CN109769090A - A kind of focal length zoom quick focusing method and system based on image procossing - Google Patents
A kind of focal length zoom quick focusing method and system based on image procossing Download PDFInfo
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- CN109769090A CN109769090A CN201910120034.7A CN201910120034A CN109769090A CN 109769090 A CN109769090 A CN 109769090A CN 201910120034 A CN201910120034 A CN 201910120034A CN 109769090 A CN109769090 A CN 109769090A
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Abstract
The present invention relates to a kind of focal length zoom quick focusing method and system based on image procossing, this method comprises: obtaining the direction of motion of telephoto lens zoom motor；The zoom trend of the telephoto lens is determined according to the direction of motion；Initial focus control is carried out to the telephoto lens according to the zoom trend, to change the focusing multiple value of the telephoto lens；While the focusing multiple value persistently changes, intelligibility evaluation is carried out to the picture obtained by the telephoto lens, obtains intelligibility evaluation value, and determine the change curve of the intelligibility evaluation value；Focus control is modified to the telephoto lens according to the change curve, to correct the focusing multiple value, until intelligibility evaluation value reaches the extreme value of the change curve.The present invention can carry out quickly automatic focusing to the object of shooting in telephoto lens zoom, allow telephoto lens that can keep clearly picture constantly during imaging.
Description
Technical field
The present invention relates to camera control technical fields more particularly to a kind of focal length zoom based on image procossing quickly to gather
Burnt method and system.
Background technique
Currently, with safety monitoring, TV, profession higher and higher to the quality requirement for obtaining video of the technical fields such as shooting with video-corder
Telephoto lens is using more more and more universal.In the use process of telephoto lens, when with telephoto lens shoot a high-speed motion object
When body, with object at a distance from camera lens or the variation of lens focus, the image profiles of object can thicken, at this moment need pair
Image is focused operation.Generally, focusing is more troublesome and regulating effect is undesirable using manually adjusting, and use from
It is dynamic when adjusting focusing parameter, the automatic focusing of telephoto lens will appear focusing speed slowly, focusing can exist blurring process and
The problems such as focusing in time is difficult to when focal length continuously changes.This influences whether the image quality of image in use process, especially needs
When carrying out image procossing tracking to imaging, focus automatically when and it is fuzzy when and clearly process can seriously affect image procossing with
Track effect.
Summary of the invention
In order to carry out quickly automatic focusing, and energy during imaging to the object of shooting in telephoto lens zoom
Clearly picture, the present invention provide a kind of focal length zoom quick focusing method and system based on image procossing for enough moment holdings.
The technical scheme to solve the above technical problems is that
In a first aspect, the embodiment of the invention provides a kind of focal length zoom quick focusing method based on image procossing, it should
Method includes the following steps:
Obtain the direction of motion of telephoto lens zoom motor.
The zoom trend of the telephoto lens is determined according to the direction of motion.
Initial focus control is carried out to the telephoto lens according to the zoom trend, to change the poly- of the telephoto lens
Burnt multiple value.
While the focusing multiple value persistently changes, clarity is carried out to the picture obtained by the telephoto lens
Assessment obtains intelligibility evaluation value, and determines the change curve of the intelligibility evaluation value.
Focus control is modified to the telephoto lens according to the change curve, to correct the focusing multiple value,
Until intelligibility evaluation value reaches the extreme value of the change curve.
Second aspect, the quick focusing system of focal length zoom based on image procossing that the embodiment of the invention provides a kind of should
System includes:
Monitoring modular, for obtaining the direction of motion of telephoto lens zoom motor.
Module is prejudged, for determining the zoom trend of the telephoto lens according to the direction of motion.
Just control module, for carrying out initial focus control to the telephoto lens according to the zoom trend, to change
State the focusing multiple value of telephoto lens.
Evaluation module, for while the focusing multiple value persistently changes, to what is obtained by the telephoto lens
Picture carries out intelligibility evaluation, obtains intelligibility evaluation value, and determine the change curve of the intelligibility evaluation value.
