A camera calibration device

Abstract

The present invention aims to provide a calibration camera device with a simple structure, easy operation and more accurate calibration. The present invention comprises a camera module, an XY-axis manual slide and a calibration base, wherein the calibration base is provided with an identification groove and an identification center hole, wherein the identification center hole is located in the identification groove, the XY-axis manual slide is arranged on the calibration base, the camera module is arranged at the movable end of the XY-axis manual slide, and the shooting end of the camera module is arranged opposite to the identification groove. The present invention is applied to the field of position calibration technology.

Description

Technical Field

[0001] The present invention is applied to the technical field of position calibration, and in particular relates to a calibration camera device. Background Art

[0002] As the resolution of image sensors continues to increase and the size of single pixels continues to decrease, the accuracy requirements for the relative positioning of the lens and the image sensor are becoming higher and higher, and the current traditional packaging equipment can no longer meet this requirement. AA (full name: Active Alignment) is an active calibration technology that determines the relative position of parts during assembly. It can correct the mechanical errors of each component to ensure the imaging quality of the camera and the consistency of the product. Automated assembly equipment using the AA process generally needs to go through processes such as dispensing, AA, and UV curing when producing camera modules. In the AA process, the relative position of the lens and the image sensor is adjusted in real time through a high-precision motion structure combined with a software algorithm to achieve the best imaging effect.

[0003] During the AA process, it is necessary to accurately obtain the center position of the sensor and lens relative to the center of the clamp, so that the sensor and lens can quickly and accurately reach the working position during the AA process. It is necessary to initialize the position calibration of each part before entering the AA work. In the early stage of the calibration process, a mechanical perforation positioning method was used. In this process, pins were used to simultaneously pass through the center hole of the fake lens clamped by the clamp, the center hole of the lens placement position, the center hole of the fake lens clamped by the clamp, and the center hole of the sensor placement position. The distance between the sensor placement position and the lens placement position is calculated by the system. However, this method has the problem of calibration misalignment due to the large deviation caused by the machining error, and due to the matching of the shaft and the hole, it is difficult to insert the pin, and the overall calibration method is very inconvenient. If a camera calibration device with a simple structure, easy operation and more accurate calibration can be designed, the above problems can be well solved. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a camera calibration device which has a simple structure, is easy to operate and can calibrate more accurately.

[0005] The technical solution adopted by the present invention is: the present invention includes a camera module, an XY-axis manual slide and a calibration base, the calibration base is provided with a calibration groove and a calibration center hole, the calibration center hole is located in the calibration groove, the XY-axis manual slide is arranged on the calibration base, the camera module is arranged at the movable end of the XY-axis manual slide, and the shooting end of the camera module is arranged opposite to the calibration groove.

[0006] Furthermore, the calibration base comprises a calibration plate and a mounting plate which are overlapped with each other, a cavity is arranged on the calibration plate, and the calibration groove is located in the cavity.

[0007] Furthermore, the mounting plate and the XY-axis manual slide are both provided with calibration through holes, the camera module includes a support seat and a CCD camera, the support seat is arranged at the movable end of the XY-axis manual slide, the CCD camera is vertically arranged on the support seat, and the CCD camera is arranged relative to the calibration groove through the calibration through hole.

[0008] Furthermore, a light source is arranged in the cavity.

[0009] The beneficial effects of the present invention are as follows: first, the CCD camera is turned on for shooting and identification. After the calibration groove is identified and aligned with it, the CCD camera is fixedly connected to the support seat. Subsequently, the calibration center hole is identified, and the camera module is driven to move in the X-axis or Y-axis direction by adjusting the adjustment screws of the XY-axis manual slide, so as to align the shooting center of the CCD camera with the calibration center hole. After the adjustment is in place, the various adjustment parts are fixedly connected, and finally the calibration plate is removed to complete the camera calibration. Therefore, the present invention is not only simple in structure, but also compared with the mechanical perforation positioning method, the use of the present invention for calibration is not only easy to operate, but also can avoid the problem of calibration misalignment caused by large deviations caused by mechanical processing errors, greatly improving the accuracy of the calibration results, and is more practical and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a stereogram of the present invention;

