Tunnel photogrammetry device and use method thereof

Abstract

The invention discloses a tunnel photogrammetry device which comprises a tripod, a flashlight, a camera, a first adjusting mechanism and a second adjusting mechanism, the first adjusting mechanism and the second adjusting mechanism are movably connected to the tripod, the flashlight is installed on the first adjusting mechanism, the camera is installed on the second adjusting mechanism, and a glass slide is arranged on a camera screen. And overlapping ratio scale marks are carved on the slide. The device has the advantages of simple structure, convenience in operation and capability of ensuring the image overlapping rate.

Description

Technical Field

[0001] The present invention relates to the technical field, and in particular to a tunnel photogrammetry device and a use method thereof. Background Art

[0002] When performing photogrammetry in a tunnel, the overlap rate of two adjacent images needs to be controlled to ensure modeling quality. However, due to poor lighting conditions in the tunnel, the surface texture features of the tunnel cannot be clearly observed through the camera screen or viewfinder, and it is difficult to visually control the overlap rate of two adjacent images. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a tunnel photogrammetry device which has a simple structure, is easy to operate and can ensure image overlap rate, and a method for using the same.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A tunnel photogrammetry device comprises a tripod, a flashlight, a camera, a first adjustment mechanism and a second adjustment mechanism, wherein the first adjustment mechanism and the second adjustment mechanism are movably connected to the tripod, the flashlight is mounted on the first adjustment mechanism, the camera is mounted on the second adjustment mechanism, a glass slide is arranged on the camera screen, and overlap rate scale lines are engraved on the glass slide.

[0006] As a further improvement of the above technical solution:

[0007] The glass slide is movably connected to the camera screen via a movable frame.

[0008] The movable frame comprises a fixed outer frame, a movable middle frame and a movable inner frame. The fixed outer frame is fixedly mounted on the screen of the camera, the movable middle frame is slidably mounted in the fixed outer frame and can move along the length direction of the fixed outer frame, the movable inner frame is slidably mounted in the movable middle frame and can move along the width direction of the movable middle frame, and the glass slide is embedded in the movable inner frame.

[0009] The size of the fixed outer frame is larger than the screen size of the camera, the length of the moving middle frame is 1 / 2 of the length of the fixed outer frame, the width of the moving middle frame is consistent with the inner width of the fixed outer frame, the length of the moving inner frame is consistent with the inner length of the moving middle frame, and the width of the moving inner frame is 1 / 2 of the width of the moving middle frame.

[0010] The tripod comprises legs and a central axis, a first rotating axis and a second rotating axis are coaxially mounted on the central axis, the first adjusting mechanism is mounted on the first rotating axis and can rotate horizontally around the first rotating axis, and the second adjusting mechanism is mounted on the second rotating axis and can rotate horizontally around the second rotating axis.

[0011] The adjustment mechanism includes a horizontal turntable, which is set on a rotating shaft. The horizontal turntable is connected to a right-angle connecting rod, and the right-angle connecting rod is connected to a vertical turntable. A vertical rotating shaft is coaxially installed in the vertical turntable. The vertical rotating shaft can rotate or axially slide in the vertical turntable, and a clamp for clamping a flashlight is clamped on the vertical rotating shaft.

[0012] The horizontal rotating disk is provided with a horizontal limit knob, and the vertical rotating disk is provided with a vertical limit knob.

[0013] The second adjustment mechanism includes a horizontal turntable 2, which is mounted on a second rotating shaft. The horizontal turntable 2 is connected to a vertical rotating shaft 2, and a vertical turntable 2 is mounted on the vertical rotating shaft 2. The vertical turntable 2 can rotate around the vertical rotating shaft 2. The vertical turntable 2 is connected to a crank for rotating the vertical turntable 2, and the vertical turntable 2 is also connected to a gimbal for carrying a camera.

[0014] The platform is provided with connecting bolts for connecting the camera.

[0015] The second horizontal rotating disk is provided with a second horizontal limit knob, and the second vertical rotating disk is provided with a second vertical limit knob.

[0016] The vertical rotating shaft 1 is coaxially arranged with the vertical rotating shaft 2. The vertical rotating shaft 1 is provided with a coupling key, and the vertical rotating shaft 2 is provided with a coupling groove matching the coupling key.

