CN104238237B - The method and test device of auto-focusing - Google Patents
The method and test device of auto-focusing Download PDFInfo
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- CN104238237B CN104238237B CN201310238941.4A CN201310238941A CN104238237B CN 104238237 B CN104238237 B CN 104238237B CN 201310238941 A CN201310238941 A CN 201310238941A CN 104238237 B CN104238237 B CN 104238237B
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Abstract
The present invention provides a kind of method and test device of auto-focusing, the method of the auto-focusing is used to determine the focusing position of camera lens in image acquiring device, the camera lens can be moved by the driving of a voice coil motor relative to an image sensor, the method of the auto-focusing first judges roughly the place of focusing position on a large scale, then in small-scale fine search, until a difference value is more than predetermined value.The Atomatic focusing method of the present invention first judges roughly the place of focusing position on a large scale, then can comparatively fast and accurately determine the focusing position of camera lens by verification experimental verification in small-scale fine search.
Description
Technical field
The present invention relates to a kind of methods of auto-focusing.
Background technology
The camera model for having automatic focusing function is to drive camera lens to change between sensing component using voice coil motor
Relative position so that camera model obtains clear image, and common video recording analysis power analytic function is that letter is transmitted in modulation
Number (modulation transfer function, MTF).
Due to effective mtf value calculate need to be only in best focusing position it is effective and objective, therefore, when seeking burnt position
Time production efficiency will be caused too low too long.Best focusing position, universe search side are searched using universe search pattern at present
Formula is scheduled electric current spacing into line search, and MFT values when calculating different electric currents, and can finally find can be with there are one current value
Keep mtf value maximum.When search spacing is smaller, universe search method will be unable to that producing line is made to obtain preferable production efficiency；If conversely,
Search spacing is excessive, then focus effects are bad.
In order to improve above-mentioned universe search pattern, first with the calculating mtf value one by one of larger search spacing, mtf value is found
When crossing peak value, then change and search direction, and reduces search spacing to recalculate mtf value simultaneously；Above-mentioned steps repeatedly, until
When the peak value that mtf value is crossed no longer changes, then automatic focusing function is completed, but when a little oscillation is presented in MTF curve, then
It is easy to fall into the search result of plots peak, is not universe peak value.
Invention content
In view of this, it is necessary to propose a kind of method of auto-focusing, can solve the above problems.
A kind of method of auto-focusing, the focusing position for determining camera lens in image acquiring device, the camera lens by
The driving of one voice coil motor and can be moved relative to an image sensor, the method for the auto-focusing includes：According to function S=
Lst+ (n-1) * k obtain one group of sampling value, wherein the initial value of Lst is the minimum drive current value of voice coil motor, and n is to be opened from 1
The one group of consecution natural number to begin, k is constant；Successively using the sampling value as the driving current value of voice coil motor, to drive
Camera lens is stated to different positions；The picture in image when being located at the different location according to the camera lens on the image sensor
Maximum gradation value, minimum gradation value and the average gray value of vegetarian refreshments calculate one group of modulation corresponding with each sampling value and pass
Delivery function value；Using one group of modulating transfer function value as variable a variation value is calculated according to scheduled formula；If institute
It states variation value and is less than predetermined value, then then the sum of Lst and k repeat the above steps as new Lst；When the variation value is big
When predetermined value, constant k is replaced with another parameter m, parameter m is less than constant k, repeats the above steps；When the variation value is big
When predetermined value, select a sampling value as opposite with lens focusing position from one group of sampling value according to pre-defined rule
The driving current value for the voice coil motor answered.
A kind of test device, the focusing position for determining camera lens in image acquiring device, the camera lens is by a voice coil
The driving of motor and can be moved relative to an image sensor, the test device includes processor and driving unit, the place
It manages device and one group of sampling value is obtained according to function S=Lst+ (n-1) * k, wherein the initial value of Lst is the simulation of voice coil motor
Current value, n are one group of consecution natural number since 1, and k is constant；Driving unit is successively using the sampling value as voice coil horse
The driving current value reached, to drive the camera lens to different positions；The processor is located at the difference according to the camera lens
Maximum gradation value, minimum gradation value and the average gray value of the pixel in image when position on the image sensor calculate
Go out one group of modulating transfer function value corresponding with each sampling value；The processor is with one group of modulating transfer function value
As variable a variation value is calculated according to scheduled formula；If the variation value is less than predetermined value, the processor will
Then the sum of Lst and k repeat the above steps as new Lst；When the variation value is more than predetermined value, by constant k with another
Parameter m is replaced, and parameter m is less than constant k, repeats the above steps；When the variation value be more than predetermined value when, the processor according to
Pre-defined rule selects a sampling value as voice coil motor corresponding with lens focusing position from one group of sampling value
Driving current value.
The Atomatic focusing method of the present invention first judges roughly the place of focusing position on a large scale, then in small-scale essence
Fine searching can comparatively fast and accurately determine the focusing position of camera lens by verification experimental verification.
Description of the drawings
Fig. 1 is the block diagram of the test device of the present invention.
