CN102902132A - Automatic focusing method and device - Google Patents
Automatic focusing method and device Download PDFInfo
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- CN102902132A CN102902132A CN2012104248492A CN201210424849A CN102902132A CN 102902132 A CN102902132 A CN 102902132A CN 2012104248492 A CN2012104248492 A CN 2012104248492A CN 201210424849 A CN201210424849 A CN 201210424849A CN 102902132 A CN102902132 A CN 102902132A
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Abstract
The invention relates to an automatic focusing method and device. The method comprises the following steps of: detecting the position of a camera and judging the orientation of the camera; step (2): judging whether the orientation of the camera is downward or not, if so, moving a lens to the position which is farthest away from an imaging device, otherwise, moving the lens to the position which is closest to the imaging device; and finally implementing automatic focusing. The better initial position of the lens can be automatically identified during the automatic focusing process and the automatic focusing time can be shortened by implementing the automatic focusing method and device, disclosed by the invention.
Description
Technical field
The present invention relates to the shooting field, more particularly, relate to a kind of Atomatic focusing method and device.
Background technology
Present camera head generally is the position that changes lens by stepper motor, by the contrast of comparison imaging under diverse location, on the suitable position that determines whether to focus when automatically focusing.Namely after the contrast of obtaining reached maximal value, stepper motor is mobile 2 ~ 3 steps again, if all little than current maximal value, so just think that current location is exactly focusing.
But in general focus process; what adopt is focus from distal-most end to most proximal end (perhaps opposite); the problem of overlong time but focusing usually can appear in this mode: need to be when nearer end is focused; lens begin mobile (or opposite situation) from distal-most end, will certainly prolong like this time of whole automatic focusing.
Be badly in need of now a kind ofly can automatically select to focus the time, step motor drives the method that lens begin to focus from correct position.
Summary of the invention
Problem to be solved by this invention is that step motor driving lens begin focusing in the Atomatic focusing method from inappropriate position for having now, cause the defective of focusing overlong time, and a kind of fast Atomatic focusing method is provided.
Solution of the above problems of the present invention is: a kind of Atomatic focusing method is provided, may further comprise the steps:
Step 1, detect camera position, judge camera towards;
Step 2, judge the downward towards whether of camera, if then execution in step 3, otherwise execution in step 4;
Step 3, lens move to away from the position of image device, and execution in step 5 again;
Step 4, lens move near the position of image device, and execution in step 5 again;
Automatically focusing of step 5, execution.
Atomatic focusing method of the present invention, wherein step 5 comprises:
Lens are to an other end stepping, and detect the picture contrast at image device place in lens stepping process;
Lens move to the position of picture contrast maximum.
The present invention also provides a kind of automatic focusing mechanism, comprising:
Image device and camera, the optical axis coincidence of image device and camera, camera comprises lens; Automatic focusing mechanism also comprises with camera and is fixedly connected with angle detection device, the motor that is fixedly connected with camera;
Angle detection device detect camera towards;
If angle detection device detect camera towards being tilted to down, away from the position of image device, mobile lens is to focusing position more extremely for the motor removing lens;
If angle detection device detect camera towards level or be tilted to, near the position of image device, mobile lens is to focusing position again to for the motor removing lens.
Automatic focusing mechanism of the present invention also comprises the Analysis of Contrast instrument that is connected with image device, is used for detecting in lens stepping process the picture contrast at image device place; The driven by motor lens move to the position of picture contrast maximum.
Automatic focusing mechanism of the present invention, motor are voice coil motor.
Automatic focusing mechanism of the present invention, angle detection device comprise interconnective gyroscope and electromagnetic sensor.
Implement Atomatic focusing method of the present invention and device, can automatically identify the better reference position of lens in the auto-focus process, shorten the automatically time of focusing.
Description of drawings
The present invention will be described below in conjunction with accompanying drawing, wherein:
Fig. 1 is the process flow diagram of Atomatic focusing method of the present invention;
Fig. 2 is the structural representation of automatic focusing mechanism of the present invention.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is the process flow diagram of Atomatic focusing method of the present invention.Existing Atomatic focusing method normally selects the reference position (for example near image device or away from image device) of a limit then to the other end mobile imaging lens imaging len, then lens are stopped on the position of imaging the best, such focus process rigid mechanical, the present invention is that nearly burnt object or burnt object far away carry out discriminatory analysis to the image of imaging at first then, reduces the automatically time of focusing.
