CN109151328A - Lens focusing method, apparatus and zoom lens - Google Patents
Lens focusing method, apparatus and zoom lens Download PDFInfo
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- CN109151328A CN109151328A CN201811332966.XA CN201811332966A CN109151328A CN 109151328 A CN109151328 A CN 109151328A CN 201811332966 A CN201811332966 A CN 201811332966A CN 109151328 A CN109151328 A CN 109151328A
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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Abstract
The invention discloses a kind of lens focusing method, apparatus and zoom lens.Wherein, this method comprises: determining that the first driving voltage for driving camera lens to generate displacement drives the first clarity of lower imaging, and under the driving of the second driving voltage imaging the second clarity；Voltage adjustment direction and subsequent voltage adjusting step value are determined according to the first clarity and the second clarity, wherein voltage adjustment direction is to make the increased direction of clarity；Based on the second driving voltage, subsequent drive voltage is determined according to voltage adjustment direction and subsequent voltage adjusting step value, and determine the subsequent clarity of camera lens imaging under the driving of subsequent drive voltage；Determine that the corresponding driving voltage of clarity highest is the focusing voltage of camera lens from the first clarity, in the second clarity and subsequent clarity.The present invention solves focusing mode in the related technology, and time-consuming, inefficient technical problem.
Description
Technical field
The present invention relates to photographic device fields, in particular to a kind of lens focusing method, apparatus and zoom lens.
Background technique
Since fine optical zoom adjustment can not be carried out when the portable equipments such as mobile phone are taken pictures, it is often necessary to automatic to become
Coke assists user's shooting.It generally include stepping electricity in camera lens in autozoom technical solution applied by present
Machine or piezoelectric unit etc. can make part or all of camera lens generate displacement to change the component of focal length under driving voltage,
During autozoom, by driving voltage, from 0 to maximum value, voltage is gradually scanned at certain intervals, and records each
The clarity of driving voltage point wherein will will be used as focusing voltage by the highest driving voltage of clarity after the end of scan.
But such scanning data volume to be treated excessively leads to that time-consuming, and speed is slow.
For above-mentioned problem, currently no effective solution has been proposed.
Summary of the invention
The embodiment of the invention provides a kind of lens focusing method, apparatus and zoom lens, at least to solve the relevant technologies
In focusing mode, time-consuming, inefficient technical problem.
According to an aspect of an embodiment of the present invention, a kind of lens focusing method is provided, comprising: determine for driving
The first clarity that camera lens generates the lower imaging of the first driving voltage driving of displacement is stated, and under the driving of the second driving voltage
Second clarity of imaging；Voltage adjustment direction and subsequent voltage tune are determined according to first clarity and the second clarity
Synchronizing long value, wherein the voltage adjustment direction is to make the increased direction of clarity；Based on second driving voltage, according to
The voltage adjustment direction and the subsequent voltage adjusting step value determine subsequent drive voltage, and determine the camera lens in institute
State the subsequent clarity that subsequent drive voltage drives lower imaging；From first clarity, the second clarity and it is described after
Determine that the corresponding driving voltage of clarity highest is the focusing voltage of the camera lens in continuous clarity.
Optionally, determine that the subsequent voltage adjusting step value includes: according to first clarity and the second clarity
Determine the clarity difference of clarity difference and first driving between first clarity and second clarity
Voltage difference between voltage and second driving voltage；According to the clarity difference and the voltage difference, Yi Jiyu
The subsequent voltage adjusting step is worth corresponding attenuation coefficient, determines the subsequent voltage adjusting step value, wherein the decaying
Coefficient is less than 1.
Optionally, the attenuation coefficient is 0.75-0.95.
Optionally, it is based on second driving voltage, according to the voltage adjustment direction and subsequent voltage adjustment step
Long value determines subsequent drive voltage, and determine the camera lens under the subsequent drive voltage driving imaging it is subsequent clear
Degree include: using second driving voltage as adjustment center, determined in a manner of constantly reducing voltage adjusting step value it is multiple after
Continuous voltage adjusting step value；It is multiple subsequent on the voltage adjustment direction according to the multiple subsequent voltage adjusting step value
Driving voltage；In the case where the subsequent voltage adjusting step value is less than preset step-length threshold value, stop adjustment driving voltage,
And determine that the multiple subsequent drive voltage drives the subsequent clarity of lower imaging.
Optionally, it is based on second driving voltage, according to the voltage adjustment direction and subsequent voltage adjustment step
Long value determines subsequent drive voltage, and determine the camera lens under the subsequent drive voltage driving imaging it is subsequent clear
Degree includes: to determine first voltage adjusting step value using second driving voltage as adjustment center, according to the voltage adjustment side
To with the first voltage adjusting step value, determine third driving voltage, determine that the third driving voltage drives lower imaging
Clarity；Using the third driving voltage as adjustment center, second voltage adjusting step value is determined, adjusted according to the voltage
Direction and the second voltage adjusting step value, determine the 4th driving voltage, determine the 4th driving voltage drive lower at
The clarity of picture；N times are adjusted with this similar fashion, until n-th adjusts corresponding voltage adjusting step value and is less than preset step
Long threshold value.
