CN105657238B - Track focusing method and device - Google Patents
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- CN105657238B CN105657238B CN201410669930.6A CN201410669930A CN105657238B CN 105657238 B CN105657238 B CN 105657238B CN 201410669930 A CN201410669930 A CN 201410669930A CN 105657238 B CN105657238 B CN 105657238B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
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Abstract
Focusing method is tracked the embodiment of the invention discloses one kind, including：Tracking target is obtained successively includes target following region in picture frame, described image frame；Calculate the changing value of the size parameter in the target following region and the changing value of focusing evaluation of estimate；Revolution step-length is calculated according to the size parameter changing value and focusing evaluation of estimate changing value；Motor control command is generated according to the revolution step-length to be focused.Focusing mechanism is tracked the embodiment of the invention also discloses one kind.Using the present invention, the speed of auto-focusing can be accelerated, reduce the shake of picture.
Description
Technical field
The present invention relates to camera technique field, more particularly to a kind of tracking focusing method and device.
Background technology
Target following is led on the optical imaging apparatus such as existing digital camera, video camera, mobile phone camera and monitoring device
The One function often possessed.User, can be on the display screen of camera or the monitor of monitoring device when being taken pictures or being imaged
See the picture frame of the What You See Is What You Get of its camera imaging formation, user can delimit rectangle tracing area (i.e. on picture frame
Tracking box, using solid border as mark generally in picture frame, user is pointed out by framing foreground image), camera or monitoring
Equipment can be tracked to the foreground image in the rectangle tracing area, and rectangle tracing area can obtain picture frame in imaging
In followed by the left and right of foreground image and move up and down and move, or followed by foreground image amplify apart from the distance of camera lens and
Reduce.
When carrying out target following, in addition it is also necessary to carry out auto-focusing apart from the far and near of camera lens according to target object, otherwise mesh
Mark object will thicken.However, the focusing in conventional art when carrying out target following uses the modes such as climbing algorithm,
Speed of focusing is slower, and influence shoots experience.
The content of the invention
Based on this, in order to solve the slow-footed technical problem of above-mentioned focusing, spy provides a kind of tracking focusing method.
One kind tracking focusing method, including：
Tracking target is obtained successively includes target following region in picture frame, described image frame；
Calculate the changing value of the size parameter in the target following region and the changing value of focusing evaluation of estimate；
Revolution step-length is calculated according to the size parameter changing value and focusing evaluation of estimate changing value；
Motor control command is generated according to the revolution step-length to be focused.
In one of the embodiments, the changing value of the size parameter for calculating the target following region and focusing are commented
The step of changing value of value is：
The size parameter and its changing value in target following region are calculated according to target tracking algorism；
The focusing evaluation of estimate and its changing value of picture frame are calculated according to focusing evaluation function.
In one of the embodiments, it is described that horse is calculated according to the size parameter changing value and focusing evaluation of estimate changing value
Up to rotate step-length the step of be：
According to formula：
Calculate the revolution step-length；Wherein M is revolution step-length, and ▽ fv are the changing value of focusing evaluation of estimate, ▽
Dx is the changing value of the size parameter in target following region, and k is default coefficient, and the direction point of the revolution step-length M
Dui Ying not closely burnt end and remote burnt end.
In one of the embodiments, it is described to generate what motor control command was focused according to the revolution step-length
Also include after step：
Tracking judges whether the focusing evaluation of estimate reached extreme value, if so, then generation continues to move to the horse of-M/2 step-lengths
Focusing fine setting is carried out up to control instruction.
In one of the embodiments, it is described to generate what motor control command was focused according to the revolution step-length
Also include after step：
Judge whether to focus successfully, if so, then obtaining motor focus point position SfocusFocus point position is in motor position
Put SfocusWhen target following region size parameter fvfocus；
Methods described also includes：
Tracking calculates the size parameter fv in target following regiontracking, according to formula：
Calculate motor with burnt position Stracking, according to burnt position StrackingMotor control command is generated, motor is controlled
It is moved to burnt position Stracking。
Correspondingly, in order to solve the slow-footed technical problem of above-mentioned focusing, spy provides a kind of tracking focusing mechanism.
