Jig for calibrating internal reference of single camera module

Abstract

The utility model relates to the technical field of parameter measurement, in particular to a single camera module internal reference calibration jig which comprises a bottom plate, a supporting seat, a calibration plate and a pressing block. The supporting seat is arranged on the bottom plate; a plurality of fixing holes are formed in the bottom plate; the calibration plate is arranged on the supporting seat; a camera is arranged on the calibration plate; a bolt is arranged on the supporting seat; the bolt penetrates through the pressing block; the pressing block is arranged on one side of the calibration plate away from the supporting seat. Many circuit boards used for internal reference calibration on jigs are fixed on the jigs through plug pins, screws and the like, however, when the circuit boards move, the circuit boards shake, shake and the like due to the fixing mode, and calibrated parameters are not accurate enough. Compared with the prior art, the calibration plate is provided with the pressing block, the pressing block is limited through some structures on the supporting seat, and the pressing block presses the calibration plate, so that the calibration plate is kept stable in the moving process, and measured data are more accurate.

Description

TECHNICAL FIELD

[0001] The utility model relates to parameter determination technical field especially, relate to a single camera module inner parameter calibration fixture. BACKGROUND

[0002] Camera inner parameter calibration test mainly is the process of determining some parameters inside camera. Camera inner parameter includes focal length, optical center (main point) coordinate, pixel horizontal and vertical ratio and other information. Calibration test is to accurately calculate these parameters by using specific algorithm and tool and using known calibration object (such as checkerboard). For example, place checkerboard in front of camera, shoot from different angles, then software analyzes the pixel position change of checkerboard corner point in these images to calculate inner parameter. The purpose of doing this is to correct camera distortion and make the shape and size of the object shot more accurate.

[0003] Some single camera module inner parameter calibration fixtures change different angles by setting the fixture on the related moving device and moving the fixture by the device. Many circuit boards for inner parameter calibration on the fixture are fixed on the fixture by way of bolt, screw and other ways. However, when moving, the fixing way will cause the circuit board to shake, swing and other situations, resulting in inaccurate calibration parameters. UTILITY MODEL CONTENT

[0004] In view of the technical problems of the prior art, the utility model provides a single camera module inner parameter calibration fixture.

[0005] To solve the above technical problems, the utility model provides the following technical scheme:

[0006] A single camera module inner parameter calibration fixture, comprising: a bottom plate, a support seat, a calibration plate, a pressing block; the support seat is arranged on the bottom plate; a plurality of fixing holes are formed in the bottom plate; the calibration plate is arranged on the support seat; a camera is arranged on the calibration plate; a bolt is arranged on the support seat; the bolt passes through the pressing block; the pressing block is arranged on the side of the calibration plate away from the support seat.

[0007] Further, the support seat further comprises: a limiting plate; two limiting plates are arranged on the two sides of the support seat; the limiting plate is in L shape; the two limiting plates are oppositely arranged.

[0008] Further, the number of the pressing blocks is two; the limiting plate corresponds to the pressing block, so that the two sides of the pressing block can be attached to the two sides of the limiting plate.

[0009] Further, it further comprises: a connecting plate; the two ends of the connecting plate are connected with the two pressing blocks respectively.

[0010] Further, the support base further comprises: a limiting groove, a support block; the limiting groove is oppositely arranged on both sides of the support base; the support block is arranged on one side of the limiting groove; the number of the support blocks is several; the top ends of the support blocks are flush; the top end of the support block is lower than the top end of the limiting groove.

[0011] Further, the calibration plate further comprises: a circuit board, a socket; the camera is arranged on the side of the circuit board away from the support base, and the socket is arranged on the other side of the circuit board; the circuit board is placed on the support block; the circuit board is attached to the side wall of the limiting groove.

[0012] Further, the support base further comprises: a positioning rod; a positioning hole is arranged on the circuit board; the positioning rod is arranged in the limiting groove; the positioning rod extends into the positioning hole.

[0013] The beneficial effects of the utility model are that: the pressing block is arranged on the calibration plate, the pressing block is limited by some structures on the support base, and the calibration plate is pressed, so that the calibration plate is kept stable during movement, and the measured data is more accurate.

[0014] The limiting groove, the support block and other structures corresponding to the calibration plate are arranged on the support base, so that the circuit board can be accurately arranged at the corresponding position, and the structures of the circuit board and other components are prevented from being in contact or generating excessive pressure, and the circuit board is prevented from being damaged unnecessarily. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 The utility model discloses a structure schematic diagram.

[0016] Fig. 2 The utility model discloses part structure schematic diagram.

[0017] Fig. 3 The utility model discloses the structure schematic diagram of removing the pressing block and the connecting plate.