Regulate and control module, for being modified to the telephoto lens by described control unit according to the change curve
Focus control, to correct the focusing multiple value, until intelligibility evaluation value reaches the extreme value of the change curve.
The beneficial effects of the present invention are: utilizing the direction of motion of sensing apparatus monitoring telephoto lens zoom motor.According to change
The direction of motion of burnt motor can analyze and judge that the zoom trend of telephoto lens becomes larger or becomes smaller.According to zoom trend
Telephoto lens is tentatively controlled, that is, allow focusing multiple value and continue to become larger also to be to continue with and become smaller.Meanwhile to adjusting during
The picture that takes carry out intelligibility evaluation, the clarity for observing image rises or has dropped.It is commented according to clarity
Valuation variation tendency carries out control adjustment to telephoto lens, determines that zoom motor is to continue to move along former direction or to negative side
To rollback.By lasting amendment, until the clarity of picture reaches clearest state.So far, epicycle focuses automatically and terminates.It should
In method, the zoom speed sync of the speed and telephoto lens that entirely focus.And due to assessing at any time clarity, and and
When control zoom motor the direction of motion be to continue with holding or opposite direction and retract so that can be protected constantly during entire imaging
Hold clearly picture.
Detailed description of the invention
Fig. 1 is the process signal for the focal length zoom quick focusing method based on image procossing that one embodiment of the invention provides
Figure；
Fig. 2 is the clarity for the focal length zoom quick focusing method based on image procossing that further embodiment of this invention provides
Assessed value and focusing multiple value variation relation schematic diagram；
Fig. 3 be another embodiment of the present invention provides the process of the focal length zoom quick focusing method based on image procossing show
It is intended to；
Fig. 4 is the structural representation for the quick focusing system of focal length zoom based on image procossing that one embodiment of the invention provides
Figure；
Fig. 5 be another embodiment of the present invention provides the structure of the quick focusing system of focal length zoom based on image procossing show
It is intended to；
Fig. 6 is that the structure for the quick focusing system of focal length zoom based on image procossing that further embodiment of this invention provides is shown
It is intended to.
Specific embodiment
In being described below, for illustration and not for limitation, propose such as specific system structure, interface, technology it
The detail of class understands the present invention to cut thoroughly.However, it will be clear to one skilled in the art that there is no these specific
The present invention also may be implemented in the other embodiments of details.In other situations, omit to well-known system, circuit and
The detailed description of method, in case unnecessary details interferes description of the invention.
As shown in Figure 1, the embodiment of the invention provides a kind of focal length zoom quick focusing method based on image procossing.It should
Method includes the following steps:
Obtain the direction of motion of telephoto lens zoom motor.
The zoom trend of the telephoto lens is determined according to the direction of motion.
Initial focus control is carried out to the telephoto lens according to the zoom trend, to change the poly- of the telephoto lens
Burnt multiple value.
While the focusing multiple value persistently changes, clarity is carried out to the picture obtained by the telephoto lens
Assessment obtains intelligibility evaluation value, and determines the change curve of the intelligibility evaluation value.
Focus control is modified to the telephoto lens according to the change curve, to correct the focusing multiple value,
Until intelligibility evaluation value reaches the extreme value of the change curve.
Specifically, when shooting static target, during focusing multiple value starts from scratch and becomes larger, telephoto lens is clapped
Take the photograph picture clarity can undergo one from unintelligible to more next clearly to clearest again to gradually fuzzy process.Such as Fig. 2 institute
Show, schematically illustrates the change curve of an intelligibility evaluation value.When shooting moving target, which can be along cross
Coordinate direction or so translation.The change curve of this intelligibility evaluation value focus multiple value domain of variation in often only one
Most it is worth.And with the movement of target, this is most worth corresponding abscissa, that is, the corresponding focusing multiple value in clearest place also can be with
Variation.Our target is exactly to determine this optimal focusing multiple value at any time.And due to, in shooting process at any time into
Line focusing operation, the rare mutation of clarity, so in the former optimal extreme value found faced in domain for focusing multiple value, often
It is at the most value of the change curve of intelligibility evaluation value.
