CN107607294A - A kind of industrial camera entrance pupil method for detecting position and system - Google Patents
A kind of industrial camera entrance pupil method for detecting position and system Download PDFInfo
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- CN107607294A CN107607294A CN201710828273.9A CN201710828273A CN107607294A CN 107607294 A CN107607294 A CN 107607294A CN 201710828273 A CN201710828273 A CN 201710828273A CN 107607294 A CN107607294 A CN 107607294A
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Abstract
The invention discloses a kind of industrial camera entrance pupil method for detecting position and system, method to include：By the detection target of camera aligned perpendicular to be measured；Rotating lens, make the mark line of side reach lens imaging center, record the current imaging viewing field angle FOV1 of camera lens, the coordinate X1 of record symmetrical centre imaging；The target surface direction of vertical detection target translates the camera lens of industrial camera to be measured, and the image space of order wherein side mark line reaches X1 position, the distance L2 on record camera lens surface to target surface；Angle by rotation of lens to visual angle FOV1, vertical detection target translate the camera lens of camera, make the mark line of the target surface side reach optical center position, record camera lens surface to target surface distance L3；Calculate the distance L of the entrance pupil position with the preceding surface of its camera lens that obtain industrial camera to be measured.This method implement easily, it is necessary to auxiliary equipment it is few, detection combines the feature of each different camera lenses, can be used as the generic way of such camera entrance pupil position detection.
Description
Technical field
The present invention relates to vision imaging apparatus technical field, is examined more specifically to a kind of industrial camera entrance pupil position
Survey method, further relate to a kind of industrial camera entrance pupil position detecting system.
Background technology
The basic function of camera lens is exactly to realize optical beam transformation (modulation), in NI Vision Builder for Automated Inspection, the main function of camera lens
Be by imageable target on the photosurface of imaging sensor.The quality of camera lens directly influences the globality of NI Vision Builder for Automated Inspection
Can, camera lens is reasonably selected and installed, is the important step of Machine Vision System Design.Growing, the consumption of image optics
The fast development of electronic product, need to realize automatic detection during assembling product, thus need many industrial cameras.
A suitable industrial lens carry out industrial detection, it is necessary to existing device of arranging in pairs or groups can just work orderly, and
Industrial camera generally requires to debug in advance before its function is performed, just can ensure that its normal work and testing result accept and believe rate compared with
It is high.Wherein, to the accurate evaluation of the entrance pupil position of camera lens it is important content in debugging, but mainly leads in industry at present
Cross trial repeatedly and incorporate experience into, determine entrance pupil position, it does not have perfect scheme and solved
For VR product lists, need to test its angle of visual field (FOV) and distortion in VR products, it is necessary to use industrial phase
Machine, at this moment industrial camera Lens Entrance Pupil position must be matched with the exit pupil positions of VR camera lenses, must thus need to know industrial phase
The position of machine Lens Entrance Pupil, and this position supplier does not provide typically, even if providing, also simply referential data has fluctuation, need to also be from
Entrance pupil position is assessed by the trial of multiple position, it is seen that it is simpler accurate to also need to, and blanket measuring method.
In summary, how to efficiently solve when using industrial camera at present to its entrance pupil position finding operating difficulties, do not have
There is the technical problem of unified standard etc., be current those skilled in the art's urgent problem.
The content of the invention
In view of this, first purpose of the invention is to provide a kind of industrial camera entrance pupil method for detecting position, the work
Industry camera entrance pupil method for detecting position, which can efficiently solve to operate its entrance pupil position finding when using industrial camera at present, to be stranded
Difficulty, the technical problem do not sought unity of standard etc., second object of the present invention, which is to provide, a kind of to be used to realize above-mentioned industrial camera
The industrial camera entrance pupil position detecting system of entrance pupil method for detecting position.