[0018] In the drawing: 1, bottom plate;11, fixed hole;2, support base;21, bolt;22, limiting plate;23, limiting groove;24, support block;25, positioning rod;3, calibration plate;31, camera;32, circuit board;321, positioning hole;33, socket;4, pressing block;5, connecting plate. DETAILED DESCRIPTION

[0019] The following is the specific embodiment of the utility model and is combined with the drawings, and the technical scheme of the utility model is further described, but the utility model is not limited to these embodiments.

[0020] According to Figs. 1-3 The utility model provides a single camera module inner parameter calibration fixture, which comprises: a bottom plate 1, a support base 2, a calibration plate 3, a pressing block 4 and a connecting plate 5.

[0021] The support base 2 is arranged on the bottom plate 1. The bottom plate 1 is provided with a plurality of fixing holes 11. The calibration plate 3 is arranged on the support base 2. The calibration plate 3 is provided with a camera 31. The support base 2 is provided with a bolt 21. The bolt 21 passes through the pressing block 4. The pressing block 4 is arranged on the side of the calibration plate 3 away from the support base 2.

[0022] The bottom plate 1 is provided with a plurality of fixing holes 11, which are used to arrange the bottom plate 1 on a related mobile device. When the mobile device is started, the bottom plate 1 can be driven to move, and the support base 2 is driven to move by the movement of the bottom plate 1. The calibration plate 3 is driven to move by the movement of the support base 2. The camera 31 is arranged on the calibration plate 3, so that the camera 31 also moves, thereby changing the angle of the camera 31 shooting the chessboard grid, so as to infer the intrinsic parameter. However, the general calibration plate 3 is fixed by point fixing such as a bolt and a screw, so that the calibration plate 3 is prone to shaking during the movement, which affects the shooting result. The utility model is provided with the pressing block 4, and the support base 2 is provided with the bolt 21, so that the bolt 21 passes through the pressing block 4, and then the pressing block 4 is pressed on the calibration plate 3. The pressing block 4 is positioned by the bolt 21, so that the pressing block 4 presses the calibration plate 3. Since the contact area of the pressing block and the calibration plate 3 is large, if the calibration plate 3 shakes, it becomes more difficult, so that the calibration plate 3 remains stable during the movement, and the measured data is more accurate.

[0023] The support base 2 further comprises: a limiting plate 22. Two limiting plates 22 are arranged on the two sides of the support base 2. The limiting plate 22 is L-shaped. The two limiting plates 22 are oppositely arranged. The number of the pressing blocks 4 is two. The limiting plate 22 corresponds to the pressing block 4, so that the two sides of the pressing block 4 can be fitted with the two sides of the limiting plate 22. The two ends of the connecting plate 5 are connected with the two pressing blocks 4 respectively.

[0024] The L-shaped limiting plate 22 is arranged on the support base 2. When the bolt 21 passes through the pressing block 4, the two sides of the pressing block 4 are fitted with the two sides of the L-shaped limiting plate 22, so that the pressing block 4 is pressed on the calibration plate 3 in a certain posture, so as to ensure that the pressing block 4 can press the calibration plate 3, and does not interfere with other structures on the calibration plate 3. Meanwhile, the two pressing blocks 4 are connected by the connecting plate 5. When one of the pressing blocks 4 moves, the other pressing block 4 is driven to move. Since the limiting plates 22 are oppositely arranged on the two sides of the support base 2, when the pressing block 4 moves away from the side of the connecting plate 5, the pressing block 4 is resisted by the limiting plate 22. The two pressing blocks 4 are interfered by the connecting plate 5, so that the pressing block 4 is difficult to move, thereby avoiding the pressing block 4 from falling off during the movement of the support base 2.

[0025] The support seat 2 further comprises a limiting groove 23 and a support block 24. The limiting groove 23 is oppositely arranged on both sides of the support seat 2. The support block 24 is arranged on one side of the limiting groove 23. The support block 24 is in a plurality in number. The top ends of the plurality of support blocks 24 are flush. The top ends of the support blocks 24 are lower than the top ends of the limiting groove 23. The calibration plate 3 further comprises a circuit board 32 and a socket 33. The camera 31 is arranged on the side of the circuit board 32 away from the support seat 2, and the socket 33 is arranged on the other side of the circuit board 32. The circuit board 32 is placed on the support blocks 24. The circuit board 32 is attached to the side walls of the limiting groove 23. The support seat 2 further comprises a positioning rod 25. The positioning rod 25 is arranged in the limiting groove 23. The positioning rod 25 extends into the positioning hole 321.

