A camera module internal parameter calibration system

Abstract

The utility model provides a camera module internal reference calibration system, including a base, and also including: a slide assembly, arranged on the base; a test fixture, having an installation position for installing a camera module to be calibrated; a calibration chart, facing the installation position and located on the camera side of the camera module to be calibrated; a transfer test PCBA board, having a connector that can be electrically connected to the camera module to be calibrated; an image decoding control box, arranged on the slide assembly, connected to the transfer test PCBA board, for converting the electrical signal transmitted by the transfer test PCBA board into image information; and wherein the transfer test PCBA board is arranged on the image decoding control box, and the test fixture is arranged on the transfer test PCBA board. The utility model can simplify the internal reference calibration operation.

Description

Technical Field

[0001] The utility model relates to the technical field of camera internal parameter calibration, and in particular to a camera module internal parameter calibration system. Background Art

[0002] In the smart electronic product market, the applications of cameras are endless, especially in face recognition, dynamic tracking, intelligent obstacle avoidance, etc. These smart electronic products include drones, smart access control, sweepers, service robots, etc. Along with this comes the need to correct image distortion, i.e., internal reference calibration. The mainstream camera module internal reference calibration system on the market is mainly suitable for automotive cameras and network cameras, and is expensive.

[0003] At present, when the camera is calibrating its internal parameters, different calibration cards are usually replaced without moving the camera to detect the distortion of images taken by the camera at different shooting angles. In this way, the internal parameter calibration of a camera requires replacing the calibration card multiple times, which makes the operation of the camera internal parameter calibration complicated and affects the accuracy of the camera internal parameter calibration.

[0004] Therefore, it is necessary to develop a new camera module intrinsic calibration system to simplify the intrinsic calibration operation and improve the accuracy of camera intrinsic calibration. Utility Model Content

[0005] The utility model aims to provide a camera module internal parameter calibration system to solve the problem of complex operation of the existing camera module internal parameter calibration system.

[0006] To solve the above technical problems, the utility model provides a camera module internal parameter calibration system, comprising a base, and also comprising: a slide assembly, arranged on the base; a test fixture, having an installation position for installing a camera module to be calibrated; a calibration chart, facing the installation position and located on the camera side of the camera module to be calibrated; a transfer test PCBA board, having a connector that can be electrically connected to the camera module to be calibrated; an image decoding control box, arranged on the slide assembly, connected to the transfer test PCBA board, and used for converting the electrical signal transmitted by the transfer test PCBA board into image information; and wherein the transfer test PCBA board is arranged on the image decoding control box, and the test fixture is arranged on the transfer test PCBA board.

[0007] Optionally, the slide assembly includes an X-axis slide, a Y-axis slide, a C-axis slide, an A-axis slide and a B-axis slide, the X-axis slide is a linear slide and is arranged on the base, the Y-axis slide is a linear slide and is arranged on the output end of the X-axis slide, the C-axis slide is a slide that rotates around the Z-axis, and the C-axis slide is arranged on the output end of the Y-axis slide, the A-axis slide is a slide that rotates around the X-axis, and the A-axis slide is arranged on the output end of the C-axis slide, the B-axis slide is a slide that rotates around the Y-axis, and the B-axis slide is arranged on the output end of the A-axis slide, and the image decoding control box is arranged on the output end of the B-axis slide.

[0008] Optionally, the X-axis slide table includes an X-axis slide rail and an X-axis slide seat, the X-axis slide rail is arranged on the base, the X-axis slide seat is slidably connected to the X-axis slide rail, and the Y-axis slide table is arranged on the X-axis slide seat.

[0009] Optionally, the X-axis slide also includes a first X-axis positioning member and an X-axis positioning block, the first X-axis positioning member is mounted on the base, the X-axis positioning block is mounted on the X-axis slide, and the X-axis positioning block cooperates with the first X-axis positioning member to limit a position of the X-axis slide.

[0010] Optionally, the X-axis slide table further includes a second X-axis positioning member, which is mounted on the base, and the X-axis positioning block cooperates with the second X-axis positioning member to limit another position of the X-axis slide table.

[0011] Optionally, the X-axis slide also includes an intermediate X-axis positioning member, which is installed on the base, and the X-axis positioning block cooperates with the intermediate X-axis positioning member to limit another position of the X-axis slide, and the intermediate X-axis positioning member is located between the first X-axis positioning member and the second X-axis positioning member.

