CN110426183A - A kind of system and method for testing lens field angle - Google Patents
A kind of system and method for testing lens field angle Download PDFInfo
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- CN110426183A CN110426183A CN201910662020.8A CN201910662020A CN110426183A CN 110426183 A CN110426183 A CN 110426183A CN 201910662020 A CN201910662020 A CN 201910662020A CN 110426183 A CN110426183 A CN 110426183A
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- point identification
- field angle
- camera lens
- lens
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
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Abstract
The invention discloses a kind of systems of testing lens field angle, first point identification is set to the front of screen test to be measured, and it is located at the center of the imaging obtained on image-forming module, second point identification and the contour two sides being symmetrically set in immediately ahead of camera lens of third point identification, and its line is located at forward position of first point identification relative to camera lens moving direction；When camera lens is moved to the second point identification to the first point identification direction in module and when third point identification varies to the final position for being exactly in left and right edges in imaging moving linearly, according to final position and the distance between the second point identification and third point identification line, and second point identification and third point identification line length, it determines angle of the final position respectively between the second point identification and the line of third point identification, obtains the field angle of camera lens.The present invention can effectively improve measuring accuracy, and save the testing time.The invention also discloses a kind of methods of testing lens field angle.
Description
Technical field
The present invention relates to technical field of optical, system and side more particularly, to a kind of testing lens field angle
Method.
Background technique
When testing the field angle of optical lens, the tools such as ruler and graphometer are generallyd use.But this can only be to related number
According to generally being measured, it is lower to measure precision.Especially for the camera lens of wide-angle (field angle is greater than 180 degree), need to splice survey
Amount, thus measure precision and be just more limited.
Summary of the invention
It is an object of the invention to overcome drawbacks described above of the existing technology, provide a kind of testing lens field angle is
System and method.
To achieve the above object, technical scheme is as follows:
A kind of system of testing lens field angle, comprising:
Move linearly module, and the screen test to be measured for driving it to load moves horizontally, the camera lens face moving direction
Setting；
Image-forming module, for obtaining observation imaging by the camera lens；
Mark module, including the first point identification is to third point identification, first point identification be set to the camera lens just before
Side, and be located at the center of the imaging obtained, second point identification and the third point identification it is contour be symmetrically set in it is described
Two sides immediately ahead of camera lens, and the line of second point identification and third point identification is located at first point identification relative to institute
State the forward position of camera lens moving direction；
Wherein, when the camera lens is moved to second point identification to first point identification direction and described thirdly marks
When knowledge varies to the final position for being exactly in left and right edges in the imaging, according to the final position and the second point
The length of the distance between mark and the third point identification line and second point identification and the third point identification line
Degree, determines angle of the final position respectively between second point identification and the line of the third point identification, obtains
The field angle of the camera lens.
Further, the linear movement module is an electric cylinders, and the electric cylinders are equipped with the guide rail and sliding block matched, described
Camera lens is set on the sliding block.
Further, the camera lens is loaded on the sliding block by an adjustable height fixture.
Further, scale is equipped with along moving direction on the guide rail.
Further, the image-forming module is a camera including the camera lens.
Further, the distance between second point identification and the third point identification are fixed.
Further, the mark module further includes that the first perpendicular ruler to third erects ruler, and first point identification is to thirdly
Mark is respectively arranged on the described first perpendicular ruler to third and erects on ruler.
Further, the mark module further includes two and intersects the plate that forms an angle, second point identification and
The third point identification is divided into the outer fix of two plates, and first point identification is set to two plates
On vertical intersection position.
A kind of method of testing lens field angle, uses the system of above-mentioned testing lens field angle, comprising the following steps:
The wire length and the line and the to be measured of stationary state for setting the second point identification and third point identification are shown on trial
The distance between head；
By the camera lens, obtain to the first point identification to the imaging of third point identification；
Adjustment makes first point identification in the imaging in center, with corrective lens center；
Move horizontally the camera lens to the first point identification direction, until second point identification and the third point identification
The mobile final position for being exactly in left and right edges is varied in the imaging, record the final position and the line it
Between distance；
According to Hook's law, company of the final position respectively with second point identification and the third point identification is calculated
Angle between line obtains the field angle of the camera lens.
Further, before corrective lens center, distortion correction first is carried out to the described image of acquisition.
The present invention can effectively improve measuring accuracy, and save the testing time.
Detailed description of the invention
Fig. 1 is a kind of system structure diagram of testing lens field angle of a preferred embodiment of the present invention.
Fig. 2 is a kind of Method And Principle schematic diagram of testing lens field angle of a preferred embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawing, specific embodiments of the present invention will be described in further detail.
