Portable high-precision distance measuring device

Abstract

The utility model discloses a portable high-precision distance measuring device, which comprises two camera modules, a shell, a binocular adjusting unit and a driving unit, and is characterized in that the shell is a frame penetrating along a first direction, one end of the shell is provided with a notch penetrating along a second direction, and the second direction is perpendicular to the first direction; the binocular adjusting unit is arranged in the notch and comprises a two-way movement mechanism and two symmetrically-arranged rotating adjusting units, and the two-way movement mechanism is driven by the driving unit to drive the two rotating adjusting units to move in the opposite direction or the reverse direction in the second direction; the rotation adjusting units are connected with the camera modules in a one-to-one correspondence mode and used for achieving rotation of the corresponding camera modules around a third direction, and the third direction is perpendicular to the first direction and the second direction. The device realizes accurate multi-degree-of-freedom adjustment of the position between the two camera modules, is convenient to move and use in the distance measurement and calibration process, and is high in compatibility and convenient to maintain.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical measurement, and particularly relates to a portable high-precision ranging device. Background Art

[0002] In the applications of image measurement, positioning, and machine vision, in order to determine the mutual relationship between the geometric position of a certain point on the surface of a spatial object in three-dimensional space and the corresponding point in a two-dimensional image, it is necessary to establish a geometric model of camera imaging. Among them, the geometric model parameters are the parameters of the camera, and the process of solving the parameters is the so-called camera calibration.

[0003] Existing camera calibration usually uses a checkerboard for calibration. As an important reference benchmark, there are relatively high precision requirements for the checkerboard calibration board. However, after the production of the existing checkerboard calibration board, the current evaluation of its quality is mainly through direct human eye observation and measurement with a vernier caliper or a straight ruler. However, manual observation or measurement often has problems such as inaccurate positioning, low measurement accuracy, and cannot meet the requirements of on-site rapid ranging. Summary of the Utility Model

[0004] The purpose of the utility model is to propose a portable high-precision ranging device for the above problems, which realizes precise multi-degree-of-freedom adjustment of the positions between two camera modules, is convenient for mobile use during the ranging and calibration processes, helps to improve the ranging accuracy, has strong compatibility, and is easy to maintain.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A portable high-precision ranging device proposed by the utility model includes two camera modules, and also includes a housing, a binocular adjustment unit, and a driving unit, wherein:

[0007] The housing is a frame body penetrating along a first direction, and a notch penetrating along a second direction is opened at one end, and the second direction is perpendicular to the first direction;

[0008] The binocular adjustment unit is built in the notch and includes a bidirectional movement mechanism and two symmetrically arranged rotation adjustment units. The bidirectional movement mechanism is driven by the driving unit to drive the two rotation adjustment units to move towards each other or in opposite directions along the second direction. The rotation adjustment unit is connected to the camera module in a one-to-one correspondence and is used to realize the rotation of the corresponding camera module around a third direction, and the third direction is perpendicular to the first direction and the second direction.

[0009] Preferably, the bidirectional movement mechanism is a bidirectional ball screw slide table.

[0010] Preferably, the rotation adjustment unit includes a first screw, a second screw, and a camera adapter plate. The camera adapter plate is provided with a first through hole and an arc-shaped groove. The camera adapter plates correspond to the ball nuts on the bidirectional ball screw slide table one by one, and are connected to the corresponding ball nuts by passing the second screw through the first through hole and passing the first screw through the arc-shaped groove.

[0011] Preferably, a first scale is further provided on the camera adapter plate corresponding to the arc-shaped groove.

[0012] Preferably, the driving unit includes a handwheel coaxially connected to the lead screw of the bidirectional ball screw slide table, and the handwheel is further provided with a handheld part parallel to the axis.

[0013] Preferably, the driving unit further includes a locking block and a locking wrench. The locking block is sleeved on the lead screw of the bidirectional ball screw slide table and fixedly connected to the bidirectional ball screw slide table. The lead screw of the bidirectional ball screw slide table is clamped by adjusting the locking wrench to achieve locking and limiting.