One kind tracking focusing mechanism, including：
Target tracking module, is obtained in picture frame, described image frame comprising target following region successively for tracking target；
Parameter calculating module, changing value and focusing evaluation of estimate for the size parameter that calculates the target following region
Changing value；
Step size computation module is rotated, for calculating motor according to the size parameter changing value and focusing evaluation of estimate changing value
Rotate step-length；
Motor control module, is focused for generating motor control command according to the revolution step-length.
In one of the embodiments, the parameter calculating module is additionally operable to calculate target following according to target tracking algorism
The size parameter and its changing value in region；The focusing evaluation of estimate and its changing value of picture frame are calculated according to focusing evaluation function.
In one of the embodiments, the rotation step size computation module is additionally operable to according to formula：
Calculate the revolution step-length；Wherein M is revolution step-length, and ▽ fv are the changing value of focusing evaluation of estimate, ▽
Dx is the changing value of the size parameter in target following region, and k is default coefficient, and the direction point of the revolution step-length M
Dui Ying not closely burnt end and remote burnt end.
In one of the embodiments, described device also is used to track including fine setting module judges that the focusing evaluation of estimate is
It is no to reach extreme value, if so, then generation continues to move to the motor control command progress focusing fine setting of-M/2 step-lengths.
In one of the embodiments, described device also includes with burnt module, for judging whether to focus successfully, if so,
Then obtain motor focus point position SfocusFocus point position S is in motor positionfocusWhen target following region size ginseng
Number fvfocus；
Tracking calculates the size parameter fv in target following regiontracking, according to formula：
Calculate motor with burnt position Stracking, according to burnt position StrackingMotor control command is generated, motor is controlled
It is moved to burnt position Stracking。
Implement the embodiment of the present invention, will have the advantages that：
Above-mentioned tracking focusing method and device target following and focusing evaluate on the basis of by simple computation target with
The size parameter and its changing value in track region are to complete focusing, and amount of calculation is small, is quick on the draw, so as to accelerate focusing speed.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of flow chart for tracking focusing method in one embodiment；
Fig. 2 be an application scenarios in shoot surface chart；
Fig. 3 be an application scenarios in shoot surface chart；
Fig. 4 be an application scenarios in shoot surface chart；
Fig. 5 is camera lens light path schematic diagram in one embodiment；
Fig. 6 is a kind of structural representation for tracking focusing mechanism in one embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
For the convenience that solves aforesaid operations it is not enough the problem of, spy proposes a kind of tracking focusing method, and this method is held
Row is depended on computer program, the computer system that can run on von Neumann system.The computer program can be integrated in
In, it can also be run as independent tool-class application.The computer system can be digital camera, with camera function
The mobile devices such as smart mobile phone, tablet personal computer, monitor or monitoring device with varifocal camera etc..
Specifically, in the present embodiment, this method as shown in figure 1, including：
Step S102, tracking target is obtained successively includes target following region in picture frame, picture frame.
The picture frame that obtains successively of tracking target is in camera or to be taken the photograph in the target and its surrounding scene as subject
As being imaged obtained image in head, it is cached in the form of frames.Target following region is display screen of the user in camera
Or the target area as subject delimited on monitor screen picture frame.
For example, as shown in Fig. 2 user enters camera function with mobile phone, then mobile phone camera is opened, the corresponding road of its optics
Road scene is to generate picture frame by the imaging of mobile phone camera, and is shown on a display of the handset, forms What You See Is What You Get
Experience of taking pictures.If user wish to focus to some pedestrian in the road scene (will the pedestrian as shooting Jiao
Point), then can the pedestrian on a display screen regional assignment tracking box (rectangle frame in such as Fig. 2), the pedestrian is existed as target
Confined in picture frame, the tracking box of the delimitation is initial target following region.
In upper example, delimit display screen on picture frame in pedestrian target as tracking target after, due to pedestrian
It is kept in motion, therefore it is in variable condition the distance between with camera, it is near when immediately remote.Can using target tracking algorism
The movement of target is tracked, when pedestrian target is moved to camera lens, according to optical imaging concept, as shown in figure 3, then target following area
Domain can amplify along with pedestrian target to the displacement of camera lens；When pedestrian target is away from camera lens, according to optical imaging concept,
As shown in figure 4, then target following region can reduce along with pedestrian target away from the displacement of camera lens.Therefore initial mesh
Mark tracing area after delimitation, can produce the change of size along with movement of the tracking target on lens axis direction.
