CN104394311A - Iris identification imaging module for mobile terminal and image acquisition method - Google Patents

Abstract

The invention discloses an iris identification imaging module for a mobile terminal. The mobile terminal comprises a mobile terminal mainboard, a processor chip integrated with a safety function, a near infrared LED (Light-Emitting Diode) current driver, a memory having a safety reading-writing access function, a storage having a safety reading-writing access function, a power supply management module and a display screen. The iris identification imaging module consists of a near infrared LED illuminating light source and an iris identification imaging module optical component; the iris identification imaging module optical component comprises a front and/or rear near infrared optical filter, an optical imaging lens, an image imaging sensor and a connecting line; the processor chip integrated with the safety function is connected with the near infrared LED current driver and the iris identification imaging module through connecting lines, thereby realizing feedback control; and the near infrared LED current driver is used for drive control of the radiation intensity and radiation period of the near infrared LED illuminating light source of the iris identification imaging module.

Description

For iris recognition imaging modules and the image acquiring method of mobile terminal

Technical field

The present invention relates to a kind of iris recognition imaging modules for mobile terminal and image acquiring method, belong to bio-identification photoelectric field.

Background technology

Mobile terminal comprises smart mobile phone, flat board, wearable device etc., present information technology mobile development trend, and mobile terminal device is necessarily following is suitable for equipment the most widely.

At present, mobile terminal in real world applications pays at mobile security, account safety logs in, use extremely extensive in Web bank, as the utilization of the aspects such as remaining sum treasured (APP), micro-letter (APP), credit card management (APP), although in its use procedure, for life brings great convenience, but a kind of novel economic crime rise gradually undertaken by features such as security of mobile terminal energy weaknesses.

And in mobile terminal, the customary means that prior art carries out identity validation is exactly Password Input, but the means security performance of this identity validation very low, only need to implant simple Virus on mobile terminals, just this password can be revealed, cause corresponding loss.In order to address this problem, still carry out mobile terminal safety authentication by the mode of bio-identification in the world; As the fingerprint identification technology based on the exploitation of AuthenTec company that Apple proposes, this Technology application, on mobile phone terminal, greatly improves the identity validation fail safe of mobile terminal; But, in the process of fingerprint technique identification, because fingerprint is static, although have uniqueness, but be also extremely easily acquired finger print information, even be imitated, so, along with fingerprint technique utilization is on mobile terminals more and more extensive, its fail safe also can be on a declining curve accordingly, so the iris recognition more in fail safe with advantage solves very effective method in mobile terminal safety authentication procedures, and iris authentication system is that in existing bio-identification, safe active false proof feature is the safest.

In current all iris authentication system technology and product, most typical be all used in large-scale gate inhibition or clearance application, power consumption is abnormal up to more than 10 watts, control complex, abnormal huge more than the 20cm*20cm*10cm of volume, more than high 1000 U.S. dollars of cost, basic characteristics all can not meet the use standard on mobile terminal.

Further, be applied to mobile terminal to need to solve following serious problem:

1, in mobile terminal application, iris authentication system needs the iris recognition imaging modules of a whole set of microminiaturization, and meet the trend that mobile terminal is day by day thin, its fixing fabric structure is in 8mm*8mm*6mm.

2, in mobile terminal application, iris authentication system needs the iris recognition imaging modules of a whole set of Micro Energy Lose, meets the day by day thin requirement to low-power consumption of mobile terminal, when identifying works in power consumption control 300mW.

3, in mobile terminal application, iris authentication system needs a whole set of to simplify efficient image acquiring method, meets and completed high-quality iris image acquisition within 1 second time.

4, for mobile terminal iris recognition imaging modules, each part and parameter need optimised combination to configure.

5, in mobile terminal application, iris recognition imaging modules needs greatly to reduce costs, and cost could be applied within being reduced to 10 U.S. dollars on a large scale.

Overcoming the above problems is the current ultimate challenge applied iris authentication system technology in the terminal and face.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of iris recognition imaging modules for mobile terminal safety authentication and image acquiring method.

In order to solve the problems of the technologies described above, the invention provides a kind of iris recognition imaging modules for mobile terminal, comprise setting iris recognition imaging modules on mobile terminals; This mobile terminal comprises Mobile terminal main board, the processor chips of integrated security feature, near-infrared LED current driver driver, the internal memory of safe read-write access function, the memory of safe read-write access function, power management module and display screen; Described processor chips are for performing PKI encryption and Digital Signature Algorithm protects iris recognition code and iris templates and iris recognition result; Described processor chips are also connected with internal memory and memory respectively, complete the safety compute performing iris recognition code and iris templates and the safe storage function performing iris recognition code and iris templates; Described iris recognition imaging modules is made up of near-infrared LED lighting source and iris recognition imaging modules optics; Described iris recognition imaging modules optics comprises and carries out the preposition of imaging wavelength filtration and/or rearmounted near infrared light optical light filter, the optical imaging lens that imaging wavelength light after near-infrared optical filter filters is focused on, the image imaging sensor to the imaging wavelength image formation by rays focused on by optical imaging lens, and the image of image imaging sensor is carried out the connecting line of Signal transmissions; Described processor chips are interconnected by connecting line with near-infrared LED current driver and iris recognition imaging modules respectively and realize FEEDBACK CONTROL; The near-infrared LED lighting source radiation intensity of described near-infrared LED current driver drived control iris recognition imaging modules and radiation period.

Improvement as to the iris recognition imaging modules for mobile terminal of the present invention: described image imaging sensor and near-infrared LED lighting source be combined configure as follows: near-infrared LED lighting source and image imaging sensor realize synchronous pulse period radiation/exposure mode and/or synchronous consecutive periods radiation/exposure mode; Described near infrared light optical light filter and near-infrared LED lighting source and optical imaging lens combine and are configured as follows: the central peak wavelength of near infrared light optical light filter equals the central peak wavelength of near-infrared LED lighting source and the center chromatic aberration correction wavelength of optical imaging lens; Half peak transmission wavelength bandwidth FWHM of near infrared light optical light filter effectively mates or covers half peak emission wavelength bandwidth FWHM of near-infrared LED lighting source and the chromatic aberration correction wave-length coverage of optical imaging lens; The configuration that is combined of described image imaging sensor and optical imaging lens is as follows: chief ray incidence angles CRA >=20 degree of mutually mating; Described near-infrared LED lighting source and optical imaging lens and image imaging sensor be combined configure as follows: the brightness half peak value radiation angle of near-infrared LED lighting source is more than or equal to the angle of visual field of optical imaging lens, and the angle of visual field of optical imaging lens is more than or equal to the image planes physical size of image imaging sensor.

Further improvement as to the iris recognition imaging modules for mobile terminal of the present invention: the consecutive periods that described near-infrared LED lighting source radiation and/or near-infrared LED lighting source radiation synchronous with the pulse period that image imaging sensor picture frame exposes and image imaging sensor picture frame expose is synchronous; Described radiation/exposure cycle T is configured to: 3.33ms millisecond≤T≤33.33ms millisecond; Described near-infrared LED lighting source radiation intensity I is configured to: I≤100mW/sr; Described image imaging sensor image reads frame rate R and is configured to: R >=30fps frame is per second; Described near-infrared LED lighting source central peak wave-length coverage 750-880nm, half-peak band width FWHM is 10-60nm; Described near-infrared optical filter center peak wavelength scope 750-880nm, half-peak band width FWHM is 10-60nm; The chromatic aberration correction wave-length coverage 750-880nm of described optical imaging lens; Described near infrared light optical light filter is reflect visible light and the transmission near infrared light for imaging wavelength, or absorbs the near infrared light that visible ray and transmission be used for imaging wavelength; Described near infrared light optical light filter is any one in narrowband NIR optical light filter or the logical near infrared light optical light filter of band; The image planes physical size SOI of described image imaging sensor is configured to: SOI=DOI*SOP; Described DOI is the image planes diagonal pixels quantity of image imaging sensor; SOP is the physical size of image imaging sensor unit picture element; The angle of visual field FOV of described optical imaging lens is configured to: FOV >=2*arctan ((SOI)/(2*EFL)); EFL is the equivalent focal length value of optical imaging lens; Described near-infrared LED lighting source brightness half peak value radiation angle AOR is configured to: AOR >=FOV; Described FOV is the angle of visual field of optical imaging lens.

