CN106610553A - A method and apparatus for auto-focusing - Google Patents
A method and apparatus for auto-focusing Download PDFInfo
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
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Abstract
The present invention provides a method and an apparatus for auto-focusing. The method for auto-focusing comprises the steps of: acquiring scene depth information of an imaging object in a current scene; determining a control voltage of an imaging optical system based on a calibration relationship between the scene depth information and the control voltage of the imaging optical system; and controlling auto-focusing of the imaging optical system through using the control voltage. In the embodiment of the present invention, the control voltage is determined directly based on the scene depth information of the imaging object in the current scene by the calibration relationship between the scene depth information and the control voltage of the imaging optical system, so that the auto-focusing can be directly realized in accordance with the control voltage; rapid focusing is realized without mechanical movements; power consumption of the optical system is reduced; and the usage life of the optical system is prolonged.
Description
Technical field
The present invention relates to technical field of imaging, more particularly to a kind of method and device of auto-focusing.
Background technology
Imaging system is respectively provided with irreplaceability, auto-focusing unit (device in national defence, scientific research and life
And method) it is one of critical function module of imaging system, its life-span, power consumption and size all receive much concern.
Common auto-focusing unit (such as voice coil motor VCM etc.) is all to change image distance to realize by mechanical movement
Focusing, life-span, power consumption and size have significant limitation.
The content of the invention
It is an object of the invention to provide a kind of method and device of auto-focusing, solves existing focusing side
Limitation of the method to the life-span, power consumption and size of imaging optical system.
In order to achieve the above object, the embodiment of the present invention provides a kind of method of auto-focusing, for imaging
System, including：
Obtain the depth information of scene of imaging object under current scene；
According to the demarcation relation between the control voltage of the depth information of scene and the imaging optical system,
Determine the control voltage of the imaging optical system；
The imaging optical system auto-focusing is controlled using the control voltage.
Wherein, the depth information of scene step for obtaining imaging object under current scene includes：
Under current scene, first defocusing degree and second pair of coke-like of imaging object when obtaining the first focusing state
Second defocusing degree of imaging object during state；
The scene depth of the imaging object is determined according to first defocusing degree and second defocusing degree
Information.
Wherein, between the control voltage according to the depth information of scene and the imaging optical system
The step of demarcation relation, control voltage for determining the imaging optical system, includes：
Obtain the demarcation relation between the control voltage of the depth information of scene and the imaging optical system；
According to the depth information of scene and the demarcation relation, the control of the imaging optical system is determined
Voltage.
Wherein, it is described to obtain between the depth information of scene and the control voltage of the imaging optical system
The step of demarcation relation, includes：
Obtain the first demarcation relation between the focal length and the control voltage of imaging optical system of imaging optical system；
Obtain the second demarcation relation between the object distance and the focal length of imaging optical system of imaging optical system；
Obtain the 3rd demarcation relation between the object distance and the depth information of scene of imaging object of imaging optical system；
The scene depth is determined according to the first demarcation relation, the second demarcation relation and the 3rd demarcation relation
Demarcation relation between the control voltage of degree information and the imaging optical system.
Wherein, the between the focal length and the control voltage of imaging optical system for obtaining imaging optical system
The step of one demarcation relation, includes：
Obtain the expression formula of the focal length of imaging optical system；
According to root-mean-square value RMS, described in when determining the minimum focus of imaging optical system and recording minimum focus
The control voltage of imaging optical system is minimum control voltage；
On the basis of the minimum control voltage, control voltage described in consecutive variations simultaneously records each control electricity
The focal length of pressure, so that it is determined that between the control voltage of the focal length and imaging optical system of imaging optical system
First demarcates relation.
Wherein, the second mark between the object distance and the focal length of imaging optical system for obtaining imaging optical system
The step of determining relation includes：
Based on Gauss imaging theory, obtain between the object distance and the focal length of imaging optical system of imaging optical system
Second demarcation relation.