It should be noted that in following specific embodiments, when describing embodiments of the invention in detail, in order to clear
Ground indicates structure of the invention in order to illustrate, spy does not draw to the structure in attached drawing according to general proportion, and has carried out part
Amplification, deformation and simplified processing, therefore, should be avoided in this, as limitation of the invention to understand.
In specific embodiment of the invention below, Fig. 1 and Fig. 2 are please referred to, Fig. 1 is a preferred embodiment of the present invention
A kind of system structure diagram of testing lens field angle, Fig. 2 are a kind of testing lens visual fields of a preferred embodiment of the present invention
The Method And Principle schematic diagram at angle.As shown in Figure 1, a kind of system of testing lens field angle of the invention, it may include: linear movement
Module, image-forming module, mark module (including first point identification a, the second point identification e ' and third point identification f ') etc. are several main
Structure element.
Please refer to Fig. 1.Linear movement module is used to drive the camera lens (figure omits) of the field angle to be tested loaded thereon horizontal
It is mobile.As an optional embodiment, the module that moves linearly can be an electric cylinders.The invention is not limited thereto.
By taking electric cylinders as an example, electric cylinders are equipped with linear guide 10 and form the sliding block being slidably matched between guide rail 10 (figure omits).
Camera lens is set on sliding block.
As a preferred embodiment, camera lens can be loaded on sliding block by an adjustable height fixture 11, in order to
Easily to adjust the height of camera lens, so as to be adapted with the height of the first point identification a.
Camera lens can also be fixedly mounted on sliding block in turn, and by adjusting the height of the first point identification a, with
The height of camera lens is adapted.
In order to measure between camera lens and the second point identification e ' and third point identification f ' line e ' f ' (diagram line segment e ' f ')
Vertical range can have the scale 101 of certain precision (virtually to show this below in figure on guide rail 10 along moving direction setting
Scale 101, unit are, for example, rice, can be accurate to millimeter).Meanwhile one immediately below the second point identification e ' and third point identification f '
Determine on the projected position of height, can also be arranged between two the subpoints e and f of the second point identification e ' and third point identification f '
Another scale (the lateral scale that lower section is shown in such as Fig. 2, unit is, for example, rice, can be accurate to millimeter), and make above-mentioned two
A scale keeps orthogonal.So as to intuitively understand between camera lens and the second point identification e ' and third point identification f ' line e ' f '
Vertical range and the second point identification e ' and third point identification f ' line e ' f ' length (the second point identification e ' and thirdly
Identify the distance of f ').Wherein, the distance of the second point identification e ' and third point identification f ' be can be according to itself and lens initial position
The distance between it is predetermined, i.e., the distance of the second point identification e ' and third point identification f ' be it is fixed known to.
The direction that camera lens faces its movement on guide rail 10 is configured, i.e., camera lens is arranged in face of the first point identification a.
Image-forming module is used to obtain by camera lens to the first point identification to third point identification a, e ', the observation of f ' imaging.
As an optional embodiment, image-forming module can be a camera including camera lens, by the first point identification to the
Three point identification a, e ', f ' are imaged, and can be obtained on camera for the first point identification to third point identification a, e ', the figure of f '
Picture.Thus, system of the invention can be used for testing the field angle of the camera lens configured on all kinds of cameras.
The image (imaging) for first point identification third point identification a, e ', f ' obtained on camera, in camera lens direction
It is in dynamic change when first direction point identification a is mobile.Because the second point identification e ' and third point identification f ' will constantly change
Its position in imaging, it is gradually mobile to the marginal position of two sides specifically by being located relatively at the middle part of image.
It please refers to Fig. 1 and combines with reference to Fig. 2.Mark module includes the first point identification a, the second point identification e ' and thirdly marks
Know f ' etc..Wherein, the first point identification a is set to the front of camera lens, and is located at the center of the imaging obtained, i.e. the first point identification a
Set on the position relative to optical center.It in other words, is by the first point identification a come the center of corrective lens.
Second point identification e ' and third point identification f ' is equal with the height of the first point identification a, and the second point identification e ' and
Three point identification f ' are symmetrically positioned in the front side of the first point identification a.I.e. using camera lens moving direction as reference, the first point identification a is located at the
The rearward position of two point identification e ' and third point identification f '.
When the distance between the second point identification e ' and third point identification f ' (line segment e ' f ') determine after, the first point identification a with
The distance between second point identification e ' and third point identification f ' line e ' f ' distance (or the first point identification a of diagram and second point
Identify the angle γ size between the line ae ' and the first point identification a and the line af ' of third point identification f ' of e '), that is, determining can
To support the size of the field angle ω of camera lens.Wherein, the first point identification a and the second point identification e ' and third point identification f ' line e '
Remoter (or the line ae ' and the first point identification a and thirdly of the first point identification a and the second point identification e ' of the distance between f '
The angle γ identified between the line af ' of f ' is smaller), system can support the field angle ω of the camera lens of test bigger.
