CN110320010A - A kind of camera lens MTF detecting tool and calibration method - Google Patents
A kind of camera lens MTF detecting tool and calibration method Download PDFInfo
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- CN110320010A CN110320010A CN201910605840.3A CN201910605840A CN110320010A CN 110320010 A CN110320010 A CN 110320010A CN 201910605840 A CN201910605840 A CN 201910605840A CN 110320010 A CN110320010 A CN 110320010A
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000003384 imaging method Methods 0.000 claims abstract description 13
- 239000005357 flat glass Substances 0.000 claims description 19
- 230000005540 biological transmission Effects 0.000 claims description 10
- 238000005452 bending Methods 0.000 claims description 3
- 239000012780 transparent material Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
Classifications
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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
- G01M11/0292—Testing optical properties of objectives by measuring the optical modulation transfer function
Abstract
The present invention relates to a kind of camera lens MTF detecting tool and calibration methods, camera lens MTF detecting tool includes: that object distance adjusts platform (11), the target clamping device (12) being supported on object distance adjusting platform (11), core adjusting device (13) below the target clamping device (12) and interface arrangement (14) and imaging device (15) are set；The object distance adjusts platform (11) can adjust the upper and lower position of the target clamping device (12) along the vertical direction.The oscilaltion effect that platform is adjusted by object distance may be implemented to adjust according to the camera lens that different object distances require and adjust object distance platform, with the detection of real scene shooting different object distances, be effectively applicable to big target surface 90,000,000 as number has range line camera lens MTF detection.
Description
Technical field
The present invention relates to machinery field more particularly to a kind of camera lens MTF detecting tool and calibration methods.
Background technique
As optics industry is increasingly developed, camera lens requires increasingly high-precision in production field, and the quality requirements of product are also increasingly
Strictly, client to camera lens parsing power, do not detect with the mode of eye recognition by single only limit, as industrial FA camera lens client is in resolving power
Detection gradually orientation and digitization, accuracy, has the accurate detection difficult of range line parsing power especially for industrial FA camera lens, gathers around
Have that a set of usability is high, detecting tool is easy, object distance can be adjusted accurately and detection mode accurately seems very necessary and effectively.
Summary of the invention
The purpose of the present invention is to provide a kind of camera lens MTF detecting tool and calibration method, it can be used in having range line camera lens
MTF detection.
For achieving the above object, the present invention provides a kind of camera lens MTF detecting tool, comprising: object distance adjusts platform, branch
It holds and adjusts the target clamping device on platform in the object distance, the core adjusting device below the target clamping device is set and connects
Mouth device and imaging device；
The object distance adjusts platform can adjust the upper and lower position of the target clamping device along the vertical direction.
According to an aspect of the present invention, the aligning pawl on the core adjusting device and the imaging device are separately positioned on institute
State the opposite both ends of interface arrangement；
The interface arrangement is hollow column, and one end of the imaging device and the interface arrangement is connected with each other,
The other end of the interface arrangement is provided with the mounting structure for installing camera lens to be measured.
According to an aspect of the present invention, the aligning pawl includes: the main body of structure annular in shape, and is arranged in the master
On body and along the work members of main body array setting.
According to an aspect of the present invention, the work members are bending part, and one end is mutually permanently connected with the main body,
The other end is free end；
The free end of the work members is in the same side of the main body；
The end of the free end of the work members also be additionally provided with guide frame.
According to an aspect of the present invention, it includes: driving device that the object distance, which adjusts platform, is connected with the driving device
The target supporting arrangement for connecing and being moved back and forth under the driving effect of the driving device in vertical direction.
According to an aspect of the present invention, the driving device includes: driving assembly and transmission component；
The driving component is mutually juxtaposed the opposite sides that the target supporting arrangement is arranged in, and is mutually juxtaposed described
Driving assembly is connected with the transmission component respectively.
