CN109995982A - A kind of method, apparatus that motor-driven lens focus automatically and video camera - Google Patents
A kind of method, apparatus that motor-driven lens focus automatically and video camera Download PDFInfo
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- CN109995982A CN109995982A CN201711473140.0A CN201711473140A CN109995982A CN 109995982 A CN109995982 A CN 109995982A CN 201711473140 A CN201711473140 A CN 201711473140A CN 109995982 A CN109995982 A CN 109995982A
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- focus
- focusing group
- group position
- presetting bit
- focusing
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
- G03B13/36—Autofocus systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
-
- 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
Abstract
The invention discloses a kind of method, apparatus that motor-driven lens focus automatically and video cameras, default monitoring is recorded as presetting bit focusing group position to defocused focusing group position apart from lower by the method that the motor-driven lens focus automatically, it changes in focus position and again after zoom, focusing group position is adjusted to the presetting bit focusing group position recorded, starts to focus automatically and complete to focus.The inventive system comprises presetting bit management modules and automatic focus module.Method and device of the invention optimizes lens focus stroke, reduces search process, effectively promotes motor-driven lens focusing speed.
Description
Technical field
The invention belongs to apparatus for making a video recording technical field more particularly to a kind of method, apparatus that motor-driven lens focus automatically and
Video camera.
Background technique
In the application of remote safety monitoring (frontier defense, coast defence, forest fire protection etc.), gunlock+motor-driven lens can be used mostly
Scheme, wherein motor-driven lens focal length can reach 500-1500mm, and monitoring covering reaches 3-10km range.
Prior art motor-driven lens all use direct current generator to drive, and the zoom of camera lens and focusing are positive/anti-by load
It is controlled to the time of electric current, can not accomplish accurate step-length and step number, cause auto-focusing algorithm can only be according to image
Variation tendency find best focal point.
In practical applications, a monitoring distance can be generally preset, lens focus and camera back focus are adjusted to most preferably,
Ensure to can be obtained clearest image without focusing in zoom overall process.However, as shown in Figure 1, writing from memory after rear burnt adjustment
Recognize its optimum focusing point B under object distance, but when selecting the monitoring objective of other distances, image needs to focus again (assuming that burnt
Point is in A).When zooming to other focal lengths again at this time, since focusing group remains at A, and A point is possible under current focus
Positioned at focusing curve end, as shown in Fig. 2, far apart from best focal point, focusing group needs more stroke just to have at this time
Best focal point may be searched.
In order to solve the problem above-mentioned, the prior art is controlled using classification current, that is, is increased driving current when search, added
Fast motor speed shortens search duration, after searching out best focal point and determining overshoot, reduces driving current reverse search most
Good focus point, thus shakes repeatedly, until finding optimum position.
However since step-length (speed) and precision have contradiction always, cause control strategy complex.Basic reason is
In the constant situation of total travel, Optimizing Search strategy, improved efficiency is limited, and especially the focusing stroke of telephoto lens is very
It is long, it is effect improved very limited.
Summary of the invention
The object of the present invention is to provide a kind of method, apparatus that motor-driven lens focus automatically and video cameras, existing for solving
Stroke very long problem is focused when having technology to focus again after zoom.
To achieve the goals above, technical solution of the present invention is as follows:
A kind of method that motor-driven lens focus automatically, the method that the motor-driven lens focus automatically, comprising:
Default monitoring is recorded as presetting bit focusing group position to defocused focusing group position apart from lower；
It changes in focus position and again after zoom, focusing group position is adjusted to the presetting bit recorded and is focused
Group position starts to focus automatically and complete to focus.
Further, described that default monitoring is recorded as presetting bit focusing group position to defocused focusing group position apart from lower
It sets, comprising:
According to default monitoring distance, adjusts camera back focus position and be overlapped with rear lens focus point, complete focusing；
Presetting bit focusing group position currently will be recorded as to defocused focusing group position.
Further, the default monitoring distance, is the object distance of monitoring objective in camera supervised scene.
