CN105025290B - A kind of inclined method between adjust automatically camera module sensor and camera lens - Google Patents
A kind of inclined method between adjust automatically camera module sensor and camera lens Download PDFInfo
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Abstract
A kind of inclined method between adjust automatically camera module sensor and camera lens, it comprises the following steps：Test light is provided by light source and mark version；Locating platform drives camera lens to be moved with the relatively described sensor of predetermined step-length；The MTF data of the test light of image capturing system collection transmission camera module；Carried out curve fitting by MTF data, the apogee distance for obtaining designated area MTF data is poor, to calculate the gradient between camera module sensor and camera lens；And according to gradient, camera module is corrected by locating platform.The present invention carries out curve fitting by big step defocusing curve, to predict the result of calculation of small step defocusing curve, improve the efficiency of whole test, and locating platform can use six-freedom parallel locating platform, ensure the center superposition at its center and sensor, so as to guarantee that accurately and timely the inclination between sensor and camera lens is corrected.
Description
Technical field
It is more particularly to a kind of to be based on image meter the present invention relates to a kind of method that adjust automatically camera module inclines (tilt)
Calculate gradient and the method for being corrected adjustment between camera module sensor and camera lens.
Background technology
With the high speed development of mobile phone industry, high-pixel mobile phone camera module is to sensor (sensor) and camera lens (lens)
Between incline (Tilt) requirement it is very strict, gradient during module group assembling between sensor and camera lens is excessive to be may result in
Unilateral picture paste, this directly influences the yield of product, and how fast and accurately calculating gradient and giving correction is when previous
Important research direction.
MTF (modulation transfer function) is an accurate, objective and quantitative picture in optical system picture element evaluation method
Matter evaluation index.In same optical system, by the different original signal input of spatial frequency, the modulation degree by system and not
The ratio between modulation degree through system, is defined as modulation transfer function.With frequency f as abscissa, MTF is ordinate, and connection is different
The curve that the mtf value of frequency is constituted, referred to as MTF curve.Sensor and camera lens when MTF curve can be used to calculate module group assembling
Between gradient, but the traditional method based on small step defocusing curve is, it is necessary to testing time more long so that efficiency compared with
It is low.
In addition, angle of gradient during module group assembling between sensor and camera lens generally with camera lens relative to center sensor
Degree is characterized, however, general adjustment platform, all it cannot be guaranteed that the center superposition of its center of circle and sensor, thus can not accurately,
Rapidly and effectively gradient is corrected.
The content of the invention
It is a primary object of the present invention to provide inclined side between a kind of adjust automatically camera module sensor and camera lens
Method, wherein predicting the result of calculation of small step defocusing curve by being carried out curve fitting to big step defocusing curve, improves whole
The efficiency of test.
Another object of the present invention is to provide inclined side between a kind of adjust automatically camera module sensor and camera lens
Method, wherein six-freedom parallel locating platform can be used to correct the inclination between camera module sensor and camera lens, so as to solve
Certainly described bad, the improve product quality for inclining the unilateral picture paste for causing.
Another object of the present invention is to provide inclined side between a kind of adjust automatically camera module sensor and camera lens
Method, wherein the six-freedom parallel locating platform can ensure the center superposition at its center and the sensor, so as to ensure
Accurately and timely the inclination between the sensor and the camera lens can be corrected.
Another object of the present invention is to provide inclined side between a kind of adjust automatically camera module sensor and camera lens
Method, wherein only need to carry out global analysis by the limited data of sampled point, and the distribution situation based on these data is entered
Row curve matching, you can with the gradient being calculated between the sensor and the camera lens, so as to greatly save the time,
Improve operational efficiency.
Another object of the present invention is to provide inclined side between a kind of adjust automatically camera module sensor and camera lens
Mark version (chart) that method, wherein methods described are used contains various test zones, such that it is able to be completed by a mark version
Various test events, to reduce the number of times of more dehorn version, so as to reduce the time required for test.
Another object of the present invention is to provide inclined side between a kind of adjust automatically camera module sensor and camera lens
Method, wherein methods described are simple to operate, low cost, and time-consuming, are suitable in the camera module production process,
The detection and correction of the gradient between the sensor and the camera lens are efficiently completed in time.
