CN108594400A - A kind of auto-focusing imaging method - Google Patents
A kind of auto-focusing imaging method Download PDFInfo
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- CN108594400A CN108594400A CN201810345125.6A CN201810345125A CN108594400A CN 108594400 A CN108594400 A CN 108594400A CN 201810345125 A CN201810345125 A CN 201810345125A CN 108594400 A CN108594400 A CN 108594400A
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Abstract
A kind of auto-focusing imaging method, including：The image sensed to image sensor carries out MTF operations；Current shooting object distance is determined according to operation result；If current shooting object distance is more than a preset standard value, image focus fuzzy revising that the image sensor is sensed；If current shooting object distance is less than or equal to the preset standard value, controls a marmen and the sampling image lens is driven to focus.The auto-focusing imaging modules can reach no matter whether object distance is more than the preset standard value, can access focusing clearly image.
Description
The application is application No. is 2012100435080, and the applying date is on February 24th, 2012, and invention and created name is
The divisional application of the patent of " auto-focusing imaging modules ".
Technical field
The present invention relates to a kind of imaging modules more particularly to a kind of auto-focusing imaging modules.
Background technology
Digital Autofocus Technology by software emulation, calculate at the image that is sensed image sensor
Reason so that because on image sensor pixel because image out of focus and fuzzy is apparent from.Extended depth-of-field (Extend Depth
of Field：EDoF) technology is common digital Autofocus Technology, utilizes the three primary colors (red, green, blue) of light
In different distance, each own best modular transfer function value (modulation transfer function, MTF) is bent
Line, therefore the best primary colors of object current distance can be utilized to go out other two primary colors using algorithm Digital Simulation, to reach full width
Full-color sharp image.However, the defect of digital focusing is to lead into low coverage since each MTF curve similarity is larger
As scarce capacity, in general, if object distance counts within preset standard value range (preset standard value is usually 40cm)
The focus effects of word Autofocus Technology tend not to satisfactory.
Invention content
In view of this, it is necessary to provide a kind of auto-focusing imaging modules avoiding the above problem.
A kind of auto-focusing imaging modules a comprising sampling image lens, a shadow optical coupled with the image capture lens
Color-separated processor, one and the color-separated processor being connected with the image sensor as sensor, one
The controller being connected and a marmen.Light images in the image after the sampling image lens
Sensor.The image that the color-separated processor is used to be sensed the image sensor uses red, green, blue three former respectively
Color table shows.The image that the controller is used to sense the image sensor carries out MTF operations, true according to operation result
Settled preceding subject is away from if current shooting object distance is more than a preset standard value, the controller is to the image sensor
The image sensed carries out fuzzy revising out of focus.If current shooting object distance is less than the preset standard value, the controller
Controlling the marmen drives the sampling image lens to focus.
For the prior art, whether the controller determines the object distance of subject first, and big according to the situation of object distance
It carries out focusing in such a way that image carries out fuzzy revising out of focus in preset standard value selection or be closed using shape memory
Golden driver is focused, and no matter whether object distance is more than the preset standard value, can access focusing clearly image.
Description of the drawings
Fig. 1 is the structural schematic diagram of the auto-focusing imaging modules of embodiment of the present invention.
Fig. 2 is the schematic diagram of the auto-focusing imaging modules of embodiment of the present invention.
Main element symbol description
Following specific implementation mode will be further illustrated the present invention in conjunction with above-mentioned attached drawing.
Specific implementation mode
It please refers to Fig.1 and Fig. 2, is the auto-focusing imaging modules 1 of embodiment of the present invention, including a sampling image lens
100,400, marmems of color-separated processor of image sensor 300, one of circuit board 200, one
(shape memory alloy, SMA) driver 500 and a controller 600.
The sampling image lens 100 have an optical axis OO and include 10, microscope bases 12 of a lens barrel and at least one have
The aspherical eyeglass 14 of positive light coke.Light is projected to the sensing area of the image sensor 300 through the sampling image lens 100
Domain simultaneously forms image in image sensing region.
The lens barrel 10 is generally hollow cylindric comprising a cylindrical body portion 101, from the main part 101 1
Hold the preceding cap 102 extended to 101 central shaft of the main part and around the preceding cap 102 and to far from the preceding cap
102 directions stretch flange formability portion 103, the central shaft of the main part 101 are Chong Die with the optical axis OO.The flange part 103 is circle
Annular, outer diameter are more than the outer diameter of the main part 101.The flange part 103 opens up that there are two through the flange part 103 and flat
The guide hole 1031 of the row optical axis OO.Described two guide holes 1031 are symmetrically disposed on a diametric(al) of the flange part 103
On.The flange part 103 includes a side 1032 for being parallel to the optical axis OO.
