CN109883653A - A kind of static tester and method of self-focusing lens optics rear cut-off distance - Google Patents
A kind of static tester and method of self-focusing lens optics rear cut-off distance Download PDFInfo
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- CN109883653A CN109883653A CN201910024337.9A CN201910024337A CN109883653A CN 109883653 A CN109883653 A CN 109883653A CN 201910024337 A CN201910024337 A CN 201910024337A CN 109883653 A CN109883653 A CN 109883653A
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Abstract
The invention discloses the static testers and method of a kind of self-focusing lens optics rear cut-off distance, wherein the static tester includes image processing system and two light path systems arranged in a crossed manner in the same plane；Light path system includes: the image capturing system connecting with image processing system, and image capturing system front is arranged in and is in the source of parallel light system on same optical axis with image capturing system；Image capturing system includes the annular light source, microcobjective and camera set gradually from front to back；Image capturing system is used to obtain the focus and rear end face information for the self-focusing lens to be detected being placed in two light path system intersectional regions, the rear cut-off distance of self-focusing lens is calculated according to the focus of self-focusing lens and the positional relationship of rear end face for handling the focus and rear end face information of acquisition for described image processing system.Static test purpose can be achieved in the present invention, can be avoided introducing kinematic error, greatly shortens the testing time.
Description
Technical field
The present invention relates to detection technique field more particularly to a kind of static testers of self-focusing lens optics rear cut-off distance
And method.
Background technique
Self-focusing lens is a kind of lens that index distribution radially converts, due to this characteristic, so that its focal length
The variation of certain rule is presented with thickness change for size.And in practice, rear cut-off distance shows more against this characteristic
Directly, so the measurement of the rear cut-off distance of self-focusing lens has a great deal of practical meanings.
The rear cut-off distance measuring technique of condenser lens also rests at present controls camera or self-focusing lens using moving component
Focusing plane is moved to is overlapped with self-focusing lens surface and focal plane respectively by sample, the opposite position of two of them interplanar
Move be exactly optic back focal away from testing length.This method needs multiple mechanically moving part, can introduce biggish kinematic error, and
Testing time is longer.
Therefore, the existing technology needs to be improved and developed.
Summary of the invention
In view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of self-focusing lens optics rear cut-off distances
Static tester and method, so that overcoming the rear cut-off distance of condenser lens in the prior art to measure needs multiple mechanically moving
Part can introduce biggish kinematic error, and testing time longer problem.
Technical scheme is as follows:
The present invention provides a kind of static tester of self-focusing lens optics rear cut-off distance, wherein including image procossing system
System and two light path systems arranged in a crossed manner in the same plane；
The light path system includes: the image capturing system connecting with image processing system, and is arranged in Image Acquisition
System front is simultaneously in the source of parallel light system on same optical axis with image capturing system；
Described image acquisition system includes the annular light source, microcobjective and camera set gradually from front to back；
Described image acquisition system is used to obtain the self-focusing to be detected being placed in two light path system intersectional regions saturating
The focus and rear end face information of mirror, described image processing system are used to handle the focus and rear end face information of acquisition, and
The rear cut-off distance of self-focusing lens is calculated according to the positional relationship of the focus of self-focusing lens and rear end face.
The static tester of the self-focusing lens optics rear cut-off distance, wherein described image acquisition system with it is parallel
The mounting base for placing self-focusing lens to be detected is additionally provided between light-source system, the mounting base is located at described two light
In the system intersectional region of road.
The static tester of the self-focusing lens optics rear cut-off distance, wherein between the microcobjective and camera
It is additionally provided with the lens barrel with microcobjective and camera target surface on same optical axis.
The static tester of the self-focusing lens optics rear cut-off distance, wherein two light path systems in 30~
60 ° of angles are arranged in a crossed manner.
The static tester of the self-focusing lens optics rear cut-off distance, wherein the source of parallel light system include from
Laser, asterism and the collimation lens set gradually front to back.
The static tester of the self-focusing lens optics rear cut-off distance, wherein subject to the focal length of the collimation lens
Distance of the straight lens to asterism.