Optionally, in the following manner, the clarity of camera lens imaging under driving voltage driving is determined:
Wherein, s is clarity, and M and N are respectively the length of imaging and the pixel quantity of wide direction, gI, jIt is to be sat in imaging
It is designated as the gray value of the pixel of (i, j), g0For the average value of all pixels gray value in imaging, coefficient a meets 0 < a < 1,
Factor beta meets 0 < β < 1.
Optionally, factor alpha and factor beta meet 0 < α < β < 1.
Optionally, first driving voltage is zero.
Optionally, the first voltage adjusting step value is less than preset step-length threshold value.
According to another aspect of an embodiment of the present invention, a kind of lens focusing device is additionally provided, comprising: first determines mould
Block, for determining the first clarity of the lower imaging of the first driving voltage driving for driving the camera lens to generate displacement, with
And the second driving voltage driving under imaging the second clarity；Second determining module, for according to first clarity
Voltage adjustment direction and subsequent voltage adjusting step value are determined with the second clarity, wherein the voltage adjustment direction is to make clearly
The clear increased direction of degree；Third determining module, for being based on second driving voltage, according to the voltage adjustment direction and institute
It states subsequent voltage adjusting step value and determines subsequent drive voltage, and determine the camera lens under subsequent drive voltage driving
The subsequent clarity of imaging；Focusing module is used for from first clarity, the second clarity and the subsequent clarity
The corresponding driving voltage of middle determining clarity highest is the focusing voltage of the camera lens.
According to another aspect of an embodiment of the present invention, a kind of zoom lens, including camera lens are additionally provided, for the mirror
The imaging device that head is imaged drives the camera lens to generate the driving device being displaced and zoom lens control device according to driving voltage,
Wherein, the zoom lens control device is used to carry out zoom according to the lens focusing method as described in any one of above-mentioned.
According to another aspect of an embodiment of the present invention, a kind of storage medium is additionally provided, the storage medium includes storage
Program, wherein described program operation when control the storage medium where equipment execute it is any one of above-mentioned described in
Lens focusing method.
According to another aspect of an embodiment of the present invention, a kind of processor is additionally provided, the processor is used to run program,
Wherein, described program run when execute it is any one of above-mentioned described in lens focusing method.
In embodiments of the present invention, using under the first driving voltage driving determined for driving the camera lens to generate displacement
First clarity of imaging, and the second driving voltage driving under imaging the second clarity；It is clear according to described first
Clear degree and the second clarity determine voltage adjustment direction and subsequent voltage adjusting step value, wherein the voltage adjustment direction is
Make the increased direction of clarity；Based on second driving voltage, according to the voltage adjustment direction and the subsequent voltage tune
Synchronizing long value determines subsequent drive voltage, and determine the camera lens under the subsequent drive voltage driving imaging it is subsequent
Clarity；The corresponding drive of clarity highest is determined from first clarity, in the second clarity and the subsequent clarity
Dynamic voltage is that the mode of the focusing voltage of the camera lens has reached quick searching by section where gradually reducing focus point
To the purpose of voltage, to realize the speed for improving and determining focusing voltage, the skill for determining the time used of focusing voltage is reduced
Art effect, and then solve focusing mode in the related technology, time-consuming, inefficient technical problem.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is a kind of flow chart of lens focusing method according to an embodiment of the present invention；
Fig. 2 is a kind of schematic diagram of filming apparatus of embodiment according to the present invention；
Fig. 3 is a kind of flow chart of focusing method of embodiment according to the present invention；
Fig. 4 is a kind of schematic diagram of lens focusing device according to an embodiment of the present invention.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The model that the present invention protects all should belong in member's every other embodiment obtained without making creative work
It encloses.
It should be noted that description and claims of this specification and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so as to the embodiment of the present invention described herein can in addition to illustrating herein or
Sequence other than those of description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that cover
Cover it is non-exclusive include, for example, the process, method, system, product or equipment for containing a series of steps or units are not necessarily limited to
Step or unit those of is clearly listed, but may include be not clearly listed or for these process, methods, product
Or other step or units that equipment is intrinsic.
According to embodiments of the present invention, a kind of embodiment of the method for lens focusing method is provided, it should be noted that attached
The step of process of figure illustrates can execute in a computer system such as a set of computer executable instructions, though also,
So logical order is shown in flow charts, but in some cases, it can be to be different from shown by sequence execution herein
Or the step of description.
Fig. 1 is a kind of flow chart of lens focusing method according to an embodiment of the present invention, as shown in Figure 1, this method includes
Following steps:
Step S102 determines that first of the lower imaging of the first driving voltage driving for driving camera lens to generate displacement is clear
Degree, and the second driving voltage driving under imaging the second clarity；
Step S104 determines voltage adjustment direction and subsequent voltage adjusting step according to the first clarity and the second clarity
Value, wherein voltage adjustment direction is to make the increased direction of clarity；
Step S106 is based on the second driving voltage, after being determined according to voltage adjustment direction and subsequent voltage adjusting step value
Continuous driving voltage, and determine the subsequent clarity of camera lens imaging under the driving of subsequent drive voltage；
Step S108 determines that clarity highest is corresponding from the first clarity, in the second clarity and subsequent clarity
Driving voltage is the focusing voltage of camera lens.
