CN105959577A - Camera focusing method and apparatus - Google Patents
Camera focusing method and apparatus Download PDFInfo
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- CN105959577A CN105959577A CN201610559165.1A CN201610559165A CN105959577A CN 105959577 A CN105959577 A CN 105959577A CN 201610559165 A CN201610559165 A CN 201610559165A CN 105959577 A CN105959577 A CN 105959577A
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- Prior art keywords
- lens group
- focus
- object distance
- shift position
- focusing lens
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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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- 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
Abstract
The present invention relates to the field of cameras, and particularly relates to a camera focusing method and apparatus. The method includes the steps of when a first moving position of a focusing lens group is obtained through calculation, calculating a second moving position of a zoom lens group, wherein the first moving position is a position after the focusing lens group leaves the current position of the focusing lens group, and the second moving position is a position after the zoom lens group leaves the current position of the zoom lens group; and moving the focusing lens group to the first moving position, and moving the zoom lens group to the second moving position, wherein when the focusing lens group is moved to the first moving position and the zoom lens group is moved to the second moving position, a focal length of the camera is the same as the focal length before moving. Through adoption of the method, the focal length of the camera is not changed before and after moving, imaging size of a shot target is not changed, in a case in which a hardware module of the camera is not increased, a respiratory effect is eliminated, and the cost is lowered.
Description
Technical field
The present invention relates to field of cameras, be specifically related to focus method and the device of a kind of video camera.
Background technology
Most video cameras have the ability of zoom and focusing, such as digital DV, monitoring camera.Zoom refers to by moving lens group
In the position of focus-variable lens group or structure realize the change of camera lens entirety effective focal length EFL, so that fixed range target
Thing picture on imaging surface zooms in or out.Focus on the position by mobile focusing lens group or change focusing lens group
Structure thus adjust camera lens principal plane and the distance of imaging surface (typically CCD, CMOS or film).So that on imaging surface
As reaching the most clear, meet sampling thheorem or reach this camera lens imaging resolving power limit under this focal length and environment.
Most video cameras all have zoom and automatic focusing function.Automatically the two field picture referred to according to getting is focused on
Statistical information or phase information, drive the focusing lens group focused in (focus) motor moving lens to make photographic subjects
Thing imaging reaches the most clear.Automatically focus on and can be divided into active and passive type two types, wherein, active automatic focusing system
Unite by sending infrared ray, ultrasound wave or other light wave sound rangings calculating object distance to camera lens, then according to camera lens
The position of the focusing lens group that this distance of property calculation is corresponding, drives focusing lens group to move to this position.Passive type gathers automatically
The sharpness information that Jiao gets image by calculating drives focus motor to focus on.
In the ideal case, the zoom (change focal length EFL) of camera lens and focus on that (adjustment focusing module makes target imaging clear
Clear) it is two independent processes.But, the when of actually focusing, the focal length of camera lens also can occur a certain degree of change.By
In being directly proportional size and the lens focus of fixed target imagery, the embodiment on output image is sending out as size of photographic subjects
Having given birth to change, visual field size also there occurs that change, this phenomenon are referred to as " cell breath " simultaneously.
At present, prior art reduces typically by lens design or eliminates " cell breath ", this mode meeting
Increase the complexity of camera lens, thus add the cost of camera lens, such as patent documentation CN102707417A, CN101203789A
Disclosed with US8503102 etc..Patent documentation US20140313374A1 provides a kind of method compensating cell breath and video
Acquisition device, it mainly causes video camera amplification when focusing on owing to focus module changes by the camera lens got
Change, reduces or amplifies the image got compensating the change of video camera amplification by the method for image procossing,
Thus it is constant to realize exporting the amplification of image in focusing, eliminates cell breath.But, the program needs taking the photograph
Increase a digital image processing module on camera, for the image of output is zoomed in or out, add hardware cost,
And digital picture reduces or amplification can cause the loss of image resolution ratio.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is reduce owing to needs increase hardware module or eliminate breathing
Effect causes video camera cost high, thus provides focus method and the device of a kind of video camera.
An aspect of of the present present invention, it is provided that the focus method of a kind of video camera, including: it is being calculated focusing lens group
During the first shift position, calculating the second shift position of focus-variable lens group, wherein, described first shift position is described focus lamp
Sheet group position after the current location of described focusing lens group is moved, described second shift position be described focus-variable lens group from
The current location of described focus-variable lens group move after position；Described focusing lens group is moved to described first shift position,
And described focus-variable lens group is moved to described second shift position, wherein, described focusing lens group moves to described first and moves
Dynamic position and described focus-variable lens group move to focal length phase during described second shift position before the focal length of video camera and movement
With.
Further, when being calculated the first shift position of focusing lens group, calculate the second shifting of focus-variable lens group
Dynamic position comprises determining that the object distance after focus adjustment；It is calculated institute according to when the object distance after front focal length and described focus adjustment
State the first shift position and described second shift position.
Further, position is moved according to described when the object distance after front focal length and described focus adjustment is calculated described first
Put and include with described second shift position: utilize described when the object distance after front focal length and described focus adjustment is from the mirror pre-build
On header table, computation of table lookup obtains described first shift position and described second shift position, wherein, described shot information table
In have recorded in the case of clear focusing described focus-variable lens group at position ziAnd object distance is djTime corresponding described focus lamp
The position f of sheet groupijWith focal length EFLij, wherein, i takes 1 to n, j and takes 1 to m, and wherein, n and m is the integer more than 1.
Further, described focusing lens group is being moved to described first shift position, and by described focus-variable lens group
After moving to described second shift position, described method also includes: calculates described focusing lens group and moves position described first
Putting and the described focus-variable lens group focus value when described second shift position, wherein, described focus value is for the figure of shooting
The definition of picture；Judge whether to find the peak value of focus value；Without finding described peak value, then by described first shift position
As the current location of described focusing lens group, using described second shift position as the current location of described focus-variable lens group,
Using the object distance after described focus adjustment as current object distance, return and perform the step of the object distance after determining focus adjustment with the most true
Determine the object distance after focus adjustment；If finding described peak value, it is determined that go out described focusing lens group corresponding to described peak value and institute
State the position of focus-variable lens group, described focusing lens group is moved to the position of described focusing lens group corresponding to described peak value with
And described focus-variable lens group is moved to the position of described focus-variable lens group corresponding to described peak value.