At first execution in step 1, judge camera towards, in the present invention with camera towards being divided three classes: camera lens down, camera lens level and camera lens up.The catotropic situation of mirror is generally taken a crane shot, and the object that is lower than camera installation on the locus is taken; The camera lens level is general vista shot, and camera lens is up for facing upward bat.
Step 2: according to the detection of step 1, camera is divided into two classes: down with not down two kinds, and alignment is processed respectively.This is when considering that camera lens down, and thumping majority is to carry out in-plant shooting, is fit to carry out nearly burnt the processing.When camera lens down the time, enter step 3, otherwise execution in step 4.
Step 3: when judging that camera lens down, the imaging len in the camera is moved on the position away from image device.Universal law according to lens imaging:
Wherein, f is the focal length of imaging len, u is object distance (being that shot object is to the distance of lens), v is image distance (being the distance of imaging device and imaging len), in the time of on the imaging len in the camera moves to away from the position of image device, the numerical value of u is the maximal value in the optional scope, the v value minimum that this moment is corresponding.Namely take for nearly burnt object this moment.
Judging that camera lens is not down the time, execution in step 4: the imaging len in the camera is moved on the position near image device.In the time of on the imaging len in the camera moves near the position of image device, the numerical value of u is the minimum value in the optional scope, the v value maximum that this moment is corresponding.Namely take for burnt object far away this moment.
After completing steps 3 or 4, execution in step 5 is carried out automatically focusing.Automatically the process of focusing is, drives imaging len in the mode of stepping, the relatively imaging on diverse location, and stop in position the most clearly, this position be the optimum position of automatically focusing.
Owing to carrying out different automatic focusing reference positions to taking nearly burnt object with burnt object far away, so that the whole step distance of lens reduces, having improved the speed of automatic focusing.
Be illustrated in figure 2 as the device that uses Atomatic focusing method of the present invention.The especially applicable mobile phone with camera function of this device.This device comprises image device 300 and camera, and the critical piece in the camera is imaging len 100, and image device 300 can be selected CCD(Charge Coupled Device), cmos camera etc.; Image device 300 is positioned on the same optical axis 600 with imaging len 100.Imaging len 100 is driven by a motor 200, moves along optical axis 600, and mobile scope is the position between 2 of A, the B among Fig. 2.
In the present embodiment, automatic focusing mechanism comprises one for detection of the angle detection device 400 of automatic focusing mechanism heeling condition, and general present smart mobile phone all includes this assembly (for example the gyroscope take the MEMS chip as core and corresponding electromagnetic sensor cooperatively interact work).Angle detection device 400 is connected with motor 200, and motor 200 is regulated the initial focusing position of imaging len 100 according to the testing result of angle detection device 400.Need to prove, in automatic focusing mechanism of the present invention, angle detection device 400 can be fixed on the optional position (for example being fixed on the inner space of smart mobile phone) of automatic focusing mechanism, as long as angle detection device 400 can detect the inclination situation of imaging len 100, motor 200 is done corresponding motion according to this inclination situation and is got final product.
Automatic focusing mechanism also comprises an Analysis of Contrast instrument 500 that is connected with image device 300, be used for to analyze the contrast of the image that image device 300 collects.
The operational process of this device is as follows: at first, angle detection device 400 is analyzed the inclination situation of automatic focusing mechanism, when camera is tilted to lower (locus that namely A is ordered among the figure is higher than the B point), motor 200 drives imaging lens and moves on the position away from image device 300, i.e. the point of B among the figure; Otherwise, not being tilted to lower time (locus that namely A is ordered among the figure is not higher than the B point) at camera, motor 200 drives imaging lens and moves on the position near image device 300, i.e. the point of A among the figure.
After moving to initial position, motor 200 drive imaging lens 100 from A to B(or from B to A, depend on initial position and change) stepping moves.Usually, be the distance between AB to be waited be divided into 1024 parts, the distance that each stepping is 1 part.Every stepping portion apart from the time, image device 300 gathers an image, and image is sent to the contrast of Analysis of Contrast instrument 500 detected image, motor 200 is urged to imaging len 100 on the position that obtains high-contrast image, finishes automatic focusing.