[0017] A method for using the tunnel photogrammetry device according to any one of claims 1 to 11, comprising the following steps:

[0018] S1: Draw the overlap rate scale lines on the slide;

[0019] S2: embed the glass slide in the movable inner frame and fix the fixed outer frame on the screen of the camera;

[0020] S3: Install the adjustment mechanism 1 and the adjustment mechanism 2 on the tripod in sequence, and then fix the flashlight and the camera on the adjustment mechanism 1 and the adjustment mechanism 2 respectively;

[0021] S4: Adjust the horizontal turntable 1, horizontal turntable 2, vertical shaft 1 and vertical turntable 2 so that the flashlight and camera are horizontal and the optical axes are parallel. Move the vertical shaft 1 axially until the coupling key engages with the coupling groove on the vertical shaft 2. Lock and fix the limit knobs.

[0022] S5: Turn on the flashlight, look at the camera screen, move the slide so that the origin of the slide coincides with the flashlight spot, then turn off the flashlight and take a picture;

[0023] S6: Move the vertical shaft 1 axially until the coupling key is completely separated from the coupling groove on the vertical shaft 2, unlock the horizontal limit knob 2 and the vertical limit knob 2, turn on the flashlight, adjust the camera posture and monitor the moving range of the light spot so that it does not exceed the range of the overlap rate scale line, lock the horizontal limit knob 2 and the vertical limit knob 2 after the camera is adjusted in place, turn off the flashlight, and shoot an image;

[0024] S7: Unlock the horizontal limit knob 1 and the vertical limit knob 1, adjust the vertical shaft 1 so that its coupling key engages with the coupling groove on the vertical shaft 2, and then lock the horizontal limit knob 1 and the vertical limit knob 1;

[0025] S8: Repeat steps S4 to S6 until the job is completed.

[0026] As a further improvement of the above technical solution:

[0027] In step S1, the overlap rate scale line drawing method is as follows:

[0028] The overlap ratio c is taken as 90%, 80%, 70%, 60% and 50% respectively;

[0029] Substitute each preset overlap rate c into the equation: y = (c×a×b+b×xa×b) / (xa), where a is the length of the camera screen and b is the width of the camera screen, and obtain multiple curves and draw them on the glass slide to form overlap rate drawing lines.

[0030] In step S6, the glass slide may be flipped and adjusted according to the moving direction of the light spot.

[0031] Compared with the prior art, the advantages of the present invention are:

[0032] When the tunnel photogrammetry device of the present invention is used, the flashlight and the camera are connected to the tripod through the first integral mechanism and the second adjustment mechanism respectively, and a light spot is formed on the screen of the camera by turning on the flashlight. When the camera is moved for photography, the light spot is kept within the overlap rate scale line range on the glass slide, thereby ensuring the image overlap rate. The device has a simple structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the tunnel photogrammetry device of the present invention.

[0034] Figure 2 It is an exploded view of the tunnel photogrammetry device of the present invention.

[0035] Figure 3 It is a structural schematic diagram of the adjustment mechanism of the present invention.

[0036] Figure 4 It is a structural schematic diagram of the second adjustment mechanism of the present invention.

[0037] Figure 5 It is a schematic diagram of the mobile frame structure of the present invention.

[0038] The symbols in the figure represent:

[0039] 1. Tripod; 11. Leg; 12. Center axis; 121. Rotating axis 1; 122. Rotating axis 2; 2. Flashlight; 3. Camera; 4. Adjusting mechanism 1; 41. Horizontal turntable 1; 411. Horizontal limit knob 1; 42. Right-angle connecting rod; 43. Vertical turntable 1; 431. Vertical limit knob 1; 44. Vertical rotating axis 1; 441. Coupling key; 5. Adjusting mechanism 2; 51. Horizontal turntable 2; 511. Horizontal limit knob 2; 52. Vertical rotating axis 2; 521. Coupling slot; 53. Vertical turntable 2; 531. Vertical limit knob 2; 54. Crank handle; 6. Glass slide; 61. Overlap rate scale line; 7. Moving frame; 71. Fixed outer frame; 72. Moving middle frame; 73. Moving inner frame; 8. Clamp; 9. Pan head; 91. Connecting bolts. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] like Figures 1 to 5 As shown, the tunnel photogrammetry device of this embodiment includes a tripod 1, a flashlight 2, a camera 3, an adjustment mechanism 1 4 and an adjustment mechanism 2 5. The adjustment mechanism 1 4 and the adjustment mechanism 2 5 are movably connected to the tripod 1, the flashlight 2 is mounted on the adjustment mechanism 1 4, the camera 3 is mounted on the adjustment mechanism 2 5, and a glass slide 6 is provided on the screen of the camera 3, and overlap rate scale lines 61 are engraved on the glass slide 6. When in use, the flashlight 2 and the camera 3 are respectively connected to the tripod 1 through the entire mechanism 1 4 and the adjustment mechanism 2 5, and a light spot is formed on the screen of the camera 3 by turning on the flashlight 2. When the camera 3 is moved for photography, the light spot is kept within the overlap rate scale line 61 on the glass slide 6, so as to ensure the image overlap rate. The structure is simple and the operation is convenient.