Through the above steps, the first clarity of lower imaging is driven using the first driving voltage, and in the second driving
Voltage drives the second clarity of lower imaging, determines voltage adjustment direction and subsequent according to the first clarity and the second clarity
Voltage adjusting step value is based on the second driving voltage, is determined according to voltage adjustment direction and subsequent voltage adjusting step value iteration
The mode of subsequent drive voltage has achieved the purpose that quick searching focusing voltage by section where gradually reducing focusing voltage,
The speed for determining focusing voltage is improved to realize, reduces the technical effect for determining the time used of focusing voltage, and then solve
The focusing mode determined in the related technology, time-consuming, inefficient technical problem.
Above-mentioned first driving voltage can be zero, that is to say that above-mentioned camera lens under the driving of the first driving voltage, does not occur
Displacement, eyeglass are in the dead-center position of camera lens, that is to say the position that eyeglass is not subjected to displacement；Above-mentioned first driving voltage can also be with
It is greater than zero lesser voltage, for example, being less than 1/10th or 1/20th of driving voltage maximum value, Huo Zhesan
1/10th etc..It can guarantee in this way, the second driving voltage drives the clarity of lower camera lens imaging to be higher than above-mentioned first and drives
The dynamic corresponding clarity of voltage, the second driving voltage focusing voltage more closer than the first driving voltage, it should be noted that this reality
Applying the focusing voltage in example can be driving voltage for focusing, between the second driving voltage and the first driving voltage
Voltage difference is voltage adjusting step.
On the basis of above-mentioned second driving voltage, according to above-mentioned voltage adjustment direction and it is less than above-mentioned voltage adjusting step
The step value of value determines subsequent driving voltage.It should be noted that during determining subsequent driving voltage, it is above-mentioned
Voltage adjustment direction is always that the direction high to clarity adjusts, it is therefore an objective to adjust driving voltage to focusing voltage approaches.But
The direction of voltage adjustment direction is indefinite, for example, the clarity of the first driving voltage is lower than the clarity of the second driving voltage,
In, the second driving voltage is higher than the first driving voltage, and voltage adjustment direction is to increase driving voltage.In the clear of the second driving voltage
Clear degree is higher than the clarity of third driving voltage, wherein third driving voltage is higher than the second driving voltage, and voltage adjustment direction is then
To reduce driving voltage.In addition, each subsequent voltage adjusting step value is small during subsequent determining driving voltage
In the subsequent voltage adjusting step value of last adjustment driving voltage, it is therefore intended that, it can gradually promote adjustment driving voltage
Precision, above-mentioned subsequent adjustment voltage step values are smaller, and the precision for adjusting driving voltage is higher, conversely, subsequent adjustment voltage step size
Value is bigger, and the precision for adjusting driving voltage is lower.
It is above-mentioned to be based on the second driving voltage, according to voltage adjustment direction and subsequent voltage adjusting step value, to driving voltage
It is adjusted, gradually to approach focusing voltage.It should be noted that the number of above-mentioned adjustment driving voltage, can be it is primary, two
It is secondary, or repeatedly, the driving voltage of adjustment can be infinitely close to above-mentioned focusing voltage.But in the actual process, can tolerate pair
The burnt time is limited, and the focusing precision of more demanding camera lens, therefore can not often allow to adjust repeatedly.In view of
This, can use aforesaid way described herein, predetermined whole meeting to terminate the process that driving voltage approaches focusing voltage
Only in the case where condition, assert that driving voltage when terminating is focusing voltage.
Above-mentioned termination condition can be above-mentioned subsequent voltage adjusting step value less than scheduled step-length threshold value, in above situation
Under, it can determine the voltage difference of the driving voltage and focusing voltage when termination, be less than above-mentioned step-length threshold value, that is to say above-mentioned driving
Voltage is in the corresponding accuracy rating of step-length threshold value of focusing voltage, the case where driving voltage meets certain accuracy rating
Under, assert above-mentioned driving voltage for focusing voltage.Above-mentioned termination condition can also be that the corresponding clarity of driving voltage meets one
In the case where fixed clarity threshold, adjustment driving voltage is terminated.Under above situation, illustrate that the clarity being adjusted has reached
To target sharpness, target is realized, therefore can choose termination adjustment driving voltage, by the corresponding drive of above-mentioned clarity
Dynamic voltage is as focusing voltage.Above-mentioned termination condition can also be other, the determination of final driving voltage can focused
Condition in certain accuracy rating of voltage.
It is above-mentioned to be based on the second driving voltage as a kind of optional embodiment, according to voltage adjustment direction and subsequent voltage
Adjusting step value determines subsequent drive voltage, and determines the subsequent clarity of camera lens imaging under the driving of subsequent drive voltage
It include: to determine multiple subsequent voltages in a manner of constantly reducing voltage adjusting step value using the second driving voltage as adjustment center
Adjusting step value；According to multiple subsequent drive voltages of multiple subsequent voltage adjusting step values on voltage adjustment direction；Rear
In the case that continuous voltage adjusting step value is less than preset step-length threshold value, stop adjustment driving voltage, and determine multiple subsequent drives
Dynamic voltage drives the subsequent clarity of lower imaging.
