CN109862351A - A kind of camera module resolution method of inspection - Google Patents
A kind of camera module resolution method of inspection Download PDFInfo
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- CN109862351A CN109862351A CN201910164033.2A CN201910164033A CN109862351A CN 109862351 A CN109862351 A CN 109862351A CN 201910164033 A CN201910164033 A CN 201910164033A CN 109862351 A CN109862351 A CN 109862351A
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Abstract
The present invention relates to camera module field of quality control, and in particular to a kind of camera module resolution method of inspection, comprising the following steps: A) several boards crawl frame is set, obtain the mtf value of each crawl frame；B several camera module samples) are taken, obtain resolution of the sample in each crawl frame through man-made chamber；C the minimum resolution for) obtaining qualified samples, using corresponding mtf value as the reference mtf value of each crawl frame；It D is more than) to should refer to the camera module of mtf value as detecting qualified product using each crawl frame by board.Substantial effect of the invention is: by the position of optimal grasp frame, it is made only to cover the test features of single direction, reduce transverse and longitudinal differentia influence, by formulating reasonable reference value, improved and examine accuracy.
Description
Technical field
The present invention relates to camera module field of quality control, and in particular to a kind of camera module resolution inspection party
Method.
Background technique
Camera module is mainly used in the electronic terminal products such as mobile phone, tablet computer, unmanned plane, medical treatment, now
As the essential household goods of people.It before camera module factory, needs to test to its resolution, to ensure that it is
Qualified product.It is the important means for guaranteeing and improving camera module quality that resolution, which is examined,.The mtf value and parsing angle value of camera lens,
It is the accurate measurement for reflecting camera lens analytic ability.What mtf value can be convenient is automatically obtained by machine, and is parsed angle value and needed people
Part work and part study takes.The qualified reference of usual camera module, is provided in a manner of resolution.Accurate resolution test, needs people
Eye judgement and reading scale value, can read the value of resolution.It manually carries out test and checkability is low, be easy error.Cause
And when carrying out the batch inspection of camera module resolution, it is to test using with referring to mtf value substantially of equal value.
What mtf value represented is the replication rate of the contrast under certain fringe spatial frequency.The mtf value of camera lens is the resolving power to camera lens
A quantitative description, be exactly the readability to lens imaging, include two factors of resolution ratio and acutance.Mtf value
It is to automatically process camera module using rack to shoot, in the preset image grabbed in frame, passes through existing calculation method
Calculate acquisition.When testing the mtf value of camera module (Compact Camera Module, CCM), carried out generally in light box,
One test Chart is attached at the top of light box, ISO12233 is generallyd use as test Chart, CCM and is placed in the table of light box bottom
In rack on face, it is desirable that desktop and Chart keeping parallelism have CCM image acquisition device in rack, by collected image number
It is transferred in the computer on side according to data line, the test software on computer is analyzed collected image and obtained by algorithm process
The mtf value of camera module out.At present in the test of mtf value, with regard to each crawl frame, board is sentenced for the center Chart, each angle of surrounding
Determining mode is the average value for grabbing H, V in frame (laterally, longitudinal), is easy by H, V differentia influence.Such as required with parsing 1000 be
Example, H:1100, V:900, system can also determine qualification.Cause in the qualified camera module examined by mtf value, there are some times
Product.Mtf value is the value of a percents, and resolution is the value with bearing mark.It replaces manually being solved using mtf value
Angle value is analysed, will lead to the problem of examining accuracy decline when testing.It thus needs to find that taking the photograph for more substandard products can be filtered
As the head mould group resolution batch method of inspection.
Chinese patent CN101122544A, publication date on 2 13rd, 2008, a kind of MTF measurement system, MTF measuring method,
MTF measurement device and MTF mensuration program.The high efficiency of its evaluation measurement operation for realizing lens performance.It is shot according to shooting
Body and the volumetric image data shot that obtains and indicate that the MTF generated by the MTF data of the index as evaluation lens performance is bent
The MTF curve image data of line generates the measurement result picture data for indicating subject image and MTF curve figure picture, passes through
The measurement result picture for showing the measurement result picture data based on the generation measures operation in the evaluation for carrying out lens performance
When, real-time display indicates the measurement result picture of subject image and MTF curve figure picture, and user is according to measurement result picture
Whether MTF curve figure picture can be held and need to adjust focus, be shot as needed to adjust with what MTF curve figure picture was display together
The focus of body image, while according to MTF curve figure picture, lens performance evaluation can also be carried out.But it not can solve using mtf value
Instead of the parsing angle value manually obtained, the problem of examining accuracy decline will lead to when testing.