Utilize the direction of motion of sensing apparatus monitoring telephoto lens zoom motor.It, can according to the direction of motion of zoom motor
To analyze and determine out that the zoom trend of telephoto lens becomes larger or becomes smaller.Telephoto lens is tentatively controlled according to zoom trend
System, that is, allow focusing multiple value and continue to become larger also to be to continue with and become smaller.Meanwhile the picture taken during adjusting is carried out clear
Clear degree assessment, the clarity for observing image rise or have dropped.According to intelligibility evaluation value variation tendency, to long lens
Head carries out control adjustment, determines that zoom motor is to continue to move along former direction or retract to opposite direction.By lasting amendment, directly
Clarity to picture reaches clearest state.So far, epicycle focuses automatically and terminates.
In this method, the zoom speed sync of the speed and telephoto lens that entirely focus.And due at any time to clarity into
Row assessment, and the direction of motion for controlling zoom motor in time is to continue with holding or opposite direction retracts, so that the process being entirely imaged
In can keep clearly picture constantly.
In a preferred embodiment, described while the focusing multiple value persistently changes, to passing through the focal length
The picture that camera lens obtains carries out intelligibility evaluation, obtains intelligibility evaluation value, determines the change curve of the intelligibility evaluation value,
It specifically includes:
While the focusing multiple value persistently changes, edge inspection is carried out to the picture using edge detection algorithm
It surveys, obtains edge pixel points, the edge pixel is counted and is used as the intelligibility evaluation value.
Determine the change curve of the intelligibility evaluation value, wherein the change curve includes multiple continuous cross arrangements
First transition and last transition.
When changing the focusing multiple value, edge detection just is carried out to picture using edge detection algorithm at any time.Side
Edge detection is to assess the effective means of image definition, if the edge pixel point quantity that detected is more, it was demonstrated that picture is got over
Clearly；If the edge pixel point quantity that detected is fewer, it was demonstrated that picture is fuzzyyer.The edge pixel points that will test out are made
It is recorded for the intelligibility evaluation value, and each assessed value is formed to the variation of intelligibility evaluation value in a manner of such as fitting
Curve can judge the variation tendency of intelligibility evaluation value according to the change curve of intelligibility evaluation value.
In a preferred embodiment, described that focusing control is modified to the telephoto lens according to the change curve
It makes, includes: to correct the process for focusing multiple value
When the intelligibility evaluation value is in first transition, the zoom motor is controlled along the direction of motion after reforwarding
It is dynamic, to continue to correct the focusing multiple value.
When the intelligibility evaluation value is in last transition, the zoom motor is controlled along the negative side of the direction of motion
To rollback, until intelligibility evaluation value reaches at the extreme value of the change curve.
Clarity is assessed at any time, and in time according to video pictures clarity change curve, control zoom trend after
Continuation of insurance is held or opposite direction retracts, so that can keep clearly picture constantly during entire imaging.The speed entirely focused
With the zoom speed sync of telephoto lens.
In a preferred embodiment, the edge detection algorithm is Sobel edge detection algorithm.
Sobel operator is common operator in Image Edge-Detection, and Sobel edge detection algorithm is in image procossing and meter
A kind of Edge-Detection Algorithm that calculation machine vision is used widely.The edge detection algorithm pair carried out using Sobel operator
Gray scale gradual change and noise it is more image processing effect it is more preferable.
In a preferred embodiment, as shown in figure 3, the method also includes following steps:
Persistently obtain the motion conditions of the zoom motor, wherein the motion conditions include stationary state, focus movement
State and starting state, the stationary state are the totally stationary state of the zoom motor, and the focus movement state is pair
Telephoto lens zoom motor when carrying out initial focus control or being modified focus control to the telephoto lens
Persistent movement state, when the starting state is that the zoom motor is switched to the focus movement state from the stationary state
Critical state.
