CN105376469B - A kind of driving auto focusing method for living things feature recognition mobile terminal - Google Patents
A kind of driving auto focusing method for living things feature recognition mobile terminal Download PDFInfo
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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
- H04N23/10—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths
- H04N23/11—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths for generating image signals from visible and infrared light wavelengths
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/18—Eye characteristics, e.g. of the iris
- G06V40/197—Matching; Classification
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
- G06F21/31—User authentication
- G06F21/32—User authentication using biometric data, e.g. fingerprints, iris scans or voiceprints
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/40—Spoof detection, e.g. liveness detection
- G06V40/45—Detection of the body part being alive
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- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/70—Multimodal biometrics, e.g. combining information from different biometric modalities
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Abstract
The present invention provides a kind of driving auto focusing methods for living things feature recognition mobile terminal, include the following steps：1) according to scheduled focusing task object distance range, local region of interest to be searched and search parameter are defined；2) according to local region of interest and search parameter to be searched defined in step 1), driving automatically focusing optical imaging lens are executed searches for control optical imaging lens in dull direction continuity from above focal position；3) control imaging sensor obtaining step 2) in the search output of dull direction continuity from above focal position imaging image pixel data；4) the focus quality of focal position search image I { Pi, i=1, NO } is calculated in real time, and assesses focus quality；5) judge the corresponding image of pinpointed focus quality for optimum focusing image.
Description
Technical field
The present invention relates to bio-identification photoelectric fields, especially a kind of for the mobile terminal visible light of high security and life
Object recognition combination photo electric imaging system and method.
Background technology
Mobile terminal includes smart phones, tablets, wearable devices etc., and present information technology mobile development trend is come
It sees, mobile terminal device is necessarily following to be applicable in widest equipment.
Currently, mobile terminal in practical application is logged in mobile security payment, account safety, is used in terms of Web bank
Extremely extensive, as the utilization of Yuebao, wechat, bank account management etc. is although during its use
Life brings great convenience, but a kind of novel economic criminal carried out the features such as weak by security of mobile terminal energy
Guilty gradual rise.
And in mobile terminal, the customary means that the prior art carries out identity validation is exactly Password Input, but this identity
The means security performance of confirmation is very low, it is only necessary to it is implanted into simple Virus on mobile terminals, it can be by the password
Leakage, causes to lose accordingly.In order to solve this problem, mobile terminal peace is carried out in the world or with the mode of bio-identification
Full authentication；Such as the fingerprint identification technology developed based on AuthenTec companies that Apple Inc. proposes, the Technology application is in hand
In machine terminal, the identity validation safety of mobile terminal is greatly improved；But during fingerprint technique identifies, due to
Fingerprint is static, although having uniqueness, is also extremely easy to be acquired finger print information, or even be imitated, so with
It is more and more extensive the utilization of fingerprint technique on mobile terminals, safety also can be corresponding on a declining curve, so pacifying
More advantageous bio-identification is to solve very effective method in mobile terminal safety authentication procedures in terms of full property,
And biological recognition system is that accuracy is highest in existing bio-identification.
At present in all mobile terminals in biological recognition system technology and product, be not carried out for Self-timer can
Light-exposed photo electric imaging system and the identification photo electric imaging system combination of iris vein biometric.But if the visible light photoelectricity of Self-timer
Imaging system and the identification photo electric imaging system combination of iris vein biometric separate independent realization, and cost greatly increases, mainly
The volume of mobile terminal the installation spaces for accommodating 3 sets or more separately Individual optical imaging systems can not be provided.
Additionally while iris vein in terms of forgery proofing safety bio-identification compared with fingerprint recognition more have it is excellent
Gesture, but if large-scale application is in important events such as such as mobile phone movement wholesale payments, it is still desirable to further upgrade anti-counterfeiting
The security technique of object In vivo detection, the threat to eliminate safe hidden trouble.After all bio-identification purpose itself be exactly for safety,
The safety of body is most basic and most important.
And how mobile terminal application in obtain high quality photoelectric imaging method of image and improve bio-identification at
The imaging method of power.
It may be noted that using the autonomous channels RGB-IR photo electric imaging system, visible light may be implemented and bio-identification is combined into
Picture, but at present its in view of production cost and technique, mutual wavelength background isolation or cut-off depth between autonomous channel also fail to
Meet actual demand.
Further, the mobile terminal visible ray and bio-identification combination photoelectric imaging system and method for high security need
It solves the problems, such as following serious：
1, visible ray and bio-identification combination photoelectric imaging system in mobile terminal application, meets the visible light of Self-timer
Photo electric imaging system and iris vein biometric identification photo electric imaging system combination, fixing fabric structure in 8.5mm*8.5mm*6mm,
Low-power consumption.
2, visible ray and bio-identification combination photoelectric imaging system in mobile terminal application, needs a whole set of high security
Forgery proofing biopsy method ensures the safety of bio-identification itself.
3. visible ray and bio-identification combination photoelectric imaging system in mobile terminal application needs the image for obtaining high quality
Photoelectronic imaging method.
4, visible ray and bio-identification combination photoelectric imaging system in mobile terminal application, needs a set of raising bio-identification
The imaging method of success rate.
5, visible ray and bio-identification combination photoelectric imaging system in mobile terminal application, needs greatly to reduce cost, at
Originally be reduced within 10 U.S. dollars to be applied on a large scale.
It is the ultimate challenge faced at present to solve problem above.
Invention content
The technical problem to be solved in the present invention provides a kind of mobile terminal visible light and bio-identification for high security
Combination photoelectric imaging system.
Special explanation, the bio-identification that the present invention narrates are appointed as iris and vein.
In order to solve the above technical problem, the present invention provides a kind of mobile terminal visible light and bio-identification combination photoelectric at
As system, including visible light photoelectronic imaging and bio-identification photo electric imaging system；The visible light photoelectronic imaging and bio-identification
Photoelectronic imaging is made of processor chips, LED illumination light source, optical filter, optical imaging lens, imaging sensor；Institute
The imaging array for stating imaging sensor is configured as the imaging wavelength that there is unit pixel the infrared light broadband of reception visible light-to be distributed
Spectrum；The LED illumination light source is configured as the radiating visible light-infrared imaging wavelength controlled by LED current driver
LED illumination light source, and the LED illumination light source has visible light-infrared light broadband imaging Wavelength distribution with imaging sensor
The radiated wavelength range being mutually matched；
It is variable that the optical filter is configured as the visible light-infrared light controlled by controller and driver of optical filter
Wavelength optical filter；The visible ray-infrared light variable wavelength optics wave filter is configured with can with imaging sensor
The wavelength-filtered range that light-exposed-infrared light broadband imaging Wavelength distribution is mutually matched；The optical imaging lens are configured as leading to
Cross the automatically focusing optical imaging lens of optical imaging lens focus driver control；The automatically focusing optical imaging lens quilt
It is configured to the focusing wave-length coverage being mutually matched with visible light-infrared light broadband imaging Wavelength distribution with imaging sensor；
The visible ray-infrared light variable wavelength optics wave filter, automatically focusing optical imaging lens, the optical centre of imaging sensor
It is configured as the coaxial optical path position of imaging system optic axis；The optical centre of the LED illumination light source is configured as being imaged
The off-axis light path position of system optics axis.
As to a kind of improvement of mobile terminal visible ray and bio-identification combination photoelectric imaging system of the present invention：
Pass through the LED illumination light source radiating visible light imaging wavelength, it is seen that light-infrared light variable wavelength optics filter was switched to
Filter infrared imaging wavelength, automatically focusing optical imaging lens physics Refractive focusing visual light imaging wavelength and imaging sensor
Imaging array receive visible wavelength constitute visible light photoelectronic imaging optical path；It is radiated by the LED illumination light source
Infrared imaging wavelength, it is seen that light-infrared light variable wavelength optics filter is switched to filtering visual light imaging wavelength, automatic poly-
The imaging array of burnt optical imaging lens physics Refractive focusing infrared imaging wavelength and imaging sensor receives infrared waves
The long optical path for constituting bio-identification photoelectronic imaging；The visible light photoelectronic imaging uses visual light imaging wavelength for 400-
650nm, focusing task object distance WD is at least in the range of 30-100cm；The bio-identification photoelectronic imaging uses infrared imaging
Wavelength is 750-950nm, and focusing task object distance WD is at least in the range of 30-100cm；The coaxial optical path position is visible
Light-infrared light variable wavelength optics filter, automatically focusing optical imaging lens, the optical centreline of imaging sensor and imaging
System optics between centers angle has 0 degree of angle；The off-axis light path position is radiation optical centerline and the imaging of lighting source
System optics between centers angle has 5-30 degree angles.
As to a kind of mobile terminal visible ray and bio-identification combination photoelectric imaging system of the present invention into one
Step is improved：The bio-identification photoelectronic imaging is with the requirement of following optical imagery：The imaging wavelength of bio-identification photoelectronic imaging
WI meets：750nm≤WI≤950nm；The focusing task object distance WD of bio-identification photoelectronic imaging meets：10cm≤WD≤30cm；
The pixel spatial resolution PSR of bio-identification photoelectronic imaging meets：PSR≥10pixel/mm；The light of bio-identification photoelectronic imaging
Enlargement ratio OM is learned to meet：OM=PS*PSR；Wherein, the PS is the physics ruler of each imaging pixel cell of imaging sensor
Degree；PSR is the pixel spatial resolution of bio-identification photoelectronic imaging；The optical space resolution ratio of the bio-identification photoelectronic imaging
OSRI meets in image space plane：When modulation transfer function is equal to 60%, 1/ (4*PS)≤OSRI≤1/ (2*PS)；It is described visible
Light photoelectronic imaging is with the requirement of following optical imagery：The imaging wavelength WI of visible light photoelectronic imaging meets：400nm≤WI≤
650nm；The focusing task object distance WD of visible light photoelectronic imaging meets：30cm≤WD≤100cm；The pixel of visible light photoelectronic imaging
Spatial resolution PSR should meet：PSR≤3pixel/mm；The optical magnification OM of visible light photoelectronic imaging, it should meet：
OM=PS*PSR；Wherein, PS described above is the physical size of each imaging pixel cell of imaging sensor；PSR is visible light
The pixel spatial resolution of photoelectronic imaging；
The optical space resolution ratio OSRI of the visible light photoelectronic imaging meets in image space plane：In modulation transfer function etc.