Wherein, the between the object distance and the depth information of scene of imaging object for obtaining imaging optical system
The step of three demarcation relations, includes：
Imaging object is positioned at different object distances；
The depth information of scene of the imaging object at each object distance is obtained respectively；
The mapping relations one by one of the object distance and the depth information of scene are set up, the mapping relations one by one are
Described 3rd demarcates relation.
The embodiment of the present invention also provides a kind of device of auto-focusing, for imaging optical system, including：
Acquisition module, for obtaining the depth information of scene of imaging object under current scene；
Determining module, for the control voltage according to the depth information of scene and the imaging optical system it
Between demarcation relation, determine the control voltage of the imaging optical system；
Focusing module, for controlling the imaging optical system auto-focusing using the control voltage.
Wherein, the acquisition module includes：
First acquisition submodule, under current scene, the first of imaging object when obtaining the first focusing state
Second defocusing degree of imaging object when defocusing degree and the second focusing state；
Second acquisition submodule, for determining institute according to first defocusing degree and second defocusing degree
State the depth information of scene of imaging object.
Wherein, the determining module includes：
Acquisition module, for obtain the depth information of scene and the imaging optical system control voltage it
Between demarcation relation；
Determination sub-module, for according to the depth information of scene and the demarcation relation, determine it is described into
The control voltage of image optical system.
Wherein, the acquisition module includes：
First acquisition submodule, for obtaining the control electricity of the focal length of imaging optical system and imaging optical system
The first demarcation relation between pressure；
Second acquisition submodule, for obtain the object distance of imaging optical system and imaging optical system focal length it
Between second demarcation relation；
3rd acquisition submodule, for obtaining the scene depth letter of the object distance of imaging optical system and imaging object
The 3rd demarcation relation between breath；
4th acquisition submodule, for demarcating relation, the second demarcation relation and the 3rd mark according to described first
Determine relation and determine the demarcation relation between the control voltage of the depth information of scene and the imaging optical system.
Wherein, first acquisition submodule includes：
Acquiring unit, for obtaining the expression formula of the focal length of imaging optical system；
First recording unit, for according to root-mean-square value RMS, determining the minimum focus of imaging optical system simultaneously
During record minimum focus, the control voltage of the imaging optical system is minimum control voltage；
Second recording unit, on the basis of the minimum control voltage, control voltage described in consecutive variations
And the focal length under each control voltage is recorded, so that it is determined that the focal length of imaging optical system and image opticss system
The first demarcation relation between the control voltage of system.
Wherein, second acquisition submodule includes：
Gauss demarcates unit, for based on Gauss imaging theory, obtaining object distance and the imaging of imaging optical system
The second demarcation relation between the focal length of optical system.
Wherein, the 3rd acquisition submodule includes：
Placement unit, for imaging object is positioned at different object distances；
Depth unit, for obtaining the depth information of scene of the imaging object at each object distance respectively；
Relation sets up unit, for setting up the mapping relations one by one of the object distance and the depth information of scene,
The mapping relations one by one are the described 3rd demarcation relation.
The above-mentioned technical proposal of the present invention at least has the advantages that：
In the method and device of the auto-focusing of the embodiment of the present invention, by depth information of scene and image opticss
Demarcation relation between the control voltage of system, directly believes according to the scene depth of imaging object under current scene
Breath determines control voltage such that it is able to directly realizes auto-focusing according to control voltage, realizes rapid focus
And not by mechanical movement come realize focusing, reduce imaging optical system power consumption, extend imaging optical system
Life-span.
Description of the drawings
Fig. 1 represents the basic step flow chart of the method for auto-focusing provided in an embodiment of the present invention；
Fig. 2 obtains the concrete steps of demarcation relation in representing the method for auto-focusing provided in an embodiment of the present invention
Flow chart；
Fig. 3 obtains demarcation relation in representing the concrete application of the method for auto-focusing provided in an embodiment of the present invention
Detailed process figure；
Fig. 4 represents the composition structure chart of the device of auto-focusing provided in an embodiment of the present invention.
