CN108931357A - Test target and corresponding camera lens MTF detection system and method - Google Patents
Test target and corresponding camera lens MTF detection system and method Download PDFInfo
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- CN108931357A CN108931357A CN201710364247.5A CN201710364247A CN108931357A CN 108931357 A CN108931357 A CN 108931357A CN 201710364247 A CN201710364247 A CN 201710364247A CN 108931357 A CN108931357 A CN 108931357A
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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
- G01M11/0242—Testing optical properties by measuring geometrical properties or aberrations
- G01M11/0257—Testing optical properties by measuring geometrical properties or aberrations by analyzing the image formed by the object to be tested
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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
- G01M11/0207—Details of measuring devices
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Abstract
The present invention provides a kind of test targets, including target ontology；MTF test pattern is formed on the target ontology by slit；And distortion correction pattern, it is formed on the target ontology by slit, and it is mutually staggered with the MTF test pattern, the distance between the center of the MTF test pattern and the first origin are equal to the distance between center and second origin of the distortion correction pattern, first origin is used to be aligned the optical axis of camera lens to be measured in MTF test, and second origin is used to be aligned the optical axis of camera lens to be measured in distortion correction test.The present invention also provides corresponding MTF test macro and methods.The target that Narrow slit detects the different function used needed for MTF can be integrated in one by the present invention, save cost；Can during detecting MTF by target once mounting in place, improve the convenience of operation；And it is strong to the camera lens of different EFL compatibility.
Description
Technical field
The present invention relates to optical lens detection technique fields, specifically, the present invention relates to a kind of test target and accordingly
Optical lens image detecting method and system.
Background technique
With the continuous improvement of photoelectricity testing part performance and the high speed development of computer technology, optical check camera lens is in work
It is widely applied in industry automated detection system, the requirement to lens imaging quality is also higher and higher.MTF
(Modulation Transfer Function, modulation transfer function) is the more scientific side of present analysis camera lens resolving power
Method, it has also become the important indicator of the generally acknowledged evaluation imaging system of industry.
Currently, occur both at home and abroad it is many for industrial production detection and universities and colleges, R&D institution's laboratory applications it is more
The different types of MTF tester of kind, such as the ImageMaster series of tests instrument of TROPTICS company of Germany production.Wherein,
ImageMaster Pro tester is suitable for the online MTF detection that tiny lens are produced in enormous quantities.
ImageMaster Pro tester calculates MTF information by acquisition Slit Image.To obtain Slit Image, need
One slit the target A, Fig. 1 for MTF test shows an example of slit target A.Since there are abnormal for visual field on non-axis
Become, it is also necessary to one matched with slit target A is used to calculate the distortion correction target B of distortion correction coefficient, Fig. 2 shows with
An example of the corresponding distortion correction target B of slit target A of Fig. 1.When carrying out MTF test, first in ImageMaster
Distortion correction target B is installed in Pro tester and obtains distortion correction coefficient, distortion correction target B is then removed, in corresponding position
Slit target A is installed and carries out MTF test, finally calculates all of different visual field different locations in conjunction with corresponding distortion correction coefficient
Mtf value.
It can be realized the online MTF detection of high-volume above by the scheme that acquisition Slit Image calculates MTF information, and survey
It is high, reproducible to try precision.However, the program is to complete a MTF test to need to process two targets, increase cost, and need
Target to be repeatedly installed during the test, cannot once test completion.On the other hand, in the program, distortion correction target is also
The problem of in the presence of EFL (Effective Focal Length, effective focal length) difference big camera lens cannot be compatible with.For example, for
Distortion correction target B shown in Fig. 2, when the EFL of camera lens to be measured is too small, imaging can exceed image planes, lead to distortion correction coefficient
It can not calculate, when EFL is excessive, imaging is too small, influences the precision of distortion correction.
Summary of the invention
The present invention is intended to provide a kind of MTF detection solution party of at least one above-mentioned defect that can overcome the prior art
Case.
