CN104238236B - A kind of movement camera lens zoom follower method and device - Google Patents
A kind of movement camera lens zoom follower method and device Download PDFInfo
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- CN104238236B CN104238236B CN201410451691.7A CN201410451691A CN104238236B CN 104238236 B CN104238236 B CN 104238236B CN 201410451691 A CN201410451691 A CN 201410451691A CN 104238236 B CN104238236 B CN 104238236B
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Abstract
The present invention provides a kind of movement camera lens zoom follower method, including: A, the position that determines next timeslice zoom motor, and according to focus motor position corresponding to camera tracking profile lookup；B, the path length judged between current focus motor position and the described focus motor position inquired, whether in the range of one timeslice of focus motor can run to, if turning D, otherwise turn C；C, the direction run according to focus motor next one timeslice, add or deduct that the maximum path length that a timeslice focus motor can run obtains its next position on current location；According to the next position of focus motor, camera tracking curve is searched the position of the zoom motor of correspondence；D, according to obtaining zoom motor and focus motor positional information, instruction zoom motor and focus motor run to respective position in next timeslice.The present invention program, during zoom, remains that zoom and focus motor press close to camera tracking curve very well.
Description
Technical field
The present invention relates to video surveillance camera field, particularly relate to a kind of movement camera lens zoom follower method and
Device.
Background technology
Zoom is followed, and is that the camera tracking curve according to current object distance is (also known as zoom tracking curve, generally
Being the curve having certain radian, usual camera lens manufacturer can provide this curve under different object distances), become
Times time adjust focus motor in real time and reach image image purpose clearly during whole zoom.But it is electric
Machine is belonging to mechanical part, there is intrinsic physical characteristic, such as runs toggle speed, acceleration, instead
To parameters such as pause, maximum speeds, and zoom motor, focus motor all can only linear runnings.
Please join the curve of pursuit under certain object distance that the real camber line of Fig. 1, Fig. 1 is camera lens.This reality camber line
Terminal A point is the widest burnt end points of camera lens, and B point is the focal length end points of camera lens.A point is to the change of B point
The most a length of Z5, A point is F5 to the focusing length of B point；If single issues zoom length and focusing
Length, zoom motor and focus motor i.e. run according to the instruction of dotted line AB.AB dotted line and AB reality arc
Line is the most misaligned two lines do not pressed close to, if so issuing focal length according to this single and gather
The mode of burnt length instructs zoom motor and focus motor to run, and image will be made at whole zooming procedure
In smudgy, do not reach the effect clearly of the image required for zooming procedure completely.
Please join Fig. 2, Fig. 2 to chase after to allow the track of zoom motor and focus motor actual motion press close to camera lens
Track curve, i.e. real camber line shown in Fig. 2, A point is divided into N to this section of zoom times distance shown in B point
Section, every section of corresponding zoom motor is in the running length of timeslice t, the time span of each timeslice
Equal.First timeslice is smaller, so stroke is relative to other due to the speed of zoom electric motor starting
Timeslice is short；Last timeslice stops, so stroke is relative to other times owing to needs slow down
Sheet is also short；Other timeslice can run at high speed, and haul distance is the most identical.Focus motor exists
Each timeslice t is run according to camera tracking curve.For this camera tracking curve of Fig. 2, I
It can be seen that the C end of AC section deviates curve of pursuit slightly around.This problem, if substantially by time
Between sheet divide more carefully just can solve.And CD section is also deviation camera tracking curve, gather in this section
Burnt motor does not move.The most move at this section of focus motor and be because camera tracking curve now
Require to focus on reversely mobile, and when focus motor is reverse, must pause that (CD section is corresponding for a timeslice
It is a timeslice), so focus motor does not move in CD section.CD section deviation camera lens is chased after
The problem of track curve can also solve by the way of segmentation timeslice.Due to the dead time that motor is reverse
Sheet camera lens specification regulation is 1 VD time.When this timeslice is far smaller than the CD shown in Fig. 2
Between the length of sheet, so after reducing timeslice, the reverse pause of focus motor is negligible, and focuses on electricity
The operation of machine can press close to camera tracking curve to a great extent, thus keeps image the most clear.
