CN103870819B - The iris recognition optical imagery module of mobile terminal safety authentication and make usage - Google Patents
The iris recognition optical imagery module of mobile terminal safety authentication and make usage Download PDFInfo
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Abstract
The invention discloses a kind of iris recognition optical imagery module for mobile terminal safety authentication, comprise near-infrared LED lighting source (1L, 1R), the optical imaging lens (5) of fixed focal length, rear burnt near infrared light optical light filter (6), image imaging sensor (7), safety chip (9) etc.; The maximum radiation intensity I short cycle T sequential that near-infrared LED lighting source (1L, 1R) produces equals the cycle sequential of image imaging sensor (7) frame picture element global trigger exposure; Half peak of radiation of near-infrared LED lighting source (1L, 1R) or dispersion angle FWHM are more than or equal to the imaging viewing field angle FOV of optical imaging lens (5).The present invention also provides simultaneously and utilizes the above-mentioned iris recognition optical imagery module for mobile terminal to carry out the method for safety identification authentication.
Description
Technical field
The present invention relates to a kind of iris recognition optical imagery module for mobile terminal safety authentication and using method thereof, belong to field, Light Electrical.
Background technology
The extensive employing that mobile terminal comprises smart mobile phone, dull and stereotyped MID, portable equipment etc. is the inexorable trend of an Information Technology Development.At present, the mobile terminal in real world applications pays at mobile security, and the practical applications such as account safety logs in, Web bank exist this most important application obstacle of considerable safety authentication.Bio-identification is the very effective method solving mobile terminal safety authentication, and iris authentication system is the most accurate and biological characteristic is the most stable, but is applied to mobile terminal and also there is very large problem:
1, user is normally hand-held, and needs to identify to there is very large uncertain motion blur in mobile advancing.
2, when user identifies, use scenes is unpredictable, and complete darkness 0Lux is to outdoor sun direct projection 100,000Lux likely indoor for its environment for use illuminance.
3, there is the glasses reflection impact identification of wearing in user's vast scale.
4, mobile terminal is battery powered, and it is very high to the light source power consumption requirements of iris recognition imagery optical imaging modules.
5, the miniaturization of iris recognition optical imagery module.
6, a set of safe flow for authenticating ID is needed to realize.
Overcoming the above problems is the ultimate challenge that current technology faces.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of iris recognition optical imagery module for mobile terminal safety authentication and using method thereof.
In order to solve the problems of the technologies described above, the invention provides a kind of iris recognition optical imagery module for mobile terminal safety authentication, comprise near-infrared LED lighting source (1L, 1R), the optical imaging lens of fixed focal length, rear burnt near infrared light optical light filter, image imaging sensor, also comprise:
Configuration safety chip;
Near-infrared LED lighting source (1L, 1R) is configured to:
Be positioned at the left and right sides of imaging optical axis;
LED is SMT encapsulation and by the light of LED current driver (1L ', 1R ') driver output short cycle T maximum radiation intensity I;
Remarks illustrate: described LED belongs to parts in near-infrared LED lighting source (1L, 1R);
Near-infrared LED lighting source (1L, 1R) and image imaging sensor are combined and are configured to:
1). the maximum radiation intensity I short cycle T sequential that near-infrared LED lighting source (1L, 1R) produces equals the cycle sequential of image imaging sensor frame picture element global trigger exposure (integration); Adopt short cycle radiation in 1 second, produce the equivalent radiated power amount of radiation number of times, realize light source low in energy consumption;
2). near-infrared LED lighting source (1L, 1R) adopts and carries out direct illumination and cross-illumination imaging left and right iris with image imaging sensor timesharing cyclic switching;
Remarks illustrate: namely timesharing is formed, left side near-infrared LED lighting source and left side iris direct illumination imaging and with right side iris cross-illumination imaging, and/or, right side near-infrared LED lighting source and left side iris cross-illumination imaging and with right side iris direct illumination imaging, then carry out cyclic switching in order until acquisition high-quality iris image;
Near-infrared LED lighting source (1L, 1R) and optical imaging lens are combined and are configured to:
Half peak of radiation of near-infrared LED lighting source (1L, 1R) or dispersion angle FWHM are more than or equal to the imaging viewing field angle FOV of optical imaging lens;
Remarks illustrate:
Ensure imaging viewing field luminance proportion ρ=Iedge/Icenter*100% >=50%,
Iedge is imaging viewing field edge brightness, and Icenter is imaging viewing field center brightness;
Described imaging viewing field angle FOV is the region of horizontal X axle scope W in imaging viewing field (as described in Figure 1), vertical Y axle scope H;
Near-infrared LED lighting source (1L, 1R) and rear burnt near infrared light optical light filter (6) are combined and are configured to:
Half peak transmission wavelength FWHM of rear burnt near infrared light optical light filter (6) is more than or equal to half peak emission wavelength FWHM of near-infrared LED lighting source (1L, 1R);
Optical imaging lens is configured to: fixed focus lenses, liquid crystal drive lens, VCM voice coil loudspeaker voice coil drive lens, MEMS to drive lens, EDOF phase front coding lens, any one in WLA wafer level lens array.