[0014] Preferably, a second scale is further provided on the handwheel.

[0015] Preferably, the camera module includes a camera and a lens connected to each other, and the camera is detachably connected to the rotation adjustment unit.

[0016] Preferably, the housing is provided with a handle and at least one hollow hole for easy hand support.

[0017] Preferably, the frame is a square frame.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] The device uses a bidirectional motion mechanism to drive the camera module. For example, a bidirectional ball screw slider is used to convert rotational motion into bidirectional linear motion, achieving precise adjustment of the position center between the two camera modules. The camera adapter plate is used to both fix the camera and adjust the horizontal angle of the camera. The multi-degree-of-freedom design is more in line with the simulation of the human eye, enabling it to not only meet the requirements of portable high-precision ranging for the camera, but also have more usage possibilities (such as simulating the eyes of humans or other animals). After the device is calibrated, it can be directly used to measure the precision of objects. For example, high-precision measurement of objects such as a checkerboard calibration plate can be achieved through binocular cameras. Calibrating the device involves adjusting the imaging points of the two cameras to correspond to the points on the checkerboard calibration plate and establishing an accurate geometric model for calibration. The device is applicable to distance detection of various models of checkerboard calibration plates to determine their precision, and is also compatible with calibration using various models of checkerboard calibration plates. It has the characteristics of simple structure, being lightweight and compact, easy to hold, convenient to adjust, and accurate in positioning, facilitating mobile use during ranging and calibration, and having strong compatibility, which is conducive to disassembly, replacement, and maintenance. Different cameras, lenses, etc. can be replaced at any time. Through the adjustment of the handwheel and the locking mechanism composed of a locking block and a locking wrench, accurate positioning of the camera module is achieved after adjustment, avoiding possible movement of the camera module during use and ensuring the measurement precision. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the portable high-precision ranging device of the present utility model;

[0021] Figure 2 is an exploded view of the portable high-precision ranging device of the present utility model;

[0022] Figure 3 is a front view of the portable high-precision ranging device of the present utility model;

[0023] Figure 4 is a left view of the portable high-precision ranging device of the present utility model;

[0024] Figure 5 is a schematic assembled structural diagram of the binocular adjustment unit and the drive unit of the present utility model;

[0025] Figure 6 is a schematic structural diagram of the drive unit of the present utility model.

[0026] Description of the Reference Numerals: 1, housing; 2, binocular adjustment unit; 3, camera module; 4, drive unit; 11, notch; 12, handle; 13, hollow hole; 21, bidirectional motion mechanism; 22, first screw; 23, second screw; 24, camera adapter plate; 241, arc-shaped groove; 41, handwheel; 42, locking block; 43, locking wrench; 44, handheld part. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] It should be noted that when a component is referred to as being "connected" to another component, it may be directly connected to the other component or there may be an intermediate component. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of this application. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0029] like Figure 1-6 As shown, a portable high-precision distance measuring device includes two camera modules 3, a housing 1, a binocular adjustment unit 2 and a drive unit 4, wherein:

[0030] The housing 1 is a frame that penetrates along a first direction, and has a notch 11 that penetrates along a second direction at one end, the second direction being perpendicular to the first direction;

[0031] The binocular adjustment unit 2 is built into the slot 11, and includes a bidirectional motion mechanism 21 and two symmetrically arranged rotation adjustment units. The bidirectional motion mechanism 21 is driven by the driving unit 4 to drive the two rotation adjustment units to move toward or in the opposite direction along the second direction. The rotation adjustment unit is connected to the camera module 3 one by one and is used to realize the rotation of the corresponding camera module 3 around a third direction, and the third direction is perpendicular to the first direction and the second direction.

[0032] For ease of understanding, Figure 1 As shown, the reference directions of this embodiment are defined as follows: the first direction is the front-to-back direction (Y direction), the second direction is the left-to-right direction (X direction), and the third direction is the up-down direction (Z direction). It is easy to understand that the specific directions are not limited and can be adjusted according to actual needs.