According to an aspect of the invention, there is provided a kind of test target, including target ontology and setting are in the target
On ontology for being directed at the first origin of camera lens optical axis to be measured in MTF test, the MTF test pattern being made of slit, using
In the second origin for being directed at camera lens optical axis to be measured in distortion correction is tested and the distortion correction pattern being made of slit；It is described
The distance between the center of MTF test pattern and the first origin are equal between the center and the second origin of the distortion correction pattern
Distance；The position of the distortion correction pattern and the MTF test pattern mutually staggers.
In one embodiment, the MTF test pattern is cross slit.
In one embodiment, diesis slit is provided at the first origin position of the target ontology.
In one embodiment, the distortion correction pattern is the square box being made of slit.
In another embodiment, the distortion correction pattern is the field word frame being made of slit, wherein the field word frame
Including outline border and inside casing, the outline border and inside casing are respectively suitable for the difference camera lens to be measured with different effective focal lengths.In a reality
It applies in mode, second origin includes corresponding to second origin of the first kind at outline border center and corresponding to the second of inside casing center
The second origin of class, the distance of center to corresponding first origin of the MTF test pattern, which is equal to, corresponds to the MTF test
At a distance from the center of the outline border of the field word frame of pattern to the second origin of the first kind corresponding with the field word frame, the MTF is surveyed
The center for attempting case is also equal to the field word frame for corresponding to the MTF test pattern to the distance of corresponding first origin
At a distance from the center of inside casing to the second origin of the second class corresponding with field word frame described in this.
In one embodiment, setting is tested at least for carrying out MTF under at least two visual fields on the target ontology
Two MTF test patterns, for any visual field, the center for the MTF test pattern tested of MTF under the visual field is arrived
The distance of first origin is not equal to the center for the MTF test pattern tested of MTF under other visual fields to described the
The distance of one origin.
In one embodiment, it also sets up on the target ontology and is tested for carrying out distortion correction under at least two visual fields
At least two distortion correction test patterns any visual field is tested described abnormal for distortion correction under the visual field
Become center to second origin of correction test pattern distance be equal to it is corresponding under the visual field MTF test it is described
Distance of the center of MTF test pattern to first origin.
In one embodiment, the MTF test pattern for MTF test under same visual field has multiple, and these institutes
The central distribution of MTF test pattern is stated on the circumference using the first origin as the center of circle.
In one embodiment, second origin has multiple, and the position of each second origin mutually staggers.
In one embodiment, described at least two for carrying out distortion correction test under at least two visual fields
In distortion correction test pattern, under corresponding second origin of distortion correction test pattern and other visual fields under any visual field
Corresponding second origin of distortion correction test pattern be staggered.
In one embodiment, the distortion correction test pattern tested for distortion correction under same visual field has more
It is a, and the central distribution of these distortion correction test patterns is on the circumference using same second origin as the center of circle；Or
It is distributed in using multiple second origins of different location as on multiple circumference in the center of circle.
In one embodiment, at least two distortion tested for distortion correction under at least two different visual fields are rectified
Positive test pattern shares same second origin.
In one embodiment, the line at the center of the MTF test pattern and corresponding first origin, is parallel to correspondence
The company at the center of the distortion correction test pattern of the MTF test pattern and the second origin of the corresponding distortion correction test pattern
Line.In this way, in MTF detection process, it is only necessary to camera lens to be measured is simply translated, it can be by optical path from distortion correction test mode
It converts to MTF test mode.
According to another aspect of the present invention, a kind of camera lens MTF detection system using above-mentioned target is additionally provided, including：
Light source, test target, camera lens to be measured and the phase unit being made of multiple cameras being sequentially arranged along optical path；Wherein, described
Test target is previously described test target.
Wherein, the light source, test target and camera are fixed, and the camera lens to be measured is removable to adapt to different positions
The test needs set.