Further, it is determined that the object distance after focus adjustment includes: obtain the current location of described focusing lens group and described
The current location of focus-variable lens group；Current location according to described focusing lens group and the current location meter of described focus-variable lens group
Calculate and obtain working as front focal length in the case of clear focusing；Utilize auto-focusing algorithm to calculate described focusing lens group focusing on
Estimation position after movement；Current location according to described estimation position and described focus-variable lens group is calculated described focusing and adjusts
Object distance after joint.
Further, before the object distance after determining focus adjustment, described method also includes: obtain described focusing lens group
Current location and the current location of described focus-variable lens group；Current location according to described focusing lens group and described varifocal mirror
The current location of sheet group is calculated works as front focal length in the case of clear focusing；Calculate minimum object distance or maximum object distance
Position and the position of described focusing lens group with the described described focus-variable lens group corresponding when front focal length；Wherein it is determined that focus on
Object distance after regulation includes: be calculated the object distance after described focus adjustment by below equation:
d2=d1+Δd
Wherein, d2Represent the object distance after described focus adjustment, d1Represent described current object distance, d1Initial value be described
Little object distance or described maximum object distance, ΔdRepresent object distance regulated quantity.
Further, when being calculated the first shift position of focusing lens group, calculate the second shifting of focus-variable lens group
Dynamic position includes: obtain current location and the current location of described focus-variable lens group of described focusing lens group；According to described poly-
It is current that the current location of focus lens group and the current location of described focus-variable lens group are calculated in the case of clear focusing
Focal length and current object distance；Focus commands according to user's input calculates the object distance after focus adjustment；After described focus adjustment
Object distance and described when front-focometer calculate obtain described first shift position and described second shift position.
Another aspect provides the focusing arrangement of a kind of video camera, including first computing unit, by based on
When calculating the first shift position obtaining focusing lens group, calculating the second shift position of focus-variable lens group, wherein, described first moves
Dynamic position is described focusing lens group position after the current location of described focusing lens group is moved, described second shift position
For described focus-variable lens group position after the current location of described focus-variable lens group is moved；Mobile unit, for by described poly-
Focus lens group moves to described first shift position, and described focus-variable lens group moves to described second shift position, wherein,
Described focusing lens group moves to described first shift position and described focus-variable lens group moves to described second shift position
Time video camera focal length with mobile before focal length identical.
Further, described computing unit comprises determining that module, the object distance after determining focus adjustment；First calculates
Module, for being calculated described first shift position and described second according to when the object distance after front focal length and described focus adjustment
Shift position.
Further, described computing module is described when the object distance after front focal length and described focus adjustment is from advance for utilizing
On the shot information table set up, computation of table lookup obtains described first shift position and described second shift position, wherein, described mirror
Header table have recorded in the case of clear focusing described focus-variable lens group at position ziAnd object distance is djTime corresponding institute
State the position f of focusing lens groupijWith focal length EFLij, wherein, i takes 1 to n, j and takes 1 to m, and wherein, it is whole that n and m is more than 1
Number.
Further, described device also includes: the second computing unit, for described focusing lens group is moved to described
First shift position, and after described focus-variable lens group is moved to described second shift position, calculate described focusing lens group
Focus value when described first shift position and described focus-variable lens group are in described second shift position, wherein, described poly-
Coke number is for the definition of the image of shooting；Judging unit, for judging whether to find the peak value of focus value；Return unit, use
In without finding described peak value, then using described first shift position as the current location of described focusing lens group, by institute
State the current location as described focus-variable lens group, second shift position, using the object distance after described focus adjustment as current thing
Away from, return the step performing the object distance after determining focus adjustment to redefine the object distance after focus adjustment；Wherein, described movement
If unit is additionally operable to find described peak value, it is determined that go out described focusing lens group corresponding to described peak value and described focus-variable lens
The position of group, moves to the position of described focusing lens group corresponding to described peak value and by described change by described focusing lens group
Focus lens group moves to the position of described focus-variable lens group corresponding to described peak value.
Further, described determine that module includes: first obtains submodule, obtains the current location of described focusing lens group
Current location with described focus-variable lens group；First calculating sub module, for according to the current location of described focusing lens group and
The current location of described focus-variable lens group is calculated works as front focal length in the case of clear focusing；Second calculating sub module,
The estimation position after moving is being focused on for utilizing auto-focusing algorithm to calculate described focusing lens group；3rd calculates submodule
Block, for being calculated the thing after described focus adjustment according to the current location of described estimation position and described focus-variable lens group
Away from.
Further, described device also includes: second obtain submodule, for after determining focus adjustment object distance it
Before, obtain current location and the current location of described focus-variable lens group of described focusing lens group；4th calculating sub module, is used for
Current location and the current location of described focus-variable lens group according to described focusing lens group are calculated in the clear feelings focused on
Front focal length is worked as under condition；5th calculating sub module, is used for calculating minimum object distance or maximum object distance with described when front focal length pair
The position of the described focus-variable lens group answered and the position of described focusing lens group；Wherein, described determine that module comprises determining that submodule
Block, for being calculated the object distance after described focus adjustment by below equation:
d2=d1+Δd
Wherein, d2Represent the object distance after described focus adjustment, d1Represent described current object distance, d1Initial value be described
Little object distance or described maximum object distance, ΔdRepresent object distance regulated quantity.
Further, described first computing unit includes: acquisition module, for obtaining the present bit of described focusing lens group
Put and the current location of described focus-variable lens group；Second computing module, for according to the current location of described focusing lens group and
The current location of described focus-variable lens group be calculated in the case of clear focusing when front focal length and current object distance；3rd meter
Calculate module, for calculating the object distance after focus adjustment according to the focus commands of user's input；4th computing module, for according to institute
State the object distance after focus adjustment and described calculation when front-focometer obtains described first shift position and described second shift position.
According to embodiments of the present invention, during by position after the movement being calculated focusing lens group, calculate varifocal mirror
Position after the movement of sheet group, then moves to corresponding position by focusing lens group and focus-variable lens group, that is to say by moving
The focal length variations that the position of dynamic focus-variable lens group is brought when compensating mobile focusing lens group so that the focal length of video camera is moving
Do not change, it is ensured that the imaging size of the target of shooting is constant, in the case of the hardware module not increasing video camera
Eliminate cell breath, reduce cost.