[0033] The device adopts a bidirectional motion mechanism to drive the camera module, and realizes the precise adjustment of the center position between the two camera modules; and the camera adapter plate has the functions of fixing the camera module and adjusting the horizontal angle of the camera module. The multi-degree-of-freedom design is more in line with the simulation of the human eye, so that it can not only meet the portable high-precision ranging function of the camera, but also has more possibilities of use. It is suitable for a variety of chessboard calibration plate models, with the characteristics of simple structure, light and compact, easy to hold, easy to adjust, accurate positioning, convenient for mobile use during ranging and calibration, and strong compatibility. By opening a slot running through along the second direction at one end of the shell (such as the first direction of penetration is the two ends of the shell), it is convenient for disassembly, replacement and maintenance, and different camera modules can be replaced at any time, such as cameras, lenses, etc.

[0034] In one embodiment, the bidirectional motion mechanism 21 is a bidirectional ball screw slide. Preferably, the bidirectional ball screw slide converts the rotary motion into bidirectional linear motion, which has high positioning accuracy. Alternatively, it can be replaced by other bidirectional motion mechanisms in the prior art.

[0035] In one embodiment, the rotation adjustment unit includes a first screw 22, a second screw 23 and a camera adapter plate 24, a first through hole and an arc groove 241 are provided on the camera adapter plate 24, the camera adapter plate 24 corresponds to the ball nut on the bidirectional ball screw slide, and the first through hole is penetrated by the second screw 23 and the arc groove 241 is penetrated by the first screw 22 to connect with the corresponding ball nut. The rotation adjustment unit is connected with the corresponding ball nut through the cooperation of the first screw 22, the second screw 23 and the camera adapter plate 24 (adaptable, such as fixed by a slider connected to the ball nut through a bearing), and can realize horizontal rotation adjustment, with a simple structure, which is conducive to small and light weight, and thus easy to hold.

[0036] In one embodiment, the camera adapter plate 24 is further provided with a first scale ruler corresponding to the arc groove 241, so as to facilitate accurate adjustment and positioning.

[0037] In one embodiment, the drive unit 4 includes a hand wheel 41 coaxially connected to the screw rod of the bidirectional ball screw slide, and the hand wheel 41 is also provided with a hand grip 44 parallel to the axis. The hand grip 44 on the hand wheel 41 is adjusted to facilitate operation by the operator.

[0038] In one embodiment, the driving unit 4 further includes a locking block 42 and a locking wrench 43. The locking block 42 is sleeved on the lead screw of the bidirectional ball screw stage and fixedly connected to the bidirectional ball screw stage. By adjusting the locking wrench 43, the locking block 42 clamps the lead screw of the bidirectional ball screw stage to achieve locking and limiting. Through the locking mechanism composed of the locking block 42 and the locking wrench 43, the camera module is accurately limited after adjustment, avoiding the possible movement of the camera module during use and ensuring the measurement accuracy.

[0039] In one embodiment, a second scale is further provided on the handwheel 41, which is convenient for accurate adjustment and positioning.

[0040] In one embodiment, the camera module 3 includes a camera and a lens connected to each other, and the camera is detachably connected to the rotation adjustment unit. The detachable connection is convenient for replacement and maintenance, such as by detaching screw connection or using a quick-release mechanism in the prior art.

[0041] In one embodiment, a handle 12 and at least one hollow hole 13 for easy hand support are provided on the housing 1. The handle 12 is arranged above the housing 1, and the hollow holes 13 are opened on the left and right sides of the housing 1. Through the cooperation of the handle 12 and the hollow holes 13, it is convenient to hold stably and helps to save effort at the same time.

[0042] In one embodiment, the frame is a square frame. The specific shape of the frame can be adjusted according to actual needs.