To achieve the above objectives, the present invention provides inclined side between a kind of adjust automatically camera module sensor and camera lens
Method, it comprises the following steps：
A () provides test light by light source and mark version；
B () locating platform drives the camera lens to be moved with the relatively described sensor of predetermined step-length；
The MTF data of the test light of (c) image capturing system collection transmission camera module；
D () carries out curve fitting by the MTF data, obtain the apogee distance of MTF data described in designated area
Difference, to calculate the gradient between the camera module sensor and camera lens；And
E () is corrected by the locating platform according to the gradient to the camera module.
According to one embodiment of present invention, in the above-mentioned methods, the length of the step-length is at 5~25 μm.
According to one embodiment of present invention, in the above-mentioned methods, the length of the step-length is at 10~15 μm.
According to one embodiment of present invention, in the above-mentioned methods, the length of the step-length is the horse of the camera module
Up to the 1/5~1/25 of stroke.
According to one embodiment of present invention, in the above-mentioned methods, the locating platform is that six-freedom parallel positioning is flat
Platform.
According to one embodiment of present invention, in the above-mentioned methods, the mark version includes defocus MTF data acquisitions region,
Evaluating data pickup area and the datum mark region for position location.
According to one embodiment of present invention, in the above-mentioned methods, in the step (d), first the MTF data are entered
Row gaussian filtering process, then from filtered extracting data maximum, centered on maximum of points, extracts to from left to right and refers to
Determine the data point of number, the data point to participating in calculating carries out global analysis, intended using Gauss model and least square multinomial
The mode that conjunction is combined is fitted to data.
According to a further aspect of the invention, the present invention also provide a kind of adjust automatically camera module sensor and camera lens it
Between inclined method, it comprises the following steps：
(A) image capturing system gathers 5~25 MTF of effective sampling points in the camera module defocus motion process
Data；
(B) carried out curve fitting by the MTF data to the effective sampling points, obtain MTF described in designated area
The apogee distance of data is poor, to calculate the gradient between the camera module sensor and camera lens；And
(C) according to the gradient, the camera module is corrected by locating platform.
According to one embodiment of present invention, in the above-mentioned methods, the effective sampling points in the step (A) are 8~10
It is individual.
According to one embodiment of present invention, in the above-mentioned methods, in the step (B), first the MTF data are carried out
Gaussian filtering process, then from filtered extracting data maximum, centered on maximum of points, extracts to from left to right and specifies
The data point of number, the data point to participating in calculating carries out global analysis, using Gauss model and least square polynomial fit
The mode being combined is fitted to data.
According to one embodiment of present invention, in the above-mentioned methods, in the step (C), six-freedom parallel is used
Locating platform is corrected to the camera module.
Brief description of the drawings
Fig. 1 is inclined between adjust automatically camera module sensor and camera lens according to a preferred embodiment of the present invention
Method used in mark version schematic diagram.
Fig. 2 is inclined between the adjust automatically camera module sensor of above preferred embodiment of the invention and camera lens
Method in gradient sign schematic diagram.
Fig. 3 is MTF curve figure when defocus step-length is 1 μm.
Fig. 4 is inclined between the adjust automatically camera module sensor of above preferred embodiment of the invention and camera lens
Method in MTF curve figure of defocus step-length when being 10 μm.
Fig. 5 is inclined between the adjust automatically camera module sensor of above preferred embodiment of the invention and camera lens
Method schematic flow sheet.
Fig. 6 is inclined between the adjust automatically camera module sensor of above preferred embodiment of the invention and camera lens
Method the step of schematic diagram.
Fig. 7 is inclined between the adjust automatically camera module sensor of above preferred embodiment of the invention and camera lens
Method the step of schematic diagram.
Specific embodiment
Hereinafter describe for disclosing the present invention so that those skilled in the art can realize the present invention.It is excellent in below describing
Embodiment is selected to be only used as citing, it may occur to persons skilled in the art that other obvious modifications.Define in the following description
General principle of the invention can apply to other embodiments, deformation program, improvement project, equivalent and without the back of the body
From the other technologies scheme of the spirit and scope of the present invention.