[0042] In this embodiment, the glass slide 6 is movably connected to the screen of the camera 3 through the movable frame 7. The movable frame 7 includes a fixed outer frame 71, a movable middle frame 72 and a movable inner frame 73. The fixed outer frame 71 is fixed on the screen of the camera 3. The movable middle frame 72 is slidably mounted in the fixed outer frame 71 and can move along the length direction of the fixed outer frame 71. The movable inner frame 73 is slidably mounted in the movable middle frame 72 and can move along the width direction of the movable middle frame 72. The glass slide 6 is embedded in the movable inner frame 73. In this structure, the glass slide 7 is embedded in the movable inner frame 73 so that it can move up and down in the movable middle frame 72 following the movable inner frame 73, and the movable middle frame 72 can move left and right in the fixed outer frame 71. In this way, the glass slide 6 can move up and down and left and right relative to the screen of the camera 3, which is convenient for adjustment.

[0043] In this embodiment, the size of the fixed outer frame 71 is larger than the screen size of the camera 3, the length of the movable middle frame 72 is 1 / 2 of the length of the fixed outer frame 71, the width of the movable middle frame 72 is consistent with the inner width of the fixed outer frame 71, the length of the movable inner frame 73 is consistent with the inner length of the movable middle frame 72, and the width of the movable inner frame 73 is 1 / 2 of the width of the movable middle frame 72.

[0044] In this embodiment, the tripod 1 includes legs 11 and a central axis 12, on which a first rotation axis 121 and a second rotation axis 122 are coaxially mounted, and the first adjustment mechanism 4 is mounted on the first rotation axis 121 and can rotate horizontally around it, and the second adjustment mechanism 5 is mounted on the second rotation axis 122 and can rotate horizontally around it. In this arrangement, both the first adjustment mechanism 4 and the second adjustment mechanism 2 can rotate horizontally around the central axis 12, thereby adjusting the postures of the flashlight 2 and the camera 3.

[0045] In this embodiment, the adjustment mechanism 4 includes a horizontal turntable 41, which is sleeved on the rotating shaft 121, and the horizontal turntable 41 is connected to a right-angle connecting rod 42, and the right-angle connecting rod 42 is connected to a vertical turntable 43, and a vertical rotating shaft 44 is coaxially installed in the vertical turntable 43, and the vertical rotating shaft 44 can rotate or slide axially in the vertical turntable 43, and a clamp 8 for clamping the flashlight 2 is clamped on the vertical rotating shaft 44. In this structure, the horizontal turntable 41 can rotate around the rotating shaft 121 in the horizontal direction, so that the flashlight 2 has the ability to rotate and adjust in the horizontal direction, and then connected to the vertical turntable 43 through the right-angle connecting rod 41, the vertical rotating shaft 44 can rotate in the vertical turntable 43, so that the flashlight 2 has the ability to rotate and adjust in the vertical direction.

[0046] In this embodiment, a horizontal limit knob 411 is provided on the horizontal turntable 41, and a vertical limit knob 431 is provided on the vertical turntable 43. By setting the horizontal limit knob 411 and the vertical limit knob 431 to lock, the flashlight 2 is fixed to avoid deviation in the image overlap rate.