[0012] Optionally, the X-axis slide table further includes an X-axis fastener, and the X-axis fastener can pass through the X-axis slide seat and rest against the X-axis slide rail.

[0013] Optionally, the Y-direction slide includes a Y-direction slide rail and a Y-direction slide seat, the Y-direction slide rail is arranged on the X-direction slide seat, the Y-direction slide seat is slidably connected to the Y-direction slide rail, and the C-direction slide is arranged on the Y-direction slide seat.

[0014] Optionally, the Y-axis slide also includes a first Y-axis positioning member and a Y-axis positioning block, the first Y-axis positioning member is installed on the X-axis slide, the Y-axis positioning block is installed on the Y-axis slide, and the Y-axis positioning block cooperates with the first Y-axis positioning member to limit a position of the Y-axis slide.

[0015] Optionally, the Y-axis slide further includes a second Y-axis positioning member, which is mounted on the X-axis slide, and the Y-axis positioning block cooperates with the second Y-axis positioning member to limit another position of the Y-axis slide.

[0016] The utility model provides a camera module internal parameter calibration system, which has the following beneficial effects:

[0017] Since the slide assembly is arranged on the base, the image decoding control box is arranged on the slide assembly, the transfer test PCBA board is arranged on the image decoding control box, the test fixture is arranged on the transfer test PCBA board, and the test fixture has a mounting position for the camera module to be calibrated, the position of the test fixture relative to the base is adjustable, that is, the position of the camera module relative to the base is adjustable; since the calibration chart card is opposite to the mounting position and is located on the camera side of the camera module to be calibrated, and its position relative to the base is fixed, therefore, the position of the camera module relative to the calibration chart card is adjustable, and the camera module collects images of the calibration chart card. Image information, so that the position of the camera module relative to the calibration card can be adjusted to obtain image information of different angles and different positions of the calibration card; and the transfer test PCBA board has a connector that can be electrically connected to the camera module to be calibrated, the image decoding control box is connected to the transfer test PCBA board, and is used to convert the electrical signal transmitted by the transfer test PCBA board into image information, the controller receives the image information converted by the image decoding control box, thereby completing the collection of image information of the calibration card, which is convenient for subsequent calibration of the camera module; since there is no need to replace the calibration card to adjust the position of the slide assembly, the operation of the camera module internal reference calibration system is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of a camera module internal reference calibration system in one viewing angle in an embodiment of the utility model;

[0019] Figure 2 It is a three-dimensional structural schematic diagram of another viewing angle of the camera module internal parameter calibration system in an embodiment of the utility model.

[0020] Description of reference numerals:

[0021] 100 - base;

[0022] 210-X-axis slide; 211-X-axis slide rail; 212-X-axis slide seat; 213-first X-axis positioning member; 214-X-axis positioning block; 215-second X-axis positioning member; 216-middle X-axis positioning member; 219-X-axis fastener; 220-Y-axis slide; 221-Y-axis slide rail; 222-Y-axis slide seat; 223-first Y-axis positioning member; 224-Y-axis positioning block; 225-second Y-axis positioning member; 226-middle Y-axis positioning member; 230-C-axis slide; 233-C-axis positioning member; 240-A-axis slide; 250-B-axis slide;

[0023] 300-Test fixture;

[0024] 400- transfer test PCBA board;

[0025] 500-Image decoding control box. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] refer to Figure 1 and Figure 2 , Figure 1 1 is a schematic diagram of a three-dimensional structure of a camera module internal reference calibration system in an embodiment of the utility model from one viewing angle. Figure 2 : is a three-dimensional structural schematic diagram of another perspective of the camera module internal parameter calibration system in the embodiment of the utility model. This embodiment provides a camera module internal parameter calibration system, including:

[0033] Base 100;

[0034] A slide assembly, arranged on the base 100;

[0035] A test fixture 300 having a mounting position for mounting a camera module to be calibrated;

[0036] A calibration chart, facing the installation position and located on the camera side of the camera module to be calibrated;

[0037] A transfer test PCBA board 400 having a connector that can be electrically connected to the camera module to be calibrated;

[0038] An image decoding control box 500, which is disposed on the slide assembly and connected to the transfer test PCBA board 400, and is used to convert the electrical signal transmitted by the transfer test PCBA board 400 into image information; and

[0039] The transfer test PCBA board 400 is arranged on the image decoding control box 500 , and the test fixture 300 is arranged on the transfer test PCBA board 400 .

