CN107607294B - industrial camera entrance pupil position detection method and system - Google Patents
industrial camera entrance pupil position detection method and system Download PDFInfo
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- CN107607294B CN107607294B CN201710828273.9A CN201710828273A CN107607294B CN 107607294 B CN107607294 B CN 107607294B CN 201710828273 A CN201710828273 A CN 201710828273A CN 107607294 B CN107607294 B CN 107607294B
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Abstract
The invention discloses an industrial camera entrance pupil position detection method and system, the method comprises aligning a camera to be detected with a vertical detection target, rotating a lens, enabling a mark line on the side to reach the imaging center of the lens, recording the current imaging field angle FOV1 of the lens, recording the coordinate X1 imaged by a symmetrical center, translating the lens of the industrial camera to be detected in the direction of a target surface of the vertical detection target, enabling the imaging position of the mark line on the side to reach the position X1, recording the distance L2 from the surface of the lens to the target surface, rotating the lens to the angle of a visual angle FOV1, vertically detecting the lens of the target translation camera, enabling the mark line on the target surface to reach the central position of the lens, recording the distance L3 from the surface of the lens to the target surface, and calculating the distance L between the entrance pupil position of the industrial camera to be detected and the front surface of the lens.
Description
Technical Field
The invention relates to the technical field of visual imaging equipment, in particular to an industrial camera entrance pupil position detection method and a industrial camera entrance pupil position detection system.
Background
The basic function of the lens is to realize beam transformation (modulation), and in a machine vision system, the lens mainly plays a role in imaging an object on a photosensitive surface of an image sensor. The quality of the lens directly affects the overall performance of the machine vision system, and the reasonable selection and installation of the lens are important links of the design of the machine vision system. The development of imaging optics and the rapid development of consumer electronics require automated inspection during product assembly, which requires many industrial cameras.
the appropriate industrial lens needs to be matched with the existing equipment to function normally, i.e. to perform industrial detection, and the industrial camera needs to be debugged before executing its function to ensure its normal operation and the detection result has a high rate of collection of information.
For example, in VR products, where the field of view (FOV) and distortion are to be tested, an industrial camera is required, and the entrance pupil position of the lens of the industrial camera matches the exit pupil position of the VR lens, so that the entrance pupil position of the lens of the industrial camera needs to be known, which is not provided by the supplier , and even if it is provided, the reference value fluctuates, and the entrance pupil position needs to be estimated through multiple position attempts, which means that a simpler, more accurate and generally applicable measurement method is needed.
In summary, how to effectively solve the technical problems that the operation of measuring the entrance pupil position is difficult when an industrial camera is used at present, and the standard is not available is a problem which needs to be solved by those skilled in the art at present.
Disclosure of Invention
In view of the above, an th object of the present invention is to provide a industrial camera entrance pupil position detecting method, which can effectively solve the technical problems that the operation of measuring the entrance pupil position of an industrial camera is difficult, the standard of is not met, and the like when the industrial camera is used at present, and a industrial camera entrance pupil position detecting system for realizing the industrial camera entrance pupil position detecting method.
In order to achieve the object , the present invention provides the following solutions:
A method for detecting the entrance pupil position of an industrial camera, comprising:
step , aligning the industrial camera to be tested with the detection target set perpendicular to the lens front distance L1, aligning the lens with the symmetric center position of on the target surface to the mark line with symmetric center, and recording the scale of the symmetric center as zero degree;
rotating the lens to enable the marking line at the side to reach the position of the imaging center of the lens, recording the current imaging field angle FOV1 of the lens at the moment, and recording the coordinate X1 of the imaging position of the symmetrical center in the lens at the moment;
thirdly, translating the lens of the industrial camera to be detected in a direction vertical to the target surface of the detection target, enabling the imaging position of the marker line on the side on the target surface in the lens to reach the position of X1, and recording the distance L2 from the surface of the lens to the target surface;
rotating the lens for the second time to an angle of a visual angle FOV1, translating the lens of the industrial camera to be detected vertically to the target surface of the detection target until the marking line on the side of the target surface reaches the imaging center position of the lens, and recording the distance L3 from the surface of the lens to the target surface;
and step five, calculating and obtaining the distance L between the entrance pupil position of the industrial camera to be measured and the front surface of the lens of the industrial camera to be measured, wherein L is L3-L2.
