CN111609793A - Zoom cam curve precision detection system and method based on image measurement - Google Patents
Zoom cam curve precision detection system and method based on image measurement Download PDFInfo
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- CN111609793A CN111609793A CN202010291307.7A CN202010291307A CN111609793A CN 111609793 A CN111609793 A CN 111609793A CN 202010291307 A CN202010291307 A CN 202010291307A CN 111609793 A CN111609793 A CN 111609793A
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- zoom cam
- curve
- guide rail
- electric turntable
- cam
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/002—Measuring arrangements characterised by the use of optical techniques for measuring two or more coordinates
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
Abstract
The invention relates to a system and a method for detecting the curve precision of a zoom cam based on image measurement, which aim to solve the problems that the efficiency of detecting the curve precision of the zoom cam by using equipment such as a three-coordinate or height measuring instrument is very low and the measurement error is large in the prior art. The system comprises an electric turntable, a guide rail unit, a camera and an upper computer; the electric turntable is used for driving the zooming cam to rotate, the guide rail unit comprises a guide rail base, a guide rail and at least two sliding blocks, the guide rail is fixedly installed on the guide rail base and is parallel to a rotating shaft of the electric turntable, the sliding blocks are installed on the guide rail and can slide along the guide rail, guide pins are fixedly arranged on the sliding blocks and are matched with the width of a curve groove on the zooming cam, measuring points are marked on one side of each sliding block, a camera is used for carrying out continuous image acquisition on the motion track of the measuring points, the acquired images are transmitted to an upper computer, the upper computer can calculate according to the images acquired by the camera, and a detection result is obtained.
Description
Technical Field
The invention relates to an optical instrument detection system and method, in particular to a zoom cam curve precision detection system and method based on image measurement.
Background
Along with the rapid development of various aviation unmanned aerial vehicle platform technologies, the photoelectric imaging load applied to the unmanned aerial vehicle is more and more, the continuous switching of large and small view fields can be met, and the application of high-definition television load with large zooming is more and more extensive. At present, various innovative zoom optical design technologies are continuously advanced, wherein a zoom cam plays a key role in continuous zoom imaging, and a zoom imaging system with high integration and excellent image quality can be realized through curve optimization design of the zoom cam. According to the requirements of all optical spacing points of a variable-magnification group curve and a compensation group curve designed by a zoom optical system in a zooming process, the design and processing of a zoom cam are completed, but under the influence of metal material characteristics, a processing process and the like, the zoom cam can deform in the processing process or after processing, so that the curve precision of the zoom cam is reduced, and the curve precision of the zoom cam is a key factor for ensuring the optical spacing precision, so that the accurate detection of the curve precision of the processed zoom cam is a very important link for the integrated assembly of a camera system.
The conventional method for detecting the curve precision of the zoom cam is to manually measure and record a large number of optical interval points in a zoom stroke through equipment such as a three-coordinate or height measuring instrument and the like, then compare the measurement results of all the optical interval points with design values to check the curve precision of the zoom cam, and because the measurement data is more, the efficiency of detection by adopting the method is very low, the measurement equipment needs to be manually and continuously adjusted, the measurement error is larger, and the requirements of batch detection and high-precision detection cannot be met.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, the efficiency of detecting the curve precision of a zoom cam by using equipment such as a three-coordinate or height measuring instrument is very low, the measurement equipment needs to be adjusted manually and continuously, the measurement error is large, and the requirements of batch detection and high-precision detection cannot be met, and provides a system and a method for detecting the curve precision of the zoom cam based on image measurement.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a zoom cam curve precision detection system based on image measurement is characterized in that:
comprises an electric turntable, a guide rail unit, a camera and an upper computer;
the electric turntable is used for driving the zoom cam fixed on the electric turntable to rotate;
the guide rail unit comprises a guide rail base, a guide rail and at least two sliding blocks;
the guide rail is fixedly arranged on the guide rail base and is parallel to a rotating shaft of the electric turntable;
the sliding block is arranged on the guide rail and can slide along the guide rail;
a guide pin is fixedly arranged on the sliding block and is matched with the width of a curve groove on the zoom cam;
one side of the sliding block is marked with a measuring point;
the camera is used for carrying out continuous image acquisition on the motion trail of the measuring point on the sliding block and transmitting the acquired image to the upper computer;
and the upper computer is used for calculating according to the image collected by the camera and obtaining a detection result.