When 60%, 1/ (4*PS)≤OSRI≤1/ (2*PS).
Preferably, described image sensor, LED current driver, auto-focus optical imaging lens focusing driver with
And controller and driver of optical filter is controlled by processor chips；
The processor chips are configurable for connection imaging sensor, control imaging sensor imaging array output
Image pixel value data；Connect LED current driver drive control LED illumination light source radiation intensity, angle of radiation and position, spoke
Penetrate the time；It connects auto-focus optical imaging lens focusing driver and realizes that driving automatically focusing optical imaging lens physics is poly-
It is burnt；And connection controller and driver of optical filter realizes driving visible ray-infrared light variable wavelength optics wave filter wavelength model
Enclose change.
As to a kind of mobile terminal visible ray and bio-identification combination photoelectric imaging system of the present invention into one
Step is improved：The physics ruler of the imaging pixel cell of visible light-infrared light wavelength is received in the imaging array of described image sensor
Degree PS meets following condition：1um/pixel≤PS≤3um/pixel；The wavelength picture that described image sensor imaging array receives
Plain unit the numerical value Y with opto-electronic conversion, numerical value Y are：
Y=Q*GAIN*EXP*ADCG*E*PSU EQ1
Wherein：The EXP is the time of integration or time for exposure of imaging sensor imaging array；EXP, which is synchronized, is equal to LED photographs
Mingguang City's source radiation time；EXP≤33.3ms；GAIN is the number and analog gain of imaging sensor imaging array；Maximum value
GAIN meets the Signal to Noise Ratio (SNR) of imaging sensor, SNR >=36db decibels；ADCG is the ADC voltages of imaging sensor imaging array
Simulation-numerical value conversion quantization resolution；E is the radiance or radiant illumination that imaging sensor imaging array receives；
E=C* β * I/WD2*cos2ψ*(1/FNO)2
Wherein：I is 106 radiation intensity of LED illumination light source；The minimum value of I meets I >=100mw/sr；ψ is LED illumination light
Off-axis angle between the angle of radiation in source, the i.e. radiation optical centerline of LED illumination light source and imaging system optical axis；ψ meets：5
Degree≤ψ≤30 degree；WD is the focusing task object distance of optical imaging system；FNO is the numerical value light of automatically focusing optical imaging lens
Circle, i.e. pitch-row are reciprocal；FNO meets：0.5*PS/(1.22*λ)≤FNO≤2.0*PS/(1.22*λ)；
λ is imaging wavelength；β is the biological organism optical effect reflectivity of imaging object；C is the optics of optical imaging system
Coefficient；
C=1/16*cos4ω/(1+OM)2；
Wherein：ω is the field angle of object of incident light；ω meets：0≤ω≤FOV/2, FOV are the complete of photo electric imaging system
Field angle；OM is the optical magnification of photo electric imaging system；PSU is the imaging pixel cell of imaging sensor imaging array
Physical size square measure ratio；
PSU=(PS*PS)/cm2；
Q is photo electric imaging system opto-electronic conversion constant；Described image sensor imaging array receives pixel unit photoelectricity and turns
The digital value Y changed is exported as the original RAW pixel datas I { Y } of image；The imaging array of described image sensor by with
It is set to global frame imaging pattern or rolls row imaging pattern；Described image sensor is configured as RAW rgb pixel output formats,
Use RGB channel compensating gain or RGB channel balancing gain；
Using G channel compensations or balancing gain as standardizing standard, G_GC=1.0；R channel compensations or balancing gain R_GC=
G/R；Channel B compensates or balancing gain B_GC=G/B；[λ l, the λ h] is imaging wavelength range；The g (λ), r (λ), b (λ)
Respectively the photoelectric quantum transfer efficiency susceptibility Wavelength distribution function of the rgb light spectrum of imaging sensor, f (λ) are that visible light-is red
The transmissivity Wavelength distribution function of outer smooth variable wavelength optics filter, S (λ) are the radiance Wavelength distribution of LED illumination light source
Function；L (λ) is the transmissivity Wavelength distribution function of automatically focusing optical imaging lens；The equivalence is used to be increased with R channel compensations
Benefit or channel B compensating gain are normalizing standard；The image resolution ratio ROI of described image sensor is configured as：ROI≥
2560pixels*1280pixels；Described image sensor has chief ray incidence angles CRA (Chief Ray Angle) >=25
Degree.
As to a kind of mobile terminal visible ray and bio-identification combination photoelectric imaging system of the present invention into one
Step is improved：The LED illumination light source has：The visible light and infrared imaging wavelength of independence or mixed radiation；Half peak value radiates
Field angle Ω；The half peak value radiation angle of visual field Ω meets：
Ω≥FOV；
The FOV is the full filed angle of imaging system；
FOV≥2*arctan((DI*PS)/(2*EFL))；
Wherein：EFL is the equivalent focal length of automatically focusing optical imaging lens；DI is the image planes of imaging sensor imaging array
The quantity of diagonal pixels unit；PS is the physical size of the pixel unit of imaging sensor imaging array；For optimizing photoelectricity
The imaging viewing field of imaging system and the different angle of radiation of the one or more of image quality effect and position；For combined optimization light
The continuous or pulsed irradiation sessions and radiation intensity synchronous with imaging sensor imaging of the image quality effect of electric imaging system；
The LED illumination light source is encapsulated using SMD surface patch.
As to a kind of mobile terminal visible ray and bio-identification combination photoelectric imaging system of the present invention into one
Step is improved：The visible ray-infrared light variable wavelength optics wave filter has：When changing into visual light imaging wavelength：
Light cutoff rate Fi≤10.0% in visual light imaging wave-length coverage, it is seen that the light cut-off outside light imaging wavelength range
Rate Fo >=99.0%,
Or of equal value
Light transmission Ti >=90.0% in visual light imaging wave-length coverage, it is seen that the light transmission outside light imaging wavelength range
Rate To≤1.0%；
When changing into infrared imaging wavelength：
Light cutoff rate Fi≤10.0% in infrared imaging wave-length coverage, the light cut-off outside infrared imaging wave-length coverage
Rate Fo >=99.0%,
Or of equal value
Light transmission Ti >=90.0% in infrared imaging wave-length coverage, the light transmission outside infrared imaging wave-length coverage
Rate To≤1.0%.
As to a kind of mobile terminal visible ray and bio-identification combination photoelectric imaging system of the present invention into one
Step is improved：The automatically focusing optical imaging lens are configured as fixed focal length, saturating using liquid driven lens, liquid crystal drive
Appoint in mirror, VCM voice coil driven lens, MEMS driven lens, EDOF wave-front phase modulation lens or wafer scale array lenticule
Meaning is a kind of；
And it has：
Surface maximum reflectivity Rmax≤1.0%, surface average reflectance Ravg≤0.3%,
Or of equal value
Surface minimum transmittance Tmin >=99.0%, surface average transmittance Tavg >=99.7%；
The automatically focusing optical imaging lens have：Focal length EFL, numerical aperture FNO meet:
2mm≤EFL≤5mm, 1.4≤FNO≤2.8；
The optical distortion DOL absolute values of the automatically focusing optical imaging lens are configured as：DOL absolute value≤1%；
The opposite Coefficient of Utilitization IOR of the automatically focusing optical imaging lens is configured as：IOR >=50%；
The central vision brightness of peripheral field brightness/optical imaging lens of the IOR=optical imaging lens；
The automatically focusing optical imaging lens and imaging sensor are configured as being mutually matched chief ray incidence angles CRA.
A kind of imaging method for visible light photoelectronic imaging includes the following steps：1. processor chips are carried out to optics
FILTER TO CONTROL driver, LED current driver, imaging sensor, auto-focus optical imaging lens focusing driver are initial
Change working condition configuration；2. processor chips control controller and driver of optical filter, LED current driver, imaging sensor,
Auto-focus optical imaging lens focusing driver enters low-power consumption standby or shutdown mode；Processor chips judge whether to need
Visual light imaging image is obtained, is to go to step 4., no continuation step is 3.；4. processor chips are controlled by optical filter and are driven
It is visual light imaging wavelength that device, which changes visible ray-infrared light variable wavelength optics wave filter,；Processor chips control LED current and drive
Dynamic device drives LED illumination light source generation visual light imaging wavelength continuous or the radiation of lock-out pulse pattern；Processor chips control
The imaging array of imaging sensor receives global frame imaging pattern or rolls the original image RAW RGB pictures of row imaging pattern output
Prime number is according to I { Y }；5. processor chips according to imaging original image RAW pixel datas I { Y } and pixel unit opto-electronic conversion relationship,
Imaging sensor and LED current driver and auto-focus optical imaging lens focusing driver are driven, realizes feedback control；⑥
Processor chips are respectively to original image RAW pixel datas I { Y } interpolation reconstructions and image procossing；7. in processor chips output
Insert the image I { r, g, b } rebuild with after image procossing；8. 2. return to step recycles.
