embodiment of the calibration pattern unit of the present invention in detail, first, an example of a known geometric pattern which is a predetermined pattern described on the calibration pattern included in the calibration pattern unit will be described. . The example of the known geometric pattern is common to all the embodiments.

  That is, as shown in FIG. 1A, a known geometric pattern composed of a plurality of large black circles 1, small black circles 2, plane crossing lines 3 and outline boundary lines 4 has three flat calibration patterns. The calibration pattern 5 is configured as described in the description section.

  The black circle large 1, black circle small 2, plane crossing line 3, and outline boundary line 4, that is, the pattern constituents constituting the known geometric pattern, are described with constant rules at regular intervals. These intervals and rules can be arbitrarily selected depending on a calibration algorithm, necessary imaging system correction information, and the like, and are not limited in the present invention. For example, the black circle may be a cross mark or a double circle composed of black and white, or may be distinguished by color information instead of being distinguished by the size of the black circle, and the plane crossing line 3 and the outline boundary line 4 are broken lines. It doesn't matter. Also, the area is not particularly defined. The calibration pattern description part may be a curved surface or a combination of a plurality of planes other than 3.

  In the drawings referred to in the description of each of the following embodiments, the known geometric pattern as described in the above description is actually described in the calibration pattern description section. Therefore, only the location of the surface on which such a known geometric pattern is described is shown with shading as necessary. This shaded surface is a pattern description surface.

  Then, the entire calibration pattern in which such a known geometric pattern is described is commonly expressed as calibration patterns 5, 5-1, 5-2, etc. in the following description of each embodiment. . Furthermore, in the example shown in FIG. 1A, the calibration pattern 5 has a corner cube shape, but the shape in each embodiment described below is not limited. Further, in the example shown in FIG. 1A, a known geometric pattern is described for the inner wall surface of the corner cube shape, but this may be described on the outer wall surface according to the imaging angle. Absent.

  In addition, the imaging system that performs calibration in the present invention means various imaging systems such as a film camera, a digital camera, a video camera, a microscope endoscope, a multi-view stereo camera, a pattern projection camera, and a slit scan camera. The form gives no restrictions.

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

[First Embodiment]
FIG. 1B is a perspective view showing a calibration pattern unit according to the first embodiment of the present invention.

  In the calibration pattern unit according to the present embodiment, the position and orientation of the imaging system 6 with respect to the calibration pattern 5-1 are restricted by the relative position and orientation fixing unit 7. Here, the relative position / posture fixing unit 7 may be completely fixed to the calibration pattern 5-1, or may be detachably attached with a screw or the like. Further, an adjustment mechanism such as a pan head may be further provided so that the position and orientation can be finely adjusted and a plurality of types of imaging systems can be mounted. As a result, the fixing jig such as a screw may have any degree of freedom of adjustment as long as the predetermined position and orientation are maintained.

  FIG. 1C is a diagram showing a state in which the calibration pattern 5-1 is observed with a finder (not shown) of the imaging system 6 in the calibration pattern unit having such a configuration. An image 8 like this is obtained.

  Good calibration pattern imaging depends on conditions such as the calibration intention, the shape of the calibration pattern, and the imaging environment. Usually, there are optimum values for the position of the boundary line for performing good calibration, the size of the observed point, the direction in which the boundary line is observed, the area size in which the pattern description surface is imaged, and the like. As a result, the image magnification and the imaging angle when the calibration pattern 5-1 is imaged by the imaging system 6, that is, the position and orientation constraint conditions of the calibration pattern 5 and the imaging system 6, and this condition The mechanism of the relative position / posture fixing unit 7 is set so as to satisfy the above. Therefore, as long as the imaging system 6 is installed in the relative position / posture fixing unit 7 installed in the calibration pattern 5-1, the operator can capture a good calibration pattern without being bothered by every adjustment.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.

  FIG. 2A shows a calibration pattern unit according to the second embodiment.

  The calibration pattern unit according to the present embodiment is used for imaging a calibration pattern for satisfactorily imaging a cylindrical real target object (not shown) by an imaging system (not shown). And a calibration pattern 5-2 having substantially the same shape and size. That is, the ratio of the width (W), height (H) and depth (D) of the calibration pattern 5-2 to those of the object to be imaged by the imaging system is set to approximately 1.0.

  And the said calibration pattern 5-2 is imaged on the conditions equivalent to the imaging magnification and angle conditions when actually imaging a real target object.