In the present embodiment, can using target tracking algorism carry out target following when, periodically (such as 30ms) it is raw
Into picture frame, display reflects the moving process of tracking target on a display screen.It is preferred that, target tracking algorism can be used
MeanShift track algorithms, the track algorithm based on particle group optimizing, the track algorithm based on template matches or TLD targets with
Track algorithm etc..
Step S104, calculates the changing value of the size parameter in target following region and the changing value of focusing evaluation of estimate.
The size parameter in target following region is the one-dimensional linear parameter for characterizing target following area size.As above in example,
If target following region is tracking box, its size parameter can select its length or the one-dimensional linear parameter of width, if target
Tracing area is circle, then its size parameter can select the one-dimensional linear parameter such as its radius or diameter, if target following region is
Irregular figure, because target following region is always zoomed in or out in picture frame into grade ratio, then can select diagonal, specific
The one-dimensional linear such as wire length of angle parameter is used as its size parameter.
As previously described, because when carrying out target following, the picture frame of several reflection target locations can be periodically generated,
Therefore the size parameter and its changing value in target following region can be calculated according to target tracking algorism, i.e., when generating picture frame,
The size parameter in the target following region in each image frame is got, then is passed through
▽ dx=dxcurrent-dxpre
The size parameter in target following region in each image frame is obtained relative to the target following area in previous frame image
The changing value ▽ dx (dx of the size parameter in domaincurrentAnd dxpreRespectively the size of current frame image and previous frame image is joined
Number).
Such as Fig. 3 and Fig. 4 are reflected as the movement of pedestrian target continuously generates two field pictures, then can be unified with image
Tracking box height as size parameter, subtracted each other, you can obtain generate Fig. 4 shown in picture frame when target following area
The changing value of the size parameter in domain.
Focusing evaluation of estimate is a judge value of image definition in focus process, and focusing evaluation of estimate is in phase in target
Extreme value is in during the focal position of machine camera lens, now the imaging of camera lens is the most clear, and along with target and camera lens
Focal position distance change, focusing evaluation of estimate be also accordingly changed, so as to reflect picture frame in focus process
Readability.
In the present embodiment, obtained by focusing evaluation function, for example, when generating picture frame, can be according to shade of gray
Function (gray scale fluctuation and change function, gray scale absolute change function, Laplace function gradient function etc.), information mathematic(al) function, frequency
The focusing evaluation functions such as domain function obtain evaluation of estimate of focusing, then pass through
▽ fv=fvcurrent-fvpre
Obtain changing value ▽ fv (fv of each image frame relative to the focusing evaluation of estimate of previous frame imagecurrentAnd fvpre
The respectively focusing evaluation of estimate of current frame image and previous frame image).
Step S106, revolution step-length is calculated according to the changing value of the changing value of size parameter and focusing evaluation of estimate.
The distance between lens set of camera lens can be adjusted during digital camera focusing by motor, so as to focus.Therefore,
The focal length variations of camera lens relation proportional to the rotation step-length of motor.Pass through the changing value and focusing evaluation of estimate of size parameter
Changing value determine the rotation step-length of motor, that is, mean to adjust the focal length of camera lens.
In the present embodiment, it can be calculated according to the proportionate relationship of the changing value and the changing value of focusing evaluation of estimate of size parameter
Revolution step-length.For example, can be according to formula：
Calculate revolution step-length；Wherein M is revolution step-length, and ▽ fv are the changing value of focusing evaluation of estimate, and ▽ dx are
The changing value of the size parameter in target following region, k is default coefficient, and revolution step-length M direction is corresponding near respectively
Burnt end and remote burnt end.That is, M for just or it is negative when, the different moving direction in nearly burnt end and remote Jiao end has been corresponded to respectively, has been had
The corresponding relation of body can be then adjusted according to k.
Step S108, generates motor control command according to revolution step-length and is focused.
