3D TOF camera module calibration device

Abstract

The utility model discloses a 3D TOF camera module calibration device, which is characterized in that the 3D TOF camera module calibration device comprises a box body, a sliding guide rail, a first test calibration plate, a second test calibration plate, a third test calibration plate and a support frame, the first test calibration plate, the second test calibration plate and the third test calibration plate are vertically arranged on a bottom plate of the box body and distributed on three continuous adjacent side faces of the sliding guide rail, a module fixing clamp is arranged at the top end of the supporting frame, the supporting frame is vertically arranged on a sliding block on the sliding guide rail, and the module fixing clamp is arranged on the sliding block. The supporting frame comprises a lifting mechanism and a rotating mechanism, and the rotating angle of the rotating mechanism each time is 90 degrees. The beneficial effects of the utility model are that the calibration of the camera module under various depth conditions can be realized, the calibration efficiency is high, the precision is high, and the operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of camera testing, and in particular to a 3D TOF camera module calibration device. Background Art

[0002] The image information collected by traditional cameras is mostly 2D. With the development of technology and the increase in application needs, there is more demand for obtaining 3D information. For example, in the fields of face recognition, augmented reality (AR), virtual reality (VR), etc., accurate depth information is needed to achieve a more realistic interactive experience, which has prompted the development of TOF camera technology.

[0003] The TOF (Time of Flight) ranging principle is based on continuously sending light pulses to the target, then using a sensor to receive the light returning from the object, and detecting the flight (round-trip) time of the light pulses to obtain the distance to the target object. Its core principle is the constant speed of light, and the formula (speed of light x flight time) / 2 can be used to calculate the precise distance from the sensor to the measured object. For example, when the transmitter emits infrared light and starts timing, the time when the infrared light is reflected from the object and returned to the receiver is recorded, thus measuring the "flight time" of the light. In practice, the TOF sensor is an array that can measure the distance of the entire surface of an object. This principle provides the theoretical basis for TOF camera technology.

[0004] For 3D TOF camera modules, their measurement results and accuracy will be affected by many factors such as the internal and external environment of the camera system. Therefore, in order to obtain more accurate distance information, it is usually necessary to calibrate the depth value of the TOF module. Therefore, a dedicated device is required to test whether the TOF module meets the shipment requirements. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a 3D TOF camera module calibration device, which can realize rapid calibration of the camera module.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A 3D TOF camera module calibration device, characterized by: a box, a sliding guide rail, a first test calibration plate, a second test calibration plate, a third test calibration plate, and a support frame, wherein the sliding guide rail is arranged on the bottom plate of the box, the first test calibration plate, the second test calibration plate, and the third test calibration plate are all erected on the bottom plate of the box and distributed on three consecutive adjacent sides of the sliding guide rail, a module fixing fixture is provided on the top of the support frame, the support frame is vertically arranged on the slider on the sliding guide rail, and the support frame includes a lifting mechanism and a rotating mechanism, and the rotating mechanism rotates 90° each time.

[0008] Furthermore, the sliding guide rail is H-shaped, and the support frame moves horizontally and vertically on the sliding guide rail.

[0009] Furthermore, the support frame includes a shell with a square column structure, the lifting mechanism is an electric push rod, the shell cover is arranged on the electric push rod, and the inner wall of the upper end of the shell is fixedly connected to the upper end of the electric push rod.

[0010] Furthermore, the support frame also includes a base plate, a turntable is provided under the base plate, a rotating shaft is provided on the turntable, the base plate is rotatably arranged on the rotating shaft, a fixed gear is coaxially provided on the rotating shaft, a rotating motor is provided on the base plate, the output shaft of the rotating motor passes through the base plate and is connected to a driving gear, and the driving gear is meshed with the fixed gear.

[0011] Furthermore, the first test calibration board, the second test calibration board, and the third test calibration board are all provided with a chart and a light source board.

[0012] Furthermore, an operation window and a maintenance port are provided on a side of the box body facing the second test calibration plate.

[0013] The beneficial effects of the present invention include: being able to realize the calibration of the camera module under various depth conditions, having high calibration efficiency, and having the advantages of high precision and easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the utility model (the upper part of the box is not shown);

[0015] Figure 2 It is a schematic diagram of the internal structure of the support frame of the present utility model. DETAILED DESCRIPTION

[0016] The present invention will be described in further detail below with reference to specific embodiments and accompanying drawings.

[0017] A kind of Figure 1-2 The 3D TOF camera module calibration device shown in the figure includes a box 1, a sliding guide rail 2, a first test calibration plate 3, a second test calibration plate 4, a third test calibration plate 5, and a support frame 6. The sliding guide rail 2 is set on the bottom plate of the box 1. The first test calibration plate 3, the second test calibration plate 4, and the third test calibration plate 5 are all erected on the bottom plate of the box 1 and distributed on three consecutive adjacent sides of the sliding guide rail 2. The first test calibration plate 3, the second test calibration plate 4, and the third test calibration plate 5 are all set with charts and light source boards.