A kind of imaging method for bio-identification photoelectronic imaging, characterized in that include the following steps：1. processor chips
It carries out to controller and driver of optical filter, LED current driver, imaging sensor, automatically focusing optical imaging lens focus
Driver initial work state configures；2. processor chips control controller and driver of optical filter, LED current driver,
Imaging sensor, auto-focus optical imaging lens focusing driver enter low-power consumption standby or shutdown mode；3. processor core
Piece judges whether to need to obtain bio-imaging image, is to go to step (4), no continuation step is (3)；4. processor chips are filtered by optics
It is infrared imaging wavelength that wave device, which controls driver to change visible ray-infrared light variable wavelength optics wave filter,；5. processor core
Piece controls LED current driver and drives LED illumination light source generation infrared imaging wavelength continuous or the radiation of lock-out pulse pattern；
6. the imaging array that processor chips control imaging sensor receives global frame imaging pattern or rolls the output of row imaging pattern
Original image RAW RGB pixel datas I { Y }；7. processor chips are according to imaging original image RAW pixel datas I { Y } and pixel
Unit photoelectricity transformational relation drives imaging sensor and LED current driver and automatically focusing optical imaging lens to focus driving
Device realizes feedback control；8. processor chips export image I { Y }；9. (2) return to step recycles.
As the improvement to a kind of imaging method for bio-identification photoelectronic imaging of the present invention, described image sensing
Device initial work state is configured to RAW rgb pixel output formats, at RGB channel compensating gain or RGB channel balancing gain
Reason can configure the corresponding RGB channel number of setting imaging sensor by initial work state and/or analog gain simplifies
It realizes；The feedback control includes following step：First, the imaging that processor chips can be exported according to imaging sensor is former
Beginning image RAW pixel datas I { Y } and corresponding formula EQ1, the reset time of integration of feedback control imaging sensor, number and/
Or analog gain setting, feedback control LED current driver drive the radiation intensity and radiated time of LED illumination light source, are used for
Brightness of image is controlled, signal-to-noise ratio and motion blur degree improve image quality；Secondly, processor chips can be according to image sensing
The imaging original image RAW pixel datas I { Y } of device output calculates minute surface total reflection annoyance level and opposite brightness of illumination in image
Balance degree, feedback control LED current driver driving LED illumination light source is for controlling angle of radiation and position to improve imaging
Quality；Finally, processor chips can feed back control according to the focus mass value for calculating the original RAW pixel datas I { Y } of image
Auto-focus optical imaging lens focusing driver driving automatically focusing optical imaging lens processed realize bio-identification photoelectronic imaging
Focusing task object distance WD is at least in the range of 10cm-30cm.
A kind of driving auto focusing method, includes the following steps：1. according to scheduled focusing task object distance range, definition waits for
The local region of interest and search parameter of search；2. processor chips control auto-focus optical imaging lens focusing driver
According to local region of interest and search parameter to be searched defined in step 1, driving automatically focusing optical imaging lens execute
It is searched in dull direction continuity from above focal position；3. processor chips control in imaging sensor obtaining step 2 in dullness side
To the imaging original image RAW RGB pixel datas of continuity from above focal position search output；4. processor chips calculate in real time
The focus quality of image is searched in focal position；5. processor judges the corresponding image of pinpointed focus quality for optimum focusing image.
A kind of bio-identification forgery proofing biopsy method：It is produced using by visible light-infrared imaging wavelength radiation
Raw biological tissue's enhanced spectrometry-active characteristic real-time detection method.
As to a kind of improvement of bio-identification forgery proofing biopsy method of the present invention, the visible light-
Biological tissue's enhanced spectrometry-active characteristic real-time detection method that infrared imaging wavelength radiation generates, includes the following steps：1) place
Manage device chip by controller and driver of optical filter change visible ray-infrared light variable wavelength optics wave filter be visible light at
As wavelength；Processor chips drive control LED current driver drives LED illumination light source to generate visual light imaging wavelength radiation；
Processor chips obtain the visual light imaging wavelength image Ivs of imaging sensor imaging array；2) processor chips pass through optics
It is infrared imaging wavelength that FILTER TO CONTROL driver, which changes visible ray-infrared light variable wavelength optics wave filter,；Processor core
Piece drive control LED current driver drives LED illumination light source to generate infrared imaging wavelength radiation；Processor chips obtain figure
As the infrared imaging wavelength image Iir of sensor imaging array；3) processor chips calculate visual light imaging wave in step a, b
The contrast C data of long image Ivs and infrared imaging wavelength image Iir, respectively Ivs_C and Iir_C；Wherein：
Contrasts of the C between iris region and iris exterior domain；
Or
Contrasts of the C between venosomes and vein exterior domain；
C=S (Yiris)/S (Youtiris)；
Or
C=S (Youtvein)/S (Yvein)；
Yiris indicates iris region pixel；Youtiris indicates iris exterior domain pixel；Yvein indicates venosomes picture
Element；
Youtvein indicates vein exterior domain pixel；The function S is corresponding region pixels statistics valuation functions, described
Pixels statistics valuation functions use method include：Statistics with histogram, frequency statistics, average value statistics, weighted average Data-Statistics,
Median statistics, energy value statistics, variance statistic, gradient statistics or space-frequency domain filter；4) processor chips difference is real-time
Calculate picture contrast Ivs_C and Iir_C the activity change rate of visual light imaging wavelength radiation and infrared imaging wavelength radiation
Δρ；
Wherein：
Δ ρ=Iir_C/Ivs_C*100%；
5) according in visible light-infrared imaging wavelength radiation biological tissue enhanced spectrometry-active characteristic preset value and step 4
The active contrast respective change rate of data value Δ ρ, Rule of judgment Δ ρ > 300% realize detection biological living state in real time；Institute
The above-mentioned steps 1 and 2 sequences stated have equivalence, can exchange.
A kind of imaging method improving bio-identification success rate：Include the following steps：I, register when acquisition at least two or
Infrared imaging wavelength biometric image Iir { the P ψ that above LED illumination light source is generated in different angle of radiation and position
enroll}；II, the biometric templates of acquisition at least two or more are calculated using biometric image Iir { P ψ enroll }
Template { P ψ enroll }, carry out feature templates between intersect compare successfully after, save as the biometric templates of registration；Ⅲ,
The infrared imaging wavelength life that the LED illumination light source of one or more is generated in different angle of radiation and position is acquired when identification
Object image Iir { P ψ recogn }；IV, the feature templates generated are calculated using one or more biometric image Iir { P ψ recogn }
It carries out intersecting comparison and obtain between Template { P ψ recogn } and the biometric templates Template { P ψ enroll } of registration
Recognition result.
A kind of imaging method improving bio-identification success rate, it is characterized in that：Include the following steps：I, registration when acquire to
The infrared imaging wavelength biometric image Iir that few two kinds or more of LED illumination light source is generated in different radiation intensity
{Renroll}；II, the biometric templates that acquisition at least two or more is calculated using biometric image Iir { Renroll }
Template { Renroll }, carry out feature templates between intersect compare successfully after, save as the biometric templates of registration；III, knowledge
The infrared imaging wavelength biometric image that the LED illumination light source of one or more is generated in different radiation intensity is acquired when other
Iir{Rrecogn}；IV calculates the feature templates Template generated using one or more biometric image Iir { Rrecogn }
It carries out intersecting comparison between { Rrecogn } and the biometric templates Template { Renroll } of registration and obtains recognition result.
A kind of imaging method improving bio-identification success rate：Include the following steps：A register when acquisition at least two or with
On the infrared imaging wavelength biometric image Iir { Wenroll } that is generated in different radiated wavelength ranges of LED illumination light source；b
The biometric templates Template of acquisition at least two or more is calculated using biometric image Iir { Wenroll }
{ Wenroll }, carry out feature templates between intersect compare successfully after, save as the biometric templates of registration；C acquires one when identifying
The infrared imaging wavelength biometric image Iir that a or more LED illumination light source is generated in different radiated wavelength ranges
{Wrecogn}；D calculates the feature templates Template generated using one or more biometric image Iir { Wrecogn }
It carries out intersecting comparison between { Wrecogn } and the biometric templates Template { Wenroll } of registration and obtains recognition result.
Foregoing description is summarized, realizes the mobile terminal visible light and bio-identification group closing light of high security through the invention
Electric imaging system and its method：
1, visible ray and bio-identification combination photoelectric imaging system in mobile terminal application, realize meet Self-timer can
Light-exposed photoelectronic imaging and a variety of iris vein biometrics identification photoelectronic imaging combination, fixing fabric structure in 8.5mm*8.5mm*6mm,
Low-power consumption.
2, visible ray and bio-identification combination photoelectric imaging system in mobile terminal application, realizes a whole set of high security
Forgery proofing biopsy method ensures the safety of bio-identification itself.
3. visible ray and bio-identification combination photoelectric imaging system in mobile terminal application, realizes the image for obtaining high quality
Photoelectronic imaging method.
4, visible ray and bio-identification combination photoelectric imaging system in mobile terminal application, realizes a set of raising bio-identification
The imaging method of success rate.
5, visible ray and bio-identification combination photoelectric imaging system in mobile terminal application, realization greatly reduce cost, at
Originally 10 U.S. dollars is reduced to be applied on a large scale with interior energy.
Description of the drawings
The specific implementation mode of the present invention is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 is the overall construction drawing of the visible ray and bio-identification combination photoelectric imaging system of the present invention；
Specific implementation mode
Embodiment 1 provides a kind of mobile terminal visible ray and bio-identification combination photoelectric imaging system and method.This method
Include the imaging method of visible light photoelectronic imaging, the imaging method of bio-identification photoelectronic imaging, biological forgery proofing live body inspection
Survey method, the imaging method for improving bio-identification success rate.