The self-focusing lens optics rear cut-off distance based on above-described static tester that the present invention also provides a kind of it is quiet
State test method, wherein comprising steps of
Self-focusing lens to be detected is placed in described two light path system intersectional regions, open source of parallel light system and
Annular light source irradiates self-focusing lens to be detected, so that the focus and rear end face for seeing its formation clearly are understood by microcobjective, and
It is imaged on the camera target surface that each image capturing system has been demarcated in advance, corresponding image information is obtained by camera；
The focus and rear end face information of the self-focusing lens to be detected of each camera acquisition are handled and carry out three-dimensional
Reconstruct, obtains the focus of self-focusing lens and the positional relationship of rear end face, the focus and rear end face further according to self-focusing lens
The rear cut-off distance of self-focusing lens is calculated in positional relationship.
The static test of the self-focusing lens optics rear cut-off distance, wherein the method also includes steps: in advance
Camera is demarcated using scaling board.
The static test of the self-focusing lens optics rear cut-off distance, wherein it is described to each camera obtain to
Detect self-focusing lens focus and rear end face information handled and carried out three-dimensionalreconstruction, obtain self-focusing lens focus and
The step of positional relationship of rear end face, specifically includes:
The image obtained to camera pre-processes, and then carries out identification matching, the image connection for obtaining two cameras
Get up, obtain the depth information of focus and rear end face according to two matched relationships of camera, obtain self-focusing lens focus and
The relative positional relationship of rear end face.
The static test of the self-focusing lens optics rear cut-off distance, wherein the figure for obtaining two cameras
It is specifically included as the step of connecting:
It is converted by coordinate, different cameral is got up with relationship simultaneous between world coordinate system, obtain two cameras
Image connects.
The beneficial effects of the present invention are: by by the measurement problem of rear cut-off distance be converted between spatially different location away from
From problem, the focal position and rear sectional position of self-focusing lens can be obtained in the case where primary test, and then obtained
The rear cut-off distance of self-focusing lens can be avoided introducing kinematic error, when greatly shortening test to realize static test purpose
Between.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the static tester of self-focusing lens optics rear cut-off distance of the present invention.
Fig. 2 is the schematic diagram of internal structure of the source of parallel light system of the embodiment of the present invention.
Fig. 3 is that the detection device of the double light path of the embodiment of the present invention demarcates schematic diagram.
Fig. 4 is the schematic diagram of the basic principle of binocular imaging.
Fig. 5 is the schematic diagram that the depth of corresponding points is measured by the parallax that two cameras generate.
Fig. 6 is the flow chart of the static test of self-focusing lens optics rear cut-off distance of the present invention.
Fig. 7 is the process flow diagram of the image processing system of the embodiment of the present invention.
Specific embodiment
The present invention provides the static tester and method of a kind of self-focusing lens optics rear cut-off distance, to make mesh of the invention
, technical solution and effect it is clearer, clear, the present invention is described in more detail as follows in conjunction with drawings and embodiments.
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The static tester of the self-focusing lens optics rear cut-off distance of the embodiment of the present invention comprising: image processing system
With two light path systems (i.e. double beam system) arranged in a crossed manner in the same plane；The light path system includes: and schemes
As the image capturing system that processing system connects, and setting are in same in image capturing system front and with image capturing system
Source of parallel light system on one optical axis；Described image acquisition system (i.e. sampling unit) includes the annular set gradually from front to back
Light source, microcobjective and camera；Described image acquisition system is placed in two light path system intersectional regions for obtaining
The focus and rear end face information of self-focusing lens to be detected, described image processing system are used to believe the focus and rear end face of acquisition
Breath is handled, and is calculated rear section of self-focusing lens according to the focus of self-focusing lens and the positional relationship of rear end face
Away from.
Specifically, as shown in Figure 1, two light path systems are respectively as follows: the first light path system 81 and the second light path system 82.The
One light path system 81 include: the first image capturing system and setting the first image capturing system front and with the first image
Acquisition system is in the first source of parallel light system 61 on same optical axis；First image capturing system includes from front to back successively
First annular light source 51, the first microcobjective 41, first camera 21 being arranged.Second light path system 82 includes: that the second image is adopted
Collecting system and the second image capturing system front is set and is in the second image capturing system on same optical axis
Two source of parallel light systems 62；Second image capturing system includes that the second annular light source 52, second set gradually from front to back is shown
Speck mirror 42, second camera 22.Light beam, which converges on self-focusing lens 9 to be detected, respectively enters two image capturing systems, the
One image capturing system and the second image capturing system are used to obtain the focus and rear end face information of self-focusing lens 9 to be detected.
The present invention is by being converted to spatially the distance between different location problem, Ke Yi for the measurement problem of rear cut-off distance
The focal position and rear sectional position of self-focusing lens are obtained in the case where primary test, and then after obtaining self-focusing lens
Intercept can be avoided introducing kinematic error, greatly shorten the testing time to realize static test purpose.