  That is, for example, when aiming at a three-dimensional reconstruction of an actual target object, a calibration image having such an approximate shape is used to perform calibration imaging, thereby corresponding to the minimum image space to be corrected. Since the known point coordinate information in the three-dimensional space can be acquired, the calibration calculation load can be reduced, and at the same time, highly accurate calibration data can be acquired by eliminating unnecessary points that easily contain noise.

  FIG. 2B is a diagram showing a modification of the calibration pattern unit according to the second embodiment of the present invention.

  In other words, the calibration pattern unit of this modification example includes a calibration pattern 5-3 having a face shape based on the average face shape of a person in accordance with the imaging for the purpose of three-dimensional reconstruction of the person's face. It is what you have.

  As in the second embodiment, this is the best for three-dimensional reconstruction of a human face by performing calibration imaging under the same imaging conditions such as image magnification and imaging angle for imaging an actual person. Calibration pattern imaging is performed.

[Third Embodiment]
Next, a third embodiment of the present invention will be described.

  FIG. 2C is a perspective view showing a calibration pattern unit according to the third embodiment.

  The calibration pattern unit according to the present embodiment has a bowl shape, that is, a calibration pattern 5-4 described on a part of the surface of an approximate spherical surface.

  In this case, since a point-symmetric pattern is described with respect to the approximate center of the surface as shown in the figure, the calibration pattern 5-4 is imaged at approximately the center of the angle of view of the imaging system to be calibrated. If it tries so, it will hardly depend on the direction of imaging, and uniform calibration pattern imaging can always be performed satisfactorily.

  2D and 2E are diagrams showing modifications of the calibration pattern unit according to the third embodiment of the present invention. Here, the first modified example shown in FIG. 2D is a calibration pattern unit provided with a calibration pattern 5-5 in which a known geometric pattern is described on each face of a regular dodecahedron. The second modification shown in (E) of 2 is a calibration pattern unit including calibration patterns 5-6 in which a known geometric pattern is described on each face of a regular icosahedron.

  Even in these modified examples, as in the third embodiment, it is possible to observe a substantially uniform calibration pattern without depending on the imaging direction of the calibration pattern, and a calibration pattern that is geometrically easy to configure. Is configurable.

  As described in the third embodiment, the first modification example and the second modification example of the third embodiment, the present embodiment can be variously modified, and the available polyhedrons are: Other regular tetrahedrons, regular hexahedrons, ellipsoidal spheres, and parts thereof, combinations of regular polyhedrons of the same type, combinations of different types of regular polyhedrons, patterns on the inner wall, not the outer wall There is something, and the form is not limited.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described.

  FIG. 3A shows a calibration pattern unit according to the fourth embodiment.

  When a corner cube type calibration pattern 5 as shown in FIG. 1A is imaged satisfactorily, it becomes as shown in FIG. 1C, but the boundary of the region included in the angle of view in this case is shown. When illustrated, the boundary line 9 is as shown in FIG. Therefore, in the calibration pattern unit according to the fourth embodiment, the boundary line 9 is actually described as an imaging instruction unit on the calibration pattern 5-7.

  Thus, when imaging with the imaging system, the position and orientation of the imaging system and the calibration pattern 5-7 are adjusted so that the imaging instruction unit (boundary line 9) fills the finder (not shown) of the imaging system. By imaging, an ideal calibration pattern can be imaged.

  The fourth embodiment can be modified in various ways. For example, in the first modification shown in FIG. 3B, the imaging instruction unit displays the area itself in which the calibration pattern 5-8 is described. It is a thing. In the case of such a configuration, the minimum necessary pattern description for the area to be imaged can be described.

  Further, in the second modified example, as shown in FIG. 3C, the calibration pattern 5-9 is the boundary of the structure of the calibration pattern unit, and the calibration pattern is an imaging instruction unit. Is a unit. With such a configuration, a calibration pattern unit having a minimum necessary size can be configured, and a calibration pattern unit excellent in transportation and storage can be provided.

  (D) of FIG. 3 is a figure which shows the 3rd modification. In other words, the imaging instruction unit is formed by color-coding the inside and the outside of the calibration pattern 5-9, and an imaging instruction unit with high recognizability can be provided.

  In the fourth modified example, as shown in FIG. 3E, a so-called “register mark” 9-1 to 9-6 is placed on a part of the boundary line 9, for example, each corner portion of the boundary line. 10 is a calibration pattern unit that is described above as an imaging instruction unit. In such a calibration pattern unit, the imaging instruction unit can be easily described in the minimum area.