[0040] Since the slide assembly is arranged on the base 100, the image decoding control box 500 is arranged on the slide assembly, the transfer test PCBA board 400 is arranged on the image decoding control box 500, and the test fixture 300 is arranged on the transfer test PCBA board 400, and the test fixture 300 has a mounting position for installing the camera module to be calibrated, the position of the test fixture 300 relative to the base 100 is adjustable, that is, the position of the camera module relative to the base 100 is adjustable; since the calibration chart is opposite to the mounting position and is located on the camera side of the camera module to be calibrated, and its position relative to the base 100 is fixed, therefore, the position of the camera module relative to the calibration chart is adjustable, and the camera module The image information of the calibration card is collected by the group, so that the image information of the calibration card at different angles and positions can be obtained by adjusting the position of the camera module relative to the calibration card; and the transfer test PCBA board 400 has a connector that can be electrically connected to the camera module to be calibrated, the image decoding control box 500 is connected to the transfer test PCBA board 400, and is used to convert the electrical signal transmitted by the transfer test PCBA board 400 into image information, and the controller receives the image information converted by the image decoding control box 500, thereby completing the collection of the image information of the calibration card, which is convenient for the subsequent calibration of the camera module; since there is no need to replace the calibration card to adjust the position of the slide assembly, the operation of the camera module internal reference calibration system is simple.

[0041] The image decoding control box 500 is a commonly used image decoding control box in the prior art, and its product model may be Duxin MU960.

[0042] The slide assembly is a five-axis slide, including an X-axis slide 210, a Y-axis slide 220, a C-axis slide 230, an A-axis slide 240 and a B-axis slide 250. The X-axis slide 210 is a linear slide and is arranged on the base 100. The Y-axis slide 220 is a linear slide and is arranged on the output end of the X-axis slide 210. The C-axis slide 230 is a slide that rotates around the Z-axis, and the C-axis slide 230 is arranged on the output end of the Y-axis slide 220. The A-axis slide 240 is a slide that rotates around the X-axis, and the A-axis slide 240 is arranged on the output end of the C-axis slide 230. The B-axis slide 250 is a slide that rotates around the Y-axis, and the B-axis slide 250 is arranged on the output end of the A-axis slide 240. The image decoding control box 500 is arranged on the output end of the B-axis slide 250. In this way, the position of the camera module on the test fixture 300 can be adjusted from five dimensions.

[0043] The X-axis slide 210 includes an X-axis slide rail 211 and an X-axis slide seat 212 . The X-axis slide rail 211 is disposed on the base 100 . The X-axis slide seat 212 is slidably connected to the X-axis slide rail 211 . The Y-axis slide 220 is disposed on the X-axis slide seat 212 .

[0044] The X-direction slide 210 further includes a first X-direction positioning member 213 and an X-direction positioning block 214, wherein the first X-direction positioning member 213 is mounted on the base 100, and the X-direction positioning block 214 is mounted on the X-direction slide 212, and the X-direction positioning block 214 cooperates with the first X-direction positioning member 213 to limit a position of the X-direction slide 212. In this way, the camera module on the measuring and setting fixture can be easily adjusted to a fixed position in the X direction.

[0045] Specifically, the X-direction positioning block 214 has a first X-direction magnet, the first X-direction positioning member 213 has a second X-direction magnet, and the first X-direction magnet and the second X-direction magnet attract each other. In this way, after the X-direction positioning block 214 hits the first X-direction positioning member 213, the positions of the two can be relatively fixed.

[0046] The X-direction slide 210 further includes a second X-direction positioning member 215 , which is mounted on the base 100 . The X-direction positioning block 214 cooperates with the second X-direction positioning member 215 to limit another position of the X-direction slide 212 .

[0047] Specifically, the second X-direction positioning member 215 has a third X-direction magnet, and the third X-direction magnet and the first X-direction magnet attract each other.

[0048] The X-axis slide 210 also includes an intermediate X-axis positioning member 216, which is installed on the base 100. The X-axis positioning block 214 cooperates with the intermediate X-axis positioning member 216 to limit another position of the X-axis slide 212, and the intermediate X-axis positioning member 216 is located between the first X-axis positioning member 213 and the second X-axis positioning member 215.

