Convenient-to-calibrate calibration plate for telecentric lens

Abstract

The utility model discloses a telecentric lens calibration plate convenient to calibrate, which comprises a base and a calibration plate body, two sides of the outer surface of the calibration plate body are provided with grooves, and one side of the inner surface of the calibration plate body is fixedly connected with a support rod. According to the telecentric lens calibration plate convenient to calibrate, through the arrangement of the base, the calibration plate body, the supporting rod, the clamping plate, the first spring and the baffle plate, when a user needs to use the calibration plate body to calibrate a lens during use, one side, with the clamping plate, of the calibration plate body is taken up to be in butt joint with the interior of the baffle plate of the other calibration plate body; when the two calibration plate bodies form butt-joint dislocation, one side of the calibration plate body with the clamping plate slides upwards, so that the baffle plate limits the sliding of the clamping plate through the supporting rod, the lower baffle plate limits the sliding of the lower clamping plate through the supporting rod in a similar way, and the clamping plates on the two sides can form clamping connection with the baffle plates through the acting force of the first springs, so that the calibration plate bodies are spliced, and the calibration effect is improved. And the size of the calibration plate body is changed.

Description

Technical Field

[0001] The utility model relates to the technical field of measurement, in particular to a calibration plate for a telecentric lens which is convenient for calibration. Background Art

[0002] In the field of computer vision and image processing, calibration plates are an important tool, widely used in technologies such as camera calibration, 3D reconstruction, and object recognition. Calibration plates usually consist of a flat plate and a specific pattern (such as a checkerboard, dot array, or stripes). These patterns are used to provide reference points to facilitate the analysis of the position and posture of objects in the image. Camera calibration is a key step in improving the accuracy of computer vision systems. By calibrating the camera, its intrinsic and extrinsic parameters can be obtained, thereby removing lens distortion and improving measurement accuracy. The calibration plate helps researchers obtain information such as the camera's projection matrix and optical center through its accurate geometric features.

[0003] The existing calibration plates on the market do not have the function of adjusting the size. When they need to be used in different application scenarios (such as close-up or long-distance shooting), they may not meet the requirements. For example, in industrial vision systems, different detection tasks may require calibration of different scales. The camera may not be able to clearly identify feature points when shooting at a distance, thus affecting the final calibration effect. Oversized calibration plates may be difficult to use when shooting at close range, especially in a small space, and manual fixation may not guarantee that the calibration plate remains stable throughout the calibration process. If the calibration plate moves or tilts, it may cause measurement errors and affect the accuracy of the calibration results. Utility Model Content

[0004] The main purpose of the utility model is to provide a calibration plate for a telecentric lens that is easy to calibrate, which can effectively solve the problems in the background technology.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A calibration plate for a telecentric lens that is easy to calibrate comprises a base and a calibration plate body, grooves are provided on both sides of the outer surface of the calibration plate body, a support rod is fixedly connected to one side of the inner surface of the calibration plate body, a clamping plate is slidably connected to one side of the outer surface of the support rod, and a first spring is fixedly connected to one side of the outer surface of the support rod; the clamping plates are arranged on both sides of the first spring, and a baffle is provided on the other side of the outer surface of the calibration plate body.

[0007] In order to achieve the purpose of clamping, the utility model is a calibration plate for a telecentric lens that is easy to calibrate. The upper surface of the base is fixedly connected to a first support plate, one side of the inner wall of the first support plate is rotatably connected to a support arm, the top end of the support arm is fixedly connected to a second support plate, and one side of the outer surface of the second support plate is rotatably connected to a calibration clamp.

[0008] In order to achieve the effect of power transmission, the utility model is a calibration plate for a telecentric lens that is easy to calibrate. A third support plate is fixedly connected to one side of the upper surface of the base, and a cylinder is rotatably connected to one side of the inner wall of the third support plate. The output end of the cylinder is rotatably connected to the support arm.

[0009] In order to provide support, the utility model is a calibration plate for a telecentric lens that is easy to calibrate. A fourth support plate is fixedly connected to one side of the upper surface of the base, a groove is provided on one side of the inner surface of the fourth support plate, and a first support column is fixedly connected to one side of the inner surface of the fourth support plate.

[0010] In order to have the function of placing the calibration plate body, as a calibration plate for a telecentric lens that is easy to calibrate, the outer surface of the first support column is fixedly connected to a second spring on one side, and the outer surface of the first support column is slidably connected to a placement seat on one side.