The invention also provides a kind of devices that motor-driven lens focus automatically, are applied to video camera, the motor-driven lens are certainly
The dynamic device focused, comprising:
Presetting bit management module, for default monitoring to be recorded as presetting bit focusing to defocused focusing group position apart from lower
Group position；
Focusing group position is adjusted to by automatic focus module for changing in focus position and again after zoom
The presetting bit focusing group position recorded starts to focus automatically and complete to focus.
Further, the presetting bit management module by it is default monitoring apart from it is lower defocused focusing group position is recorded as it is pre-
Set focusing group position, performs the following operations:
According to default monitoring distance, adjusts camera back focus position and be overlapped with rear lens focus point, complete focusing；
Presetting bit focusing group position currently will be recorded as to defocused focusing group position.
Further, the default monitoring distance, is the object distance of monitoring objective in camera supervised scene.
The invention also provides a kind of video camera, the video camera includes motor-driven lens, the motor-driven lens, comprising:
Presetting bit management module, for default monitoring to be recorded as presetting bit focusing to defocused focusing group position apart from lower
Group position；
Focusing group position is adjusted to by automatic focus module for changing in focus position and again after zoom
The presetting bit focusing group position recorded starts to focus automatically and complete to focus.
Further, the presetting bit management module by it is default monitoring apart from it is lower defocused focusing group position is recorded as it is pre-
Set focusing group position, performs the following operations:
According to default monitoring distance, adjusts camera back focus position and be overlapped with rear lens focus point, complete focusing；
Presetting bit focusing group position currently will be recorded as to defocused focusing group position.
Further, the default monitoring distance, is the object distance of monitoring objective in camera supervised scene.
The method, apparatus and video camera that a kind of motor-driven lens proposed by the present invention focus automatically, by by it is default monitoring away from
Presetting bit focusing group position is recorded as to defocused focusing group position from lower, is changed in focus position and zoom again
Afterwards, focusing group position is adjusted to the presetting bit focusing group position recorded, starts to focus automatically and complete to focus.The present invention is excellent
Lens focus stroke is changed, has reduced search process, effectively promote motor-driven lens focusing speed.
Detailed description of the invention
Fig. 1 is default monitoring apart from lower focusing curve；
Fig. 2 is focusing curve after change focal length；
Fig. 3 is a kind of method flow diagram for improving direct current generator motor-driven lens and focusing automatically of the present invention；
Fig. 4 is video camera motor-driven lens structural schematic diagram of the present invention.
Specific embodiment
Technical solution of the present invention is described in further details with reference to the accompanying drawings and examples, following embodiment is not constituted
Limitation of the invention.
The general thought of the technical program is included curve fitting algorithm, climbs for common automatic focused search algorithm
Mountain algorithm etc. determines whether motor movement direction is reasonable generally by image change rate in the unit of account time, if number
Value obviously increases, then illustrates that current motor is in the right direction, will continue to move to this direction；If be substantially reduced, illustrate motor
Anisotropy, software can control motor counter motion, and synchronous calculating change rate；It, still can edge if changing value is unobvious
When front direction moves, until can just replace motor drive direction after time-out, (since direct current generator is without position feedback, software can not be sentenced
Surely it is the failure to search best focal point and still has arrived at mechanical end).The simple optimization motor control of traditional technical solution
Strategy processed can only reduce concussion number, and the target of the technical program is to reduce stroke, behind camera back focus position,
A focusing group position is obtained, and records this position, it is automatic poly- in triggering when focus position changes and after zoom again
The focusing group position recorded is first called before burnt, search stroke is improved with this, improves focusing speed, so as to improve efficiency.
As shown in figure 3, a kind of embodiment of the technical program, a kind of method that motor-driven lens focus automatically, comprising:
Default monitoring is recorded as presetting bit focusing group position to defocused focusing group position apart from lower；
It changes in focus position and again after zoom, focusing group position is adjusted to the presetting bit recorded and is focused
Group position starts to focus automatically and complete to focus.