The present invention also provides the another kind of iris recognition optical imagery module for mobile terminal safety authentication simultaneously, comprise near-infrared LED lighting source (1L, 1R), the optical imaging lens of fixed focal length, rear burnt near infrared light optical light filter, image imaging sensor, also comprise:
Configuration safety chip;
Near-infrared LED lighting source (1L, 1R) is configured to:
Be positioned at the left and right either side of imaging optical axis;
LED is SMT encapsulation and by the light of LED current driver (1L ', 1R ') driver output short cycle T maximum radiation intensity I;
Near-infrared LED lighting source (1L, 1R) and image imaging sensor are combined and are configured to:
1). the maximum radiation intensity I short cycle T sequential that near-infrared LED lighting source (1L, 1R) produces equals the cycle sequential of image imaging sensor frame picture element global trigger exposure; Adopt short cycle radiation in 1 second, produce the equivalent radiated power amount of radiation number of times, realize light source low in energy consumption;
2). near-infrared LED lighting source (1L, 1R) adopts and carries out direct illumination and cross-illumination imaging left and right iris with image imaging sensor;
Near-infrared LED lighting source (1L, 1R) and optical imaging lens are combined and are configured to:
Half peak of radiation of near-infrared LED lighting source (1L, 1R) or dispersion angle FWHM are more than or equal to the imaging viewing field angle FOV of optical imaging lens;
Described imaging viewing field angle FOV is the region of horizontal X axle scope W in imaging viewing field, vertical Y axle scope H;
Near-infrared LED lighting source (1L, 1R) and rear burnt near infrared light optical light filter are combined and are configured to:
Half peak transmission wavelength FWHM of rear burnt near infrared light optical light filter is more than or equal to half peak emission wavelength FWHM of near-infrared LED lighting source (1L, 1R);
Optical imaging lens is configured to: fixed focus lenses, liquid crystal drive lens, VCM voice coil loudspeaker voice coil drive lens, MEMS to drive lens, EDOF phase front coding lens, any one in WLA wafer level lens array.
Remarks illustrate:
Near-infrared LED lighting source (1L, 1R)--left side near-infrared LED lighting source 1L and right side near-infrared LED lighting source 1R is configured to:
Be positioned at the left and right sides or the either side of imaging optical axis (0);
By LED current driver (1L ', 1R ')--the light of left side LED current driver 1L ' and right side LED current driver 1R ' driver output short cycle T maximum radiation intensity I;
Left side LED current driver 1L ' connects the light of left side near-infrared LED lighting source 1L for driving left side LED to export short cycle T maximum radiation intensity I;
Right side LED current driver 1R ' connects the light of right side near-infrared LED lighting source 1R for driving right side LED to export short cycle T maximum radiation intensity I.
Improvement as the iris recognition optical imagery module for mobile terminal safety authentication of the present invention:
Emission angle φ d for the LED illumination light source of direct illumination imaging should meet: 5.7-11.25 degree;
Emission angle φ c for the LED illumination light source of cross-illumination imaging should meet: 11.25-35 degree;
Emission angle φ is defined as the line of near-infrared LED lighting source (1L, 1R) center to iris center, left and right and the angle of imaging optical axis; Described emission angle φ is the general designation of φ d and φ c.
Further improvement as the iris recognition optical imagery module for mobile terminal safety authentication of the present invention:
Described timesharing cyclic switching carries out direct illumination and cross-illumination imaging left and right iris comprises the following steps:
(1) close right side near-infrared LED lighting source 1R, open left side near-infrared LED lighting source 1L;
(2) imaging simultaneously of image imaging sensor exports left side iris direct illumination image Ia and right side iris cross-illumination image Ib;
(3) close left side near-infrared LED lighting source 1L, open right side near-infrared LED lighting source 1R;
(4) imaging simultaneously of image imaging sensor exports right side iris direct illumination image Id and left side iris cross-illumination image Ic;
(5) judge left and right iris image quality, meet quality requirements and close left and right sides near-infrared LED lighting source (1L, 1R), do not meet quality requirements and then return (1) by process order until meet quality requirements.