Further, the fit clearance of the guide pin and the width of the curve groove on the zoom cam is less than 0.01 mm.
Further, the electric turntable is provided with a mounting base used for fixing the zoom cam and adjusting the posture of the zoom cam.
A zoom cam curve precision detection method based on image measurement is characterized by comprising the following steps:
step 4, adjusting the angle of the camera to enable the optical axis of the camera to be perpendicular to the guide rail;
and 5, starting the electric turntable, simultaneously carrying out continuous image acquisition on the motion track of the measuring point on the sliding block by using the camera, and calculating by using an upper computer to obtain a detection result.
Further, the specific method for obtaining the detection result through calculation by the upper computer in the step 5 is that the upper computer automatically extracts coordinate data of each measurement point in the continuous frame image, forms a curve parameter of the zoom cam by mapping and matching the rotation angle of the electric turntable and the coordinate data of each measurement point through a time synchronization reference, and then calculates the error deviation degree of the curve parameter of the zoom cam and a design value to obtain the detection result of the curve precision of the zoom cam.
Further, the step 2 of adapting the width of the guide pin on the slider to the width of the curved groove specifically means that the fit clearance between the guide pin on the slider and the width of the curved groove is less than 0.01 mm.
Further, step 1 specifically means that the zoom cam is fixed on a mounting base of the electric turntable, and the attitude of the zoom cam is adjusted by adjusting the angle of the mounting base, so that the axis of the zoom cam coincides with the rotating shaft of the electric turntable.
Compared with the prior art, the invention has the beneficial effects that:
(1) the zoom cam curve precision detection system based on image measurement provided by the invention adopts the electric turntable to drive the zoom cam to rotate, so that the guide pin moves along the curve groove on the zoom cam and drives the slide block to move along the guide rail, the motion trail image of the measurement point on the slide block is collected by the camera and is transmitted to the upper computer for calculation to obtain the detection result, and the system has the advantages of simple structure, convenient operation and rapid and accurate data processing, can simultaneously detect the precision of a plurality of curves on one zoom cam and rapidly obtain the detection result, has higher detection efficiency, and can meet the requirements of batch detection and high-precision detection;
(2) in the zoom cam curve precision detection system based on image measurement, the number of the sliding blocks and the size of the guide pins on the sliding blocks can be selected and matched according to the number and the width of the curve grooves on the zoom cam to be detected, so that the zoom cam curve precision detection of different specifications can be met, and the universality is high;
(3) in the zoom cam curve precision detection system based on image measurement, the fit clearance between the guide pin and the width of the curve groove on the zoom cam is less than 0.01mm, and the detection precision superior to 0.01mm can be realized, so that the zoom system has better imaging effect after the camera system is integrated and assembled;
(4) according to the method for detecting the curve precision of the zoom cam based on image measurement, provided by the invention, the curve precision of the zoom cam is detected by using the detection system, and the measurement of all optical interval points can be completed only by carrying out primary reference adjustment before the system is started, so that the time and the labor are saved.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a system for detecting the accuracy of a zoom cam curve based on image measurement according to the present invention;
in the figure, 1-electric turntable, 11-mounting base, 2-guide rail unit, 21-guide rail base, 22-guide rail, 23-slide block, 24-guide pin, 25-measuring point, 3-zoom cam, 31-curved groove.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a zoom cam curve precision detection system based on image measurement, which comprises an electric turntable 1, a guide rail unit 2, a camera and an upper computer, as shown in figure 1.
The electric turntable 1 is provided with a mounting base 11 for fixing the zoom cam 3 and adjusting the posture of the zoom cam 3, and after the electric turntable 1 is started, the mounting base 11 can drive the zoom cam 3 to rotate.
The rail unit 2 comprises a rail base 21, a rail 22, at least two sliders 23.