[0043] Working principle:

[0044] During use, first loosen the first screw 22 and the second screw 23, so that the camera module 3 on the corresponding camera adapter plate 24 rotates around the first through hole, and through the limitation of the arc-shaped groove 241, it is adjusted to the appropriate scale position to achieve precise adjustment of the camera module 3 in the horizontal position and adjust the angle of the camera module 3 in the horizontal direction. Then tighten the first screw 22 and the second screw 23 to fix the camera adapter plate 24, thereby realizing the fixation of the camera module 3; loosen the locking block 42 by adjusting the locking wrench 43, rotate the handwheel 41 to adjust the bidirectional movement mechanism, thereby driving the camera module to achieve precise adjustment of the position in the middle between the two camera modules 3. After quickly obtaining the optimal working distance, then adjust the locking wrench 43 to clamp the locking block 42, thereby clamping the lead screw of the bidirectional ball screw stage to achieve locking and limiting, and it can be used for actual ranging and calibration scenarios. When adjusting the use requirements in different scenarios, simply adjusting the distance and horizontal angle between the two camera modules 3 can quickly adapt.

[0045] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0046] The above-described embodiments only represent relatively specific and detailed embodiments of the present application, but should not be construed as limiting the scope of the patented application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A portable high-precision ranging device, comprising two camera modules (3), characterized in that: The portable high-precision distance measuring device further comprises a housing (1), a binocular adjustment unit (2) and a drive unit (4), wherein: The housing (1) is a frame that penetrates along a first direction, and one end of the frame is provided with a notch (11) that penetrates along a second direction, wherein the second direction is perpendicular to the first direction; The binocular adjustment unit (2) is built into the slot (11), and comprises a bidirectional motion mechanism (21) and two symmetrically arranged rotation adjustment units, wherein the bidirectional motion mechanism (21) is driven by the drive unit (4) to drive the two rotation adjustment units to move toward or in opposite directions along a second direction, and the rotation adjustment units are connected to the camera modules (3) in a one-to-one correspondence and are used to realize the rotation of the corresponding camera modules (3) around a third direction, wherein the third direction is perpendicular to the first direction and the second direction.

2. The portable high-precision ranging device according to claim 1, wherein: The bidirectional motion mechanism (21) is a bidirectional ball screw slide.

3. The portable high-precision ranging device according to claim 2, characterized in that: The rotation adjustment unit comprises a first screw (22), a second screw (23) and a camera adapter plate (24); the camera adapter plate (24) is provided with a first through hole and an arc groove (241); the camera adapter plate (24) corresponds one-to-one with the ball nut on the bidirectional ball screw slide; the first through hole is penetrated by the second screw (23) and the arc groove (241) is penetrated by the first screw (22) to be connected with the corresponding ball nut.

4. The portable high-precision ranging device according to claim 3, wherein: The camera adapter plate (24) is also provided with a first scale ruler corresponding to the arc-shaped groove (241).

5. The portable high-precision ranging device according to claim 2, wherein: The driving unit (4) comprises a hand wheel (41) coaxially connected to the screw rod of the bidirectional ball screw slide, and the hand wheel (41) is also provided with a hand holding portion (44) parallel to the axis.

6. The portable high-precision ranging device according to claim 5, wherein: The drive unit (4) further comprises a locking block (42) and a locking wrench (43); the locking block (42) is inserted into the screw rod of the bidirectional ball screw slide and is fixedly connected to the bidirectional ball screw slide; the locking block (42) is clamped on the screw rod of the bidirectional ball screw slide to achieve locking and limiting by adjusting the locking wrench (43).

7. The portable high-precision ranging device according to claim 5, characterized in that: The hand wheel (41) is also provided with a second scale.

8. The portable high-precision ranging device according to claim 1, wherein: The camera module (3) comprises a camera and a lens which are connected to each other, and the camera is detachably connected to a rotation adjustment unit.

9. The portable high-precision ranging device according to claim 1, wherein: The housing (1) is provided with a handle (12) and at least one hollow hole (13) for convenient handholding.

10. The portable high-precision distance measurement device according to claim 1, wherein: The frame is a square frame.

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