Calculating is obtained after revolution step-length, you can call the driver of the motor of camera lens, is obtained with the calculating
Revolution step-length for parameter generate motor control command, the motor apparatus of camera lens is after the instruction is received, you can
Rotate corresponding step-length and complete focusing.
It is preferred that, in focus process, can also focusing be finely adjusted.Specifically, being generated according to revolution step-length
Also include after the step of motor control command is focused：Tracking judges whether focusing evaluation of estimate reached extreme value, if so, then
The motor control command that generation continues to move to-M/2 step-lengths carries out focusing fine setting.
If for example, obtained focusing evaluation of estimate after the foregoing specified step-length M of revolution, will be recalculated less than (selected
The situation when extreme value that focusing evaluation function is used is maximum, if the use of extreme value being that minimum value is then opposite) movement
The focusing evaluation of estimate that preceding calculating is obtained, then show that focusing evaluation of estimate lives through extreme value (due to abovementioned steps in moving process
The revolution step-length that S106 is calculated always makes focus be moved to target, and focusing evaluation of estimate always changes towards extreme value, if occurring
Focusing evaluation of estimate do not increase it is counter subtract, necessarily cause focus to be moved across target for revolution step-length is excessive so that focus
Evaluation of estimate also experienced extreme value accordingly).Now, it can be finely adjusted by rotation motor-M/2 step-lengths (reverse movement).
Performed it should be noted that the process of the fine setting is repeatable, until the difference of focusing evaluation of estimate and extreme value is less than threshold
Value.If for example, motor position is S before focusing1, to defocused for S2, then fine setting can move-M/2 step-lengths and move-(S2-S1)/2
Step-length, reach S3Position, if during this, still tracking judgement obtains focusing evaluation of estimate and experienced extreme value, then can move again
Dynamic-M/2 step-lengths (now M be previous movement-(S2-S1The step-length of)/2), that is, it is moved to-(S3-S2The step-length of)/2, with this
Analogize, until the difference of focusing evaluation of estimate and extreme value is less than threshold value, so as to complete focusing.
In the present embodiment, it after the completion of focusing, will shift focus to after tracking position of object, tracking target can also be carried out
With Jiao.Specially：
Judge whether to focus successfully, if so, then obtaining motor focus point position SfocusFocus point position is in motor position
Put SfocusWhen target following region size parameter dxfocus；
Methods described also includes：
Tracking calculates the size parameter dx in target following regiontracking, according to formula：
Calculate motor with burnt position Stracking, according to burnt position StrackingMotor control command is generated, motor is controlled
It is moved to burnt position Stracking。
As shown in Fig. 5 index path, after focusing successfully, the size parameter in focal length and target following region is then inversely proportional pass
System, therefore can be carried out according to the relation with Jiao, and carry out repeating focusing without computing repeatedly moving step length.
In one embodiment, as shown in fig. 6, a kind of track focusing mechanism, including target tracking module 102, parameter meter
Calculate module 104, rotate step size computation module 106 and motor control module 108, wherein：
Target tracking module 102, is obtained in picture frame, described image frame comprising target following area successively for tracking target
Domain.；
Parameter calculating module 104, is evaluated for calculating the changing value of size parameter in the target following region with focusing
The changing value of value.
Step size computation module 106 is rotated, for being calculated according to the size parameter changing value and focusing evaluation of estimate changing value
Revolution step-length.
Motor control module 108, is focused for generating motor control command according to the revolution step-length.
In the present embodiment, parameter calculating module 104 is additionally operable to calculate target following region according to target tracking algorism
Size parameter and its changing value；The focusing evaluation of estimate and its changing value of picture frame are calculated according to focusing evaluation function.
In the present embodiment, step size computation module 106 is rotated to be additionally operable to according to formula：
Calculate the revolution step-length；Wherein M is revolution step-length, and ▽ fv are the changing value of focusing evaluation of estimate, ▽
Dx is the changing value of the size parameter in target following region, and k is default coefficient, and the direction point of the revolution step-length M
Dui Ying not closely burnt end and remote burnt end.