Preferably, in the method for detecting the entrance pupil position of the industrial camera, the second step includes:
rotating the lens reversely, enabling the marking line at the other side to reach the position of the lens imaging center, recording the current imaging field angle FOV2 of the lens at the moment, and recording the coordinate X2 of the imaging position of the symmetrical center in the lens at the moment;
the third step comprises:
while the imaging position of the marking line on the target surface on the side in the lens reaches the position of X1, the imaging position of the marking line on the other side in the lens reaches the position of X2, and the distance L2' from the lens surface to the target surface is recorded;
and judging whether the values of L2 and L2' are equal, if so, acquiring the detection data, and if not, detecting again.
Preferably, in the method for detecting the entrance pupil position of the industrial camera, the fourth step includes:
rotating the lens to an angle of a visual angle FOV2, translating the lens of the industrial camera to be detected vertically to the target surface of the detection target until the marking line on the side of the target surface reaches the imaging center position of the lens, and recording the distance L3' from the surface of the lens to the target surface;
and judging whether the values of L3 and L3' are equal, if so, obtaining the detection result, and if not, detecting again.
The method for detecting the entrance pupil position of the industrial camera comprises the steps of aligning the industrial camera to be detected to a detection target which is arranged perpendicular to the front distance L1 of the lens, aligning the lens to the symmetrical center position of a mark line which is symmetrical to the center on a target surface , recording the scale of the symmetrical center as zero degree, rotating the lens to enable the mark line on the side to reach the imaging center position of the lens, recording the current imaging field angle FOV1 of the lens at the moment, recording the coordinate X1 of the imaging position of the symmetrical center in the lens at the moment, translating the lens of the industrial camera to be detected in the direction perpendicular to the target surface of the detection target to enable the imaging position of the mark line on the side in the lens on the target surface to reach the position X1, recording the distance L2 from the lens surface to the target surface at the moment, rotating the lens to the angle of the FOV1 for a second time, translating the lens of the lens to the target surface of the lens of the industrial camera to be detected perpendicular to the target surface of the target until the mark line on the target surface reaches the target surface, recording the distance L364 of the lens surface, and calculating the distance L3 from the lens to the lens surface.
The method is easy to implement, few in required auxiliary equipment is used for detecting the characteristics of each different camera, the auxiliary detection equipment can be used as a general pupil position detection mode of the camera to be detected, the distance between the pupil position of the camera to be detected and the front surface of the lens can be obtained by adjusting and observing and combining simple geometric calculation, the problem that the conventional general pupil position detection method is difficult to use when the conventional camera is used for detecting the pupil position is solved, and the like, so that the problem that the conventional general pupil position detection method is difficult to operate is solved effectively.
In order to achieve the second object, the present invention further provides an industrial camera entrance pupil position detecting system, comprising:
the six-axis rotating platform is used for fixing the industrial camera to be detected and realizing displacement and rotation of the industrial camera by adjusting the platform;
the detection target is used for detection and calibration, and is provided with linear marks with symmetrical centers and a center mark positioned at the symmetrical center of the linear marks;
and the detection rack is used for arranging the six-axis rotating platform and the detection target, so that the detection target can be perpendicular to the direction of the lens of the industrial camera to be detected.
The industrial camera entrance pupil position detection system can adopt any detection methods, and the detection system capable of realizing the detection method also has corresponding technical effects due to the technical effects of the detection method.