It is above-mentioned to be based on the second driving voltage as a kind of optional embodiment, according to voltage adjustment direction and subsequent voltage
Adjusting step value determines subsequent drive voltage, and determines the subsequent clarity of camera lens imaging under the driving of subsequent drive voltage
It include: to determine first voltage adjusting step value using the second driving voltage as adjustment center, according to voltage adjustment direction and the first electricity
Adjusting step value is pressed, determines third driving voltage, determines that third driving voltage drives the clarity of lower imaging；It is driven with third
Voltage is adjustment center, determines second voltage adjusting step value, according to voltage adjustment direction and second voltage adjusting step value, really
Fixed 4th driving voltage determines that the 4th driving voltage drives the clarity of lower imaging；N times are adjusted with this similar fashion, until
N-th adjusts corresponding voltage adjusting step value and is less than preset step-length threshold value.It is above-mentioned to approach focusing electricity in adjustment driving voltage
During pressure, it can be adjustment n times, until n-th adjusts corresponding voltage adjusting step value and is less than preset step-length threshold value.
Above-mentioned a variety of different adjustment modes, the specific adjustment mode of flexible choice can be used.
Optionally, determine that subsequent voltage adjusting step value comprises determining that first according to the first clarity and the second clarity
Between clarity and the second clarity the clarity difference of clarity difference and the first driving voltage and the second driving voltage it
Between voltage difference；According to clarity difference and voltage difference, and attenuation coefficient corresponding with subsequent voltage adjusting step value,
Determine subsequent voltage adjusting step value, wherein attenuation coefficient is less than 1.
Determining that subsequent voltage adjusting step value can be using various ways, example according to the first clarity and the second clarity
Such as, clarity difference between the first clarity and the second clarity and the first driving voltage and the second driving voltage are determined
Between voltage difference；According to clarity difference and voltage difference, the change rate that clarity changes with driving voltage is determined；According to
Change rate determines subsequent voltage adjusting step value.An attenuation coefficient can also be enclosed according to for subsequent voltage adjusting step value,
Above-mentioned attenuation coefficient determines the attenuation degree of subsequent voltage adjusting step value, above-mentioned attenuation coefficient and voltage difference or subsequent electricity
The product of adjusting step value is pressed, to determine subsequent voltage adjusting step value.Above-mentioned attenuation coefficient can be used actual
Cheng Zhong is determined according to actual adjustment demand.
Optionally, attenuation coefficient can be 0.75-0.95.
Above-mentioned attenuation coefficient is declined with the step value of form and subsequent voltage adjusting step value calculated for subsequent the adjustment voltage multiplied
Subtract that coefficient is bigger, the attenuation degree of subsequent voltage adjusting step value is smaller, and the step value of subsequent adjustment voltage is bigger, voltage adjustment
Precision is lower, determines that the adjustment driving voltage number of focusing voltage is more；Attenuation coefficient is smaller, subsequent voltage adjusting step value
Attenuation degree is bigger, and the attenuation degree of subsequent voltage adjusting step is bigger, and the step value of subsequent adjustment voltage is smaller, voltage adjustment
Precision is higher, calmly can be 0.75-0.95 by attenuation coefficient in the present embodiment therefore.
Optionally, in the following manner, the clarity of camera lens imaging under driving voltage driving is determined:
Wherein, s is clarity, and M and N are respectively the length of imaging and the pixel quantity of wide direction, gI, jIt is to be sat in imaging
It is designated as the gray value of the pixel of (i, j), g0For the average value of all pixels gray value in imaging, factor alpha meets 0 < α < 1,
Factor beta meets 0 < β < 1.
The clarity of camera lens imaging in the case where determining driving voltage driving, can in several ways, for example, being filled by imaging
It sets, determines the clarity of imaging, can be and the clear of imaging is determined by photosensitive sensor or clarity detection device
Degree.In the present embodiment, clarity is calculated using above-mentioned formula, the process of above-mentioned calculating can be by relevant processing
Device or controller execute, and calculate clarity to realize to automate, improve calculating speed and computational efficiency.
Optionally, factor alpha and factor beta meet 0 < α < β < 1.In above-mentioned formula, factor alpha and factor beta are adjustable,
Preferably 0 < α < β < 1.
Optionally, the first driving voltage is zero.One of above-mentioned first driving voltage and the second driving voltage all can be zero.
The case where turntable driving voltage since 0 can effectively be described, i.e., general initial conditions start adjustment driving in the case of this
Voltage approaches focusing voltage, the adjustment direction of voltage are uniquely, convenient for calculating, to reduce difficulty in computation.
Optionally, first voltage adjusting step value is less than preset step-length threshold value.Above-mentioned first voltage adjusting step value is small
In preset step-length threshold value, voltage adjusting step can be limited in a certain range, guarantee the precision of driving voltage adjustment, have
Effect limits the first driving voltage and the unsuitable difference of the second driving voltage is excessive, to determine that adjustment direction will not become opposite.
It should be noted that one kind as the present embodiment is optional the embodiment of the present application also provides a kind of filming apparatus
Embodiment, the embodiment is described in detail below.
Fig. 2 is a kind of schematic diagram of filming apparatus of embodiment according to the present invention, as shown in Fig. 2, filming apparatus 100,
Including camera lens 101, at least part of camera lens 101 can be driven by driving assembly 105 to generate the displacement along optical axis direction,
For example, the lantern ring of eyeglass and installation eyeglass, can be driven by driving assembly 105, be subjected to displacement along optical axis direction, and should
It is displaced directly proportional to the size of driving voltage.To have variable focal length, image-forming assembly 103 is for the photosensitive of lens imaging
Sensor or other light-sensitive elements, and component 107 of focusing is then the controller for controlling auto-focusing, which can
To include processor, control circuit, digital analog converter.
