Correcting jig of distance measuring camera module

Abstract

The utility model discloses a correction jig of a ranging camera module. The correction jig comprises a shell, an obstacle simulation block and a camera module. The test cavity comprises a first end part and a second end part, the first end part is provided with a camera module, and the obstacle simulation block is movably arranged on the shell between the first end part and the second end part. The camera module photographs the obstacle simulation block, software matched with the correction jig analyzes pictures photographed by the camera module, and the software calculates the distance between the camera module and the obstacle simulation block. A scale groove is formed in the shell in the axial direction, scale strips used for measuring the distance are arranged on the two sides of the scale groove, a tester reads the distance between the camera module and the obstacle simulation block from the scale strips, and then the distance data simulated through software are compared with the directly-read distance data. And the software program in the camera module is adjusted according to the data deviation between the two, so that the distance measurement precision of the camera module is improved, and the use experience of a user is enhanced.

Description

Technical Field

[0001] The utility model relates to the field of jigs, in particular to a calibration jig for a ranging camera module. Background Art

[0002] With the popularization of intelligent products, unmanned driving and reversing images of cars all require measuring the distance to obstacles. The distance is usually measured by taking photos with a camera module, and the software then calculates the distance to the obstacle based on the photos. Before leaving the factory, the camera module needs to be tested and calibrated for accuracy. In the existing technology, the existing test accuracy of the camera module is relatively weak, which may cause system misjudgment during user use, resulting in car accidents or property losses. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a calibration fixture for a ranging camera module.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A calibration jig for a ranging camera module comprises: a shell, an obstacle simulation block and a camera module; the shell is hollow inside and is provided with a ranging cavity inside; the test cavity comprises a first end and a second end; the camera module is provided with the first end; the obstacle simulation block is movably arranged on the shell between the first end and the second end; the shooting direction of the camera module is toward the obstacle simulation block; a scale groove is opened on the side surface of the shell in the axial direction; scale bars for measuring distance are arranged on both sides of the scale groove.

[0006] In one embodiment, the obstacle simulation block is provided with a protrusion at the position where it cooperates with the scale groove, and the protrusion is movably abutted in the scale groove.

[0007] In one embodiment, a triangular character is provided on the protrusion, and one corner of the triangular character points vertically to the scale bar.

[0008] In one embodiment, an adjustment slot is formed on a side surface of the shell in an axial direction, and an adjustment handle is provided on the obstacle simulation block, and the adjustment handle extends into the adjustment slot.

[0009] In one embodiment, a sliding groove is provided in the ranging cavity, and the obstacle simulation block is movably disposed in the sliding groove.

[0010] In one embodiment, the obstacle simulation block is provided with fluorescent characters at the shooting end of the camera module.

[0011] In one of the embodiments, a camera module installation cavity is formed at the first end, the camera module installation cavity is communicated with the ranging cavity, and the camera module is arranged on the camera module installation cavity.

[0012] In one embodiment, the shell is cylindrical.

[0013] In one embodiment, the shell includes a top shell, a middle shell and a bottom shell, the top shell is arranged at one end of the middle shell, and the bottom shell is arranged at the other end of the middle shell.

[0014] In one embodiment, the top shell and the bottom shell are respectively screwed to the middle shell.

[0015] Compared with the prior art, the utility model has at least the following advantages:

[0016] The calibration fixture of the distance measuring camera module of the utility model is provided by setting a shell, an obstacle simulation block and a camera module. A distance measuring cavity is provided inside the shell, and the test cavity includes a first end and a second end opposite to each other, and a camera module is provided at the first end, and the obstacle simulation block is movably provided on the shell between the first end and the second end. The camera module takes pictures of the obstacle simulation block, and the software matched with the calibration fixture analyzes and processes the pictures taken by the camera module, and the software calculates the distance between the camera module and the obstacle simulation block. The side of the shell is provided with a scale groove in the axial direction, and scale bars for measuring distance are provided on both sides of the scale groove. The tester reads the distance between the camera module and the obstacle simulation block from the scale bar, and then compares the distance data simulated by the software with the distance data directly read, and then adjusts the software program in the camera module according to the data deviation between the two, thereby improving the distance measurement accuracy of the camera module and enhancing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments are briefly introduced below.

