JP2019020314A - Line sensor optical axis adjustment device and line sensor optical axis adjustment method - Google Patents

Abstract

To provide a line sensor optical axis adjustment device and a line sensor optical axis adjustment method such that optical axes of a plurality of line sensor cameras can be easily adjusted.SOLUTION: A line sensor optical axis adjustment device comprises: first, second display devices 11, 12 which are installed at different positions in a front-rear direction and a right-left direction, and display first, second diamond-shape groups 11A, 12A respectively; first, second line sensor cameras 21, 22 which are installed at mutually different positions in the right-left direction, and image the first, second diamond-shape groups 11A, 12A simultaneously and respectively; a figure adjustment device 13 which can adjust the positions and angles of rotation of the first, second diamond-shape groups 11A, 12A respectively; and a line sensor adjustment base 25 which can adjust the position and angle of the second line sensor camera 22.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a line sensor optical axis adjusting device and a line sensor optical axis adjusting method.

  2. Description of the Related Art Conventionally, a technique for performing so-called stereo measurement using a plurality of line sensor cameras that image the same portion is known. Here, when performing stereo measurement using an area camera, it is only necessary to search for geometrical corresponding points by software between area camera images, and it is necessary to set the positions of multiple area cameras strictly. On the other hand, when performing stereo measurement using a line sensor camera, the line sensor camera is a one-dimensional sensor, so unlike the case of performing stereo measurement using an area camera, all line sensor cameras It is necessary to arrange the light receiving elements on a straight line.

  As a technique related to the adjustment of the optical axis of the line sensor camera, the following method has been proposed.

  That is, in Patent Document 1 below, an index pattern composed of four types of indices is drawn on a display body, the display body or the line sensor camera is moved while the display body is imaged, and an output signal is output. A technique for adjusting the optical axis of a line sensor camera by adjusting the relative position between the display body and the line sensor camera while monitoring is disclosed.

  Further, Patent Document 2 below discloses a technique for handling a single line sensor camera having a large number of pixels by integrating a plurality of line sensor cameras using a test chart provided with a scale.

  Patent Document 3 below discloses a technique for obtaining a posture, a focal length, and a position of a line sensor camera by imaging a calibration target with five or more height direction absolute coordinates with a line sensor camera. .

  Patent Document 4 listed below corrects the inclination of the photographing line of the line sensor camera by using a photographing line correcting member in which a plurality of rhombus shapes are arranged on a rectangular plate-shaped member so that their opposing points are in contact with each other. Techniques to do this are disclosed.

  Patent Document 5 below discloses a technique for adjusting the field of view of a line sensor camera by imaging a mark plate made of a horizontally long rectangular glass plate having a triangular pattern symmetrically drawn on both sides of a center line with a line sensor camera. Has been.

JP 2005-127723 A JP 2004-104457 A Japanese Patent No. 5565222 JP 2010-190886 A JP 2005-274272 A

  Although the technique disclosed in Patent Document 1 is not a technique for adjusting the optical axis for stereo measurement of a line sensor camera, it can be used for adjusting the optical axis for stereo measurement of a line sensor camera. However, there is a problem that the adjustment of the pan angle and the tilt angle defined later is not taken into consideration.

  Moreover, although the technique disclosed in Patent Document 2 can be used as an optical axis adjustment for stereo measurement of a line sensor camera and can determine whether or not the camera angle can be adjusted, There is a problem that adjustment is required and the work is complicated.

  Moreover, although the technique disclosed in Patent Document 3 can be used as an optical axis adjustment for stereo measurement of a line sensor camera, it is necessary to adjust all line sensor cameras as in Patent Document 2. There was a problem that the work was complicated.

  Moreover, since the technique disclosed in Patent Document 4 fixes the photographing line correction member, adjustment of the direction of the line sensor camera is complicated, and it is difficult to adjust a plurality of line sensors. There was a problem that there was.

  Moreover, since the technique disclosed in Patent Document 5 fixes the mark plate, adjustment of the direction of the line sensor is complicated, and it is difficult to adjust a plurality of line sensors. there were.