Accompanying drawing explanation
In order to be illustrated more clearly that the specific embodiment of the invention or technical scheme of the prior art, below will be to specifically
In embodiment or description of the prior art, the required accompanying drawing used is briefly described, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not paying creative work
Put, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the flow chart of a concrete example of the focus method of video camera in the embodiment of the present invention 1；
Fig. 2 is the flow chart of another concrete example of the focus method of video camera in the embodiment of the present invention 1；
Fig. 3 is the flow chart of another concrete example of the focus method of video camera in the embodiment of the present invention 1；
Fig. 4 is the curve chart of climbing method search in the embodiment of the present invention 1；
Fig. 5 is the flow chart of another concrete example of the focus method of video camera in the embodiment of the present invention 1；
Fig. 6 is the curve chart of global search in the embodiment of the present invention 1；
Fig. 7 is the theory diagram of a concrete example of the focusing arrangement of video camera in the embodiment of the present invention 2.
Detailed description of the invention
Below in conjunction with accompanying drawing, technical scheme is clearly and completely described, it is clear that described enforcement
Example is a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under not making creative work premise, broadly falls into the scope of protection of the invention.
If additionally, the most non-structure of technical characteristic involved in invention described below difference embodiment
Become conflict just can be combined with each other.
Embodiment 1
The present embodiment provides the focus method of a kind of video camera, and the method may be used for having motor and drives zoom and focusing
Video camera, this video camera includes focus-variable lens group (zoom) and focusing lens group (focus), drives focus-variable lens group and focusing
The motor of lens set, imageing sensor CMOS/CCD, storage module (record focuses on relevant parameter in focusing), interpolation meter
Calculating module and image definition computing module, image definition computing module can calculate a focus value to every two field picture
(Focus Value, referred to as FV), FV the biggest explanation definition is the highest, and the focus position that the maximum of FV is corresponding is clear
The position focused on.
As it is shown in figure 1, focus method includes:
Step S101, when being calculated the first shift position of focusing lens group, calculates the second shifting of focus-variable lens group
Dynamic position.Wherein, the first shift position is focusing lens group position after the current location of focusing lens group is moved, and second moves
Dynamic position is focus-variable lens group position after the current location of focus-variable lens group is moved.
When being focused, need the position of focusing lens group is adjusted, thus be implemented as the definition as picture
Regulation, therefore, regulation during need calculate focusing lens group movement after that is first shift position, position.Then exist
Iff when moving focusing lens group to realize focusing function, it will usually make the focal length of camera lens also change, to this, this
In embodiment, while calculating the first shift position of focusing lens group, also calculate the position after focus-variable lens group moves i.e.
Second shift position, it is ensured that focusing lens group and focus-variable lens group are before and after movement, and the focal length of video camera does not changes.
Step S102, moves to the first shift position by focusing lens group, and focus-variable lens group is moved to second moves
Position.Wherein, focusing lens group moves to the first shift position and focus-variable lens group moves to shooting during the second shift position
The focal length of machine is identical with the focal length before movement.
After calculating the first shift position and the second shift position, by driving focus motor focusing lens group to be moved
Move the first shift position, drive zoom motor that focus-variable lens group is moved to the second shift position.
According to embodiments of the present invention, during by position after the movement being calculated focusing lens group, calculate varifocal mirror
Position after the movement of sheet group, then moves to corresponding position by focusing lens group and focus-variable lens group, that is to say by moving
The focal length variations that the position of dynamic focus-variable lens group is brought when compensating mobile focusing lens group so that the focal length of video camera is moving
Do not change, it is ensured that the imaging size of the target of shooting is constant, in the case of the hardware module not increasing video camera
Eliminate cell breath, reduce cost.
Preferably, when being calculated the first shift position of focusing lens group, calculate the second of focus-variable lens group and move
Position comprises determining that the object distance after focus adjustment；Move according to when the object distance after front focal length and focus adjustment is calculated first
Position and the second shift position.
Owing to focusing is the process of a search one by one regulation, during regulation every time, object distance also can become
Changing, in the present embodiment, each regulation first determines the object distance after focus adjustment, then utilizes this object distance and when front-focometer calculates first
Shift position and the second shift position.When front focal length is for being focusing front focal length, during regulation, this focal length does not becomes
Change.
Object distance d determined for any one, the z-EFL curve of its correspondence is dull, and wherein, z represents focus-variable lens
The position of group, EFL represents focal length；The z determined for any one, its d-f curve is dull, and wherein, f represents focusing lens
The position of group.According to above character, each known z and d can find out well-determined f and EFL value, can according to z,
F calculates unique corresponding object distance d, (owing to some camera lens fixture is the most dull away from lower f-z curve, so cannot be according to f and d
Calculate z).Unique corresponding focal length EFL can be calculated according to known z, d value, unique corresponding z can be calculated according to d, EFL,
Well-determined f position and EFL can be calculated according to d, EFL.Based on above-mentioned principle, it is possible to use this object distance and work as front focal length
Calculate the first shift position and the second shift position.
Further, move according to when the object distance after front focal length and focus adjustment is calculated the first shift position and second
Position includes: utilize when the computation of table lookup from the shot information table pre-build of the object distance after front focal length and focus adjustment obtains the
One shift position and the second shift position, wherein, have recorded focus-variable lens group in the case of clear focusing in shot information table
At position ziAnd object distance is djTime corresponding focusing lens group position fijWith focal length EFLij, wherein, i take 1 to n, j take 1 to
M, wherein, n and m is the integer more than 1.
Shot information table is as shown in table 1:
Table 1
This table includes tetra-information of z, d, f, EFL, represents the position of focus-variable lens group, object distance, focusing lens group successively
Position, focal length, z in table1、z2、z3To znRepresent the position of n focus-variable lens group, arrange by monotonic increase or in the way of successively decreasing
Row, n is positive integer；d1、d2、d3To dmRepresenting object distance, arrange by monotonic increase or in the way of successively decreasing, m is the sampling of object distance d
Number, for positive integer.Each unit in table has two independent numerical value, is illustrated respectively in the f under the z of its correspondence and object distance d
With focal length EFL.