Specifically, as shown in figure 4, it includes main control module, automatic focus module, picture signal that video camera, which includes motor-driven lens,
Evaluation module, motor control module and presetting bit management module.
Wherein, main control module dispatches the process that each module executes zoom, focusing, and the size of adjusting parameter.It is automatic to focus
Module adjusts motor control direction by change rate parameter, and motor control module controls camera lens zoom group, focusing group；Figure
As signal evaluation module exports picture appraisal parameter, timing calculating change rate.Unlike the prior art, it also adds preset
Position management module, for recording presetting bit focusing group location information.
The present embodiment camera lens be direct current generator motor-driven lens, refer to and apply in monitoring system, can by remotely control zoom,
The optical lens of focusing.Camera lens includes zoom group and focusing group, and zoom group is made of more pieces of eyeglasses in camera lens, when changing its stroke
Lens focus can change；Focusing group is made of more pieces of eyeglasses in camera lens, and camera lens Focus Club changes when changing its stroke.
When video camera is deployed to monitoring scene, camera back focus position or mirror can be adjusted by preset monitoring distance
Head back focus position, can get clearly monitoring image when camera back focus is overlapped with rear lens focus point, theoretically this time-varying
It can be obtained clearest image without focusing in burnt overall process.The preset monitoring distance of the present embodiment is camera supervised scene
The object distance of middle monitoring objective, under normal circumstances for the video camera motor-driven lens in the application of remote safety monitoring, monitoring
Covering reaches 3-10km range, is approximately equivalent to the object distance of infinity.By above-mentioned adjustment, can obtain lens focus with take the photograph
Corresponding focusing group location information when coke is adjusted to best after camera.
Default monitoring is recorded as presetting bit to defocused focusing group position apart from lower by a kind of embodiment of the technical program
Focusing group position, comprising:
According to default monitoring distance, adjusts camera back focus position and be overlapped with rear lens focus point, complete focusing；
Presetting bit focusing group position currently will be recorded as to defocused focusing group position.
In video camera deployment, adjustable camera back focus, also adjustable rear lens focus point is focused, and works as camera shooting
It can get clearly monitoring image when coke is overlapped with rear lens focus point after machine.The present embodiment is using the focusing group position recorded at this time
For presetting bit focusing group position, the position of record is more accurate, carries out quickly in automatic focused search algorithm convenient for subsequent
It focuses.
It is easily understood that can only generally adjust rear lens focus point after the completion of video camera deployment to be focused.This skill
Art scheme is equally applicable to the deployed video camera finished, and camera back focus position cannot change at this time, only need to be in default prison
Under control distance, after carrying out auto-focusing, record is to defocused focusing group position as presetting bit focusing group position.
The present embodiment record focusing group location information at this time, for changing in focus position and zoom again
Afterwards, the process of auto-focusing is carried out.It is easily understood that in actual monitoring scene, it is sometimes necessary to target object is tracked,
Or when monitoring the object of another object distance as needed, with the variation of object distance, need to focus again.Again to defocused, gather
Coke group location information changes therewith, and best focus position deviates original best focus position on focusing curve, such as
As shown in Figure 1, being displaced to A point from B point.
If after this, video camera needs to zoom in or out target to be monitored, then it is related to zoom, after zoom,
Video camera needs to focus again.Assuming that original focal length is F1, the focusing curve of corresponding diagram 1；After zoom, focal length conjugates F2,
The focusing curve of corresponding diagram 2.It can find that A point is far apart from best focal point D.It is automatic right that this causes conventionally to carry out
The time of Jiao Shi, adjustment are long, and focusing group needs more stroke to be possible to search best focal point, and is searching for
During best focal point, need to vibrate repeatedly.
For this purpose, the present embodiment is first according to default monitoring distance, adjustment camera back focus position is overlapped with rear lens focus point, complete
At focusing, focusing group location information at this time is recorded, such as be recorded in presetting bit management module, be denoted as presetting bit focusing group
Position.
Then, it changes in focus position and again after zoom, focusing group position is adjusted to record preset
Position focusing group position starts to focus automatically and complete to focus.
