A bracket for fixing a binocular camera

Abstract

The invention discloses a bracket for fixing a binocular camera, comprising a base plate, a binocular connecting rod, a fixing ring, a guide rail slider, a deformation module and a push rod; one end of the binocular connecting rod is fixed on the base plate, and the other end is connected to the base plate through the guide rail slider, and the binocular connecting rod can move along the guide rail of the guide rail slider when axial force occurs; the fixing ring is sleeved on the binocular connecting rod, and the bottom is fixed, and is used to limit its radial displacement and / or deflection; one end of the push rod is fixed, and the other end passes through a fixing ring I fixed at the bottom; the deformation module is connected between the binocular connecting rod and the push rod, and the thickness of the middle part is the smallest, and is used to offset the deformation of the push rod caused by the deformation of the base plate, and the torque when the push rod and the binocular connecting rod are not coaxial; the thermal expansion coefficients of the binocular connecting rod, the push rod and the base plate are σ1, σ2, and σ3 respectively, which meet the following conditions: σ1+(10%-25%)σ2>(1.2-1.25)σ3. The bracket can effectively reduce the impact of ambient temperature on binocular testing accuracy. Other equipment can also be installed according to test requirements, which can broaden the application scenarios of the product.

Description

Technical Field

[0001] The invention relates to the field of visual detection, and in particular to a bracket for fixing a binocular camera. Background Art

[0002] Binocular vision is a method of passively perceiving distance using computers by simulating the principle of human vision. An object is observed from two or more points, images from different perspectives are obtained, and the offset between pixels is calculated based on the matching relationship between the pixels in the images and the principle of triangulation to obtain the three-dimensional information of the object.

[0003] The accuracy of binocular vision measurement depends on the stability of all structures in the binocular measurement system after calibration. Binocular camera calibration not only needs to obtain the internal parameters of each camera, but also needs to calibrate the relative position between two or more cameras. The accuracy of binocular vision measurement is mainly affected by the relative position between the binoculars in the system and the temperature difference between the binocular measurement and calibration. The relative position between the binoculars includes the baseline distance between the binoculars and the relative angle between the binoculars.

[0004] When measuring at a long distance, a slight change in the structure of binocular vision can cause a large measurement error. The change in the structure will infinitely magnify the measurement error. When the visual inspection equipment is used in the field of rail transit, the contact network is 5-7m away from the track surface, the binocular distance is 1-2 meters, and the test process is outdoors. After the binocular vision system is calibrated, the change in structure will be mainly affected by temperature changes, causing changes in the binocular baseline distance and relative angle. Due to the height of the contact network and its pull-out, the angle between the binocular cameras is small (about 15°), and a slight change in the structure will lead to inaccurate measurement. The existing binocular measurement system is mainly aimed at close-range measurement. The distance between the two cameras used is small, generally within 40cm or 40cm, and the use environment is mostly indoors, and the ambient temperature has little effect on it. However, for long-distance measurement applied to outdoor, the accuracy will be significantly affected by environmental factors, and the existing binocular installation structure cannot achieve high-precision measurement. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a bracket for fixing a binocular camera, which can effectively reduce the impact of ambient temperature on the binocular test accuracy. Other equipment can also be installed according to test requirements, which can broaden the application scenarios of the product.

[0006] To this end, the technical solution of the present invention is as follows:

[0007] A bracket for fixing a binocular camera, comprising a base plate, a binocular connecting rod, a fixing ring, a guide rail slider, a deformation module and a top rod;

[0008] The length of the top rod is 10-35% of the length of the binocular connecting rod;

[0009] Both ends of the binocular connecting rod are provided with mounting positions for mounting binocular cameras, one end of which is fixedly arranged on the bottom plate, and the other end is connected to the bottom plate through a guide rail slider, and the binocular connecting rod can move along the guide rail of the guide rail slider when axial force occurs;

[0010] The fixing ring is sleeved on the binocular connecting rod, and the bottom side of the fixing ring is fixedly connected to the bottom plate, so as to limit the radial displacement and / or deflection of the binocular connecting rod;

[0011] One end of the push rod is fixed to the bottom plate, and the other end passes through a fixing ring I fixed to the bottom plate;

[0012] One side of the deformation module is connected to the end surface of the binocular connecting rod on which the guide rail slider is installed, and the other side is installed on the end surface of the unfixed end of the ejector rod;

[0013] The middle part of the deformation module has the smallest thickness, which is used to offset the deformation of the top rod caused by the deformation of the bottom plate due to temperature, and the torque when the top rod and the binocular connecting rod are not coaxial;

[0014] The thermal expansion coefficients of the binocular connecting rod, the top rod and the bottom plate are σ1, σ2 and σ3 respectively, which meet the following conditions: σ1+(10%-25%)σ2>(1.2-1.25)σ3.