  As described above, various forms of the imaging instruction unit are conceivable, and the form is not limited.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described.

  FIG. 4A is a perspective view showing a calibration pattern unit according to the fifth embodiment.

  That is, in the present embodiment, the calibration pattern unit is configured such that the rod-shaped imaging instruction unit 10 is installed at the corner portion of the calibration pattern 5-10 described on the corner cube-shaped inner wall surface. The imaging instruction unit 10 indicates an optical axis of an imaging system (not shown), and the calibration pattern 5-10 is set by matching the imaging instruction unit 10 in a preset direction with the optical axis of the imaging system. Around the optical axis, it is installed with respect to the calibration pattern 5-10 so that it can be imaged as a substantially uniform pattern distribution.

  The operator pays attention so that the imaging instruction unit can be observed almost as a point while observing the rod-shaped imaging instruction unit 10 with a finder (not shown) of the imaging system, and the calibration pattern 5-10 to be imaged By taking an image so that the image is properly included in the angle of view, it is possible to image the calibration pattern in an appropriate imaging direction excluding the rotation direction component around the optical axis.

  A first modification of the fifth embodiment of the present invention will be described with reference to FIG. In this figure, one surface constituting the corner cube-shaped calibration pattern 5-10 as shown in FIG. 4A is taken out and illustrated.

  That is, this one surface is composed of two plate-like calibration patterns 5-11-A and 5-11-B. A hole 5-11-A-1 is formed in at least a part of the calibration pattern 5-11-A, and the calibration pattern 5-11-A is observed from a predetermined imaging position 11 through the hole 5-11-A-1. A black oval shape 5-11-B-1 is described at a position on the calibration pattern 5-11-B that is sometimes observable.

  Such a configuration is performed on all of the corner cube-shaped calibration pattern description surfaces, and as a result, the black ellipse pattern as a whole is best imaged when imaged from a predetermined imaging position 11. By capturing the calibration pattern while adjusting the position and orientation of the imaging system, the most suitable imaging position and orientation for the calibration pattern imaging are instructed.

[Sixth Embodiment]
Next, a sixth embodiment of the present invention will be described with reference to FIGS.

  The present embodiment provides a calibration pattern unit used in a calibration apparatus having an imaging unit as shown in FIG. That is, in this imaging unit, a stereo optical system composed of four flat mirrors 12-1, 12-2, 12-3, 12-4 is placed at a predetermined position with respect to the imaging system 13. ing. Here, the position and orientation relationship between the stereo optical system and the imaging system 13 is fixed by a restraining member (not shown).

  When a calibration pattern such as that shown in FIG. 5C is imaged through the stereo optical system in this state, the calibration pattern is shown in FIG. 5B by a finder (not shown) of the imaging system 13. Observe as. In FIG. 5B, reference numeral 8-1 denotes an image formed on the imaging system 13 through the flat mirrors 12-1 and 12-2, and similarly, reference numeral 8-2 denotes Images formed on the imaging system 13 through the flat mirrors 12-4 and 12-3 are shown. That is, when imaging is performed by the imaging system 13 without the stereo optical system as described above, by eliminating the unnecessary imaging area by the size and arrangement position of the flat mirrors 12-1 to 12-4 and a restraining member (not shown). The imaging unit of the calibration device is configured so that the images 8-1 and 8-2 captured through the stereo optical system exist inside the maximum imaging region 14 that can be observed with the finder.

  The virtual frame lines 15-1 and 15-2 on the calibration pattern shown in FIG. 5C indicate that the captured images 8-1 and 8-2 are the best positions in the calibration pattern imaging. Each of the outer frame portions on the finder when observed is shown in which part of the area on the actual calibration pattern. In other words, the frame lines 15-1 and 15-2 are actually described on the calibration pattern as the imaging instruction unit, and are captured to the full boundaries of the images 8-1 and 8-2 on the finder. If the operator can capture the calibration pattern as described above, the best calibration pattern imaging is possible as a result.

  Therefore, in the calibration pattern unit according to the sixth embodiment, as shown in FIG. 5D, the calibration pattern 5 in which the boundary line only on the frame line 15-1 side is described as the imaging instruction unit. -12. In other words, since the stereo imaging can be performed only in the area where the frame lines 15-1 and 15-2 overlap, it is sufficient to secure at least the overlapping area, and if only one of them is sufficient, the function is sufficient. Therefore, in the present embodiment, the boundary line only on the frame line 15-1 side is used as the imaging instruction unit.