Further improvement as to the iris recognition imaging modules for mobile terminal of the present invention: described iris recognition imaging modules optics configures the outer surface protecting window be made up of toughened glass or sapphire glass, described outer surface is provided with the coating for surface protection that anti-foreign matter is polluted; The guiding instruction of described iris recognition imaging modules is configured as follows: near-infrared optical filter reflection visible ray carries out minute surface visual feedback and visible ray guides the guiding of indicator light formation to indicate, and/or display screen is shown as the guiding instruction formed as image feedback.

Further improvement as to the iris recognition imaging modules for mobile terminal of the present invention: described image imaging sensor is configured to RAW RGB Bayer pixel output format, uses RGB channel compensation gain or the gain of RGB channel balance,

$G={\∫}_{\mathrm{\λ}-\mathrm{\Δ\λ}}^{\mathrm{\λ}+\mathrm{\Δ\λ}}g\left(\mathrm{\λ}\right)f\left(\mathrm{\λ}\right)\mathrm{d\λ}$

$R={\∫}_{\mathrm{\λ}-\mathrm{\Δ\λ}}^{\mathrm{\λ}+\mathrm{\Δ\λ}}r\left(\mathrm{\λ}\right)f\left(\mathrm{\λ}\right)\mathrm{d\λ}$

$B={\∫}_{\mathrm{\λ}-\mathrm{\Δ\λ}}^{\mathrm{\λ}+\mathrm{\Δ\λ}}b\left(\mathrm{\λ}\right)f\left(\mathrm{\λ}\right)\mathrm{d\λ}$

With G channel compensation or balancing gain for standardizing standard, G_CGC=1.0; R channel compensation or balancing gain R_CGC=G/R; Channel B compensates or balancing gain B_CGC=G/B; Described λ is near-infrared LED lighting source peak wavelength, Δ λ is near-infrared LED lighting source peak wavelength half-peak band width FWHM, g (λ), r (λ), b (λ) is respectively photoelectricity conversion quantum efficiency or the spectrum sensitivity function of image imaging sensor RGB passage, and f (λ) is Wavelength distribution function; The simulation of described image imaging sensor and/or the maximum of digital gain GAIN are configured to: image imaging sensor signal to noise ratio snr >=36db that GAIN maximum produces; The image resolution ratio ROI of described image imaging sensor is configured to: ROI >=1920pixels*1080pixels.

Further improvement as to the iris recognition imaging modules for mobile terminal of the present invention: the optical distortion DOL absolute value of described optical imaging lens is configured to: DOL absolute value≤1%; The EFL equivalent focal length value of described optical imaging lens is configured to: SOP*1000pixel≤EFL≤3*SOP*1000pixel; Described SOP is the physical size of image imaging sensor unit picture element, unit um/pixel; Described pixel is pixel unit; The relative Coefficient of Utilitization IOR of described optical imaging lens is configured to: IOR >=50%; Described IOR is the central vision brightness of the peripheral field brightness/optical imaging lens of optical imaging lens; The fixed constant aperture of described optical imaging lens or relative aperture F reciprocal are configured to: F=EFL/D; 0.5*SOP/ (1.22* λ)≤F≤2.0*SOP/ (1.22* λ); Described D is the pupil of optical imaging lens or the diameter of clear aperature, and EFL is the equivalent focal length value of optical imaging lens, and SOP is the physical size of image imaging sensor unit picture element, and λ is near-infrared LED lighting source peak wavelength; Described optical imaging lens adopts plastic aspherical element optical mirror slip injection molding process, adopts the whole aberration of 3-5P lenses which correct.

A kind of image acquiring method of the iris recognition for mobile terminal: comprise the following steps: iris recognition imaging modules initial configuration;

1. near-infrared LED current driver and image imaging sensor enter the low-power consumption mode of shutdown Shutdown or standby standby, to save most power consumption;

2. processor chips detect the need of acquisition iris image, are go to step 4, no continuation step 3;

3. near-infrared LED current driver and image imaging sensor proceed to normal mode of operation from shutdown Shutdown or standby standby low-power consumption mode, and near-infrared LED lighting source opened by near-infrared LED current driver;

4. image imaging sensor exports the view data after pulse period radiation/exposure synchronous with near-infrared LED lighting source and/or the radiation/exposure of synchronous consecutive periods;

5. processor chips are according to iris image, and FEEDBACK CONTROL iris recognition imaging modules is until gather acquisition high-quality iris image;

6. terminate to obtain iris image, return step 2 and circulate.

8, the iris recognition image acquiring method for mobile terminal according to claim 7, is characterized in that:

Described iris recognition imaging modules initial configuration, comprises the following steps:

1. near-infrared LED current driver reset reset, image imaging sensor reset reset;

2. near-infrared LED current driver pattern is configured synchronous pulse period radiation and/or consecutive periods radiation mode;

3. image imaging sensor configuration MIPI or parallel interface, configuration data carry-out bit width 8/10/12bit, image imaging sensor configurable clock generator PLL and frame read-out speed R, image imaging sensor configuration image resolution ROI;

4. image imaging sensor configuration RAW RGB Bayer pixel output format, the configuration RGB channel compensation gain of image imaging sensor or the gain of RGB channel balance, image imaging sensor configuration simulation and/or digital gain GAIN;

5. the image imaging sensor configuration pulse period exposure mode synchronous with near-infrared LED lighting source radiation mode and/or synchronous consecutive periods exposure mode.

Improvement as to the iris recognition image acquiring method for mobile terminal of the present invention: described processor chips are according to iris image, FEEDBACK CONTROL iris recognition imaging modules is until gather acquisition high-quality iris image, the near-infrared LED lighting source comprised for iris recognition image acquisition controls, and comprises the following steps:

(i) the processor chips of integrated security feature obtain illuminance distribution and the mirror-reflection annoyance level of iris image light source irradiation according to iris image;

(ii) judge whether present intensity distributing homogeneity and mirror-reflection annoyance level meet iris image quality; Be go to step 1, noly go to step 3;

(iii) select to switch bilateral or left and right either side near-infrared LED lighting source;

(iv) return step 1 to circulate.

Further improvement as to the iris recognition image acquiring method for mobile terminal of the present invention: described processor chips are according to iris image, FEEDBACK CONTROL iris recognition imaging modules is until gather acquisition high-quality iris image, the guiding instruction comprised for iris recognition image acquisition controls, and comprises the following steps:

I, judgement guide indicating mode to be that minute surface visual feedback or display screen are shown as picture image feedback;

II, be designated as minute surface visual feedback when guiding, show state prompting visible ray VSLED guides indicator light, and indicating user uses OK range, instruction recognition failures, and instruction identifies successfully;

III, when guiding be designated as display screen be shown as picture image feedback, on a display screen indicating user use OK range, instruction recognition failures, instruction identify successfully;

IV, return step 1 and circulate.