  In view of the above, an object of the present invention is to provide a line sensor camera optical axis adjustment device and a line sensor camera optical axis adjustment method capable of easily adjusting the optical axes of a plurality of line sensor cameras. .

The line sensor optical axis adjusting device according to the first invention for solving the above-mentioned problems is
A first display device for displaying a first graphic group in which a plurality of mark patterns in which the width in the left-right direction continuously decreases toward the upper and lower end portions are continuously arranged in the left-right direction;
A second display device that displays a second graphic group that is installed in different positions in the front-rear direction and the left-right direction from the first display device, and in which a plurality of the mark patterns are continuously arranged in the left-right direction;
One line sensor camera that simultaneously images the first graphic group and the second graphic group;
The one line sensor camera is installed at different positions in the left-right direction, and one or more other line sensor cameras that simultaneously image the first graphic group and the second graphic group;
The positions and rotation angles of the first graphic group and the second graphic group are set so that the vertical center lines of the first and second graphic groups coincide with the imaging line of the one line sensor camera. A figure adjustment device that can be adjusted individually,
A line sensor adjustment device capable of adjusting a position and an angle of the other line sensor camera so that an imaging line of the other line sensor camera coincides with a center line of the first and second graphic groups. It is characterized by.

Moreover, the line sensor optical axis adjusting device according to the second invention for solving the above-mentioned problems is as follows.
The line sensor adjusting device is a line sensor adjusting table capable of adjusting a vertical position, a tilt angle, and a roll angle of the other line sensor camera.

Further, a line sensor optical axis adjusting device according to a third invention for solving the above-described problem is
A line sensor fixing base capable of fixing the one line sensor camera and the line sensor adjusting base is provided.

Moreover, the line sensor optical axis adjusting device according to the fourth invention for solving the above-described problem is
The mark pattern is a rhombus.

Moreover, the line sensor optical axis adjustment method according to the fifth aspect of the invention for solving the above problem is as follows:
The first display device displays a first graphic group in which a plurality of mark patterns in which the width in the left-right direction continuously decreases toward the upper and lower end portions are continuously arranged in the left-right direction,
A second display device installed at a position different from the first display device in the front-rear direction and the left-right direction displays a second graphic group in which a plurality of the mark patterns are continuously arranged in the left-right direction. ,
The first figure group and the second figure group are simultaneously imaged by one line sensor camera,
The first graphic group and the second graphic group are simultaneously imaged by one or more other line sensor cameras installed at different positions in the left-right direction from the one line sensor camera,
Based on an image captured by the one line sensor camera, the first graphic group and the second graphic group have a vertical center line that coincides with an imaging line of the one line sensor camera. Adjusting the position and rotation angle of one graphic group and the second graphic group,
Based on the images of the first graphic group and the second graphic group whose position and rotation angle are adjusted by the other line sensor camera, the imaging lines of the other line sensor camera are the first and the second graphic sensors. The position and angle of the other line sensor camera are adjusted so as to coincide with the center line of the second graphic group.

Moreover, the line sensor optical axis adjustment method according to the sixth invention for solving the above-mentioned problems is as follows.
The position and angle of the other line sensor camera are adjusted by a line sensor adjustment base capable of adjusting the vertical position, tilt angle, and roll angle of the other line sensor camera.

Further, a line sensor optical axis adjustment method according to a seventh invention for solving the above-described problem is as follows.
The one line sensor camera and the line sensor adjustment base are fixed by a line sensor fixing base.

Moreover, the line sensor optical axis adjustment method according to the eighth invention for solving the above-mentioned problems is as follows.
The mark pattern is a rhombus.

  According to the line sensor optical axis adjusting device and the line sensor optical axis adjusting method according to the present invention, the optical axes of a plurality of line sensor cameras can be easily adjusted.