In order to reach above-mentioned first purpose, the present invention provides following technical scheme：
A kind of industrial camera entrance pupil method for detecting position, including：
Step 1, the detection target that its camera lens front distance of industrial camera aligned perpendicular to be measured L1 is set, alignment lenses target surface
The symmetrical center positions of upper a pair of centrosymmetric mark lines, the scale for remembering the symmetrical centre are zero degree；
Step 2, rotating lens, the mark line of order wherein side reach lens imaging center, recorded now
The current imaging viewing field angle FOV1 of camera lens, and record the coordinate X1 of now symmetrical centre image space in camera lens；
Step 3, the target surface direction of the vertical detection target translate the camera lens of industrial camera to be measured, made wherein one on target surface
Image space of the mark line of side in camera lens reaches X1 position, records now distance L2 of the camera lens surface to target surface；
Step 4, secondary rotating camera lens, the angle by rotation of lens to visual angle FOV1, the target surface of the vertical detection target are put down
The camera lens of industrial camera to be measured is moved, until the mark line for making the target surface side reaches lens imaging center, record is now
Distance L3 of the camera lens surface to target surface；
Step 5, calculate the distance L, L=L3-L2 of the entrance pupil position with the preceding surface of its camera lens that obtain industrial camera to be measured.
Preferably, in above-mentioned industrial camera entrance pupil method for detecting position, the step 2 includes：
Camera lens is reversely rotated, makes the mark line of opposite side reach lens imaging center, records camera lens now
Current imaging viewing field angle FOV2, and record the coordinate X2 of now symmetrical centre image space in camera lens；
The step 3 includes：
While wherein image space of the mark line of side in camera lens reaches X1 position on target surface, make on target surface
Image space of the mark line of opposite side in camera lens reaches X2 position, records now distance L2' of the camera lens surface to target surface；
Judge whether L2 is equal with L2' numerical values reciteds, if it is, detection data of winning the confidence, if it is not, then re-starting inspection
Survey.
Preferably, in above-mentioned industrial camera entrance pupil method for detecting position, the step 4 includes：
Camera lens, the angle by rotation of lens to visual angle FOV2 are reversely rotated, the vertical target surface for detecting target translates to be measured
The camera lens of industrial camera, until making the mark line of the target surface side reach lens imaging center, record now camera lens table
Distance L3' of the face to target surface；
Judge whether L3 is equal with L3' numerical values reciteds, if it is, testing result of winning the confidence, if it is not, then re-starting inspection
Survey.
This industrial camera entrance pupil method for detecting position provided by the invention, including：Step 1, by industrial camera pair to be measured
The detection target that accurate vertical its camera lens front distance L1 is set, the symmetrical centre of a pair of centrosymmetric mark lines on alignment lenses target surface
Position, the scale for remembering the symmetrical centre are zero degree；Step 2, rotating lens, the mark line of order wherein side reach mirror
Head imaging center position, records the current imaging viewing field angle FOV1 of camera lens now, and record now the symmetrical centre in mirror
The coordinate X1 of image space in head；Step 3, the target surface direction of the vertical detection target translate the camera lens of industrial camera to be measured, order
Wherein image space of the mark line of side in camera lens reaches X1 position on target surface, and now target surface is arrived on camera lens surface to record
Distance L2；Step 4, secondary rotating camera lens, the angle by rotation of lens to visual angle FOV1, the target surface of the vertical detection target are put down
The camera lens of industrial camera to be measured is moved, until the mark line for making the target surface side reaches lens imaging center, record is now
Distance L3 of the camera lens surface to target surface；Step 5, calculate the entrance pupil position and the preceding surface of its camera lens for obtaining industrial camera to be measured
Distance L, L=L3-L2.
The aided-detection device that this entrance pupil method for detecting position needs to use is related to six axle rotation platforms, to control camera lens
Freely translate or rotate in three dimensions, demarcation has pair of marks line and its detection target of Central Symmetry position；By appropriate
Placement camera lens to be measured and detection target position, each mark observed using camera to be measured on detection target, and record certain
The individual anglec of rotation and its corresponding distance, afterwards by accurately position or angular adjustment, change the observation position of camera lens, observe
It is same to record the anglec of rotation and distance with previous observation relative position clearly other mark points on target surface, it can be repeated several times examination
Test or implement observational record from different mark point groups, have verified that the accuracy of data, calculated afterwards by simple geometry
The entrance pupil position of industrial camera to be measured can be obtained, the detection method combines the different actual conditions of each camera, by adjusting,
Observation, and combination simple geometry calculating can obtain camera lens entrance pupil position to be detected and surface distance before its camera lens.Should
Method implement easily, it is necessary to auxiliary equipment it is few, detection combines the feature of each different camera lenses, can be used as such camera entrance pupil
The generic way of position detection, efficiently solves when using industrial camera at present to its entrance pupil position finding operating difficulties, does not have
There is the technical problem of unified standard etc..
