A bracket for close-range photogrammetry of verticality

Abstract

The present application relates to the field of municipal highway inspection tools, and discloses a bracket for measuring verticality by close-range photography, which includes a frame, a horizontal adjustment seat for mounting a camera is movably arranged on the frame, a cavity is arranged in the horizontal adjustment seat, a filling liquid is arranged in the cavity, a float is arranged on the liquid surface of the filling liquid, a counterweight is arranged at the lower end of the float, a multi-dimensional reflective surface is arranged at the upper end of the float, a light-emitting component for projecting a light beam to the reflective surface is arranged in the horizontal adjustment seat, and a semi-transparent horizontal calibration part for receiving the light beam emitted by the light-emitting component and then reflected by the multi-dimensional reflective surface is arranged on the peripheral side of the horizontal adjustment seat; when the horizontal adjustment seat is in a horizontal posture, the light beam emitted by the light-emitting component is reflected by the multi-dimensional reflective surface to the semi-transparent horizontal calibration part. The present application has the effect of conveniently and accurately detecting the horizontal posture.

Description

Technical Field

[0001] The present application relates to the field of municipal highway inspection tools, and in particular to a bracket for close-range photography to measure verticality. Background Art

[0002] With the development of science and technology in recent years, close-range photogrammetry technology has gradually been applied to the field of municipal construction. By collecting image information of buildings from multiple angles and analyzing the data, the verticality of buildings can be surveyed more accurately.

[0003] In close-range photogrammetry technology, the scale ratio of buildings in the image is particularly large, so slight changes in the building in the image will have a huge impact on the survey results. This requires that during the verticality survey, the camera used to acquire the image must perform image acquisition in a high-precision horizontal state to effectively ensure the accuracy of the verticality results of the close-range photogrammetry survey.

[0004] At present, the horizontal posture verification mostly adopts the horizontal liquid level method, that is, by reading whether the liquid surface at multiple positions is parallel to a specific scale line, it is judged whether the current posture is horizontal. However, the liquid surface in the tubular volume is low in the middle and high on the sides. Reading the position of the liquid surface from the side is very likely to produce errors due to the different perspectives of the human eye, so it is impossible to achieve high-precision horizontal posture verification. Summary of the invention

[0005] In order to detect horizontal posture conveniently and with high precision, the present application provides a bracket for close-range photography to measure verticality.

[0006] The present application provides a bracket for close-range photogrammetry verticality measurement using the following technical solution:

[0007] A bracket for measuring verticality of close-range photography, comprising a frame body, a horizontal adjustment seat for mounting a camera movably arranged on the frame body, a cavity arranged in the horizontal adjustment seat, a filling liquid arranged in the cavity, a floating ball arranged on the liquid surface of the filling liquid, a counterweight arranged at the lower end of the floating ball, a multi-dimensional reflecting surface arranged at the upper end of the floating ball, a light emitting member for projecting a light beam to the reflecting surface arranged in the horizontal adjustment seat, and a semi-transparent horizontal calibration portion for receiving the light beam emitted by the light emitting member and then reflected by the multi-dimensional reflecting surface arranged on the peripheral side of the horizontal adjustment seat;

[0008] When the horizontal adjustment seat is in a horizontal posture, the light beam emitted by the light-emitting component is reflected by the multi-dimensional reflective surface to the semi-transparent horizontal checking part.

[0009] By adopting the above-mentioned technical scheme, when in use, the camera used for close-up shooting and collecting images is positioned and installed on the horizontal adjustment seat, and the posture of the horizontal adjustment seat is adjusted. At the same time, it is observed whether there is a light spot on the semi-transparent horizontal verification part, until the light beam emitted by the light-emitting part is reflected by the multi-dimensional reflective surface to the semi-transparent horizontal verification part at a specific position, which proves that the horizontal adjustment seat has reached a high-precision horizontal state; the present application adopts the method of observing whether there is a light spot on the semi-transparent horizontal verification part to determine whether the horizontal adjustment seat has reached a high-precision horizontal posture, thereby reducing the difficulty of the judgment operation. In addition, the present application uses the reflection principle to detect the horizontal posture, and the detection accuracy is higher, because a slight change in the posture of the float will cause a slight change in the reflection angle of the light beam, and a slight change in the reflection angle of the light beam will cause a large change in the position of the light spot reflected on the semi-transparent horizontal verification part under the amplification of the reflection distance, so the horizontal posture verification accuracy of the present application is higher.