  As described above, the correct calibration pattern imaging angle can be set by paying attention to only one of the images that have passed through different optical paths that are imaged through the stereo optical system.

  FIG. 6A is a diagram showing a first modification of the sixth embodiment of the present invention. The first modification is an example in which an imaging instruction unit is formed by not describing a pattern outside the boundary (frame line 15-1) where imaging is not performed in the first place. Thereby, it becomes possible to reduce a useless pattern description area.

  Furthermore, as a second modification of the sixth embodiment, in FIG. 6B, the outside of the boundary (frame line 15-1) is not imaged in the first place, so the structure of the calibration pattern unit itself is this. It is configured to be a boundary. As a result, the calibration pattern size is a minimum necessary size, and a calibration pattern unit having excellent portability and storage property can be provided.

  In the third modification of the sixth embodiment, as shown in FIG. 6C, the imaging instruction unit is made by changing the color of the inside of the boundary (frame line 15-1) and the background of the outside. This is a calibration pattern unit having a calibration pattern. This increases the visibility of the imaging angle adjustment.

  FIG. 6D is a diagram showing a fourth modification of the sixth embodiment, and a so-called “dragonfly” is formed at each corner portion 15-1 ′ of a boundary (frame line 15-1) (not shown). It is a calibration pattern unit having a calibration pattern in which the imaging instruction unit is described in the form of “. According to the fourth modification, it is possible to give the guidance function while minimizing the influence of information deterioration on the original pattern of the calibration pattern.

  In the sixth embodiment and the first to fourth modifications thereof, an example in which an imaging instruction unit is provided only for one image that is divided and imaged by the stereo optical system has been described. In contrast, it is possible to provide an imaging instruction unit for both images. Examples of providing the imaging instruction unit for both images corresponding to the sixth embodiment and the first to fourth modifications of the sixth embodiment, respectively, are shown in FIGS. (E). Further, the fourth modification may be as shown in FIG. 7F instead of FIG. 7E.

  By providing the imaging instruction unit corresponding to both images in this way, calibration pattern imaging can be effectively performed when more accuracy is required for installation of the stereo optical system with respect to the optical system.

  Since other operations are the same as those of the sixth embodiment and the first to fourth modifications of the sixth embodiment, description thereof will be omitted.

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications and applications are possible within the scope of the gist of the present invention. It is.

(Appendix)
The invention having the following configuration can be extracted from the specific embodiment described above.

(1) A calibration pattern unit for acquiring correction information of an imaging system of the imaging unit by imaging with the imaging unit,
Having a calibration pattern in which a predetermined pattern is formed in a range having substantially the same shape as an object to be imaged by the imaging means on a plurality of three-dimensionally arranged planes or one or more curved surfaces. A featured calibration pattern unit.

(Corresponding embodiment)
The embodiment related to the calibration pattern unit described in (1) corresponds to the second embodiment.

(Function and effect)
According to the calibration pattern unit described in (1), since the calibration is performed using the same shape as the target object that is actually imaged, the imaging region position, size, and accuracy necessary for calibration are appropriate. Calibration can be realized.

  (2) The width, height, and depth of the object to be imaged by the imaging means and the ratio of the range having the substantially same shape is approximately 1.0, as described in (1) Calibration pattern unit.

(Corresponding embodiment)
The embodiment relating to the calibration pattern unit described in (2) corresponds to the second embodiment.

(Function and effect)
According to the calibration pattern unit described in (2), since the calibration is performed using a pattern having approximately the same shape range as the target object that is actually imaged, a calibration with more appropriate imaging region position, size, and accuracy. Can be realized.

  (3) The calibration pattern unit according to (1), wherein the calibration pattern is a human face shape.

(Corresponding embodiment)
The embodiment relating to the calibration pattern unit described in (3) corresponds to a modification of the second embodiment.

(Function and effect)
According to the calibration pattern unit described in (3), by performing calibration imaging under equivalent imaging conditions such as image magnification and imaging angle for imaging an actual person, it is most suitable for three-dimensional reconstruction of a human face. Good calibration pattern imaging can be performed.