[0015] Furthermore, the deformation module is symmetrical in the plane where the central axis is located, and the left and right end surfaces are respectively connected to the binocular connecting rod and the end surface of the top rod. The thickness of the deformation module gradually decreases from the left and right end surfaces to the middle surface between the two.

[0016] Furthermore, there are multiple fixing rings 3 which are evenly distributed.

[0017] Furthermore, the thickness of the deformation module gradually decreases from the left and right end surfaces to the middle surface between the two, and the cross-section is semicircular, V-shaped, cycloid, parabolic or semi-elliptical.

[0018] Furthermore, the binocular connecting rod is a carbon fiber rod or an Invar rod.

[0019] Furthermore, the bottom plate is a cast iron plate, a stainless steel plate or an aluminum alloy plate.

[0020] Furthermore, the deformation module is made of titanium alloy, copper-nickel alloy or magnesium alloy.

[0021] Furthermore, the length of the deformation module is 5% to 20% of the length of the push rod.

[0022] Furthermore, the guide rail slider is divided into two parts: a guide rail and a slider, the guide rail is fixed on the bottom plate, and the slider is fixed on the deformation module. Furthermore, the cross section of the guide rail is I-shaped.

[0023] The present invention provides a bracket for fixing a binocular camera, which can effectively reduce the influence of ambient temperature on binocular test accuracy, and can also install other equipment according to test requirements, thereby broadening the application scenarios of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of a bracket for fixing a binocular camera provided by the present invention;

[0025] Figure 2a for Figure 1 Schematic diagram of the structure of the middle deformation module, with a semicircular cross section;

[0026] Figure 2b for Figure 2a The first alternative structure of the middle deformation module has a V-shaped cross section;

[0027] Figure 2c for Figure 2a The second alternative structure of the middle deformation module has a cycloid cross section;

[0028] Figure 2d for Figure 2a The third alternative structure of the middle deformation module has a parabolic cross section;

[0029] Figure 2e for Figure 2a The fourth alternative structure of the middle deformation module has an elliptical cross section;

[0030] Figure 3 A structural schematic diagram of a guide rail slider. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] like Figure 1 As shown, a bracket for fixing a binocular camera includes a base plate 1, a binocular connecting rod 2, a fixing ring 3, a guide rail slider 4, a deformation module 5 and a top rod 6;

[0033] The length of the top rod 6 is 10-35% of the length of the binocular connecting rod 2;

[0034] Both ends of the binocular connecting rod 2 are provided with mounting positions for installing the binocular camera 201, one end of which is fixedly set on the base plate 1, and the other end is connected to the base plate 1 through the guide rail slider 4. When the binocular connecting rod 2 undergoes axial deformation, it can move along the guide rail 401 of the guide rail slider 4; specifically, the guide rail slider 4 is divided into two parts, the guide rail 401 and the slider 402, the guide rail 401 is fixed on the base plate 1, and the slider 402 is fixed on the deformation module 5. Figure 3A specific implementation of the present invention is given, the cross section of the guide rail 401 is I-shaped, and those skilled in the art can arbitrarily select a guide rail slider of different shapes on the basis of ensuring that the binocular connecting rod 2 is restricted from radial deformation or deflection;

[0035] The fixing ring 3 is sleeved on the binocular connecting rod 2, and its bottom side is fixedly connected to the bottom plate 1, and is used to limit the radial displacement and / or deflection of the binocular connecting rod 2; there are multiple fixing rings 3, which are evenly distributed along the axial direction of the binocular connecting rod 2. Figure 1 , which are distributed in 3, and the number setting can be set by those skilled in the art according to the length of the binocular connecting rod 2;

[0036] One end of the top rod 6 is fixed on the bottom plate 1, and the other end passes through a fixing ring I601 fixed on the bottom plate 1;

[0037] One side of the deformation module 5 is connected to the end surface of the binocular connecting rod 2 on which the guide slider 4 is installed, and the other side is installed on the end surface of the unfixed end of the top rod 6; specifically, the deformation module 5 is symmetrical up and down with respect to the plane where the central axis is located, and the left and right end surfaces are respectively connected to the end surfaces of the binocular connecting rod 2 and the top rod 6, and the thickness of the deformation module 5 gradually decreases from the left and right end surfaces to the position of the middle surface between the two, and its cross section is: semicircular, V-shaped, cycloid, parabolic or semi-elliptical;

[0038] The length of the deformation module 5 is 5% to 20% of the length of the top rod, and its purpose is to offset the influence of the deformation of the bottom plate and the top rod on the binocular connecting rod to ensure the final test accuracy. Those skilled in the art can obtain the final length value after a limited number of experiments based on the disclosure of this application;

[0039] The thickness of the middle part of the deformation module 5 is the smallest, and is used to offset the deformation of the top rod 6 caused by the deformation of the bottom plate 1 due to temperature, and the torque when the top rod 6 and the binocular connecting rod 2 are not coaxial;

[0040] The thermal expansion coefficients of the binocular connecting rod 2, the top rod 6 and the bottom plate 1 are σ1, σ2 and σ3 respectively, which satisfy the following condition: σ1+(10%-25%)σ2>(1.2-1.25)σ3.