Preferably, the system for detecting the entrance pupil position of the industrial camera further comprises a data output module connected to the lens of the industrial camera to be detected, and configured to obtain an imaging field angle and an imaging position coordinate in the lens through lens action and imaging.
Preferably, the system for detecting the entrance pupil position of the industrial camera further comprises a data storage and recording module, configured to record and store the measurement data output by the data output module.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic flowchart of a method for detecting an entrance pupil position of an industrial camera according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of another industrial camera entrance pupil position detection methods according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an operating state of an industrial camera entrance pupil position detection system according to an embodiment of the present invention.
The drawings are numbered as follows:
a lens 1, a detection target 2, a linear mark 3, and a center mark 4.
Detailed Description
The embodiment of the invention discloses an industrial camera entrance pupil position detection method, which aims to solve the technical problems that the existing industrial camera is difficult to measure and operate the entrance pupil position, and the conventional standard does not exist.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only partial embodiments of of the present invention, rather than all embodiments.
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a method for detecting an entrance pupil position of an industrial camera according to an embodiment of the present invention;
s01, step , aim at the industrial camera to be measured at the detection target set up perpendicular to its lens forward distance L1, the lens aim at the symmetrical center position of to the symmetrical mark line of the center on the target surface, remember the scale of the said symmetrical center is zero degree;
step two of S02, rotating the lens to make the mark line on the side reach the lens imaging center position, recording the current imaging field angle FOV1 of the lens at this time, and recording the coordinate X1 of the imaging position of the symmetry center in the lens at this time;
s03, translating the lens of the industrial camera to be detected in a direction perpendicular to the target surface of the detection target, enabling the imaging position of the marker line on the side on the target surface in the lens to reach the position of X1, and recording the distance L2 between the surface of the lens and the target surface;
s04, rotating the lens for the second time to the angle of visual angle FOV1, translating the lens of the industrial camera to be detected vertically to the target surface of the detection target until the marking line on the side of the target surface reaches the imaging center position of the lens, and recording the distance L3 from the surface of the lens to the target surface;
and step five of S05, calculating and obtaining the distance L between the entrance pupil position of the industrial camera to be measured and the front surface of the lens of the industrial camera to be measured, wherein L is L3-L2.
The method is easy to implement, few in required auxiliary equipment is used for detecting the characteristics of each different camera, the auxiliary detection equipment can be used as a general pupil position detection mode of the camera to be detected, the distance between the pupil position of the camera to be detected and the front surface of the lens can be obtained by adjusting and observing and combining simple geometric calculation, the problem that the conventional general pupil position detection method is difficult to use when the conventional camera is used for detecting the pupil position is solved, and the like, so that the problem that the conventional general pupil position detection method is difficult to operate is solved effectively.
Referring to fig. 2, fig. 2 is a flowchart illustrating another industrial camera entrance pupil position detection methods according to an embodiment of the present invention.
In order to further optimize the accuracy of the measured data in the above technical solution, on the basis of the above embodiment, preferably, in the above method for detecting the entrance pupil position of the industrial camera, the second step includes:
s21, rotating the lens reversely, making the marking line on the other side reach the position of the lens imaging center, recording the current imaging field angle FOV2 of the lens at the moment, and recording the coordinate X2 of the imaging position of the symmetrical center in the lens at the moment;
the third step comprises:
s31, when the imaging position of the marker line on side in the lens reaches the position of X1 on the target surface, the imaging position of the marker line on the other side in the lens reaches the position of X2, and the distance L2' from the lens surface to the target surface is recorded;
s32 judges whether the values of L2 and L2' are equal, if yes, the detection data is received, if no, the detection is carried out again.
It should be noted that the way of determining whether the L2 and L2' data are equal is to determine whether the difference between the two data is smaller than a preset threshold, if the difference is smaller than the threshold, the two data are equal, and if the difference is larger than the threshold, the data are determined to be unequal.