As shown in Figures 1 to 7 adjust automatically camera module sensor according to a preferred embodiment of the present invention with
The schematic diagram of inclined method between camera lens.In methods described of the invention, the test equipment for being used includes mark version, light source
And locating platform, such as six-freedom parallel locating platform.
The mark version can be traditionally used for gradient detection between test camera module sensor and camera lens using various
Mark version.This preferred embodiment of the invention, as shown in figure 1, the mark version can include various test zones.As schemed
A represents defocus MTF data acquisitions region in 1, and B represents final evaluating data pickup area, and C represents the Mark of quick position location
Point region.It is most with whole test process so as to the camera module can complete various test events by the mark version
May less more dehorn version.That is, it is necessary to be passed to the camera module in the test process of traditional camera module
The test mark version that gradient is detected between sensor and camera lens, and the image quality of the final camera module is commented
The test mark version of valency, it is necessary to use different test mark versions in different test process.And in the present invention, gather MTF numbers
According to and the mark version of final evaluation be all same mark version, so, in whole test process, it is not necessary to more dehorn version so that
Greatly save the time.
As shown in fig. 1, the mark version of the invention generally comprises three parts.In this preferred embodiment of the invention
In, the mark version includes four A areas, i.e., the A areas of the middle part positioned at upside shown in figure, the middle part positioned at downside
A areas, positioned at left side middle part A areas and the A areas of middle part positioned at right side.It is described mark version including five B
Area, i.e., positioned at the B areas and the B areas positioned at the mark version corner at the center of the mark version.As shown in fig. 1, the mark version can
To include multiple Mark points.
In the test process of the camera module, the Mark points in the C areas of the mark version are used for quick positioning and calibrate.So
Afterwards, the A areas of the mark version, i.e., described defocus MTF data acquisitions region can be used to detect the camera module sensor
Gradient between camera lens.Finally, the B areas of the mark version, comment for the image quality to the whole camera module
Valency.
The inclined method of adjustment between the camera module sensor and camera lens of this preferred embodiment of the invention
In, by curve fitting algorithm, defocus MTF curve is fitted, calculated using the data that step defocusing curve is fitted greatly
Gradient between the camera module sensor and camera lens, to improve testing efficiency.
More specifically, when gradient between the camera module sensor and camera lens is calculated, it is necessary to pass through Tu1Zhong A areas
Symmetrical region defocus MTF curve apogee distance difference come calculate between the camera module sensor and camera lens incline
Angle theta 1 in the plane and θ 2 are spent, as shown in Figure 2.
The camera module sensor is coupled to voice coil motor, and the operation of the motor is mainly displacement, the change of displacement
It is the change of focal length in the performance of camera lens, and embodiment of the change of focal length on image is the change of image definition, so with
The situation of change of MTF, can indirectly test the change in displacement situation of the motor, by the relative position for changing the motor
To change change in displacement of the camera lens relative to focal position, then by calculating MTF of the motor operation in diverse location image
Value, can just judge the ruuning situation of the motor.
It is as shown in Figure 5 to incline between the adjust automatically camera module sensor of this preferred embodiment of the invention and camera lens
The schematic flow sheet of oblique method.The motor and lens assembly is driven to walk defocus by the six-freedom parallel locating platform
Curve.Motor operation is run according to the fixed step size of setting, and the image of step-length where obtaining simultaneously shows figure on computers
Picture, calculates mtf value and real-time rendering curve, to terminate all mtf values of post analysis and showing test result in test stroke.Root
According to it is linear between the motor displacement and driving current the characteristics of, MTF and the optic image distance of the camera module are in
Existing relation is the normal distribution curve centered on focal length.2 points according to more than, can derive, the horse being fitted using MTF
Up to curve similar to a normal distribution curve.
During test, initialization test module makes the motor be parked in the step number of initialization, and the test module is photographed
Mark domain seem square because test module sensor transmissions figure be square, described image through image pass
Transfer device is transferred to computer combination lens optical characteristic, can directly test out between auto-focusing process camera lens and sensor
Gradient, the gradient of motor reflects the gradient of sensor.In test curve, while drawing four angles of square-shaped image
Mtf value and motor one direction step-length curve, four curves of drafting are also normal distribution curve, find out four the four of curve
Individual peak position, the incline direction of motor is the angle lapping from where angular first peak where last peak
Tiltedly.