For DEB section in figure: DE section zoom motor is complete required stroke, and focus motor is at height
When speed is run, can only achieve E point position the soonest, so this section, the operation substantial deviation of focus motor
Camera tracking curve；EB section zoom motor is the most out of service, and focus motor then runs to B from E point
Point, so this section, the operation of focus motor also substantial deviation camera tracking curve.Therefore, focal length end
DEB is away from actual curve of pursuit, and zoom is image blurring during following.For this section, even if time
Between sheet reduce, the track of operation remains DEB, and during zoom is followed, image still obscures.
Summary of the invention
In view of this, the present invention provides a kind of movement camera lens zoom follower method and device.
This movement camera lens zoom follower method includes: A, determine the position of next timeslice zoom motor,
And the focusing that position according to this described next timeslice zoom motor of camera tracking profile lookup is corresponding
Motor position；B, judge the described focus motor that inquires in current focus motor position and step A
Path length between position whether in the range of one timeslice of focus motor can run to, if
It is to go to step D, otherwise goes to step C；C, inquire according in focus motor current location and step A
Focus motor position determine the direction that focus motor next one timeslice is run, if to nearly burnt end side
To operation, the then maximum path length that can run plus a timeslice focus motor on current location
Obtain its next position, if running, then when deducting one on current location to remote burnt extreme direction
Between the maximum distance that can run of sheet focus motor obtain its next position；According to the described focusing obtained
The next position of motor, searches the position of the zoom motor of correspondence on camera tracking curve；Further
Perform step D；D, according to obtaining zoom motor and the positional information of focus motor, indicate zoom motor
In next timeslice, respective position is run to focus motor；Return step A.
This movement camera lens zoom following device includes: zoom focal position determines module, is used for determining next
The position of individual timeslice zoom motor, and according to this described next timeslice of camera tracking profile lookup
The focus motor position that the position of zoom motor is corresponding；Focusing power judge module, current for judging
Whether the path length between focus motor position and the described described focus motor position inquired is focusing on
In the range of one timeslice of motor can run to；Zoom focal position adjusting module, is used for focusing on energy
Power judge module judges between current focus motor position and the described described focus motor position inquired
Path length not in the range of one timeslice of focus motor can run to time, according to focus motor
Current location and the described focus motor position inquired determine the side that focus motor next one timeslice is run
To, if running, then plus a timeslice focus motor energy on current location to nearly burnt extreme direction
Enough maximum path lengths run obtain its next position, if running to remote burnt extreme direction, then exist
Deduct the maximum distance that a timeslice focus motor can run on current location and obtain its next position；
According to the next position of the described focus motor obtained, camera tracking curve is searched the zoom of correspondence
The position of motor；Zoom focuses on runs module, for according to obtaining zoom motor and the position of focus motor
Information, instruction zoom motor and focus motor run to respective position in next timeslice.
Compared to prior art, the present invention program considers the ability of focus motor, in whole zoom process
In make focus motor and zoom motor the most well press close to camera tracking curve motion, zoom procedural image
Clearly.
Accompanying drawing explanation
Fig. 1 is a camera tracking curve example.
Fig. 2 is that the zoom in the case of division timeslice follows process example.
Fig. 3 is embodiment of the present invention flow chart.
Fig. 4 is that existing a kind of zoom follows example process.
Fig. 5 is that a kind of zoom of the present invention follows example process.
Fig. 6 is embodiment of the present invention device building-block of logic.
Detailed description of the invention
For solving the technical problem mentioned in background technology, the present invention provides new a kind of movement camera lens zoom
The method followed.The method can remain that zoom motor and focus motor are fine during zoom
Follow camera tracking curve.Describe in detail below by way of detailed description of the invention.
Please join Fig. 3, Fig. 3 and give the flow chart of the embodiment of the present invention.