Because when nearly burnt object is taken, the optimum position of imaging len 100 is relatively near the B point, therefore than beginning driving from A point, the time loss that begins to drive from the B point still less, the speed of finishing automatic focusing is higher.
Preferably, in the present embodiment, motor 200 is voice coil motor (Voice Coil Motor), voice coil motor by with the work that cooperatively interacts of suitable control, feedback system, can realize high-precision step-wise displacement.
Preferably, in the present embodiment, Analysis of Contrast instrument 500 is included in the image processing system (ImageSignal Processing, ISP), and image processing system is processed the image in the shooting process by integrated or external mode.
It below only is the specific embodiment of the invention, can not limit scope of the present invention with this, the equalization that those skilled in the art in the art do according to this creation changes, and the change known of those skilled in that art, all should still belong to the scope that the present invention is contained.
Claims (6)
1. an Atomatic focusing method is characterized in that, may further comprise the steps:
Step 1, detect camera position, judge camera towards;
Step 2, judge the downward towards whether of camera, if then execution in step 3, otherwise execution in step 4;
Step 3, lens move to away from the position of image device, and execution in step 5 again;
Step 4, lens move near the position of image device, and execution in step 5 again;
Automatically focusing of step 5, execution.
2. Atomatic focusing method according to claim 1 is characterized in that, described step 5 comprises:
Lens are to an other end stepping, and detect the picture contrast at image device place in lens stepping process;
Lens move to the position of picture contrast maximum.
3. an automatic focusing mechanism is characterized in that, described automatic focusing mechanism comprises:
Image device (300) and camera, the optical axis coincidence of image device (300) and camera, camera comprises lens (100); Automatic focusing mechanism also comprises angle detection device (400), and the motor that is fixedly connected with camera (200);
Angle detection device (400) detect camera towards;
If angle detection device (400) detect camera towards being tilted to down, away from the position of image device (300), mobile lens is to focusing position more extremely for motor (200) mobile lens;
If angle detection device (400) detect camera towards level or be tilted to, near the position of image device (300), mobile lens is to focusing position again to for motor (200) mobile lens (100).
4. automatic focusing mechanism according to claim 3 is characterized in that, automatic focusing mechanism also comprises the Analysis of Contrast instrument (500) that is connected with image device (100), is used for detecting in lens stepping process the picture contrast at image device place; Motor (200) drive lens (100) moves to the position of picture contrast maximum.
5. according to claim 3 or 4 described automatic focusing mechanisms, it is characterized in that, described motor (200) is voice coil motor.
6. according to claim 3 or 4 described automatic focusing mechanisms, it is characterized in that, described angle detection device (400) comprises interconnective gyroscope and electromagnetic sensor.
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| CN2012104248492A CN102902132A (en) | 2012-10-30 | 2012-10-30 | Automatic focusing method and device |
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| CN2012104248492A CN102902132A (en) | 2012-10-30 | 2012-10-30 | Automatic focusing method and device |
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| CN103064231A (en) * | 2013-02-01 | 2013-04-24 | 信利光电(汕尾)有限公司 | Mobile equipment focusing method and device and mobile equipment |
| CN104038692A (en) * | 2014-04-28 | 2014-09-10 | 深圳英飞拓科技股份有限公司 | Camera back-focus adjustment method and camera back-focus adjustment device |
| CN104202527A (en) * | 2014-09-17 | 2014-12-10 | 广州三星通信技术研究有限公司 | Method and equipment for adjusting lens of portable terminals |
| CN105446055A (en) * | 2014-06-16 | 2016-03-30 | 南昌欧菲光电技术有限公司 | Camera module group and focusing method therefor |
| CN106131415A (en) * | 2016-07-19 | 2016-11-16 | 广东欧珀移动通信有限公司 | Image in 2 D code scan method, device and mobile terminal |
| CN108124098A (en) * | 2016-11-29 | 2018-06-05 | 三星电子株式会社 | Electronic equipment and the method for focusing on automatically |
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