As shown in Figures 3 and 4, it is respectively foursquare upper left angular curve, upper right angular curve, lower-left angular curve is, with
And bottom right angular curve, incline direction is inclined to the direction in the upper right corner along the lower left corner.Traditional method is in order to ensure to calculate knot
The accuracy of fruit, it is necessary to run small step defocusing curve, will certainly influence operational efficiency, be 120 μm with total kilometres, 1 step run time
As a example by 100ms, 1 μm shown in Fig. 3/step required for total testing time be 12s, 10 μm shown in Fig. 4/operation of step is when always testing
Between be 1.2s, efficiency has and is significantly lifted, and the calculation error of gradient is typically relevant with step-length, and step-length is bigger, and error is got over
Greatly.In order to overcome the error brought during raising efficiency, least square curve fitting algorithm is made present invention uses orthogonal polynomial,
The data that the algorithm can be obtained by big step defocus simulate the peak result of small step defocusing curve, and its principle is first to original
Beginning data carry out gaussian filtering process, then from filtered extracting data maximum, centered on maximum of points, to left-hand
Right to extract the data point for specifying number, the data point to participating in calculating carries out global analysis, according to different data distribution situations,
Data are fitted by the way of Gauss model and least square polynomial fit are combined.
That is, as shown in fig. 6, inclined side between adjust automatically camera module sensor of the invention and camera lens
Method, comprises the following steps：
A () provides test light by light source and mark version；
B () locating platform drives the camera lens to be moved with the relatively described sensor of predetermined step-length；
The MTF data of the test light of (c) image capturing system collection transmission camera module；
D () carries out curve fitting by the MTF data, obtain the apogee distance of MTF data described in designated area
Difference, to calculate the gradient between the camera module sensor and camera lens；And
E () is corrected by the locating platform according to the gradient to the camera module.
As shown in Figure 3, when defocus step-length is 1 μm, the original MTF data of a-quadrant, obtain upper and lower MTF curve most in Fig. 1
High point is 33.2 μm apart from its difference, and the difference of left and right MTF curve apogee distance is 33.3 μm.
As shown in Figure 4, when defocus step-length is 10 μm, by the MTF data of a-quadrant in curve matching Fig. 1, obtain up and down
The difference of MTF curve apogee distance is 31.6 μm, and the difference of left and right MTF curve apogee distance is 31.7 μm.Surveyed from actual algorithm
In examination, error is within work tolerance interval, and institute is effective and feasible in this way.
After the gradient is calculated, by the locating platform, this preferred embodiment of the invention it is described
Six-freedom parallel locating platform, corrects to gradient.Because the gradient θ 1 and θ 2 that calculate are relative to described
The angle of center sensor, due to product feature, general adjustment platform cannot ensure the center in its center of circle and the sensor
Overlap, and the six-freedom parallel locating platform of the invention can meet the demand of this respect, it can be separately provided circle
The heart is the angle adjustment that origin does whole space plane with it to the center sensor.
In the above method of the invention, the predetermined defocus step-length is to walk defocus step-length greatly, that is to say, that defocus is walked
Numerical value long is bigger, so, can be significantly reduced total testing time, improves efficiency.In this preferred embodiment of the invention
In, the defocus step-length can be 5~25 μm, such as 10 μm shown in figure 4 above.It will be appreciated by those skilled in the art that
It is that, as long as test request can be met, the defocus step-length can also be other numerical value.
The light source of the invention, can be back light, and its test light for sending projects the mark version, for
Measurement MTF data.The light-source brightness is stable and makes the brightness uniformity of the whole light source panel, and in test, leads to
The image of display device display measurement is crossed, the mark version and the size and size of the light source need adjustment, filled with full of display
Whole image in putting.
It is noted that the predetermined defocus step-length also should not be too big, and enough effective quantity have been the need to ensure that it
Sampled point.For example, in the above method of the invention, 5~25 effective sampling points, more specifically embodiment can be gathered
In, 8~10 effective sampling points can be gathered, then according to these effective sampling points, MTF curve is made and is fitted, so as to count
Calculate the gradient.It will be appreciated by persons skilled in the art that according to actual requirement, the quantity of the effective sampling points
Can choose as needed.