Remarks illustrate: meet quality requirements and just refer to meet, under the environment for use wearing all kinds of glasses, iris image does not occur mirror-reflection, and the not serious iris image quality that affects is used to identify.Said this professional domain of judgment rule is generally by the specular reflection point of iris region in detected image, and namely the quantity accounting of the pixel value of full scale (maximal value) is added up.
Further improvement as the iris recognition optical imagery module for mobile terminal safety authentication of the present invention:
Described near-infrared LED lighting source (1L, 1R) maximum radiation intensity I (mW/sr, the every sterad of milliwatt) should meet:
I=E*WD
2/ cos
2φ E<10mW/cm
2wD represents the working substance distance of imaging system;
E is defined as the greatest irradiation illumination of the lighting source that working substance accepts apart from WD place, E requires to be less than eyes LED illumination radiation safety international standard (IEC62471:2006Photobiologicalsafetyoflampsandlampsystems) upper limit, this standard limits LED illumination radiation may to retina, the heat radiation bio-safety effect caused of crystalline and cornea;
The short cycle T (ms, millisecond) of the radiation that described near-infrared LED lighting source (1L, 1R) produces should meet:
T≤3.33ms。
Further improvement as the iris recognition optical imagery module for mobile terminal safety authentication of the present invention:
The fixed focal length FEL of described optical imaging lens is configured to:
EFL＝WD*β；
Wherein: WD represents the working substance distance of imaging system;
β is the enlargement ratio of optical imaging system;
β＝SOP*ROP；
SOP is the physical size of image imaging sensor unit picture element;
ROP is iris image pixel resolution.
Further improvement as the iris recognition optical imagery module for mobile terminal safety authentication of the present invention:
The optical space resolution (opticalspatialresolution) of described optical imaging lens is configured to:
Should meet in object space plane: time 60% modulation transfer function (MTF=0.6) >=4 lines are to every millimeter (lp/mm).
Further improvement as the iris recognition optical imagery module for mobile terminal safety authentication of the present invention:
Described iris recognition optical imagery module configuration optical reflector, for vertical transitions light path.
Further improvement as the iris recognition optical imagery module for mobile terminal safety authentication of the present invention:
Described image imaging sensor is configured to: at least HD high definition pixel resolution, 1920 pixel * 1080 pixels.
Further improvement as the iris recognition optical imagery module for mobile terminal safety authentication of the present invention:
Described image imaging sensor is configured to: at least 500 ten thousand pixel resolutions, 2592 pixel * 1944 pixels.
Further improvement as the iris recognition optical imagery module for mobile terminal safety authentication of the present invention:
Described iris recognition optical imagery module configuration using state guides.
Further improvement as the iris recognition optical imagery module for mobile terminal safety authentication of the present invention:
Described using state guides and comprises voice, pilot lamp, liquid crystal display.
Further improvement as the iris recognition optical imagery module for mobile terminal safety authentication of the present invention:
The pupil that described pilot lamp and/or the brightness of liquid crystal display are designed to obtain in real time according to Algorithm of Iris Recognition adjusts than row change tread with iris diameter.
Further improvement as the iris recognition optical imagery module for mobile terminal safety authentication of the present invention:
Described iris recognition optical imagery module configuration transmission protection optical window, the extra-regional color of its optical imagery and outward appearance are designed to the characteristic with obvious visual contrast; The iris recognition optical imaging system that user can stare in transmission protection optical window in use forms the blinkpunkt of direct-view but not looks side ways point.
Further improvement as the iris recognition optical imagery module for mobile terminal safety authentication of the present invention:
Described transmission protection optical window, can be substituted by mobile terminal outside surface, its entirety is covered in intelligent movable mobile phone front surface, and it uses material to comprise PMMA, PC or the tempered glass of high-transmission rate.
The present invention also provides simultaneously and a kind ofly utilizes the above-mentioned iris recognition optical imagery module for mobile terminal to carry out the method for safety identification authentication, comprises the following steps:
1), safety chip connects the digitized iris image obtaining image imaging sensor and export;
2), safety chip carries out Algorithm of Iris Recognition execution extraction iris feature information;
Remarks illustrate: Algorithm of Iris Recognition belongs to known technology; Iris feature information is exactly the data of the difference iris texture that Algorithm of Iris Recognition produces, the different characteristic information that algorithms of different produces;
3), safety chip generates iris feature template by iris feature information;
4), iris feature template adopts cryptography system to be stored in as private key in safety chip, and ensures never be exported and access;
5), the authentication comparison of iris feature template all carries out in safety chip inside, guarantees mobile terminal at the whole process safety of authentication not by external attack.