Fig. 3 is a kind of flow chart of lens focusing method of embodiment according to the present invention, as shown in figure 3, this method packet
Include following steps:
Step S301 obtains first articulation index and camera lens of the camera lens under the driving of the first driving voltage second
The second articulation index under driving voltage driving；
Step S303 determines third driving voltage according to the difference of the first articulation index and the second articulation index, obtains
Take third articulation index；
Step S305, centered on third driving voltage, by according to third articulation index and the second articulation index
Difference and change step-length adjustment driving voltage.
Firstly, driving camera lens in the first driving voltage and the second driving voltage, a clarity, driving voltage are respectively obtained
Size answered to the size of displacement it is directly proportional.First driving voltage can be 0, and the second driving voltage size is then equal to preset step
Long threshold value or another is random a small amount of.In actual use, the first driving voltage can be the driving electricity of last focusing
It presses and is not necessarily intended to return at 0 point.Carry out sharpness computation when, can the window area only to a M*N pixel be imaged, window
Size rotates on demand, does not need to analyze whole image.Clarity can determine in the following ways:
Wherein, s is clarity, and M and N are respectively the length and wide direction of the image-region sampled when obtaining articulation index
Pixel quantity, gi,jIt is the gray value for the pixel that coordinate is (i, j), g0For the average value of all pixels gray value in image-region,
0 < α < 1, and 0 < β < 1.
Can have difference between the clarity s1 of first driving voltage and the clarity s2 of the second driving voltage, if s1 <
S2, then driving voltage can be adjusted to the direction of the second driving voltage, that is, be increased, vice versa, that is, reduces.It is adjusted since 0 point
In the case where whole, then it can skip over this and more directly start to increase driving voltage.The difference of s1 and s2 is bigger, then when adjusting voltage
Mobile step-length is bigger, it will be appreciated that proportional for step-length and Δ s.It will be on the basis of the second driving voltage when adjusting voltage
Obtained step value is increased or decreased, and obtains third driving voltage.The third driving voltage will be as the first of focusing
Reference point increases or decreases the step value obtained each time centered on it, until approaching focus point.Reach third driving voltage
The step value adjusted next time afterwards is by the difference based on s2 and s3, and the step-length and Δ s are at same proportional relation, the proportional relation
Including but not limited to linear relationship.
Next, will similarly on the basis of third driving voltage find the 4th driving voltage, but difference be from
This starts gradually add an attenuation factor d to step-length, further decreased after each iteration to reach intense adjustment
It is required that such as step (i)=step (i-1) d, wherein d < 1, d can be kept fixed value, and such as the range of 0.95-0.75, d can also
To be gradually reduced according to the difference of articulation index before and after current iteration, to be also possible to a variable.
When step-length reaches preset voltage adjusting step value threshold value, electricity is driven including at least two endpoints at this time
The articulation index of multiple driving voltages of these values of pressure and midpoint driving voltage, and clearest one is selected to drive
Voltage is as final focusing voltage.When section is sufficiently small, necessity of iteration is not continued, at this time from multiple discrete points
Between carry out selection can meet demand.Finally apparently, focusing voltage may be quickly found out within iteration several times, to reduce
Time needed for focusing.
Fig. 4 is a kind of schematic diagram of lens focusing device according to an embodiment of the present invention, as shown in figure 4, according to the present invention
The another aspect of embodiment additionally provides a kind of lens focusing device, comprising: the first determining module 42, the second determining module 44,
Third determining module 46 and Focusing module 48, are below described in detail the device.
First determining module 42, for determining that the first driving voltage for driving camera lens to generate displacement drives lower imaging
The first clarity, and the second driving voltage driving under imaging the second clarity；Second determining module 44, and it is above-mentioned
First determining module 42 is connected, for determining voltage adjustment direction and subsequent voltage tune according to the first clarity and the second clarity
Synchronizing long value, wherein voltage adjustment direction is to make the increased direction of clarity；Third determining module 46 is determined with above-mentioned second
Module 44 is connected, and for being based on the second driving voltage, is determined according to voltage adjustment direction and subsequent voltage adjusting step value subsequent
Driving voltage, and determine the subsequent clarity of camera lens imaging under the driving of subsequent drive voltage；Focusing module 48, for from
Determine that the corresponding driving voltage of clarity highest is the focusing of camera lens in first clarity, the second clarity and subsequent clarity
Voltage.
By above-mentioned lens focusing device, determined using the first determining module 42 for driving the camera lens to generate displacement
First driving voltage drives the first clarity of lower imaging, and under the driving of the second driving voltage imaging it is second clear
Degree；Second determining module 44 determines that voltage adjustment direction and subsequent voltage adjust according to first clarity and the second clarity
Step value, wherein the voltage adjustment direction is to make the increased direction of clarity；Third determining module 46 is based on described second and drives
Dynamic voltage determines subsequent drive voltage according to the voltage adjustment direction and the subsequent voltage adjusting step value, and determines
The subsequent clarity of camera lens imaging under subsequent drive voltage driving；Third determining module 46 is clear from described first
Determine that the corresponding driving voltage of clarity highest is pair of the camera lens in clear degree, the second clarity and the subsequent clarity
The mode of burnt voltage has achieved the purpose that quick searching to voltage, to realize by section where gradually reducing focusing voltage
The speed for determining focusing voltage is improved, reduces the technical effect for determining time used of focusing voltage, and then solve correlation
Focusing mode in technology, time-consuming, inefficient technical problem.