[0041] In order to ensure the accuracy of the final test results, the binocular connecting rod 2 is a carbon fiber rod or an Invar rod; the base plate 1 is a cast iron plate, a stainless steel plate or an aluminum alloy plate; the deformation module 5 is made of titanium alloy, copper-nickel alloy or magnesium alloy.

[0042] The bracket can effectively reduce the impact of ambient temperature on binocular test accuracy. Other equipment can also be installed according to test requirements, which can broaden the application scenarios of the product and meet the requirements of rail transit test contact network parameters.

[0043] The foregoing description of the specific exemplary embodiments of the present invention is presented for the purpose of illustration and description. The foregoing description is not intended to be exhaustive, nor is it intended to limit the present invention to the precise form disclosed, and it is apparent that many changes and variations are possible in light of the above teachings. The exemplary embodiments are selected and described to explain the specific principles of the present invention and its practical application, so that other technicians in the field can realize and utilize the various exemplary embodiments of the present invention and its different selected forms and modified forms. The scope of the present invention is intended to be limited by the appended claims and their equivalents.

Claims

1. A bracket for fixing a binocular camera, characterized in that: It comprises a base plate (1), a binocular connecting rod (2), a fixing ring (3), a guide rail slider (4), a deformation module (5) and a top rod (6); The length of the top rod (6) is 10 to 35% of the length of the binocular connecting rod (2); Both ends of the binocular connecting rod (2) are provided with mounting positions for mounting a binocular camera (201), one end of which is fixedly arranged on the base plate (1), and the other end is connected to the base plate (1) via a guide rail slider (4), and the binocular connecting rod (2) can move along the guide rail (401) of the guide rail slider (4) when an axial force is applied to it; The fixing ring (3) is sleeved on the binocular connecting rod (2), and its bottom side is fixedly connected to the bottom plate (1), so as to limit the radial displacement and / or deflection of the binocular connecting rod (2); One end of the top rod (6) is fixed on the bottom plate (1), and the other end passes through a fixing ring I (601) fixed on the bottom plate (1); One side of the deformation module (5) is connected to the end surface of the binocular connecting rod (2) on which the guide rail slider (4) is installed, and the other side is installed on the end surface of the unfixed end of the push rod (6); The deformation module (5) has the smallest thickness in the middle, and is used to offset the deformation of the top rod (6) caused by the deformation of the bottom plate due to temperature, and the torque when the top rod (6) and the binocular connecting rod (2) are not coaxial; The thermal expansion coefficients of the binocular connecting rod (2), the top rod (6) and the bottom plate (1) are σ1, σ2 and σ3 respectively, which satisfy the following condition: σ1+(10%-25%)σ2>(1.2-1.25)σ3.

2. The bracket for fixing a binocular camera as claimed in claim 1, characterized in that: The deformation module (5) is symmetrical in the plane where the central axis is located, and the left and right end surfaces are respectively connected to the end surfaces of the binocular connecting rod (2) and the top rod (6). The thickness of the deformation module (5) gradually decreases from the left and right end surfaces to the middle surface between the two.

3. The bracket for fixing a binocular camera as claimed in claim 2, characterized in that: The thickness of the deformation module (5) gradually decreases from the left and right end surfaces to the middle surface between the two ends, and the cross-section presented is: semicircular, V-shaped, cycloid, parabolic or semi-elliptical.

4. The bracket for fixing a binocular camera as claimed in claim 1, characterized in that: There are multiple fixing rings (3) which are evenly distributed.

5. The bracket for fixing a binocular camera as claimed in claim 1, characterized in that: The binocular connecting rod (2) is a carbon fiber rod or an Invar rod.

6. The bracket for fixing a binocular camera as claimed in claim 1, characterized in that: The bottom plate (1) is a cast iron plate, a stainless steel plate or an aluminum alloy plate.

7. The bracket for fixing a binocular camera as claimed in claim 1, characterized in that: The deformation module (5) is made of titanium alloy, copper-nickel alloy or magnesium alloy material.

8. The bracket for fixing a binocular camera as claimed in claim 1, characterized in that: The length of the deformation module (5) is 5% to 20% of the length of the push rod (6).

9. The bracket for fixing a binocular camera as claimed in claim 1, characterized in that: The guide rail slider (4) is divided into two parts: a guide rail (401) and a slider (402); the guide rail (401) is fixed on the bottom plate (1), and the slider (402) is fixed on the deformation module (5).

10. The bracket for fixing a binocular camera as claimed in claim 9, characterized in that: The guide rail (401) has an I-shaped cross section.

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