Sum up foregoing description, the effect achieving following high user's experience degree of the present invention:
1, can identify in the translational speed of user with independently 1 meter (m/s) per second.
2, when user identifies environment for use illuminance be required to meet indoor complete darkness 0Lux to outdoor sun direct projection 100,000Lux.
3, solve the glasses reflection impact identification that vast scale user wears, comprise near-sighted concave mirror, long sight convex lens, contact lenses, polariscope etc.
4, the light source power consumption of iris recognition optical imagery module consumes low.
5, the miniaturization of iris recognition optical imagery module.
6, the flow for authenticating ID of safety.
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 optical imagery module general principles figure.
Fig. 2 is the maximum radiation intensity short cycle sequential of the specific embodiment of the invention 1 Infrared LED illumination light source generation and the cycle sequential schematic diagram of imaging sensor frame picture element global trigger exposure (integration).
Fig. 3 is that the specific embodiment of the invention 1 near-infrared LED lighting source and image imaging sensor timesharing cyclic switching carry out direct illumination and cross-illumination imaging left and right iris schematic diagram.
Fig. 4 is that the specific embodiment of the invention 1 iris recognition optical imagery module is arranged on intelligent movable mobile phone schematic diagram.
Fig. 5 is the iris recognition optical imagery module general principles figure that the specific embodiment of the invention 1 simplifies.
Embodiment
Embodiment 1,
Fig. 1 describes specific embodiment 1 iris recognition optical imagery module general principles, and iris recognition optical imagery module comprises and forming with lower part:
Imaging optical axis 0, left side near-infrared LED lighting source 1L, right side near-infrared LED lighting source 1R; left side LED current driver 1L '; right side LED current driver 1R ', imaging viewing field 2, transmission protection optical window 3; optical reflector 4; the optical imaging lens 5 of fixed focal length, rear burnt near infrared light optical light filter 6, image imaging sensor 7; module sealing shell 8, safety chip 9.
Module sealing shell 8 is overall in being enclosed in module shell for optical imaging system.
Transmission protection optical window 3 also can be substituted by mobile terminal outside surface.
Be specially:
Left side near-infrared LED lighting source 1L, right side near-infrared LED lighting source 1R, be positioned at the left and right sides of imaging optical axis 0, left side LED current driver 1L ' connects the light of left side near-infrared LED lighting source 1L for driving left side LED to export short cycle T maximum radiation intensity I, and right side LED current driver 1R ' connects the light of right side near-infrared LED lighting source 1R for driving right side LED to export short cycle T maximum radiation intensity I.
Safety chip 9 obtains the digitized iris image exported as imaging sensor 7 for connection layout.
Transmission protection optical window 3 is installed in closed die assembly housing 8 successively; optical reflector 4, the optical imaging lens 5 of fixed focal length, rear burnt near infrared light optical light filter 6; image imaging sensor 7, it is arranged on same imaging optical axis 0 successively according to said sequence relative position.
Near-infrared LED lighting source (1L, 1R) near infrared light of radiation and peripheral environment light are after object space iris reflex, enter optical reflector 4, for 90 degree of vertical transitions light paths, enter the optical imaging lens 5 of fixed focal length, the optical imaging lens 5 of described fixed focal length is configured to automatic focus AF optical imaging lens or fixed-focus optical imaging lens; Realizing optical focus makes image light signals converted image electric signal export to the image imaging sensor 7 being positioned at image space, rear burnt near infrared light optical light filter 6 filters the wavelength being used for imaging, the signal to noise ratio snr (SNR:signal-to-noiseratio) of the background interference parasitic light of imaging wavelength and non-imaged is met: >=60dB (1000:1).
Remarks illustrate: peripheral environment light just refers to: when user identifies environment for use illuminance be required to meet indoor complete darkness 0Lux to the said natural light of outdoor sun direct projection 100,000Lux.Object space iris refers to the left and right iris being arranged in imaging viewing field 2 in Fig. 1, its on the object direction of imaging optical axis 0 so claim object space iris.