[0018] A module fixing fixture 7 is provided on the top of the support frame 6. In order to make the distance adjustment more accurate, it is necessary to fine-tune the module fixing fixture 7 when setting up the environment so that the lens end face of the 3D TOF camera module is parallel to the test calibration plate. The support frame 6 is vertically arranged on the slider on the sliding guide rail 2. The sliding guide rail 2 is H-shaped. This structure has the same functional structure as the conventional cross guide slider. The support frame 6 moves horizontally and vertically on the sliding guide rail 2. The device also includes an electric controller module that can control the horizontal and vertical movement of the H-shaped sliding guide rail 2 so that the 3D TOF camera module to be tested can be freely adjusted to the distance and calibration area of ​​the calibration plate, making the calibration process of the 3D TOF camera module more accurate and free. The support frame 6 includes a lifting mechanism and a rotating mechanism. The rotating mechanism rotates 90 degrees each time. The electric controller module can also control the vertical height and rotation direction of the support frame 6 in order to select different calibration charts and calibration areas. Every time a calibration distance is reached, the transmitter of the 3D TOF camera module to be tested will emit infrared light and start timing. When the infrared light is reflected from the object and returned to the receiver, the time is recorded. In this way, the "flight time" of the light is measured and this time is sent to the test computer. By calculating the difference between the measured distance and the actual distance, it is determined whether the performance of the 3D TOF camera module to be tested meets the requirements.

[0019] This embodiment performs calibration tests on different target plates at different distances, so that the 3D TOF camera module to be tested can obtain the infrared light propagation time at different distances and transmit it to the test computer through a transmission line. The test computer then calculates and processes the data, and then compares it with the standard value. Calibration is performed after the difference is obtained.

[0020] like Figure 2 As shown, the support frame 6 of the present invention includes a housing 61 with a square column structure, and the lifting mechanism is an electric push rod 62. The housing 61 is covered on the electric push rod 62, and the inner wall of the upper end of the housing 61 is fixedly connected to the upper end of the electric push rod 62. The support frame 6 also includes a support base 63, a turntable 64 is provided below the support base 63, and a rotating shaft 65 is provided on the turntable 64. The support base 63 is rotatably mounted on the rotating shaft 65, and a fixed gear 66 is coaxially provided on the rotating shaft 65. A rotating motor 67 is provided on the support base 63, and the output shaft of the rotating motor 67 passes through the support base 63 and is connected to a drive gear 68, which meshes with the fixed gear 66.

[0021] For the convenience of operation, an operation window and a maintenance port are provided on the side of the housing 1 facing the second test calibration plate 4 of the present embodiment. When the 3D TOF camera module to be tested is actually calibrated and tested, the support frame 6 on the H-shaped sliding rail 2 is first moved to the loading and unloading window, and the operator manually places the 3D TOF camera module to be tested into the module fixing fixture 7 with the light hole 12 and fixes it so that the module is in a horizontal position for calibration testing. Then, the computer is operated to control the rotation direction of the support frame 6 according to the needs to select different test target plates, and the H-shaped sliding guide rail 2 is controlled to move the support frame 6 to different positions to calibrate the test target plates. The images of different test target plates at different distances obtained are sent to the test computer for calculation processing. According to the processed results and the test specifications, it is judged whether the performance parameters of the 3D TOF camera module to be tested meet the relevant requirements and the final judgment results are displayed. Finally, the operator removes the module for classification according to the test results.

[0022] The above is a detailed introduction to the technical solutions provided by the embodiments of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A 3D TOF camera module calibration device, characterized by: A box body (1), a sliding guide rail (2), a first test calibration plate (3), a second test calibration plate (4), a third test calibration plate (5), and a support frame (6), wherein the sliding guide rail (2) is arranged on the bottom plate of the box body (1), the first test calibration plate (3), the second test calibration plate (4), and the third test calibration plate (5) are all erected on the bottom plate of the box body (1) and distributed on three consecutive adjacent sides of the sliding guide rail (2), a module fixing fixture (7) is arranged on the top of the support frame (6), the support frame (6) is vertically arranged on the slider on the sliding guide rail (2), and the support frame (6) includes a lifting mechanism and a rotating mechanism, and the rotating mechanism rotates at an angle of 90° each time.

2. A 3D TOF camera module calibration device according to claim 1, characterized in that: The sliding guide rail (2) is H-shaped, and the support frame (6) moves horizontally and vertically on the sliding guide rail (2).

3. The 3D TOF camera module calibration device according to claim 1, wherein: The support frame (6) comprises a shell (61) of a square column structure, the lifting mechanism is an electric push rod (62), the shell (61) is covered on the electric push rod (62), and the inner wall of the upper end of the shell (61) is fixedly connected to the upper end of the electric push rod (62).

4. The 3D TOF camera module calibration device according to claim 3, wherein: The support frame (6) further comprises a support base plate (63), a turntable (64) is provided below the support base plate (63), a rotating shaft (65) is provided on the turntable (64), the support base plate (63) is rotatably arranged on the rotating shaft (65), a fixed gear (66) is coaxially provided on the rotating shaft (65), a rotating motor (67) is provided on the support base plate (63), an output shaft of the rotating motor (67) passes through the support base plate (63) and is connected to a driving gear (68), and the driving gear (68) is meshed with the fixed gear (66).

5. The 3D TOF camera module calibration device according to claim 1, wherein: The first test calibration plate (3), the second test calibration plate (4), and the third test calibration plate (5) are all provided with a chart and a light source plate.

6. The 3D TOF camera module calibration device according to claim 1, wherein: The box body (1) has an operation window and a maintenance port on the side facing the second test calibration plate (4).

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