[0026] When the calibration plate 3 is arranged on the support seat 2, mainly the circuit board 32 is arranged on the support seat 2. When arranged, the two sides of the circuit board 32 are attached to the side walls of the two limiting grooves 23 respectively, so as to realize the positioning of the circuit board 32 and ensure that the circuit board 32 is arranged at the specified position. Meanwhile, the positioning rod 25 is arranged in the limiting groove 23, the positioning rod 25 extends into the positioning hole 321 to fix the circuit board 32, and the positioning rod 25 does not pass through the positioning hole 321, so as to avoid the interference between the positioning rod 25 and the pressing block 4. The circuit board 32 is provided with elements on both sides. If the circuit board 32 is directly placed in the limiting groove 23, the elements on one side will be in contact with the bottom end of the limiting groove 23, which is easy to cause damage to the elements. The support block 24 is arranged on one side of the limiting groove 23 in the utility model. When the circuit board 32 is placed, the circuit board 32 is placed on the support block 24, and the surface of the support block 24 in contact with the circuit board 32 is the surface without other elements. By arranging a plurality of support blocks 24, the circuit board 32 can be supported, and some elements will not be damaged due to the interference with other structures. When the support block 24 is arranged, the circuit board 32 can be arranged on the support block 24 after being arranged, and the one side is flush with the top end of the limiting groove 23. When the pressing block 4 is pressed on the support seat 2, the one side is in contact with the circuit board 32, so that if the circuit board 32 shakes, the circuit board 32 will be limited by the pressing block 4 and will not shake. When the circuit board 32 does not shake, the force applied by the pressing block 4 to the circuit board 32 is not too large, so as to avoid that the circuit board 32 is damaged due to excessive extrusion by the pressing block 4.

[0027] The working principle and use process of the utility model are as follows:

[0028] When the utility model is assembled, the bottom plate 1 is arranged on the relative moving device, the supporting seat 2 is connected with the bottom plate 1, then the positioning hole 321 of the circuit board 32 is sleeved on the positioning rod 25, the circuit board 32 is placed on the supporting block 24, the both ends of the circuit board 32 are attached to the inner wall of the limiting slot 23, then the pressing block 4 is sleeved on the bolt 21, the both sides of the pressing block 4 are attached to the both sides of the limiting plate 22 respectively, at this time, the pressing block 4 is pressed on the circuit board 32, the socket 33 is connected with the relative equipment through the adapter wire, the camera 31 arranged on the circuit board 32 is started, then the utility model is moved by the relative moving device, and the chessboard pattern under different angles can be measured.

[0029] In conclusion, the utility model is equipped with the pressing block on the calibration plate, the pressing block is limited by some structures on the supporting seat, and the pressing block presses the calibration plate, so that the calibration plate keeps stable during movement, so that the measured data is more accurate.

[0030] The specific embodiments described herein are merely illustrative of the spirit of the utility model. The skilled in the art of the utility model can make various modifications or supplements to the described specific embodiments or replace with similar ways, but will not deviate from the spirit of the utility model or exceed the range defined by the attached claims.

Claims

1. A single-camera module intrinsic parameter calibration fixture, characterized in that: Include: The bottom plate (1), support seat (2), calibration plate (3), briquetting (4); The support seat (2) is arranged on the bottom plate (1); The bottom plate (1) is provided with a plurality of fixing holes (11); The calibration plate (3) is arranged on the support seat (2); The calibration plate (3) is provided with a camera (31); The support seat (2) is provided with a latch (21); The latch (21) passes through the briquetting (4); The briquetting (4) is arranged on the calibration plate (3) away from the support seat (2) side.

2. The single camera module internal parameter calibration jig according to claim 1, wherein: The support seat (2) further comprises: limiting plate (22); Two limiting plates (22) are arranged on both sides of the support seat (2); The limiting plate (22) is L-shaped; Two limiting plates (22) are oppositely arranged.

3. The single camera module internal parameter calibration jig according to claim 2, wherein: The number of briquetting (4) is two; The limiting plate (22) corresponds to the briquetting (4), so that the two sides of the briquetting (4) can be fitted with the two sides of the limiting plate (22).

4. The single camera module internal parameter calibration jig according to claim 3, wherein: Further comprising: connecting plate (5); Both ends of the connecting plate (5) are connected with two briquetting (4) respectively.

5. The single camera module internal parameter calibration jig according to claim 1, wherein: The support seat (2) further comprises: limiting groove (23), support block (24); The limiting groove (23) is oppositely arranged on both sides of the support seat (2); The support block (24) is arranged on one side of the limiting groove (23); The number of support blocks (24) is several; The top ends of the plurality of support blocks (24) are flush; The top end of the support block (24) is lower than the top end of the limiting groove (23).

6. The single camera module internal parameter calibration jig according to claim 5, wherein: The calibration plate (3) further comprises: circuit board (32), socket (33); The camera (31) is arranged on the side of the circuit board (32) away from the support seat (2), and the socket (33) is arranged on the other side of the circuit board (32); The circuit board (32) is placed on the support block (24); The circuit board (32) is fitted with the side wall of the limiting groove (23).

7. The single camera module internal parameter calibration jig according to claim 6, wherein: The support seat (2) further comprises: positioning rod (25); The circuit board (32) is provided with a positioning hole (321); The positioning rod (25) is arranged in the limiting groove (23); The positioning rod (25) extends into the positioning hole (321).

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