Specific embodiment
To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with attached
Figure and specific embodiment are described in detail.
The present invention has to life-span of imaging optical system, power consumption and size for focusing method of the prior art
A kind of problem of significant limitations, there is provided method and device of auto-focusing, by depth information of scene with into
Demarcation relation between the control voltage of image optical system, the directly scene according to imaging object under current scene
Depth information determines control voltage such that it is able to directly realize auto-focusing according to control voltage, realizes fast
Speed focusing and not by mechanical movement come realize focusing, reduce imaging optical system power consumption, extend imaging
Learn system lifetim.
As shown in figure 1, the embodiment of the present invention provides a kind of method of auto-focusing, for imaging optical system,
Including：
Step 11, obtains the depth information of scene of imaging object under current scene；
Step 12, according to the mark between the control voltage of the depth information of scene and the imaging optical system
Determine relation, determine the control voltage of the imaging optical system；
Step 13, controls the imaging optical system auto-focusing using the control voltage.
In the above embodiment of the present invention, scene depth is exactly the definition range before and after focus, and scene depth is got over
Greatly, whole image will be more clear from distant view to close shot；Scene depth is more shallow, and focus main body is clear and prospect
More will blur with background, so as to more stressing main.The factor of scene depth is affected to be mainly focal length, aperture
And shooting distance.Focal length is longer, and aperture is bigger, and shooting distance is nearer, then scene depth is more shallow；Conversely,
Focal length is shorter, and aperture is less, and shooting distance is more remote, then scene depth is bigger.
Generally two magnitudes of voltage of the control voltage of its imaging optical system are (V1, V2), by image opticss
The focusing voltage of system realizes the auto-focusing of imaging optical system by being set to above-mentioned two magnitude of voltage.
Therefore relation is demarcated according to one in the embodiment of the present invention, control voltage can be obtained according to depth information of scene directly,
So as to realize rapid focus.
Atomatic focusing method provided in an embodiment of the present invention, realizes focusing without the need for by mechanical movement, it is only necessary to
Rapid focus are capable of achieving by way of changing control voltage；Reduce the power consumption of imaging optical system, extend
The life-span of imaging optical system, and improve focusing speed.
Further, in the embodiment of the present invention, step 11 includes：
Step 111, under current scene, the first defocusing degree of imaging object and the when obtaining the first focusing state
Second defocusing degree of imaging object during two focusing states；
Step 112, determines the imaging object according to first defocusing degree and second defocusing degree
Depth information of scene.
The above embodiment of the present invention calculates depth information of scene using the method for range of defocusing DFD.Specifically
, DFD be one by object the defocusing degree of defocus condition difference come the method that calculates depth.Its
In, when an object be in focal plane when, object can present one clearly as.And work as object distance pair
During one segment distance of focal plane, image objects gradually can be obscured, we term it object is in defocus condition.Thing
Body is more remote apart from focal plane, then defocusing degree is heavier.Therefore it is right in difference according to object under same scene
Difference degree of defocusing degree during coke-like state is speculating the scene depth of object.
The method of general DFD is to calculate depth according to two figures.By the image distance or the Jiao that change imaging system
Away from obtaining imaging 1 of the same scene under two different focus states respectively, imaging 2；Then using many
Group narrow band filter (pass-band filter), or FRACTIONAL FILTER (rational filter) etc. obtains scene
Relative degree of defocusing.Object is into one-to-one relationship within the specific limits relative to degree of defocusing and scene depth
, therefore a range of scene depth can be calculated by this method.