According to an aspect of the present invention, the object distance adjusts platform further include: for identifying the target supporting arrangement
The scale rod structure of position in the vertical direction；
The setting that the scale rod structure and the driving component are mutually juxtaposed, and the scale rod structure and the target
Supporting arrangement is mutually slidably connected.
According to an aspect of the present invention, the scale rod structure be provided with it is multiple and respectively with the target supporting arrangement
Mutually it is slidably connected.
According to an aspect of the present invention, the target clamping device includes: loading plate, cover board, and is held positioned at described
Target between support plate and the cover board；
The loading plate and the cover board are respectively adopted transparent material and are made.
According to an aspect of the present invention, the core adjusting device further includes for supporting and adjusting aligning pawl position
Three-dimensional adjustment platform；
The three-dimensional adjustment platform is disposed adjacent with the interface arrangement.
According to an aspect of the present invention, the aligning pawl is in long strip, and one end and the three-dimensional adjustment platform are mutual
It is fixedly connected, the other end is located at the surface of the interface arrangement.
For achieving the above object, the present invention provides a kind of calibration method, the specific steps are as follows:
S1. the first flat glass is placed on target supporting arrangement, at the end of one end of interface arrangement setting mounting structure
Place the second flat glass in portion；
S2. collimator infrared light supply is placed on first flat glass and second flat glass is projected and connect
Receive infrared spotlight；
S3. the position of the target supporting arrangement and/or the interface arrangement is adjusted, until being imaged by collimator light source
Display shows that the received point light source accumulates a point.
According to an aspect of the present invention, two of first flat glass and the second flat glass opposite sides
The depth of parallelism between surface is less than or equal to 0.005mm.
A kind of scheme according to the present invention is acted on by the oscilaltion that object distance adjusts platform, be may be implemented according to difference
Object distance require camera lens and adjust and adjust object distance platform, with the detection of real scene shooting different object distances, be effectively applicable to big target surface 90,000,000
As number has range line camera lens MTF detection.
A kind of scheme according to the present invention by the way that driving assembly is arranged in target supporting arrangement opposite sides, and passes through
Transmission component connects driving assembly, be effectively ensured in this way driving during target supporting arrangement opposite sides balance and
It is synchronous, it ensure that present invention benchmark of target during carrying out object distance adjustment is consistent, the inclination for avoiding target is advantageous in turn
In raising detection accuracy of the invention.
A kind of scheme according to the present invention not only ensure that target supporting arrangement in vertical side by the way that scale rod structure is arranged
The accurate of position is moved up, and since scale rod structure can guarantee the position consistency that crossbeam is installed on it, to guarantee
The installation accuracy of driving assembly is advantageous, and then advantageous to the position precision of guarantee target supporting arrangement.
Detailed description of the invention
Fig. 1 schematically shows a kind of perspective view of the camera lens MTF detecting tool of embodiment according to the present invention；
Fig. 2 schematically shows a kind of front view of the camera lens MTF detecting tool of embodiment according to the present invention；
Fig. 3 schematically shows a kind of partial view of the camera lens MTF detecting tool of embodiment according to the present invention；
Fig. 4 schematically shows a kind of structure chart of the aligning pawl of embodiment according to the present invention；
Fig. 5 schematically shows a kind of calibration figure of embodiment camera lens MTF detecting tool according to the present invention.
Specific embodiment
It, below will be to embodiment in order to illustrate more clearly of embodiment of the present invention or technical solution in the prior art
Needed in attached drawing be briefly described.It should be evident that the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skills without creative efforts, can also be according to these
Attached drawing obtains other attached drawings.
When being described for embodiments of the present invention, term " longitudinal direction ", " transverse direction ", "upper", "lower", " preceding ",
" rear ", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", orientation or positional relationship expressed by "outside" are based on phase
Orientation or positional relationship shown in the drawings is closed, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore above-mentioned term cannot
It is interpreted as limitation of the present invention.
The present invention is described in detail with reference to the accompanying drawings and detailed description, embodiment cannot go to live in the household of one's in-laws on getting married one by one herein
It states, but therefore embodiments of the present invention are not defined in following implementation.