The microscope base 12 be the hollow tubular of both ends open and open up there are one top host cavity 121 and one with it is described
Top host cavity 121 is connected to and the bottom host cavity 122 of coaxial arrangement.The top host cavity 121 is cylindrical and its internal diameter
More than the internal diameter of the bottom host cavity 122 and the outer diameter of the flange part 103, the top host cavity 121 includes one
It is parallel to the first inner wall 1211 of the optical axis OO.The bottom host cavity 122 includes one and is parallel to the of the optical axis OO
Two inner walls 1221.The annular of one vertical optical axis OO of first inner wall 1211 and 1221 junction of the second inner wall formation
End face 123.The flange part 103 is contained in the top host cavity 121 and the side 1032 and first inner wall
1211 intervals are opposite, and the end face 123 and the flange part 103 are spaced the opposite and described end face 123 and open up that there are two mounting holes
1231, described two mounting holes 1231 are symmetrically disposed in a diametric(al) of the end face 123, and each mounting hole 1231 is
Blind hole is simultaneously corresponding with a guide hole 1031.It is installed there are one guide rod 124 by thread fiting mode in each mounting hole 1231,
Each guide rod 124 is simultaneously through a corresponding guide hole 1031.The internal diameter of the bottom host cavity 122 corresponds to the main part
101 outer diameter, the main part 101 are contained in simultaneously in the top host cavity 121 and the bottom host cavity 122.It is described
Eyeglass 14 is contained in the lens barrel 10.
The circuit board 200 is installed on the bottom end of the microscope base 12, be used to be electrically connected the image sensor 300,
The color-separated processor 400 and the marmen 500 and the controller 600.
The image sensor 300 is contained in the bottom host cavity 122 and is connected to the circuit board 200.It is described
Image sensor 300 is optical coupled with the sampling image lens 100 and includes multiple pixel unit (not shown), the multiple pixel
Unit is distributed in effective sensing region of the image sensor 300 in array shape.Each pixel unit includes three primary colors
(red, green, blue) pixel.Preferably, the image sensor 300 includes at least 2048 × 1536 pixel units.This embodiment party
In formula, the image sensor 300 can be charge coupling device (charged-coupled device, CCD) sensor or
Person's complementary metal oxide semiconductor (complementary metal oxide semiconductor, CMOS) sensor.
The color-separated processor 400 is connected with the image sensor 300.In other embodiments, the color
Color separation processor 400 can also be integrated in the image sensor 300.The color-separated processor 400 is a tool
There are the integrated circuit (aplication specific integrated circuit, ASIC) of specific function, the color point
It is used to the image that the image sensor 300 is sensed being separated into the image indicated with three primary colors from processor 400.It is described
Marmen 500 is connected between the lens barrel 10 and the microscope base 12.The specific marmem
Driver 500 includes two sub- drive components 52.Every sub- drive component 52 includes a shape memory alloy wire 521, one
First the second connector 523 of connector 522, one and a hanging part 524.The shape memory alloy wire 521 is by shape
Memorial alloy is made, for example, it may be NiTi based alloy, acid bronze alloy etc..First connector 522 is metal material system
At being installed on the side 1032.Second connector 523 is also made of metal and is mounted on the end face 123
On.First connector, 522 and second connector 523 is via the circuit board electrical connection to the controller 600.It is described
Hanging part 524 is made of insulating materials, and substantially arc-shaped and its both ends are mounted on first inner wall 1211, the extension
Fitting 524 is along being parallel to the direction of the optical axis OO relative to first connector 522 further from the image sensor
300.In other embodiments, the hanging part 524 can also be a hook.First connector 522, second connects
Part 523 and hanging part 524 are generally aligned in the same plane.Described two sub- drive components 52 are symmetrically set to the lens barrel 10 always
On diameter direction.The shape memory alloy wire 521 passes through a corresponding hanging part 522 and both ends are respectively connected to the first connector
522 and second connector 523.Being articulated between the both ends of the shape memory alloy wire 521 on corresponding hanging part 524 makes institute
It states shape memory alloy wire 521 and is in tensioned state.In present embodiment, described two sub- drive components 52 and two guide rods
124 are located substantially at same plane.The lens barrel 10 is hung in the microscope base 12 by two sub- drive components 52 and can be in institute
It states in microscope base 12 and is slided along described two guide rods 124.Described two guide rods 124 are for preventing the lens barrel 10 in the microscope base
Run-off the straight or rotation in 12.