[0010] Preferably, a regular polygonal pyramid is fixed to the upper end of the floating ball, and multiple side surfaces of the regular polygonal pyramid form the multi-dimensional reflective surface;

[0011] When the horizontal adjustment seat is in a horizontal posture, the light beam emitted by the light emitting element is directed toward the vertex of the regular polygonal pyramid along the direction of the vertical line of the vertex of the regular polygonal pyramid.

[0012] By adopting the above technical solution, firstly, multi-dimensional verification in a horizontal posture is achieved. The more edges the regular polygonal pyramid has, the more horizontal verification dimensions it has, which is more conducive to comprehensively evaluating the horizontality of the horizontal adjustment seat. Secondly, under the premise of satisfying multi-dimensional verification, the structure is greatly simplified, and detection in multiple dimensions is completed by using only one light-emitting component. Thirdly, the detection accuracy is higher, and the regular polygonal pyramid is used to split the light beam, reducing the area of ​​the light spot reflected by the light beam to the semi-transparent horizontal verification part, thereby improving the verification accuracy.

[0013] Preferably, a sealed transparent tank is provided in the center of the level adjustment seat, the cavity is arranged in the sealed transparent tank, the float and the filling liquid are both arranged in the sealed transparent tank, and the light-emitting component is fixed to the top of the sealed transparent tank.

[0014] By adopting the above technical solution, the influence of the volatilization of the filling liquid or the flow of air on the floating posture of the float can be effectively avoided.

[0015] Preferably, the sealed transparent tank is cylindrical, and the inner diameter of the sealed transparent tank is smaller than the distance between the center of the float and the vertex of the regular polygonal pyramid.

[0016] By adopting the above technical solution, the float is prevented from being inverted.

[0017] Preferably, the side wall of the sealed transparent can is coated with a liquid-repellent layer.

[0018] By adopting the above technical solution, it is avoided that the floating height of the float ball is reduced due to the filling liquid adhering to the inner wall of the sealed transparent tank.

[0019] Preferably, both upper and lower sides of the semi-transparent horizontal checking portion are provided with horizontal fine-tuning transparent portions for presenting the offset reflected light beam.

[0020] By adopting the above technical solution, when the horizontal adjustment seat is close to a horizontal posture, the light beam is reflected into the range of the horizontal fine-tuning light-transmitting portion, thereby facilitating guiding and prompting the user to perform the next horizontal adjustment operation.

[0021] Preferably, the counterweight comprises a connecting line with one end fixed to the float, a counterweight block is fixed to the end of the connecting line away from the float, and the connection point between the connecting line and the float and the vertex of the polygonal pyramid are located on the same radial line of the float.

[0022] By adopting the above technical solution, the connecting line is used to accurately apply pulling force to the float to ensure that the float maintains a specific floating posture.

[0023] Preferably, a plurality of telescopic legs are provided around the frame.

[0024] By adopting the above technical solution, the telescopic legs are used to make preliminary posture adjustments to the frame, thereby reducing the adjustment range of the horizontal adjustment seat and improving the adjustment efficiency.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] The present application uses the reflection principle to detect the horizontal posture, and the detection accuracy is higher. A slight change in the posture of the float will cause a slight change in the reflection angle of the light beam. A slight change in the reflection angle of the light beam will cause a large change in the position of the light spot reflected on the semi-transparent horizontal calibration part under the magnification of the reflection distance. Therefore, the present application has a higher accuracy in calibrating the horizontality of the horizontal adjustment seat.

[0027] This application uses the method of observing whether there is a light spot on the semi-transparent level check part to judge whether the required level is met. The judgment method is simple and direct, and effectively avoids the possibility of wrong operation.