Summary of the invention
The technical problem to be solved by the present invention is the technology that the accuracy of current camera module resolution batch testing is low
Problem.Propose a kind of camera module resolution method of inspection for optimizing crawl frame and choosing with result judgement method.
In order to solve the above technical problems, the technical solution used in the present invention are as follows: a kind of camera module resolution inspection
Method, comprising the following steps: A) several boards crawl frame is set, obtain the mtf value of each crawl frame；B several camera shootings) are taken
Head mould group sample obtains resolution of the sample in each crawl frame through man-made chamber；C the minimum parsing of qualified samples) is obtained
Degree, using corresponding mtf value as the reference mtf value of each crawl frame；It D is more than) to should refer to MTF by each crawl frame by board
The camera module of value is as detection qualified product.
Preferably, the method for several boards crawl frame is arranged are as follows: be set as board crawl frame individually to grab frame institute
Covering lines are same direction, and line orientations needed for several crawl frame coverage tests, line orientations include transverse direction, longitudinal direction, diameter
To and it is circumferential.
Preferably, man-made chamber obtains the method for the resolution of sample the following steps are included: B1) by camera module sample
Product, which are mounted on, to be lighted on instrument；B2) shooting resolution test chart obtains shooting picture；B3) corresponded to by manually reading
The parsing angle value of each crawl frame position.
Preferably, obtain qualified samples minimum resolution method are as follows: C11) screening take in several samples
Qualified product；C12 it) obtains in qualified product, the minimum of the resolution corresponding to each crawl frame position；C13) by each crawl frame
The resulting mtf value of the corresponding board of resolution minimum, the reference mtf value as the crawl frame position.
Preferably, the method for obtaining the minimum resolution of qualified samples are as follows: C21) it obtains corresponding to each crawl frame
Resolution and mtf value data pair；C22 fitting function of the mtf value to resolution of each crawl) is obtained by fitting, it is described quasi-
It is combined into linear fit；C23 the corresponding fitting function of the equidirectional crawl frame of lines) will be covered to be weighted and averaged, obtained final
Fitting function；C24) final fitting function that resolution required value is substituted into each crawl frame, obtains the reference of each crawl frame
Mtf value.
Preferably, the method for obtaining final fitting function M=N (J) are as follows:
Wherein, M is mtf value, and J is parsing angle value, and n is the quantity for covering the equidirectional crawl frame of lines, NiIt is corresponding quasi- for crawl frame i
Close function, ciFor crawl frame i correspond to the resolution of resolution and the centering of mtf value data and, C=c1+c2+…+cn。
Substantial effect of the invention is: by the position of optimal grasp frame, it is made only to cover the p-wire of single direction
Item reduces transverse and longitudinal differentia influence, by formulating reasonable reference value, improves and examines accuracy.
Detailed description of the invention
Fig. 1 is one camera module resolution method of inspection flow diagram of embodiment.
Fig. 2 is current crawl frame position view.
Fig. 3 is that embodiment a part grabs frame position view.
Specific embodiment
Below by specific embodiment, and in conjunction with attached drawing, a specific embodiment of the invention is further described in detail.
Embodiment one:
A kind of camera module resolution method of inspection, as shown in Figure 1, the present embodiment is the following steps are included: A) several are set
Board grabs frame, obtains the mtf value of each crawl frame；B several camera module samples) are taken, obtain sample through man-made chamber
Resolution in each crawl frame；C the minimum resolution for) obtaining qualified samples, using corresponding mtf value as each crawl frame
Referring to mtf value；It D is more than) to should refer to the camera module of mtf value as detecting qualified product using each crawl frame by board.