According to another aspect of the invention, a kind of camera lens MTF detection method using above-mentioned target is additionally provided, including under
Column step：
1) relative position for changing camera lens to be measured and test target makes second on camera lens optical axis alignment test target to be measured
Origin tests the picture of distortion correction pattern on target, to calculate distortion correction coefficient；
2) relative position for changing camera lens to be measured and test target makes first on camera lens optical axis alignment test target to be measured
Origin is distributed in the camera of different visual field different locations while acquiring the MTF of different visual field different locations on the test target
The picture of test pattern, in conjunction with corresponding distortion correction coefficient, measuring and calculating obtains all mtf values of different visual field different locations.
It wherein, include corresponding at least two visual fields or at least two distortion correction patterns extremely in the test target
When few two the second origins, the step 1) further includes：Successively change camera lens to be measured and test the relative position of target, makes to be measured
Camera lens optical axis is successively respectively aligned to each second origin on test target, test each visual field on target each is abnormal
Become the picture of correction pattern, to calculate the distortion correction coefficient of each distortion correction pattern under each visual field；All abnormal
After the distortion correction coefficient of change correction pattern is calculated, the step 2) is executed.
Compared with prior art, the present invention has at least one following technical effect：
1, the target that Narrow slit detects the different function used needed for MTF can be integrated in one, has been saved (about
50%) cost.
2, during detecting MTF, target can once mounting in place, be not necessarily to secondary replacement, improve the convenience of operation
Property.
3, the same target can survey EFL in a wide range of interior different camera lenses changed, and compatibility is strong.
Detailed description of the invention
Exemplary embodiment is shown in reference attached drawing.Embodiment and attached drawing disclosed herein should be considered illustrative
, and not restrictive.
Fig. 1 shows an example for the slit target A of MTF test in the prior art；
Fig. 2 shows an examples of distortion correction target B corresponding with the slit target A of Fig. 1 in the prior art；
Fig. 3 shows the provided test target for camera lens MTF detection according to an embodiment of the present invention；
Fig. 4 shows the test target for camera lens MTF detection provided according to a further embodiment of the invention；
Fig. 5 shows the test target provided by another embodiment according to the present invention for camera lens MTF detection；
Fig. 6 shows the test target provided by further embodiment according to the present invention for camera lens MTF detection；
Fig. 7 shows the test target provided by further embodiment according to the present invention for camera lens MTF detection；
Fig. 8 shows the test target provided by further embodiment according to the present invention for camera lens MTF detection；
Fig. 9 shows provided camera lens MTF detection system according to an embodiment of the present invention.
Specific embodiment
Various aspects of the reference attached drawing to the application are made more detailed description by the application in order to better understand.It answers
Understand, the only description to the illustrative embodiments of the application is described in detail in these, rather than limits the application in any way
Range.In the specification, the identical element of identical reference numbers.Stating "and/or" includes associated institute
Any and all combinations of one or more of list of items.
It should be noted that in the present specification, the first, second equal statement is only used for a feature and another feature differentiation
It comes, without indicating any restrictions to feature.Therefore, discussed below without departing substantially from teachings of the present application
First lens are also known as the second lens.
In the accompanying drawings, for ease of description, thickness, the size and shape of lens are slightly exaggerated.Specifically, attached drawing
Shown in spherical surface or aspherical shape be illustrated by way of example.That is, spherical surface or aspherical shape are not limited to attached drawing
Shown in spherical surface or aspherical shape.Attached drawing is merely illustrative and and non-critical drawn to scale.
It will also be appreciated that term " comprising ", " including ", " having ", "comprising" and/or " including ", when in this theory
In bright book use when indicate exist stated feature, entirety, step, operations, elements, and/or components, but do not exclude the presence of or
It is attached with one or more of the other feature, entirety, step, operation, component, assembly unit and/or their combination.In addition, ought be such as
When the statement of at least one of " ... " appears in after the list of listed feature, entire listed feature is modified, rather than is modified
Individual component in list.In addition, when describing presently filed embodiment, use " can with " indicate " one of the application or
Multiple embodiments ".Also, term " illustrative " is intended to refer to example or illustration.
As it is used in the present context, term " substantially ", " about " and similar term are used as the approximate term of table, and
Be not used as the term of table degree, and be intended to illustrate by by those skilled in the art will appreciate that, measured value or calculated value
In inherent variability.