Within the thickness of mobile terminal as smart mobile phone requirement iris authentication system image imaging modules is only 5mm, very unfortunate thickness like this cannot realize optical imaging lens 5 focal length more than 4mm at all, even if adopt the imageing sensor of very small pixels size as 1.4um, also user's service range only can be made at about 15cm, but user habit service range is generally at more than 20cm, and the lightsensitivity that produces of the imageing sensor of the small pixel size adopting traditional F SI (front light incident) manufacturing process technology to manufacture and signal to noise ratio (S/N ratio) very low, have a strong impact on the image image quality of iris authentication system.
The specific embodiment of the invention 1 is configured with optical reflector 4, important characteristic is realized for 90 degree of vertical transitions light paths, the components placement position of optical imagery module is shifted, horizontal direction is converted to from thickness direction, the space nearly number cm that horizontal direction generally can be placed for parts, therefore so design breaches the restriction of mobile terminal to the thickness of optical imagery module, the fixed focal length of the optical imaging lens of relatively large volume can be realized further, user's service range is at more than 20cm, and use the image imaging sensor 7 of relatively large Pixel Dimensions to produce relatively large lightsensitivity and signal to noise ratio (S/N ratio), improve the quality of optical imaging of iris authentication system.
Although special instruction the present invention realizes light chopper by design optical reflector 4, other light chopper methods also should by equivalent understanding.
With the continuous progress of image imaging sensor 7 technology, the image imaging sensor of the small pixel size of current employing BSI (backlight is incident) manufacturing process technology also can meet the quality of optical imaging of iris authentication system substantially, also should by equivalent understanding even if the present invention does not adopt reverberator to carry out light chopper, as a kind of simplification of the present invention, Fig. 5 is the general principles figure of the specific embodiment of the invention 1 iris recognition optical imagery module simplifying, and it is removed reverberator.
Be described as follows:
Because the main cause affecting thickness limits is the thickness of the optical imaging lens 5 of fixed focal length.
Fixed focal length FEL according to hereafter formula optical imaging lens 5 is:
EFL＝WD*β；
Wherein: WD represents the working substance distance of imaging system, i.e. service range;
β is the enlargement ratio of optical imaging system;
β＝SOP*ROP；
SOP is the physical size of image imaging sensor 7 unit picture element;
ROP is iris image pixel resolution, as 15pixels/mm;
Suppose that the service range identified is 20cm, adopt the image imaging sensor of large Pixel Dimensions as 2um/pixel;
The then fixed focal length FEL=6mm of optical imaging lens 5, namely thickness is more than 6mm.Within the thickness of mobile terminal as smart mobile phone requirement iris authentication system image imaging modules is only 5mm, optical imaging lens fixed focal length is no more than 4mm, is to realize, and just adopts the scheme of Fig. 1 to use optical reflector 4 to carry out 90 degree of vertical transitions light paths.
The reason that Fig. 5 can remove reverberator simplifies is, adopt the image imaging sensor of small pixel size as 1um/pixel, the service range of same identification is 20cm, according to the fixed focal length FEL=3mm of its optical imaging lens 5 of above-mentioned formula, i.e. and thickness 3mm.Its thickness is that the thickness of the iris authentication system image imaging modules meeting mobile terminal requirement is no more than 5mm.
In environment for use, the interference parasitic light of the non-imaged of different light degree has a strong impact on iris image quality.Illuminance is larger, and to affect iris image quality larger.
The motion blur that the different translational speed of user causes has a strong impact on iris image quality, and translational speed is larger, and to affect iris image quality larger.
User wears under the environment for use of all kinds of glasses and mirror-reflection appears in iris image, has a strong impact on iris image quality.
Following design is adopted for overcoming above problem the present invention:
Near-infrared LED lighting source (1L, 1R) is configured to: the left and right sides being positioned at imaging optical axis 0; LED is SMT encapsulation and by the light of LED current driver (1L ', 1R ') driver output short cycle T maximum radiation intensity I.
Near-infrared LED lighting source (1L, 1R) and image imaging sensor 7 are combined and are configured to:
1. the maximum radiation intensity I short cycle T sequential that near-infrared LED lighting source (1L, 1R) produces equals the cycle sequential of image imaging sensor frame picture element global trigger exposure (integration);
Near-infrared LED lighting source (1L, 1R) maximum radiation intensity I (mW/sr, the every sterad of milliwatt) should meet:
I=E*WD2/cos2 φ E<10mW/cm2WD represents the working substance distance of imaging system.
E is defined as the greatest irradiation illumination (mW/cm2 of the lighting source that working substance accepts apart from WD place, milliwatt every square centimeter), E requires to be less than eyes LED illumination radiation safety international standard (IEC62471:2006Photobiologicalsafetyoflampsandlampsystems) upper limit, this standard limits LED illumination radiation may to retina, the heat radiation bio-safety effect caused of crystalline and cornea.