Fig. 2 is the flow chart of the Atomatic focusing method of the present invention.
Fig. 3 is the modulation transfer function curve of the camera lens of image acquiring device to be tested.
Main element symbol description
Following specific implementation mode will be further illustrated the present invention in conjunction with above-mentioned attached drawing.
Specific implementation mode
Referring to Fig. 1, test device 100 is used to determine an image acquiring device 200 to be tested (such as mobile phone, photograph
Machine) in camera lens 210 focusing position, the camera lens 210 can be relative to an image sensing by the driving of a voice coil motor 220
Device 230 moves.
Referring to Fig. 2, test device 100 includes processor 10, driving unit 20 and memory 30, stored in memory 30
There are test program, processor 10 to execute the focusing position that the test program can determine the camera lens 210.Specifically, the processing
Device 10 obtains one group of sampling value according to function S=Lst+ (n-1) * k, wherein the initial value of Lst is the minimum of voice coil motor 220
Driving current value, n are one group of consecution natural number since 1, and k is constant.
Driving unit 20 is successively using the sampling value as the driving current value of voice coil motor 220, to drive the camera lens
210 to different positions.
In image of the processor 10 when being located at the different location according to the camera lens 210 on the image sensor 230
Maximum gradation value, minimum gradation value and the average gray value of pixel calculate one group of tune corresponding with each sampling value
Modulation trnasfer function value.
The processor 10 calculates a change as variable using one group of modulating transfer function value according to scheduled formula
Different value.
If the variation value is less than predetermined value, the processor 10 as new Lst, then weighs the sum of Lst and k
Multiple above-mentioned steps.
When the variation value is more than predetermined value, constant k is replaced with another parameter m, parameter m is less than constant k, in repetition
State step.
When the variation value is more than predetermined value, the processor 10 is selected according to pre-defined rule from one group of sampling value
Select driving current value of the sampling value as voice coil motor corresponding with 210 focusing position of camera lens 220.
It is specifically described by taking Fig. 3 as an example, since the drive current range of voice coil motor 220 is 0~80mA, sets Lst
Minimum value and maximum value be respectively 0 and 80, set k=10, set n as the consecution natural number from 1 to 3.Also that is, sampling every time
Including 3 sampling values, the spacing between sampling value is 10.When the first sub-sampling, sampling value S is respectively 0,10 and 20, processor
10 calculate modulating transfer function value according to formula MTF=(High-Low)/(High+Low), wherein High=Ave+0.6
(Max-Ave), Low=Ave-0.6 (Ave-Min), Ave are the average gray value of the pixel in image, and Max is in image
The maximum gradation value of pixel, Min are the minimum gradation value of the pixel in image.That is, driving unit 20 respectively with
The driving current of 0mA, 10mA and 20mA drive camera lens 210 to 3 different positions, and then processor 10 is according to above-mentioned 3
Maximum gradation value, minimum gradation value and the average gray value meter of the pixel in image when a position on image sensor 230
Calculate 3 modulating transfer function values.
In the present embodiment, variation value is calculated by the following formula：
Wherein, S=Lst+ (n-1) * k, N indicate the number of sample point
Amount, in the present embodiment, N are equal to ratio of the sum of the mtf value corresponding when 3, Ave systems S is 0,10 and 20 with N, Avri systems S
The ratio of corresponding mtf value and the absolute value and N of the difference of Ave when being 0,10 and 20.
If variation value Avri is less than predetermined value (being in the present embodiment 0.01), continue to sample, i.e. hereafter several
Group sampling value is respectively 10,20,30,20,30,40,30,40,50,40,50,60, when sampling value is 50,60,70, variation value
Avri is more than the predetermined value, indicates that focusing position is located between the position corresponding to driving current value 50mA and 70mA.
Hereafter, the spacing between sampling value is adjusted to m by k, in the present embodiment, m is equal to 1, then repeats above-mentioned
Step is until the value Avri that morphs again is more than the situation of predetermined value.The processor 10 is according to pre-defined rule from described one group
Select a sampling value as the driving current value of voice coil motor corresponding with 210 focusing position of camera lens 220, example in sampling value
Such as, it is voice coil horse corresponding with 210 focusing position of camera lens that the processor 10, which chooses the current value corresponding to maximum mtf value,
Up to 220 driving current value.
The Atomatic focusing method of the present invention first judges roughly the place of focusing position on a large scale, then in small-scale essence
Fine searching can comparatively fast and accurately determine the focusing position of camera lens 210 by verification experimental verification.