Optionally, the second determining module 44 of above-mentioned lens focusing device includes: the first determination unit, for determining first
Between clarity and the second clarity the clarity difference of clarity difference and the first driving voltage and the second driving voltage it
Between voltage difference；Second determination unit, for according to clarity difference and voltage difference, and with subsequent voltage adjusting step
It is worth corresponding attenuation coefficient, determines subsequent voltage adjusting step value, wherein attenuation coefficient is less than 1.
Optionally, attenuation coefficient 0.75-0.95.
Optionally, the third determination unit 46 of above-mentioned lens focusing device includes: the first adjustment unit, for driving with second
Dynamic voltage is adjustment center, and multiple subsequent voltage adjusting step values are determined in a manner of constantly reducing voltage adjusting step value；The
Two adjustment units, for multiple subsequent drive voltages according to multiple subsequent voltage adjusting step values on voltage adjustment direction；
4th determination unit, for stopping adjustment driving in the case where subsequent voltage adjusting step value is less than preset step-length threshold value
Voltage, and determine that multiple subsequent drive voltages drive the subsequent clarity of lower imaging.
Optionally, the third determination unit 46 of above-mentioned lens focusing device includes: iteration unit, for the second driving electricity
Pressure is adjustment center, determines first voltage adjusting step value, according to voltage adjustment direction and first voltage adjusting step value, is determined
Third driving voltage determines that third driving voltage drives the clarity of lower imaging；Using third driving voltage as adjustment center, really
Determine second voltage adjusting step value, according to voltage adjustment direction and second voltage adjusting step value, determines the 4th driving voltage, really
Fixed 4th driving voltage drives the clarity of lower imaging；N times are adjusted with this similar fashion, until n-th adjusts corresponding electricity
Adjusting step value is pressed to be less than preset step-length threshold value.
Optionally, in the following manner, the clarity of camera lens imaging under driving voltage driving is determined:
Wherein, s is clarity, and M and N are respectively the length of imaging and the pixel quantity of wide direction, gI, jIt is to be sat in imaging
It is designated as the gray value of the pixel of (i, j), g0For the average value of all pixels gray value in imaging, factor alpha meets 0 < α < 1,
Factor beta meets 0 < β < 1.
Optionally, factor alpha and factor beta meet 0 < α < β < 1.
Optionally, the first driving voltage is zero.
Optionally, first voltage adjusting step value is less than preset step-length threshold value.
According to another aspect of an embodiment of the present invention, a kind of zoom lens, including camera lens are additionally provided, for camera lens into
The imaging device of row imaging drives camera lens to generate the driving device of displacement and as above-mentioned lens focusing fills according to driving voltage
It sets.Above-mentioned focusing mechanism may include above-mentioned any one lens focusing device.
According to another aspect of an embodiment of the present invention, a kind of storage medium is additionally provided, storage medium includes the journey of storage
Sequence, wherein equipment where control storage medium executes following steps in program operation:
Optionally, determine that the first driving voltage for driving camera lens to generate displacement drives the first clear of lower imaging
Degree, and the second driving voltage driving under imaging the second clarity；It is determined according to the first clarity and the second clarity
Voltage adjustment direction and subsequent voltage adjusting step value, wherein voltage adjustment direction is to make the increased direction of clarity；Based on
Two driving voltages determine subsequent drive voltage according to voltage adjustment direction and subsequent voltage adjusting step value, and determine camera lens
The subsequent clarity of imaging under the driving of subsequent drive voltage；From the first clarity, the second clarity and subsequent clarity
The corresponding driving voltage of middle determining clarity highest is the focusing voltage of camera lens.
Optionally, determine that subsequent voltage adjusting step value comprises determining that first according to the first clarity and the second clarity
Between clarity and the second clarity the clarity difference of clarity difference and the first driving voltage and the second driving voltage it
Between voltage difference；According to clarity difference and voltage difference, and attenuation coefficient corresponding with subsequent voltage adjusting step value,
Determine subsequent voltage adjusting step value, wherein attenuation coefficient is less than 1.
Optionally, attenuation coefficient 0.75-0.95.
Optionally, it is based on the second driving voltage, is determined according to voltage adjustment direction and subsequent voltage adjusting step value subsequent
Driving voltage, and determine that camera lens subsequent clarity of imaging under the driving of subsequent drive voltage includes: with the second driving electricity
Pressure is adjustment center, and multiple subsequent voltage adjusting step values are determined in a manner of constantly reducing voltage adjusting step value；According to more
Multiple subsequent drive voltages of a subsequent voltage adjusting step value on voltage adjustment direction；It is worth in subsequent voltage adjusting step small
In the case where preset step-length threshold value, stop adjustment driving voltage, and determines that multiple subsequent drive voltages drive lower imaging
Subsequent clarity.