It is easily understood that changing in focus position and again after zoom, focusing group position is adjusted to remember
Initial position when to start again at auto-focusing is become presetting bit focusing group position by the presetting bit focusing group position of record.
And under different focal length, relatively, focusing group position off-target focal position is not at this time for the best focusing position of focusing curve
Can be too many, no matter motor moves to which direction in this case, and change rate all can be obvious, it is possible thereby to judge rapidly
Correct motor movement direction out, and rapidly converge to best focal point.Focusing group when being considerably reduced focusing again in this way
Stroke and focal time.
The present embodiment technical solution optimizes lens focus stroke, reduces search process, effectively promotes motor-driven lens and focuses
Speed；And the method for the present embodiment can be with any one focusing algorithm combined application, and automatic focused search algorithm includes curve
Fitting algorithm, hill-climbing algorithm etc. can all reach optimum efficiency.
It is corresponding with the above method, the another embodiment of the technical program, it is also proposed that a kind of motor-driven lens focus automatically
Device, be applied to video camera, the device that the motor-driven lens focus automatically, comprising:
Presetting bit management module, for default monitoring to be recorded as presetting bit focusing to defocused focusing group position apart from lower
Group position；
Focusing group position is adjusted to by automatic focus module for changing in focus position and again after zoom
The presetting bit focusing group position recorded starts to focus automatically and complete to focus.
Corresponding, preferably, the presetting bit management module is by default monitoring apart from lower to defocused focusing for the present embodiment
Group position is recorded as presetting bit focusing group position, performs the following operations:
According to default monitoring distance, adjusts camera back focus position and be overlapped with rear lens focus point, complete focusing；
Presetting bit focusing group position currently will be recorded as to defocused focusing group position.
The another embodiment of the technical program, it is also proposed that a kind of video camera, the video camera includes motor-driven lens, described
Motor-driven lens, comprising:
Presetting bit management module, for default monitoring to be recorded as presetting bit focusing to defocused focusing group position apart from lower
Group position；
Focusing group position is adjusted to by automatic focus module for changing in focus position and again after zoom
The presetting bit focusing group position recorded starts to focus automatically and complete to focus.
Preferably, default monitoring is recorded as defocused focusing group position apart from lower the present embodiment by presetting bit management module
Presetting bit focusing group position, performs the following operations:
According to default monitoring distance, adjusts camera back focus position and be overlapped with rear lens focus point, complete focusing；
Presetting bit focusing group position currently will be recorded as to defocused focusing group position.
The above embodiments are merely illustrative of the technical solutions of the present invention rather than is limited, without departing substantially from essence of the invention
In the case where mind and its essence, those skilled in the art make various corresponding changes and change in accordance with the present invention
Shape, but these corresponding changes and modifications all should fall within the scope of protection of the appended claims of the present invention.
Claims (9)
1. a kind of method that motor-driven lens focus automatically, which is characterized in that the method that the motor-driven lens focus automatically, comprising:
Default monitoring is recorded as presetting bit focusing group position to defocused focusing group position apart from lower；
It changes in focus position and again after zoom, focusing group position is adjusted to the presetting bit focusing group position recorded
It sets, starts to focus automatically and complete to focus.
2. the method that motor-driven lens as described in claim 1 focus automatically, which is characterized in that it is described will be under default monitoring distance
Presetting bit focusing group position is recorded as to defocused focusing group position, comprising:
According to default monitoring distance, adjusts camera back focus position and be overlapped with rear lens focus point, complete focusing；
Presetting bit focusing group position currently will be recorded as to defocused focusing group position.
3. the method that motor-driven lens as claimed in claim 1 or 2 focus automatically, which is characterized in that the default monitoring distance,
It is the object distance of monitoring objective in camera supervised scene.
4. a kind of device that motor-driven lens focus automatically is applied to video camera, which is characterized in that the motor-driven lens focus automatically
Device, comprising:
Presetting bit management module, for default monitoring to be recorded as presetting bit focusing group position to defocused focusing group position apart from lower
It sets；
Focusing group position is adjusted to remember by automatic focus module for changing in focus position and again after zoom
The presetting bit focusing group position of record starts to focus automatically and complete to focus.