When the zoom motor is in the starting state, the movement side for obtaining telephoto lens zoom motor is executed
To the step of.
After a wheel focuses, into the case where monitoring wait state, capture the movement of zoom motor.When the zoom electricity
When machine is in the stationary state, the step of continuing to execute the motion conditions for persistently obtaining the zoom motor.When described
When zoom motor is again started up movement, start the step of executing the direction of motion for obtaining telephoto lens zoom motor, and hold
Row by this step other steps, start next round focus.It so can guarantee and enter focus control procedure at any time, guarantee
The moment keeps clearly picture during entire video capture.
As shown in figure 4, the embodiment of the invention provides a kind of quick focusing system of focal length zoom based on image procossing, it should
System includes:
Monitoring modular, for obtaining the direction of motion of telephoto lens zoom motor.
Module is prejudged, for determining the zoom trend of the telephoto lens according to the direction of motion.
Just control module, for carrying out initial focus control to the telephoto lens according to the zoom trend, to change
State the focusing multiple value of telephoto lens.
Evaluation module, for while the focusing multiple value persistently changes, to what is obtained by the telephoto lens
Picture carries out intelligibility evaluation, obtains intelligibility evaluation value, and determine the change curve of the intelligibility evaluation value.
Regulate and control module, for being modified to the telephoto lens by described control unit according to the change curve
Focus control, to correct the focusing multiple value, until intelligibility evaluation value reaches the extreme value of the change curve.
After monitoring modular gets the direction of motion of telephoto lens zoom motor, the direction is sent to anticipation module.In advance
Module is sentenced according to the direction of motion of zoom motor, be can analyze and is judged that the zoom trend of telephoto lens becomes larger or becomes smaller.
Just control module tentatively controls telephoto lens by control unit according to zoom trend, that is, focusing multiple value is allowed to continue to become
Greatly or continue to become smaller.Meanwhile during controlling to adjust to telephoto lens, it is clear that evaluation module at any time carries out picture
Degree assessment, the clarity for observing image rise or have dropped.Regulate and control module according to intelligibility evaluation value change curve, after
It is continuous that control adjustment is carried out to telephoto lens, determine that zoom motor is to continue to move along former direction or retract to opposite direction.Pass through
Lasting amendment, until the clarity of picture reaches clearest state.So far, epicycle focuses automatically and terminates.In the system, entirely
The speed of focusing and the zoom speed sync of telephoto lens.And due to assessing at any time clarity, and zoom is controlled in time
Trend continues to keep or opposite direction retracts, so that can keep clearly picture constantly during entire imaging.
In a preferred embodiment, as shown in figure 5, the evaluation module includes:
Image processing unit, for while the focusing multiple value persistently changes, using edge detection algorithm to institute
It states picture and carries out edge detection, obtain edge pixel points, the edge pixel is counted and is used as the intelligibility evaluation value.
Numeric processing unit, for determining the change curve of the intelligibility evaluation value, wherein the change curve includes
The first transition of multiple continuous cross arrangements and last transition.
Image processing unit just carries out edge inspection to picture using edge detection algorithm at any time when focusing multiple value change
It surveys.Edge detection is to assess the effective means of image definition, if the edge pixel point quantity that detected is more, it was demonstrated that is drawn
Face is more clear；If the edge pixel point quantity that detected is fewer, it was demonstrated that picture is fuzzyyer.Numeric processing unit will test out
Edge pixel points record as the intelligibility evaluation value, and each assessed value is formed clearly in a manner of such as fitting
The change curve of clear degree assessed value, can judge the variation tendency of intelligibility evaluation value according to the change curve of intelligibility evaluation value.
In a preferred embodiment, the regulation module includes:
First regulation unit, for controlling the zoom motor edge when the intelligibility evaluation value is in first transition
The direction of motion continues to move, to continue to correct the focusing multiple value.