[0018] Figure 1 This is a front structural schematic diagram of a calibration fixture for a ranging camera module in one embodiment of the utility model;

[0019] Figure 2 The figure is a schematic cross-sectional structure diagram of a calibration fixture of a ranging camera module in one embodiment of the present invention.

[0020] Reference numerals:

[0021] Shell 10 , top shell 11 , middle shell 12 , bottom shell 13 , obstacle simulation block 20 , protrusion 21 , scale groove 22 , scale bar 23 , camera module installation cavity 30 , adjustment handle 31 , camera module 40 . DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings.

[0023] This application proposes a calibration fixture for a range-finding camera module. Figure 1 and Figure 2 , including: a shell 10, an obstacle simulation block 20 and a camera module 40. The shell 10 is hollow inside, and a distance measuring cavity is arranged inside. The test cavity includes a first end and a second end opposite to each other. The first end is provided with a camera module 40. The camera module 40 takes a photo of the obstacle simulation block 20, and the software matched with the calibration fixture analyzes and processes the photos taken by the camera module 40, and the software calculates the distance between the camera module 40 and the obstacle simulation block 20. The shooting direction of the camera module 40 is toward the obstacle simulation block 20. The side of the shell 10 is provided with a scale groove 22 in the axial direction, and scale bars 23 for measuring distance are arranged on both sides of the scale groove 22. The tester reads the distance between the camera module 40 and the obstacle simulation block 20 from the scale bar 23, and then compares the distance data simulated by the software with the distance data directly read, and then adjusts the software program in the camera module 40 according to the data deviation between the two, thereby improving the distance measurement accuracy of the camera module 40 and enhancing the user experience. The obstacle simulation block 20 is movably disposed on the housing 10 between the first end and the second end, so that the tester can test multiple sets of data of the camera module 40 by moving the obstacle simulation block 20 to further improve the accuracy of the calibration fixture. Preferably, the obstacle simulation block 20 is in the shape of a cube or a cylinder.

[0024] It should be noted that the camera module 40 is at the "0" scale line in the scale bar during the test, and the actual value of the distance between the obstacle simulation block 20 and the camera module 40 is measured. The length of the scale bar can be 1 meter, 5 meters or 10 meters. The camera module 40 can be a single camera or a dual camera module. The calibration fixture of the ranging camera module can not only measure the distance between the camera module and the obstacle simulation block 20, but also measure the lateral distance of the camera module, because the camera module 40 can only capture the field of view of its own size. Please refer to Figure 2 A scale bar is provided on the obstacle simulation block 20, and the camera module 40 shoots the scale bar toward the obstacle simulation block 20. The length data of the camera module 40 measured by the software is compared with the data on the read photo to determine whether the distance measured horizontally by the camera module 40 is accurate.

[0025] In one embodiment, a sliding groove is provided in the ranging cavity, and the obstacle simulation block 20 is movably provided in the sliding groove, so that the obstacle simulation block 20 can move smoothly in the sliding groove, reducing the resistance to the movement of the obstacle simulation block 20. For further information, please refer to Figure 2 , the obstacle simulation block 20 is provided with a protrusion 21 at the matching position with the scale groove 22, and the protrusion 21 is movably abutted in the scale groove 22, wherein the movable groove is connected to the ranging cavity. When the obstacle simulation block 20 moves, the tester quickly locates to the corresponding position of the scale bar 23 through the protrusion 21 on the obstacle simulation block 20, thereby improving the accuracy and reading efficiency of the tester reading the data. Further, a triangular character is provided on the protrusion 21, and one of the corners of the triangular character is vertically pointed to the scale on the scale bar 23, so that the tester can further improve the accuracy and reading efficiency of the read data. Further, the side of the housing 10 is provided with an adjustment groove in the axial direction, and the adjustment groove is connected to the ranging cavity. An adjustment handle 31 is provided on the obstacle simulation block 20, and the adjustment handle 31 extends into the adjustment groove. The adjustment handle 31 is movably arranged in the adjustment groove with the obstacle simulation block 20, which is conducive to the tester adjusting the distance between the obstacle simulation block 20 and the camera module 40 in the adjustment groove. When the camera module 40 has finished testing a set of data, the tester adjusts the adjustment handle 31 to drive the obstacle simulation block 20 to move in the adjustment slot, reducing the resistance to the movement of the obstacle simulation block 20, thereby improving the efficiency of the movement of the obstacle simulation block 20. In addition, the obstacle simulation block 20 is provided with fluorescent characters at the shooting end of the camera module 40, so that the fluorescent characters on the obstacle simulation block 20 photographed by the camera module 40 are more obvious, and the software calculates the distance between the camera module 40 and the obstacle simulation block 20 and converts it into the distance between the camera module 40 and the fluorescent characters, so that the camera module 40 can more easily identify the obstacle simulation block 20.