As shown in Figure 1, the combination photoelectric imaging system set gradually from top to bottom along imaging system optical axis 100 it is visible
Light-infrared light variable wavelength optics filter (101 or 104) (for filtering visible or infrared light imaging wavelength, is located at automatic
Before or after focusing optical imaging lens 102), automatically focusing optical imaging lens 102 (be used for physics Refractive focusing imaging wavelength),
Fixed mounting 103 (for automatically focusing optical imaging lens to be fixedly mounted), the image of automatically focusing optical imaging lens pass
Sensor 105 (exporting image for opto-electronic conversion), lighting source 106 (including visible light and infrared light-LED illumination light source,
For generating visual light imaging wavelength radiation to visible light photoelectronic imaging and for generating infrared light to bio-identification photoelectronic imaging
Imaging wavelength radiate) and imaging system be fixedly mounted substrate 107 (fixed for providing visible light and bio-identification photoelectronic imaging
Carrier is installed), imaging system is fixedly mounted substrate 107 and connects Mobile terminal main board 110 (for realizing mobile terminal function circuit
Carrier), integrated LED current driver 108 (is radiated for drive control LED illumination light source 106 on Mobile terminal main board 110
Intensity, angle of radiation and position and radiated time), auto-focus optical imaging lens focusing driver 111 is (for driving certainly
The dynamic optical imaging lens 102 that focus focus automatically), controller and driver of optical filter 112 is (for driving visible light-infrared light
Variable wavelength optics filter changes wave-length coverage) and processor chips 109 (it is used for drive control LED current driver 108,
Auto-focus optical imaging lens focusing driver 111, controller and driver of optical filter 112 and imaging sensor 105).
Visible ray and bio-identification combination photoelectric imaging system includes being used for visible light photoelectricity in the specific embodiment of the invention 1
The optical path of the optical path and bio-identification photoelectronic imaging of imaging.
The optical path of visible light photoelectronic imaging includes as follows：
106 radiating visible light imaging wavelength of LED illumination light source, it is seen that light-infrared light variable wavelength optics filter (101
Or 104) it is switched to filtering infrared light imaging wavelength, 102 physics Refractive focusing visual light imaging of automatically focusing optical imaging lens
The imaging array of wavelength, imaging sensor 105 receives visible wavelength.
The optical path of bio-identification photoelectronic imaging includes as follows：
106 irradiating infrared light imaging wavelength of LED illumination light source, it is seen that light-infrared light variable wavelength optics filter (101
Or 104) it is switched to filtering visual light imaging wavelength, 102 physics Refractive focusing infrared imaging of automatically focusing optical imaging lens
The imaging array of wavelength, imaging sensor 105 receives infrared light wavelength.
In specific embodiments of the present invention 1, the imaging array of imaging sensor 105, which is configured as unit pixel, has reception
The imaging wavelength spectrum of the infrared light broadband distribution of visible light-；LED illumination light source 106 (visible light and infrared light LED illumination light source)
It is configured with the radiation wavelength being mutually matched with the visible light of imaging sensor 105-infrared light broadband imaging Wavelength distribution
Range；Visible ray-infrared light variable wavelength optics wave filter (101 or 104) is configured with visible with imaging sensor 105
The wavelength-filtered range that light-infrared light broadband imaging Wavelength distribution is mutually matched；Automatically focusing optical imaging lens 102 are configured
For the focusing wave-length coverage being mutually matched with the visible light with imaging sensor 105-infrared light broadband imaging Wavelength distribution.
Visible ray-infrared light variable wavelength optics wave filter (101 or 104), automatically focusing optical imaging lens 102, figure
As the optical centre of sensor 105 is configured as coaxial (on-axis) the light path position of imaging system optic axis 100.Coaxially
(on-axis) light path position is visible ray-infrared light variable wavelength optics wave filter (101 or 104), focuses optical imagery automatically
Angle has 0 degree of angle between lens 102 and the optical centreline and imaging system optic axis 100 of imaging sensor 105.
The optical centre of LED illumination light source 106 is configured as off-axis (off-axis) light path of imaging system optic axis 100
Position.(off-axis) light path position is between the radiation optical centerline and imaging system optic axis 100 of lighting source 106 off axis
Angle has 5-30 degree angles.
[processor chips 109 have the function of as follows：
For connecting imaging sensor 105, the image pixel value data of control 105 imaging array of imaging sensor output；
Radiation intensity, angle of radiation and the position of connection 108 drive control LED illumination light source 106 of LED current driver,
Radiated time；
It connects auto-focus optical imaging lens focusing driver 111 and realizes driving automatically focusing optical imaging lens 102
Physics focuses；
It connects controller and driver of optical filter 112 and realizes driving visible ray-infrared light variable wavelength optics wave filter wave
Long range changes.
Automatically focusing optical imaging lens 102 are configured as fixed focal length, may be used such as liquid driven lens, liquid crystal drive
Dynamic lens, VCM voice coil driven lens, MEMS driven lens, EDOF wave-front phase modulation lens or wafer scale array lenticule
In any one.
Above-described visible ray-infrared light variable wavelength optics wave filter (101 or 104) controls driver 112, can be with
Travel displacement control is distinguished using independent (the visible light and infrared light) optical filter of such as VCM voice coils electromagnetic and mechanical power drive 2
System realizes that wave-length coverage changes.Specifically, realizing that electromagnetic force pushes bullet by applying different size of current value in voice coil cavity
2 separate filter difference (visible or infrared light) of piece mechanical transfer actuator travel displacement arrive imaging system optic axis 100
Coaxial optical path position is to realize that driving wave-length coverage changes.More further, above-described visible light-infrared light variable wavelength light
Filter (101 or 104) is learned, thin dielectric film tunable wavelength optical filter may be used.It is controlled by optical filter
Driver 112 applies different size of thin film dielectric value tuning and realizes that optical filter wavelength filter area changes.The present invention
The visible ray-infrared light variable wavelength optics wave filter is not limited to the example above, and other types should equally be understood.
The imaging wavelength of invention includes that visual light imaging wavelength is 400-650nm, and infrared imaging wavelength is 750-
950nm；Imaging wavelength in specific embodiment 1 includes that visual light imaging wavelength is 400-650nm, and infrared imaging wavelength is
810-880nm.As an example, infrared imaging wave-length coverage, substantially imaging wavelength range are band to the specific embodiment of the invention 1
Wide characteristic can also be equal and be interpreted as by imaging wavelength center (wavelength center) and half-peak band width (FWHM)
Description, if 810-880nm ranges can be expressed as, centre wavelength 850nm ± 30nm half-peak band widths.Further, as imaging
Wave-length coverage variation citing, can centered on narrowband wavelength 850nm ± 15nm half-peak band widths.The imaging wavelength range of the present invention
Variation is not limited to the example above, other ranges should equally be understood.
Visible light photoelectronic imaging uses visual light imaging wavelength, and focusing task object distance WD is at least in the range of 30-100cm
Interior, photo electric imaging system uses infrared imaging wavelength, and focusing task object distance WD is at least in the range of 10-30cm.
Bio-identification photoelectronic imaging is with the requirement of following optical imagery：
The imaging wavelength WI of bio-identification photoelectronic imaging meets：750nm≤WI≤950nm；
The focusing task object distance WD of bio-identification photoelectronic imaging meets：10cm≤WD≤30cm；
The pixel spatial resolution PSR (pixel spatial resolution) of bio-identification photoelectronic imaging should expire
Foot：PSR≥10pixel/mm；
The optical magnification OM (opticalmagnification) of bio-identification photoelectronic imaging, it should meet：OM=
PS*PSR；
Wherein, above-described PS is the physical size of 105 each imaging pixel cell of imaging sensor；PSR is biology
Identify the pixel spatial resolution of photoelectronic imaging；
Optical space resolution ratio OSRI (the optical spatial resolution of of bio-identification photoelectronic imaging
Image of plane) it should meet in image space plane：When modulation transfer function is equal to 60% (MTF=0.6), 1/ (4*PS)
≤ OSRI≤1/ (2*PS) lp/mm (line is to every millimeter).
Visible light photoelectronic imaging is with the requirement of following optical imagery：
The imaging wavelength WI of visible light photoelectronic imaging meets：400nm≤WI≤650nm；
The focusing task object distance WD of visible light photoelectronic imaging meets：30cm≤WD≤100cm；
The pixel spatial resolution PSR (pixel spatial resolution) of visible light photoelectronic imaging should meet：
PSR≤3pixel/mm；
The optical magnification OM (optical magnification) of visible light photoelectronic imaging, it should meet：OM=
PS*PSR；
Wherein, above-described PS is the physical size of 105 each imaging pixel cell of imaging sensor；PSR is visible
The pixel spatial resolution of light photoelectronic imaging；
Optical space resolution ratio OSRI (the optical spatial resolution of of visible light photoelectronic imaging
Image of plane) it should meet in image space plane：When modulation transfer function is equal to 60% (MTF=0.6), 1/ (4*PS)
≤ OSRI≤1/ (2*PS) lp/mm (line is to every millimeter).
The physics ruler of the imaging pixel cell of visible light-infrared light wavelength is received in the imaging array of imaging sensor 105
Degree PS meets following condition：1um/pixel≤PS≤3um/pixel (micron is per pixel)；
The numerical value Y of wavelength pixel unit opto-electronic conversion that 105 imaging array of imaging sensor receives is：
Y=Q*GAIN*EXP*ADCG*E*PSU EQ1
Wherein：It is above-described
EXP is the time of integration integrationTime or time for exposure exposure of 105 imaging array of imaging sensor
Time, unit：S seconds；EXP, which is synchronized, is equal to 106 radiated time of LED illumination light source；
EXP≤33.3ms
GAIN is the number and analog gain of 105 imaging array of imaging sensor, no unit；
Maximum value GAIN meets the Signal to Noise Ratio (SNR) of imaging sensor 105, SNR >=36db decibels
ADCG is ADC voltage analogs-numerical value conversion quantization resolution of 105 imaging array of imaging sensor, unit：LSB/
V, every volt of value bit；
E is the radiance or radiant illumination that 105 imaging array of imaging sensor receives, unit：Lux (lux) or mw/
Cm 2 (every square centimeter per milliwatt)；
E=C* β * I/WD2*cos2ψ*(1/FNO)2
Wherein：I is 106 radiation intensity of LED illumination light source, and unit milliwatt is per surface of sphere (mw/sr)；
I minimum values meet I >=100mw/sr；
ψ is the angle of radiation of LED illumination light source 106, i.e., the radiation optical centerline of LED illumination light source 106 is with imaging
Off-axis angle between system optical axis 100；
ψ meets：5 degree≤ψ≤30 degree；More further it is limited to 7 degree≤ψ≤22.5 degree；
WD is the focusing task object distance of optical imaging system；
FNO is the numerical aperture of automatically focusing optical imaging lens 102, i.e. pitch-row is reciprocal；
FNO meets：0.5*PS/(1.22*λ)≤FNO≤2.0*PS/(1.22*λ)
λ is imaging wavelength；
β is the biological organism optical effect reflectivity (wavelength of LED illumination light source radiation of imaging object (iris or vein)
By the absorption of iris or vein biometric tissue, reflection and scattering generate biological organism optical effect reflectivity)；
C is the optical coefficient of optical imaging system；
C=1/16*cos4ω/(1+OM)2
Wherein：ω is the field angle of object of incident light；
ω meets：0≤ω≤FOV/2, FOV are the full filed angle of photo electric imaging system；
OM is the optical magnification of photo electric imaging system；
PSU is the physical size square measure ratio of the imaging pixel cell of 105 imaging array of imaging sensor；
PSU=(PS*PS)/cm2；
Q is photo electric imaging system opto-electronic conversion constant；Unit is that volt is every square centimeter per second per milliwatt, V/ (mw/cm2-
) or ke-/(mw/cm sec2-sec)；
105 imaging array of imaging sensor receives the digital value Y of pixel unit opto-electronic conversion further as image
As original RAW pixel datas I { Y } exports.