S31, determine the position of next timeslice zoom motor, and according to camera tracking profile lookup
The focus motor position that the position of this described next timeslice zoom motor is corresponding.
Here the cycle time of a generally corresponding VD signal of timeslice, if the frequency of VD signal is
60HZ, then the cycle time of VD signal is 16.7ms, then a timeslice is 16.7ms.Generally become
The speed fixing with one, after startup optimization, is run by times motor, such as 1320PPS (fortune per second
Row 1320 step), then a timeslice runs 22 steps.Owing to the length of each step of zoom motor is fixed as
0.01 millimeter (different zoom motors may be the most different, but for same zoom motor,
This length is changeless), so being easy to be calculated what a timeslice zoom motor ran
Length.Then can be obtained by its next time further combined with the positional information that zoom motor is current
The position that sheet runs to.
There is zoom motor behind the position of next timeslice, under just obtaining according to camera tracking curve
The position of one timeslice focus motor.
S32, judge the described focus motor position that inquires in current focus motor position and step S31
Path length between putting whether in the range of one timeslice of focus motor can run to, if
Go to step S34, otherwise go to step S33.
The length range that focus motor runs in a timeslice is limited, such as its maximum operation
Speed is 3000PPS, if every step-length degree is also 0.01 millimeter, then and its maximum fortune in a timeslice
Line length is: 3000*16.7*0.01=0.5 millimeter.Once focus motor runs to step from current location
The distance of the position inquired in 31 is more than 0.5 millimeter, then mean the ability beyond focus motor.
So the main purpose of this step is to judge whether the ability of focus motor can be according to camera tracking curve tracing
Upper zoom motor, then performs different operations according to judged result.Owing to focus motor is a time
Sheet (assuming 16.7ms) run to from current location distance S between the position inquired step 31,
Have as follows between focus motor every step-length degree L, motor speed of service Speed (unit is " step/second ")
Fixed relationship: S=L*Speed/60, if so run institute with calculating focus motor in a timeslice
State path length (the described focus motor position inquired in present convergence motor position and step S31 it
Between path length) need whether speed Speed that reaches realizes in the range of its maximum operational speed
The purpose of step S32 is also permissible, by this way it can be appreciated that step S32 a kind of concrete
Realize.
S33, determine according to the focus motor position inquired in focus motor current location and step S31
The direction that focus motor next one timeslice is run, if running, then in present bit to nearly burnt extreme direction
Put the maximum path length that can run plus a timeslice focus motor and obtain its next position,
If running to remote burnt extreme direction, then deducting a timeslice focus motor on current location can transport
The maximum distance of row obtains its next position；According to the next position of the described focus motor obtained,
Camera tracking curve is searched the position of the zoom motor of correspondence；Perform step S34 further.
This step is first to calculate the highest distance position that focus motor can run to, then according to this highest distance position
The position of operation corresponding to zoom motor is searched again on camera tracking curve.
S34, according to obtaining zoom motor and the positional information of focus motor, instruction zoom motor and focusing
Motor runs to respective position in next timeslice；Return step S31.
Above-described embodiment is owing to considering the ability of focus motor, it is possible to be interpreted as step S33 becoming
Occur in that during following again that the situation that focus motor runs followed by zoom motor, so that whole zoom
Follow process zoom motor and focus motor the most well presses close to camera tracking curve motion.
If it should be noted that according to the institute inquired in current focus motor position and step S31
State direction that focus motor position determines that focus motor next one timeslice runs and current direction be inconsistent,
Then focus motor is out of service in next timeslice.Now zoom motor determines also according to step S31
The position of next timeslice zoom motor is run.
Example below in conjunction with Fig. 4 and Fig. 5 illustrates.