It is a schematic diagram which shows schematic structure of the line sensor optical axis adjustment apparatus which concerns on the Example of this invention. It is a flowchart which shows the outline of the flow of the line sensor optical axis adjustment which concerns on the Example of this invention. It is explanatory drawing which shows the relationship between the centerline of a 1st, 2nd rhombus group, and the imaging line of a 1st line sensor camera, Comprising: Fig.3 (a) is a 1st, 2nd rhombus group, and a 1st FIG. 3B shows a state in which the height of the line sensor camera is different from that of the imaging line, and the center line of the first rhombus group is inclined with respect to the imaging line of the first line sensor camera. 3 (c) shows a state in which the center line of the first rhombus group coincides with the imaging line of the first line sensor camera, and FIG. 3 (d) shows the center of the first and second rhombus groups. The line and the center line of the first line sensor camera coincide with each other. FIG. 4 is an explanatory view showing an example of an image of the first and second rhombus groups shown in FIG. 3, and FIG. 4 (a) is an image of the first and second rhombus groups and the first line sensor camera. FIG. 4B shows a state in which the center line of the first rhombus group is inclined with respect to the imaging line of the first line sensor camera, FIG. 4 (c) shows a state where the center line of the first rhombus group coincides with the imaging line of the first line sensor camera, and FIG. 4 (d) shows the center line of the first and second rhombus group and the first line sensor camera. The state where the center line of the line sensor camera coincides is shown.

  Hereinafter, a line sensor optical axis adjusting device and a line sensor optical axis adjusting method according to the present invention will be described with reference to the drawings.

  The line sensor camera is a camera having a linear field of view (imaging line) in which light receiving elements are arranged on a straight line. In order to perform stereo triangulation with this line sensor camera, it is necessary to use two or more line sensor cameras and to line up the imaging lines of each line sensor camera on a straight line. If the imaging lines of the line sensor cameras are not aligned on a straight line, a measurement error will occur.

  Therefore, in the present invention, a group of figures respectively displayed on two display devices such as a liquid crystal monitor is imaged by a plurality of line sensor cameras, and the image line of each line sensor camera and the center line of the two figures group are the same. The photographing lines of the plurality of line sensor cameras are arranged on a straight line by adjusting so as to be positioned on the plane.

  As a result, even if a total of three straight lines, that is, the center line of the graphic group displayed on each of the two display devices and the arrangement direction (photographing line) of the light receiving elements of the line sensor camera are at the twisted position, a plurality of lines can be easily obtained. The imaging line of the sensor camera can be arranged on a straight line.

  In the present invention, the graphic group is a mark pattern having a shape in which the width in the left-right direction (refer to the X direction in FIG. 1) continuously decreases toward the upper and lower ends. It is assumed that a plurality of adjacent lines are arranged continuously in the left-right direction so that the widest positions touch each other, and the center line of the figure group is the position where the width of the mark pattern in the left-right direction is the widest (position where adjacent mark patterns touch ).

  A line sensor optical axis adjusting apparatus and a line sensor optical axis adjusting method according to an embodiment of the present invention will be described in detail with reference to FIGS.

  As shown in FIG. 1, the line sensor optical axis adjustment device according to the present embodiment includes two display devices (first and second display devices) 11 and 12, a graphic adjustment device 13, and two lines. Sensor cameras (first and second line sensor cameras) 21 and 22 and an image processing device 23 are included.

  The first and second display devices 11 and 12 are liquid crystal monitors, and first and second rhombus groups (graphic groups) in which a plurality of rhombus shapes (mark patterns) are continuously arranged in the left-right direction on the display screen. ) 11A and 12A are displayed. The first and second rhombus groups 11A and 12A are arranged in a state in which the opposite points of the rhombus shape are in contact with each other. In this embodiment, the first and second rhombus groups 11A and 12A are displayed in white and the background is displayed in black.

  The first and second display devices 11 and 12 are arranged so that positions in the left-right direction and the front-rear direction (see the Y direction in FIG. 1) are different from each other. Note that the positions of the first and second display devices 11 and 12 in the left-right direction are the same as those for the first and second rhombus groups 11A and 12A by the first and second line sensor cameras 21 and 22, respectively. The first and second rhombus groups 11A and 12A are located on the imaging lines 21a and 22a (see FIG. 3) of the first and second line sensor cameras 21 and 22. It ’s like that)

  The graphic adjustment device 13 adjusts the position and rotation angle on the display screen of each of the first and second rhombus groups 11A and 12A.