As shown in Fig. 2, covering the test features of multiple directions in current crawl frame, leading to MTF is taken the photograph in all directions
As the synthesis of head mould group resolution, i.e. mean value, the accuracy of inspection is reduced.In the present embodiment, several boards are arranged to grab
The method for taking frame are as follows: be set as individually grabbing the covered lines of frame being same direction by board crawl frame, several crawl frames cover
Line orientations needed for lid is tested, line orientations include transverse direction, longitudinal direction, radial direction and circumferential direction.As shown in figure 3, crawl frame B1, B2 cover
The region of lid is transverse test lines, and the region of crawl frame B9, B10 covering is testing longitudinal lines.According to the needs of test, increase
Add several to grab frame, makes all to grab frame together, the line orientations tested needed for capable of covering all.It is arranged in the present embodiment
Center crawl frame similar with frame B0 is grabbed in Fig. 2 is not shown for grabbing the resolution of circumferencial direction in Fig. 3.
Man-made chamber obtains the method for the resolution of sample the following steps are included: B1) camera module sample is mounted on
It lights on instrument；B2) shooting resolution test chart obtains shooting picture；B3) by manually reading corresponding to each crawl
The parsing angle value of frame position.
The method for obtaining the minimum resolution of qualified samples are as follows: C11) screen the qualified product taken in several samples；
C12 it) obtains in qualified product, the minimum of the resolution corresponding to each crawl frame position；C13) by each crawl frame resolution
The resulting mtf value of the corresponding board of minimum, the reference mtf value as the crawl frame position.
Obtain qualified samples minimum resolution method are as follows: C21) obtain correspond to it is each crawl frame resolution with
Mtf value data pair；C22) mtf value for obtaining each crawl by fitting is fitted to linear fit to the fitting function of resolution；
C23 the corresponding fitting function of the equidirectional crawl frame of lines) will be covered to be weighted and averaged, obtain final fitting function；C24)
The final fitting function that resolution required value is substituted into each crawl frame obtains the reference mtf value of each crawl frame.
The method for obtaining final fitting function M=N (J) are as follows:Its
In, M is mtf value, and J is parsing angle value, and n is the quantity for covering the equidirectional crawl frame of lines, NiFor the corresponding fitting of crawl frame i
Function, ciFor crawl frame i correspond to the resolution of resolution and the centering of mtf value data and, C=c1+c2+…+cn.Such as Fig. 3 institute
Show, lateral final fitting functionWherein cH1The parsing manually read for crawl frame B1
Angle value, cH2For the parsing angle value that crawl frame B2 is manually read, CH=cH1+cH2, NH1(J) for by the crawl frame B1 of several samples
The fitting function that corresponding resolution and mtf value data pair, linear fit or secondary difference fit, NH1(J) for by several
The fitting letter that the corresponding resolution of crawl frame B2 and mtf value data pair of a sample, linear fit or secondary difference fit
Number.Desired parsing angle value is substituted into final fitting function, obtains corresponding mtf value, after appropriate modification, including round up,
Pre- allowance is set, can be used as the reference mtf value for examining corresponding crawl frame B1 and crawl frame B2 used.Remaining crawl frame position
Reference mtf value and so on.
Above-mentioned embodiment is only a preferred solution of the present invention, not the present invention is made in any form
Limitation, there are also other variations and modifications on the premise of not exceeding the technical scheme recorded in the claims.
Claims (8)
1. a kind of camera module resolution method of inspection, which is characterized in that
The following steps are included:
A) several boards crawl frame is set, the mtf value of each crawl frame is obtained；
B several camera module samples) are taken, obtain resolution of the sample in each crawl frame through man-made chamber；
C the minimum resolution for) obtaining qualified samples, using corresponding mtf value as the reference mtf value of each crawl frame；
It D is more than) to should refer to the camera module of mtf value as detecting qualified product using each crawl frame by board.
2. a kind of camera module resolution method of inspection according to claim 1, which is characterized in that
The method of several boards crawl frame is set are as follows: is set as individually grabbing the covered lines of frame being same by board crawl frame
Direction, line orientations needed for several crawl frame coverage tests, line orientations include transverse direction, longitudinal direction, radial direction and circumferential direction.
3. a kind of camera module resolution method of inspection according to claim 1 or 2, which is characterized in that
Man-made chamber obtain sample resolution method the following steps are included:
B1) camera module sample is mounted on and is lighted on instrument；
B2) shooting resolution test chart obtains shooting picture；
B3) by manually reading the parsing angle value corresponding to each crawl frame position.