[0011] In order to achieve an accurate effect, as a calibration plate for a telecentric lens that is easy to calibrate, the utility model has a characteristic point set on one side of the outer surface of the calibration plate body.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. In the utility model, through the arrangement of the base, the calibration plate body, the support rod, the card plate, the first spring and the baffle, when in use, the user needs to use the calibration plate body to calibrate the lens, and picks up the calibration plate body with the card plate on one side and docks it with the inside of the baffle of the other calibration plate body. When the two calibration plate bodies form a docking misalignment, slide the calibration plate body with the card plate on the side upward so that the baffle restricts the card plate from sliding through the support rod. Similarly, the lower baffle restricts the lower card plate from sliding through the support rod. The card plates on both sides can be connected with the baffle through the force of the first spring, thereby achieving the effect of splicing the calibration plate body and changing the size of the calibration plate body.

[0014] 2. In the utility model, through the arrangement of the first support plate, the support arm, the second support plate, the calibration clamp, the third support plate, the cylinder, the fourth support plate, the first support column, the second spring, and the placement seat, when in use, the calibration plate is placed in the placement seat, the calibration plate is pressed downward, the placement seat moves downward, the cylinder is started, the cylinder contracts, and the support arm rotates with the first support plate as the axis, and the cylinder rotates with the fourth support plate as the axis, driving the calibration clamp to clamp the calibration plate to prevent the calibration plate from positional displacement. After calibration is completed, the calibration clamp is opened by moving the output end of the cylinder forward, and the placement seat is moved upward by the reaction force of the second spring, driving the calibration plate to move upward, so as to achieve the purpose of easy picking up. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the main structure of an embodiment of the utility model;

[0016] Figure 2 This is a schematic diagram of the calibration plate body structure of an embodiment of the utility model;

[0017] Figure 3 This is a schematic diagram of the calibration clamp structure of an embodiment of the utility model;

[0018] Figure 4 This is a schematic diagram of the card structure of an embodiment of the utility model;

[0019] Figure 5 This is a schematic diagram of the baffle structure of an embodiment of the present utility model.

[0020] In the figure: 1. Base; 2. Calibration plate body; 3. Support rod; 4. Clamp; 5. First spring; 7. Baffle; 8. First support plate; 9. Support arm; 10. Second support plate; 11. Calibration clamp; 12. Third support plate; 13. Cylinder; 14. Fourth support plate; 15. First support column; 16. Second spring; 17. Placement seat; 18. Feature point. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Example 1

[0023] like Figure 1-5As shown, a calibration plate for a telecentric lens that is easy to calibrate includes a base 1 and a calibration plate body 2. Grooves are provided on both sides of the outer surface of the calibration plate body 2. A support rod 3 is fixedly connected to one side of the inner surface of the calibration plate body 2. A clamping plate 4 is slidably connected to one side of the outer surface of the support rod 3. A first spring 5 is fixedly connected to one side of the outer surface of the support rod 3.

[0024] In this embodiment, the clamping plates 4 are provided on both sides of the first spring 5 , and a baffle 7 is provided on the other side of the outer surface of the calibration plate body 2 .

[0025] During specific use, when the user needs to use the calibration plate body 2 for lens calibration, he picks up the calibration plate body 2 with the side of the card plate 4 and docks it with the inside of the baffle 7 of the other calibration plate body 2. When the two calibration plate bodies 2 form a docking misalignment, slide the calibration plate body 2 with the side of the card plate 4 upward to make the baffle 7 limit the card plate 4 from sliding through the support rod 3. Similarly, the lower baffle 7 limits the lower card plate 4 from sliding through the support rod 3. The card plates 4 on both sides can be connected with the baffle 7 through the force of the first spring 5, thereby achieving the effect of splicing the calibration plate body 2 and changing the size of the calibration plate body 2.

[0026] In this embodiment, the upper surface of the base 1 is fixedly connected to a first support plate 8, one side of the inner wall of the first support plate 8 is rotatably connected to a support arm 9, the top of the support arm 9 is fixedly connected to a second support plate 10, and one side of the outer surface of the second support plate 10 is rotatably connected to a calibration clamp 11.

[0027] During specific use, the first support plate 8 supports the support arm 9 to rotate, thereby driving the second support plate 10 to rotate, so that the calibration clamp 11 can clamp the calibration plate.

[0028] In this embodiment, a third support plate 12 is fixedly connected to one side of the upper surface of the base 1 , a cylinder 13 is rotatably connected to one side of the inner wall of the third support plate 12 , and an output end of the cylinder 13 is rotatably connected to the support arm 9 .

[0029] During specific use, the cylinder 13 is started and contracts, and the support arm 9 rotates with the first support plate 8 as the axis, and the cylinder 13 rotates with the fourth support plate 14 as the axis, thereby achieving the effect of power transmission.

[0030] In this embodiment, a fourth support plate 14 is fixedly connected to one side of the upper surface of the base 1 , a groove is formed on one side of the inner surface of the fourth support plate 14 , and a first support column 15 is fixedly connected to one side of the inner surface of the fourth support plate 14 .