Unless otherwise defined, otherwise all terms (including technical terms and scientific words) used herein all have with
The application one skilled in the art's is generally understood identical meaning.It will also be appreciated that term (such as in everyday words
Term defined in allusion quotation) it should be interpreted as having and their consistent meanings of meaning in the context of the relevant technologies, and
It will not be explained with idealization or excessively formal sense, unless clear herein so limit.
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
Fig. 3 shows the provided test target for camera lens MTF detection according to an embodiment of the present invention.In Fig. 3
Shown in embodiment, test target include target ontology and 1 diesis slit 1 being arranged on the target ontology,
For 0.5 visual field test 8 cross slits 4, for 0.7 visual field test 8 cross slits 5, for 0.5 visual field test
1 distortion correction square 2 and the 1 distortion correction square 3 tested for 0.7 visual field.
As shown in figure 3, diesis slit 1 be located at target ontology substantially centered on position, cross slit 4,5 and double ten
The equal light-permeable of word slit 1.The box shape structure that distortion correction square 2,3 is made of slit (constitutes distortion correction by slit
The surrounding box of square), form the slit light-permeable of the structure.
8 cross slits 4 for the test of 0.5 visual field are distributed in using the first origin o as first circumference in the center of circle, if its
Radius is R1 (radius for referring to the first circumference is R1), and radius R1 is the center for the cross slit 4 of 0.5 visual field test to the
The distance of one origin o.For example, the first origin o can be the central point of diesis slit.8 crosses for the test of 0.7 visual field are narrow
Seam 5 is distributed in using the first origin o as on second circumference in the center of circle, radius R2, radius R2 are ten for the test of 0.7 visual field
Distance of the center of word slit 5 to the first origin.The specific size of radius R1, R2 are determined by test visual field.
Distortion correction square 2 for the test of 0.5 visual field is located at using the second origin a6 as the center of circle, and radius is the circular arc of R1
On；Distortion correction square 3 for the test of 0.7 visual field is then located at using another the second origin b7 as the center of circle, and radius is the circle of R2
On arc.In the present embodiment, the second origin a6, the second origin b7 are not overlapped mutually, and the second origin a6 is not overlapped with the first origin o,
Second origin b7 is not also overlapped with the first origin o.
In the present embodiment, 8 crosses for 8 cross slits 4 of 0.5 visual field test and for the test of 0.7 visual field are narrow
For seam 5 for calculating the MTF of camera lens to be measured, concrete methods of realizing is as follows：
Mobile camera lens to be measured makes the camera lens optical axis (optical axis is perpendicular to target face) to be measured be directed at the first origin o, then uses
8 cross slits 4 of camera 0.5 visual field of acquisition are through 8 cross slits 5 of camera lens imaging to be measured and 0.7 visual field through to be measured
Camera lens imaging；
Distortion correction square 2 under 0.5 visual field can be used for calculating the distortion correction coefficient of 0.5 visual field.For example, by mirror to be measured
Head is mobile, makes camera lens optical axis to be measured perpendicular to target face and is directed at the second origin a6, such camera can collect the abnormal of 0.5 visual field
Become correction square 2 through camera lens imaging to be measured, and then calculates the distortion correction coefficient of 0.5 visual field；
Distortion correction square 3 is used to calculate the distortion correction coefficient of 0.7 visual field under 0.7 visual field.For example, again by camera lens to be measured
It is mobile, make camera lens optical axis to be measured perpendicular to target face and the second origin b7 of alignment, camera collect the distortion correction side of 0.7 visual field
Block 3 calculates the distortion correction coefficient of 0.7 visual field through camera lens imaging to be measured.
Also, in the present embodiment, as the center of the cross slit of MTF test pattern and the company of corresponding first origin
Line is parallel to the center of the distortion correction square of the corresponding cross slit and the company of the second origin of the corresponding distortion correction square
Line.In this way, in MTF detection process, it is only necessary to camera lens to be measured is simply translated, it can be by optical path from distortion correction test mode
It converts to MTF test mode.In addition, though being the optical axis for making camera lens to be measured by movement camera lens to be measured in the present embodiment
It is respectively aligned to from the different origins on target face, but it is understood that, in other embodiments of the invention, it can also pass through
Mobile target changes camera lens to be measured and tests the relative position of target and the optical axis for making camera lens to be measured and the difference on target face
Origin is respectively aligned to.