The guide rail 22 is fixedly arranged on the guide rail base 21 and is parallel to the rotating shaft of the electric turntable 1; the slide block 23 is installed on the guide rail 22 and can slide along the guide rail 22; a guide pin 24 is fixedly arranged on the slide block 23, the guide pin 24 is matched with the width of the curve groove 31 on the zoom cam 3, and in order to improve the detection precision of the system, the fit clearance between the guide pin 24 and the width of the curve groove 31 on the zoom cam 3 is less than 0.01 mm; one side of the slide 23 is marked with a cross-shaped measuring point 25.
When the guide pin 24 is used, the guide pin 24 extends into the curved groove 31 of the zoom cam 3, and the zoom cam 3 rotates to enable the guide pin 24 to move along the curved groove 31 and drive the slide block 23 to move up and down along the guide rail 22.
The camera is used for carrying out continuous image acquisition on the motion trail of the measuring point 25 on the sliding block 23 and transmitting the acquired image to the upper computer.
The upper computer can calculate according to the image collected by the camera and obtain a detection result.
The method for detecting the curve accuracy of the zoom cam 3 by using the detection system is implemented according to the following steps:
step 4, in order to ensure that the coordinates of the measuring point 25 in the image collected by the camera are accurate, the angle of the camera is adjusted, and the optical axis of the camera is perpendicular to the guide rail 22, so that the motion track of the measuring point 25 on the sliding block 23 is perpendicular to the optical axis of the camera;
and 5, starting the electric turntable 1, enabling the guide pin 24 to move along the curve groove 31 by rotating the zoom cam 3, driving the sliding block 23 to move up and down along the guide rail 22, simultaneously carrying out continuous image acquisition on the motion track of the measuring point 25 on the sliding block 23 by using a camera, transmitting the acquired image to an upper computer, automatically extracting coordinate data of each measuring point 25 in continuous frame images by the upper computer, mapping and matching the rotation angle of the electric turntable 1 and the coordinate data of each measuring point 25 through a time synchronization reference to form curve parameters of the zoom cam 3, and then carrying out error deviation calculation on the curve parameters of the zoom cam 3 and design values to obtain a curve precision detection result of the zoom cam 3.
Claims (7)
1. A zoom cam curve precision detection system based on image measurement is characterized in that:
comprises an electric turntable (1), a guide rail unit (2), a camera and an upper computer;
the electric turntable (1) is used for driving the zoom cam (3) fixed on the electric turntable to rotate;
the guide rail unit (2) comprises a guide rail base (21), a guide rail (22) and at least two sliding blocks (23);
the guide rail (22) is fixedly arranged on the guide rail base (21) and is parallel to a rotating shaft of the electric turntable (1);
the sliding block (23) is arranged on the guide rail (22) and can slide along the guide rail (22);
a guide pin (24) is fixedly arranged on the sliding block (23), and the width of the guide pin (24) is matched with that of a curve groove (31) on the zooming cam (3);
one side of the sliding block (23) is marked with a measuring point (25);
the camera is used for carrying out continuous image acquisition on the motion track of the measuring point (25) on the sliding block (23) and transmitting the acquired image to an upper computer;
and the upper computer is used for calculating according to the image collected by the camera and obtaining a detection result.
2. The zoom cam curve accuracy detection system according to claim 1, characterized in that:
the fit clearance between the guide pin (24) and the width of the curve groove (31) on the zoom cam (3) is less than 0.01 mm.
3. The zoom cam curve accuracy detection system according to any one of claims 1 or 2, characterized in that:
the electric turntable (1) is provided with a mounting base (11) which is used for fixing the zooming cam (3) and adjusting the posture of the zooming cam (3).
4. A zoom cam curve precision detection method based on image measurement is characterized by comprising the following steps:
step 1, fixing a zoom cam (3) on an electric turntable (1), and adjusting the posture of the zoom cam (3) to enable the axis of the zoom cam to coincide with a rotating shaft of the electric turntable (1);
step 2, selecting a corresponding number of sliding blocks (23) according to the number of the curve grooves (31) on the zoom cam (3), enabling guide pins (24) on the sliding blocks (23) to be matched with the width of the curve grooves (31), and installing the sliding blocks (23) on the guide rails (22) to enable the guide pins (24) to extend into the curve grooves (31);
step 3, setting the rotating speed of the electric turntable (1) according to the requirement of the test quantity of the curve optical interval points of the zoom cam (3) and the image photographing frame frequency;
step 4, adjusting the angle of the camera to enable the optical axis of the camera to be perpendicular to the guide rail (22);
and 5, starting the electric turntable (1), simultaneously carrying out continuous image acquisition on the motion track of the measuring point (25) on the sliding block (23) by using a camera, and calculating by using an upper computer to obtain a detection result.