4. a kind of camera module resolution method of inspection according to claim 1 or 2, which is characterized in that
The method for obtaining the minimum resolution of qualified samples are as follows:
C11) screening takes the qualified product in several samples；
C12 it) obtains in qualified product, the minimum of the resolution corresponding to each crawl frame position；
C13 the reference) by the corresponding resulting mtf value of board of each crawl frame resolution minimum, as the crawl frame position
Mtf value.
5. a kind of camera module resolution method of inspection according to claim 3, which is characterized in that
The method for obtaining the minimum resolution of qualified samples are as follows:
C11) screening takes the qualified product in several samples；
C12 it) obtains in qualified product, the minimum of the resolution corresponding to each crawl frame position；
C13 the reference) by the corresponding resulting mtf value of board of each crawl frame resolution minimum, as the crawl frame position
Mtf value.
6. a kind of camera module resolution method of inspection according to claim 1 or 2, which is characterized in that
The method for obtaining the minimum resolution of qualified samples are as follows:
C21 the resolution and mtf value data pair for corresponding to each crawl frame) are obtained；
C22 fitting function of the mtf value to resolution of each crawl) is obtained by fitting, it is described to be fitted to linear fit；
C23 the corresponding fitting function of the equidirectional crawl frame of lines) will be covered to be weighted and averaged, obtain final fitting function；
C24) final fitting function that resolution required value is substituted into each crawl frame, obtains the reference mtf value of each crawl frame.
7. a kind of camera module resolution method of inspection according to claim 3, which is characterized in that
The method for obtaining the minimum resolution of qualified samples are as follows:
C21 the resolution and mtf value data pair for corresponding to each crawl frame) are obtained；
C22 fitting function of the mtf value to resolution of each crawl) is obtained by fitting, it is described to be fitted to linear fit；
C23 the corresponding fitting function of the equidirectional crawl frame of lines) will be covered to be weighted and averaged, obtain final fitting function；
C24) final fitting function that resolution required value is substituted into each crawl frame, obtains the reference mtf value of each crawl frame.
8. a kind of camera module resolution method of inspection according to claim 6, which is characterized in that
The method for obtaining final fitting function M=N (J) are as follows:Wherein, M
For mtf value, J is parsing angle value, and n is the quantity for covering the equidirectional crawl frame of lines, NiFor the corresponding fitting letter of crawl frame i
Number, ciFor crawl frame i correspond to the resolution of resolution and the centering of mtf value data and, C=cl+c2+…+cn。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112291553A (en) * | 2020-10-22 | 2021-01-29 | 江西欧迈斯微电子有限公司 | Image line detection method of camera module |
| CN113938677A (en) * | 2021-12-16 | 2022-01-14 | 深圳市海瑞洋科技有限公司 | Minimally invasive endoscope camera imaging standard automatic testing system |
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| KR20090012612A (en) * | 2007-07-30 | 2009-02-04 | 김대봉 | Test chart for inspection apparatus of camera module |
| CN101557537A (en) * | 2009-04-20 | 2009-10-14 | 欧学平 | Method for automatically judging resolution |
| CN105025290A (en) * | 2014-04-23 | 2015-11-04 | 宁波舜宇光电信息有限公司 | Method for automatically adjusting inclination between image photographing module group sensor and lens |
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| NL9001265A (en) * | 1990-06-05 | 1992-01-02 | Philips Nv | METHOD FOR DETERMINING A MODULATION TRANSFER FUNCTION OF A DIGITAL IMAGING SYSTEM. |
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| KR20090012612A (en) * | 2007-07-30 | 2009-02-04 | 김대봉 | Test chart for inspection apparatus of camera module |
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Cited By (3)
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| CN112291553A (en) * | 2020-10-22 | 2021-01-29 | 江西欧迈斯微电子有限公司 | Image line detection method of camera module |
| CN112291553B (en) * | 2020-10-22 | 2023-03-24 | 江西欧迈斯微电子有限公司 | Image line detection method of camera module |
| CN113938677A (en) * | 2021-12-16 | 2022-01-14 | 深圳市海瑞洋科技有限公司 | Minimally invasive endoscope camera imaging standard automatic testing system |
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Denomination of invention: A resolution test method for camera module Effective date of registration: 20220622 Granted publication date: 20200717 Pledgee: Dongyang Branch of China Construction Bank Co.,Ltd. Pledgor: HENGDIAN GROUP DMEGC JOINT-STOCK Co.,Ltd. Registration number: Y2022330001024 |
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