Emission angle φ just refers to the line of near-infrared LED lighting source (1L, 1R) center to iris center, left and right and the angle of imaging optical axis 0.Also have concrete sign in figure 3, namely represent the emission angle φ d of the lighting source being used for direct illumination imaging and represent the emission angle φ c of the lighting source being used for cross-illumination imaging, emission angle φ is the general designation of φ d and φ c.
Remarks illustrate:
In above-mentioned formula, φ determines it is φ d or φ c according to direct illumination imaging or cross-illumination imaging.
Should meet when emission angle φ is the emission angle φ d of direct illumination imaging: 5.7-11.25 degree,
Should meet when emission angle φ is the emission angle φ d of cross-illumination imaging: 11.25-35 degree.
The short cycle T (ms, millisecond) of the radiation that near-infrared LED lighting source (1L, 1R) produces should meet: T≤3.33ms;
Fig. 2 further illustrates the cycle sequential schematic diagram of the frame picture element global trigger exposure (integration) of maximum radiation intensity short cycle sequential that the specific embodiment of the invention 1 near-infrared LED lighting source (1L, 1R) produces and image imaging sensor 7.
The method of the frame picture element global trigger exposure (integration) of image imaging sensor 7 of the present invention, have employed and only in imaging wavelength range He in maximum radiation intensity short cycle, carry out trigger exposure (integration) to all frame pixels of image imaging sensor 7 simultaneously.
Even if the exposure cycle sequential as electronic scroll shutter (ERS) its different rows is inconsistent, but meet carry out the condition of overall trigger exposure with all frame pixels in maximum radiation intensity short cycle in imaging wavelength range under simultaneously, the ratio of exposure (integration) the photon signal semi-invariant in maximum radiation intensity short cycle and outside maximum radiation intensity short cycle is much larger than 1000:1, like this 8 or 10 are only for the most effective resolution of general imaging sensor ADC, negligible.
Therefore this method is applicable to all types of imaging sensor, as global shutter (globalshutter), and electronic scroll shutter (ERS) or overall situation release shutter GRS etc., various all types of imaging sensor.
Adopt near-infrared LED lighting source (1L, the method that maximum radiation intensity short cycle 1R) produced mates with the cycle sequential of image imaging sensor 7 frame picture element global trigger exposure (integration), this is also important advantage characteristic of the present invention.
Owing to being adopt short cycle method of radiating, according to international standard, it produced 10 radiation also only less than the equivalent radiated power amount of 10* (3.33ms/1s)=1/30 in continuous 1 second, so the radiation of its equivalence is much smaller than the international standard upper limit.
Its light source power consumption of iris recognition optical imagery module of same so design consumes low, only has the equivalent radiated power amount of 1/30 compared with traditional continuous radiation light source.
The signal to noise ratio snr (SNR:signal-to-noiseratio) that design like this can improve the imaging wavelength of at least 10 times and the interference parasitic light of non-imaged meets: >=80dB (10000:1).
Design like this make the environment for use illuminance of iris recognition optical imagery module be required to meet indoor complete darkness 0Lux to outdoor sun direct projection 100,000Lux.
The frame picture element global trigger exposure (integration) of prior short cycle can eliminate the motion blur of 1m/s completely, and the translational speed of iris image imaging is required to meet from walking translational speed 1m/s to completely static translational speed 0cm/s.
This is also another important advantage characteristic of the present invention.
2. near-infrared LED lighting source (1L, 1R) adopts and carries out direct illumination and cross-illumination imaging left and right iris with image imaging sensor 7 timesharing cyclic switching.There is mirror-reflection in iris image under the environment for use avoiding wearing all kinds of glasses, have a strong impact on iris image quality.
Fig. 3 explains that the specific embodiment of the invention 1 near-infrared LED lighting source (1L, 1R) and image imaging sensor 7 timesharing cyclic switching carry out direct illumination and cross-illumination imaging left and right iris further.
1L represents left side near-infrared LED lighting source; 1R represents right side near-infrared LED lighting source;
2L represents left iris; 2R represents right iris;
3L represents left iris imaging optical axis; 3R represents right iris imaging optical axis;
φ d represents the emission angle of the lighting source for direct illumination imaging; φ c represents the emission angle of the lighting source for cross-illumination imaging; WD represents the working substance distance of imaging system.