The first and second line sensor cameras 21 and 22 are cameras in which light receiving elements are aligned in a straight line as described above. The first line sensor camera 21 and the second line sensor camera 22 are installed such that the imaging lines 21a and 22a extend in the left-right direction, and are displayed on the first and second display devices 11 and 12, respectively. The first and second rhombus groups 11A and 12A are imaged simultaneously.
The first line sensor camera 21 is fixed to the line sensor fixing base 24, and the second line sensor camera 22 is fixed to the line sensor adjusting base 25. The line sensor adjustment base 25 is installed on the line sensor fixing base 24.

  The image processing device 23 creates an image 30 (see FIG. 4) in which image data input from the first and second line sensor cameras 21 and 22 are arranged in time series, and displays the image 30 on the display unit 26.

  The line sensor adjustment base 25 includes a height adjustment mechanism, a tilt angle adjustment (rotation angle adjustment around the X axis shown in FIG. 1) mechanism, and a roll angle adjustment (rotation angle adjustment around the Y axis shown in FIG. 1) mechanism. The height, tilt angle, and roll angle of the second line sensor camera 22 are adjusted.

  The line sensor optical axis adjustment method according to the present embodiment will be described below with reference to FIGS.

  First, a method for adjusting the positions and rotation angles of the first and second rhombus groups 11A and 12A on the display screen will be described with reference to FIGS.

(Step S <b> 1) Imaging by the first line sensor camera 21 First, the first and second display devices 11 and 12 are imaged by the first line sensor camera 21. The image data picked up by the first line sensor camera 21 is arranged in a time series by the image processing device 23 and displayed on the display unit 26.

  Here, when the position indicated by the broken line in FIGS. 3A to 3D is imaged by the first line sensor camera 21, as shown in FIGS. 4A to 4D, respectively, 30, a first white portion 31 corresponding to the first rhombus group 11A is displayed on the left side, and a second white portion 32 corresponding to the second rhombus group 12A is displayed on the right side of the image. 3A to 3D, the alternate long and short dash lines 11Aa and 12Aa are the center lines of the first and second rhombus groups 11A and 12A.

  More specifically, as shown in FIGS. 3A and 3B, if the imaging line 21a of the first line sensor camera 21 and the center line 11Aa of the first rhombus group 11A do not coincide with each other, As shown in FIGS. 4A and 4B, a plurality of first white portions 31 corresponding to the first rhombus group 11A are displayed discontinuously on the image 30 (displayed in stripes). .

  On the other hand, as shown in FIGS. 3C and 3D, if the imaging line 21a of the first line sensor camera 21 and the center line 11Aa of the first rhombus group 11A match, As shown in FIGS. 4C and 4D, the first white portion 31 corresponding to the first rhombus group 11A is continuously displayed on the image 30. FIG.

(Step S2) Height adjustment of rhombus (first rhombus group 11A) of first display device 11 Next, the height of the first rhombus group 11A on the display screen is adjusted by the graphic adjustment device 13. Specifically, in order to increase the width of the first white portion 31, more specifically, any one of the plurality of first white portions 31 (for example, one located at the center in the left-right direction). ) To move the first rhombus group 11A in the vertical direction so that the width of the white portion 31 is maximum (in the example shown in FIGS. 3A and 3B, the first rhombus group 11A is moved upward. Move to).

(Step S3) Rotation adjustment of the rhombus (first rhombus group 11A) of the first display device 11 Next, the rotation angle on the display screen of the first rhombus group 11A is adjusted by the graphic adjustment device 13. Specifically, the first rhombus group 11A is rotated around an axis orthogonal to the display screen so that all the white portions 31 have the same width and increase in width on the image 30 (for example, FIG. 3B). In the example shown, the first rhombus group 11A is rotated counterclockwise around the left end).
If the first white portion 31 on the image 30 is not displayed in a continuous state even after adjusting the rotation angle of the first rhombus group 11A, the process returns to step S2.