The controller 600 is connected with the color-separated processor 400 and the marmen 500.
The controller 600 includes modulation transfer function (modulation transfer function, a MTF) computing module
61,64, fuzzy revising amounts of fuzzy quantity computing module of object distance judgment module 63, one of object distance computing module 62, one
The drive volume computing module 67 of focusing position computing module 66, one of computing module 65, one and an image processing module 68.
The MTF computing modules 61 are connected with the color-separated processor 400, the object distance computing module 62 with it is described
MTF computing modules 61 are connected, and the object distance judgment module 63 is connected with the object distance computing module 62, the focusing position fortune
It calculates module 66 and the fuzzy quantity computing module 64 is connected with the object distance judgment module 63, the drive volume computing module
67 are connected with the focusing position computing module 66 and the marmen 500；The fuzzy revising amount fortune
Module 65 is calculated with fuzzy quantity computing module 64 and described image processing module 68 to be connected.
The image that the MTF computing modules 61 are used to sense each pixel unit on the image sensor 300
Region carries out MTF operations, obtains the mtf value of corresponding region.In present embodiment, the MTF computing modules 61 are to each pixel
The corresponding three-primary-color image of unit carries out mtf value operation respectively.
The object distance computing module 62 determines each pixel unit for the operation result according to the MTF computing modules
The object distance of the image sensed.
The object distance judgment module 63 determines current shooting for the operation result according to the object distance computing module 62
Object distance.Specifically, the operation result of the object distance computing module is made comprehensive operation by the object distance judgment module 63, and this is comprehensive
The result for closing operation is compared with a preset standard value, and current shooting object distance is determined according to comparison result.In present embodiment,
The comprehensive operation is to the progress of the object distance of obtained each the sensed image of pixel unit of the object distance computing module 62
Sampling, and obtain according to the data operation of sampling the object distance token state of the distance for characterizing current shooting main target object.This
In embodiment, the standard value is 40cm.
The fuzzy quantity computing module 64 determines each picture for the operation result according to the MTF computing modules 61
The plain obtained mtf value of unitary operation and difference of the counterpart away from internal standard mtf value, and each pixel is determined according to the difference
The fuzzy quantity for the image that unit is sensed.The each pixel unit of standard mtf value is sensed in counterpart away from interior
The most mtf value in clear image region, therefore, the mtf value for each pixel unit that 61 operation of MTF computing modules obtains with
Difference between corresponding standard mtf value can characterize the fuzzy quantity for the image that each pixel unit is sensed.This embodiment party
In formula, the fuzzy quantity computing module 64 carries out fuzzy quantity operation respectively to the three-primary-color image of each pixel unit.The mould
Paste amount computing module 64 according to subject determined by the object distance judgment module 63 away from and determine whether its function opens.
In present embodiment, when the object distance judgment module 63 judges that current shooting object distance is more than the preset standard value, the mould
64 function of paste amount computing module is opened, and 66 function of focusing position computing module is closed.
The fuzzy revising amount computing module 65 is used for according to 64 obtained fuzzy quantity of the fuzzy quantity computing module,
Determine that the image sensed to each pixel unit carries out the correction amount of fuzzy revising.In present embodiment, described obscure is repaiied
Positive quantity computing module 65 carries out trichromatic fuzzy revising amount operation respectively to the image of each pixel unit.
The focusing position computing module 66 is used for the operation result according to the object distance computing module 62, is taken described in determination
As the best focusing position of camera lens 100.The focusing position computing module 66 is according to determined by the object distance judgment module 63
Subject away from and determine whether its function opens.In present embodiment, when the object distance judgment module 63 judges currently to clap
When taking the photograph object distance less than or equal to the preset standard value, 66 function of focusing position computing module is opened, the focusing position
66 function of computing module is closed.
The drive volume computing module 67 is used for according to 62 obtained sampling image lens 100 of the object distance computing module most
Good focusing position determines the focusing drive volume of the sampling image lens 100.