Wherein:
Emission angle φ d for the lighting source of direct illumination imaging should meet: 5.7-11.25 degree.
Emission angle φ c for the lighting source of cross-illumination imaging should meet: 11.25-35 degree.
Emission angle φ d and φ c is defined as the line of near-infrared LED lighting source (1L, 1R) center to iris center (2L, 2R) and the angle of imaging optical axis (3L, 3R).
That is, emission angle φ d represents the emission angle of the lighting source for direct illumination imaging;
Emission angle φ c represents the emission angle of the lighting source for cross-illumination imaging.
Concrete is explained as follows: timesharing formed left side near-infrared LED lighting source 1L and left side iris 2L direct illumination imaging Ia and with right side iris 2R cross-illumination imaging Ib, right side near-infrared LED lighting source 1R and left side iris 2L cross-illumination imaging Ic and with right side iris 2R direct illumination imaging Id, because image imaging sensor 7 imaging simultaneously can export left and right sides iris image (2L, 2R), so the side near-infrared LED lighting source that timesharing is formed can produce direct illumination image and the cross-illumination image of left and right sides iris simultaneously, then cyclic switching is carried out in order, i.e. IaIb->IcId->IaIb-GreatT.Grea T.GTIcId ... until obtain high-quality iris image.
Idiographic flow is:
(1) close right side near-infrared LED lighting source 1R, open left side near-infrared LED lighting source 1L;
(2) image imaging sensor 7 imaging simultaneously exports left side iris 2L direct illumination image Ia and right side iris 2R cross-illumination image Ib;
(3) close left side near-infrared LED lighting source 1L, open right side near-infrared LED lighting source 1R;
(4) image imaging sensor 7 imaging simultaneously exports right side iris 2R direct illumination image Id and left side iris 2L cross-illumination image Ic;
(5) iris image quality is judged, meet quality requirements and close left and right sides near-infrared LED lighting source (1L, 1R), do not meet quality requirements then to return (1) and carry out timesharing cyclic switching until meet quality requirements by process order.
Remarks illustrate: meet quality requirements and just refer to meet, under the environment for use wearing all kinds of glasses, iris image does not occur mirror-reflection, and the not serious iris image quality that affects is used to identify.Said this professional domain of judgment rule is generally by the specular reflection point of iris region in detected image, and namely the quantity accounting of the pixel value of full scale (maximal value) is added up.
Concrete implementation column 1 describes and adopts left and right sides near-infrared LED lighting source (1L, 1R) method, but considers the miniaturization volume restriction of mobile device, so only employing arranges left or right side near-infrared LED lighting source is also feasible.
For realizing the high-quality iris imaging image obtaining luminance proportion, near-infrared LED lighting source (1L, 1R) and optical imaging lens 5 are combined and are configured to:
Half peak of radiation of near-infrared LED lighting source (1L, 1R) or dispersion angle FWHM are more than or equal to the imaging viewing field angle FOV of optical imaging lens 5; The region that the imaging viewing field 2 i.e. imaging viewing field angle of optical imaging lens 5 is formed.
Remarks illustrate:
Imaging viewing field angle FOV is the imaging viewing field 2 marked in Fig. 1, horizontal X axle scope W, the region of vertical Y axle scope H.
Half peak of radiation of near-infrared LED lighting source (1L, 1R) as shown in Figure 1 or dispersion angle θ.
Ensure imaging viewing field luminance proportion ρ=Iedge/Icenter*100% >=50%;
Wherein:
Iedge is imaging viewing field edge brightness;
Icenter is imaging viewing field center brightness.
Near-infrared LED lighting source (1L, 1R) and rear burnt near infrared light optical light filter 6 are configured to:
Half peak transmission wavelength FWHM of rear burnt near infrared light optical light filter 6 is more than or equal to half peak emission wavelength FWHM of near-infrared LED lighting source (1L, 1R).Design like this can obtain imaging wavelength utilization factor to greatest extent.
The fixed focal length FEL of the optical imaging lens 5 of fixed focal length is configured to:
EFL＝WD*β
Wherein: WD represents the working substance distance of imaging system;
β is the enlargement ratio of optical imaging system;
β＝SOP*ROP
SOP is the physical size of image imaging sensor unit picture element, as 2um/pixel;
ROP is iris image pixel resolution, as 15pixels/mm;
As decipherment distance 20cm adopts FEL=6mm.