[0047] In this embodiment, the adjustment mechanism 2 5 includes a horizontal turntable 2 51, which is sleeved on the second rotating shaft 122, and the horizontal turntable 2 51 is connected to the vertical rotating shaft 2 52, and the vertical turntable 2 53 is sleeved on the vertical rotating shaft 2 52. The vertical turntable 2 53 can rotate around the vertical rotating shaft 2 52, and the vertical turntable 2 53 is connected to a crank 54 for rotating the vertical turntable 2 53, and the vertical turntable 2 53 is also connected to a pan / tilt 9 for carrying the camera 3. In this structure, the horizontal turntable 2 51 can rotate around the second rotating shaft 122 in the horizontal direction, so that the camera 3 has the ability to rotate and adjust in the horizontal direction, and the vertical turntable 2 53 can rotate around the second rotating shaft 122 in the vertical direction, so that the camera 3 has the ability to rotate and adjust in the vertical direction, and the vertical turntable 2 53 can be rotated in the vertical direction around the second rotating shaft 52, so that the camera 3 has the ability to rotate and adjust in the vertical direction, and the vertical turntable 2 53 is rotated by the crank 54, which is easy to operate.

[0048] In this embodiment, the platform 9 is provided with connecting bolts 91 for connecting the camera 3. The camera 3 and the platform 9 are connected by the connecting bolts 91, and the connection is stable and reliable, and is easy to disassemble.

[0049] In this embodiment, the horizontal turntable 51 is provided with a horizontal limit knob 511, and the vertical turntable 53 is provided with a vertical limit knob 531. The horizontal limit knob 511 and the vertical limit knob 531 are locked to fix the camera 3, thereby ensuring the stability of the camera 3 when shooting and ensuring the overlap rate.

[0050] In this embodiment, the vertical rotation shaft 1 44 is coaxially arranged with the vertical rotation shaft 2 52, a coupling key 441 is arranged on the vertical rotation shaft 1 44, and a coupling groove 521 matching the coupling key 441 is arranged on the vertical rotation shaft 2 52. In this structure, the vertical rotation shaft 1 44 and the vertical rotation shaft 2 52 are connected by the coupling key 441 and the coupling groove 521, so as to quickly position the flashlight 2 and the camera 3 so that the optical axes are parallel.

[0051] The method for using the tunnel photogrammetry device of this embodiment includes the following steps:

[0052] S1: Draw overlap rate scale lines 61 on the glass slide 6;

[0053] S2: embed the glass slide 6 into the movable inner frame 73 and fix the fixed outer frame 71 on the screen of the camera 3;

[0054] S3: Install the adjustment mechanism 1 4 and the adjustment mechanism 2 5 on the tripod 1 in sequence, and then fix the flashlight 2 and the camera 3 on the adjustment mechanism 1 4 and the adjustment mechanism 2 5 respectively;

[0055] S4: Adjust the horizontal turntable 1 41, the horizontal turntable 2 51, the vertical shaft 1 44 and the vertical turntable 2 53 so that the flashlight 2 and the camera 3 are in a horizontal state and the optical axes are parallel, and move the vertical shaft 1 44 axially until the coupling key 441 engages with the coupling groove 521 on the vertical shaft 2 52, and lock and fix the limit knobs;

[0056] S5: Turn on the flashlight 2, look at the screen of the camera 3, move the glass slide 6 so that the origin of the glass slide 6 coincides with the light spot of the flashlight 2, then turn off the flashlight 2 and shoot an image;

[0057] S6: Move the vertical shaft 1 44 axially until the coupling key 441 is completely separated from the coupling groove 521 on the vertical shaft 2 52, unlock the horizontal limit knob 2 511 and the vertical limit knob 2 531, turn on the flashlight 2, adjust the posture of the camera 3 and monitor the moving range of the light spot so that it does not exceed the range of the overlap rate scale line 61, lock the horizontal limit knob 2 511 and the vertical limit knob 2 531 after the camera 3 is adjusted in place, turn off the flashlight 2, and shoot an image;

[0058] S7: Unlock the horizontal limit knob 411 and the vertical limit knob 431, adjust the vertical shaft 44 so that its coupling key 441 engages with the coupling groove 521 on the vertical shaft 52, and then lock the horizontal limit knob 411 and the vertical limit knob 431;

[0059] S8: Repeat steps S4 to S6 until the job is completed.