That is, from still further aspect, as shown in fig. 7, the invention provides a kind of adjust automatically camera module sensing
Inclined method, comprises the following steps between device and camera lens：
(A) image capturing system gathers 5~25 MTF of effective sampling points in the camera module defocus motion process
Data；
(B) carried out curve fitting by the MTF data to the effective sampling points, obtain MTF described in designated area
The apogee distance of data is poor, to calculate the gradient between the camera module sensor and camera lens；And
(C) according to the gradient, the camera module is corrected by locating platform.
In the above-mentioned methods, the effective sampling points in the step (A) can be 8~10.In the step (B), first
Gaussian filtering process is carried out to initial data, then from filtered extracting data maximum, centered on maximum of points, to
From left to right extracts the data point for specifying number, and the data point to participating in calculating carries out global analysis, according to different data distributions
Data are fitted by situation by the way of Gauss model and least square polynomial fit are combined.At the step (C)
In, it is possible to use six-freedom parallel locating platform is precisely corrected to the camera module.
The above method of the invention, the MTF numerical value just for limited sampled point carries out calculating treatment, from these limited
Sampled point assesses the distribution situation of overall data, so as to greatly save testing results time, improve production efficiency.
It should be understood by those skilled in the art that the embodiments of the invention shown in foregoing description and accompanying drawing are only used as citing
And it is not intended to limit the present invention.The purpose of the present invention completely and is effectively realized.Function of the invention and structural principle exist
Show in embodiment and illustrate, under without departing from the principle, embodiments of the present invention can have any deformation or modification.
Claims (9)
1. a kind of inclined method between adjust automatically camera module sensor and camera lens, it is characterised in that comprise the following steps：
A () provides test light by light source and mark version；
B () locating platform drives the camera lens to be moved with the relatively described sensor of predetermined step-length, the predetermined step-length is big
Step defocus step-length, the big step defocus step-length ensure that the sampled point of enough effective quantity；
The MTF data of the test light of (c) image capturing system collection transmission camera module；
D () carries out curve fitting by the MTF data, it is poor to obtain MTF data apogee distance described in designated area, in terms of
The gradient between the camera module sensor and camera lens is calculated, wherein the step of being carried out curve fitting to the MTF data
Specifically include：Gaussian filtering process first is carried out to the MTF data, then from filtered extracting data maximum, with most
Centered on big value point, the data point for specifying number is extracted to from left to right, the data point to participating in calculating carries out global analysis, uses
The mode that Gauss model and least square polynomial fit are combined is fitted to data；And
E () is corrected by the locating platform according to the gradient to the camera module.
2. inclined method between adjust automatically camera module sensor as claimed in claim 1 and camera lens, it is characterised in that
The length of the step-length is at 5~25 μm.
3. inclined method between adjust automatically camera module sensor as claimed in claim 2 and camera lens, it is characterised in that
The length of the step-length is at 10~15 μm.
4. inclined method between adjust automatically camera module sensor as claimed in claim 1 and camera lens, it is characterised in that
The length of the step-length is the 1/5~1/25 of the motor stroke of the camera module.
5. inclined method between adjust automatically camera module sensor as claimed in claim 1 and camera lens, it is characterised in that
The locating platform is six-freedom parallel locating platform.
6. inclined method between adjust automatically camera module sensor as claimed in claim 1 and camera lens, it is characterised in that
The mark version includes defocus MTF data acquisitions region, evaluating data pickup area and the datum mark region for position location.
7. a kind of inclined method between adjust automatically camera module sensor and camera lens, it is characterised in that comprise the following steps：
(A) image capturing system gathers the MTF numbers of 5~25 effective sampling points in the camera module defocus motion process
According to；
(B) carried out curve fitting by the MTF data to the effective sampling points, obtain MTF data described in designated area
Apogee distance is poor, to calculate the gradient between the camera module sensor and camera lens, wherein entering to the MTF data
The step of row curve matching, specifically includes：Gaussian filtering process first is carried out to the MTF data, then from filtered data
Maximum is extracted, centered on maximum of points, the data point for specifying number is extracted to from left to right, the data to participating in calculating are clicked through
Data are fitted by row global analysis by the way of Gauss model and least square polynomial fit are combined；And
(C) according to the gradient, the camera module is corrected by locating platform.