Second regulation unit, for controlling the zoom motor edge when the intelligibility evaluation value is in last transition
The opposite direction of the direction of motion retracts, until intelligibility evaluation value reaches at the extreme value of the change curve.
Evaluation module at any time assesses clarity, and gives regulation mould according to video pictures clarity variation tendency in time
Block sends instruction.Regulation module control zoom trend continues to keep or opposite direction retracts, so that can during entire imaging
Moment keeps clearly picture.The zoom speed sync of the speed and telephoto lens that entirely focus.
In a preferred embodiment, the edge detection algorithm is Sobel edge detection algorithm.
Sobel operator is common operator in Image Edge-Detection, Sobel edge detection used in image processing unit
A kind of Edge-Detection Algorithm that algorithm is used widely in image procossing and computer vision.Using Sobel operator into
Capable edge detection algorithm is more preferable to the image processing effect that gray scale gradual change and noise are more.
In a preferred embodiment, as shown in fig. 6, the system also includes:
Trigger module, for continuing to monitor the motion conditions of the zoom motor, wherein the motion conditions include static
State, focus movement state and starting state, the stationary state are the totally stationary state of the zoom motor, the focusing
Motion state is carries out initial focus control or being modified focus control when institute to the telephoto lens to the telephoto lens
The persistent movement state of zoom motor is stated, the starting state is switched to for the zoom motor from the stationary state described poly-
Critical state when burnt motion state；And when the zoom motor is in the starting state, the monitoring modular is triggered.
After a wheel focuses, each module enters monitoring wait state, and trigger module captures the feelings of the movement of zoom motor
Condition, when the zoom motor is again started up movement, triggering monitoring modular work starts to cause the work of other module cooperatives
Next round focuses.It so can guarantee and enter focus state at any time, so that the moment keeps clearly drawing during entire video capture
Face.
Reader should be understood that in the description of this specification reference term " one embodiment ", " is shown " some embodiments "
The description of example ", specific examples or " some examples " etc. mean specific features described in conjunction with this embodiment or example, structure,
Material or feature are included at least one embodiment or example of the invention.In the present specification, above-mentioned term is shown
The statement of meaning property need not be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described
It may be combined in any suitable manner in any one or more of the embodiments or examples.In addition, without conflicting with each other, this
The technical staff in field can be by the spy of different embodiments or examples described in this specification and different embodiments or examples
Sign is combined.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. a kind of focal length zoom quick focusing method based on image procossing, which is characterized in that described method includes following steps:
Obtain the direction of motion of telephoto lens zoom motor；
The zoom trend of the telephoto lens is determined according to the direction of motion；
Initial focus control is carried out to the telephoto lens according to the zoom trend, to change the focusing times of the telephoto lens
Numerical value；
While the focusing multiple value persistently changes, clarity is carried out to the picture obtained by the telephoto lens and is commented
Estimate, obtains intelligibility evaluation value, and determine the change curve of the intelligibility evaluation value；
Focus control is modified to the telephoto lens according to the change curve, to correct the focusing multiple value, until
Intelligibility evaluation value reaches at the extreme value of the change curve.
2. the focal length zoom quick focusing method according to claim 1 based on image procossing, which is characterized in that it is described
While the focusing multiple value persistently changes, intelligibility evaluation is carried out to the picture obtained by the telephoto lens, is obtained
Intelligibility evaluation value determines that the process of the change curve of the intelligibility evaluation value includes:
While the focusing multiple value persistently changes, edge detection is carried out to the picture using edge detection algorithm, is obtained
Edge pixel points are obtained, the edge pixel is counted and is used as the intelligibility evaluation value；
Determine the change curve of the intelligibility evaluation value, wherein the change curve includes the upper of multiple continuous cross arrangements
Rise section and last transition.