In conjunction with shown in Fig. 1, Fig. 2 and Fig. 3, a kind of embodiment according to the present invention, a kind of camera lens MTF detection of the invention
Tooling, comprising: object distance adjusts platform 11, and the target clamping device 12 being supported on object distance adjusting platform 11, setting is pressed from both sides in target
Hold the core adjusting device 13 and interface arrangement 14 and imaging device 15 of the lower section of device 12.In the present embodiment, object distance adjusts flat
Platform 11, target clamping device 12, core adjusting device 13 and interface arrangement 14 are supported on bearing support 16, in the present embodiment,
Bearing support 16 includes column 161, bottom plate 162 and top plate 163, wherein bottom plate 162 and top plate 163 be parallel to each other with column 161
It is mutually permanently connected.There are four the settings of column 161, is mutually permanently connected by column 161, bottom plate 162 and top plate 163 and constitutes length
Cube frame structure.In the present embodiment, object distance adjusts platform 11, core adjusting device 13 and the difference fixed bearing of interface arrangement 14
On bottom plate 162, object distance adjusts platform 11 can adjust the upper and lower position of target clamping device 12 along the vertical direction, i.e. target clamps
The distance between device 12 and interface arrangement 14.
As shown in Figure 1, a kind of embodiment according to the present invention, it includes: driving device 111 that object distance, which adjusts platform 11, with
The target supporting arrangement that driving device 111 is connected and moves back and forth under the driving effect of driving device 111 in vertical direction
112.In the present embodiment, driving device 111 includes: driving assembly 1111 and transmission component 1112；1111 phase of driving assembly
The driving assembly 1111 for being mutually disposed in parallel in the opposite sides of target supporting arrangement 112, and being mutually juxtaposed respectively with transmission component
1112 are connected.In the present embodiment, driving assembly 1111 is Linear drive, and one end rotates with top plate 163 and connect,
The other end and crossbeam 111a are rotatablely connected.In the present embodiment, it wears one end that driving assembly 1111 is rotatablely connected with top plate 163
Top plate 163 is crossed to be connected with transmission component 1112.In the present embodiment, transmission component 1112 can using tape handler,
Chain-drive mechanism or gear drive etc..In the present embodiment, manual and/or motor drive mechanism can be used in driving assembly 1111
It realizes, e.g., when using Manual structure, driving assembly 1111 is equipped with rotation handwheel in one end far from top plate 163, according to electricity
When motivation structure is realized, rotation handwheel can be replaced with motor drive mechanism.In the present embodiment, screw rod can be used in driving assembly 1111
Nut structure, by the way that the nut on screw rod is mutually permanently connected with target supporting arrangement 112, in rotary screw rod, on screw rod
The reciprocating motion of nut is to drive target supporting arrangement 112 to move back and forth.By being set in 112 opposite sides of target supporting arrangement
Driving assembly 1111 is set, and is connected driving assembly 1111 by transmission component 1112, driving process has been effectively ensured in this way
The balance and synchronization of middle 112 opposite sides of target supporting arrangement ensure that present invention target during carrying out object distance adjustment
Benchmark it is consistent, avoid target inclination so that be conducive to improve detection accuracy of the invention.
As shown in Figure 1, a kind of embodiment according to the present invention, object distance adjusts platform 11 further include: is used for identification target
The scale rod structure 113 of the position of supporting arrangement 112 in the vertical direction.In the present embodiment, scale rod structure 113 and drive
The setting that dynamic component 1111 is mutually juxtaposed, and scale rod structure 113 is mutually slidably connected with target supporting arrangement 112.In this reality
It applies in mode, scale rod structure 113 is provided with multiple and mutually equally spaced is mutually slidably connected with target supporting arrangement 112.