Preferably, its first focusing state may be configured as focal length for minimum focus fminState, now imaging
System in this case may be used in the fuzzy state of prospect clear (focusing to most front scene) and background
Obtain image I-F；Its second focusing state may be configured as focal length for maximum focal length fmaxState, be now imaged
The state that optical system is obscured in background clear (focusing to last scene) and prospect, in this case
Image I-B can be obtained.The defocusing degree of the defocusing degree and image I-B of image I-F can be individually obtained subsequently,
The relative defocusing degree of image I-F and image I-B can be also obtained, so that field is determined according to the defocusing degree for obtaining
Depth of field degree.And under normal circumstances, above-mentioned depth bounds is that focusing when generating image I-F and image I-B is put down
Depth between face.
It should be noted that the focusing state of its minimum focus and maximum focal length is only a preferable reality of the application
Example is applied, the image that other arbitrary focusing states being located between maximum focal length and minimum focus are obtained can use
To calculate scene depth, here differs a citing.
Preferably, step 12 includes in the above embodiment of the present invention：
Step 121, obtains the mark between the depth information of scene and the control voltage of the imaging optical system
Determine relation；
Step 122, according to the depth information of scene and the demarcation relation, determines the image opticss system
The control voltage of system.
Due between depth information of scene and the control voltage of imaging optical system in the above embodiment of the present invention
Demarcation relation be not prior art content, therefore in order to smoothly realize the present invention offer auto-focusing,
The demarcation relation between depth information of scene and control voltage need to first be determined, a functional relationship is generally available and is represented；
So as to the depth information of scene obtained in step 11 is substituted in functional relation, its control voltage is obtained.Under
Obtain the demarcation relation between the control voltage to the depth information of scene and the imaging optical system in face
The process of taking is described in detail.
Specifically, as shown in Fig. 2 step 121 includes in the above embodiment of the present invention：
Step 1211, obtains the between the focal length and the control voltage of imaging optical system of imaging optical system
One demarcates relation；
Step 1212, obtains the second mark between the object distance and the focal length of imaging optical system of imaging optical system
Determine relation；
Step 1213, obtains the between the object distance and the depth information of scene of imaging object of imaging optical system
Three demarcate relation；
Step 1214, demarcates relation, the second demarcation relation and the 3rd demarcation relation according to described first and determines
Demarcation relation between the control voltage of the depth information of scene and the imaging optical system.
Specifically, the first demarcation relation between focal length f and control voltage (V1, V2) can be expressed as：
F=fun1 (V1, V2)；The second demarcation relation between object distance u and focal length f can be expressed as：U=fun2 (f)；
The 3rd demarcation relation between depth information of scene Depth and object distance u can be expressed as：Depth=fun3 (u)；
Then basis
F=fun1 (V1, V2)；
U=fun2 (f)；
Depth=fun3 (u)；
Can release, the demarcation relation between control voltage (V1, V2) and depth information of scene Depth,
(V1, V2)=fun4 (Depth) can be expressed as.
To sum up, the above embodiment of the present invention is finally capable of achieving to inquire imaging by depth information of scene Depth
The control voltage (V1, V2) of the focusing of optical system, so as to realize rapid focus.
Separately below the acquisition process of the first demarcation relation, the second demarcation relation and the 3rd demarcation relation is entered
Row is described in detail：
Specifically, the acquisition process of the first demarcation relation is as follows：
I.e. step 1211 includes：
Step 21, obtains the expression formula of the focal length of imaging optical system；
Step 22, according to root-mean-square value RMS, determines the minimum focus of imaging optical system and records minimum Jiao
Away from when the imaging optical system control voltage be minimum control voltage；
Step 23, on the basis of the minimum control voltage, control voltage described in consecutive variations simultaneously records each
Focal length under individual control voltage, so that it is determined that the focal length of imaging optical system is electric with the control of imaging optical system
The first demarcation relation between pressure.