Optionally, it is based on the second driving voltage, is determined according to voltage adjustment direction and subsequent voltage adjusting step value subsequent
Driving voltage, and determine that camera lens subsequent clarity of imaging under the driving of subsequent drive voltage includes: with the second driving electricity
Pressure is adjustment center, determines first voltage adjusting step value, according to voltage adjustment direction and first voltage adjusting step value, is determined
Third driving voltage determines that third driving voltage drives the clarity of lower imaging；Using third driving voltage as adjustment center, really
Determine second voltage adjusting step value, according to voltage adjustment direction and second voltage adjusting step value, determines the 4th driving voltage, really
Fixed 4th driving voltage drives the clarity of lower imaging；N times are adjusted with this similar fashion, until n-th adjusts corresponding electricity
Adjusting step value is pressed to be less than preset step-length threshold value.
Optionally, in the following manner, the clarity of camera lens imaging under driving voltage driving is determined:
Wherein, s is clarity, and M and N are respectively the length of imaging and the pixel quantity of wide direction, gI, jIt is to be sat in imaging
It is designated as the gray value of the pixel of (i, j), g0For the average value of all pixels gray value in imaging, factor alpha meets 0 < α < 1,
Factor beta meets 0 < β < 1.
Optionally, factor alpha and factor beta meet 0 < α < β < 1.
Optionally, the first driving voltage is zero.
Optionally, first voltage adjusting step value is less than preset step-length threshold value.
According to another aspect of an embodiment of the present invention, a kind of processor is additionally provided, processor is used to run program,
In, program executes following steps when running:
Optionally, determine that the first driving voltage for driving camera lens to generate displacement drives the first clear of lower imaging
Degree, and the second driving voltage driving under imaging the second clarity；It is determined according to the first clarity and the second clarity
Voltage adjustment direction and subsequent voltage adjusting step value, wherein voltage adjustment direction is to make the increased direction of clarity；Based on
Two driving voltages determine subsequent drive voltage according to voltage adjustment direction and subsequent voltage adjusting step value, and determine camera lens
The subsequent clarity of imaging under the driving of subsequent drive voltage；From the first clarity, the second clarity and subsequent clarity
The corresponding driving voltage of middle determining clarity highest is the focusing voltage of camera lens.
Optionally, determine that subsequent voltage adjusting step value comprises determining that first according to the first clarity and the second clarity
Between clarity and the second clarity the clarity difference of clarity difference and the first driving voltage and the second driving voltage it
Between voltage difference；According to clarity difference and voltage difference, and attenuation coefficient corresponding with subsequent voltage adjusting step value,
Determine subsequent voltage adjusting step value, wherein attenuation coefficient is less than 1.
Optionally, attenuation coefficient 0.75-0.95.
Optionally, it is based on the second driving voltage, is determined according to voltage adjustment direction and subsequent voltage adjusting step value subsequent
Driving voltage, and determine that camera lens subsequent clarity of imaging under the driving of subsequent drive voltage includes: with the second driving electricity
Pressure is adjustment center, and multiple subsequent voltage adjusting step values are determined in a manner of constantly reducing voltage adjusting step value；According to more
Multiple subsequent drive voltages of a subsequent voltage adjusting step value on voltage adjustment direction；It is worth in subsequent voltage adjusting step small
In the case where preset step-length threshold value, stop adjustment driving voltage, and determines that multiple subsequent drive voltages drive lower imaging
Subsequent clarity.
Optionally, it is based on the second driving voltage, is determined according to voltage adjustment direction and subsequent voltage adjusting step value subsequent
Driving voltage, and determine that camera lens subsequent clarity of imaging under the driving of subsequent drive voltage includes: with the second driving electricity
Pressure is adjustment center, determines first voltage adjusting step value, according to voltage adjustment direction and first voltage adjusting step value, is determined
Third driving voltage determines that third driving voltage drives the clarity of lower imaging；Using third driving voltage as adjustment center, really
Determine second voltage adjusting step value, according to voltage adjustment direction and second voltage adjusting step value, determines the 4th driving voltage, really
Fixed 4th driving voltage drives the clarity of lower imaging；N times are adjusted with this similar fashion, until n-th adjusts corresponding electricity
Adjusting step value is pressed to be less than preset step-length threshold value.
Optionally, in the following manner, the clarity of camera lens imaging under driving voltage driving is determined:
Wherein, s is clarity, and M and N are respectively the length of imaging and the pixel quantity of wide direction, gI, jIt is to be sat in imaging
It is designated as the gray value of the pixel of (i, j), g0For the average value of all pixels gray value in imaging, factor alpha meets 0 < α < 1,
Factor beta meets 0 < β < 1.
Optionally, factor alpha and factor beta meet 0 < α < β < 1.
Optionally, the first driving voltage is zero.
Optionally, first voltage adjusting step value is less than preset step-length threshold value.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
In the above embodiment of the invention, it all emphasizes particularly on different fields to the description of each embodiment, does not have in some embodiment
The part of detailed description, reference can be made to the related descriptions of other embodiments.