Static tester of the present invention is generated based on binocular imaging principle described in Fig. 4 using the observation of different perspectives
Parallax calculate depth information spatially.Wherein, in Fig. 4, Ow-XwYwZw is the space coordinates of detection zone, Ocl-
XclYclZcl, Ocr-XcrYcrZcr are respectively the preceding working distance that coordinate system f ' where the camera lens of left and right camera is microlens
From it is unified standard 160mm, UlVl, UrVr are respectively left and right camera target surface that f, which is distance of the microlens to camera target surface,
The image coordinate system at place.
Further, in the present embodiment, annular light source is placed in front of microcobjective, convenient for that can see autohemagglutination well
The rear surface of focus lens sample.Two image capturing systems be respectively placed in and source of parallel light system coaxial self-focusing to be measured
After lens specimen, camera is enabled to obtain the focus that directional light generates sample to be tested, and open annular light source to obtain
The image in section after to sample to be tested.In specific application, after the visual field of microcobjective needs while seeing self-focusing surface
Section and focus need the depth of field of microcobjective that can observe the picture of this range greater than the rear cut-off distance of self-focusing lens.If
The focal plane of two image sampling systems is set before the end face of sample to be tested, so that the rear section of self-focusing lens sample is with coke
Point is all in the field depth of microcobjective.Described image processing system can use computer, may be implemented quick to image
Acquisition, processing analysis immediately obtain self-focusing rear cut-off distance and store to corresponding information.Multichannel figure may be implemented in computer
As conversion, two cameras are installed at the same end PC, can according to need before the camera shooting C mouthfuls of laser size exterior or
CS mouthfuls of microcobjective and lens barrel, camera can be industrial camera.
Preferably, it in the present embodiment, is additionally provided between described image acquisition system and source of parallel light system for placing
The mounting base of self-focusing lens to be detected, the mounting base are located in described two light path system intersectional regions.When it is implemented,
Self-focusing lens sample to be measured is placed in the mounting base in two source of parallel light system intersectional regions, and intersectional region is greater than
Otherwise sample to be tested size can cause match and cause biggish except intersectional region due to sample to be tested partial region
Error.
Further, it as shown in Figure 1, in the present embodiment, is additionally provided between the microcobjective and camera and micro- object
The lens barrel of mirror and camera target surface on same optical axis, specially the first lens barrel 31 and the second lens barrel 32.That is source of parallel light and phase
The microcobjective answered, lens barrel, camera target surface are on same optical axis.Two light path systems are set in 30~60 ° of angle intersections
It sets namely two source of parallel light systems is in 30~60 ° of angles, such as can be 30 °, 45 °, 60 °.The source of parallel light system packet
Include the laser, asterism and collimation lens set gradually from front to back.It is shown in Figure 2, the first source of parallel light system 61 packet
Include the first laser device 611 set gradually from front to back, the first asterism 612 and the first collimation lens 613.The collimation is saturating
Mirror can use achromatic cemented doublet.The focal length of the collimation lens is collimation lens to the distance of asterism, i.e. asterism
It is placed on the rear focal point of cemented doublet.
Specifically, together referring to as shown in Figure 1 and Figure 2, in the present embodiment, the optical path of each element of the first light path system 81
Order of propagation is first laser device 611, and the first asterism 612, the first collimation lens 613, self-focusing lens 9 to be measured is first annular
Light source 51, the first microcobjective 41, the first lens barrel 31, first camera 21.
Further, it is based on above-described static tester, the present embodiment also provides a kind of self-focusing lens optics
The static test of rear cut-off distance, as shown in Figure 6, which comprises
Step S200, self-focusing lens to be detected is placed in described two light path system intersectional regions, is opened parallel
Light-source system and annular light source irradiate self-focusing lens to be detected so that understand by microcobjective see clearly focus that it is formed and
Rear end face, and be imaged on the camera target surface that each image capturing system has been demarcated in advance, it is obtained by camera corresponding
Image information；
Step S300, the focus and rear end face information of the self-focusing lens to be detected obtained to each camera are handled simultaneously
Carry out three-dimensionalreconstruction, obtain the focus of self-focusing lens and the positional relationship of rear end face, further according to self-focusing lens focus and
The rear cut-off distance of self-focusing lens is calculated in the positional relationship of rear end face.