8. inclined method between adjust automatically camera module sensor as claimed in claim 7 and camera lens, it is characterised in that
Effective sampling points in the step (A) are 8~10.
9. inclined method between adjust automatically camera module sensor as claimed in claim 7 and camera lens, it is characterised in that
In the step (C), the camera module is corrected using six-freedom parallel locating platform.
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| CN106888344B (en) * | 2015-12-16 | 2020-04-03 | 宁波舜宇光电信息有限公司 | Camera module and image plane inclination acquisition method and adjustment method thereof |
| CN106896622B (en) * | 2015-12-21 | 2019-08-30 | 宁波舜宇光电信息有限公司 | Bearing calibration based on multiple spurs from auto-focusing |
| TWI603060B (en) * | 2016-03-02 | 2017-10-21 | 由田新技股份有限公司 | Automatic object alignment method and automatic alignment inspection device thereof |
| CN105744266B (en) * | 2016-03-25 | 2018-09-04 | 宁波舜宇光电信息有限公司 | The inclinometric system and measurement method of camera module |
| CN107656418B (en) * | 2016-07-26 | 2020-04-28 | 宁波舜宇光电信息有限公司 | Method for testing and calculating inclination of optical axis of focusing camera module |
| CN107403453B (en) * | 2017-07-25 | 2020-11-17 | 歌尔光学科技有限公司 | Adjusting method and device based on photoelectric module |
| CN107707822B (en) * | 2017-09-30 | 2024-03-05 | 苏州凌创电子系统有限公司 | Online camera module active focusing equipment and method |
| CN108107362B (en) * | 2017-12-26 | 2020-06-26 | 信利光电股份有限公司 | Method, device and equipment for judging secondary slope of voice coil motor characteristic curve |
| CN107920246B (en) * | 2017-12-28 | 2019-10-25 | Oppo广东移动通信有限公司 | The gradient test method and device of camera module |
| CN109981932B (en) * | 2017-12-28 | 2024-03-08 | 宁波舜宇光电信息有限公司 | Depth camera based on structured light and correction method thereof |
| CN110300252B (en) * | 2018-03-22 | 2021-06-04 | 爱佩仪（东莞）光电科技有限公司 | Lens inclination correction method and device |
| CN111902770B (en) * | 2018-03-30 | 2022-04-15 | 索尼公司 | Image forming apparatus and control method thereof |
| CN110824652B (en) * | 2018-08-07 | 2021-12-07 | 宁波舜宇光电信息有限公司 | Method for assembling structured light projection module |
| CN110824722B (en) * | 2018-08-07 | 2021-10-15 | 宁波舜宇光电信息有限公司 | Structured light projection module assembly device and projection module assembly and detection method |
| CN110913095B (en) * | 2018-09-17 | 2021-06-04 | 宁波舜宇光电信息有限公司 | Adjustable camera module and assembly test method thereof |
| CN109862351B (en) * | 2019-03-05 | 2020-07-17 | 横店集团东磁有限公司 | Camera module resolution detection method |
| CN110753172B (en) * | 2019-10-22 | 2022-02-15 | Oppo广东移动通信有限公司 | Correction method and device, electronic equipment and voice coil motor |
| CN111277762B (en) * | 2020-03-05 | 2021-10-08 | 昆山丘钛微电子科技股份有限公司 | Focusing method, device, equipment and medium for camera module |
| CN113114905B (en) * | 2021-04-16 | 2022-05-03 | 广州立景创新科技有限公司 | Camera module, focusing adjustment system and focusing method |
| CN114125303B (en) * | 2021-11-30 | 2023-08-25 | 重庆紫光华山智安科技有限公司 | Test image acquisition method, device, equipment and medium |
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| JP4698692B2 (en) * | 2008-02-27 | 2011-06-08 | アキュートロジック株式会社 | MTF measuring method and MTF measuring apparatus |
| CN103149789B (en) * | 2013-02-28 | 2015-08-26 | 宁波舜宇光电信息有限公司 | The method of testing of module motor curve is evaluated based on image MTF |
| CN103592108A (en) * | 2013-12-01 | 2014-02-19 | 西安电子科技大学 | CCD chip modulation transfer function test device and method |
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