In several embodiments provided herein, it should be understood that disclosed technology contents can pass through others
Mode is realized.Wherein, the apparatus embodiments described above are merely exemplary, such as the division of the unit, Ke Yiwei
A kind of logical function partition, there may be another division manner in actual implementation, for example, multiple units or components can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Between coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or communication link of unit or module
It connects, can be electrical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
On unit.It can some or all of the units may be selected to achieve the purpose of the solution of this embodiment according to the actual needs.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can for personal computer, server or network equipment etc.) execute each embodiment the method for the present invention whole or
Part steps.And storage medium above-mentioned includes: that USB flash disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), mobile hard disk, magnetic or disk etc. be various to can store program code
Medium.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (13)
1. a kind of lens focusing method characterized by comprising
Determine the first clarity of the lower imaging of the first driving voltage driving for driving the camera lens to generate displacement, Yi Ji
Second driving voltage drives the second clarity of lower imaging；
Voltage adjustment direction and subsequent voltage adjusting step value are determined according to first clarity and the second clarity, wherein
The voltage adjustment direction is to make the increased direction of clarity；
Based on second driving voltage, determined according to the voltage adjustment direction and the subsequent voltage adjusting step value subsequent
Driving voltage, and determine the subsequent clarity of camera lens imaging under subsequent drive voltage driving；
The corresponding driving electricity of clarity highest is determined from first clarity, in the second clarity and the subsequent clarity
Pressure is the focusing voltage of the camera lens.
2. the method according to claim 1, wherein determining institute according to first clarity and the second clarity
Stating subsequent voltage adjusting step value includes:
Determine the clarity difference of clarity difference and described first between first clarity and second clarity
Voltage difference between driving voltage and second driving voltage；
According to the clarity difference and the voltage difference, and decaying corresponding with subsequent voltage adjusting step value system
Number, determines the subsequent voltage adjusting step value, wherein the attenuation coefficient is less than 1.
3. according to the method described in claim 2, it is characterized in that, the attenuation coefficient is 0.75-0.95.
4. the method according to claim 1, wherein second driving voltage is based on, according to the voltage tune
Perfect square determines subsequent drive voltage to the subsequent voltage adjusting step value, and determines the camera lens in the subsequent drive
The subsequent clarity of imaging includes: under voltage drives
Using second driving voltage as adjustment center, multiple subsequent electricity are determined in a manner of constantly reducing voltage adjusting step value
Press adjusting step value；
According to multiple subsequent drive voltages of the multiple subsequent voltage adjusting step value on the voltage adjustment direction；
In the case where the subsequent voltage adjusting step value is less than preset step-length threshold value, stop adjustment driving voltage, and really
Fixed the multiple subsequent drive voltage drives the subsequent clarity of lower imaging.
5. the method according to claim 1, wherein second driving voltage is based on, according to the voltage tune
Perfect square determines subsequent drive voltage to the subsequent voltage adjusting step value, and determines the camera lens in the subsequent drive
The subsequent clarity of imaging includes: under voltage drives
Using second driving voltage as adjustment center, first voltage adjusting step value is determined, according to the voltage adjustment direction
With the first voltage adjusting step value, third driving voltage is determined, determine that the third driving voltage drives lower imaging
Clarity；Using the third driving voltage as adjustment center, second voltage adjusting step value is determined, according to the voltage adjustment side
To with the second voltage adjusting step value, determine the 4th driving voltage, determine that the 4th driving voltage drives lower imaging
Clarity；N times are adjusted with this similar fashion, until n-th adjusts corresponding voltage adjusting step value and is less than preset step-length
Threshold value.
6. the method according to claim 1, wherein in the following manner, determining the camera lens in driving voltage
Drive the clarity of lower imaging:
Wherein, s is clarity, and M and N are respectively the length of imaging and the pixel quantity of wide direction, gI, jIt is that coordinate is in imaging
The gray value of the pixel of (i, j), g0For the average value of all pixels gray value in imaging, factor alpha meets 0 < α < 1, factor beta
Meet 0 < β < 1.
7. according to the method described in claim 6, it is characterized in that, factor alpha and factor beta meet 0 < α < β < 1.
8. according to claim 1 to method described in any one of 7, which is characterized in that first driving voltage is zero.
9. according to claim 1 to method described in any one of 7, which is characterized in that the first voltage adjusting step
Value is less than preset step-length threshold value.
10. a kind of lens focusing device characterized by comprising
First determining module, for determining that the first driving voltage for driving the camera lens to generate displacement drives lower imaging
First clarity, and the second driving voltage driving under imaging the second clarity；
Second determining module, for determining voltage adjustment direction and subsequent voltage according to first clarity and the second clarity
Adjusting step value, wherein the voltage adjustment direction is to make the increased direction of clarity；
Third determining module, for being based on second driving voltage, according to the voltage adjustment direction and the subsequent voltage
Adjusting step value determines subsequent drive voltage, and determines the camera lens under subsequent drive voltage driving after imaging
Continuous clarity；
Focusing module, for determining clarity most from first clarity, the second clarity and the subsequent clarity
High corresponding driving voltage is the focusing voltage of the camera lens.
11. a kind of zoom lens, which is characterized in that including camera lens, imaging device for the camera lens to be imaged, according to
Driving voltage drives the camera lens to generate the driving device being displaced and zoom lens control device, wherein the zoom lens control device is used for basis
The lens focusing method as described in any one of claim 1 to 9 carries out zoom.
12. a kind of computer storage medium, which is characterized in that the storage medium includes the program of storage, wherein in the journey
Lens focusing method described in any one of equipment perform claim requirement 1 to 9 where controlling the storage medium when sort run.
13. a kind of processor, which is characterized in that the processor is for running program, wherein right of execution when described program is run
Benefit require any one of 1 to 9 described in lens focusing method.
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| CN201811332966.XA CN109151328B (en) | 2018-11-09 | 2018-11-09 | Lens focusing method and device and zoom lens |
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