Wherein, the step of step S200 is the focus and rear end face information for recording sample, when it is implemented, sample passes through
Crossing source of parallel light will form focus, can very easily see the picture of end face thereafter clearly under the irradiation of annular light source, and utilization is micro-
What object lens can will be apparent that sees the focus to be formed and rear end face clearly, and is imaged onto camera target surface and be transferred in computer.
Further, in the present embodiment, in the step S300, the self-focusing to be detected obtained to each camera is saturating
The focus and rear end face information of mirror are handled and are carried out three-dimensionalreconstruction, obtain the focus of self-focusing lens and the position of rear end face
The step of relationship, specifically includes:
The image obtained to camera pre-processes, and then carries out identification matching, the image connection for obtaining two cameras
Get up, obtain the depth information of focus and rear end face according to two matched relationships of camera, obtain self-focusing lens focus and
The relative positional relationship of rear end face.
When it is implemented, being pre-processed in image transmitting to computer using image processing software to image, then
Carry out identification matching so that two cameras obtain image connected, it is available according to two matched relationships of camera
The depth information of focus and rear end face, so that the focus of self-focusing lens and the relative positional relationship of rear end face are obtained, and then
To the rear cut-off distance of self-focusing lens, principle is shown in Figure 7.Matching process is completed by image processing system (computer terminal),
Then the pretreatment being filtered first to acquired image carries out edge extracting to image using Canny operator, obtains pole
Have the marginal information of feature, the match point of characteristic point is then constrained in into another image using the limit restraint between different cameral
On upper corresponding polar curve, the grey scale change rule and matched succession principle of characteristic point are recycled, determines that different cameral obtains
Image match point, these matching point interpolations are connected to obtain edge, characteristic area, complete matching process.
Further, in the present embodiment, in the step S300, what the image for obtaining two cameras connected
Step specifically includes:
It is converted by coordinate, different cameral is got up with relationship simultaneous between world coordinate system, obtain two cameras
Image connects.When it is implemented, the relationship by coordinate transform joins different cameral with the relationship between world coordinate system
Erect come, can thus be obtained according to the two image relationship determine their intersectional regions difference depth information, obtain
The relative positional relationship of difference.
Have from left camera to world coordinate system:
Wherein,
Wherein, (Xw, Yw, Zw) is some coordinates in world coordinate system, (ul、vl) it is the image coordinate that left camera obtains
Correspond to the coordinate of world coordinate system specified point in system, d is the pixel dimension size of camera, u0、v0Respectively image transverse and longitudinal direction
Half namely image center, f is the focal length of camera, and Rl, Tl are world coordinate system respectively to left camera coordinates system
The angle of spin matrix and translation matrix, α 1 between camera coordinates system and world coordinate system, l ' are that world coordinate system origin arrives
The distance of camera coordinates system origin.
Have from right camera to world coordinate system:
Wherein,
Equally, (Xw, Yw, Zw) is some coordinates in world coordinate system, (ur、vr) it is the image coordinate that right camera obtains
Correspond to the coordinate of world coordinate system specified point in system, d is the pixel dimension size of camera, u0、v0Respectively image transverse and longitudinal direction
Half namely image center, f is the focal length of camera, and Rr, Tr are world coordinate system respectively to right camera coordinates system
The angle of spin matrix and translation matrix, α 2 between right camera coordinates system and world coordinate system, l ' are world coordinate system origin
To the distance of camera coordinates system origin.
It is the theoretical basis of the matrixing between camera above, the images match that different cameral obtains is got up, it can be with
Reverse push goes out the coordinate of the point of world coordinate system.This process allow intersectional region object different points position with
So-called " depth " is expressed, their three-dimensional relative positional relationship can be obtained.
It further, is the schematic diagram for the depth that the parallax that two cameras generate measures corresponding points, Fig. 5 referring to Fig. 5, Fig. 5
In, a bit for space to be measured, Ol, Or are respectively the origin of coordinate system where the microlens of left and right to Pw, and the two distance is baseline
B, the target surface distance apart from left and right camera Cl, Cr are f, Pl, Pr be respectively Pw left and right camera at pixel position.For,
The depth measurement that corresponding points are completed from the match point of two cameras, since the image of two cameras can to the parallax difference of same point
Depth information to obtain this point namely spatial position where it, it is similar available by triangleNamely
Z=bf/dw.Wherein, b is baseline length, that is, two camera coordinates initial point distances, dw are at a distance from P1 to C1 and P2 to C2
The sum of.It is the ideal situation in the case where not considering camera distortion above, in practice, needs to demarcate camera,
In calibration process, camera is demarcated using scaling board, principle is shown in Figure 3.Firstly, in the case where not placing sample
Scaling board is placed in sample region, two cameras is then opened, is collected simultaneously the image of scaling board, scaling board is rotated
Different location, angle, camera are collected simultaneously the image of acquisition, collect at least 20 times images altogether.Then to different location
Image is matched, and since the size of the characteristic area of scaling board is determining, therefore the size of its characteristic area can be thought
Be it is constant, as known quantity, correction by computer to this distance can complete the calibration between camera.Thus
Any point position in space can be measured.