In order to reach above-mentioned second purpose, present invention also offers a kind of industrial camera entrance pupil position detecting system, bag
Include：
Six axle rotation platforms, for fixing industrial camera to be detected, and by realizing industrial camera displacement to platform regulation
And rotation；
Target is detected, is demarcated for detecting, is provided with a pair of centrosymmetric wire marks, and positioned at its symmetrical centre
Centre mark；
Stand is detected, for disposing the six axles rotation platform and detection target, order detection target being capable of vertically industry to be detected
The lens direction of camera.
The industrial camera entrance pupil position detecting system being capable of any of the above-described kind of detection method.Because above-mentioned detection method has
There is above-mentioned technique effect, can realize the detecting system of the detection method should also have corresponding technique effect.
Preferably, in above-mentioned industrial camera entrance pupil position detecting system, in addition to the industrial camera camera lens to be detected
The data outputting module of connection, for acting and being imaged by camera lens, obtain image space coordinate in imaging viewing field angle and camera lens.
Preferably, in above-mentioned industrial camera entrance pupil position detecting system, in addition to data storage logging modle, for recording
Store the measurement data exported by the data outputting module.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of industrial camera entrance pupil method for detecting position provided in an embodiment of the present invention；
Fig. 2 is the schematic flow sheet of another industrial camera entrance pupil method for detecting position provided in an embodiment of the present invention；
Fig. 3 is the working state schematic representation of industrial camera entrance pupil position detecting system provided in an embodiment of the present invention.
Marked in accompanying drawing as follows：
Camera lens 1, detection target 2, wire mark 3, centre mark 4.
Embodiment
The embodiment of the invention discloses a kind of industrial camera entrance pupil method for detecting position, to solve to use industrial camera at present
When to its entrance pupil position finding operating difficulties, the technical problem do not sought unity of standard etc..
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Referring to Fig. 1, the flow that Fig. 1 is industrial camera entrance pupil method for detecting position provided in an embodiment of the present invention is illustrated
Figure；
The industrial camera entrance pupil method for detecting position that the present embodiment provides, including：S01 step 1, by industrial camera to be measured
The detection target that its camera lens front distance of aligned perpendicular L1 is set, on alignment lenses target surface a pair centrosymmetric mark lines it is symmetrical in
Heart position, the scale for remembering the symmetrical centre are zero degree；
S02 step 2, rotating lens, the mark line of order wherein side reach lens imaging center, record this
When camera lens current imaging viewing field angle FOV1, and record the coordinate X1 of now symmetrical centre image space in camera lens；
S03 step 3, the target surface direction of the vertical detection target translate the camera lens of industrial camera to be measured, made on target surface wherein
Image space of the mark line of side in camera lens reaches X1 position, records now distance L2 of the camera lens surface to target surface；
S04 step 4, secondary rotating camera lens, the angle by rotation of lens to visual angle FOV1, the target of the vertical detection target
Face translates the camera lens of industrial camera to be measured, until the mark line for making the target surface side reaches lens imaging center, record
Now distance L3 of the camera lens surface to target surface；
S05 step 5, calculate the distance L, L=L3- of the entrance pupil position with the preceding surface of its camera lens that obtain industrial camera to be measured
L2。
The aided-detection device that this entrance pupil method for detecting position needs to use is related to six axle rotation platforms, to control camera lens
Freely translate or rotate in three dimensions, demarcation has pair of marks line and its detection target of Central Symmetry position；By appropriate
Placement camera lens to be measured and detection target position, each mark observed using camera to be measured on detection target, and record certain
The individual anglec of rotation and its corresponding distance, afterwards by accurately position or angular adjustment, change the observation position of camera lens, observe
It is same to record the anglec of rotation and distance with previous observation relative position clearly other mark points on target surface, it can be repeated several times examination
Test or implement observational record from different mark point groups, have verified that the accuracy of data, calculated afterwards by simple geometry
The entrance pupil position of industrial camera to be measured can be obtained, the detection method combines the different actual conditions of each camera, by adjusting,
Observation, and combination simple geometry calculating can obtain camera lens entrance pupil position to be detected and surface distance before its camera lens.Should
Method implement easily, it is necessary to auxiliary equipment it is few, detection combines the feature of each different camera lenses, can be used as such camera entrance pupil
The generic way of position detection, efficiently solves when using industrial camera at present to its entrance pupil position finding operating difficulties, does not have
There is the technical problem of unified standard etc..