5. the device that motor-driven lens as claimed in claim 4 focus automatically, which is characterized in that the presetting bit management module will
Default monitoring is recorded as presetting bit focusing group position to defocused focusing group position apart from lower, performs the following operations:
According to default monitoring distance, adjusts camera back focus position and be overlapped with rear lens focus point, complete focusing；
Presetting bit focusing group position currently will be recorded as to defocused focusing group position.
6. the device that motor-driven lens as described in claim 4 or 5 focus automatically, which is characterized in that the default monitoring distance,
It is the object distance of monitoring objective in camera supervised scene.
7. a kind of video camera, which is characterized in that the video camera includes motor-driven lens, the motor-driven lens, comprising:
Presetting bit management module, for default monitoring to be recorded as presetting bit focusing group position to defocused focusing group position apart from lower
It sets；
Focusing group position is adjusted to remember by automatic focus module for changing in focus position and again after zoom
The presetting bit focusing group position of record starts to focus automatically and complete to focus.
8. video camera as claimed in claim 7, which is characterized in that the presetting bit management module is by default monitoring apart from lower right
Defocused focusing group position is recorded as presetting bit focusing group position, performs the following operations:
According to default monitoring distance, adjusts camera back focus position and be overlapped with rear lens focus point, complete focusing；
Presetting bit focusing group position currently will be recorded as to defocused focusing group position.
9. video camera as claimed in claim 7 or 8, which is characterized in that the default monitoring distance, is camera supervised scene
The object distance of middle monitoring objective.
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| CN201711473140.0A CN109995982B (en) | 2017-12-29 | 2017-12-29 | Method and device for automatically focusing electric lens and camera |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711473140.0A CN109995982B (en) | 2017-12-29 | 2017-12-29 | Method and device for automatically focusing electric lens and camera |
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| CN109995982B CN109995982B (en) | 2021-06-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110719444A (en) * | 2019-11-07 | 2020-01-21 | 中国人民解放军国防科技大学 | Multi-sensor fusion omnibearing monitoring and intelligent camera shooting method and system |
| CN110719404A (en) * | 2019-10-10 | 2020-01-21 | 浙江大华技术股份有限公司 | Electric lens control method and device |
| CN111083367A (en) * | 2019-12-26 | 2020-04-28 | 浙江大华技术股份有限公司 | Focusing compensation method and device, electronic equipment and storage medium |
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| CN105763795A (en) * | 2016-03-01 | 2016-07-13 | 苏州科达科技股份有限公司 | Focusing method and apparatus, cameras and camera system |
| CN106210519A (en) * | 2016-07-12 | 2016-12-07 | 山东神戎电子股份有限公司 | A kind of focus method of the autofocus system of band memory function |
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| US20040189852A1 (en) * | 2003-03-31 | 2004-09-30 | Fuji Photo Film Co., Ltd. | Digital camera |
| CN104836954A (en) * | 2015-04-23 | 2015-08-12 | 金三立视频科技（深圳）有限公司 | Zooming tracking method and apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110719404A (en) * | 2019-10-10 | 2020-01-21 | 浙江大华技术股份有限公司 | Electric lens control method and device |
| CN110719404B (en) * | 2019-10-10 | 2021-09-21 | 浙江大华技术股份有限公司 | Electric lens control method and device |
| CN110719444A (en) * | 2019-11-07 | 2020-01-21 | 中国人民解放军国防科技大学 | Multi-sensor fusion omnibearing monitoring and intelligent camera shooting method and system |
| CN111083367A (en) * | 2019-12-26 | 2020-04-28 | 浙江大华技术股份有限公司 | Focusing compensation method and device, electronic equipment and storage medium |
| CN111083367B (en) * | 2019-12-26 | 2021-06-15 | 浙江大华技术股份有限公司 | Focusing compensation method and device, electronic equipment and storage medium |
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