[0011] Figure 2 is an exploded view of the present invention;

[0012] Figure 3 yes Figure 2 Enlarged view of point A in the middle. DETAILED DESCRIPTION

[0013] like Figures 1 to 3 As shown, in this embodiment, the present invention includes a camera module, an XY-axis manual slide 1 and a calibration base, the calibration base is provided with a calibration groove 2 and a calibration center hole 3, the calibration center hole 3 is located in the calibration groove 2, the XY-axis manual slide 1 is arranged on the calibration base, the camera module is arranged at the movable end of the XY-axis manual slide 1, and the shooting end of the camera module is arranged opposite to the calibration groove 2.

[0014] In this embodiment, the calibration base includes a calibration plate 4 and a mounting plate 5 which are overlapped with each other. A cavity 6 is provided on the calibration plate 4 , and the calibration groove 2 is located in the cavity 6 .

[0015] In this embodiment, calibration through holes 7 are provided on the mounting plate 5 and the XY-axis manual slide 1, and the camera module includes a support seat 8 and a CCD camera 9. The support seat 8 is provided at the movable end of the XY-axis manual slide 1, and the CCD camera 9 is vertically provided on the support seat 8. The CCD camera 9 is provided opposite to the calibration groove 2 through the calibration through hole 7.

[0016] In this embodiment, a light source 10 is disposed in the cavity 6 .

[0017] In this embodiment, the working principle of the present invention is as follows:

[0018] First, turn on the CCD camera 9 for shooting and identification. After identifying the calibration groove 2 and aligning it, fix the CCD camera 9 with the support seat 8, and then identify the calibration center hole 3. Adjust the adjustment screws of the XY-axis manual slide 1 to drive the camera module to move in the X-axis or Y-axis direction, so that the shooting center of the CCD camera 9 is aligned with the calibration center hole 3. After the adjustment is in place, fix the various adjustment parts and finally remove the calibration plate 4 to complete the camera calibration.

[0019] The external processing system records the camera calibration position as a reference point, and then moves the center hole of the sensor placement position to the shooting position of the CCD camera 9, shoots the center hole of the sensor placement position, and the processing system calculates the center position and records the position of the sensor center position relative to the calibration center hole 3 at this time; similarly, moves the center hole of the lens placement position to the shooting position of the CCD camera 9, shoots the center hole of the lens placement position, and the processing system calculates the center position and records the position of the lens center position relative to the calibration center hole 3 at this time. After determining the position of the center position of the sensor and lens relative to the calibration center hole 3, the distance between the sensor placement position and the lens placement position is finally calculated by the external processing system.

Claims

1. A camera calibration device, characterized in that: It comprises a camera module, an XY-axis manual slide (1) and a calibration base, wherein a calibration groove (2) and a calibration center hole (3) are provided in the calibration base, wherein the calibration center hole (3) is located in the calibration groove (2), wherein the XY-axis manual slide (1) is arranged on the calibration base, wherein the camera module is arranged at the movable end of the XY-axis manual slide (1), wherein the shooting end of the camera module is arranged opposite to the calibration groove (2), wherein the calibration base comprises a calibration plate (4) and a mounting plate (5) which are overlapped with each other, wherein the calibration plate (4) is provided with a cavity (6), the calibration groove (2) is located in the cavity (6), the mounting plate (5) and the XY-axis manual slide (1) are both provided with calibration through holes (7), the camera module comprises a support seat (8) and a CCD camera (9), the support seat (8) is provided at the movable end of the XY-axis manual slide (1), the CCD camera (9) is vertically provided on the support seat (8), and the CCD camera (9) is provided relative to the calibration groove (2) through the calibration through holes (7).

2. A camera calibration device according to claim 1, characterized in that: A light source (10) is arranged in the cavity (6).

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