  If the first white portion 31 on the image 30 is displayed in a continuous state in step S2 and step S3, the center line 11Aa of the first rhombus group 11A and the first line sensor camera 21 are displayed. Is determined to coincide with the imaging line 21a, and the process proceeds to step S4 described later.

(Step S4) Height and rotation adjustment of the rhombus (second rhombus group 12A) of the second display device 12 As in the above-described Step S1, Step S2, and Step S3, the second white portion 32 appears on the image 30. The height and rotation angle of the second rhombus group 12A are adjusted so that they are displayed in a continuous state.

  3D, the imaging line 21a of the first line sensor camera 21 and the center lines 11Aa and 12Aa of the first and second rhombus groups 11A and 12A are made to coincide with each other as shown in FIG. As shown in FIG. 4D, when the white portions 31 and 32 are displayed in a continuous state on the image 30, the adjustment of the first and second rhombus groups 11A and 12A is completed. At this time, the imaging line 21a of the first line sensor camera 21 and the center lines 11Aa and 12Aa of the first and second rhombus groups 11A and 12A are located on the same plane.

  Next, a method for adjusting the position and angle of the second line sensor camera 22 will be described.

(Step S5) Imaging with the Second Line Sensor Camera 22 First, the first and second display devices 11 and 12 are imaged with the second line sensor camera 22. Image data picked up by the second line sensor camera 22 is arranged in a time series by the image processing device 23 and displayed on the display unit 26. Note that the image 30 obtained from the image captured by the second line sensor camera 22 is also on the left side in the same manner as the image 30 obtained from the image captured by the first line sensor camera 21 shown in FIG. A first white portion 31 corresponding to one rhombus group 11A and a second white portion 32 corresponding to the second rhombus group 12A are displayed on the right side of the image.

(Step S6) Height Adjustment of the Second Line Sensor Camera 22 Next, the white portions 31 and 32 on the image 30 are widened by using the height adjustment mechanism of the line sensor adjustment base 25. The height of the second line sensor camera 22 is adjusted. When the width of the first white portion 31 or the second white portion 32 is narrowed by adjusting the height, the width of either the first white portion 31 or the second white portion 32 (for example, the second white portion 32). The height of the second line sensor camera 22 is moved in the vertical direction so that an arbitrary width of the white portion 32 of the white portion 32 increases.

(Step S7) Tilt Angle Adjustment of the Second Line Sensor Camera 22 Next, the width of the first and second white portions 31 and 32 on the image 30 is determined using the tilt angle adjustment mechanism of the line sensor adjustment base 25. The tilt angle of the second line sensor camera 22 is adjusted so as to increase on average. When the width of the first white portion 31 or the second white portion 32 is narrowed by adjusting the tilt angle, the width of either the first white portion 31 or the second white portion 32 (for example, the first white portion 31 or 32) The tilt angle of the second line sensor camera 22 is adjusted so that the width of any one of the white portions 31 of the second line sensor camera 22 becomes wider. If the widths of the first white portion 31 and the second white portion 32 are narrowed by adjusting the tilt angle, the process returns to step S6 described above.

(Step S8) Roll Angle Adjustment of Second Line Sensor Camera 22 Using the roll angle adjustment mechanism of the line sensor adjustment table 25, the widths of the first and second white portions 31 and 32 on the image 30 are averaged. The roll angle of the second line sensor camera 22 is adjusted so as to increase. When the width of the first white portion 31 or the second white portion 32 is reduced by adjusting the roll angle, the width of either the first white portion 31 or the second white portion 32 (for example, the first white portion 31 or 32) The roll angle of the second line sensor camera 22 is adjusted so as to increase the width of any one of the white portions 31. The first white portion 31 and the second white portion are adjusted by adjusting the roll angle. When the width of 32 becomes narrower, the process returns to step S6 described above.