Claims (2)
1. a kind of method of auto-focusing, the focusing position for determining camera lens in image acquiring device, the camera lens is by one
The driving of voice coil motor and can be moved relative to an image sensor, the method for the auto-focusing includes：
One group of sampling value is obtained according to function S=Lst+ (n-1) * k, wherein the initial value of Lst is the simulation of voice coil motor
Current value, n are one group of consecution natural number since 1, and k is constant；
Successively using the sampling value as the driving current value of voice coil motor, to drive the camera lens to different positions；
The maximum gray scale of the pixel in image when being located at the different location according to the camera lens on the image sensor
Value, minimum gradation value and average gray value and according to formula：MTF=(High-Low)/(High+Low) calculates one group and institute
State the corresponding modulating transfer function value of each sampling value, wherein High=Ave+0.6 (Max-Ave), Low=Ave-0.6
(Ave-Min), Ave is the average gray value of the pixel in image, and Max is the maximum gradation value of the pixel in image, Min
For the minimum gradation value of the pixel in image；
Using one group of modulating transfer function value as variable according to formula：
A variation value is calculated,
Wherein, S=Lst+ (n-1) * k, N indicate that the quantity of sample point, Avri are variation value；
If then the variation value repeats the above steps less than predetermined value by the sum of Lst and k as new Lst；
When the variation value is more than predetermined value, constant k is replaced with another parameter m, parameter m is less than constant k, repeats above-mentioned step
Suddenly；
When the variation value is more than predetermined value, obtains one group of sampling value according to function S=Lst+ (n-1) * k and taken from described one group
Select a sampling value as the driving current value of voice coil motor corresponding with lens focusing position in sample value, wherein Lst's
Initial value is voice coil motor（220）Minimum drive current value, n is one group of consecution natural number since 1, and k is constant.
2. a kind of test device, the focusing position for determining camera lens in image acquiring device, the camera lens is by a voice coil horse
The driving that reaches and can be moved relative to an image sensor, the test device includes processor and driving unit, and feature exists
In：
The processor obtains one group of sampling value according to function S=Lst+ (n-1) * k, wherein the initial value of Lst is voice coil motor
Minimum drive current value, n is one group of consecution natural number since 1, and k is constant；
Driving unit is successively using the sampling value as the driving current value of voice coil motor, to drive the camera lens to different positions
It sets；
Pixel in image of processor when being located at the different location according to the camera lens on the image sensor
Maximum gradation value, minimum gradation value and average gray value and calculated according to formula MTF=(High-Low)/(High+Low)
One group of modulating transfer function value corresponding with each sampling value, wherein High=Ave+0.6 (Max-Ave), Low=
Ave-0.6 (Ave-Min), Ave are the average gray value of the pixel in image, and Max is the maximum ash of the pixel in image
Angle value, Min are the minimum gradation value of the pixel in image；
The processor is using one group of modulating transfer function value as variable according to formula：
Calculate a variation value, wherein S=Lst+ (n-1) * k, N expressions take
The quantity of sampling point, Avri are variation value；
If the variation value is less than predetermined value, the processor as new Lst, then repeats the sum of Lst and k above-mentioned
Step；
When the variation value is more than predetermined value, constant k is replaced with another parameter m, parameter m is less than constant k, repeats above-mentioned step
Suddenly；
When the variation value is more than predetermined value, the processor according to function S=Lst+ (n-1) * k obtain one group of sampling value from
Select a sampling value as the driving current value of voice coil motor corresponding with lens focusing position in one group of sampling value,
Wherein, the initial value of Lst is voice coil motor（220）Minimum drive current value, n is one group of consecution natural number since 1, k
For constant.
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| CN105681668B (en) * | 2016-02-29 | 2019-02-12 | Oppo广东移动通信有限公司 | Control method, control device and electronic device |
| CN106101697B (en) * | 2016-06-21 | 2017-12-05 | 深圳市辰卓科技有限公司 | Approach for detecting image sharpness, device and test equipment |
| CN111083347B (en) * | 2018-10-22 | 2021-04-20 | 杭州海康威视数字技术股份有限公司 | Lens drive control device, lens drive device and camera |
| CN109714581B (en) * | 2018-12-26 | 2021-04-06 | 深圳市橙子数字科技有限公司 | Automatic focusing method of projector |
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| CN102037241A (en) * | 2008-05-21 | 2011-04-27 | 柯尼卡美能达精密光学株式会社 | Position control device, position control method, drive device and imaging device |
| CN102147556A (en) * | 2011-03-09 | 2011-08-10 | 华为终端有限公司 | Focusing method and device for mobile device and mobile device |
| CN102736361A (en) * | 2011-04-08 | 2012-10-17 | 鸿富锦精密工业（深圳）有限公司 | Automatic focusing method |
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| JP3902492B2 (en) * | 2002-03-13 | 2007-04-04 | 株式会社リコー | Imaging device |
| US8049811B2 (en) * | 2009-01-28 | 2011-11-01 | Board Of Regents, The University Of Texas System | Automatic focusing apparatus and method for digital images using automatic filter switching |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102037241A (en) * | 2008-05-21 | 2011-04-27 | 柯尼卡美能达精密光学株式会社 | Position control device, position control method, drive device and imaging device |
| CN102147556A (en) * | 2011-03-09 | 2011-08-10 | 华为终端有限公司 | Focusing method and device for mobile device and mobile device |
| CN102736361A (en) * | 2011-04-08 | 2012-10-17 | 鸿富锦精密工业（深圳）有限公司 | Automatic focusing method |
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