In the present embodiment, as shown in fig. 6, tracking focusing mechanism also includes fine setting module 110, judge described for tracking
Focusing evaluation of estimate whether reached extreme value, if so, then generation continue to move to-M/2 step-lengths motor control command carry out focusing it is micro-
Adjust.
In the present embodiment, as shown in fig. 6, tracking focusing mechanism device also includes with burnt module 112, for judging whether
Focus successfully, if so, then obtaining motor focus point position SfocusFocus point position S is in motor positionfocusWhen target with
The size parameter dx in track regionfocus；
Tracking calculates the size parameter dx in target following regiontracking, according to formula：
Calculate motor with burnt position Stracking, according to burnt position StrackingMotor control command is generated, motor is controlled
It is moved to burnt position Stracking。
In summary, implement the embodiment of the present invention, will have the advantages that：
Above-mentioned tracking focusing method and device target following and focusing evaluate on the basis of by simple computation target with
The size parameter and its changing value in track region are to complete focusing, and amount of calculation is small, is quick on the draw, so as to accelerate focusing speed.
One of ordinary skill in the art will appreciate that realize all or part of flow in above-described embodiment method, being can be with
The hardware of correlation is instructed to complete by computer program, described program can be stored in a computer read/write memory medium
In, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
Above disclosure is only preferred embodiment of present invention, can not limit the right model of the present invention with this certainly
Enclose, therefore the equivalent variations made according to the claims in the present invention, still belong to the scope that the present invention is covered.
Claims (8)
1. one kind tracking focusing method, including：
Tracking target is obtained successively includes target following region in picture frame, described image frame；
Calculate the changing value of the size parameter in the target following region and the changing value of focusing evaluation of estimate；
Revolution step-length is calculated according to the size parameter changing value and focusing evaluation of estimate changing value；
Motor control command is generated according to the revolution step-length to be focused；
Wherein, the changing value according to the size parameter and the changing value of focusing evaluation of estimate calculate the step of revolution step-length
Suddenly it is：
According to formula：
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<mi>k</mi>
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<mi>v</mi>
</mrow>
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<mo>&dtri;</mo>
<mi>d</mi>
<mi>x</mi>
</mrow>
</mfrac>
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Calculate the revolution step-length；Wherein M is revolution step-length,For focus evaluation of estimate changing value,For mesh
The changing value of the size parameter of tracing area is marked, k is default coefficient, and the direction of the revolution step-length M corresponds to respectively
Nearly Jiao end and remote burnt end.
2. tracking focusing method according to claim 1, it is characterised in that the calculating target following region it is big
The step of changing value of small parameter and the changing value of focusing evaluation of estimate is：
The size parameter and its changing value in target following region are calculated according to target tracking algorism；
The focusing evaluation of estimate and its changing value of picture frame are calculated according to focusing evaluation function.
3. tracking focusing method according to claim 1, it is characterised in that described to be generated according to the revolution step-length
Also include after the step of motor control command is focused：
Tracking judges whether the focusing evaluation of estimate reached extreme value, if so, then generation continues to move to the motor control of-M/2 step-lengths
System instruction carries out focusing fine setting.
4. tracking focusing method according to claim 1, it is characterised in that described to be generated according to the revolution step-length
Also include after the step of motor control command is focused：
Judge whether to focus successfully, if so, then obtaining motor focus point position SfocusFocus point position is in motor position
SfocusWhen target following region size parameter dxfocus；
Methods described also includes：
Tracking calculates the size parameter dx in target following regiontracking, according to formula：
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Calculate motor with burnt position Stracking, according to burnt position StrackingGenerate motor control command, control motor movement
To with burnt position Stracking。
5. one kind tracking focusing mechanism, it is characterised in that including：
Target tracking module, is obtained in picture frame, described image frame comprising target following region successively for tracking target；
Parameter calculating module, for calculate the target following region size parameter changing value and focusing evaluation of estimate change
Value；
Step size computation module is rotated, for calculating revolution according to the size parameter changing value and focusing evaluation of estimate changing value
Step-length；
Motor control module, is focused for generating motor control command according to the revolution step-length；
Wherein, the rotation step size computation module is additionally operable to according to formula：
<mrow>
<mi>M</mi>
<mo>=</mo>
<mi>k</mi>
<mo>&times;</mo>
<mfrac>
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</mrow>
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</mrow>
</mfrac>
</mrow>
Calculate the revolution step-length；Wherein M is revolution step-length,For focus evaluation of estimate changing value,For mesh
The changing value of the size parameter of tracing area is marked, k is default coefficient, and the direction of the revolution step-length M corresponds to respectively
Nearly Jiao end and remote burnt end.