This shot information table can be obtained by optical model simulation calculation or measurement.For a camera lens it is believed that be somebody's turn to do
Table content determines, the most in time or the change of scene and change.Method according to given value other values of computation of table lookup is with in table
Data interpolating, including all existing interpolation methods such as neighbor interpolation, linear interpolation and non-linear interpolation.By pre-building
Shot information table can calculate desired data rapidly, improve computational efficiency.
As the optional embodiment of one, as in figure 2 it is shown, focusing lens group is being moved to the first shift position, and
After focus-variable lens group is moved to the second shift position, method also includes: calculate focusing lens group in the first shift position with
And the focus value that focus-variable lens group is when the second shift position, wherein, focus value is for the definition of the image of shooting；Judgement is
The no peak value finding focus value；Without finding peak value, then using the first shift position as the current location of focusing lens group,
Using the second shift position as the current location of focus-variable lens group, the object distance after focus adjustment is held as current object distance, return
Row determine focus adjustment after the step of object distance to redefine the object distance after focus adjustment；If finding peak value, it is determined that go out
Focusing lens group that peak value is corresponding and the position of focus-variable lens group, move to the focusing lens group that peak value is corresponding by focusing lens group
Position and focus-variable lens group is moved to the position of focus-variable lens group corresponding to peak value.
Specifically, as in figure 2 it is shown, focus method includes:
Step S201, determines the object distance after focus adjustment.
Step S202, moves according to when the object distance after front focal length and focus adjustment is calculated the first shift position and second
Position.
Step S203, moves to the first shift position by focusing lens group, and focus-variable lens group is moved to second moves
Position.
Step S201 to S203 is shown in the description in above example, does not repeats.
Step S204, calculates focusing lens group when the first shift position and focus-variable lens group are in the second shift position
Focus value.
Focus value (focus value, referred to as FV) may refer to the definition values of the image of shooting, and its value shows the most greatly
Image is the most clear.In the present embodiment, often mobile regulation once, calculates and obtains corresponding focus value, and record, in order to
Carry out peak value judgement.
Step S205, it may be judged whether find the peak value of focus value.Without finding peak value, then perform step S206, instead
It, then perform step S207.After being calculated focus value, carry out peak value inquiry, it may be judged whether peak value can be found every time,
So that subsequent treatment.Wherein, peak value meter diagram picture position the most clearly, i.e. focus on final position to be regulated.
Step S206, using the first shift position as the current location of focusing lens group, using the second shift position as change
The current location of focus lens group, using the object distance after focus adjustment as current object distance, returns and performs step S201 to redefine
Object distance after focus adjustment.When not finding peak value, need again to be adjusted, therefore, return and perform step S201.
Step S207, determines focusing lens group and the position of focus-variable lens group that peak value is corresponding.
Step S208, moves to the position of focusing lens group corresponding to peak value and by focus-variable lens group by focusing lens group
Move to the position of focus-variable lens group corresponding to peak value, automatically focus on and terminate.When finding peak value, determine each eyeglass during peak value
The position of group, then moves to lens set this position, thus realizes automatically focusing on.
Preferably, as it is shown on figure 3, step S201 includes:
Step S2011, obtains current location and the current location of focus-variable lens group of focusing lens group.
Step S2012, is calculated clearly according to the current location of focusing lens group and the current location of focus-variable lens group
Front focal length is worked as in the case of clear focusing.The object distance of present convergence can also be calculated.
Step S2013, utilizes auto-focusing algorithm to calculate focusing lens group and is focusing on the estimation position after moving.Automatically
Focusing algorithm includes all existing auto-focusing algorithm of the automatic amasthenic lens of existing support, including climbing method, full search method
Deng.
Step S2014, is calculated the object distance after focus adjustment according to the current location estimating position and focus-variable lens group.
Preferably, as a example by using climbing method, first obtain the position z1 of current focus-variable lens group and current focus lamp
Sheet group de position f1, calculates clear object distance d1 focused on corresponding to current state and when front focal length EFL according to z1 with f1.
Then use focusing algorithm of climbing the mountain, provide the estimation position f2 ' of next step focusing lens group, as shown in Figure 4.First
First check the FV value i.e. focus value number of record in bin, if number is less than a threshold value, does not reaches criterion, then tie up
Hold the direction of search constant；If number is more than threshold value, it is judged that the trend of nearest several FV values, if FV value is on a declining curve and expires
Foot certain condition, then the direction of search is reverse；If go to the end of hunting zone in current direction, then the direction of search is anti-
To. the estimation position f2 ' of next step focusing lens group is determined according to the direction of search.
Its correspondence is calculated then according to the position z1 of current zoom lens set and the estimation position f2 ' of focusing lens group
Next object distance d2.According to object distance d2 with when front focal length EFL calculates the position z2 of the next focus-variable lens group of correspondence and gathers
The position f2 of focus lens group.
Then drive focus-variable lens group and focusing lens group to move into place z2 and position f2 respectively, and record current change
Focus lens group and the position grouping of focusing lens group and the FV value got on its position.Several FV values of judgement record are
No have peak value, if there being peak value, take out focus-variable lens group corresponding to FV peak and focusing lens group position grouping z and
f.The most respectively z2, f2 and d2 are set to successively the position z1 of current focus-variable lens group, focusing lens group without peak value
Position f1 and object distance d1, return use and climb the mountain focusing algorithm, provide the estimation position f2 ' of next step focusing lens group, again
Carry out the calculating of next round.
If finding out peak value, then focus-variable lens group and focusing lens group is driven to move into place z and position f, process respectively
In focal length EFL need to be kept constant, terminate automatically to focus on.
Alternatively, as it is shown in figure 5, before the object distance after determining focus adjustment, method also includes:
Step S501, obtains current location and the current location of focus-variable lens group of focusing lens group.
Step S502, is calculated clearly according to the current location of focusing lens group and the current location of focus-variable lens group
Front focal length is worked as in the case of focusing.
Step S503, calculate minimum object distance or maximum object distance with when focus-variable lens group corresponding to front focal length position and
The position of focusing lens group.