Further improvement as to the iris recognition image acquiring method for mobile terminal of the present invention: described processor chips are according to iris image, FEEDBACK CONTROL iris recognition imaging modules is until gather acquisition high-quality iris image, comprise the brilliance control of visible ray VSLED indicator light for iris recognition image acquisition and/or display screen, comprise the following steps:

I, processor chips obtain pupil and iris natural scale value ρ according to iris image;

II, judging current pupil and iris natural scale value whether in predetermined bound [ρ h, ρ l] scope, is go to step 1, noly goes to step 3;

III, judge as ρ >=ρ h, the brightness of visible ray VSLED indicator light and/or display screen increases, further brightness increase degree and ρ-ρ h linear;

Judge as ρ≤ρ l, the brightness of visible ray VSLED indicator light and/or display screen reduces, further brightness reduce degree and ρ l-ρ linear;

IV, return step 1 to circulate.

Further improvement as to the iris recognition image acquiring method for mobile terminal of the present invention: the processor chips of described integrated security feature are according to iris image, FEEDBACK CONTROL iris recognition imaging modules is until gather acquisition high-quality iris image, comprise the automated graphics brilliance control for iris recognition image acquisition, comprise the steps:

The photosignal of the unit picture element brightness value Yraw that a, definition iris image are original;

Yraw＝C*T*GAIN*I* (1/F) ²；

T is the image imaging sensor impulse radiation/exposure cycle synchronous with near-infrared LED lighting source and/or synchronous continuous radiation/exposure cycle;

F is the constant of optical imaging lens fixed aperture or relative aperture inverse;

I is near-infrared LED lighting source radiation intensity;

GAIN is simulation and/or the digital gain of image imaging sensor;

C is iris recognition imaging modules fixed light transform electrical signals rate constant;

The defeated exposure cycle T of described synchronous image imaging sensor and near-infrared LED lighting source radiation period T meets: 3.33ms millisecond≤T≤33.33ms millisecond;

Described near-infrared LED lighting source radiation intensity I≤100mW/sr;

The image imaging sensor signal to noise ratio snr >=36db of the maximum generation of described analog-and digital-gain G AIN;

Described F=EFL/D meets:

0.5*SOP/(1.22*λ)≤F≤2.0*SOP/(1.22*λ)，

Described D is the pupil of optical imaging lens or the diameter of clear aperature, and EFL is the equivalent focal length value of optical imaging lens, and SOP is the physical size of image imaging sensor unit picture element, and λ is near-infrared LED lighting source peak wavelength;

B, definition iris image area pixel brightness statistics assessed value Ysp;

Described Ysp=S (Yraw); Described S (Yraw) is iris image area pixel brightness statistics valuation functions, and the method that described pixel intensity statistical estimation function adopts comprises pixel intensity statistics with histogram, pixel intensity frequency spectrum statistics, pixel intensity mean value, pixel intensity weighted average or pixel intensity intermediate value etc.;

C, to be realized [Yll, Yhl] brightness range that iris image area pixel brightness statistics assessed value Ysp presetting by photosignal FEEDBACK CONTROL;

The described photosignal FEEDBACK CONTROL by T, I and GAIN, [Yll, Yhl] brightness range that iris image area pixel brightness statistics assessed value Ysp presets is: Yll≤Ysp≤Yhl; Described Yll is iris image area pixel brightness lower limit, and Yhl is the iris image area pixel brightness upper limit; Described Photoelectric Signal Processing is feedback controlled to according to the linear product control planning of the formula in step 1, FEEDBACK CONTROL changes photosignal, realize original unit picture element brightness value Yraw to change, make corresponding iris image area pixel brightness statistics assessed value Ysp meet the pre-conditioned of Yll≤Ysp≤Yhl.

Sum up foregoing description, of the present inventionly achieve following mobile terminal use scenes desired impact:

1, for the iris recognition imaging modules of mobile terminal, its fixing fabric structure is in 8mm*8mm*6mm.

2, for mobile terminal iris recognition imaging modules, meet when identifying works in power consumption control 300mW, when not working in power consumption control 1mW.

3, for the iris recognition image acquiring method of mobile terminal, meet and completed high-quality iris image acquisition within 1 second time.

4, for mobile terminal iris recognition imaging modules, each part and parameter optimised combination configuration.

5, the iris recognition imaging modules for mobile terminal greatly reduces costs, within cost is reduced to 10 U.S. dollars.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.

Fig. 1 is the specific embodiment of the invention 1 iris recognition imaging modules overall construction drawing;

Fig. 2 is the specific embodiment of the invention 1 iris recognition imaging modules optical component structure figure.

Embodiment

Embodiment 1, Fig. 1 give a kind of iris recognition imaging modules overall construction drawing for mobile terminal, comprise setting iris recognition imaging modules optics 1 on mobile terminals, near-infrared LED lighting source 3L, 3R and iris recognition imaging modules connecting line 4; Mobile terminal comprises Mobile terminal main board 10, near-infrared LED current driver 2, the processor chips 5 of integrated security feature, the internal memory 6 of safe read-write access function, the memory 7 of safe read-write access function, power management 8, display screen 100 and radio base band module 9.

The processor chips 5 of integrated security feature configure monokaryon or the polycaryon processor chip of the integrated security feature of ARM CORTEX-A series of TrustZone Secure isolation pattern, and its TrustZone Secure isolation pattern is used in the whole process of iris recognition.

The memory 7 of the processor chips 5 of above Mobile terminal main board 10, near-infrared LED current driver 2, integrated security feature, the internal memory 6 of safe read-write access function, safe read-write access function, power management 8 and radio base band module 9, parts such as display screen 100 grade all can be chosen by commercial product and by function of the present invention and object requirement Combination Design.

The processor chips 5 of Secure isolation Mode A RM CORTEX-A integrated security feature of Mobile terminal main board 10 integrated configuration TrustZone are (for performing all FEEDBACK CONTROL, the safety compute of iris recognition code and iris templates and safe storage, PKI encryption and digital signature), near-infrared LED current driver 2 (for drived control near-infrared LED lighting source electric current), the internal memory 6 (processor chips 5 for integrated security feature perform the safety compute of iris recognition code and iris templates) of safe read-write access function, the memory 7 (processor chips 5 for safety function perform the safe storage of iris recognition code and iris templates) of safe read-write access function, PMIC power management 8 (provide and all component power of Mobile terminal main board 10 and iris recognition imaging modules optics 1 are powered) and radio base band module 9 (for wireless communication applications), display screen 100 (for displays image information), be interconnected by each funtion part, Mobile terminal main board 10 realizes FEEDBACK CONTROL to iris recognition imaging modules of the present invention and image acquiring method.

The internal memory 6 of safe read-write access function and the memory 7 of safe read-write access function are for guaranteeing that the processor chips 5 of the Secure isolation Mode A RM CORTEX-A integrated security feature being only configured TrustZone in mobile terminal authentication process authorize read and write access authority, safe and reliable completely to realize verification process, not by external attack.

In mobile terminal authentication process, the processor chips 5 of integrated security feature are by performing PKI encryption and Digital Signature Algorithm (as AES, 3DES, IDEA; RSA; ECC, MD5, SHA etc.) protection iris recognition code and iris templates and iris recognition result.For improving the security reliability of verification process further, not by external attack.

Be connected by the mutual signal of iris recognition imaging modules connecting line 4 between Mobile terminal main board 10 with iris recognition imaging modules; Realization comprises digital core voltage VDD, analog voltage AVDD, IO voltage IOVDD, master clock input MCLK, pixel clock exports PCLK, MIPI or parallel interface data and synchronizing signal outputs, Shutdown is shut down in I2C communication, low-power consumption or standby standby mode signal (also can software simulating), FLASH synchronizing signal, near-infrared LED lighting source 3L, 3R drive current, further visible ray guides the signal controlling such as the drive current of indicator light 3VS.