Fig. 4 represents that zoom to arrive D point position from S point.The fixed frequency of VD is configured to 60HZ,
If zoom motor and focus motor are Speed the most at a high speedmaxThe motor fortune of=1320PPS, the most each VD configuration
Row step number is 22 steps.Run to D point process at zoom motor from S point, when arriving A point in figure,
The positional information that zoom motor is corresponding is Xa, and the positional information that focus motor is corresponding is Ya, next VD
Time position corresponding to zoom motor at Xa+22=Xb；Zoom motor correspondence position when Xb position, camera lens
Point corresponding for Xb on curve of pursuit be the focus motor positional information that B, B point is corresponding be Yb.Work as Ya-Yb
During more than 22 step, physical motor characteristics will be surpassed, motor desynchronizing occurs.If configuration focus motor speed
During for 1320PPS, the positional information that lower 1 VD of focus motor runs to be up to Ya-22=Yc this
Individual focal position, the some C that (Xb, Yc) is corresponding deviate from aircraft pursuit course.In zoom from A point to B point
During there will be image blurring.
Fig. 5 is the example using the inventive method.Zoom motor and focus motor follow the tracks of song at camera lens
When line position A (Xa, Ya) puts position, the position calculating next VD zoom motor is: Xa+22=Xb,
Find the B dot position information of correspondence: the positional information that B point is corresponding is (Xb, Yb)；Current VD focuses on
Motor needs the step number run to be Ya Yb.If Ya Yb > 22 step time, then calculate focus motor next
The position that individual VD can run to, i.e. Ya 22；If Ya is 22=Yc, Yc is right on camera tracking curve
Answer C point, at the position Xc being found zoom motor by C point position；Calculated by Xc-Xa the most again
Next VD zoom motor needs the step number run.Next VD zoom motor and the fortune of focus motor
Row track is AC, presses close to aircraft pursuit course, and during zoom is followed the tracks of, image is clear.
In the example of Fig. 4 and Fig. 5, the position of zoom motor and focus motor is all to represent by step number,
This and represent by length and have virtually no difference.
In addition, it is necessary to explanation, Fig. 5 simply by camera tracking curve a bit of as a example by this is described
The scheme of invention.It practice, during whole zoom is followed, zoom motor and focus motor are run
Instruction the solution of the present invention can be used to carry out.
Based on same design, present invention also offers a kind of movement camera lens zoom following device.Please join figure
6, this device includes: zoom focal position determines module, focusing power judge module, zoom focal position
Adjusting module and zoom focus on runs module.
Zoom focal position determines module, for determining the position of next timeslice zoom motor, and
The focus motor that position according to this described next timeslice zoom motor of camera tracking profile lookup is corresponding
Position.
Focusing power judge module, for judge current focus motor position and described inquire described
The scope whether path length between focus motor position can run in one timeslice of focus motor
In.
Zoom focal position adjusting module, judges current focus motor position for focusing power judge module
Put the path length between the described described focus motor position inquired not in one time of focus motor
Sheet can run in the range of time, according to focus motor current location and the described focus motor inquired
Position determines the direction that focus motor next one timeslice is run, if running, then to nearly burnt extreme direction
The maximum path length that can run plus timeslice focus motor on current location obtains its next
Individual position, if running to remote burnt extreme direction, then deducts a timeslice on current location and focuses on electricity
The maximum distance that machine can run obtains its next position；According to next of the described focus motor obtained
Individual position, searches the position of the zoom motor of correspondence on camera tracking curve.
Zoom focuses on runs module, for according to obtaining zoom motor and the positional information of focus motor, referring to
Show that zoom motor and focus motor run to respective position in next timeslice.
Wherein zoom focal position adjusting module, is additionally operable to according to current focus motor position and described
The described focus motor position inquired determines direction that focus motor next one timeslice runs and current
When direction is inconsistent, notice zoom focuses on operation module and stops fortune at next timeslice instruction focus motor
OK, and instruction zoom motor determines, according to zoom focal position, next that module determines in next timeslice
The position of individual timeslice is run.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all at this
Within the spirit of invention and principle, any modification, equivalent substitution and improvement etc. done, should be included in
Within the scope of protection of the invention.