[0031] During specific use, the overall stability is enhanced by the fixed connection of the fourth support plate 14. The presence of the groove helps the reliability of the first support column 15 in its installation position, ensuring that it is not easy to move or deform. The first support column 15 maintains a relatively rigid effect.

[0032] In this embodiment, a second spring 16 is fixedly connected to one side of the outer surface of the first support column 15 , and a placement seat 17 is slidably connected to one side of the outer surface of the first support column 15 .

[0033] When in use, the calibration plate is placed in the placement seat 17, and the calibration plate is pressed downward, and the placement seat 17 moves downward, thereby preventing the calibration plate from being moved.

[0034] In this embodiment, a characteristic point 18 is provided on one side of the outer surface of the calibration plate body 2 .

[0035] During specific use, by designing characteristic points 18 on the calibration plate, it is convenient to fix the calibration plate body 2 at a specific position, ensuring that it is not easy to move during shooting, thereby improving the purpose of reproducibility.

[0036] Working principle: During use, the user ensures that the required telecentric lens and camera system have been correctly installed, selects an appropriate calibration plate, common ones include checkerboard calibration plates, dot calibration plates, etc., places the calibration plate on the placement seat 17, presses the calibration plate downward, the placement seat 17 moves downward, starts the cylinder 13, the cylinder 13 contracts, and the support arm 9 rotates with the first support plate 8 as the axis, and the cylinder 13 rotates with the fourth support plate 14 as the axis, driving the calibration clamp 11 to clamp the calibration plate to prevent the calibration plate from positional offset, performs image acquisition post-processing calculations, completes the result verification, and after the calibration is completed, moves forward through the output end of the cylinder 13 to open the calibration clamp 11 and the placement seat 17 through the second spring The reaction force of the spring 16 causes the placement seat 17 to move upward, driving the calibration plate to move upward, so that it is easy to pick up. It is used to expand the measurement range by changing the size of the calibration plate body 2. By picking up the calibration plate body 2, the side with the card plate 4 is docked with the baffle 7 of the other calibration plate body 2. When the two calibration plate bodies 2 form a docking misalignment, the calibration plate body 2 with the card plate 4 on the side is slid upward to make the baffle 7 limit the card plate 4 from sliding through the support rod 3. Similarly, the lower baffle 7 limits the lower card plate 4 from sliding through the support rod 3. The card plates 4 on both sides can be connected with the baffle 7 through the force of the first spring 5, so as to achieve the splicing of the calibration plate body 2, change the size of the calibration plate body 2, and complete the calibration of the lens.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A calibration plate for a telecentric lens that is easy to calibrate, comprising a base (1) and a calibration plate body (2), characterized in that: Grooves are provided on both sides of the outer surface of the calibration plate body (2); a support rod (3) is fixedly connected to one side of the inner surface of the calibration plate body (2); a clamping plate (4) is slidably connected to one side of the outer surface of the support rod (3); a first spring (5) is fixedly connected to one side of the outer surface of the support rod (3); the clamping plate (4) is arranged on both sides of the first spring (5); and a baffle (7) is provided on the other side of the outer surface of the calibration plate body (2).

2. The calibration plate for a telecentric lens that is easy to calibrate according to claim 1, characterized in that: A first support plate (8) is fixedly connected to the upper surface of the base (1); a support arm (9) is rotatably connected to one side of the inner wall of the first support plate (8); a second support plate (10) is fixedly connected to the top end of the support arm (9); and a calibration clamp (11) is rotatably connected to one side of the outer surface of the second support plate (10).

3. The calibration plate for a telecentric lens that is easy to calibrate according to claim 1, characterized in that: A third support plate (12) is fixedly connected to one side of the upper surface of the base (1), a cylinder (13) is rotatably connected to one side of the inner wall of the third support plate (12), and an output end of the cylinder (13) is rotatably connected to the support arm (9).

4. The calibration plate for a telecentric lens that is easy to calibrate according to claim 1, characterized in that: A fourth support plate (14) is fixedly connected to one side of the upper surface of the base (1), a groove is provided on one side of the inner surface of the fourth support plate (14), and a first support column (15) is fixedly connected to one side of the inner surface of the fourth support plate (14).

5. The calibration plate for a telecentric lens that is easy to calibrate according to claim 4, characterized in that: One side of the outer surface of the first support column (15) is fixedly connected to a second spring (16), and one side of the outer surface of the first support column (15) is slidably connected to a placement seat (17).

6. The calibration plate for a telecentric lens that is easy to calibrate according to claim 1, characterized in that: A characteristic point (18) is provided on one side of the outer surface of the calibration plate body (2).

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