Fig. 2 is refer to, Fig. 2 is the flow of another industrial camera entrance pupil method for detecting position provided in an embodiment of the present invention
Schematic diagram.
It is preferred on the basis of above-described embodiment for the accuracy of measurement data in further optimization above-mentioned technical proposal
Ground, in above-mentioned industrial camera entrance pupil method for detecting position, the step 2 includes：
S21 reversely rotates camera lens, makes the mark line of opposite side reach lens imaging center, records mirror now
The current imaging viewing field angle FOV2 of head, and record the coordinate X2 of now symmetrical centre image space in camera lens；
The step 3 includes：
S31 makes target while wherein image space of the mark line of side in camera lens reaches X1 position on target surface
Image space of the mark line of opposite side in camera lens reaches X2 position on face, records now distance of the camera lens surface to target surface
L2'；
S32 judges whether L2 is equal with L2' numerical values reciteds, if it is, detection data of winning the confidence, if it is not, then entering again
Row detection.
Wherein it should be noted that judging the L2 modes whether equal with L2' data to judge whether the difference of the two is small
In default threshold value, judge that the two is equal if difference is less than threshold value, as difference is more than the threshold value, then decision content data not phase
Deng.
In the technical scheme that the present embodiment provides, camera lens is not only rotated into one group of data of measure to side, further also
Camera lens is rotated to opposite side, the mark line by observing symmetrical centre and its opposite side determines another group of reference data, measure
Principle and upper group of data determination are completely the same, can ensure that measurement data is as far as possible accurate by the different multigroup measurements of mark point.
For further optimization above-mentioned technical proposal, above-mentioned industrial camera entrance pupil on the basis of above-described embodiment preferably
In method for detecting position, the step 4 includes：
S41 reversely rotates camera lens, the angle by rotation of lens to visual angle FOV2, and the target surface translation of the vertical detection target is treated
The camera lens of industrial camera is surveyed, until making the mark line of the target surface side reach lens imaging center, records now camera lens
Distance L3' of the surface to target surface；
S42 judges whether L3 is equal with L3' numerical values reciteds, if it is, testing result of winning the confidence, if it is not, then entering again
Row detection.It is similar with above-described embodiment principle, in this step also by the way of multiple DATA REASONING, verified by contrasting
Ensure the accurate of measurement data.
Fig. 3 is refer to, Fig. 3 is that the working condition of industrial camera entrance pupil position detecting system provided in an embodiment of the present invention is shown
It is intended to.
Based on the industrial camera entrance pupil method for detecting position provided in above-described embodiment, present invention also offers a kind of industry
Camera entrance pupil position detecting system, including：
Six axle rotation platforms, for fixing industrial camera to be detected, and by realizing industrial camera displacement to platform regulation
And rotation；
Target 2 is detected, is demarcated for detecting, is provided with a pair of centrosymmetric wire marks 3, and positioned at its symmetrical centre
Centre mark 4；
Stand is detected, for disposing the six axles rotation platform and detection target 2, order detection target 2 being capable of vertical work to be detected
The direction of camera lens 1 of industry camera.
The industrial camera entrance pupil position detecting system can realize the industrial camera entrance pupil position detection in above-described embodiment
Method.The industrial camera entrance pupil position detection side in above-described embodiment is realized due to the industrial camera entrance pupil position detecting system
Method, so the beneficial effect of industrial camera entrance pupil position detecting system refer to above-described embodiment.
For further optimization above-mentioned technical proposal, above-mentioned industrial camera entrance pupil on the basis of above-described embodiment preferably
In position detecting system, in addition to the data outputting module being connected with the industrial camera camera lens 1 to be detected, for passing through camera lens
1 action and imaging, obtain image space coordinate in imaging viewing field angle and camera lens 1.