[0028] A regular polygonal pyramid is used to divide the light emitted by the light-emitting component into multiple parts and reflect them in multiple directions. Firstly, multi-dimensional verification in a horizontal posture is realized. The more edges the regular polygonal pyramid has, the more horizontal verification dimensions it has, and the horizontality of the horizontal adjustment seat is more comprehensively displayed. Secondly, under the premise of satisfying multi-dimensional verification, the structure is greatly simplified, and detection in multiple dimensions is completed by only one light-emitting component. Thirdly, the detection accuracy is higher, and the regular polygonal pyramid is used to evenly divide the light beam, reducing the light spot area reflected by the light beam to the semi-transparent horizontal verification part, thereby improving the verification accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of a bracket for close-range photography verticality measurement according to an embodiment of the present application.

[0030] Figure 2 It is a cross-sectional view of the horizontal adjustment seat in the embodiment of the present application.

[0031] Explanation of the reference numerals: 1. frame; 2. level adjustment seat; 3. cavity; 4. filling liquid; 5. float; 6. multi-dimensional reflective surface; 7. luminous part; 8. semi-transparent level checking part; 9. regular polygonal pyramid; 10. sealed transparent tank; 11. liquid-repellent layer; 12. level fine-tuning light-transmitting part; 13. connecting line; 14. counterweight; 15. telescopic support foot; 16. hollow interlayer; 17. large gear; 18. small gear; 19. knob; 20. middle ring; 21. positioning groove. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1 and Figure 2 This application is described in further detail.

[0033] The embodiment of the present application discloses a bracket for measuring verticality through close-range photography.

[0034] Reference Figure 1 and Figure 2A bracket for measuring verticality of close-range photography comprises a frame body 1, which is in a ring shape, and four telescopic legs 15 are fixed on the periphery of the frame body 1. The telescopic legs 15 adopt a sliding tube structure, and locking bolts are installed on the side walls of the telescopic legs 15. The length of the telescopic legs 15 is locked and fixed by tightening the bolts; a horizontal adjustment seat 2 for installing a camera is movably arranged on the frame body 1, and the horizontal adjustment seat 2 is in a cylindrical shape. A positioning groove 21 for positioning the camera is opened on the upper surface of the horizontal adjustment seat 2, and a cylindrical sealed transparent tank 10 is fixed along the axial direction of the horizontal adjustment seat 2. A cavity 3 is opened in the sealed transparent tank 10 along the axial direction of the horizontal adjustment seat 2, and a filling liquid 4 is filled in the cavity 3. The filling liquid 4 can be pure water, an electrolyte solution or an organic Solvent, etc., a float 5 is floated on the liquid surface of the filling liquid 4, and the float 5 is a foam sphere or a hollow plastic sphere. A regular polygonal pyramid 9 and a counterweight are fixed to the upper and lower ends of the float 5 respectively, and the regular polygonal pyramid 9 and the counterweight are located on the same radial line of the float 5. Multiple side surfaces of the regular polygonal pyramid 9 are set as mirror surfaces to form a multi-dimensional reflective surface 6, wherein the regular polygonal pyramid 9 can have no limit on the number of edges. This embodiment is explained by taking a regular tetrahedron as an example. A light-emitting component 7 for projecting a light beam onto the reflective surface is installed on the top of the sealed transparent tank 10. The light-emitting component 7 adopts a laser lamp. A hollow interlayer 16 is opened on the side of the sealed transparent tank 10 in the horizontal adjustment seat 2. A semi-transparent horizontal calibration portion 8 is fixed to the edge of the hollow interlayer 16 of the horizontal adjustment seat 2. The semi-transparent horizontal calibration portion 8 is made of translucent plastic, which is convenient for observing the reflection point of the light beam from the outside, wherein the position of the semi-transparent horizontal calibration portion 8 has been horizontally verified and set before the product leaves the factory.