The imaging array of imaging sensor 105 is configured as global frame imaging pattern (Global Shutter) or rolls row
Imaging pattern (Rolling Shutter).
Global frame imaging pattern (Global Shutter) described in the specific embodiment of the invention 1 include global Frame integration and
The imaging pattern of global frame reading, or global Frame integration and the imaging pattern for rolling row reading.
Rolling row imaging pattern (Rolling Shutter) described in the specific embodiment of the invention 1 includes rolling row integral
With the imaging pattern for rolling row reading.
Imaging sensor 105 is configured as RAW rgb pixel output formats, uses RGB channel compensating gain or RGB channel
Balancing gain.
Using G channel compensations or balancing gain as standardizing standard, G_GC=1.0；
R channel compensations or balancing gain R_GC=G/R；
Channel B compensates or balancing gain B_GC=G/B；
Above-described [λ l, λ h] is imaging wavelength range, preferably illustrate in the specific embodiment of the invention 1 visible light at
Picture wavelength is [400nm, 650nm], and infrared imaging wavelength is that [800nm, 900nm] further can also as equivalent understanding
It is [810nm, 880nm] to select the variation of infrared imaging wave-length coverage.
G (λ), r (λ), b (λ) are respectively the photoelectric quantum transfer efficiency susceptibility wave of the rgb light spectrum of imaging sensor 105
Long distribution function, f (λ) are the transmissivity Wavelength distribution letter of visible ray-infrared light variable wavelength optics wave filter (101 or 104)
Number, S (λ) are the radiance Wavelength distribution function of LED illumination light source 106；L (λ) is the saturating of automatically focusing optical imaging lens 102
Penetrate rate Wavelength distribution function.
Equally understand, of equal value can also use using the gain of R channel compensations or channel B compensating gain as normalizing standard.
Special image imaging sensor 105 is using RGB channel gain compensation when monochrome type or RGB channel gain balance
It can be reduced to G_CGC=R_CGC=B_CGC=1.0；
The image resolution ratio ROI of the imaging sensor 105 is configured as：
ROI≥2560pixels*1280pixels。
The imaging sensor 105 has chief ray incidence angles CRA (Chief Ray Angle) >=25 degree.
Bare Die (COB), ShellUT CSP can be used in imaging sensor 105 described in the specific embodiment of the invention 1,
The encapsulation such as NeoPAC CSP, TSV CSP further decrease volume.
LED illumination light source 106 described in the specific embodiment of the invention 1 has：The visible light of independence or mixed radiation and red
Outer smooth imaging wavelength.Further, LED illumination light source (106 visible lights and the infrared light described in the specific embodiment of the invention 1
LED) have：Half peak value radiation angle of visual field Ω.The half peak value radiation angle of visual field Ω meets：
Ω≥FOV；
The FOV is the full filed angle of imaging system；
FOV≥2*arctan((DI*PS)/(2*EFL))；
Wherein：EFL is the equivalent focal length of automatically focusing optical imaging lens 102；DI is 105 imaging array of imaging sensor
Image planes diagonal pixels unit quantity；PS is the physical size of the pixel unit of 105 imaging array of imaging sensor；
LED (i.e. above-described LED illumination light source) is theoretically a kind of Lambertian point sources of 360 degree of angle radiation light,
The light refraction of LED point light source radiation or reflection can be made to play convergence luminous energy control LED using convex lens or concave mirror to shine
The effect of the half peak value radiation angle of visual field in Mingguang City source.Convex lens can be by optical substrates materials such as height refraction and transmittance optical plastics
Manufacture, concave mirror can be manufactured by high optics reflectivity metal host material.Further ideal, refraction can be used in LED
The epoxy resin-matrix material high with transmissivity, the scattering colorant agent that incorporation absorbs visible transmission infrared light wavelength carry out lens
Function package realizes LED half peak value radiation angle of visual field control convergence luminous energy, and surface black is presented, and is wanted with reaching visual sense of beauty
It asks.
LED illumination light source 106 described in the specific embodiment of the invention 1 has：One or more difference angle of radiation and position
It sets, the imaging viewing field for optimizing photo electric imaging system and image quality effect.As using positioned at 100 left side of imaging system optical axis
And/or different radiation positions and different angle of radiation (left side Pl, right side Pr, left and right sides Pl&Pr, [5-30] radiation on right side
Such as 5 degree of any one or more angle in angle, 20 degree), can also be used as different angle of radiation and change in location citing
(upside Pt, downside Pb, upper and lower both sides Pt&Pb, such as 10 degree, 30 degree of any one or more angle in [5-30] angle of radiation).
A variety of angle of radiation can optimize minute surface total reflection light annoyance level, improve the image quality of photo electric imaging system.A variety of radiation
Position can improve the image quality of photo electric imaging system with the opposite brightness of illumination balance degree of optimal imaging visual field.The present invention
Different angle of radiation and change in location be not limited to the example above, other different angle of radiation and position should equally be understood.
LED illumination light source 106 described in the specific embodiment of the invention 1 has：It is imaged synchronous company with imaging sensor 105
Continuous or pulsed irradiation sessions and radiation intensity are used for the image quality effect of combined optimization photo electric imaging system.LED illumination light source
106 are imaged synchronous continuous or pulsed irradiation sessions and radiation intensity with imaging sensor 105, can optimize brightness of image, letter
Make an uproar than with motion blur degree, improve the image quality of photo electric imaging system.SMD surface patch can be used in LED illumination light source 106
Equal encapsulation further decrease volume.
Visible ray-infrared light variable wavelength optics wave filter (101 or 104) described in the specific embodiment of the invention 1 has：
Change visible light and infrared imaging wave-length coverage.Further, the visible light-described in the specific embodiment of the invention 1 is infrared
Light variable wavelength optics filter (101 or 104) has：
When changing into visual light imaging wavelength：
Light cutoff rate Fi≤10.0% in visual light imaging wave-length coverage,
Light cutoff rate Fo >=99.0% outside visual light imaging wave-length coverage,
Or of equal value
Light transmission Ti >=90.0% in visual light imaging wave-length coverage,
Light transmission To≤1.0% outside visual light imaging wave-length coverage.
When changing into infrared imaging wavelength：
Light cutoff rate Fi≤10.0% in infrared imaging wave-length coverage,
Light cutoff rate Fo >=99.0% outside infrared imaging wave-length coverage,
Or of equal value
[light transmission Ti >=90.0% in infrared imaging wave-length coverage,
Light transmission To≤1.0% outside infrared imaging wave-length coverage.
Automatically focusing optical imaging lens 102 described in the specific embodiment of the invention 1 have：Physics Refractive focusing visible light
With infrared imaging wavelength.Further, the automatically focusing optical imaging lens 102 described in the specific embodiment of the invention 1 have
To visible light and infrared imaging wavelength：
Surface maximum reflectivity Rmax≤1.0%, surface average reflectance Ravg≤0.3%；
Or of equal value
Surface minimum transmittance Tmin >=99.0%, surface average transmittance Tavg >=99.7%.
Above-described automatically focusing optical imaging lens 102 can be in aspherics plastics such as optical grade PMMA, optics
The optical substrates materials such as grade PC carry out surface multi-layer anti-reflection or anti-reflection coating is realized；And 3-5P piece aspherics plastics can be passed through
Shooting Technique realization, TTL optics overall length≤6mm.
The automatically focusing optical imaging lens have：Focal length EFL, numerical aperture FNO meet:
2mm≤EFL≤5mm, 1.4≤FNO≤2.8.
Further, optical distortion DOL (the distortion of of above-described automatically focusing optical imaging lens 102
Lens) absolute value is configured as：
DOL absolute value≤1%.
The opposite Coefficient of Utilitization IOR of above-described automatically focusing optical imaging lens 102 is configured as：
IOR >=50%.
The central vision brightness of peripheral field brightness/optical imaging lens of the IOR=optical imaging lens.
Above-described automatically focusing optical imaging lens 102 and imaging sensor 105 are configured as being mutually matched key light
Line incidence angle CRA, that is, theoretically CRA is equal, and error range absolute value is controlled in practical application and is less than or equal to 3 degree.