Wherein, liquid crystal lens are provided with the above embodiment of the present invention in imaging optical system, then the first mark
Determine in the acquisition process of relation, coherent light will be interfered by liquid crystal lens, form interference fringe, and with being imaged
Interferogram sampling is recorded by optical system；And the software FringeXP provided using third party obtains whole filaments of sun
The position of stricture of vagina or bright fringess, then using software FringeXP obtain liquid crystal lens zernike coefficients (Ze Ni can
Coefficient), so as to obtain expression formula f=z of the focal length of liquid crystal lens3/r2, by be continually changing control voltage (V1,
V2), obtain comprehensive phase residual quantity RMS<During 0.07 λ, focal length is minimum, i.e., minimum focal length fmin, and record most
Control voltage (V1 during little focal lengthfmin, V2fmin).Then fix V1=V1fmin, consecutive variations V2=V2fmin+ Vstep, Vstep can choose 0.1V or 0.05V according to the requirement of precision.Record each voltage
(V1fmin, V2fmin+ K*Vstep) combination under focal length fK, wherein K ∈ [0, (V1fmin-V2fmin)
/ Vstep], so that it is determined that focal length fKControl voltage (the V1 of needsfmin, V2fmin+ K*Vstep), so as to
Determine the first demarcation relation f=fun1 (V1, V2).
Specifically, the acquisition process of the second demarcation relation is as follows：
I.e. step 1212 includes：
Step 24, based on Gauss imaging theory, obtains the object distance and imaging optical system of imaging optical system
The second demarcation relation between focal length.
It should be noted that must being fulfilled for Gauss imaging theory into sharply defined image：1/f=1/u+1/v, wherein, f
For the focal length of imaging optical system, u positions object distance, v is image distance.Due to saturating using liquid crystal in the embodiment of the present invention
Mirror, i.e., in liquid crystal imaging system, no any Mechanical Moving, therefore image distance v keeps constant；So focusing
Object distance u and focal length f correspond：U=vf/ (v-f).U=fun2 (f)=vf/ (v-f) is obtained.
Specifically, the acquisition process of the 3rd demarcation relation is as follows：
I.e. step 1213 includes：
Step 25, imaging object is positioned at different object distances；
Step 26, obtains the depth information of scene of the imaging object at each object distance respectively；
Step 27, sets up the mapping relations one by one of the object distance and the depth information of scene, described to reflect one by one
Relation is penetrated for the 3rd demarcation relation.
In the above embodiment of the present invention, the relation demarcated between object distance u and depth Depth：Object is put
It is placed in different object distance u' ∈ [uClosely, uFar], liquid crystal lens are respectively set to work at each object distance
The state of minimum focus and maximum focal length, and the image of both states is obtained respectively：I_Fu' and I_Bu', leads to
Cross DFD algorithms and obtain object distance u' depth information Depth', thus establish object distance u and reflect with depth Depth
Penetrate relation.
Preferably, to improve the speed demarcated, can [u near, u is remote] take 10 it is different apart from u', lead to
Cross DFD algorithms and obtain 10 corresponding depth informations, then with the method for linear interpolation, obtain intensive
The corresponding intensive Depth' of u', intensive u' set are designated as U, and intensive Depth' set is designated as D, set D
It is also the relation that maps one by one with set U.
In other words, object distance u represents the distance between camera and object unit m, u ∈ [0, umax], depth Depth
Represent the distance between camera and object relation, Depth ∈ [0,2BiteWidth], pixels of the BiteWidth for image
Digit.As its physical significance is the same, depth Depth can be done with u and map one by one, Depth=
(2BiteWidth/umax)*u。
To sum up, the inside in the embodiment of the present invention performs flow process and specifically includes：Obtained by depth information Depth
Object distance u, obtains focal length f=uv/ (u+v) by object distance u, then by focal length f obtain corresponding control voltage (V1,
V2), output voltage (V1, V2), then can be focused at once in the object that object distance is u；Under normal circumstances
Response time t of the focusing time for liquid crystal lens<500ms.