The signal of the processor chips 5 of integrated security feature is interconnected with near-infrared LED current driver 2 and connecting line 4 respectively and realizes iris recognition imaging modules FEEDBACK CONTROL; Near-infrared LED current driver 2 controls to drive near-infrared LED lighting source 3L, the radiation intensity of 3R and radiation period further.Further, near-infrared LED current driver 2 also controls to drive visible ray to guide radiation intensity and the radiation period of indicator light 3VS.

As embodiment 1 adopts commercial product LED current driver Maxim MAX8834Y/MAX8834Z, it provides 2 road big current Flash/Movie mode activated near-infrared LED lighting source 3L and 3R that can independently control, and a LED and road small area analysis LED Indicator drives visible ray to guide indicator light 3VS.

Synchronous pulse period radiation and consecutive periods radiation mode is configured by function of the present invention and object Combination Design Flash and Movie pattern.

Iris recognition imaging modules described in embodiment 1 is made up of near-infrared LED lighting source and iris recognition imaging modules optics;

As shown in Figure 2, the concrete structure of iris recognition imaging modules optics 1 comprises and forming with lower part: the optical imaging lens 12 of preposition near infrared light optical light filter 11, fixed focal length, the fixed mounting 13 of optical imaging lens, rearmounted near infrared light optical light filter 14, image imaging sensor 15 and iris recognition imaging modules substrate 16.Iris recognition imaging modules substrate 16 sets gradually from bottom to up image imaging sensor 15, rearmounted near infrared light optical light filter 14, the fixed mounting 13 of optical imaging lens, the optical imaging lens 12 of fixed focal length and preposition near infrared light optical light filter 11.Iris recognition imaging modules substrate 16 is that printed substrate, flexible circuit board or Rigid Flex are formed, for providing the fixed structure carrier of iris recognition imaging modules optics 1 integral installation.The fixed mounting 13 of optical imaging lens is for installing the optical imaging lens 12 of fixed focal length.Iris recognition imaging modules optics 1 for contactless physics imaging to gather iris image.

Near-infrared LED lighting source (3L, 3R) near infrared light of radiation carry out absorbing at object space iris, scattering, reflection optical bio effect after, enter preposition near infrared light optical light filter 11 and/or rearmounted near infrared light optical light filter 14 carries out the filtration of non-imaged stray light, the imaging wavelength light after filtration enters the optical imaging lens 12 of fixed focal length; The optical imaging lens 12 of fixed focal length is automatic focus AF optical imaging lens or fixed-focus optical imaging lens, the image imaging sensor 15 being positioned at image space is focused on for realizing contactless optical physics, image imaging sensor 15 makes the image light signals converted image signal of telecommunication export, last iris recognition imaging modules connects Mobile terminal main board 10 by connecting line 4, realizes the processor chips 5 FEEDBACK CONTROL iris recognition imaging modules of the present invention by integrated security feature.

Each optics that the mobile terminal component design manufacturing process of Present Attitude maturation can realize in iris recognition imaging modules optics 1 is microminiaturized, and the common standard sizes that COB or CSP packaging technology iris recognition imaging modules can meet mobile terminal 8mm*8mm*6mm is completely manufactured in this professional skill field design of employing maturation.

Iris recognition imaging modules optics 1 described in the embodiment of the present invention 1 adopts toughened glass or sapphire glass outer surface protecting window, adopts the coating for surface protection that anti-foreign matter is polluted.Adapt to various prejudicial use scenes scratch as avoided, striking mark, fingerprint, the pollutions such as impurity.

Near-infrared LED lighting source (3L, 3R) described in the embodiment of the present invention 1 encapsulates for surface patch SMD, and its volume is less than 3mm*3mm*3mm.

Image imaging sensor 15 and near-infrared LED lighting source (3L, 3R) be combined and be configured to: near-infrared LED lighting source (3L, 3R) and the synchronous pulse period radiation/exposure (integration) of image imaging sensor 15 and/or synchronous consecutive periods radiation/exposure (integration).Near-infrared LED lighting source (3L, 3R) synchronous with the pulse period of image imaging sensor 15 image light (integration) and/or near-infrared LED lighting source (3L, 3R) radiation and image imaging sensor 15 exposed frame (integration) the consecutive periods of radiation is synchronous.Lay special stress on synchronous consecutive periods radiation/exposure method is the special case of clock cycle of the present invention radiation/exposure method, and the radiation when its pulse period is 100% duty cycle and exposure equal consecutive periods radiation and exposure.Described radiation/exposure (integration) cycle T is configured to: 3.33ms millisecond≤T≤33.33ms millisecond; Near-infrared LED lighting source (3L, 3R) radiation intensity I is configured to: I≤100mW/sr (the every surface of sphere of milliwatt); Image imaging sensor 15 reads frame rate R and is configured to: R >=30fps frame is per second.

Guide instruction configuration the embodiment of the present invention 1 is for using iris recognition imaging modules during user: near-infrared optical filter reflection visible ray carries out the guiding instruction that minute surface visual feedback and visible ray guide indicator light to be formed, and/or display screen is shown as the guiding instruction that picture image feedback formed.

Image imaging sensor 15 described in the embodiment of the present invention 1 is configured to RAW RGB Bayer pixel output format, uses RGB channel gain to compensate or RGB channel gain balance.

$G={\∫}_{\mathrm{\λ}-\mathrm{\Δ\λ}}^{\mathrm{\λ}+\mathrm{\Δ\λ}}g\left(\mathrm{\λ}\right)f\left(\mathrm{\λ}\right)\mathrm{d\λ}$

$R={\∫}_{\mathrm{\λ}-\mathrm{\Δ\λ}}^{\mathrm{\λ}+\mathrm{\Δ\λ}}r\left(\mathrm{\λ}\right)f\left(\mathrm{\λ}\right)\mathrm{d\λ}$

$B={\∫}_{\mathrm{\λ}-\mathrm{\Δ\λ}}^{\mathrm{\λ}+\mathrm{\Δ\λ}}b\left(\mathrm{\λ}\right)f\left(\mathrm{\λ}\right)\mathrm{d\λ}$

With G channel compensation or balancing gain for standardizing standard, G_CGC=1.0; R channel compensation or balancing gain R_CGC=G/R; Channel B compensates or balancing gain B_CGC=G/B; Described λ is near-infrared LED lighting source peak wavelength, Δ λ is near-infrared LED lighting source peak wavelength half-peak band width FWHM, g (λ), r (λ), b (λ) is respectively photoelectricity conversion quantum efficiency or the spectrum sensitivity function of image imaging sensor RGB passage, and f (λ) is Wavelength distribution function.

During general pattern imaging sensor employing color-type, because it can greatly be reduced costs by a large amount of commercial production manufactures.

As embodiment 1 adopts commercial product OmniVision OV4688, Aptina AR0330 cost is lower than 5 U.S. dollars.But because its RGB passage of its near-infrared wavelength for imaging of color-type image imaging sensor has different photoelectricity conversion quantum efficiencies or spectrum sensitivity, therefore for compensating or balancing inconsistent, make it reach the identical compensation of RGB channel gain or the RGB channel gain of unanimously must using of RGB passage and balance.Equivalent to understand, also can of equal valuely to adopt to compensate with R channel gain or channel B gain compensation for for normalizing standard.During special image imaging sensor employing monochrome type, RGB channel gain compensation or RGB channel gain balance can be reduced to G_CGC=R_CGC=B_CGC=1.0; Further when using image imaging sensor to adopt color-type, forbidding color matrices corrects CCM, forbidding pixel interpolating PI (pixel interpolation), forbidding Gamma corrects, forbidding Automatic white balance AWB, use these functions to cause iris image contrast to reduce, special texture high frequency edge part, affects iris image quality.Further image imaging sensor is configured to have optical black level and corrects BLC (Black Level Correction), noise compensation NC (Noise Correction).Further the simulation of image imaging sensor 15 and/or the maximum of digital gain GAIN are configured to: image imaging sensor signal to noise ratio snr >=36db that GAIN maximum produces; The image resolution ratio ROI of described image imaging sensor 15 is configured to: ROI >=1920pixels*1080pixels.Equivalent understanding, under the same conditions, the image resolution ratio ROI of image imaging sensor is higher, and its areas imaging of iris recognition imaging modules is larger, and user's scope of application is larger, is easier to use.Near infrared light optical light filter (11,14) with near-infrared LED lighting source (3L, 3R), optical imaging lens 12 is configured to: near infrared light optical light filter (11,14) central peak wavelength equals the central peak wavelength of near-infrared LED lighting source (3L, 3R) and the center chromatic aberration correction wavelength of optical imaging lens 12; Near infrared light optical light filter (11,14) half peak transmission wavelength bandwidth FWHM effectively mates or covers half peak emission wavelength bandwidth FWHM of near-infrared LED lighting source (3L, 3R) and the chromatic aberration correction wave-length coverage of optical imaging lens 12.