Step S201 includes: step S2011, below equation be calculated the object distance after focus adjustment:
d2=d1+Δd
Wherein, d2Represent the object distance after focus adjustment, d1Represent current object distance, d1Initial value be minimum object distance or
Big object distance, ΔdRepresent object distance regulated quantity.When starting to search for from minimum object distance, ΔdFor on the occasion of, otherwise, but open from maximum object distance
When beginning to search for, ΔdFor negative value.ΔdCan be fixed value, it is also possible to be object distance d1Function, this function can be with d1Increase and
Increase.
The present embodiment uses full search method.For short-focus lens, focal length EFL is less than 10 millimeter, supervises being used for
Under the scenes such as control, video conference and daily life shooting, its focusing search range is the least, now uses global search FV peak
The method of value, can keep being rapidly completed focused search.Existing global search scans the focus-of whole focusing search range
FV curve, then finds the peak value of FV, drives focusing lens group to go to this position.Object distance d is then become by the present embodiment as search
Amount, as shown in Figure 6, in search procedure, fixed focal length EFL is constant, drives focusing lens group to scan whole object distance range, simultaneously
In scanning process, mobile focus-variable lens group compensates.Obtain the d-FV curve of whole object distance range, when finding the peak value of FV pair
The focusing lens group answered and the position of focus-variable lens group, drive focusing lens group and focus-variable lens group to go to this position.
Specifically, first obtain the position z1 and current focusing lens group de position f1 of current focus-variable lens group, according to
Z1 with f1 calculates clear object distance d1 focused on corresponding to current state and when front focal length EFL.
Then from minimum object distance dminIf (according to the object distance direction of search from big to small, being from maximum object distance dmax, dmin
From the beginning of the minimum object distance that application needs, the minimum object distance supported more than camera lens；dmaxIt is actually used maximum object distance, permissible
Infinity is replaced, such as 100 meters, 200 meters by a larger distance approximation) start, calculate focal length EFL and minimum object distance dmin
Corresponding focusing lens group and the position of focus-variable lens group, drive focusing lens group and focus-variable lens group to go to this position, walking
Process in shot information table, search a path adjusting focusing lens group and focus-variable lens group to keep EFL constant.
Next object distance d is then set2, d2=d1+Δd, d1Initial value be minimum object distance dminOr maximum object distance dmax,
ΔdIt is the regulated quantity of object distance, can be fixed value, it is also possible to be object distance d1Function, typically with d1Increase and increase.According to
Object distance d2Position z with next step focusing lens group calculating correspondence when front focal length EFL2Position f with focus-variable lens group2.Point
Focusing lens group and focus-variable lens group Qu Dong not move into place z2With position f2, and record current location focusing lens group and
The position grouping of focus-variable lens group and the FV value got on its position.
Then judge whether that covering whole object distance hunting zone (if searched for from small to large according to object distance, needs to go to dmax,
If according to searching for from big to small, it is to go to dmin), if covering hunting zone, take out the focus lamp that FV peak is corresponding
Position grouping z and f of sheet group and focus-variable lens group.Without covering whole object distance range the most respectively by z2, f2 and d2 the most successively
It is set to the position z1 of current focus-variable lens group, the position f1 of focusing lens group and object distance d1, and return re-searches for the next one
Object distance.
If finding out peak value, then focus-variable lens group and focusing lens group is driven to move into place z and position f, process respectively
In focal length EFL need to be kept constant, terminate automatically to focus on.During whole focused search, focal length EFL keeps constant.
Alternatively, the focus method of the embodiment of the present invention can be also used for Manual focusing, wherein, is being calculated focus lamp
During the first shift position of sheet group, the second shift position calculating focus-variable lens group includes: obtain the present bit of focusing lens group
Put and the current location of focus-variable lens group；Current location and the current location of focus-variable lens group according to focusing lens group calculate
To in the case of clear focusing when front focal length and current object distance；After focus commands according to user's input calculates focus adjustment
Object distance；According to the object distance after focus adjustment with when front-focometer calculation obtains the first shift position and the second shift position.
Manual focusing and the difference automatically focused on essentially consist in the determination mode of the object distance after regulation, in the mistake of Manual focusing
Cheng Zhong, the object distance after regulation is that the focus commands inputted by user obtains, and automatically focuses on, is to utilize auto-focusing algorithm
Calculate.During Manual focusing, when user operation is poly-remote or gathers near, first calculate current focal length EFL, with
And object distance d that current zoom lens set is corresponding with the position of focusing lens1, calculate next thing according to the order of user's input
Away from d2, keep focal length constant, from shot information table, find out next focus-variable lens group and the position of focusing lens of correspondence,
Then focus-variable lens group and focusing lens is driven to be moved respectively to corresponding position.
Description according to the above embodiment of the present invention is it can be seen that the present invention can reach following technique effect:
1, existing support is focused on and the video camera of zoom, do not increase or revise any hardware, it is not necessary at image
Reason module, by focusing compensate focal length variations, can realize fixed focal length constant in the case of be focused search, thus
Eliminate " cell breath ".
2. scaling due to nil, output image is without resolution loss.
Embodiment 2
Originally execute example and provide the focusing arrangement of a kind of video camera, as it is shown in fig. 7, this device includes: the first computing unit 10 He
Mobile unit 20.
First computing unit 10, for when being calculated the first shift position of focusing lens group, calculates focus-variable lens group
The second shift position, wherein, the first shift position is focusing lens group position after the current location of focusing lens group is moved
Putting, the second shift position is focus-variable lens group position after the current location of focus-variable lens group is moved.
When being focused, need the position of focusing lens group is adjusted, thus be implemented as the definition as picture
Regulation, therefore, regulation during need calculate focusing lens group movement after that is first shift position, position.Then exist
Iff when moving focusing lens group to realize focusing function, it will usually make the focal length of camera lens also change, to this, this
In embodiment, while calculating the first shift position of focusing lens group, also calculate the position after focus-variable lens group moves i.e.
Second shift position, it is ensured that focusing lens group and focus-variable lens group are before and after movement, and the focal length of video camera does not changes.
Mobile unit 20 for moving to the first shift position by focusing lens group, and focus-variable lens group is moved to second
Shift position, wherein, focusing lens group moves to the first shift position and time focus-variable lens group moves to the second shift position
The focal length of video camera is identical with the focal length before movement.