[0026] In another embodiment, a camera module installation cavity 30 is provided at the first end, and a camera module 40 is arranged in the camera module installation cavity 30, so that the camera module 40 can be stably arranged on the calibration fixture, so that the camera module 40 can focus on the obstacle simulation block 20. The camera module installation cavity 30 is connected to the ranging cavity, so that the camera module 40 can clearly capture the obstacle simulation block 20 in the ranging cavity. Preferably, the housing 10 is cylindrical. Further, the housing 10 includes a top shell 11, a middle shell 12 and a bottom shell 13. The top shell 11 is arranged at one end of the middle shell 12, the bottom shell 13 is arranged at the other end of the middle shell 12, and the camera module 40 is arranged on the bottom shell 13. When the top shell 11 or the bottom shell 13 is not assembled, the obstacle simulation block 20 is first installed in the ranging cavity, and the housing 10 is divided into the top shell 11, the middle shell 12 and the bottom shell 13 for assembly, so that the obstacle simulation block 20 is assembled in the ranging cavity. In addition, the top shell 11 and the bottom shell 13 are respectively screwed with the middle shell 12, which is simple to assemble and easy to maintain.

[0027] It should be noted that two camera module mounting cavities 30 are provided on the calibration fixture of the ranging camera module, and two camera modules 40 can be tested simultaneously, thereby improving the calibration efficiency. In addition, scale grooves 22 are provided on both sides of the housing 10, and a scale bar 23 is provided on one side of the scale groove 22, thereby improving the efficiency of reading.

[0028] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A calibration fixture for a ranging camera module, characterized in that: include: Shell and obstacle simulation blocks; The shell is hollow inside and is provided with a ranging cavity therein. The ranging cavity includes a first end and a second end opposite to each other. The first end is used to set a camera module. The obstacle simulation block is movably arranged on the shell between the first end and the second end. The shooting direction of the camera module is toward the obstacle simulation block. A scale groove is opened on the side of the shell in the axial direction. Scale bars for measuring distance are arranged on both sides of the scale groove.

2. The calibration jig for the ranging camera module according to claim 1, characterized in that: The obstacle simulation block is provided with a convex block at the matching position with the scale groove, and the convex block is movably abutted in the scale groove.

3. The calibration jig for the ranging camera module according to claim 2, characterized in that: A triangular character is arranged on the protrusion, and one corner of the triangular character vertically points to the scale bar.

4. The calibration jig for the ranging camera module according to claim 1, characterized in that: An adjustment slot is formed on the side surface of the shell along the axial direction, and an adjustment handle is provided on the obstacle simulation block, and the adjustment handle extends into the adjustment slot.

5. The calibration jig for the ranging camera module according to claim 1, characterized in that: A sliding groove is arranged in the distance measuring cavity, and the obstacle simulation block is movably arranged in the sliding groove.

6. The calibration jig for the ranging camera module according to claim 1, characterized in that: The obstacle simulation block is provided with fluorescent characters at the shooting end of the camera module.

7. The calibration jig for the ranging camera module according to claim 1, characterized in that: The first end is provided with a camera module installation cavity, the camera module installation cavity is communicated with the ranging cavity, and the camera module is arranged on the camera module installation cavity.

8. The calibration jig for the ranging camera module according to claim 1, characterized in that: The shell is in a cylindrical shape.

9. The calibration jig for the ranging camera module according to claim 1, characterized in that: The housing comprises a top shell, a middle shell and a bottom shell, wherein the top shell is arranged at one end of the middle shell, and the bottom shell is arranged at the other end of the middle shell.

10. The calibration jig for the ranging camera module according to claim 9, characterized in that: The top shell and the bottom shell are respectively screwed to the middle shell.

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