In the technical scheme provided by the embodiment, the lens is rotated to side to measure group data, the lens is further rotated to side to another side, another group of reference data is measured by observing the symmetric center and the mark line of another side, the measurement principle is completely the same as that of the previous group data measurement, and the measurement of multiple groups of different mark points can ensure that the measurement data is accurate as much as possible.
To further optimize the above technical solution, on the basis of the above embodiment, preferably, in the above method for detecting an entrance pupil position of an industrial camera, the fourth step includes:
s41, reversely rotating the lens, rotating the lens to the angle of visual angle FOV2, vertically translating the lens of the industrial camera to be detected on the target surface of the detection target until the marking line on the side of the target surface reaches the imaging center position of the lens, and recording the distance L3' from the surface of the lens to the target surface;
s42, judging whether the values of L3 and L3' are equal, if yes, the detection result is obtained, and if not, the detection is carried out again. Similar to the principle of the above embodiment, a plurality of data measurements are also adopted in this step, and the accuracy of the measured data is ensured through comparison and verification.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating an operating state of an industrial camera entrance pupil position detection system according to an embodiment of the present invention.
Based on the method for detecting the entrance pupil position of the industrial camera provided in the above embodiment, the present invention further provides kinds of industrial camera entrance pupil position detecting systems, including:
the six-axis rotating platform is used for fixing the industrial camera to be detected and realizing displacement and rotation of the industrial camera by adjusting the platform;
the detection target 2 is used for detection and calibration, and is provided with a linear mark 3 with pairs of symmetrical centers and a central mark 4 positioned at the symmetrical center;
and the detection rack is used for arranging the six-axis rotating platform and the detection target 2, so that the detection target 2 can be vertical to the direction of the lens 1 of the industrial camera to be detected.
The industrial camera entrance pupil position detection system can realize the industrial camera entrance pupil position detection method in the embodiment. Since the industrial camera entrance pupil position detection system realizes the industrial camera entrance pupil position detection method in the above embodiment, please refer to the above embodiment for the beneficial effects of the industrial camera entrance pupil position detection system.
To further optimize the above technical solution, on the basis of the above embodiment, preferably, the system for detecting an entrance pupil position of an industrial camera further includes a data output module connected to the lens 1 of the industrial camera to be detected, and configured to obtain an imaging angle of view and coordinates of an imaging position in the lens 1 through the action and imaging of the lens 1.
In the technical scheme provided by the embodiment, steps of optimizing system design are added with a data output module which comprises a distance sensor and an angle sensor connected with a lens to be detected and a six-axis rotating platform, or steps of a data reading display module can be further added, so that reading display can be performed visually, the design can greatly simplify detection operation, and an operator does not need to measure the angle and the coordinate manually.
To further optimize the above technical solution, on the basis of the above embodiment, preferably, the above industrial camera entrance pupil position detecting system further includes a data storage and recording module, configured to record and store the measurement data output by the data output module.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
Claims (6)
1, industrial camera entrance pupil position detection method, characterized by, including:
step , aligning the industrial camera to be tested with the detection target set perpendicular to the lens front distance L1, aligning the lens with the symmetric center position of on the target surface to the mark line with symmetric center, and recording the scale of the symmetric center as zero degree;
rotating the lens to enable the marking line at the side to reach the position of the imaging center of the lens, recording the current imaging field angle FOV1 of the lens at the moment, and recording the coordinate X1 of the imaging position of the symmetrical center in the lens at the moment;
thirdly, translating the lens of the industrial camera to be detected in a direction vertical to the target surface of the detection target, enabling the imaging position of the marker line on the side on the target surface in the lens to reach the position of X1, and recording the distance L2 from the surface of the lens to the target surface;
rotating the lens for the second time to an angle of a visual angle FOV1, translating the lens of the industrial camera to be detected vertically to the target surface of the detection target until the marking line on the side of the target surface reaches the imaging center position of the lens, and recording the distance L3 from the surface of the lens to the target surface;
and step five, calculating and obtaining the distance L between the entrance pupil position of the industrial camera to be measured and the front surface of the lens of the industrial camera to be measured, wherein L is L3-L2.