In the present embodiment, scale rod structure 113 includes scale bar and the sliding block on scale bar, the opposite both ends difference of scale bar
It is mutually permanently connected with bottom plate 162 and top plate 163.Crossbeam 111a is mutually permanently connected with scale bar, to realize to driving group
The bearing of part 1111.It not only ensure that target supporting arrangement 112 moves position in the vertical direction by the way that scale rod structure 113 is arranged
That sets is accurate, and since scale rod structure 113 can guarantee the position consistency that crossbeam 111a is installed on it, drives to guarantee
The installation accuracy of component 111 is advantageous, and then advantageous to the position precision of guarantee target supporting arrangement 112.
In the present embodiment, scale rod structure 113 is four, opposite two-by-two to interconnect with 112 phase of target supporting arrangement
It connects.Wherein, the sliding block on scale bar and target supporting arrangement 112 are connected with each other, to realize target supporting arrangement 112 along perpendicular
Histogram to it is mobile when its position in the vertical direction can be accurately obtained by sliding block.By the way that multiple scale rod structures are arranged
113, so as to which easier know whether 112 various loci of target supporting arrangement is consistent, to position precision is guaranteed, repair
Maintenance is advantageous.
Referring to figs. 1 and 2, a kind of embodiment according to the present invention, target clamping device 12 include: loading plate
121, cover board 122, and the target between loading plate 121 and cover board 122.In the present embodiment, loading plate 121 and lid
Plate 122 is respectively adopted transparent material and is made.In the present embodiment, loading plate 121 and cover board 122 are transparent, so as to
It is enough to be shown target in an intermediate position, facilitate the MTF detection for carrying out camera lens.In the present embodiment, pass through carrying
The effect of plate 121 and cover board 122 can sufficiently flatten target, ensure that the flatness of target, be conducive to the upper figure of target in this way
The boundary line of case is clear, advantageous to the detection accuracy for guaranteeing camera lens.In addition, cover board 122 is taken when needing replacing different targets
It rises, is put down after replacing target, it is convenient and efficient.
In this fact upper type, loading plate 121 can be fixedly mounted on target supporting arrangement 112, be supported in target
Through-hole is offered on device 112, loading plate 121 is mounted on the downside on target supporting arrangement 112,122 position target branch of cover board
The upside of bearing apparatus 112, it is shown in Figure 2.
Aligning pawl 131 and imaging device as shown in figure 3, a kind of embodiment according to the present invention, on core adjusting device 13
15 are separately positioned on the opposite both ends of interface arrangement 14.In the present embodiment, interface arrangement 14 is hollow column, imaging
One end of device 15 and interface arrangement 14 is connected with each other, and the other end of interface arrangement 14 is provided with the peace for installing camera lens to be measured
Assembling structure.In the present embodiment, the mounting hole for installing interface arrangement 14 is provided on bottom plate 162.Interface arrangement 14
One end with mounting structure passes through the mounting hole on bottom plate 162 and is mutually permanently connected.
In conjunction with shown in Fig. 1 and Fig. 3, a kind of embodiment according to the present invention, core adjusting device 13 further includes for supporting simultaneously
Adjust the three-dimensional adjustment platform 132 of 131 position of aligning pawl.In the present embodiment, three-dimensional adjustment platform 132 is from tri- sides XYZ
It is adjusted to the position to aligning pawl 131.In the present embodiment, three-dimensional adjustment platform 132 is adjacent with interface arrangement 14 sets
It sets.In the present embodiment, three-dimensional adjustment platform 132 can be for manually, or electronic.
According to the present invention, by using core adjusting device 13 and adjusting slider, it can be achieved that having the eyeglass and group's tune of range line
Core.