[0049] Specifically, the intermediate X-direction positioning member 216 includes an X-direction positioning seat and an X-direction positioning rotating block, the X-direction positioning rotating block is rotatably connected to the X-direction positioning seat, and the X-direction positioning rotating block cooperates with the X-direction positioning block 214 to limit the sliding of the X-direction slide 212. Specifically, the X-direction positioning rotating block can only play a role in limiting the sliding of the X-direction slide 212 after rotating to cooperate with the X-direction positioning block 214. When the X-direction positioning rotating block rotates to other positions, the X-direction slide 212 can slide relative to the X-direction positioning rotating block. The X-direction positioning rotating block has a fourth X-direction magnet, and the fourth X-direction magnet is attracted to the first X-direction magnet.

[0050] The X-axis slide 210 also includes an X-axis fastener 219, which can pass through the X-axis slide seat 212 and abut against the X-axis slide rail 211. In this way, it can avoid that the first X-axis magnet and the second X-axis magnet, the third X-axis magnet or the fourth X-axis magnet are not firmly adsorbed, resulting in the X-axis slide seat 212 still moving relative to the X-axis slide rail 211 after moving to a predetermined position, affecting the accuracy of the information on the calibration card collected by the camera module.

[0051] The Y-direction slide 220 includes a Y-direction slide rail 221 and a Y-direction slide seat 222 . The Y-direction slide rail 221 is disposed on the X-direction slide seat 212 . The Y-direction slide seat 222 is slidably connected to the Y-direction slide rail 221 . The C-direction slide 230 is disposed on the Y-direction slide seat 222 .

[0052] The Y-direction slide 220 further includes a first Y-direction positioning member 223 and a Y-direction positioning block 224. The first Y-direction positioning member 223 is mounted on the X-direction slide 212, and the Y-direction positioning block 224 is mounted on the Y-direction slide 222. The Y-direction positioning block 224 cooperates with the first Y-direction positioning member 223 to limit a position of the Y-direction slide 222. In this way, the camera module on the measuring and setting fixture can be easily adjusted to a fixed position in the Y direction.

[0053] Specifically, the Y-direction positioning block 224 has a first Y-direction magnet, the first Y-direction positioning member 223 has a second Y-direction magnet, and the first Y-direction magnet and the second Y-direction magnet attract each other. In this way, after the Y-direction positioning block 224 hits the first Y-direction positioning member 223, the positions of the two are relatively fixed.

[0054] The Y-direction slide 220 further includes a second Y-direction positioning member 225 , which is mounted on the X-direction slide 212 . The Y-direction positioning block 224 cooperates with the second Y-direction positioning member 225 to limit another position of the Y-direction slide 222 .

[0055] Specifically, the second Y-direction positioning member 225 has a third Y-direction magnet, and the third Y-direction magnet and the first Y-direction magnet attract each other.

[0056] The Y-axis slide 220 also includes an intermediate Y-axis positioning member 226, which is installed on the X-axis slide 212. The Y-axis positioning block 224 cooperates with the intermediate Y-axis positioning member 226 to limit another position of the Y-axis slide 222, and the intermediate Y-axis positioning member 226 is located between the first Y-axis positioning member 223 and the second Y-axis positioning member 225.

[0057] Specifically, the intermediate Y-direction positioning member 226 includes a Y-direction positioning seat and a Y-direction positioning rotating block, the Y-direction positioning rotating block is rotatably connected to the Y-direction positioning seat, and the Y-direction positioning rotating block cooperates with the Y-direction positioning block 224 to limit the sliding of the Y-direction slide 222. Specifically, the Y-direction positioning rotating block can only play a role in limiting the sliding of the Y-direction slide 222 after rotating to cooperate with the Y-direction positioning block 224. When the Y-direction positioning rotating block rotates to other positions, the Y-direction slide 222 can slide relative to the Y-direction positioning rotating block. The Y-direction positioning rotating block has a fourth Y-direction magnet, and the fourth Y-direction magnet is attracted to the first Y-direction magnet.

[0058] The C-direction slide 230 includes a C-direction rotating seat and a C-direction turntable. The C-direction rotating seat is arranged on the Y-direction slide 222. The C-direction turntable is rotatably connected to the C-direction rotating seat. The A-direction slide 240 is arranged on the C-direction turntable.