The present embodiment synthesizes distortion correction target in same target with the function of MTF test target, can greatly save
Cost, the convenience for improving operation simultaneously.
It may be noted that above-mentioned visual field unlimited 0.5 and 0.7 two, other visual fields can be used in other embodiments, it can also
With integrated multiple visual fields more than two；The cross slot number of each visual field also unlimited 8, as long as this multiple cross slits position
In (radius of the circumference is the radius corresponding to respective field of vision on target) on the circumference using a certain first origin as the center of circle.
In other embodiments, the corresponding distortion correction square of each visual field is not limited to 1 (such as can be multiple), distortion correction side
Block is not overlapped with cross slit.
Fig. 4 shows the test target for camera lens MTF detection provided according to a further embodiment of the invention, the survey
Test-object target includes target ontology and 1 diesis slit 1 being arranged on the target ontology, for 8 of the test of 0.5 visual field
Cross slit 4, for 0.7 visual field test 8 cross slits 5, for 0.5 visual field test 1 distortion correction field word frame 2 with
And 1 distortion correction field word frame 3 for the test of 0.7 visual field.The embodiment of the present embodiment and Fig. 3 are almost the same, and difference exists
In used the distortion correction pattern of Tian-shaped instead of the distortion correction pattern of square frame-like.The distortion correction figure of the Tian-shaped
Case is the matrix pattern frame being made of slit, including one constitute periphery big box (can be described as outline border) and internally positioned four
Small box (can be described as inside casing).Wherein outline border is suitable for the biggish camera lens to be measured of EFL, and inside casing is suitable for the lesser mirror to be measured of EFL
Head.
Since matrix pattern frame contains outline border and inside casing simultaneously, the second origin in the present embodiment is divided into two classes, respectively
Correspond to second origin at outline border center and the second origin corresponding to inside casing center.In this way, second in the present embodiment is former
The number of point increases to four.The outline border and inside casing of distortion correction field word frame 2 for the test of 0.5 visual field correspond respectively to second
Origin a6 and the second origin c8, the center for being used for the outline border of the distortion correction field word frame 2 of 0.5 visual field test are located at the second original
Point a6 is the center of circle, and radius is on the circular arc of R1, this is used for a specific inside casing of the distortion correction field word frame of 0.5 visual field test
Center is then located at using the second origin c8 as the center of circle, and radius is on the circular arc of R1.Similarly, the distortion for the test of 0.7 visual field is rectified
The outline border and inside casing of positive field word frame 3 correspond respectively to the second origin b7 and the second origin d9, this is used for the distortion of 0.7 visual field test
The center for correcting the outline border of field word frame 3 is located at using the second origin b7 as the center of circle, and radius is on the circular arc of R2, this is used for 0.7 visual field
The center of one specific inside casing of the distortion correction field word frame of test is then located at using the second origin d9 as the center of circle, and radius is the circle of R2
On arc.
It is in distortion correction test, the optical axis of camera lens to be measured is mobile, it is directed at the second origin a6,0.5 view can be collected
The picture of the outline border of the field word frame 2 of field distortion correction, to be adapted to the distortion correction of the biggish camera lens to be measured of EFL；By camera lens to be measured
Optical axis it is mobile, be directed at the second origin c8, the specific inside casing in the field word frame 2 of 0.5 visual field distortion correction can be collected
Picture, to be adapted to the distortion correction of the lesser camera lens to be measured of EFL.Similarly, the mobile alignment second of the optical axis of camera lens to be measured is former
Point b7 can collect the picture of the outline border of the field word frame 3 of 0.7 visual field distortion correction, to be adapted to the biggish camera lens to be measured of EFL
Distortion correction, the optical axis of camera lens to be measured is mobile, it is directed at the second origin d9, the field of 0.7 visual field distortion correction can be collected
The picture of the specific inside casing in word frame 3, to be adapted to the distortion correction of the lesser camera lens to be measured of EFL.