As shown in figure 4, a kind of embodiment according to the present invention, aligning pawl 131 includes: the main body of structure annular in shape
1311, and be arranged in main body 1311 and along the work members 1312 of 1311 array of main body setting.In the present embodiment, operation
Part 1312 can be set on 1311 one side of main body, also can be set on the edge of main body 1311.In the present embodiment,
Work members 1312 are bending part, and one end is mutually permanently connected with main body 1311, and the other end is free end.In present embodiment
In, work members 1312 have interconnecting piece 1312a and homework department 1312b.One end that work members 1312 are connected with main body 1311 is located at
On interconnecting piece 1312a, the free end of work members 1312 is located on homework department 1312b.In the present embodiment, interconnecting piece 1312a
Between homework department 1312b have angle, can be acute angle, right angle or obtuse angle, can according to the actual situation depending on.In this implementation
In mode, interconnecting piece 1312a and the inside edge of main body 1311 are mutually permanently connected, and the free end of work members 1312 is in main body
1311 the same side and along far from main body 1311 direction extend.In the present embodiment, the end of the free end of work members 1312
What portion (i.e. the end of homework department 1312b) was gone back is additionally provided with guide frame 1312c.Guide frame 1312c is a clinoplain.It is logical
Crossing setting guide frame 1312c facilitates aligning pawl 131 to contact with material is adjusted, and avoids the scuffing of surface of material.Simultaneously will
Guide frame 1312c is set as inclined-plane, makes it have Self-centering Action, advantageous to the clamping of material.
As shown in figure 4, in the present embodiment, aligning pawl 131 is the metalwork that a main body 1311 is in circular ring shape, main body
Array is uniform-distribution with three work members 1312 (quantity of work members 1312 may be arranged as four, five in 1311 inner ring
Perhaps more) play the role of pushing down eyeglass or group, eyeglass and group can be moved along the direction XYZ, aligning is reached
Purpose.One end is mutually permanently connected with three-dimensional adjustment platform 132, and the other end is located at the surface of interface arrangement 14.It will need
The camera lens for carrying out aligning is mounted on the mounting structure of interface position 14, is exchanged by the movement realization of three-dimensional adjustment platform 132
The adjustment of the position of whole pawl 131, while adjusting pawl 131 and aligning is carried out to the lens in camera lens.
As shown in figure 5, the present invention provides a kind of calibration method, comprising:
S1. the first flat glass is placed on target supporting arrangement, at the end of one end of interface arrangement setting mounting structure
Place the second flat glass in portion；
S2. collimator infrared light supply A is placed on the second flat glass is projected on the first flat glass and is received it is infrared
Point light source；
S3. the position of target supporting arrangement and/or interface arrangement is adjusted, until passing through collimator light source imaging display B
Show that received point light source accumulates a point.Pass through the fixation position of fine tuning adjustment target supporting arrangement and/or interface arrangement
Micrometer adjusting screw the depth of parallelism between the first flat glass and the second flat glass can be adjusted.From straight instrument infrared light supply transmitting and
After received infrared spotlight is by reflection, collimated instrument light source imaging display is shown.If two planes of reflection are substantially parallel,
The point light source that then light vertically reflects can accumulate a point.
Two surfaces of a kind of embodiment according to the present invention, the first flat glass and the second flat glass opposite sides
Between the depth of parallelism be less than or equal to 0.005mm.By above-mentioned setting, it can effectively ensure that the precision of calibration result, avoid
The error due to caused by the Plane glass surface depth of parallelism.
Above content is only the example of concrete scheme of the invention, for the equipment and structure of wherein not detailed description, is answered
When being interpreted as that the existing common apparatus in this field and universal method is taken to be practiced.
The foregoing is merely a schemes of the invention, are not intended to restrict the invention, for the technology of this field
For personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (13)
1. a kind of camera lens MTF detecting tool characterized by comprising object distance adjusts platform (11), is supported on the object distance and adjusts
Target clamping device (12) on platform (11) is arranged core adjusting device (13) below the target clamping device (12) and connects
Mouth device (14) and imaging device (15)；
The object distance adjusts platform (11) can adjust the upper and lower position of the target clamping device (12) along the vertical direction.