3. the focal length zoom quick focusing method according to claim 2 based on image procossing, which is characterized in that described
Focus control is modified to the telephoto lens according to the change curve, to correct the focusing multiple value, until clarity
The process that assessed value reaches at the extreme value of the change curve includes:
When the intelligibility evaluation value is in the first transition, the zoom motor is controlled along the direction of motion after reforwarding
It is dynamic, to continue to correct the focusing multiple value；
When the intelligibility evaluation value is in the last transition, the zoom motor is controlled along the negative side of the direction of motion
To rollback, until intelligibility evaluation value reaches at the extreme value of the change curve.
4. the focal length zoom quick focusing method according to claim 2 based on image procossing, which is characterized in that the side
Edge detection algorithm is Sobel edge detection algorithm.
5. the focal length zoom quick focusing method according to any one of claims 1 to 4 based on image procossing, feature
It is, the method also includes following steps:
Persistently obtain the motion conditions of the zoom motor, wherein the motion conditions include stationary state, focus movement state
And starting state, the stationary state are the totally stationary state of the zoom motor, the focus movement state is to described
Telephoto lens carries out initial focus control or while being modified focus control to telephoto lens zoom motor continues
Motion state, the starting state are the facing when zoom motor is switched to the focus movement state from the stationary state
Boundary's state；
When the zoom motor is in the starting state, the direction of motion for obtaining telephoto lens zoom motor is executed
Step.
6. a kind of quick focusing system of focal length zoom based on image procossing, which is characterized in that the system comprises:
Monitoring modular, for obtaining the direction of motion of telephoto lens zoom motor；
Module is prejudged, for determining the zoom trend of the telephoto lens according to the direction of motion；
Just control module, for carrying out initial focus control to the telephoto lens according to the zoom trend, to change the length
The focusing multiple value of zoom lens；
Evaluation module, for while the focusing multiple value persistently changes, to the picture obtained by the telephoto lens
Intelligibility evaluation is carried out, obtains intelligibility evaluation value, and determine the change curve of the intelligibility evaluation value；
Regulate and control module, for being modified focusing to the telephoto lens by described control unit according to the change curve
Control, to correct the focusing multiple value, until intelligibility evaluation value reaches the extreme value of the change curve.
7. the focal length zoom quick focusing system according to claim 6 based on image procossing, which is characterized in that institute's commentary
Estimating module includes:
Image processing unit, for while the focusing multiple value persistently changes, using edge detection algorithm to the picture
Face carries out edge detection, obtains edge pixel points, the edge pixel is counted and is used as the intelligibility evaluation value；
Numerical analysis unit, for determining the change curve of the intelligibility evaluation value, wherein the change curve includes multiple
The first transition of continuous cross arrangement and last transition.
8. the focal length zoom quick focusing system according to claim 6 based on image procossing, which is characterized in that the tune
Controlling module includes:
First regulation unit, for controlling the zoom motor edge when the intelligibility evaluation value is in the first transition
The direction of motion continues to move, to continue to correct the focusing multiple value；
Second regulation unit, for controlling the zoom motor edge when the intelligibility evaluation value is in the last transition
The opposite direction of the direction of motion retracts, until intelligibility evaluation value reaches at the extreme value of the change curve.
9. the focal length zoom quick focusing system according to claim 7 based on image procossing, which is characterized in that the side
Edge detection algorithm is Sobel edge detection algorithm.
10. the quick focusing system of focal length zoom according to claim 6 to 9 any one based on image procossing, special
Sign is, the system also includes:
Trigger module, for continuing to monitor the motion conditions of the zoom motor, wherein the motion conditions include static shape
State, focus movement state and starting state, the stationary state are the totally stationary state of the zoom motor, the focusing fortune
Dynamic state be when carrying out initial focus control to the telephoto lens or being modified focus control to the telephoto lens described in
The persistent movement state of zoom motor, the starting state are switched to the focusing from the stationary state for the zoom motor
Critical state when motion state；And when the zoom motor is in the starting state, the monitoring modular is triggered.
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| CN117579814A (en) * | 2024-01-16 | 2024-02-20 | 苏州宣雄智能科技有限公司 | Quick lens detection method based on focusing detection |
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