The present embodiment synthesizes distortion correction target and MTF test target, can greatly save cost and improve operation
It is convenient, while the compatibility of target can also be promoted to a greater degree, such as utilizes the synthesis target of the present embodiment, different EFL
The camera lens to be measured of size can all be tested.
Fig. 5 shows the test target provided by another embodiment according to the present invention for camera lens MTF detection, the survey
Test-object target and the target of Fig. 3 embodiment are almost the same, and difference is only that the number and corresponding second original of distortion correction square
The number of point.
In the present embodiment, the distortion correction square of 0.5 visual field altogether there are four, be located at Target Center it is upper and lower, left,
Right four direction, i.e. the distortion correction square 21 of 0.5 visual field above Target Center, 0.5 below Target Center
The distortion correction square 24 of visual field, positioned at Target Center left 0.5 visual field distortion correction square 22 and be located at target in
The distortion correction square 23 of 0.5 visual field of heart right.The distortion correction square of 0.7 visual field is located at target there are four being also total to
The upper and lower, left and right four direction (specifically repeating no more) at center.Second origin also altogether there are four, they respectively correspond it is upper and lower,
The distortion correction square of left and right four direction.0.5 visual field of the same direction and the distortion correction square of 0.7 visual field share same
A second origin.The distortion correction square of 0.5 visual field of upper and lower, left and right four direction is each located on corresponding second origin
Centered on, radius is on the circumference of R1.The distortion correction square of 0.7 visual field of upper and lower, left and right four direction be each located on
Centered on corresponding second origin, radius is on the circumference of R2.
Further, Fig. 6 shows the test provided by further embodiment according to the present invention for camera lens MTF detection
The distortion correction square of 0.5 visual field and 0.7 visual field is all increased to eight by target, the test target, they are located at,
Under, left and right, upper left, lower-left, upper right, on the direction of bottom right eight.It is similar with the embodiment of Fig. 5,0.5 visual field of the same direction and
The distortion correction square of 0.7 visual field shares same second origin.Upper and lower, left and right, upper left, lower-left, upper right, the side of bottom right eight
The distortion correction square of 0.5 upward visual field is each located on centered on corresponding second origin, and radius is on the circumference of R1.
Upper and lower, left and right, upper left, lower-left, upper right, 0.7 visual field on the direction of bottom right eight distortion correction square be each located on right
Centered on the second origin answered, radius is on the circumference of R2.The specific position of the second origin is not shown to keep attached drawing clean and tidy, in Fig. 6
It sets.
In addition, in the above-described embodiments, the distortion correction test chart that distortion correction is tested under for same visual field
When case has multiple, the central distribution of these distortion correction test patterns is in multiple second origins using different location as the more of the center of circle
On a circumference.But it should be readily apparent to one skilled in the art that in other embodiments of the invention, these distortion correction test patterns
Center can also be distributed in using same second origin as on the circumference in the center of circle.
Fig. 7 shows the test target provided by further embodiment according to the present invention for camera lens MTF detection, the survey
Test-object target is on the basis of the target of Fig. 5 embodiment, obtained from replacing distortion correction square (i.e. square box) with field word frame
Deformable body.It can refer to the hereinbefore description to Fig. 4 embodiment with the specific method that field word frame is replaced, details are not described herein again.
Fig. 8 shows the test target provided by further embodiment according to the present invention for camera lens MTF detection, the survey
Test-object target is on the basis of the target of Fig. 6 embodiment, obtained from replacing distortion correction square (i.e. square box) with field word frame
Deformable body.It can refer to the hereinbefore description to Fig. 4 embodiment with the specific method that field word frame is replaced, details are not described herein again.