[0035] When in use, the user needs to first change the length of the four telescopic legs 15 according to the terrain, and roughly adjust the frame 1 to a horizontal state, which is beneficial to reduce the adjustment range of the horizontal adjustment seat 2 and improve the efficiency of the horizontal adjustment; then adjust the posture of the horizontal adjustment seat 2 until the user can observe the light spot after the light beam is reflected on the outer wall of the semi-transparent horizontal verification part 8, which means that the horizontal posture adjustment of the horizontal adjustment seat 2 has been in place. Compared with the existing liquid level observation method for judging the horizontality, the present application has the advantages of small observation error, easy use, and intuitive detection feedback.

[0036] In addition, when the horizontal adjustment seat 2 is in a precise horizontal posture, the light beam emitted by the light emitting component 7 is directed toward the vertex of the regular polygonal pyramid 9 along the direction of the perpendicular line of the vertex of the regular polygonal pyramid 9, wherein the cross-section of the light beam emitted by the light emitting component 7 is circular, and the light beam is projected onto the position of the vertex of the regular polygonal pyramid 9, and the center line of the light beam is collinear with the perpendicular line of the vertex of the regular polygonal pyramid 9, so that the top of the regular polygonal pyramid 9 can evenly divide the light beam into multiple parts, which are reflected in multiple directions respectively. The benefits of such a setting are as follows; first, it can realize multi-dimensional verification under horizontal posture. The more edges the regular polygonal pyramid 9 has, the more horizontal verification dimensions it has, and the horizontality of the horizontal adjustment seat 2 can be more comprehensively displayed; second, under the premise of satisfying multi-dimensional verification, the structure is greatly simplified, and multiple-dimensional detection is completed by only one light-emitting component 7; third, the detection accuracy is higher, and the regular polygonal pyramid 9 is used to evenly divide the light beam to reduce the area of ​​the light spot reflected by the light beam to the semi-transparent horizontal verification part 8, thereby improving the verification accuracy. At the same time, the detection accuracy is also improved by detecting the horizontal posture based on the reflection principle, because a slight change in the posture of the regular polygonal pyramid 9 will cause a slight change in the reflection angle of the light beam, and a slight change in the reflection angle of the light beam will cause a large change in the position of the light spot reflected on the semi-transparent horizontal verification part 8 under the enlargement of the radius length of the horizontal adjustment seat 2. Therefore, the horizontal posture verification of the present application has a higher accuracy.

[0037] The inner diameter of the sealed transparent tank 10 is smaller than the distance between the center of the float 5 and the vertex of the regular polygonal pyramid 9 to prevent the regular polygonal pyramid 9 from being inverted. The side wall of the sealed transparent tank 10 is coated with a liquid-repellent layer 11, which prevents the filling liquid 4 from adhering to the inner wall of the sealed transparent tank 10 and causing the height of the regular polygonal pyramid 9 to change, thereby ensuring the detection accuracy. The edge of the hollow interlayer 16 is provided with a horizontal fine-tuning light-transmitting portion 12 for presenting the offset reflected light beam on both the upper and lower sides of the semi-transparent horizontal check portion 8. The horizontal fine-tuning light-transmitting portion 12 is a light yellow translucent plastic. When the horizontal adjustment seat 2 is close to the desired horizontal posture, the light beam is reflected to the horizontal fine-tuning light-transmitting portion 12, presenting the offset state of the horizontal adjustment seat 2, thereby guiding and prompting the user to perform the next horizontal adjustment operation.

[0038] The counterweight comprises a connecting line 13 with one end fixed on the float 5, a counterweight block 14 is fixed on the end of the connecting line 13 away from the float 5, the connection point between the connecting line 13 and the float 5 and the vertex of the polygonal pyramid are located on the same radial line of the float 5. The above scheme increases the force point on which the counterweight block 14 acts on the float 5, ensuring the high-precision vertical posture of the regular polygonal pyramid.