2. The industrial camera entrance pupil position detection method according to claim 1, wherein the second step includes:
rotating the lens reversely, enabling the marking line at the other side to reach the position of the lens imaging center, recording the current imaging field angle FOV2 of the lens at the moment, and recording the coordinate X2 of the imaging position of the symmetrical center in the lens at the moment;
the third step comprises:
while the imaging position of the marking line on the target surface on the side in the lens reaches the position of X1, the imaging position of the marking line on the other side in the lens reaches the position of X2, and the distance L2' from the lens surface to the target surface is recorded;
and judging whether the values of L2 and L2' are equal, if so, acquiring the detection data, and if not, detecting again.
3. The industrial camera entrance pupil position detection method according to claim 2, wherein the fourth step includes:
rotating the lens to an angle of a visual angle FOV2, translating the lens of the industrial camera to be detected vertically to the target surface of the detection target until the marking line on the side of the target surface reaches the imaging center position of the lens, and recording the distance L3' from the surface of the lens to the target surface;
and judging whether the values of L3 and L3' are equal, if so, obtaining the detection result, and if not, detecting again.
The system for detecting entrance pupil position of industrial camera in , wherein the method for detecting entrance pupil position of industrial camera as claimed in any of claims 1-3 comprises:
the six-axis rotating platform is used for fixing the industrial camera to be detected and realizing displacement and rotation of the industrial camera by adjusting the platform;
the detection target is used for detection and calibration, and is provided with linear marks with symmetrical centers and a center mark positioned at the symmetrical center of the linear marks;
and the detection rack is used for arranging the six-axis rotating platform and the detection target, so that the detection target can be perpendicular to the direction of the lens of the industrial camera to be detected.
5. The system for detecting the entrance pupil position of an industrial camera as claimed in claim 4, further comprising a data output module connected to the lens of the industrial camera to be detected, for obtaining the imaging angle of view and the coordinates of the imaging position in the lens through lens action and imaging.
6. The industrial camera entrance pupil position detection system of claim 5, further comprising a data storage recording module for recording and storing measurement data output by the data output module.
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| CN109253868B (en) * | 2018-10-24 | 2020-04-24 | 京东方科技集团股份有限公司 | Method and device for measuring field angle |
| CN111174732A (en) * | 2018-11-13 | 2020-05-19 | 中国科学院长春光学精密机械与物理研究所 | Method and device for detecting perpendicularity of optical axis of industrial measurement camera |
| CN109596319A (en) * | 2018-11-26 | 2019-04-09 | 歌尔股份有限公司 | The detection system and method for optics module parameter |
| CN114858053B (en) * | 2021-01-20 | 2023-03-10 | 四川大学 | Method for determining spatial coordinates of center of entrance pupil of industrial camera |
| CN114593897B (en) * | 2022-03-04 | 2023-07-14 | 杭州远方光电信息股份有限公司 | Measuring method and device of near-eye display |
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| ES2354153T3 (en) * | 2002-08-20 | 2011-03-10 | Hoya Corporation | METHOD FOR EVALUATING THE PERFORMANCE OF AN OPTICAL SYSTEM AND METHOD FOR ITS DESIGN. |
| CN1312464C (en) * | 2004-04-29 | 2007-04-25 | 上海微电子装备有限公司 | Field measurement method for aberration of imaging optical system |
| WO2011125971A1 (en) * | 2010-04-05 | 2011-10-13 | 株式会社ニコン | Wavefront aberration measuring apparatus |
| CN103292981A (en) * | 2013-05-22 | 2013-09-11 | 中国科学院上海光学精密机械研究所 | Measuring device and calibration method for optical lens distortion |
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