When driving that the camera lens installed is mobile to the first direction point identification a on guide rail 10, the second point identification e ' and thirdly
Mark f ' will constantly change its position in imaging, by being located relatively at the middle part of image, gradually to the margin location of two sides
Set movement.
The final positions of left and right edges is exactly in when the second point identification e ' and third point identification f ' are varied in imaging
When, it can be according to final position b (b ') and the distance between the second point identification e ' and third point identification f ' line e ' f ' (i.e. figure middle line
The length of section bc) and the second point identification e ' and third point identification f ' line e ' f ' length, to determine final position b ' and the
Angle ω (θ) between the line b ' e ' and final position b ' of two point identification e ' and the line b ' f ' of third point identification f ', thus
Obtain the field angle ω of camera lens.Angle θ is equal with field angle ω in figure, i.e. angle θ is the upright projection angle of field angle ω.
Please refer to Fig. 1.As an optional embodiment, the second point identification e ' and third point identification f ' can be divided into two
On a plate 12 and 13；And two plates 12,13 are intersected into the γ that forms an angle, make the second point identification e ' and third point identification f '
It is located in the outer fix of two intersection plates 12,13, such as on the outer ledge for intersecting plate 12,13 positioned at two.
Meanwhile the first point identification a can be set on the intersection position of two plates 12,13, such as intersect plate 12,13 positioned at two
At joined inside, i.e. the first point identification a is theoretically in the intersection position shared by two plates 12,13.
First point identification is to third point identification a, e ', f ' and two intersection plate 12,13 collectively constituted mark module
Primary structure.
First point identification is to third point identification a, e ', f ' can be produced on two plates 12,13 by marking mode；Or
Person, the first point identification to third point identification a, e ', f ' can be formed on two plates 12,13 by bonding method；Alternatively, the
One point identification is to third point identification a, e ', f ' can also be using laser irradiation on two plates 12,13.Etc..I.e. first point
A is identified, the central point of the second point identification e ', third point identification f ' are respectively the point a, e ', f illustrated '.
Any suitable shape can be used in above-mentioned two plate 12,13, and the first point identification need only be guaranteed to third point identification
A, the relative position of e ', f ' on it.Wherein, the bottom edge length for illustrating two rectangular plates 12,13 can be arbitrarily
Length, but when being arranged longer by its length, precision will be higher.
As other optional embodiments, the first point identification a can also be set on a first perpendicular ruler, by second point mark
Know e ' to be set on a second perpendicular ruler, third point identification f ' is set to a third and is erected on ruler.First perpendicular ruler to third erects ruler face
Camera lens is vertically arranged, and is parallel to each other.
First point identification is to third point identification a, e ', the perpendicular ruler of f ' and first erects ruler to third and collectively constituted mark module
Primary structure.
Below by specific embodiment and attached drawing, the method for testing lens field angle of the invention is carried out specifically
It is bright.
It please refers to Fig. 2 and combines with reference to Fig. 1.A kind of method of testing lens field angle of the invention, can be used above-mentioned
The system of testing lens field angle.
As shown in Figure 1, the angle of view that angle ω is solved needed for being, is equal with angle θ.In moving lens,
When camera lens is moved to the straight line more than ef two o'clock composition, illustrate that the field angle of camera lens is greater than the wide-angle lens of 180 degree.
As shown in Fig. 2, method can comprise the following steps that
Firstly, set the second point identification e ' and third point identification f ' line e ' f ' length and line e ' f ' with it is quiet
Only the distance between the screen test to be measured of state (original state).The intersection of plate 12,13 can be intersected at two as escribed above
On indicate the first point identification a for corrective lens center, and indicate use on the marginal position for intersecting plate 12,13 at two
In the second point identification e ' and third point identification f ' of test field angle ω size.
Then, can be obtained by camera lens to the first point identification to third point identification a, e on camera ', the imaging of f '.
Then, distortion correction first can be carried out to the image of acquisition, to guarantee measurement accuracy.Phase in the industry can be used in distortion correction
The algorithm answered executes.
Then, adjustment makes the first point identification a in imaging in center, with corrective lens center.
Next, can be tested.Move horizontally camera lens slowly to the first direction point identification a, while in camera
The imaging of appearance is observed.