[0039] The horizontal adjustment structure of the horizontal adjustment seat 2 is as follows: a middle ring 20 is rotatably connected in the frame 1, and a horizontal adjustment seat 2 is rotatably connected in the middle ring 20. The rotation axis of the middle ring 20 is perpendicular to the rotation axis of the horizontal adjustment seat 2, and dampers are provided at the rotation connection between the middle ring 20 and the frame 1 and at the rotation connection between the horizontal adjustment seat 2 and the middle ring 20 to improve the stability after rotation adjustment. The frame 1 and the middle ring 20 are both provided with adjustment components of the same structure for adjusting the rotation of the middle ring 20 and the horizontal adjustment seat 2, respectively. The adjustment components include a large gear 17 and a small gear 18 that mesh with each other, and a knob 19 is coaxially fixed on the small gear 18. When in use, the knob 19 is rotated to drive the small gear 18 to rotate, and the small gear 18 then drives the large gear 17 to rotate. The large gear 17 rotates coaxially with the rotation axis of the middle ring 20 or the rotation axis of the horizontal adjustment seat 2 to achieve a more precise horizontal adjustment operation.

[0040] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A bracket for close-range photogrammetry verticality measurement, characterized in that: The invention comprises a frame (1), wherein a horizontal adjustment seat (2) for mounting a camera is movably arranged on the frame (1), a cavity (3) is arranged in the horizontal adjustment seat (2), a filling liquid (4) is arranged in the cavity (3), a floating ball (5) is arranged on the liquid surface of the filling liquid (4), a counterweight is arranged at the lower end of the floating ball (5), a multi-dimensional reflecting surface (6) is arranged at the upper end of the floating ball (5), a light emitting member (7) for projecting a light beam to the multi-dimensional reflecting surface (6) is arranged in the horizontal adjustment seat (2), and a semi-transparent horizontal calibration portion (8) for receiving the light beam emitted by the light emitting member (7) and then reflected by the multi-dimensional reflecting surface (6) is arranged on the peripheral side of the horizontal adjustment seat (2); When the horizontal adjustment seat (2) is in a horizontal position, the light beam emitted by the light emitting element (7) is reflected by the multi-dimensional reflective surface (6) to the semi-transparent horizontal calibration portion (8); A regular polygonal pyramid (9) is fixed to the upper end of the floating ball (5), and multiple side surfaces of the regular polygonal pyramid (9) form the multi-dimensional reflective surface (6); when the horizontal adjustment seat (2) is in a horizontal posture, the light beam emitted by the light emitting element (7) is emitted toward the vertex of the regular polygonal pyramid (9) along the direction of the vertical line of the vertex of the regular polygonal pyramid (9); The upper and lower sides of the semi-transparent horizontal calibration part (8) are both provided with horizontal fine-tuning transparent parts (12) for presenting the offset reflected light beam.

2. The bracket for close-range photogrammetry verticality measurement according to claim 1, characterized in that: A sealed transparent tank (10) is provided at the center of the level adjustment seat (2), the cavity (3) is arranged in the sealed transparent tank (10), the float (5) and the filling liquid (4) are both arranged in the sealed transparent tank (10), and the light-emitting component (7) is fixed to the top of the sealed transparent tank (10).

3. The bracket for close-range photogrammetry verticality measurement according to claim 2, characterized in that: The sealed transparent tank (10) is cylindrical, and the inner diameter of the sealed transparent tank (10) is smaller than the distance between the center of the float (5) and the vertex of the regular polygonal pyramid (9).

4. The bracket for close-range photogrammetry verticality measurement according to claim 2, characterized in that: The side wall of the sealed transparent can (10) is coated with a liquid-repellent layer (11).

5. The bracket for close-range photogrammetry verticality measurement according to claim 1, characterized in that: The counterweight comprises a connecting line (13) with one end fixed to the floating ball (5), a counterweight block (14) is fixed to the end of the connecting line (13) away from the floating ball (5), and the connection point between the connecting line (13) and the floating ball (5) and the vertex of the polygonal pyramid are located on the same radial line of the floating ball (5).

6. The bracket for close-range photogrammetry verticality measurement according to claim 1, characterized in that: A plurality of telescopic legs (15) are arranged around the frame (1).

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