Further, in the present embodiment, before the step S200 further include:
Step S100, camera is demarcated using scaling board in advance.When it is implemented, being placed in sample deposition specific
Scaling board does not open the first source of parallel light 61, the second source of parallel light 62 and first annular light source 51, the second annular light source at this time
52, using the first image capturing system, the image location information of the second image capturing system acquisition scaling board, change scaling board
Position and angle, obtain its in region to be measured different location, direction image, import data in computer, utilize
MATLAB software handles image, and the calibration of camera is completed according to the particular size of scaling board characteristic area.It is specific former
Reason is referring to shown in Fig. 3, Fig. 7.In order to guarantee that precision, the precision of scaling board should be higher than 0.001mm.
Further, the present invention also provides a concrete application embodiments, in concrete application embodiment, the autohemagglutination
The static test of focus lens optics rear cut-off distance includes:
Step 1, the static tester for building self-focusing lens optics rear cut-off distance as shown in Figure 1 and Figure 2, first in figure
Each element of light path system 81 is first laser device 611 according to respective paths sequence, and the first asterism 612, the first collimation is thoroughly
Mirror 613, self-focusing lens 9 to be measured, first annular light source 51, the first microcobjective 41, the first lens barrel 31, first camera 21.The
Two light path systems 82 are identical as 81 principle of the first light path system.Sample to be tested is placed in conplane first directional light
The confluence for the directional light that source system 61, the second source of parallel light system 62 generate.
Step 2, camera calibration, for the system that step 1 is put up, in sample deposition (two light path system confluences
Domain) specific scaling board is placed, do not open the first source of parallel light 61, the second source of parallel light 62 and first annular light source 51, the at this time
Second ring light source 52 is changed using the first image capturing system, the image location information of the second image capturing system acquisition scaling board
Become scaling board position and angle, obtain its in region to be measured different location, direction image, import data to computer
It is interior, image is handled using MATLAB software, the calibration of camera is completed according to the particular size of scaling board characteristic area.
Step 3, sample detection, for complete step 1 device build and the camera calibration of step 2 after, can be light
Complete the detection of sample, sample to be tested be first placed in region to be measured, open the first source of parallel light 61, the second source of parallel light 62 and
First annular light source 51, the second annular light source 52, the position of mobile sample to be tested keep the first source of parallel light 61, second parallel
The directional light that light source 62 generates is intersected in sample to be tested, and the rear section of the focus and sample to be tested generated can clearly be in
On present two cameras, first camera 21,22 acquired image storage of second camera are transferred in computer, to image into
After the preliminary pretreatment of row, rear section of self-focusing lens can be quickly measured using the binocular vision system demarcated
Away from this process no longer needs to mobile camera or sample to be tested, can be to avoid due to mobile both bring kinematic error.
The static test system of the self-focusing lens rear cut-off distance of double light path of the present invention is crossed by two in same plane
Two optical paths composition, source of parallel light system of each freedom of the two optical paths itself on same optical axis, annular light source, micro- object
Mirror, lens barrel, camera composition.Wherein, source of parallel light system is made of laser, asterism, collimation lens, and annular light source is with microcobjective
Micro imaging system is constituted, corresponding image letter can be obtained in the imaging plane of microcobjective namely the target position of camera
Breath.Match cognization processing, available self-focusing are carried out to the image information that two cameras demarcated obtain by computer
The position in the focus of lens and rear section, and then the rear cut-off distance of self-focusing lens can be found out, it is the rear cut-off distance of self-focusing lens
Test provides a kind of method of the rapid survey of static test.The self-focusing lens rear cut-off distance of double light path proposed by the present invention
Static test can be measured certainly in the case where not moving camera or sample to be tested in the case where one-shot measurement
The rear cut-off distance of condenser lens.