Automatically focusing optical imaging lens 102 are configured as fixed focal length, including liquid driven lens, liquid crystal drive are saturating
Appoint in mirror, VCM voice coil driven lens, MEMS driven lens, EDOF wave-front phase modulation lens or wafer scale microarray lens
Meaning is a kind of.Above-described liquid driven lens include fixed focus lenses, liquid lens, the voltage for controlling liquid lens
Driver 111；Above-described liquid crystal driven lens include fixed focus lenses, liquid crystal lens, for controlling liquid crystal lens
Voltage driver 111；Above-described liquid driven lens and liquid crystal driven lens are by changing the diopter of incident light both light
Power regulation is learned to realize automatic focusing function.Above-described VCM voice coil driven lens include fixed focus lenses, VCM sounds
Circle, the current driver 111 for controlling VCM voice coils；Above-described VCM voice coil driven lens were by having changed optic back focal both
Optic image distance is adjusted to realize automatic focusing function.Above-described MEMS (microelectromechanical systems) driving lens include fixing
Condenser lens, MEMS lens, the electrostatic actuator 111 for controlling MEMS lens.Above-described MEMS driven lens pass through
Change the optical position of MEMS lens to realize automatic focusing function.Above-described wafer scale array lenticule, by micro-
Lens array calculates imaging (Computational Imaging) and realizes 3D panorama depth Reconstruction of The Function.Above-described EDOF wavefront
Phase-modulation lens include lens, wave-front phase modulation optical element；Above-described EDOF wave-front phase modulations pass through wavefront
After phase modulated optical elements modulate, liftering demodulation, which is rebuild, realizes extended depth-of-field function.
The specific embodiment of the invention 1 further includes the OSI optical image stabilization driver to imaging system, passes through mobile terminal
The mobile vector information feedback optical image stabilization driver that the sensors such as integrated gyroscope provide is for controlling compensating image
The optical motion of system is fuzzy, can advanced optimize the image quality effect of photo electric imaging system.
Specifically, according to the gyroscope of the specific embodiment of the invention 1, the mobile vector that the sensors such as linear velocity meter provide is believed
Optical motion of the breath for feedback optical image stabilization driver OIS control compensating image systems is fuzzy, or is moved for feeding back 3 axis
The optical motion that dynamic vector information, i.e. angular speed and/or linear velocity are less than predetermined threshold control imaging system is fuzzy, can be further
Optimize the image quality effect of photo electric imaging system.
To remove the imaging interference of minute surface total reflection light, the LED illumination light source 106 of the specific embodiment of the invention 1 configures light
It learns in linear polarizer and imaging optical path and (is located at before or after automatically focusing optical imaging lens 102) and configure corresponding orthogonal state 90
Spend optics linear polarizer, by emit and receiving terminal formed orthogonal state linear polarization, can completely remove minute surface total reflection light at
As interference.Further, it can be configured (before or after being located at automatically focusing optical imaging lens 102) in imaging optical path tunable
The optical polarizator of polarization state can completely remove minute surface total reflection light by controlling the polarization state of tunable optical polarizer
Imaging interference.
The specific embodiment of the invention 1, being attributed to bio-identification photoelectronic imaging and visible light photoelectronic imaging has different optics
Imaging requirements, imaging wavelength, pixel spatial resolution, optical magnification, optical space resolution ratio, focusing task object distance model
It encloses.
Above-described bio-identification photoelectronic imaging is with the requirement of following optical imagery：
The imaging wavelength WI of bio-identification photoelectronic imaging meets：
750nm≤WI≤950；
The focusing task object distance WD of bio-identification photoelectronic imaging meets：
10cm≤WD≤30cm。
The pixel spatial resolution PSR (pixel spatial resolution) of bio-identification photoelectronic imaging should expire
Foot：PSR≥10pixel/mm；
The optical magnification OM (optical magnification) of bio-identification photoelectronic imaging, it should meet：
OM=PS*PSR；
Wherein described：PS is the physical size of each imaging pixel cell of imaging sensor；PSR is bio-identification photoelectricity
The pixel spatial resolution of imaging；
Optical space resolution ratio OSRI (the optical spatial resolution of of bio-identification photoelectronic imaging
Image of plane) it should meet in image space plane：When modulation transfer function is equal to 60% (MTF=0.6), 1/ (4*PS)
≤ OSRI≤1/ (2*PS) lp/mm (line is to every millimeter).
The optical imagery of bio-identification photoelectronic imaging described in the specific embodiment of the invention 1 requires can be achieved high-resolution
Iris and the extraction of vein biometric characteristic details, improve combination bio-identification performance.
The visible light photoelectronic imaging is with the requirement of following optical imagery：
The imaging wavelength WI of visible light photoelectronic imaging meets：
400nm≤WI≤650nm；
The focusing task object distance WD of visible light photoelectronic imaging meets：
30cm≤WD≤100cm。
The pixel spatial resolution PSR (pixel spatial resolution) of visible light photoelectronic imaging should meet：
PSR≤3pixel/mm；
The optical magnification OM (optical magnification) of visible light photoelectronic imaging, it should meet：
OM=PS*PSR；
Wherein described：PS is the physical size of each imaging pixel cell of imaging sensor；PSR be visible light photoelectricity at
The pixel spatial resolution of picture；
Optical space resolution ratio OSRI (the optical spatial resolution of of visible light photoelectronic imaging
Image of plane) it should meet in image space plane：When modulation transfer function is equal to 60% (MTF=0.6), 1/ (4*PS)
≤ OSRI≤1/ (2*PS) lp/mm (line is to every millimeter).
By above-described mobile terminal visible ray and bio-identification combination photoelectric imaging system, the present invention provides one kind
The imaging method of visible light photoelectronic imaging, includes the following steps：
1. processor chips 109 configure the optical filter, the LED illumination light source, described image sensor and institute
It is initial work state is specifically carried out to controller and driver of optical filter 112, LED current to state optical imaging lens
Driver 108, imaging sensor 105, the configuration of 111 initial work state of auto-focus optical imaging lens focusing driver；
2. the control of processor chips 109 controls the optical filter, the LED illumination light source, described image sensor
Enter low-power consumption standby or shutdown mode, controller and driver of optical filter 112 with the optical imaging lens, LED current is driven
Dynamic device 108, imaging sensor 105, auto-focus optical imaging lens focusing driver 111 enter low-power consumption standby or shutdown mould
Formula；
It is to go to step 4 3. processor chips judge whether to need to obtain visual light imaging image, no continuation step 3；
4. processor chips 109 change visible light-infrared light variable wavelength light by controller and driver of optical filter 112
It is to allow through visual light imaging wavelength to learn filter (101 or 104)；
LED illumination light source 106 is driven to generate visual light imaging wave 5. processor chips 109 control LED current driver 108
Long continuous or lock-out pulse pattern radiation；
6. the imaging array that processor chips 109 control imaging sensor 105 receives global frame imaging pattern or rolls row
The original image RAW RGB pixel datas I { Y } of imaging pattern output；
7. processor chips 109 are according to imaging original image RAW pixel datas I { Y } and pixel unit opto-electronic conversion relationship,
Imaging sensor 105 and LED current driver 108 and auto-focus optical imaging lens focusing driver 111 are driven, is realized anti-
Feedback control；
8. processor chips 109 are respectively to original image RAW pixel datas I { Y } interpolation reconstructions and image procossing；
9. processor chips 109 export the image I { r, g, b } after interpolated reconstruction and image procossing；
10. return to step 2 recycles.
Feedback control includes in the step 7 of the imaging method of visible light photoelectronic imaging described above：
1. the imaging original image RAW pixel datas I { Y } that processor chips 109 can be exported according to imaging sensor 105
With corresponding formula EQ1, the reset time of integration of feedback control imaging sensor 105, number and/or analog gain are arranged, instead
Feedback control LED current driver 108 drives the radiation intensity of LED illumination light source 106 and radiated time to be used to improve into image quality
Amount.
2. the imaging original image RAW pixel datas I { Y } that processor chips 109 can be exported according to imaging sensor 105
It calculates minute surface in image and is totally reflected annoyance level, feedback control LED current driver 108 drives LED illumination light source 106 for controlling
Angle of radiation processed and position are to improve image quality.
3. processor chips 109 can be anti-according to the focus mass value for calculating the original RAW pixel datas I { Y } of image
Feedback control auto-focus optical imaging lens focusing driver 111 drives automatically focusing optical imaging lens 102 to realize visible light
Photoelectronic imaging focusing task object distance WD at least 30cm-100cm.Conventional known Atomatic focusing method such as focus quality can be used most
Big peak value obscures accurate iterative search.
Processor chips 109 can by light sensor (the case where according to using, can be in processor chips 109
Individually an additional device, the method being arranged are present known technology in this way for setting, or can also be by market
The upper corresponding processor chips of buying realize such light sensor function) according to current environmental light brightness, control LED current
Driver 108 drives the radiation intensity of 106 visible light of LED illumination light source.Further, if 1 light of the specific embodiment of the invention
When line sensor judges to be more than 500-1000lux or more according to current environmental light brightness, closes LED current driver and drive LED
106 visible light of lighting source.
It further explains, the interpolated reconstruction described in the step 8 of the imaging method of visible light photoelectronic imaging described above
Conventional known interpolation algorithm can be used.
Image procossing described in the step 8 of the imaging method of visible light photoelectronic imaging includes imagery optical black-level correction
BLC, automatic white balance AWB, color matrices correction CCM, the positive lens shading correction of lens shading correction, from
Dynamic exposure feedback control AEC, automatic gain feedback control AGC etc..