Near-infrared LED lighting source (3L, 3R) central peak wave-length coverage 750-880nm described in the embodiment of the present invention 1, half-peak band width FWHM is 10-60nm; The central peak wave-length coverage 750-880nm of described preposition near infrared light optical light filter 11 and/or rearmounted near infrared light optical light filter 14, FWHM is 10-60nm; The chromatic aberration correction wave-length coverage 750-880nm of described optical imaging lens 12; Described preposition and/or rearmounted near infrared light optical light filter (11,14) is used for the near infrared light of imaging wavelength for reflect visible light and transmission.Described preposition and/or rearmounted near infrared light optical light filter (11,14) is absorb the near infrared light that visible ray and transmission be used for imaging wavelength.Described preposition and/or rearmounted near infrared light optical light filter (11,14) is any one in the logical near infrared light optical light filter of narrowband NIR optical light filter or band; Preposition near infrared light optical light filter 11 and/or rearmounted near infrared light optical light filter 14 adopt optical clear glass, as BK7 or the optical material such as coloured glass or optical plastic carry out surface multi-layer plated film, current coating process and technology can realize background depth cutoff rate or signal to noise ratio snr (SNR:signal-to-noise ratio) >=60dB (1000:1).Preposition near infrared light optical light filter 11 and/or rearmounted near infrared light optical light filter 14 filter the wavelength being used for imaging, the signal to noise ratio snr (SNR:signal-to-noise ratio) of the ambient interferences stray light of imaging wavelength and non-imaged are met: >=60dB (1000:1).Equivalent understanding, preposition near infrared light optical light filter 11 and/or rearmounted near infrared light optical light filter 14 also can of equal valuely adopt carry out multicoating on optical imaging lens 12 surface.

Half peak transmission wavelength bandwidth FWHM of preposition near infrared light optical light filter 11 and/or rearmounted near infrared light optical light filter 14 effectively mates or covers near-infrared LED lighting source (3L, half peak emission wavelength bandwidth FWHM 3R) and the chromatic aberration correction wave-length coverage of optical imaging lens 12, design like this can obtain imaging wavelength utilance to greatest extent, the high-quality iris image of imaging.

During as embodiment 1 image imaging sensor employing color-type, described near-infrared LED lighting source (3L, 3R) central peak wavelength is 850nm, and half-peak band width FWHM is 10-60nm; The central peak wavelength of described preposition near infrared light optical light filter 11 and/or rearmounted near infrared light optical light filter 14 is 850nm, FWHM is 10-60nm; The chromatic aberration correction wave-length coverage 750-880nm of described optical imaging lens 12.

Optical distortion DOL (the distortion of lens) absolute value of the optical imaging lens 12 described in the embodiment of the present invention 1 is configured to: DOL absolute value≤1%; The EFL equivalent focal length value of described optical imaging lens 12 is configured to: SOP*1000pixel≤EFL≤3*SOP*1000pixel; Described SOP is the physical size of image imaging sensor 15 unit picture element, unit um/pixel; Described pixel is pixel unit; The relative Coefficient of Utilitization IOR of described optical imaging lens 12 is configured to: IOR >=50%; Described IOR is the central vision brightness of the peripheral field brightness/optical imaging lens of optical imaging lens 12.The fixed constant aperture of described optical imaging lens 12 or relative aperture F reciprocal are configured to: F=EFL/D, 0.5*SOP/ (1.22* λ)≤F≤2.0*SOP/ (1.22* λ), described D is the pupil of optical imaging lens 12 or the diameter of clear aperature, EFL is the equivalent focal length value of optical imaging lens 12, SOP is the physical size of image imaging sensor 15 unit picture element, λ is near-infrared LED lighting source (3L, 3R) peak wavelength.Described optical imaging lens 12 adopts plastic aspherical element optical mirror slip injection molding process, adopts the whole aberration of 3-5P lenses which correct.Plastic aspherical element optical mirror slip injection molding process produce in enormous quantities manufacture time cost lower than 2 U.S. dollars.

Optical imaging lens 12 described in the embodiment of the present invention 1 adopts the anti-reflection or anti-reflection plated film of near infrared light.Near-infrared LED lighting source (3L described in the embodiment of the present invention 1,3R) and optical imaging lens 12 be combined with image imaging sensor 15 and be configured to: near-infrared LED lighting source (3L, brightness half peak value radiation angle (or angle of divergence) AOR 3R) is more than or equal to the angle of visual field FOV of optical imaging lens 12, and the angle of visual field FOV of described optical imaging lens 12 is more than or equal to the image planes physical size SOI of image imaging sensor 15; The image planes physical size SOI of described image imaging sensor 15 is configured to: SOI=DOI*SOP; Described DOI is the image planes diagonal pixels quantity of image imaging sensor 15; SOP is the physical size of image imaging sensor 15 unit picture element; The angle of visual field FOV of described optical imaging lens 12 is configured to: FOV >=2*arctan ((SOI)/(2*EFL)); EFL is the equivalent focal length value of optical imaging lens 12.Described near-infrared LED lighting source (3L, 3R) brightness half peak value radiation angle (or angle of divergence) AOR is configured to: AOR >=FOV; Described FOV is the angle of visual field of optical imaging lens 12.

Image imaging sensor 15 described in the embodiment of the present invention 1 and optical imaging lens 12 are combined and are configured to: the chief ray incidence angles CRA (Chief Ray Angle) mutually mated >=20 degree.Described mutual coupling is the chief ray incidence angles CRA being less than or equal to image imaging sensor at the chief ray incidence angles CRA of the middle optical imaging lens of passage of light (visual field).Adopt the optical design software such as ZEMAX, CODEV board design can reach the chief ray incidence angles of above-mentioned mutual coupling.Being combined with the chief ray incidence angles CRA of optical imaging lens 12 of image imaging sensor 15 of mutually mating as embodiment 1 is configured to 25-35 degree, and image imaging sensor 15 chief ray incidence angles CRA is identical with the chief ray incidence angles CRA of optical imaging lens 12.Equivalent understanding, under the same conditions, the chief ray incidence angles CRA of image imaging sensor is larger, and the optics overall length TTL of optical imaging lens can shorten further, and iris recognition imaging modules thickness is thinner, more can meet mobile terminal standard 6mm requirement.Equivalent understanding, under the same conditions, the chief ray incidence angles CRA of image imaging sensor is larger, and the equivalent focal length EFL of optical imaging lens is larger, and iris recognition imaging modules has larger operating distance.