[0060] This method sets a glass slide 6 with overlap rate scale lines 61 on the screen of the camera 3, forms a light spot for reference through the flashlight 2, and keeps the light spot within the range of the overlap rate scale lines 61 when the camera 2 is moving to take pictures, thereby ensuring the image overlap rate. The operation is simple and convenient.

[0061] In this embodiment, in step S1, the overlapping rate scale line 61 is drawn as follows:

[0062] The overlap ratio c is taken as 90%, 80%, 70%, 60% and 50% respectively;

[0063] Substitute each preset overlap rate c into the equation: y = (c×a×b+b×xa×b) / (xa), where a is the length of the camera 3 screen, and b is the width of the camera 3 screen, to obtain multiple curves and draw them on the glass slide 6 to form overlap rate drawing lines 61.

[0064] In this embodiment, in step S6, the glass slide 6 can be flipped and adjusted according to the moving direction of the light spot. In this step, the installation direction of the glass slide 6 can be flipped up and down, left and right, or rotated 180° according to the original position, and the installation direction means that the opposite direction of the moving direction of the camera 3 is the moving direction of the light spot, and the direction of the origin of the glass slide 6 pointing to the overlap rate scale line 61 is consistent with the moving direction of the light spot.

[0065] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A tunnel photogrammetry device, characterized in that: The invention comprises a tripod (1), a flashlight (2), a camera (3), an adjustment mechanism 1 (4) and an adjustment mechanism 2 (5), wherein the adjustment mechanism 1 (4) and the adjustment mechanism 2 (5) are movably connected to the tripod (1), the flashlight (2) is mounted on the adjustment mechanism 1 (4), the camera (3) is mounted on the adjustment mechanism 2 (5), and a glass slide (6) is arranged on the screen of the camera (3), and overlap rate scale lines (61) are engraved on the glass slide (6).

2. The tunnel photogrammetry device according to claim 1, characterized in that: The glass slide (6) is movably connected to the screen of the camera (3) via a movable frame (7).

3. The tunnel photogrammetry device according to claim 2, characterized in that: The movable frame (7) comprises a fixed outer frame (71), a movable middle frame (72) and a movable inner frame (73); the fixed outer frame (71) is fixedly mounted on the screen of the camera (3); the movable middle frame (72) is slidably mounted in the fixed outer frame (71) and can move along the length direction of the fixed outer frame (71); the movable inner frame (73) is slidably mounted in the movable middle frame (72) and can move along the width direction of the movable middle frame (72); and the glass slide (6) is embedded in the movable inner frame (73).

4. The tunnel photogrammetry device according to claim 3, characterized in that: The size of the fixed outer frame (71) is larger than the screen size of the camera (3); the length of the movable middle frame (72) is 1 / 2 of the length of the fixed outer frame (71); the width of the movable middle frame (72) is consistent with the inner width of the fixed outer frame (71); the length of the movable inner frame (73) is consistent with the inner length of the movable middle frame (72); and the width of the movable inner frame (73) is 1 / 2 of the width of the movable middle frame (72).

5. The tunnel photogrammetry device according to any one of claims 1 to 4, characterized in that: The tripod (1) comprises legs (11) and a central axis (12); a first rotating shaft (121) and a second rotating shaft (122) are coaxially mounted on the central axis (12); the first adjusting mechanism (4) is mounted on the first rotating shaft (121) and can rotate horizontally around the first rotating shaft (121); and the second adjusting mechanism (5) is mounted on the second rotating shaft (122) and can rotate horizontally around the second rotating shaft (122).

6. The tunnel photogrammetry device according to claim 5, characterized in that: The adjustment mechanism (4) comprises a horizontal turntable (41), the horizontal turntable (41) is sleeved on a rotating shaft (121), the horizontal turntable (41) is connected to a right-angle connecting rod (42), the right-angle connecting rod (42) is connected to a vertical turntable (43), a vertical rotating shaft (44) is coaxially installed in the vertical turntable (43), the vertical rotating shaft (44) can rotate or axially slide in the vertical turntable (43), and a clamp (8) for clamping the flashlight (2) is clamped on the vertical rotating shaft (44).

7. The tunnel photogrammetry device according to claim 6, characterized in that: The horizontal rotating disk (41) is provided with a horizontal limit knob (411), and the vertical rotating disk (43) is provided with a vertical limit knob (431).