In order to preferably realize above-mentioned purpose, control is obtained to provided in an embodiment of the present invention with reference to Fig. 3
Voltage is as follows with the detailed process of the demarcation relation of depth information of scene：
Step 301, liquid crystal lens focal length f is with the relation of voltage (V1, V2) for measurement, i.e., measured
With the relation that the careless change in voltage of liquid crystal lens focal length is obtained after demarcation：F=fun1 (V1, V2).
Step 302, must is fulfilled for Gauss imaging theory into sharply defined image：1/f=1/u+1/v, f are image opticss
System focal, u positions object distance, v is image distance.In liquid crystal imaging system, no any Mechanical Moving, image distance
V keeps constant, so object distance u of focusing is corresponded with focal length f：U=fun2 (f)=vf/ (v-f).
Step 303, is adjusted the focal length f of liquid crystal lens to minima fmin, imaging device by imaging device
In the state fuzzy to most front scene focusing and background, image I_F is obtained in this case.
Liquid crystal lens focal length f is modulated maximum fmax by imaging device by step 304, and imaging device is in
And prospect fringe clear to background, obtains image I_B in this case.
Step 305, obtains depth information of scene using the method for DFD；I.e. according to image I_F and image I_B
To calculate depth information；Using multigroup narrow band filter (pass-band filter), or FRACTIONAL FILTER
(rational filter) etc. obtains the relative degree of defocusing of image I_F and image I_B.The relative degree of defocusing of object
It is into one-to-one relationship within the specific limits with scene depth, therefore can be calculated by this method
A range of scene depth.
Step 306, object distance u are more remote, and calculated depth value Depth is bigger for institute, and depth Depth
(Depth → u and u → Depth) is mapped one by one with object distance u：Depth=fun4 (u).
Step 307, has the mapping of depth Depth to obtain object distance u, is back-calculated to obtain focal length f by object distance u, by Jiao
Can inquire about away from f and obtain control voltage (V1, V2), you can obtain liquid crystal lens control voltage (V1, V2) and field
The demarcation relation of depth of field degree：(V1, V2)=fun5 (Depth).
To sum up, Atomatic focusing method provided in an embodiment of the present invention can be realized directly being inquired by depth information
The control voltage of focusing, so as to realize automatic rapid focus according to control voltage；Focusing efficiency is improve, together
Shi Wuxu mechanical movements, improve the service life of imaging optical system.
In order to preferably realize above-mentioned purpose, as shown in figure 4, the embodiment of the present invention also provides a kind of automatically right
Burnt device, for imaging optical system, including：
Acquisition module 41, for obtaining the depth information of scene of imaging object under current scene；
Determining module 42, for the control voltage according to the depth information of scene and the imaging optical system
Between demarcation relation, determine the control voltage of the imaging optical system；
Focusing module 43, for controlling the imaging optical system auto-focusing using the control voltage.
Specifically, acquisition module 41 described in the above embodiment of the present invention includes：
First acquisition submodule, under current scene, the first of imaging object when obtaining the first focusing state
Second defocusing degree of imaging object when defocusing degree and the second focusing state；
Second acquisition submodule, for determining institute according to first defocusing degree and second defocusing degree
State the depth information of scene of imaging object.
Specifically, determining module 42 described in the above embodiment of the present invention includes：
Acquisition module, for obtain the depth information of scene and the imaging optical system control voltage it
Between demarcation relation；
Determination sub-module, for according to the depth information of scene and the demarcation relation, determine it is described into
The control voltage of image optical system.
Specifically, acquisition module 41 described in the above embodiment of the present invention includes：
First acquisition submodule, for obtaining the control electricity of the focal length of imaging optical system and imaging optical system
The first demarcation relation between pressure；
Second acquisition submodule, for obtain the object distance of imaging optical system and imaging optical system focal length it
Between second demarcation relation；
3rd acquisition submodule, for obtaining the scene depth letter of the object distance of imaging optical system and imaging object
The 3rd demarcation relation between breath；
4th acquisition submodule, for demarcating relation, the second demarcation relation and the 3rd mark according to described first
Determine relation and determine the demarcation relation between the control voltage of the depth information of scene and the imaging optical system.