Described image processing module 68 is used for according to the 65 obtained correction amount of fuzzy revising amount computing module, to every
The image that one pixel unit is sensed carries out fuzzy revising, to obtain clear image.In present embodiment, described image processing
Unit 48 carries out trichromatic amendment to the image of each pixel unit.
The marmen 500 is used to be driven according to 67 obtained focusing of the drive volume computing module
Momentum drives the sampling image lens 100 to best focusing position.The driving focusing amount is the marmen
When the 500 driving lens barrels 10 are moved to best focusing position, described two shape memory alloy wires 521 generate corresponding deformation institute
The driving current needed.
In use, the image that the color-separated processor 400 is sensed image sensor 300 carries out color point
From the image is expressed as Red Green Blue image；The MTF computing modules 61 are every to the image sensor 300
The image-region that one pixel unit is sensed carries out MTF operations, obtains the image-region pair that each pixel unit is sensed
The mtf value answered；Described in the mtf value for the image that the object distance computing module 62 is sensed according to each pixel unit determines
The object distance for the image that each pixel unit is sensed；The object distance judgment module 63 is sensed according to each pixel unit
The object distance of the image arrived determines current shooting object distance.
If current shooting object distance is more than the preset standard value, the fuzzy quantity computing module 64 is according to each picture
The corresponding mtf value of image-region that plain unit is sensed, determines the fuzzy quantity for the image that respective pixel unit is sensed；Institute
The fuzzy quantity for the image that fuzzy revising amount computing module 65 is sensed according to each image sensing unit is stated, determines and corresponds to
The fuzzy revising amount for the image that pixel unit is sensed；Described image processing module 68 is according to the fuzzy revising amount, to every
The image that one image sensing unit is sensed carries out fuzzy revising.
If current shooting object distance is less than or equal to the preset standard value, 66 foundation of focusing position computing module
The object distance for the image that each pixel unit is sensed, determines best focusing position；The focusing position computing module 66
The focusing drive volume of sampling image lens is determined according to the best focusing position；And it is closed to every shape memory according to focusing drive volume
Gold thread 521 provides corresponding driving current through the circuit board 200,522 and second connector 523 of corresponding first connector,
Every shape memory alloy wire 521 is heated by driving current, wherein is provided to two shape memory alloy wires 521
Driving current is equal, and two shape memory alloy wires 521 is so made to generate equal deflection.When each shape memory alloy wire
521 when being heated to martensite reverted austenite start temperature, and correspondingly-shaped memory alloy wire 521 is by Martensite phase transition to high temperature mother
Phase (i.e. austenite phase), volume contraction, to drive the lens barrel to be moved to close to 300 direction of the image sensor along optical axis OO
It is dynamic, it focuses, drives sampling image lens to best focusing position according to the focusing drive volume.When control driving circuit stopping carries
For the driving current, each shape memory alloy wire 521 is quickly cooled down, when temperature is less than the shape memory alloy wire 521
Martensite start temperature, the shape memory alloy wire 521 by high temperature parent phase is converted to low-temperature martensite phase and by receiving
Contracting replying state is to initial tight state.
The auto-focusing imaging modules determine the object distance of subject first with the controller, and according to object distance
Situation determines current shooting object distance, according to subject selection software calculation or the mode of sampling image lens is driven to carry out pair
Coke can reach no matter subject away from whether the preset standard value is more than, can access focusing clearly image.
In addition, those skilled in the art can also do other variations in spirit of that invention, certainly, these are smart according to the present invention
The variation that god is done all should include within scope of the present invention.
Claims (10)
1. a kind of auto-focusing imaging method comprising following steps：
The image sensed to image sensor carries out MTF operations；
Current shooting object distance is determined according to operation result；
If current shooting object distance is more than a preset standard value, the image focus sensed to the image sensor is fuzzy
It corrects；
If current shooting object distance is less than or equal to the preset standard value, controls a marmen and drive institute
Sampling image lens are stated to focus.
2. a kind of auto-focusing imaging method as described in claim 1, which is characterized in that
The image sensed to image sensor carries out MTF operations and specifically includes：
The image-region sensed to each pixel unit of the image sensor carries out MTF operations, obtains each pixel list
The corresponding mtf value of image-region that member is sensed.
3. a kind of auto-focusing imaging method as claimed in claim 2, which is characterized in that
It is described to determine that current shooting object distance specifically includes according to operation result：
The mtf value of the image sensed according to each pixel unit determines the figure that each pixel unit is sensed
The object distance of picture；
According to the object distance for the image that each pixel unit is sensed, current shooting object distance is determined.