In the technical scheme that the present embodiment provides, further optimize system design, add data outputting module, it includes
The distance that is connected with camera lens to be measured and six axle rotation platforms, angular transducer, or can further include data read it is outer aobvious
Module, shown intuitively to carry out reading；This is designed to the operation for greatly simplifying detection, makes operating personnel to survey manually again
Measure above-mentioned angle and coordinate.
For further optimization above-mentioned technical proposal, above-mentioned industrial camera entrance pupil on the basis of above-described embodiment preferably
In position detecting system, in addition to data storage logging modle, exported for record storage by the data outputting module
Measurement data.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (6)
- A kind of 1. industrial camera entrance pupil method for detecting position, it is characterised in that including：Step 1, the detection target that its camera lens front distance of industrial camera aligned perpendicular to be measured L1 is set, one on alignment lenses target surface To the symmetrical center positions of centrosymmetric mark line, the scale for remembering the symmetrical centre is zero degree；Step 2, rotating lens, the mark line of order wherein side reach lens imaging center, record camera lens now Current imaging viewing field angle FOV1, and record the coordinate X1 of now symmetrical centre image space in camera lens；Step 3, the target surface direction of the vertical detection target translate the camera lens of industrial camera to be measured, make on target surface wherein side Image space of the mark line in camera lens reaches X1 position, records now distance L2 of the camera lens surface to target surface；Step 4, secondary rotating camera lens, the angle by rotation of lens to visual angle FOV1, the target surface translation of the vertical detection target are treated The camera lens of industrial camera is surveyed, until making the mark line of the target surface side reach lens imaging center, records now camera lens Distance L3 of the surface to target surface；Step 5, calculate the distance L, L=L3-L2 of the entrance pupil position with the preceding surface of its camera lens that obtain industrial camera to be measured.
- 2. industrial camera entrance pupil method for detecting position according to claim 1, it is characterised in that the step 2 includes：Camera lens is reversely rotated, makes the mark line of opposite side reach lens imaging center, records working as camera lens now Preceding imaging viewing field angle FOV2, and record the coordinate X2 of now symmetrical centre image space in camera lens；The step 3 includes：While wherein image space of the mark line of side in camera lens reaches X1 position on target surface, make another on target surface Image space of the mark line of side in camera lens reaches X2 position, records now distance L2' of the camera lens surface to target surface；Judge whether L2 is equal with L2' numerical values reciteds, if it is, detection data of winning the confidence, if it is not, then re-starting detection.
- 3. industrial camera entrance pupil method for detecting position according to claim 2, it is characterised in that the step 4 includes：Camera lens, the angle by rotation of lens to visual angle FOV2 are reversely rotated, the target surface of the vertical detection target translates industry to be measured The camera lens of camera, until the mark line for making the target surface side reaches lens imaging center, record now arrive by camera lens surface The distance L3' of target surface；Judge whether L3 is equal with L3' numerical values reciteds, if it is, testing result of winning the confidence, if it is not, then re-starting detection.
- A kind of 4. industrial camera entrance pupil position detecting system, it is characterised in that including：Six axle rotation platforms, for fixing industrial camera to be detected, and by realizing industrial camera displacement and rotation to platform regulation Turn；Target is detected, is demarcated for detecting, is provided with a pair of centrosymmetric wire marks, and positioned at the center of its symmetrical centre Mark；Stand is detected, for disposing the six axles rotation platform and detection target, order detection target being capable of vertical industrial camera to be detected Lens direction.
- 5. industrial camera entrance pupil position detecting system according to claim 4, it is characterised in that also include with it is described to be checked The data outputting module of industrial camera camera lens connection is surveyed, for acting and being imaged by camera lens, obtains imaging viewing field angle and camera lens Middle image space coordinate.
- 6. industrial camera entrance pupil position detecting system according to claim 5, it is characterised in that also remember including data storage Record module, the measurement data exported for record storage by the data outputting module.
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| CN114858053A (en) * | 2021-01-20 | 2022-08-05 | 四川大学 | Method for determining spatial coordinates of entrance pupil center of industrial camera |
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