Specifically, described in the above embodiment of the present invention, the first acquisition submodule includes：
Acquiring unit, for obtaining the expression formula of the focal length of imaging optical system；
First recording unit, for according to root-mean-square value RMS, determining the minimum focus of imaging optical system simultaneously
During record minimum focus, the control voltage of the imaging optical system is minimum control voltage；
Second recording unit, on the basis of the minimum control voltage, control voltage described in consecutive variations
And the focal length under each control voltage is recorded, so that it is determined that the focal length of imaging optical system and image opticss system
The first demarcation relation between the control voltage of system.
Specifically, described in the above embodiment of the present invention, the second acquisition submodule includes：
Gauss demarcates unit, for based on Gauss imaging theory, obtaining object distance and the imaging of imaging optical system
The second demarcation relation between the focal length of optical system.
Specifically, described in the above embodiment of the present invention, the 3rd acquisition submodule includes：
Placement unit, for imaging object is positioned at different object distances；
Depth unit, for obtaining the depth information of scene of the imaging object at each object distance respectively；
Relation sets up unit, for setting up the mapping relations one by one of the object distance and the depth information of scene,
The mapping relations one by one are the described 3rd demarcation relation.
It should be noted that the above-mentioned auto-focusing of the application of the device of auto-focusing provided in an embodiment of the present invention
Method device, then all embodiments of the method for above-mentioned auto-focusing suitable for the auto-focusing dress
Put, and can reach same or analogous beneficial effect.
The above is the preferred embodiment of the present invention, it is noted that for the common skill of the art
For art personnel, on the premise of without departing from principle of the present invention, some improvements and modifications can also be made,
These improvements and modifications also should be regarded as protection scope of the present invention.
Claims (14)
1. a kind of method of auto-focusing, for imaging optical system, it is characterised in that include：
Obtain the depth information of scene of imaging object under current scene；
According to the demarcation relation between the control voltage of the depth information of scene and the imaging optical system,
Determine the control voltage of the imaging optical system；
The imaging optical system auto-focusing is controlled using the control voltage.
2. the method for auto-focusing according to claim 1, it is characterised in that obtain under current scene
The depth information of scene step of imaging object includes：
Under current scene, first defocusing degree and second pair of coke-like of imaging object when obtaining the first focusing state
Second defocusing degree of imaging object during state；
The scene depth of the imaging object is determined according to first defocusing degree and second defocusing degree
Information.
3. the method for auto-focusing according to claim 1, it is characterised in that described according to the field
Demarcation relation between the control voltage of scape depth information and the imaging optical system, determines the imaging
The step of control voltage of system, includes：
Obtain the demarcation relation between the control voltage of the depth information of scene and the imaging optical system；
According to the depth information of scene and the demarcation relation, the control of the imaging optical system is determined
Voltage.
4. the method for auto-focusing according to claim 3, it is characterised in that the acquisition field
The step of demarcation relation between the control voltage of scape depth information and the imaging optical system, includes：
Obtain the first demarcation relation between the focal length and the control voltage of imaging optical system of imaging optical system；
Obtain the second demarcation relation between the object distance and the focal length of imaging optical system of imaging optical system；
Obtain the 3rd demarcation relation between the object distance and the depth information of scene of imaging object of imaging optical system；
The scene depth is determined according to the first demarcation relation, the second demarcation relation and the 3rd demarcation relation
Demarcation relation between the control voltage of degree information and the imaging optical system.
5. the method for auto-focusing according to claim 4, it is characterised in that the acquisition imaging
The step of between the control voltage of the focal length and imaging optical system of system first demarcates relation includes：
Obtain the expression formula of the focal length of imaging optical system；
According to root-mean-square value RMS, described in when determining the minimum focus of imaging optical system and recording minimum focus
The control voltage of imaging optical system is minimum control voltage；
On the basis of the minimum control voltage, control voltage described in consecutive variations simultaneously records each control electricity
The focal length of pressure, so that it is determined that between the control voltage of the focal length and imaging optical system of imaging optical system
First demarcates relation.