After calculating the first shift position and the second shift position, by driving focus motor focusing lens group to be moved
Move the first shift position, drive zoom motor that focus-variable lens group is moved to the second shift position.
According to embodiments of the present invention, during by position after the movement being calculated focusing lens group, calculate varifocal mirror
Position after the movement of sheet group, then moves to corresponding position by focusing lens group and focus-variable lens group, that is to say by moving
The focal length variations that the position of dynamic focus-variable lens group is brought when compensating mobile focusing lens group so that the focal length of video camera is moving
Do not change, it is ensured that the imaging size of the target of shooting is constant, in the case of the hardware module not increasing video camera
Eliminate cell breath, reduce cost.
Preferably, computing unit comprises determining that module, the object distance after determining focus adjustment；First computing module, uses
In being calculated the first shift position and the second shift position according to when the object distance after front focal length and focus adjustment.
Owing to focusing is the process of a search one by one regulation, during regulation every time, object distance also can become
Changing, in the present embodiment, each regulation first determines the object distance after focus adjustment, then utilizes this object distance and when front-focometer calculates first
Shift position and the second shift position.When front focal length is for being focusing front focal length, during regulation, this focal length does not becomes
Change.
Object distance d determined for any one, the z-EFL curve of its correspondence is dull, and wherein, z represents focus-variable lens
The position of group, EFL represents focal length；The z determined for any one, its d-f curve is dull, and wherein, f represents focusing lens
The position of group.According to above character, each known z and d can find out well-determined f and EFL value, can according to z,
F calculates unique corresponding object distance d, (owing to some camera lens fixture is the most dull away from lower f-z curve, so cannot be according to f and d
Calculate z).Unique corresponding focal length EFL can be calculated according to known z, d value, unique corresponding z can be calculated according to d, EFL,
Well-determined f position and EFL can be calculated according to d, EFL.Based on above-mentioned principle, it is possible to use this object distance and work as front focal length
Calculate the first shift position and the second shift position.
Further, computing module is for utilizing when the object distance after front focal length and focus adjustment is from the camera lens letter pre-build
On breath table, computation of table lookup obtains the first shift position and the second shift position, wherein, have recorded clear poly-in shot information table
In the case of Jiao, focus-variable lens group is at position ziAnd object distance is djTime corresponding focusing lens group position fijWith focal length EFLij,
Wherein, i takes 1 to n, j and takes 1 to m, and wherein, n and m is the integer more than 1.
This shot information table can be obtained by optical model simulation calculation or measurement.For a camera lens it is believed that be somebody's turn to do
Table content determines, the most in time or the change of scene and change.Method according to given value other values of computation of table lookup is with in table
Data interpolating, including all existing interpolation methods such as neighbor interpolation, linear interpolation and non-linear interpolation.By pre-building
Shot information table can calculate desired data rapidly, improve computational efficiency.
As the optional embodiment of one, device also includes:
Second computing unit, for focusing lens group is moving to the first shift position, and moves focus-variable lens group
After the second shift position, calculate focusing lens group the first shift position and focus-variable lens group in the second shift position time
Focus value, wherein, focus value is for the definition of image of shooting.Focus value (focus value, referred to as FV) can be
Referring to the definition values of the image of shooting, its value shows that the most greatly image is the most clear.In the present embodiment, often mobile regulation once, calculates
And obtain corresponding focus value, and record, in order to carry out peak value judgement.
Judging unit, for judging whether to find the peak value of focus value；
Return unit, for without finding peak value, then using the first shift position as the present bit of focusing lens group
Put, using the second shift position as the current location of focus-variable lens group, using the object distance after focus adjustment as current object distance, return
Perform the step of the object distance after determining focus adjustment to redefine the object distance after focus adjustment.It is being calculated focus value every time
Afterwards, peak value inquiry is carried out, it may be judged whether peak value can be found, in order to subsequent treatment.Wherein, peak value meter diagram picture is the most clear
Position, i.e. focus on final position to be regulated.
If mobile unit is additionally operable to find peak value, it is determined that go out focusing lens group corresponding to peak value and focus-variable lens group
Position, moves to focusing lens group the position of focusing lens group corresponding to peak value and focus-variable lens group is moved to peak value pair
The position of the focus-variable lens group answered.When finding peak value, determine the position of each lens set during peak value, then lens set is moved
To this position, thus realize automatically focusing on.
Preferably, determine that module includes:
First obtains submodule, obtains current location and the current location of focus-variable lens group of focusing lens group；
First calculating sub module, calculates for the current location of the current location according to focusing lens group and focus-variable lens group
Obtain working as front focal length in the case of clear focusing；Can be also used for calculating the object distance of present convergence.
Second calculating sub module, is focusing on the estimation after moving for utilizing auto-focusing algorithm to calculate focusing lens group
Position；Auto-focusing algorithm includes all existing auto-focusing algorithm of the automatic amasthenic lens of existing support, including climbing method, entirely
Office's search method etc..
3rd calculating sub module, for being calculated focus adjustment according to the current location estimating position and focus-variable lens group
After object distance.
Alternatively, device also includes:
Second obtains submodule, before the object distance after determining focus adjustment, obtains the present bit of focusing lens group
Put and the current location of focus-variable lens group；
4th calculating sub module, calculates for the current location of the current location according to focusing lens group and focus-variable lens group
Obtain working as front focal length in the case of clear focusing；
5th calculating sub module, for calculate minimum object distance or maximum object distance with when focus-variable lens corresponding to front focal length
The position of group and the position of focusing lens group；
Wherein it is determined that module comprises determining that submodule, for being calculated the object distance after focus adjustment by below equation:
d2=d1+Δd
Wherein, d2Represent the object distance after focus adjustment, d1Represent current object distance, d1Initial value be minimum object distance or
Big object distance, ΔdRepresent object distance regulated quantity.When starting to search for from minimum object distance, ΔdFor on the occasion of, otherwise, but open from maximum object distance
When beginning to search for, ΔdFor negative value.ΔdCan be fixed value, it is also possible to be object distance d1Function, this function can be with d1Increase and
Increase.