5. The zoom cam curve accuracy detection method according to claim 4, characterized in that:
the specific method for obtaining the detection result through calculation of the upper computer in the step 5 is that the upper computer automatically extracts coordinate data of each measuring point (25) in continuous frame images, mapping and matching are carried out on the rotation angle of the electric turntable (1) and the coordinate data of each measuring point (25) through a time synchronization reference to form curve parameters of the zoom cam (3), and then error deviation calculation is carried out on the curve parameters of the zoom cam (3) and design values to obtain the curve precision detection result of the zoom cam (3).
6. The zoom cam curve accuracy detection method according to claim 5, characterized in that:
the step 2, the width of the guide pin (24) on the sliding block (23) is matched with the width of the curved groove (31), specifically, the fit clearance between the width of the guide pin (24) on the sliding block (23) and the width of the curved groove (31) is less than 0.01 mm.
7. The zoom cam curve accuracy detection method according to any one of claims 4, 5, or 6, characterized in that:
the step 1 specifically means that the zoom cam (3) is fixed on a mounting base (11) of the electric turntable (1), and the posture of the zoom cam (3) is adjusted by adjusting the angle of the mounting base (11), so that the axis of the zoom cam (3) is overlapped with the rotating shaft of the electric turntable (1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010291307.7A CN111609793A (en) | 2020-04-14 | 2020-04-14 | Zoom cam curve precision detection system and method based on image measurement |
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| CN202010291307.7A CN111609793A (en) | 2020-04-14 | 2020-04-14 | Zoom cam curve precision detection system and method based on image measurement |
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| CN111609793A true CN111609793A (en) | 2020-09-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113655585A (en) * | 2021-07-28 | 2021-11-16 | 中国科学院西安光学精密机械研究所 | Method for adjusting and detecting zoom imaging lens |
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| JP2009151232A (en) * | 2007-12-21 | 2009-07-09 | Canon Inc | Zoom lens |
| CN106500592A (en) * | 2016-09-19 | 2017-03-15 | 北京科技大学 | A kind of roll axis locus online test method based on machine vision |
| CN109556532A (en) * | 2018-11-22 | 2019-04-02 | 中国科学院西安光学精密机械研究所 | A kind of cam curve automatic checkout system and method |
| CN109708574A (en) * | 2019-02-25 | 2019-05-03 | 河北科技大学 | Pipeline bulk measuring system |
| CN208921958U (en) * | 2018-11-09 | 2019-05-31 | 浙江天衡五维电子科技有限公司 | A kind of day blind ultraviolet type continuous zoom optical system |
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2020
- 2020-04-14 CN CN202010291307.7A patent/CN111609793A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009151232A (en) * | 2007-12-21 | 2009-07-09 | Canon Inc | Zoom lens |
| CN106500592A (en) * | 2016-09-19 | 2017-03-15 | 北京科技大学 | A kind of roll axis locus online test method based on machine vision |
| CN208921958U (en) * | 2018-11-09 | 2019-05-31 | 浙江天衡五维电子科技有限公司 | A kind of day blind ultraviolet type continuous zoom optical system |
| CN109556532A (en) * | 2018-11-22 | 2019-04-02 | 中国科学院西安光学精密机械研究所 | A kind of cam curve automatic checkout system and method |
| CN109708574A (en) * | 2019-02-25 | 2019-05-03 | 河北科技大学 | Pipeline bulk measuring system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113655585A (en) * | 2021-07-28 | 2021-11-16 | 中国科学院西安光学精密机械研究所 | Method for adjusting and detecting zoom imaging lens |
| CN113655585B (en) * | 2021-07-28 | 2022-08-05 | 中国科学院西安光学精密机械研究所 | Method for adjusting and detecting zoom imaging lens |
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Application publication date: 20200901 |