Efficiency configure inductor described in the embodiment of the present invention 1 to be used to indicate when user uses the prompting of distance information, and user exceed distance near limit as within 10cm time, close near-infrared LED lighting source and avoid excessive radiation of light source.Configuration surroundings visible ray inductor is used for the brightness according to current environment visible ray brightness corresponding change visible ray indicator light and/or display screen.

Above content describes the embodiment of the present invention 1 for the concrete constitute and function of iris recognition imaging modules of mobile terminal and configuration, in order to realize obtaining high-quality iris image, the embodiment of the present invention 1 also comprises a kind of image acquiring method of the iris recognition for mobile terminal:

Comprise the following steps:

1. iris recognition imaging modules initial configuration.

2. near-infrared LED current driver 2 and image imaging sensor 15 enter the low-power consumption mode of shutdown Shutdown or standby standby, to save most power consumption.

3. the processor chips 5 of integrated security feature detect the need of acquisition iris image, are go to step 4, no continuation step 3.

4. near-infrared LED current driver 2 and image imaging sensor 15 proceed to normal mode of operation from shutdown Shutdown or standby standby low-power consumption mode, and near-infrared LED lighting source (3L, 3R) opened by near-infrared LED current driver 2.

5. image imaging sensor 15 export with the synchronous pulse period radiation/exposure (integration) of near-infrared LED lighting source (3L, 3R) and/or synchronous consecutive periods radiation/exposure (integration) after view data.

6. the processor chips 5 of integrated security feature are according to iris image, and FEEDBACK CONTROL iris recognition imaging modules is until gather acquisition high-quality iris image.

7. terminate to obtain iris image, return step 2 and circulate.

The iris recognition image acquiring method for mobile terminal described in the embodiment of the present invention 1 meets and to comprise near-infrared LED lighting source power consumption when identifying works within power consumption control 300mW and be less than 100mW and add image imaging sensor power consumption and be less than 100mW, the low-power consumption mode power consumption control of shutdown Shutdown or standby standby is less than in 1mW, and meets completed high-quality iris image acquisition by FEEDBACK CONTROL within 1 second time.

Iris recognition imaging modules initial configuration comprises the following steps:

1. near-infrared LED current driver reset reset, image imaging sensor reset reset.

2. near-infrared LED current driver pattern is configured synchronous pulse period radiation and/or consecutive periods radiation mode.

3. image imaging sensor configuration MIPI or parallel interface, data output bit width 8,10,12bit, image imaging sensor configurable clock generator PLL and frame read-out speed R, image imaging sensor configuration image resolution ROI.

4. image imaging sensor configuration RAW RGB Bayer pixel output format, the configuration RGB channel compensation gain of image imaging sensor or the gain of RGB channel balance, image imaging sensor configuration simulation and/or digital gain GAIN.

5. the image imaging sensor configuration pulse period synchronous with near-infrared LED lighting source radiation mode exposes (integration) and/or synchronous consecutive periods exposes (integration) pattern.

The processor chips of integrated security feature are according to iris image, and FEEDBACK CONTROL iris recognition imaging modules is until gather acquisition high-quality iris image, and the near-infrared LED lighting source comprised for iris recognition image acquisition controls, and comprises the following steps:

1. the processor chips of integrated security feature obtain illuminance distribution and the mirror-reflection annoyance level of iris image light source irradiation according to iris image.

2. judge whether present intensity distributing homogeneity and mirror-reflection annoyance level meet iris image quality, are go to step 1, noly go to step 3.

3. select to switch bilateral or left and right either side near-infrared LED lighting source.

4. return step 1 to circulate.

The processor chips of integrated security feature are according to iris image, and FEEDBACK CONTROL iris recognition imaging modules is until gather acquisition high-quality iris image, and the guiding instruction comprised for iris recognition image acquisition controls, and comprises the following steps:

1. judge to guide indicating mode.

2., when guiding is designated as minute surface visual feedback, show state prompting visible ray VSLED guides indicator light, and indicating user uses OK range, and instruction recognition failures, instruction identifies successfully.

3. be shown as picture image feedback when guiding is designated as display screen.Indicating user uses OK range on a display screen, and instruction recognition failures, instruction identifies successfully.

4. return step 1 to circulate.

The processor chips of integrated security feature are according to iris image, FEEDBACK CONTROL iris recognition imaging modules is until gather acquisition high-quality iris image, comprise the brilliance control of visible ray VSLED indicator light for iris recognition image acquisition and/or display screen, comprise the following steps:

1. the processor chips of integrated security feature obtain pupil and iris natural scale value ρ according to iris image.

2. judging current pupil and iris natural scale value whether in predetermined bound [ρ h, ρ l] scope, is go to step 1, noly goes to step 3.

3. judge as ρ >=ρ h, the brightness of visible ray VSLED indicator light and/or display screen increases, further brightness increase degree and ρ-ρ h linear; Judge as ρ≤ρ l, the brightness of visible ray VSLED indicator light and/or display screen reduces, further brightness reduce degree and ρ l-ρ linear.

4. return step 1 to circulate.

The processor chips of integrated security feature are according to iris image, and FEEDBACK CONTROL iris recognition imaging modules, until gather acquisition high-quality iris image, comprises the automated graphics brilliance control for iris recognition image acquisition: comprise the steps:

1, the photosignal of the original unit picture element brightness value Yraw of iris image is defined;

Yraw＝C*T*GAIN*I* (1/F) ²；

T is image imaging sensor impulse radiation/exposure (integration) cycle synchronous with near-infrared LED lighting source and/or synchronous continuous radiation/exposure (integration) cycle;

F is the constant of optical imaging lens fixed aperture or relative aperture inverse;

I is near-infrared LED lighting source radiation intensity;

GAIN is simulation and/or the digital gain of image imaging sensor;

C is iris recognition imaging modules fixed light transform electrical signals rate constant;

The defeated exposure cycle T of described synchronous image imaging sensor and near-infrared LED lighting source radiation period T meets: 3.33ms millisecond≤T≤33.33ms millisecond;

Described near-infrared LED lighting source radiation intensity I≤100mW/sr;

The image imaging sensor signal to noise ratio snr >=36db of the maximum generation of described simulation and/or digital gain GAIN;

Described F meets: F=EFL/D is: 0.5*SOP/ (1.22* λ)≤F≤2.0*SOP/ (1.22* λ),

Described D is the pupil of optical imaging lens or the diameter of clear aperature, and EFL is the equivalent focal length value of optical imaging lens, and SOP is the physical size of image imaging sensor unit picture element, and λ is near-infrared LED lighting source peak wavelength.

2, iris image area pixel brightness statistics assessed value Ysp is defined;

Described Ysp=S (Yraw); Described S (Yraw) is iris image area pixel brightness statistics valuation functions, and the method that described pixel intensity statistical estimation function adopts comprises pixel intensity statistics with histogram, pixel intensity frequency spectrum statistics, pixel intensity mean value, pixel intensity weighted average or pixel intensity intermediate value etc.

3, iris image area pixel brightness statistics assessed value Ysp is realized in default [Yll, Yhl] brightness range by photosignal FEEDBACK CONTROL;

The described photosignal FEEDBACK CONTROL by T, I and GAIN, [Yll, Yhl] brightness range that iris image area pixel brightness statistics assessed value Ysp presets is: Yll≤Ysp≤Yhl; Described Yll is iris image area pixel brightness lower limit, and Yhl is the iris image area pixel brightness upper limit; Described Photoelectric Signal Processing controls to be according to the linear product control planning of the formula in step 1, FEEDBACK CONTROL changes photosignal, realize original unit picture element brightness value Yraw to change, make corresponding iris image area pixel brightness statistics assessed value Ysp meet the pre-conditioned of Yll≤Ysp≤Yhl.

The specific embodiment content that the present invention describes and technical characteristic, can be implemented in the scope of identical or equivalent understanding, and as image imaging sensor type, optical imaging lens type, light chopper, device substitutes also should by equivalent understanding.