  With the above processing, as shown in FIG. 3D, the imaging line 22a of the second line sensor camera 22 and the center lines 11Aa and 12Aa of the first and second rhombus groups 11A and 12A are made to coincide with each other. As shown in FIG. 4D, when the white portions 31 and 32 are displayed in a continuous state on the image 30, the adjustment of the second line sensor camera 22 is finished. At this time, the imaging lines 21a and 22a of the first and second line sensor cameras 21 and 22 are positioned on a straight line.

  When the adjustment of the position and angle of the second line sensor camera 22 is completed, the posture of the second line sensor camera 22 is fixed by the line sensor adjustment base 25, and the first and second line sensor cameras 21 and 22, The sensor fixing base 24 and the line sensor adjustment base 25 are integrally moved and installed as a stereo measuring device. For example, when applied as a stereo measurement device disclosed in JP 2012-52939 A, the stereo measurement device is installed on the roof of a vehicle.

  According to the line sensor optical axis adjusting apparatus and the line sensor optical axis adjusting method according to the present embodiment configured as described above, the following operational effects can be obtained.

  That is, the first and second display devices 11 and 12 are installed at different positions on the front, rear, left, and right, and based on images obtained by imaging the first and second rhombus groups 11A and 12A by the first line sensor camera 21. Since the first and second rhombus groups 11A and 12A are adjusted on the display screens of the first and second display devices 11 and 12, the position and angle of the first line sensor camera 21 are adjusted. Adjustment is not necessary, and the optical axis adjustment of the line sensor camera can be simplified.

  Further, the positional relationship of the three straight lines between the center lines 11Aa and 12Aa of the first and second rhombus groups 11A and 12A and the imaging line 21a (the light receiving element arrangement direction) of the first line sensor camera 21 is a twisted position. In some cases, it is difficult to position the three straight lines on the same plane only by adjusting the optical axis of the first line sensor camera 21, whereas in the present embodiment, the fixed first line sensor camera. In contrast, the first and second rhombus groups 11A and 12A can be adjusted to adjust the height and rotation angle, thereby eliminating the twist of the three lines and positioning the three lines on the same plane. Stereo measurement can be performed with high accuracy and ease.

  In addition, since the first and second rhombus groups 11A and 12A are displayed on the first and second display devices 11 and 12, respectively, the first and second rhombus groups 11A and 12A emit light. When the rhombus shape is imaged by the first and second line sensor cameras 21 and 22, no illumination is required, which leads to simplification of the apparatus.

  In addition, when the first and second display devices 11 and 12 are arranged at the same position in the front-rear direction, the imaging lines (scan planes) of the first and second line sensor cameras 21 and 22 may intersect. However, since the first and second display devices 11 and 12 are arranged at different positions in the front-rear direction in this embodiment, the imaging lines (scanning surfaces) 21a of the first and second line sensor cameras 21 and 22 are used. , 22a can be reliably positioned on the same plane.

  In the present embodiment, an example in which a liquid crystal monitor is used as the display devices 11 and 12 has been described. However, the display devices 11 and 12 are not limited to the liquid crystal monitor, and a screen of a notebook personal computer or the like can be installed relatively easily. Any display device can be used as long as it can display. For example, it is more efficient to connect a multi-monitor to a notebook personal computer to form two display devices.

  In this embodiment, the first line sensor camera 21 is fixed to the line sensor fixing base 24, while the line sensor adjustment base 25 adjusts the height, tilt angle, and roll angle of the second line sensor camera 22. However, the present invention is not limited to the above-described embodiment. For example, the first line sensor camera 21 and the second line sensor camera 22 are installed on different line sensor adjustment bases, and the line After confirming the state of the images captured by the sensor cameras 21 and 22, one line sensor camera 21 or 22 is fixed (no adjustment is performed), and the other line sensor camera 22 or 21 is raised by a line sensor adjustment base. Adjustment of the tilt angle and roll angle is not performed for one line sensor camera, and other line sensors are not adjusted. Sakamera only the height, it is sufficient to adjust the tilt angle and the roll angle.