2. camera lens MTF detecting tool according to claim 1, which is characterized in that the aligning on the core adjusting device (13)
Pawl (131) and the imaging device (15) are separately positioned on the opposite both ends of the interface arrangement (14)；
The interface arrangement (14) is hollow column, one end phase of the imaging device (15) and the interface arrangement (14)
It connects, the other end of the interface arrangement (14) is provided with the mounting structure for installing camera lens to be measured.
3. camera lens MTF detecting tool according to claim 2, which is characterized in that the aligning pawl (131) includes: in ring
The main body (1311) of shape structure, and the operation for being arranged on the main body (1311) and being arranged along the main body (1311) array
Part (1312).
4. camera lens MTF detecting tool according to claim 3, which is characterized in that the work members (1312) are bending part,
One end is mutually permanently connected with the main body (1311), and the other end is free end；
The free end of the work members (1312) is in the same side of the main body (1311)；
The end of the free end of the work members (1312) also be additionally provided with guide frame.
5. camera lens MTF detecting tool according to any one of claims 1 to 4, which is characterized in that the object distance adjusts platform
(11) include: driving device (111), be connected with the driving device (111) and make in the driving of the driving device (111)
The target supporting arrangement (112) moved back and forth under in vertical direction.
6. camera lens MTF detecting tool according to claim 5, which is characterized in that the driving device (111) includes: to drive
Dynamic component (1111) and transmission component (1112)；
The driving component (1111) is mutually juxtaposed setting in the opposite sides of the target supporting arrangement (112), and mutually simultaneously
The driving component (1111) of column is connected with the transmission component (1112) respectively.
7. camera lens MTF detecting tool according to claim 6, which is characterized in that the object distance adjusts platform (11) and also wraps
It includes: for identifying the scale rod structure (113) of the position of the target supporting arrangement (112) in the vertical direction；
The setting that the scale rod structure (113) and the driving component (1111) are mutually juxtaposed, and the scale rod structure
(113) it is mutually slidably connected with the target supporting arrangement (112).
8. camera lens MTF detecting tool according to claim 7, which is characterized in that the scale rod structure (113) is provided with
It is multiple and be mutually slidably connected with the target supporting arrangement (112) respectively.
9. the camera lens MTF detecting tool according to claim 3 or 8, which is characterized in that target clamping device (12) packet
It includes: loading plate (121), cover board (122), and the target between the loading plate (121) and the cover board (122)；
The loading plate (121) and the cover board (122) are respectively adopted transparent material and are made.
10. according to the described in any item camera lens MTF detecting tools of claim 2 to 4, which is characterized in that the core adjusting device
(13) further include three-dimensional adjustment platform (132) for supporting and adjusting aligning pawl (131) position；
The three-dimensional adjustment platform (132) is disposed adjacent with the interface arrangement (14).
11. camera lens MTF detecting tool according to claim 10, which is characterized in that the aligning pawl (131) is in strip
Shape, one end are mutually permanently connected with the three-dimensional adjustment platform (132), the other end be located at the interface arrangement (14) just on
Side.
12. it is a kind of for calibrating the calibration method of the described in any item camera lens MTF detecting tools of claim 1 to 11, it is specific to walk
It is rapid as follows:
S1. the first flat glass is placed on target supporting arrangement (112), in one end of interface arrangement (14) setting mounting structure
End place the second flat glass；
S2. collimator infrared light supply is placed on first flat glass and second flat glass is projected and received red
Outer point light source；
S3. the position of the target supporting arrangement (112) and/or the interface arrangement (14) is adjusted, until passing through collimator light
Source imaging display shows that the received point light source accumulates a point.
13. calibration method according to claim 12, which is characterized in that first flat glass and second plane
The depth of parallelism between two surfaces of glass opposite sides is less than or equal to 0.005mm.
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| CN201910605840.3A CN110320010A (en) | 2019-07-05 | 2019-07-05 | A kind of camera lens MTF detecting tool and calibration method |
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| CN201910605840.3A CN110320010A (en) | 2019-07-05 | 2019-07-05 | A kind of camera lens MTF detecting tool and calibration method |
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