8. The tunnel photogrammetry device according to claim 7, characterized in that: The second adjustment mechanism (5) comprises a second horizontal turntable (51), the second horizontal turntable (51) is sleeved on the second rotating shaft (122), the second horizontal turntable (51) is connected to the second vertical rotating shaft (52), the second vertical turntable (53) is sleeved on the second vertical rotating shaft (52), the second vertical turntable (53) can rotate around the second vertical rotating shaft (52), the second vertical turntable (53) is connected to a crank (54) for rotating the second vertical turntable (53), and the second vertical turntable (53) is also connected to a pan / tilt platform (9) for carrying a camera (3).

9. The tunnel photogrammetry device according to claim 8, characterized in that: The pan head (9) is provided with a connecting bolt (91) for connecting with the camera (3).

10. The tunnel photogrammetry device according to claim 9, characterized in that: The second horizontal rotating disk (51) is provided with a second horizontal limit knob (511), and the second vertical rotating disk (53) is provided with a second vertical limit knob (531).

11. The tunnel photogrammetry device according to claim 10, characterized in that: The vertical rotating shaft 1 (44) is coaxially arranged with the vertical rotating shaft 2 (52); the vertical rotating shaft 1 (44) is provided with a coupling key (441); the vertical rotating shaft 2 (52) is provided with a coupling groove (521) matching the coupling key (441).

12. A method for using the tunnel photogrammetry device according to any one of claims 1 to 11, characterized in that: The following steps are involved: S1: Drawing overlap rate scale lines (61) on the glass slide (6); S2: embedding the glass slide (6) in the movable inner frame (73) and fixing the fixed outer frame (71) on the screen of the camera (3); S3: Install the adjustment mechanism 1 (4) and the adjustment mechanism 2 (5) on the tripod (1) in sequence, and then fix the flashlight (2) and the camera (3) on the adjustment mechanism 1 (4) and the adjustment mechanism 2 (5) respectively; S4: Adjust the horizontal turntable 1 (41), the horizontal turntable 2 (51), the vertical shaft 1 (44) and the vertical turntable 2 (53) so that the flashlight (2) and the camera (3) are in a horizontal state and the optical axes are parallel, and the vertical shaft 1 (44) is moved axially until the coupling key (441) is engaged with the coupling groove (521) on the vertical shaft 2 (52), and the limit knobs are locked and fixed; S5: Turn on the flashlight (2), look at the screen of the camera (3), move the glass slide (6) so that the origin of the glass slide (6) coincides with the light spot of the flashlight (2), then turn off the flashlight (2) and shoot an image; S6: Move the vertical rotation shaft 1 (44) axially until the coupling key (441) is completely separated from the coupling groove (521) on the vertical rotation shaft 2 (52), unlock the horizontal limit knob 2 (511) and the vertical limit knob 2 (531), turn on the flashlight (2), adjust the posture of the camera (3) and monitor the moving range of the light spot so that it does not exceed the range of the overlap rate scale line (61), lock the horizontal limit knob 2 (511) and the vertical limit knob 2 (531) after the camera (3) is adjusted in place, turn off the flashlight (2), and shoot an image; S7: Unlock the horizontal limit knob 1 (411) and the vertical limit knob 1 (431), adjust the vertical shaft 1 (44) so ​​that its coupling key (441) engages with the coupling groove (521) on the vertical shaft 2 (52), and then lock the horizontal limit knob 1 (411) and the vertical limit knob 1 (431); S8: Repeat steps S4 to S6 until the job is completed.

13. The method for using the tunnel photogrammetry device according to claim 12, characterized in that: In step S1, the overlapping rate scale line (61) is drawn as follows: The overlap ratio c is taken as 90%, 80%, 70%, 60% and 50% respectively; Substitute each preset overlap rate c into the equation: y=(c×a×b+b×xa×b) / (xa), where a is the length of the camera (3) screen and b is the width of the camera (3) screen, to obtain multiple curves and plot them on the glass slide (6) to form overlap rate plotting lines (61).

14. The method for using the tunnel photogrammetry device according to claim 13, characterized in that: In step S6, the glass slide (6) can be flipped and adjusted according to the moving direction of the light spot.

Images