1A is a diagram for explaining a calibration pattern, FIG. 1B is a perspective view showing a calibration pattern unit according to the first embodiment of the present invention, and FIG. FIG. 6C is a diagram illustrating a state in which the calibration pattern of the calibration pattern unit according to the first embodiment is observed with the finder of the imaging system. FIG. 2A shows a calibration pattern unit according to the second embodiment, and FIG. 2B shows a modification of the calibration pattern unit according to the second embodiment of the present invention. FIG. 2C is a perspective view showing a calibration pattern unit according to the third embodiment of the present invention, and FIG. 2D is a perspective view of the calibration pattern unit according to the third embodiment. It is a figure which shows a 1st modification, (E) of FIG. 2 is a figure which shows the 2nd modification of the calibration pattern unit which concerns on 3rd Embodiment. 3A shows a calibration pattern unit according to the fourth embodiment of the present invention, and FIG. 3B shows a first modification of the calibration pattern unit according to the fourth embodiment. FIG. 3C is a diagram illustrating an example, FIG. 3C is a diagram illustrating a second modification of the calibration pattern unit according to the fourth embodiment, and FIG. 3D is a calibration according to the fourth embodiment. FIG. 3E is a diagram showing a fourth modification of the calibration pattern unit according to the fourth embodiment. FIG. 4A is a perspective view showing a calibration pattern unit according to the fifth embodiment of the present invention, and FIG. 4B is a modification of the calibration pattern unit according to the fifth embodiment. It is a figure which shows an example. FIG. 5A is a diagram showing a configuration of an imaging unit of a calibration apparatus to which a calibration pattern unit according to the sixth embodiment of the present invention is applied, and FIG. 5B is a diagram of FIG. FIG. 5C is a diagram showing an image of a calibration pattern observed by the imaging system finder in the imaging unit having the configuration of FIG. 5C, and FIG. 5C is a portion corresponding to the image shown in FIG. 5B on the calibration pattern unit. FIG. 5D is a diagram illustrating a calibration pattern unit according to the sixth embodiment. FIG. 6A is a diagram illustrating a first modification of the calibration pattern unit according to the sixth embodiment, and FIG. 6B is a diagram illustrating a calibration pattern unit according to the sixth embodiment. FIG. 6C is a diagram illustrating a third modification of the calibration pattern unit according to the sixth embodiment, and FIG. 6D is a diagram illustrating the sixth embodiment. It is a figure which shows the 4th modification of the calibration pattern unit which concerns on a form. FIG. 7 is a diagram for explaining a case where imaging instruction units corresponding to both of the observed calibration pattern images shown in FIG. 5B are provided. In particular, FIG. 5B corresponds to FIG. 5D, FIG. 7B corresponds to FIG. 6A, and FIG. 7C corresponds to FIG. 6B. FIG. 7D corresponding to FIG. 7C corresponds to FIG. 6C, and FIG. 7E and FIG. 7F are respectively (D) of FIG. It is a figure corresponding to.

Explanation of symbols

    DESCRIPTION OF SYMBOLS 1 ... Black circle large, 2 ... Black circle small, 3 ... Intersection line, 4 ... Outer boundary line, 5, 5-1 to 5-10, 5-11-A, 5-11-B, 5-12 ... Calibration Pattern, 5-11-A-1 ... Hole, 5-11-B-1 ... Oval shape, 6 ... Imaging system, 7 ... Relative position / posture fixing unit, 8, 8-1, 8-2 ... Image, 9 ... Boundary lines, 9-1 to 9-6 ... register marks, 10 ... imaging instruction section, 11 ... imaging position, 12-1 to 12-4 ... flat mirror, 13 ... imaging system, 14 ... maximum imaging area, 15-1 , 15-2 ... frame line, 15-1 '... corner part.

Claims (5)

A calibration pattern unit for acquiring correction information of an image pickup system of the image pickup means by taking an image with the image pickup means,
A predetermined pattern on a three-dimensionally arranged surface composed of a regular polyhedron or a part of the regular polyhedron, or on one or more curved surfaces in a range having substantially the same shape as the object to be imaged by the imaging means calibration pattern unit, wherein the calibration pattern is formed consisting of.   2. The calibration according to claim 1, wherein a ratio of a width, a height, and a depth of an object to be imaged by the imaging unit to those in a range having the substantially same shape is approximately 1.0. Pattern unit.   The calibration pattern unit according to claim 1, wherein the calibration pattern has a face shape of a person. The calibration pattern unit according to claim 1, wherein the calibration pattern is imaged under the same conditions as when the object is imaged. The calibration pattern unit according to claim 4, wherein the condition is an imaging magnification when imaging the object or an angle when imaging the object.

Images