The present embodiment uses full search method.For short-focus lens, focal length EFL is less than 10 millimeter, supervises being used for
Under the scenes such as control, video conference and daily life shooting, its focusing search range is the least, now uses global search FV peak
The method of value, can keep being rapidly completed focused search.Existing global search scans the focus-of whole focusing search range
FV curve, then finds the peak value of FV, drives focusing lens group to go to this position.Object distance d is then become by the present embodiment as search
Amount, as shown in Figure 6, in search procedure, fixed focal length EFL is constant, drives focusing lens group to scan whole object distance range, simultaneously
In scanning process, mobile focus-variable lens group compensates.Obtain the d-FV curve of whole object distance range, when finding the peak value of FV pair
The focusing lens group answered and the position of focus-variable lens group, drive focusing lens group and focus-variable lens group to go to this position.
Alternatively, the focus method of the embodiment of the present invention can be also used for Manual focusing, wherein, and the first computing unit bag
Include:
Acquisition module, for obtaining current location and the current location of focus-variable lens group of focusing lens group；
Second computing module, for calculating according to the current location of focusing lens group and the current location of focus-variable lens group
To in the case of clear focusing when front focal length and current object distance；
3rd computing module, for calculating the object distance after focus adjustment according to the focus commands of user's input；
4th computing module, for according to the object distance after focus adjustment and when front-focometer calculate obtain the first shift position and
Second shift position.
Manual focusing and the difference automatically focused on essentially consist in the determination mode of the object distance after regulation, in the mistake of Manual focusing
Cheng Zhong, the object distance after regulation is that the focus commands inputted by user obtains, and automatically focuses on, is to utilize auto-focusing algorithm
Calculate.During Manual focusing, when user operation is poly-remote or gathers near, first calculate current focal length EFL, with
And object distance d that current zoom lens set is corresponding with the position of focusing lens1, calculate next thing according to the order of user's input
Away from d2, keep focal length constant, from shot information table, find out next focus-variable lens group and the position of focusing lens of correspondence,
Then focus-variable lens group and focusing lens is driven to be moved respectively to corresponding position.
Description according to the above embodiment of the present invention is it can be seen that the present invention can reach following technique effect:
1, existing support is focused on and the video camera of zoom, does not increases or revise any hardware,
Without image processing module, compensate focal length variations by focusing, fixed focal length can be realized not
It is focused search in the case of change, thus eliminates " cell breath ".
2. scaling due to nil, output image is without resolution loss.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the reality in terms of the present invention can use complete hardware embodiment, complete software implementation or combine software and hardware
Execute the form of example.And, the present invention can use at one or more computers wherein including computer usable program code
The upper computer program product implemented of usable storage medium (including but not limited to disk memory, CD-ROM, optical memory etc.)
The form of product.
The present invention is with reference to method, equipment (system) and the flow process of computer program according to embodiments of the present invention
Figure and/or block diagram describe.It should be understood that can the most first-class by computer program instructions flowchart and/or block diagram
Flow process in journey and/or square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
Instruction arrives the processor of general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce
A raw machine so that the instruction performed by the processor of computer or other programmable data processing device is produced for real
The device of the function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame now.
These computer program instructions may be alternatively stored in and computer or other programmable data processing device can be guided with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in this computer-readable memory produces and includes referring to
Make the manufacture of device, this command device realize at one flow process of flow chart or multiple flow process and/or one square frame of block diagram or
The function specified in multiple square frames.
These computer program instructions also can be loaded in computer or other programmable data processing device so that at meter
Perform sequence of operations step on calculation machine or other programmable devices to produce computer implemented process, thus at computer or
The instruction performed on other programmable devices provides for realizing at one flow process of flow chart or multiple flow process and/or block diagram one
The step of the function specified in individual square frame or multiple square frame.
Obviously, above-described embodiment is only for clearly demonstrating example, and not restriction to embodiment.Right
For those of ordinary skill in the field, can also make on the basis of the above description other multi-form change or
Variation.Here without also cannot all of embodiment be given exhaustive.And the obvious change thus extended out or
Change among still in the protection domain of the invention.
Claims (14)
1. the focus method of a video camera, it is characterised in that including:
When being calculated the first shift position of focusing lens group, calculate the second shift position of focus-variable lens group, wherein, institute
Stating the first shift position is described focusing lens group position after the current location of described focusing lens group is moved, described second
Shift position is described focus-variable lens group position after the current location of described focus-variable lens group is moved；
Described focusing lens group is moved to described first shift position, and described focus-variable lens group is moved to described second shifting
Dynamic position, wherein, described focusing lens group moves to described first shift position and described focus-variable lens group moves to described
During the second shift position, the focal length of video camera is identical with the focal length before movement.
Method the most according to claim 1, it is characterised in that in the first shift position being calculated focusing lens group
Time, the second shift position calculating focus-variable lens group includes:
Determine the object distance after focus adjustment；
Move according to when the object distance after front focal length and described focus adjustment is calculated described first shift position and described second
Position.
Method the most according to claim 2, it is characterised in that according to described when the thing after front focal length and described focus adjustment
Include away from being calculated described first shift position and described second shift position:
Obtain when the computation of table lookup from the shot information table pre-build of the object distance after front focal length and described focus adjustment described in utilizing
To described first shift position and described second shift position, wherein, described shot information table have recorded in clear focusing
In the case of described focus-variable lens group at position ziAnd object distance is djTime corresponding described focusing lens group position fijAnd focal length
EFLij, wherein, i takes 1 to n, j and takes 1 to m, and wherein, n and m is the integer more than 1.
The most according to the method in claim 2 or 3, it is characterised in that described focusing lens group is being moved to described first
Shift position, and after described focus-variable lens group is moved to described second shift position, described method also includes:
Calculate described focusing lens group in described first shift position and described focus-variable lens group in described second shift position
Time focus value, wherein, described focus value is for the definition of image of shooting；
Judge whether to find the peak value of focus value；
Without finding described peak value, then using described first shift position as the current location of described focusing lens group, incite somebody to action
Described second shift position is as the current location of described focus-variable lens group, using the object distance after described focus adjustment as current thing
Away from, return the step performing the object distance after determining focus adjustment to redefine the object distance after focus adjustment；
If finding described peak value, it is determined that go out described focusing lens group corresponding to described peak value and the position of described focus-variable lens group
Put, described focusing lens group is moved to the position of described focusing lens group corresponding to described peak value and by described focus-variable lens
Group moves to the position of described focus-variable lens group corresponding to described peak value.