[0059] The C-axis slide 230 further includes a C-axis positioning member 233, which is disposed on the Y-axis slide 222, and the C-axis turntable is provided with an arc-shaped limiting groove that matches the C-axis positioning member 233. In this way, the C-axis turntable can be limited to rotate to a fixed position relative to the C-axis turntable.

[0060] In this embodiment, the arc angle of the arc-shaped limiting groove is 90°.

[0061] The above description is only a description of the preferred embodiment of the utility model, and is not any limitation on the scope of the utility model. Any changes and modifications made by ordinary technicians in the field of the utility model based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A camera module internal parameter calibration system, comprising a base, characterized in that: Also includes: A slide assembly is arranged on the base; A test fixture having a mounting position for mounting a camera module to be calibrated; A calibration chart, facing the installation position and located on the camera side of the camera module to be calibrated; A transfer test PCBA board having a connector that can be electrically connected to the camera module to be calibrated; An image decoding control box is arranged on the slide assembly, connected to the transfer test PCBA board, and is used to convert the electrical signal transmitted by the transfer test PCBA board into image information; as well as Wherein, the transfer test PCBA board is arranged on the image decoding control box, and the test fixture is arranged on the transfer test PCBA board.

2. The camera module internal parameter calibration system according to claim 1, characterized in that: The slide assembly includes an X-axis slide, a Y-axis slide, a C-axis slide, an A-axis slide and a B-axis slide. The X-axis slide is a linear slide and is arranged on the base. The Y-axis slide is a linear slide and is arranged on the output end of the X-axis slide. The C-axis slide is a slide that rotates around the Z-axis, and the C-axis slide is arranged on the output end of the Y-axis slide. The A-axis slide is a slide that rotates around the X-axis, and the A-axis slide is arranged on the output end of the C-axis slide. The B-axis slide is a slide that rotates around the Y-axis, and the B-axis slide is arranged on the output end of the A-axis slide. The image decoding control box is arranged on the output end of the B-axis slide.

3. The camera module internal parameter calibration system according to claim 2, characterized in that: The X-direction slide comprises an X-direction slide rail and an X-direction slide seat, wherein the X-direction slide rail is arranged on the base, the X-direction slide seat is slidably connected to the X-direction slide rail, and the Y-direction slide table is arranged on the X-direction slide seat.

4. The camera module internal parameter calibration system as claimed in claim 3, characterized in that: The X-axis slide also includes a first X-axis positioning member and an X-axis positioning block, wherein the first X-axis positioning member is mounted on the base, and the X-axis positioning block is mounted on the X-axis slide, and the X-axis positioning block cooperates with the first X-axis positioning member to limit a position of the X-axis slide.

5. The camera module internal parameter calibration system as claimed in claim 4, characterized in that: The X-direction slide also includes a second X-direction positioning member, which is installed on the base. The X-direction positioning block cooperates with the second X-direction positioning member to limit another position of the X-direction slide.

6. The camera module internal parameter calibration system according to claim 5, characterized in that: The X-axis slide also includes an intermediate X-axis positioning member, which is installed on the base. The X-axis positioning block cooperates with the intermediate X-axis positioning member to limit another position of the X-axis slide, and the intermediate X-axis positioning member is located between the first X-axis positioning member and the second X-axis positioning member.

7. The camera module internal parameter calibration system according to claim 3, characterized in that: The X-direction slide table also includes an X-direction fastener, and the X-direction fastener can pass through the X-direction slide seat and abut against the X-direction slide rail.

8. The camera module internal parameter calibration system according to claim 3, characterized in that: The Y-direction slide comprises a Y-direction slide rail and a Y-direction slide seat, the Y-direction slide rail is arranged on the X-direction slide seat, the Y-direction slide seat is slidably connected with the Y-direction slide rail, and the C-direction slide table is arranged on the Y-direction slide seat.

9. The camera module internal parameter calibration system according to claim 8, characterized in that: The Y-direction slide also includes a first Y-direction positioning member and a Y-direction positioning block. The first Y-direction positioning member is installed on the X-direction slide, and the Y-direction positioning block is installed on the Y-direction slide. The Y-direction positioning block cooperates with the first Y-direction positioning member to limit a position of the Y-direction slide.

10. The camera module internal parameter calibration system according to claim 9, characterized in that: The Y-direction slide also includes a second Y-direction positioning member, which is installed on the X-direction slide. The Y-direction positioning block cooperates with the second Y-direction positioning member to limit another position of the Y-direction slide.

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