Left and right edges are exactly in when the second point identification e ' and third point identification f ' are varied in the imaging of camera
When within sweep of the eye, stop the movement to camera lens, and is final position b (b ') by the position mark.At this point, can be according to guide rail 10
On scale, record final position b and line ef between vertical range (or vertical range between point b ' and line segment e ' f '),
That is the distance between point b and point c, that is, length representated by figure middle conductor bc.
Later, final position b ' and the second point identification e ' line b ' e ' and final position b ' can be calculated according to Hook's law
Angle ω between third point identification f ' line b ' f ', to obtain the field angle ω of camera lens.
Field angle ω is replaced using FOV below, calculation method is specific as follows:
(1) when 180 ° of FOV <, such as camera lens is moved in Fig. 2 the b point being located at the upper side of this straight line of ef, uses
Following formula measures field angle:
Tan α=ec/bc
FOV=2 α
The angle of view measured at this time is about 90 degree.
(2) when FOV=180 °, i.e., when camera lens just rests on the c point on this straight line of ef, field angle is
180°；
(3) when 180 ° of FOV >, camera lens will be moved into the other side of this straight line of ef, such as positioned at the g point of diagram, then
Field angle is measured using following formula:
Tan β=ec/gc
FOV=360 ° -2 β
The angle of view measured at this time is about 213.4 degree.
Using above system and method for the invention, precision when testing lens field angle can be effectively improved, and save
Testing time.
Above is merely a preferred embodiment of the present invention, the protection scope that embodiment is not intended to limit the invention, therefore
It is all to change with equivalent structure made by specification and accompanying drawing content of the invention, it similarly should be included in protection of the invention
In range.
Claims (10)
1. a kind of system of testing lens field angle characterized by comprising
Move linearly module, and the screen test to be measured for driving it to load moves horizontally, the camera lens face moving direction setting；
Image-forming module, for obtaining observation imaging by the camera lens；
Mark module, including the first point identification, to third point identification, first point identification is set to the front of the camera lens, and
Positioned at the center of the imaging of acquisition, second point identification and the third point identification with first point identification is contour sets
It sets, and is symmetrically positioned in the front side of first point identification；
Wherein, when the camera lens is moved to second point identification to first point identification direction and the third point identification exists
When varying to the final position for being exactly in left and right edges in the imaging, according to the final position and second point identification
The length of the distance between described third point identification line and second point identification and the third point identification line,
It determines angle of the final position respectively between second point identification and the line of the third point identification, obtains described
The field angle of camera lens.
2. the system of testing lens field angle according to claim 1, which is characterized in that the linear movement module is one
Electric cylinders, the electric cylinders are equipped with the guide rail and sliding block matched, and the camera lens is set on the sliding block.
3. the system of testing lens field angle according to claim 2, which is characterized in that the camera lens can by a height
Mode fixture is loaded on the sliding block.
4. the system of testing lens field angle according to claim 2, which is characterized in that along moving direction on the guide rail
Equipped with scale.
5. the system of testing lens field angle according to claim 1, which is characterized in that the image-forming module is one to include
Camera including the camera lens.
6. the system of testing lens field angle according to claim 1, which is characterized in that second point identification and described
The distance between third point identification is fixed.
7. the system of testing lens field angle according to claim 1, which is characterized in that the mark module further includes
One perpendicular ruler to third erects ruler, and first point identification to third point identification is respectively arranged on the described first perpendicular ruler to third and erects on ruler.
8. the system of testing lens field angle according to claim 1, which is characterized in that the mark module further includes two
A to intersect the plate to form an angle, second point identification and the third point identification are divided into the outside of two plates
On position, first point identification is set on the vertical intersection position of two plates.
9. a kind of method of testing lens field angle, which comprises the following steps:
Set the second point identification and third point identification wire length and the line and stationary state screen test to be measured it
Between distance；
By the camera lens, obtain to the first point identification to the imaging of third point identification；
Adjustment makes first point identification in the imaging in center, with corrective lens center；
Move horizontally the camera lens to the first point identification direction, until second point identification and the third point identification are in institute
It states in imaging and varies to the mobile final position for being exactly in left and right edges, record between the final position and the line
Distance；
According to Hook's law, calculate the final position respectively with the line of second point identification and the third point identification it
Between angle, obtain the field angle of the camera lens.
10. the method for testing lens field angle according to claim 9, which is characterized in that before corrective lens center,
Distortion correction first is carried out to the described image of acquisition.
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| CN201910662020.8A CN110426183B (en) | 2019-07-22 | 2019-07-22 | System and method for testing field angle of lens |
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| CN201910662020.8A CN110426183B (en) | 2019-07-22 | 2019-07-22 | System and method for testing field angle of lens |
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| CN116519274A (en) * | 2023-06-25 | 2023-08-01 | 之江实验室 | Lens field angle testing method and testing system |
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