By above-described mobile terminal visible ray and bio-identification combination photoelectric imaging system, the present invention provides one kind
The imaging method of bio-identification photoelectronic imaging, includes the following steps：
1. processor chips 109 configure the optical filter, the LED illumination light source, described image sensor and institute
It is initial work state is specifically carried out to controller and driver of optical filter 112, LED current to state optical imaging lens
Driver 108, imaging sensor 105, the configuration of 111 initial work state of auto-focus optical imaging lens focusing driver；
2. processor chips 109 control the optical filter, the LED illumination light source, described image sensor and institute
It states optical imaging lens and enters low-power consumption standby or shutdown mode, specifically, i.e., controller and driver of optical filter 112, LED are electric
Driver 108, imaging sensor 105 are flowed, auto-focus optical imaging lens focusing driver 111 enters low-power consumption standby or pass
Machine pattern；
It is to go to step 4 3. processor chips judge whether to need to obtain bio-imaging image, no continuation step 3；
4. processor chips 109 change visible light-infrared light variable wavelength light by controller and driver of optical filter 112
It is to allow through infrared imaging wavelength to learn filter (101 or 104)；
LED illumination light source 106 is driven to generate infrared imaging wave 5. processor chips 109 control LED current driver 108
Long continuous or lock-out pulse pattern radiation；
6. the imaging array that processor chips 109 control imaging sensor 105 receives global frame imaging pattern or rolls row
The original image RAW RGB pixel datas I { Y } of imaging pattern output；
7. processor chips 109 are according to imaging original image RAW pixel datas I { Y } and pixel unit opto-electronic conversion relationship,
Imaging sensor 105 and LED current driver 108 and auto-focus optical imaging lens focusing driver 111 are driven, is realized anti-
Feedback control；
8. processor chips 109 export image I { Y }；
9. return to step 2 recycles.
105 initial work state of imaging sensor is configured as RAW RGB pictures in 1 step 1 of the specific embodiment of the invention
Plain output format, RGB channel compensating gain or the processing of RGB channel balancing gain can configure setting figure by initial work state
It is realized as the corresponding RGB channel number and/or analog gain of sensor 105 simplify.Further image imaging sensor
105, color matrices correction CCM is disabled, interpolation interpolation is disabled, disabling Gamma corrections disable automatic white balance
AWB causes biological image contrast to reduce using these functions, and special texture high frequency edge part influences biometric image quality.
Feedback control includes in the step 7 of the imaging method of bio-identification photoelectronic imaging described above：
1. the imaging original image RAW pixel datas I { Y } that processor chips 109 can be exported according to imaging sensor 105
With corresponding formula EQ1, the reset time of integration of feedback control imaging sensor 105, number and/or analog gain are arranged, instead
Feedback control LED current driver 108 drives the radiation intensity and radiated time of LED illumination light source 106, bright for controlling image
Degree, signal-to-noise ratio and motion blur degree improve image quality.
2. the imaging original image RAW pixel datas I { Y } that processor chips 109 can be exported according to imaging sensor 105
Minute surface total reflection annoyance level and opposite brightness of illumination balance degree, feedback control LED current driver 108 in image is calculated to drive
Dynamic LED illumination light source 106 is for controlling angle of radiation and position to improve image quality.
3. processor chips 109 can be anti-according to the focus mass value for calculating the original RAW pixel datas I { Y } of image
Feedback control auto-focus optical imaging lens focusing driver 111 drives automatically focusing optical imaging lens 102 to realize biological knowledge
Other photoelectronic imaging focusing task object distance WD at least 10cm-30cm.Conventional known Atomatic focusing method such as focus quality can be used
Peak-peak obscures accurate iterative search.
Further, the original RAW pixels of image that processor chips 109 can be exported by imaging sensor 105
Data, the optical black level for executing imaging sensor correct BLC, automatic exposure feedback control AEC, automatic gain feedback control
AGC。
In view of bio-identification focusing requirement, high pixel spatial resolution, big optical magnification, the focusing task of microspur
When object distance range, conventional known Atomatic focusing method such as focus quality peak-peak obscure accurate iterative search and need 1s
Between more than.
To realize that the fast and stable in 100ms focuses automatically, the specific embodiment of the invention 1 passes through above-described mobile whole
Visible ray and bio-identification combination photoelectric imaging system is held, provides a kind of a kind of fast automatic focusing method of offer, including following
Step：
1. according to scheduled focusing task object distance range WD, defines local region of interest ROI to be searched and search is joined
Number；
Defining local region of interest ROI to be searched can be determined by following formula；
1/EFL=1/ROI+1/WD；
Wherein：The EFL is automatically focusing optical imaging lens fixed focal length；
WD is scheduled biological focusing task object distance range, 10-30cm；
ROI is corresponding local region of interest range to be searched；
Defining search parameter includes：
Step-size in search SStep and searching times SNO can be determined by following formula：
SStep=k*PS；
SNO=ROI/SStep；
Wherein：The PS is the physical size of the imaging pixel cell of imaging sensor 105；
K is the acceptable circle of confusion diameter dimension of biological recognizer；
2. processor chips 109 control auto-focus optical imaging lens focusing driver 111 and are waited for according to defined in step 1
The local region of interest ROI and search parameter of search, driving automatically focusing optical imaging lens 102 execute on dull direction
Continuity focal position is searched for.It executes and is searched in dull direction continuity from above focal position { Pi, i=1, SNO }；
Dull direction continuity focal position is searched for, can be to avoid using conventional known Atomatic focusing method such as focus matter
Amount peak-peak, which obscures accurate iterative search, leads to both forward and reverse directions repeatedly, has efficiently, stablizes, focusing speed is fast.
3. processor chips 109 control in 105 obtaining step 2 of imaging sensor in dull direction continuity from above focal position
The imaging original image RAW RGB pixel datas I { Pi, i=1, NO } of { Pi, i=1, SNO } search output；
4. 109 chip of processor calculates the focus quality Q S (I of focal position search image I { Pi, i=1, NO } in real time
{Pi})；The function QS is focus quality evaluation functions, and the method that the focus quality evaluation functions use includes：Gradient
Statistics, frequency statistics, high pass or band logical spatial filter, high-frequency energy Data-Statistics, variance statistic, space-frequency domain filter
The methods of；The focus quality evaluation functions QS of the present invention is not limited to the example above, and other methods should equally be understood.
5. processor 109 judges the corresponding images of pinpointed focus quality arg { QS (I { Pi }) } for optimum focusing image；
The corresponding focus quality maximum value images of arg { QS (I { Pi }) }=max { QS (I { Pi }) } are optimum focusing image；
Further,
Arg { QS (I { Pi }) }={ QS (I { Pi-1 })<QS(I{Pi})>QS (I { Pi+1 }) } corresponding focus quality is maximum
Value image is optimum focusing image；
It can also be used
Arg { QS (I { Pi }) }={ QS (I { Pi })>EI) } corresponding focus quality image is optimum focusing image；
EI is the acceptable image focal point quality threshold of biological recognizer.
The judgement focus quality method of the present invention is not limited to the example above, and other methods should equally be understood.
The present invention provides a kind of bio-identification forgery proofing biopsy method of high security, has to bio-identification puppet
The divine force that created the universe is with real-time detectability, the safety for ensureing bio-identification itself, in the following ways：
The biological tissue's enhanced spectrometry-active characteristic generated by visible light-infrared imaging wavelength radiation the side of detection in real time
Method.
By above-described mobile terminal visible ray and bio-identification combination photoelectric imaging system, the present invention provides one kind
Biological tissue's enhanced spectrometry-active characteristic real-time detection method that visible light-infrared imaging wavelength radiation generates, including following step
Suddenly：
1. processor chips 109 change visible light-infrared light variable wavelength light by controller and driver of optical filter 112
It is visual light imaging wavelength to learn filter (101 or 104)；
109 drive control LED current driver 108 of processor chips drives LED illumination light source 106 to generate visual light imaging
Wavelength radiation；
Processor chips 109 obtain the visual light imaging wavelength image Ivs of 105 imaging array of imaging sensor；
2. processor chips 109 change visible light-infrared light variable wavelength light by controller and driver of optical filter 112
It is infrared imaging wavelength to learn filter (101 or 104)；
109 drive control LED current driver 108 of processor chips drives LED illumination light source 106 to generate infrared imaging
Wavelength radiation；
Processor chips 109 obtain the infrared imaging wavelength image Iir of 105 imaging array of imaging sensor；
3. processor chips 109 calculate step 1, visual light imaging wavelength image Ivs and infrared imaging wavelength image in 2
The contrast C data of Iir, respectively Ivs_C and Iir_C；
Wherein：
Contrasts of the C between iris region and iris exterior domain；
Or
Contrasts of the C between venosomes and vein exterior domain；
C=S (Yiris)/S (Youtiris)；
Or
C=S (Youtvein)/S (Yvein)；
Yiris indicates iris region pixel；
Youtiris indicates iris exterior domain pixel；
Yvein indicates venosomes pixel；
Youtvein indicates vein exterior domain pixel；
The function S is corresponding region pixels statistics valuation functions, the method that the pixels statistics valuation functions use
Including：Statistics with histogram, frequency statistics, average value statistics, weighted average Data-Statistics, median statistics, energy value statistics, variance system
Meter, gradient statistics, space-frequency domain filter etc.；The corresponding region pixels statistics valuation functions S of the present invention is not limited to above-mentioned act
Example, other methods should equally be understood.
4. processor chips 109 calculate the figure of visual light imaging wavelength radiation and infrared imaging wavelength radiation in real time respectively
Image contrast Ivs_C and Iir_C activity change rate Δ ρ；
Wherein：
Δ ρ=Iir_C/Ivs_C*100%；
5. according in visible light-infrared imaging wavelength radiation biological tissue enhanced spectrometry-active characteristic preset value and step 4
The active contrast respective change rate of data value Δ ρ, Rule of judgment Δ ρ > 300% realize detection biological living state in real time.
Equally understand, biological tissue's enhanced spectrometry-active characteristic that above-mentioned visible light-infrared imaging wavelength radiation generates
Step 1 and 2 sequences in real-time detection method have equivalence, can exchange.
Bio-identification success rate is improved to realize, the specific embodiment of the invention 1 (is known according to the visible light or organisms of mobile terminal
Other combination photoelectric imaging system) a kind of imaging method for improving bio-identification success rate is provided, include the following steps：
1. the LED illumination light source 106 of acquisition at least two or more is generated in different angle of radiation and position when registration
Infrared imaging wavelength biometric image Iir { P ψ enroll }；
The citing of the specific embodiment of the invention 1 is using different angle of radiation and position citing such as left side Pl, right side Pr, left and right two
Side Pl&Pr, upside Pt, downside Pb, upper and lower both sides Pt&Pb, such as 5 degree of any one or more angle in [5-30] angle of radiation,
10 degree, 20 degree, 30 degree).