In conclusion deficiency of the present invention for measurement self-focusing lens rear cut-off distance now, propose a kind of static test from
The method of condenser lens rear cut-off distance, the measurement method provide a kind of new mode for the test of self-focusing lens.The present invention is logical
It crosses and the measurement problem of rear cut-off distance is converted into spatially the distance between different location problem, using the calibration completion pair of on-gauge plate
The detection of spatial position identifies the judgement of rear surface and focus by machine vision software, to quickly obtain in the quiescent state
The rear surface of self-focusing lens and focal position, and then obtain its rear cut-off distance and corresponding information is stored, to realize
Static test purpose can be avoided introducing kinematic error, greatly shorten the testing time.
It should be understood that the application of the present invention is not limited to the above for those of ordinary skills can
With improvement or transformation based on the above description, all these modifications and variations all should belong to the guarantor of appended claims of the present invention
Protect range.
Claims (10)
1. a kind of static tester of self-focusing lens optics rear cut-off distance, which is characterized in that including image processing system and two
A light path system arranged in a crossed manner in the same plane；
The light path system includes: the image capturing system connecting with image processing system, and is arranged in image capturing system
Front is simultaneously in the source of parallel light system on same optical axis with image capturing system；
Described image acquisition system includes the annular light source, microcobjective and camera set gradually from front to back；
Described image acquisition system is for obtaining the self-focusing lens to be detected being placed in two light path system intersectional regions
Focus and rear end face information, described image processing system are used to handle the focus and rear end face information of acquisition, and according to
The rear cut-off distance of self-focusing lens is calculated in the focus of self-focusing lens and the positional relationship of rear end face.
2. the static tester of self-focusing lens optics rear cut-off distance according to claim 1, which is characterized in that the figure
As being additionally provided with the mounting base for placing self-focusing lens to be detected, the installation between acquisition system and source of parallel light system
Seat is located in described two light path system intersectional regions.
3. the static tester of self-focusing lens optics rear cut-off distance according to claim 1, which is characterized in that described aobvious
The lens barrel with microcobjective and camera target surface on same optical axis is additionally provided between speck mirror and camera.
4. the static tester of self-focusing lens optics rear cut-off distance according to claim 1, which is characterized in that two institutes
It is arranged in a crossed manner in 30~60 ° of angles to state light path system.
5. the static tester of self-focusing lens optics rear cut-off distance according to claim 1, which is characterized in that described flat
Line light source system includes the laser, asterism and collimation lens set gradually from front to back.
6. the static tester of self-focusing lens optics rear cut-off distance according to claim 5, which is characterized in that the standard
The focal length of straight lens is distance of the collimation lens to asterism.
7. a kind of static test side of the self-focusing lens optics rear cut-off distance based on static tester described in claim 1
Method, which is characterized in that comprising steps of
Self-focusing lens to be detected is placed in described two light path system intersectional regions, source of parallel light system and annular are opened
Light source irradiates self-focusing lens to be detected so that understand the focus and rear end face for seeing that it is formed clearly by microcobjective, and by its
It is imaged on the camera target surface that each image capturing system has been demarcated in advance, corresponding image information is obtained by camera；
Three-dimensionalreconstruction is handled and is carried out to the focus and rear end face information of the self-focusing lens to be detected of each camera acquisition,
The focus of self-focusing lens and the positional relationship of rear end face are obtained, the position of focus and rear end face further according to self-focusing lens is closed
The rear cut-off distance of self-focusing lens is calculated in system.
8. the static test of self-focusing lens optics rear cut-off distance according to claim 7, which is characterized in that the side
Method, which further comprises the steps of:, in advance demarcates camera using scaling board.
9. the static test of self-focusing lens optics rear cut-off distance according to claim 7, which is characterized in that described right
The focus and rear end face information for the self-focusing lens to be detected that each camera obtains are handled and are carried out three-dimensionalreconstruction, are obtained certainly
The step of focus of condenser lens and the positional relationship of rear end face, specifically includes:
The image obtained to camera pre-processes, and then carries out identification matching, and the image for obtaining two cameras connects,
The depth information of focus and rear end face is obtained according to two matched relationships of camera, obtains the focus and rear end face of self-focusing lens
Relative positional relationship.
10. the static test of self-focusing lens optics rear cut-off distance according to claim 9, which is characterized in that described
The step of image for obtaining two cameras connects specifically includes:
It is converted by coordinate, different cameral is got up with relationship simultaneous between world coordinate system, the image for obtaining two cameras
It connects.
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