Further, Fig. 9 shows provided camera lens MTF detection system according to an embodiment of the present invention, this reality
The camera lens MTF detection system for applying example includes：The light source 10 that is sequentially arranged along optical path, test target 20, camera lens to be measured 30 and
The phase unit 40 being made of multiple cameras.Wherein, light source 10 is fixed under normal conditions for irradiating test target 20.It surveys
Test-object target 20 is the test target of Fig. 3 embodiment.It is imaged after slit light transmission on target by camera lens 30 to be measured.The present embodiment
In, test target 20 is fixed under normal conditions, and the removable test needs to adapt to different location of camera lens to be measured 30.Phase
The corresponding test visual field of each camera of unit 40 is arranged, for capturing the imaging of slit.In the present embodiment, each camera is in
Umbrella distribution, each camera correspond respectively to the cross slit or diesis slit on test target.Camera usual situation
Under it is fixed.Although it is to be appreciated that being the optical axis and mark for making camera lens to be measured by movement camera lens to be measured in the present embodiment
Different origins on target surface are respectively aligned to, but it is understood that, in other embodiments of the invention, it can also fix to be measured
Camera lens is respectively aligned to the optical axis of camera lens to be measured from the different origins on target face by mobile target.
According to one embodiment of present invention, a kind of camera lens MTF detection method based on said detecting system is additionally provided,
Include the following steps：
Step 1：Mobile camera lens to be measured makes the second origin a on camera lens optical axis alignment test target to be measured, 0.5 view of acquisition
The picture of field square boxes slit, to calculate 0.5 visual field distortion correction coefficient.
Step 2：Camera lens to be measured is moved again, is made the second origin b on camera lens optical axis alignment target to be measured, is acquired 0.7 visual field
The picture of square boxes slit, to calculate 0.7 visual field distortion correction coefficient；It is noted that in other embodiments, if same view
There are multiple squares for distortion correction on field, is then similarly calculated；If there are also other visual fields (such as 0.9 visual field),
Also it similarly moves camera lens to be measured and is calculated.
Step 3：After the completion of the coefficient measuring and calculating of all distortion correction squares, mobile camera lens to be measured makes alignment lens mark to be measured
The first origin o on target, be distributed in the camera of different visual field different locations and meanwhile acquire different visual field different locations cross it is narrow
The picture of seam (is obtained) in conjunction with corresponding distortion correction coefficient by steps 1 and 2, and measuring and calculating obtains all of different visual field different locations
Mtf value, test terminate.
Hereinbefore describe a series of embodiments of the invention, it is noted that above-described embodiment is only to of the invention
The exemplary illustration of target is tested, test target of the invention is not limited to above-described embodiment.For example, cross slit can use it
The MTF test pattern being made of slit of its shape replaces, and square box and field word frame can also use other shapes of distortion correction
Pattern replaces.
Claims (18)
1. a kind of test target, including：
Target ontology；
MTF test pattern is formed on the target ontology by slit；And
Distortion correction pattern is formed on the target ontology by slit, and is mutually staggered with the MTF test pattern,
Wherein, the distance between the center of the MTF test pattern and the first origin are equal to the center of the distortion correction pattern
The distance between second origin, first origin are used to be aligned the optical axis of camera lens to be measured in MTF test, and described second is former
Put the optical axis for being directed at camera lens to be measured in distortion correction is tested.
2. test target according to claim 1, which is characterized in that setting is for carrying out at least two on the target ontology
At least two MTF test patterns that MTF is tested under a visual field, for any visual field, the institute tested for MTF under the visual field
The distance for stating center to first origin of MTF test pattern is not equal to the MTF tested for MTF under other visual fields and surveys
The center of case is attempted to the distance of first origin.
3. test target according to claim 1 or 2, which is characterized in that also set up on the target ontology for carrying out
At least two distortion correction test patterns that distortion correction is tested under at least two visual fields, for any visual field, for being somebody's turn to do
The distance of the center for the distortion correction test pattern that distortion correction is tested under visual field to second origin is equal to corresponding
For under the visual field MTF test the MTF test pattern center to first origin distance.