6. tracking focusing mechanism according to claim 5, it is characterised in that the parameter calculating module is additionally operable to according to mesh
Mark size parameter and its changing value that track algorithm calculates target following region；Pair of picture frame is calculated according to focusing evaluation function
Burnt evaluation of estimate and its changing value.
7. tracking focusing mechanism according to claim 5, it is characterised in that described device also include fine setting module be used for
Track judges whether the focusing evaluation of estimate reached extreme value, if so, then generation continues to move to the motor control command of-M/2 step-lengths
Carry out focusing fine setting.
8. tracking focusing mechanism according to claim 5, it is characterised in that described device also includes with burnt module, is used for
Judge whether to focus successfully, if so, then obtaining motor focus point position SfocusFocus point position S is in motor positionfocusWhen
Target following region size parameter dxfocus；
Tracking calculates the size parameter dx in target following regiontracking, according to formula：
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Calculate motor with burnt position Stracking, according to burnt position StrackingGenerate motor control command, control motor movement
To with burnt position Stracking。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410669930.6A CN105657238B (en) | 2014-11-20 | 2014-11-20 | Track focusing method and device |
| CN201710848389.9A CN107465877B (en) | 2014-11-20 | 2014-11-20 | Track focusing method and device and related media production |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107465877A (en) * | 2014-11-20 | 2017-12-12 | 广东欧珀移动通信有限公司 | Track focusing method and device and related media production |
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| CN107918278B (en) * | 2017-11-16 | 2021-01-19 | 江苏省生产力促进中心 | Automatic focus following method for film and television lens |
| CN108702456A (en) * | 2017-11-30 | 2018-10-23 | 深圳市大疆创新科技有限公司 | A kind of focusing method, equipment and readable storage medium storing program for executing |
| CN111050060B (en) | 2018-10-12 | 2021-08-31 | 华为技术有限公司 | Focusing method and device applied to terminal equipment and terminal equipment |
| CN109460764B (en) * | 2018-11-08 | 2022-02-18 | 中南大学 | Satellite video ship monitoring method combining brightness characteristics and improved interframe difference method |
| CN112004019B (en) * | 2019-05-27 | 2023-02-24 | 福建天晴数码有限公司 | Tracking focusing method and computer readable storage medium |
| CN114449152B (en) * | 2020-10-30 | 2023-09-22 | 北京小米移动软件有限公司 | Focusing method, focusing device, electronic equipment and storage medium |
| CN113163114B (en) * | 2021-03-29 | 2023-07-04 | 无锡闻泰信息技术有限公司 | Image focusing method, device, equipment and medium |
| CN114302053B (en) * | 2021-11-24 | 2023-12-05 | 影石创新科技股份有限公司 | Lens focusing method and device of image pickup apparatus, image pickup apparatus and storage medium |
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| CN107465877B (en) * | 2014-11-20 | 2019-07-09 | Oppo广东移动通信有限公司 | Track focusing method and device and related media production |
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| JP2008052225A (en) * | 2006-08-28 | 2008-03-06 | Olympus Imaging Corp | Camera, focus control method, and program |
| CN104012073A (en) * | 2011-12-16 | 2014-08-27 | 奥林巴斯映像株式会社 | Imaging device and imaging method, and storage medium for storing tracking program processable by computer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107465877A (en) * | 2014-11-20 | 2017-12-12 | 广东欧珀移动通信有限公司 | Track focusing method and device and related media production |
| CN107465877B (en) * | 2014-11-20 | 2019-07-09 | Oppo广东移动通信有限公司 | Track focusing method and device and related media production |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107465877A (en) | 2017-12-12 |
| CN107465877B (en) | 2019-07-09 |
| CN105657238A (en) | 2016-06-08 |
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