6. the method for auto-focusing according to claim 4, it is characterised in that the acquisition imaging
The step of between the focal length of the object distance and imaging optical system of system second demarcates relation includes：
Based on Gauss imaging theory, obtain between the object distance and the focal length of imaging optical system of imaging optical system
Second demarcation relation.
7. the method for auto-focusing according to claim 4, it is characterised in that the acquisition imaging
The step of between the depth information of scene of the object distance and imaging object of system the 3rd demarcates relation includes：
Imaging object is positioned at different object distances；
The depth information of scene of the imaging object at each object distance is obtained respectively；
The mapping relations one by one of the object distance and the depth information of scene are set up, the mapping relations one by one are
Described 3rd demarcates relation.
8. a kind of device of auto-focusing, for imaging optical system, it is characterised in that include：
Acquisition module, for obtaining the depth information of scene of imaging object under current scene；
Determining module, for the control voltage according to the depth information of scene and the imaging optical system it
Between demarcation relation, determine the control voltage of the imaging optical system；
Focusing module, for controlling the imaging optical system auto-focusing using the control voltage.
9. the device of auto-focusing according to claim 8, it is characterised in that the acquisition module bag
Include：
First acquisition submodule, under current scene, the first of imaging object when obtaining the first focusing state
Second defocusing degree of imaging object when defocusing degree and the second focusing state；
Second acquisition submodule, for determining institute according to first defocusing degree and second defocusing degree
State the depth information of scene of imaging object.
10. the device of auto-focusing according to claim 8, it is characterised in that the determining module bag
Include：
Acquisition module, for obtain the depth information of scene and the imaging optical system control voltage it
Between demarcation relation；
Determination sub-module, for according to the depth information of scene and the demarcation relation, determine it is described into
The control voltage of image optical system.
The device of 11. auto-focusings according to claim 10, it is characterised in that the acquisition module
Including：
First acquisition submodule, for obtaining the control electricity of the focal length of imaging optical system and imaging optical system
The first demarcation relation between pressure；
Second acquisition submodule, for obtain the object distance of imaging optical system and imaging optical system focal length it
Between second demarcation relation；
3rd acquisition submodule, for obtaining the scene depth letter of the object distance of imaging optical system and imaging object
The 3rd demarcation relation between breath；
4th acquisition submodule, for demarcating relation, the second demarcation relation and the 3rd mark according to described first
Determine relation and determine the demarcation relation between the control voltage of the depth information of scene and the imaging optical system.
The device of 12. auto-focusings according to claim 10, it is characterised in that described first obtains
Submodule includes：
Acquiring unit, for obtaining the expression formula of the focal length of imaging optical system；
First recording unit, for according to root-mean-square value RMS, determining the minimum focus of imaging optical system simultaneously
During record minimum focus, the control voltage of the imaging optical system is minimum control voltage；
Second recording unit, on the basis of the minimum control voltage, control voltage described in consecutive variations
And the focal length under each control voltage is recorded, so that it is determined that the focal length of imaging optical system and image opticss system
The first demarcation relation between the control voltage of system.
The device of 13. auto-focusings according to claim 10, it is characterised in that described second obtains
Submodule includes：
Gauss demarcates unit, for based on Gauss imaging theory, obtaining object distance and the imaging of imaging optical system
The second demarcation relation between the focal length of optical system.
The device of 14. auto-focusings according to claim 10, it is characterised in that the described 3rd obtains
Submodule includes：
Placement unit, for imaging object is positioned at different object distances；
Depth unit, for obtaining the depth information of scene of the imaging object at each object distance respectively；
Relation sets up unit, for setting up the mapping relations one by one of the object distance and the depth information of scene,
The mapping relations one by one are the described 3rd demarcation relation.
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