4. test target according to claim 3, which is characterized in that surveyed for the MTF tested of MTF under same visual field
Attempting case has multiple, and the central distribution of these MTF test patterns is on the circumference using the first origin as the center of circle.
5. test target according to claim 3, which is characterized in that second origin have it is multiple, and each described
The position of two origins mutually staggers.
6. test target according to claim 5, which is characterized in that described is used to carry out to distort under at least two visual fields
In at least two distortion correction test patterns for correcting test, the distortion correction test pattern under any visual field is corresponding
The second origin the second origin corresponding with the distortion correction test pattern under other visual fields be staggered.
7. test target according to claim 5, which is characterized in that for described in distortion correction test under same visual field
Distortion correction test pattern has multiple, and the central distribution of these distortion correction test patterns is with same second origin
For on the circumference in the center of circle；Or it is distributed in using multiple second origins of different location as on multiple circumference in the center of circle.
8. test target according to claim 3, which is characterized in that surveyed for distortion correction under at least two different visual fields
At least two distortion correction test patterns of examination share same second origin.
9. according to test target described in any one of claim 1,2,4 to 8, which is characterized in that in the MTF test pattern
The heart be parallel to the line of corresponding first origin the center of the distortion correction test pattern corresponding to the MTF test pattern with it is right
Should distortion correction test pattern the second origin line.
10. according to claim 1, test target described in any one of 2,4 to 8, which is characterized in that the MTF test pattern
For cross slit.
11. according to claim 1, test target described in any one of 2,4 to 8, which is characterized in that the of the target ontology
Diesis slit is provided at one origin position.
12. according to claim 1, test target described in any one of 2,4 to 8, which is characterized in that the distortion correction pattern
It is the square box being made of slit or the field word frame being made of slit.
13. test target according to claim 12, which is characterized in that the field word frame includes outline border and inside casing, described
Outline border and inside casing are respectively suitable for the difference camera lens to be measured with different effective focal lengths.
14. test target according to claim 13, which is characterized in that
Second origin includes the second origin of the first kind corresponding to outline border center and the second class corresponding to inside casing center the
Two origins,
The distance of the center of the MTF test pattern to corresponding first origin is equal to corresponding to the MTF test pattern
At a distance from the center of the outline border of the field word frame to the second origin of the first kind corresponding with the field word frame,
The distance of the center of the MTF test pattern to corresponding first origin is equal to corresponding to the MTF test pattern
At a distance from the center of the inside casing of the field word frame to the second origin of the second class corresponding with field word frame described in this.
15. a kind of camera lens MTF detection system, including：The light source that is sequentially arranged along optical path, test target, camera lens to be measured and
The phase unit being made of multiple cameras；It is characterized in that, the test target is the described in any item tests of claim 1 to 14
Target.
16. MTF detection system according to claim 15, which is characterized in that the light source, test target and camera are solid
It is fixed motionless, the removable test needs to adapt to different location of the camera lens to be measured.
17. a kind of camera lens MTF detection method based on 1 to 14 described in any item test targets, including：
1) relative position for changing camera lens to be measured and test target is directed at camera lens optical axis to be measured described on the test target
Second origin, acquires on the test target that distortion correction pattern is through camera lens imaging to be measured, to calculate distortion correction coefficient；
And
2) relative position for changing camera lens to be measured and test target is directed at camera lens optical axis to be measured described on the test target
First origin is distributed in the camera of different visual field different locations while acquiring different visual field different locations on the test target
MTF test pattern is through camera lens imaging to be measured, and in conjunction with the corresponding distortion correction coefficient, it is different that measuring and calculating obtains different visual fields
All mtf values of position.
18. according to the method for claim 17, which is characterized in that in the test target including corresponding at least two views
When at least two second origin of field or at least two distortion correction patterns, the step 1) further includes：
Successively change camera lens to be measured and test the relative position of target, camera lens optical axis to be measured is made successively to be respectively aligned to the test mark
Second origin each of on target, wherein each distortion correction pattern of each visual field on the acquisition test target
Through camera lens imaging to be measured, to calculate the distortion correction coefficient of each distortion correction pattern under each visual field.
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