  In the present embodiment, a rhombus is applied as a mark pattern to be displayed on the display devices 11 and 12, but the mark pattern is not limited to the rhombus, and the width in the left-right direction is directed to the upper and lower ends. As long as the shape decreases continuously, the shape may be an ellipse or other shapes. Moreover, although the example which has five rhombus (mark pattern) as a figure group was shown in the present Example, the mark pattern should just be two or more.

  In the present embodiment, the line sensor adjustment base 25 is provided with a height adjustment mechanism, a tilt angle adjustment mechanism, and a roll angle adjustment mechanism. The rotation angle adjustment mechanism around the Z axis shown in FIG.

DESCRIPTION OF SYMBOLS 11 1st display apparatus 11A 1st rhombus group 11Aa Center line of 1st rhombus group 12 2nd display apparatus 12A 2nd rhombus group 12Aa Center line of 2nd rhombus group 13 Graphic adjustment apparatus 21 1st Line sensor camera 21a Image line of first line sensor camera 22 Second line sensor camera 22a Image line of second line sensor camera 23 Image processing device 24 Line sensor fixing base 25 Line sensor adjustment base 26 Display unit 30 Image 31 , 32 White part

Claims (8)

A first display device for displaying a first graphic group in which a plurality of mark patterns in which the width in the left-right direction continuously decreases toward the upper and lower end portions are continuously arranged in the left-right direction;
A second display device that displays a second graphic group that is installed in different positions in the front-rear direction and the left-right direction from the first display device, and in which a plurality of the mark patterns are continuously arranged in the left-right direction;
One line sensor camera that simultaneously images the first graphic group and the second graphic group;
The one line sensor camera is installed at different positions in the left-right direction, and one or more other line sensor cameras that simultaneously image the first graphic group and the second graphic group;
The positions and rotation angles of the first graphic group and the second graphic group are set so that the vertical center lines of the first and second graphic groups coincide with the imaging line of the one line sensor camera. A figure adjustment device that can be adjusted individually,
A line sensor adjustment device capable of adjusting a position and an angle of the other line sensor camera so that an imaging line of the other line sensor camera coincides with a center line of the first and second graphic groups. A line sensor optical axis adjusting device characterized by the above. 2. The line sensor optical axis adjustment according to claim 1, wherein the line sensor adjustment device is a line sensor adjustment base capable of adjusting a vertical position, a tilt angle, and a roll angle of the other line sensor camera. apparatus. The line sensor optical axis adjusting device according to claim 2, further comprising a line sensor fixing base capable of fixing the one line sensor camera and the line sensor adjusting base. The line sensor optical axis adjusting device according to any one of claims 1 to 3, wherein the mark pattern is a rhombus. The first display device displays a first graphic group in which a plurality of mark patterns in which the width in the left-right direction continuously decreases toward the upper and lower end portions are continuously arranged in the left-right direction,
A second display device installed at a position different from the first display device in the front-rear direction and the left-right direction displays a second graphic group in which a plurality of the mark patterns are continuously arranged in the left-right direction. ,
The first figure group and the second figure group are simultaneously imaged by one line sensor camera,
The first graphic group and the second graphic group are simultaneously imaged by one or more other line sensor cameras installed at different positions in the left-right direction from the one line sensor camera,
Based on an image captured by the one line sensor camera, the first graphic group and the second graphic group have a vertical center line that coincides with an imaging line of the one line sensor camera. Adjusting the position and rotation angle of one graphic group and the second graphic group,
Based on the images of the first graphic group and the second graphic group whose position and rotation angle are adjusted by the other line sensor camera, the imaging lines of the other line sensor camera are the first and the second graphic sensors. A line sensor optical axis adjustment method, wherein the position and angle of the other line sensor camera are adjusted so as to coincide with the center line of the second graphic group. 6. The position and angle of the other line sensor camera are adjusted by a line sensor adjustment base capable of adjusting the vertical position, tilt angle, and roll angle of the other line sensor camera. Line sensor optical axis adjustment method. The line sensor optical axis adjustment method according to claim 6, wherein the one line sensor camera and the line sensor adjustment base are fixed by a line sensor fixing base. The line sensor optical axis adjustment method according to claim 5, wherein the mark pattern is a rhombus.

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