Claims (4)
1. a movement camera lens zoom follower method, it is characterised in that the method includes:
A, determine the position of next timeslice zoom motor, and according to camera tracking profile lookup institute
State the focus motor position that the position of next timeslice zoom motor is corresponding；
B, judge the described focus motor position that inquires in current focus motor position and step A it
Between path length whether in the range of one timeslice of focus motor can run to, if turn step
Rapid D, otherwise goes to step C；
C, determine focusing according to the focus motor position inquired in focus motor current location and step A
The direction that motor next one timeslice is run, if running, then on current location to nearly burnt extreme direction
The maximum path length that can run plus a timeslice focus motor obtains its next position, if
It is to run to remote burnt extreme direction, then on current location, deducts what a timeslice focus motor can run
Maximum distance obtains its next position；According to the next position of the described focus motor obtained, at mirror
The position of the zoom motor of correspondence is searched on head curve of pursuit；Perform step D further；
D, according to obtaining zoom motor and the positional information of focus motor, instruction zoom motor and focus on electricity
Machine runs to respective position in next timeslice；Return step A.
2. the method for claim 1, it is characterised in that the method also includes: if according to currently
Focus motor position and step A in the described focus motor position that inquires determine that focus motor is next
Direction and current direction that timeslice is run are inconsistent, then focus motor stops fortune in next timeslice
OK；According to step A, zoom motor then determines that the position of next timeslice is run.
3. a movement camera lens zoom following device, it is characterised in that this device includes:
Zoom focal position determines module, for determining the position of next timeslice zoom motor, and
According to the focus motor position that the position of next one timeslice zoom motor described in camera tracking profile lookup is corresponding
Put；
Focusing power judge module, for judge current focus motor position and described inquire described
The scope whether path length between focus motor position can run in one timeslice of focus motor
In；
Zoom focal position adjusting module, judges current focus motor position for focusing power judge module
Put the path length between the described described focus motor position inquired not in one time of focus motor
Sheet can run in the range of time, according to focus motor current location and the described focus motor inquired
Position determines the direction that focus motor next one timeslice is run, if running, then to nearly burnt extreme direction
The maximum path length that can run plus timeslice focus motor on current location obtains its next
Individual position, if running to remote burnt extreme direction, then deducts a timeslice on current location and focuses on electricity
The maximum distance that machine can run obtains its next position；According to next of the described focus motor obtained
Individual position, searches the position of the zoom motor of correspondence on camera tracking curve；
Zoom focuses on runs module, for according to obtaining zoom motor and the positional information of focus motor, referring to
Show that zoom motor and focus motor run to respective position in next timeslice.
4. device as claimed in claim 3, it is characterised in that described zoom focal position adjusting module,
It is additionally operable to determining poly-according to current focus motor position and the described described focus motor position inquired
When the direction of burnt motor next one timeslice operation and current direction are inconsistent, notice zoom focuses on to be run
Module is out of service at next timeslice instruction focus motor, and instruction zoom motor is in the next time
According to zoom focal position, sheet determines that the position of next timeslice that module determines is run.
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Families Citing this family (6)
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| CN106559617B (en) * | 2015-11-25 | 2022-08-05 | 北京索斯克科技开发有限公司 | Automatic focusing device of telephoto lens |
| CN105721777B (en) | 2016-03-15 | 2020-04-17 | 惠州Tcl移动通信有限公司 | Shooting device and method for realizing accurate focusing |
| CN106595877B (en) * | 2016-12-29 | 2019-03-08 | 山东神戎电子股份有限公司 | A kind of thermal imaging focusing method for trimming based on key press time |
| CN112198818B (en) * | 2019-07-08 | 2022-05-13 | 浙江宇视科技有限公司 | Control method, device and equipment of stepping type driving structure and storage medium |
| CN111294581B (en) * | 2020-04-27 | 2020-12-15 | 成都极米科技股份有限公司 | Focusing method for optical zooming, projection device and storage medium |
| CN111654617B (en) * | 2020-04-30 | 2021-09-21 | 浙江大华技术股份有限公司 | Method and device for controlling running state of movement lens and computer device |
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