Finally, it is also to be noted that what enumerate above is only several specific embodiments of the present invention.Obviously, the invention is not restricted to above embodiment, many distortion can also be had.All distortion that those of ordinary skill in the art can directly derive from content disclosed by the invention or associate, all should think protection scope of the present invention.

Claims (12)

1., for an iris recognition imaging modules for mobile terminal, comprise setting iris recognition imaging modules on mobile terminals; This mobile terminal comprises Mobile terminal main board, the processor chips of integrated security feature, near-infrared LED current driver driver, the internal memory of safe read-write access function, the memory of safe read-write access function, power management module and display screen; It is characterized in that: described processor chips are for performing PKI encryption and Digital Signature Algorithm protects iris recognition code and iris templates and iris recognition result; Described processor chips are also connected with internal memory and memory respectively, complete the safety compute performing iris recognition code and iris templates and the safe storage function performing iris recognition code and iris templates;

Described iris recognition imaging modules is made up of near-infrared LED lighting source and iris recognition imaging modules optics;

Described iris recognition imaging modules optics comprises and carries out the preposition of imaging wavelength filtration and/or rearmounted near infrared light optical light filter, the optical imaging lens that imaging wavelength light after near-infrared optical filter filters is focused on, the image imaging sensor to the imaging wavelength image formation by rays focused on by optical imaging lens, and the image of image imaging sensor is carried out the connecting line of Signal transmissions;

Described processor chips are interconnected by connecting line with near-infrared LED current driver and iris recognition imaging modules respectively and realize FEEDBACK CONTROL;

The near-infrared LED lighting source radiation intensity of described near-infrared LED current driver drived control iris recognition imaging modules and radiation period.

2. the iris recognition imaging modules for mobile terminal according to claim 1, is characterized in that: described image imaging sensor and near-infrared LED lighting source be combined configure as follows:

Near-infrared LED lighting source and image imaging sensor realize synchronous pulse period radiation/exposure mode and/or synchronous consecutive periods radiation/exposure mode;

Described near infrared light optical light filter and near-infrared LED lighting source and optical imaging lens combine and are configured as follows:

The central peak wavelength of near infrared light optical light filter equals the central peak wavelength of near-infrared LED lighting source and the center chromatic aberration correction wavelength of optical imaging lens; Half peak transmission wavelength bandwidth FWHM of near infrared light optical light filter effectively mates or covers half peak emission wavelength bandwidth FWHM of near-infrared LED lighting source and the chromatic aberration correction wave-length coverage of optical imaging lens;

Described image imaging sensor and optical imaging lens be combined configuration as follows:

Chief ray incidence angles CRA >=20 degree of mutual coupling;

Described near-infrared LED lighting source and optical imaging lens and image imaging sensor be combined configure as follows:

The brightness half peak value radiation angle of near-infrared LED lighting source is more than or equal to the angle of visual field of optical imaging lens, and the angle of visual field of optical imaging lens is more than or equal to the image planes physical size of image imaging sensor.

3. the iris recognition imaging modules for mobile terminal according to claim 2, is characterized in that: the consecutive periods that described near-infrared LED lighting source radiation and/or near-infrared LED lighting source radiation synchronous with the pulse period that image imaging sensor picture frame exposes and image imaging sensor picture frame expose is synchronous;

Described radiation/exposure cycle T is configured to: 3.33ms millisecond≤T≤33.33ms millisecond;

Described near-infrared LED lighting source radiation intensity I is configured to: I≤100mW/sr;

Described image imaging sensor image reads frame rate R and is configured to: R >=30fps frame is per second;

Described near-infrared LED lighting source central peak wave-length coverage 750-880nm, half-peak band width FWHM is 10-60nm;

Described near-infrared optical filter center peak wavelength scope 750-880nm, half-peak band width FWHM is 10-60nm;

The chromatic aberration correction wave-length coverage 750-880nm of described optical imaging lens;

Described near infrared light optical light filter is reflect visible light and the transmission near infrared light for imaging wavelength, or absorbs the near infrared light that visible ray and transmission be used for imaging wavelength;

Described near infrared light optical light filter is any one in narrowband NIR optical light filter or the logical near infrared light optical light filter of band;

The image planes physical size SOI of described image imaging sensor is configured to:

SOI=DOI*SOP; Described DOI is the image planes diagonal pixels quantity of image imaging sensor; SOP is the physical size of image imaging sensor unit picture element;

The angle of visual field FOV of described optical imaging lens is configured to: FOV >=2*arctan ((SOI)/(2*EFL)); EFL is the equivalent focal length value of optical imaging lens;

Described near-infrared LED lighting source brightness half peak value radiation angle AOR is configured to: AOR >=FOV; Described FOV is the angle of visual field of optical imaging lens.

4. the iris recognition imaging modules for mobile terminal according to claim 1, it is characterized in that: described iris recognition imaging modules optics configures the outer surface protecting window be made up of toughened glass or sapphire glass, described outer surface is provided with the coating for surface protection that anti-foreign matter is polluted;

The guiding instruction of described iris recognition imaging modules is configured as follows:

Near-infrared optical filter reflection visible ray carries out minute surface visual feedback and visible ray guides the guiding of indicator light formation to indicate, and/or display screen is shown as the guiding instruction of picture image feedback formation.

5. the iris recognition imaging modules for mobile terminal according to claim 1, is characterized in that:

Described image imaging sensor is configured to RAW RGB Bayer pixel output format, uses RGB channel compensation gain or the gain of RGB channel balance,

$G={\∫}_{\mathrm{\λ}-\mathrm{\Δ\λ}}^{\mathrm{\λ}+\mathrm{\Δ\λ}}g\left(\mathrm{\λ}\right)f\left(\mathrm{\λ}\right)\mathrm{d\λ}$

$R={\∫}_{\mathrm{\λ}-\mathrm{\Δ\λ}}^{\mathrm{\λ}+\mathrm{\Δ\λ}}r\left(\mathrm{\λ}\right)f\left(\mathrm{\λ}\right)\mathrm{d\λ}$

$B={\∫}_{\mathrm{\λ}-\mathrm{\Δ\λ}}^{\mathrm{\λ}+\mathrm{\Δ\λ}}b\left(\mathrm{\λ}\right)f\left(\mathrm{\λ}\right)\mathrm{d\λ}$

With G channel compensation or balancing gain for standardizing standard, G_CGC=1.0;

R channel compensation or balancing gain R_CGC=G/R;

Channel B compensates or balancing gain B_CGC=G/B;

Described λ is near-infrared LED lighting source peak wavelength, Δ λ is near-infrared LED lighting source peak wavelength half-peak band width FWHM, g (λ), r (λ), b (λ) is respectively photoelectricity conversion quantum efficiency or the spectrum sensitivity function of image imaging sensor RGB passage, and f (λ) is Wavelength distribution function;

The simulation of described image imaging sensor and/or the maximum of digital gain GAIN are configured to: image imaging sensor signal to noise ratio snr >=36db that GAIN maximum produces;

The image resolution ratio ROI of described image imaging sensor is configured to: ROI >=1920pixels*1080pixels.