2. calculating the biometric templates of acquisition at least two or more using biometric image Iir { P ψ enroll }
Template { P ψ enroll }, carry out feature templates between intersect compare successfully after, save as the biometric templates of registration；
The intersection, which compares, illustrates, and such as obtains 3 biometric templates Template { 1,2,3 } and intersect comparing and divides
It Wei not Template1-Template2, Template1-Template3, Template2-Template3；Only as above-mentioned spy
Intersect between sign template after comparing successfully, just can guarantee stability and the identification of the biometric templates of the registration for subsequently identifying
Rate.
3. the LED illumination light source 106 of acquisition one or more generates red in different angle of radiation and position when identification
Outer smooth imaging wavelength biometric image Iir { P ψ recogn }；
4. calculating feature templates Template { the P ψ generated using one or more biometric image Iir { P ψ recogn }
Recogn } it carries out intersecting comparison between the biometric templates Template { P ψ enroll } of registration and obtains recognition result；
Bio-identification success rate is improved to realize, the specific embodiment of the invention 1 (is known according to the visible light or organisms of mobile terminal
Other combination photoelectric imaging system) another imaging method for improving bio-identification success rate, including following step are provided again
Suddenly：
1. the LED illumination light source 106 of acquisition at least two or more generates infrared in different radiation intensity when registration
Light imaging wavelength biometric image Iir { Renroll }；
The citing of the specific embodiment of the invention 1 generates biological tissue's such as pupil using different visible light and infrared light radiation intensity
Stimulation
Active infrared imaging wavelength biometric image, such as generate 1 times, 2 times, 4 times or more of different visible light and/or
Infrared light radiation intensity；
2. calculating the biometric templates of acquisition at least two or more using biometric image Iir { Renroll }
Template { Renroll }, carry out feature templates between intersect compare successfully after, save as the biometric templates of registration；
The intersection, which compares, illustrates, and such as obtains 3 biometric templates Template { 1,2,3 } and intersect comparing and divides
It Wei not Template1-Template2, Template1-Template3, Template2-Template3；Only as above-mentioned spy
Intersect between sign template after comparing successfully, just can guarantee stability and the identification of the biometric templates of the registration for subsequently identifying
Rate.
3. when identification the infrared light that is generated in different radiation intensity of LED illumination light source 106 of acquisition one or more at
As wavelength biometric image Iir { Rrecogn }；
4. calculating the feature templates Template generated using one or more biometric image Iir { Rrecogn }
It carries out intersecting comparison between { Rrecogn } and the biometric templates Template { Renroll } of registration and obtains recognition result；
Bio-identification success rate is improved to realize, the specific embodiment of the invention 1 (is known according to the visible light or organisms of mobile terminal
Other combination photoelectric imaging system) a kind of still further imaging method for improving bio-identification success rate is also provided, including it is following
Step：
1. the LED illumination light source 106 of acquisition at least two or more is generated in different radiated wavelength ranges when registration
Infrared imaging wavelength biometric image Iir { Wenroll }；
The citing of the specific embodiment of the invention 1 using LED illumination light source 106 generate the infrared lights of different radiated wavelength ranges at
As wavelength biometric image, citing such as generates 750nm-800nm, 800nm-850nm, 850nm-900nm, 900nm-950nm respectively,
The difference radiated wavelength range such as 750nm-850nm, 850nm-950nm or combination.
2. calculating the biometric templates of acquisition at least two or more using biometric image Iir { Wenroll }
Template { Wenroll }, carry out feature templates between intersect compare successfully after, save as the biometric templates of registration；
The intersection, which compares, illustrates, and such as obtains 3 biometric templates Template { 1,2,3 } and intersect comparing and divides
It Wei not Template1-Template2, Template1-Template3, Template2-Template3；Only as above-mentioned spy
Intersect between sign template after comparing successfully, just can guarantee stability and the identification of the biometric templates of the registration for subsequently identifying
Rate.
3. the LED illumination light source 106 of acquisition one or more generates infrared in different radiated wavelength ranges when identification
Light imaging wavelength biometric image Iir { Wrecogn }；
4. calculating the feature templates Template generated using one or more biometric image Iir { Wrecogn }
It carries out intersecting comparison between { Wrecogn } and the biometric templates Template { Wenroll } of registration and obtains recognition result；
The specific embodiment content and technical characteristic that the present invention describes, can be in the range of identical or equivalent understanding by reality
It applies, if imaging wavelength range changes, imaging sensor variation, LED illumination light source variation, optical filter changes, automatic to focus
Optical imaging lens change, light chopper, and device replacement also should equally be understood.
As an example, the LED illumination light source visible long-wave radiation for the specific embodiment that the present invention describes, can also be used shifting
The display screen that dynamic terminal itself has replaces, as LCD display has the RGB back lights of brightness-adjustable or itself has RGB
The organic matter illuminating OLED of radiation.
Further citing, controller and driver of optical filter can be by installing personal control such as manual switch etc.
With replacement.
Finally, it should also be noted that it is listed above be only the present invention several specific embodiments.Obviously, this hair
Bright to be not limited to above example, acceptable there are many deformations.Those skilled in the art can be from present disclosure
All deformations for directly exporting or associating, are considered as protection scope of the present invention.
Claims (8)
1. a kind of driving auto focusing method for living things feature recognition mobile terminal includes the following steps：
1) according to scheduled focusing task object distance range, local region of interest to be searched and search parameter are defined；
2) control optical imaging lens are according to local region of interest and search parameter to be searched defined in step 1), and driving is certainly
The dynamic optical imaging lens that focus are executed in the search of dull direction continuity from above focal position；
3) control imaging sensor obtaining step 2) in the search output of dull direction continuity from above focal position imaging it is original
Image pixel data；
4) the focus quality of focal position search image I { Pi, i=1, NO } is calculated in real time, and assesses focus quality；
5) judge the corresponding image of pinpointed focus quality for optimum focusing image；
Described search parameter in the wherein described step 2) includes step-size in search SStep and searching times SNO, true by following formula
It is fixed：
SStep=k*PS；
SNO=ROI/SStep；
Wherein：The PS is the physical size of the imaging pixel cell of imaging sensor；
K is the acceptable circle of confusion diameter dimension of biological recognizer；
ROI is corresponding local region of interest range to be searched.
2. driving auto focusing method as described in claim 1, wherein defining part sense to be searched in the step 1)
Interest region ROI is determined by following formula；
1/EFL=1/ROI+1/WD；
Wherein：The EFL is automatically focusing optical imaging lens fixed focal length；
WD is scheduled biological focusing task object distance range；
ROI is corresponding local region of interest range to be searched.
3. driving auto focusing method as claimed in claim 2, wherein the scheduled biological focusing task object distance range is
10‐30cm。
4. driving auto focusing method as described in claim 1, wherein the assessment letter of the focus quality described in the step 4)
Number QS is selected from least one of following method：Gradient counts, frequency statistics, high pass or band logical spatial filter, high-frequency energy
Data-Statistics, variance statistic, space-frequency domain filter.
5. driving auto focusing method as described in claim 1, wherein the step 5) judges the method for pinpointed focus quality
For：The corresponding focus quality maximum value images of arg { QS (I { Pi }) }=max { QS (I { Pi }) } are optimum focusing image, wherein
The QS is the valuation functions of focus quality.
6. driving auto focusing method as described in claim 1, wherein the step 5) judges the method for pinpointed focus quality
For：Arg { QS (I { Pi }) }={ QS (I { Pi-1 })<QS(I{Pi})>QS (I { Pi+1 }) } corresponding focus quality maximum value figure
As being optimum focusing image, wherein the QS is the valuation functions of focus quality.
7. driving auto focusing method as described in claim 1, wherein the step 5) judges the method for pinpointed focus quality
For：Arg { QS (I { Pi }) }={ QS (I { Pi })>EI) } corresponding focus quality image is optimum focusing image, wherein the QS
For the valuation functions of focus quality, EI is the acceptable image focal point quality threshold of biological recognizer.
8. a kind of mobile terminal for living things feature recognition, the mobile terminal includes optical imaging lens and image sensing
Device, it is characterized in that：It carries out driving automatic focusing using the method as described in any one of claim 1-7.
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| CN201510809786.6A Active CN105426848B (en) | 2014-11-03 | 2014-11-03 | Imaging method for improving success rate of biological recognition |
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| CN105354557B (en) * | 2014-11-03 | 2019-04-16 | 苏州思源科安信息技术有限公司 | A kind of bio-identification forgery proofing biopsy method |
| US11045088B2 (en) | 2015-02-27 | 2021-06-29 | Welch Allyn, Inc. | Through focus retinal image capturing |
| CN108027887A (en) * | 2015-05-15 | 2018-05-11 | 空气融合有限公司 | Portable set and method for the decision support for automating Fusion and analysis in real time |
| CN106407881B (en) * | 2015-07-29 | 2020-07-31 | 财团法人工业技术研究院 | Biological identification device and method and wearable carrier |
| CN106570441A (en) * | 2015-10-09 | 2017-04-19 | 微软技术许可有限责任公司 | System used for posture recognition |
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| CN105357426B (en) | 2019-01-15 |
| CN104301633A (en) | 2015-01-21 |
| CN105426848B (en) | 2020-12-18 |
| CN105354557A (en) | 2016-02-24 |
| CN104301633B (en) | 2016-01-20 |
| CN105354557B (en) | 2019-04-16 |
| CN105376469A (en) | 2016-03-02 |
| CN105426848A (en) | 2016-03-23 |
| WO2016070781A1 (en) | 2016-05-12 |
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