4. a kind of auto-focusing imaging method as claimed in claim 3, which is characterized in that
If current shooting object distance is more than a preset standard value, the image focus that the image sensor is sensed
Fuzzy revising specifically includes：
If current shooting object distance is more than the preset standard value, the image-region pair that is sensed according to each pixel unit
The mtf value answered determines the fuzzy quantity for the image that respective pixel unit is sensed；
According to the fuzzy quantity for the image that each image sensing unit is sensed, determine what respective pixel unit was sensed
The fuzzy revising amount of image；
According to the fuzzy revising amount, the image sensed to each image sensing unit carries out fuzzy revising.
5. a kind of auto-focusing imaging method as claimed in claim 4, which is characterized in that further include：
When current shooting object distance is more than the preset standard value, the corresponding three-primary-color image of each pixel unit is carried out respectively
Mtf value operation；
According to three-primary-color image progress mtf value operation as a result, determining each obtained mtf value of pixel unit operation
With difference of the counterpart away from internal standard mtf value；
The fuzzy quantity for the image that each pixel unit is sensed is determined according to the difference.
6. a kind of auto-focusing imaging method as claimed in claim 5, which is characterized in that
If current shooting object distance is less than or equal to the preset standard value, one marmen band of the control
The dynamic sampling image lens carry out focusing and specifically include：
If current shooting object distance is less than or equal to the preset standard value, the figure sensed according to each pixel unit
The object distance of picture determines best focusing position；
The focusing drive volume of sampling image lens is determined according to the best focusing position.
7. a kind of auto-focusing imaging method as described in claim 1, which is characterized in that further include：
The marmen includes two sub- drive components, and every sub- drive component includes that a shape memory closes
Gold thread, first connector, second connector and a hanging part；
According to the focusing drive volume to every shape memory alloy wire through the circuit board, corresponding first connector and second
Connector provides corresponding driving current, and every shape memory alloy wire is heated by driving current.
8. a kind of auto-focusing imaging method as claimed in claim 7, which is characterized in that further include：
When each shape memory alloy wire is heated to martensite reverted austenite start temperature, correspondingly-shaped memory alloy wire is by geneva
Phase transformation is to high temperature parent phase (i.e. austenite phase), volume contraction, to drive the lens barrel along optical axis OO to close to the shadow
It as sensor orientation movement, focuses, drives the sampling image lens to best focusing position according to the focusing drive volume.
When control stops providing the driving current, each shape memory alloy wire is quickly cooled down, when temperature is less than the shape
The martensite start temperature of memory alloy wire, the shape memory alloy wire are converted to low-temperature martensite phase by high temperature parent phase
And initial tight state is returned back to by contraction state.
9. a kind of auto-focusing imaging method as claimed in claim 3, which is characterized in that further include：
The object distance of each sensed image of pixel unit is sampled, and is used for according to the data operation of sampling
Characterize the object distance token state of the distance of current shooting main target object.
10. a kind of auto-focusing imaging method as described in claim 1, it is characterised in that：The preset standard value is 40cm.
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| CN201810345125.6A CN108594400A (en) | 2012-02-24 | 2012-02-24 | A kind of auto-focusing imaging method |
| CN201210043508.0A CN103293823B (en) | 2012-02-24 | 2012-02-24 | Auto-focusing imaging modules |
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| CN101408658A (en) * | 2007-10-09 | 2009-04-15 | 一品光学工业股份有限公司 | Lens shifting mechanism with shape memory alloy |
| CN102262331A (en) * | 2010-05-25 | 2011-11-30 | 鸿富锦精密工业（深圳）有限公司 | Image acquisition module and image acquisition method thereof |
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| CN111025630A (en) * | 2019-12-17 | 2020-04-17 | 天津津航技术物理研究所 | Phase-change-based manufacturing method of athermal infrared optical lens barrel |
| CN114257710A (en) * | 2020-09-23 | 2022-03-29 | 北京小米移动软件有限公司 | Optical anti-shake structure and camera module and terminal equipment with same |
| CN114257710B (en) * | 2020-09-23 | 2024-02-20 | 北京小米移动软件有限公司 | Optical anti-shake structure and camera module and terminal equipment with same |
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| CN103293823A (en) | 2013-09-11 |
| CN103293823B (en) | 2018-04-20 |
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