6. the iris recognition imaging modules for mobile terminal according to claim 1, is characterized in that: the optical distortion DOL absolute value of described optical imaging lens is configured to: DOL absolute value≤1%;

The EFL equivalent focal length value of described optical imaging lens is configured to:

SOP*1000pixel≤EFL≤3*SOP*1000pixel；

Described SOP is the physical size of image imaging sensor unit picture element, unit um/pixel;

Described pixel is pixel unit;

The relative Coefficient of Utilitization IOR of described optical imaging lens is configured to: IOR >=50%;

Described IOR is the central vision brightness of the peripheral field brightness/optical imaging lens of optical imaging lens;

The fixed constant aperture of described optical imaging lens or relative aperture F reciprocal are configured to: F=EFL/D;

0.5*SOP/(1.22*λ)≤F≤2.0*SOP/(1.22*λ)；

Described D is the pupil of optical imaging lens or the diameter of clear aperature, and EFL is the equivalent focal length value of optical imaging lens, and SOP is the physical size of image imaging sensor unit picture element, and λ is near-infrared LED lighting source peak wavelength;

Described optical imaging lens adopts plastic aspherical element optical mirror slip injection molding process, adopts the whole aberration of 3-5P lenses which correct.

7. the image acquiring method for the iris recognition of mobile terminal: comprise the following steps:

1. iris recognition imaging modules initial configuration;

2. near-infrared LED current driver and image imaging sensor enter the low-power consumption mode of shutdown Shutdown or standby standby, to save most power consumption;

3. processor chips detect the need of acquisition iris image, are go to step 4, no continuation step 3;

4. near-infrared LED current driver and image imaging sensor proceed to normal mode of operation from shutdown Shutdown or standby standby low-power consumption mode, and near-infrared LED lighting source opened by near-infrared LED current driver;

5. image imaging sensor exports the view data after pulse period radiation/exposure synchronous with near-infrared LED lighting source and/or the radiation/exposure of synchronous consecutive periods;

6. processor chips are according to iris image, and FEEDBACK CONTROL iris recognition imaging modules is until gather acquisition high-quality iris image;

7. terminate to obtain iris image, return step 2 and circulate.

8. the iris recognition image acquiring method for mobile terminal according to claim 7, is characterized in that:

Described iris recognition imaging modules initial configuration, comprises the following steps:

(1) near-infrared LED current driver reset reset, image imaging sensor reset reset;

(2) near-infrared LED current driver pattern is configured synchronous pulse period radiation and/or consecutive periods radiation mode;

(3) image imaging sensor configuration MIPI or parallel interface, configuration data carry-out bit width 8/10/12bit, image imaging sensor configurable clock generator PLL and frame read-out speed R, image imaging sensor configuration image resolution ROI;

(4) image imaging sensor configuration RAW RGB Bayer pixel output format, the configuration RGB channel compensation gain of image imaging sensor or the gain of RGB channel balance, image imaging sensor configuration simulation and/or digital gain GAIN;

(5) the image imaging sensor configuration pulse period exposure mode synchronous with near-infrared LED lighting source radiation mode and/or synchronous consecutive periods exposure mode.

9. the iris recognition image acquiring method for mobile terminal according to claim 7, it is characterized in that: described processor chips are according to iris image, FEEDBACK CONTROL iris recognition imaging modules is until gather acquisition high-quality iris image, the near-infrared LED lighting source comprised for iris recognition image acquisition controls, and comprises the following steps:

(i) the processor chips of integrated security feature obtain illuminance distribution and the mirror-reflection annoyance level of iris image light source irradiation according to iris image;

(ii) judge whether present intensity distributing homogeneity and mirror-reflection annoyance level meet iris image quality; Be go to step 1, noly go to step 3;

(iii) select to switch bilateral or left and right either side near-infrared LED lighting source;

(iv) return step 1 to circulate.

10. the iris recognition image acquiring method for mobile terminal according to claim 7, it is characterized in that: described processor chips are according to iris image, FEEDBACK CONTROL iris recognition imaging modules is until gather acquisition high-quality iris image, the guiding instruction comprised for iris recognition image acquisition controls, and comprises the following steps:

I, judgement guide indicating mode to be that minute surface visual feedback or display screen are shown as picture image feedback;

II, be designated as minute surface visual feedback when guiding, show state prompting visible ray VSLED guides indicator light, and indicating user uses OK range, instruction recognition failures, and instruction identifies successfully;

III, when guiding be designated as display screen be shown as picture image feedback, on a display screen indicating user use OK range, instruction recognition failures, instruction identify successfully;

IV, return step 1 and circulate.

The 11. iris recognition image acquiring methods for mobile terminal according to claim 7, it is characterized in that: described processor chips are according to iris image, FEEDBACK CONTROL iris recognition imaging modules is until gather acquisition high-quality iris image, comprise the brilliance control of visible ray VSLED indicator light for iris recognition image acquisition and/or display screen, comprise the following steps:

I, processor chips obtain pupil and iris natural scale value ρ according to iris image;

II, judging current pupil and iris natural scale value whether in predetermined bound [ρ h, ρ l] scope, is go to step 1, noly goes to step 3;

III, judge as ρ >=ρ h, the brightness of visible ray VSLED indicator light and/or display screen increases, further brightness increase degree and ρ-ρ h linear;

Judge as ρ≤ρ l, the brightness of visible ray VSLED indicator light and/or display screen reduces, further brightness reduce degree and ρ l-ρ linear;

IV, return step 1 to circulate.

The 12. iris recognition image acquiring methods for mobile terminal according to claim 7, it is characterized in that: the processor chips of described integrated security feature are according to iris image, FEEDBACK CONTROL iris recognition imaging modules is until gather acquisition high-quality iris image, comprise the automated graphics brilliance control for iris recognition image acquisition, comprise the steps:

The photosignal of the unit picture element brightness value Yraw that a, definition iris image are original;

Yraw＝C*T*GAIN*I*(1/F) ²；

T is the image imaging sensor impulse radiation/exposure cycle synchronous with near-infrared LED lighting source and/or synchronous continuous radiation/exposure cycle;

F is the constant of optical imaging lens fixed aperture or relative aperture inverse;

I is near-infrared LED lighting source radiation intensity;

GAIN is simulation and/or the digital gain of image imaging sensor;

C is iris recognition imaging modules fixed light transform electrical signals rate constant;

The defeated exposure cycle T of described synchronous image imaging sensor and near-infrared LED lighting source radiation period T meets: 3.33ms millisecond≤T≤33.33ms millisecond;

Described near-infrared LED lighting source radiation intensity I≤100mW/sr;

The image imaging sensor signal to noise ratio snr >=36db of the maximum generation of described analog-and digital-gain G AIN;

Described F=EFL/D meets:

0.5*SOP/(1.22*λ)≤F≤2.0*SOP/(1.22*λ)，

Described D is the pupil of optical imaging lens or the diameter of clear aperature, and EFL is the equivalent focal length value of optical imaging lens, and SOP is the physical size of image imaging sensor unit picture element, and λ is near-infrared LED lighting source peak wavelength;

B, definition iris image area pixel brightness statistics assessed value Ysp;

Described Ysp=S (Yraw); Described S (Yraw) is iris image area pixel brightness statistics valuation functions, and the method that described pixel intensity statistical estimation function adopts comprises pixel intensity statistics with histogram, pixel intensity frequency spectrum statistics, pixel intensity mean value, pixel intensity weighted average or pixel intensity intermediate value etc.;

C, to be realized [Yll, Yhl] brightness range that iris image area pixel brightness statistics assessed value Ysp presetting by photosignal FEEDBACK CONTROL;

The described photosignal FEEDBACK CONTROL by T, I and GAIN, [Yll, Yhl] brightness range that iris image area pixel brightness statistics assessed value Ysp presets is: Yll≤Ysp≤Yhl; Described Yll is iris image area pixel brightness lower limit, and Yhl is the iris image area pixel brightness upper limit; Described Photoelectric Signal Processing is feedback controlled to according to the linear product control planning of the formula in step 1, FEEDBACK CONTROL changes photosignal, realize original unit picture element brightness value Yraw to change, make corresponding iris image area pixel brightness statistics assessed value Ysp meet the pre-conditioned of Yll≤Ysp≤Yhl.