Method the most according to claim 4, it is characterised in that determine that the object distance after focus adjustment includes:
Obtain current location and the current location of described focus-variable lens group of described focusing lens group；
Current location and the current location of described focus-variable lens group according to described focusing lens group are calculated and focus on clear
In the case of work as front focal length；
Utilize auto-focusing algorithm to calculate described focusing lens group and focus on the estimation position after moving；
Current location according to described estimation position and described focus-variable lens group is calculated the object distance after described focus adjustment.
Method the most according to claim 4, it is characterised in that
Before object distance after determining focus adjustment, described method also includes:
Obtain current location and the current location of described focus-variable lens group of described focusing lens group；
Current location and the current location of described focus-variable lens group according to described focusing lens group are calculated and focus on clear
In the case of work as front focal length；
Calculate minimum object distance or maximum object distance and the position of the described described focus-variable lens group corresponding when front focal length and described
The position of focusing lens group；
Wherein it is determined that the object distance after focus adjustment includes: be calculated the object distance after described focus adjustment by below equation:
d2=d1+Δd
Wherein, d2Represent the object distance after described focus adjustment, d1Represent described current object distance, d1Initial value be described minimum thing
Away from or described maximum object distance, ΔdRepresent object distance regulated quantity.
Method the most according to claim 1, it is characterised in that in the first shift position being calculated focusing lens group
Time, the second shift position calculating focus-variable lens group includes:
Obtain current location and the current location of described focus-variable lens group of described focusing lens group；
Current location and the current location of described focus-variable lens group according to described focusing lens group are calculated and focus on clear
In the case of when front focal length and current object distance；
Focus commands according to user's input calculates the object distance after focus adjustment；
According to the object distance after described focus adjustment and described when front-focometer calculate obtain described first shift position and described second
Shift position.
8. the focusing arrangement of a video camera, it is characterised in that including:
First computing unit, for when being calculated the first shift position of focusing lens group, calculates the of focus-variable lens group
Two shift positions, wherein, described first shift position is that described focusing lens group is moved from the current location of described focusing lens group
Position after Dong, described second shift position is that described focus-variable lens group is after the current location of described focus-variable lens group is moved
Position；
Mobile unit, for described focusing lens group moves to described first shift position, and moves described focus-variable lens group
Moving described second shift position, wherein, described focusing lens group moves to described first shift position and described varifocal mirror
It is identical with the focal length before movement that sheet group moves to the focal length of video camera during described second shift position.
Device the most according to claim 8, it is characterised in that described computing unit includes:
Determine module, the object distance after determining focus adjustment；
First computing module, for according to moving position when the object distance after front focal length and described focus adjustment is calculated described first
Put and described second shift position.
Device the most according to claim 9, it is characterised in that described computing module be used for utilizing described when front focal length and
Object distance after described focus adjustment computation of table lookup from the shot information table pre-build obtains described first shift position and institute
State the second shift position, wherein, described shot information table have recorded described focus-variable lens group in the case of clear focusing and exist
Position ziAnd object distance is djTime corresponding described focusing lens group position fijWith focal length EFLij, wherein, i takes 1 to n, j and takes 1
To m, wherein, n and m is the integer more than 1.
11. devices according to claim 8 or claim 9, it is characterised in that described device also includes:
Second computing unit, for moving to described first shift position by described focusing lens group, and by described varifocal mirror
After sheet group moves to described second shift position, calculate described focusing lens group in described first shift position and described change
The focus lens group focus value when described second shift position, wherein, described focus value is for the definition of the image of shooting；
Judging unit, for judging whether to find the peak value of focus value；
Return unit, for without finding described peak value, then using described first shift position as described focusing lens group
Current location, using described second shift position as the current location of described focus-variable lens group, after described focus adjustment
Object distance as current object distance, returns the step performing the object distance after determining focus adjustment to redefine the thing after focus adjustment
Away from；
Wherein, if described mobile unit is additionally operable to find described peak value, it is determined that go out the described focus lamp that described peak value is corresponding
Sheet group and the position of described focus-variable lens group, move to the described focusing lens group that described peak value is corresponding by described focusing lens group
Position and described focus-variable lens group is moved to the position of described focus-variable lens group corresponding to described peak value.
12. devices according to claim 11, it is characterised in that described determine that module includes:
First obtains submodule, obtains current location and the current location of described focus-variable lens group of described focusing lens group；
First calculating sub module, for the current location according to described focusing lens group and the current location of described focus-variable lens group
It is calculated and works as front focal length in the case of clear focusing；
Second calculating sub module, is focusing on the estimation after moving for utilizing auto-focusing algorithm to calculate described focusing lens group
Position；
3rd calculating sub module, described for being calculated according to the current location of described estimation position and described focus-variable lens group
Object distance after focus adjustment.
13. devices according to claim 11, it is characterised in that described device also includes:
Second obtains submodule, before the object distance after determining focus adjustment, obtains the present bit of described focusing lens group
Put and the current location of described focus-variable lens group；
4th calculating sub module, for the current location according to described focusing lens group and the current location of described focus-variable lens group
It is calculated and works as front focal length in the case of clear focusing；
5th calculating sub module, for calculating minimum object distance or maximum object distance and the described described zoom corresponding when front focal length
The position of lens set and the position of described focusing lens group；
Wherein, described determine that module comprises determining that submodule, for being calculated the thing after described focus adjustment by below equation
Away from:
d2=d1+Δd
Wherein, d2Represent the object distance after described focus adjustment, d1Represent described current object distance, d1Initial value be described minimum thing
Away from or described maximum object distance, ΔdRepresent object distance regulated quantity.
14. devices according to claim 8, it is characterised in that described first computing unit includes:
Acquisition module, for obtaining current location and the current location of described focus-variable lens group of described focusing lens group；
Second computing module, based on the current location of the current location according to described focusing lens group and described focus-variable lens group
Calculate obtain in the case of clear focusing when front focal length and current object distance；
3rd computing module, for calculating the object distance after focus adjustment according to the focus commands of user's input；
4th computing module, for according to the object distance after described focus adjustment and described when front-focometer calculate obtain described first move
Dynamic position and described second shift position.
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