The optical space resolution (opticalspatialresolution) of the optical imaging lens 5 of fixed focal length is configured to:
Should meet in object space plane: during 60% modulation transfer function, (MTF=0.6) >=4 line is to every millimeter (lp/mm);
The optical imaging lens 5 of described fixed focal length is configured to: fixed focus lenses, liquid crystal drive lens, VCM voice coil loudspeaker voice coil drive lens, MEMS drives lens, the wavefront coded lens of EDOF, in WLA wafer level lens array any one.
Liquid crystal drive lens, VCM voice coil loudspeaker voice coil drives lens, and MEMS drives lens, and EDOF phase front coding lens, WLA wafer level lens array is arranged to the automatic focus AF realizing optical imaging lens.
Image imaging sensor 7 is configured to:
At least HD high definition pixel resolution, i.e. 1920 pixel * 1080 pixels;
Can be formed according to the iris image pixel resolution requirements of 15 pixel every millimeter (pixels/mm):
Horizontal X axle identification range W at least 12.8cm, vertical Y axle identification range H at least 7.2cm.
Further for expansion identification range image imaging sensor 7 is configured to:
At least 500 ten thousand pixel resolutions, 2592 pixel * 1944 pixels;
Can be formed according to the iris image pixel resolution requirements of 15 pixel every millimeter (pixels/mm):
Horizontal X axle identification range W at least 17.4cm, vertical Y axle identification range H at least 13.0cm.
The iris recognition optical imagery module of concrete implementation column 1 is arranged on intelligent movable mobile phone, user in use outside pie graph as schematic diagram 4.
Fig. 4 informs following content:
Intelligent movable mobile phone comprises the transmission protection optical window 3 of iris recognition optical imagery module, pilot lamp 11, near-infrared LED lighting source (1L, 1R), liquid crystal display 10 (LCD).Fig. 4 is outside pie graph, so the optical imagery module not showing its inside forms (Inner Constitution is with reference to figure 1 or Fig. 5).
The transmission protection optical window 3 of described iris recognition optical imagery module; be covered in intelligent movable mobile phone front surface; pilot lamp 11 is connected safety chip 9 (not shown) with intelligent movable mobile phone liquid crystal screen 10 (LCD); be used for realizing using state by the control of safety chip 9 to guide; as pilot lamp 11 luminescence instruction, liquid crystal display 10 shows image and Word message.
Improve man-machine interface when user uses for optimizing further, voice and pilot lamp 11 guide for using state, and as shown blue indicating user OK range, red instruction recognition failures, green instruction identifies successfully.
The further transmission protection optical window 3 of iris recognition optical imagery module; the extra-regional color of its optical imagery and outward appearance are designed to the characteristic with obvious visual contrast; object is that the iris recognition optical imaging system can stared in use in transmission protection optical window 3 for user forms the blinkpunkt of direct-view but not looks side ways point; namely the eyes of user and imaging optical axis remain on same axis, avoid user in use driftlessness observation blindly form stravismus imaging and then affect picture quality.
Transmission protection optical window 3, also can be substituted by mobile terminal outside surface.Its entirety is covered in intelligent movable mobile phone front surface, and it uses material to comprise the PMMA of high-transmission rate, PC, or tempered glass etc.
The further upper part of liquid crystal display 10 (LCD) that carries of smart mobile phone; real-time display client iris image uses further to guide user; comprise display mode of operation; special instruction; in the upper part position display of the liquid crystal display 10 close to iris recognition optical imagery module transmission protection optical window 3; be observe for reducing the user when short distance uses the stravismus that liquid crystal display causes eyes and imaging axis, the iris recognition optical imagery module of certainly equivalent understanding also can tilt installation.
In practical service environment, illuminance indoor complete darkness 0Lux to outdoor sun direct projection 100,000Lux, the scene of so large change causes iridopupillary wide variation usually, as outdoor pupil can reduce minimizing incident light, dark scene can be amplified pupil and be increased incident light, and then affects iris recognition rate.The pupil being designed to obtain in real time according to Algorithm of Iris Recognition for the brightness of the pilot lamp 11 and liquid crystal display 12 that overcome the concrete implementation column 1 of this problem adjusts than row change tread with iris diameter, such as pupil and iris diameter are more excessive than arranging just means that pupil amplifies, the brightness of pilot lamp 11 and liquid crystal display 12 needs to increase, otherwise pupil and iris diameter be too small myosis of just meaning than arranging, the brightness of pilot lamp 11 and liquid crystal display 12 needs to reduce.
The volume encapsulation that all devices of concrete implementation column 1 and element adopt according to current smart mobile phone, as safety chip 9 and the image imaging sensor 7 of the BGA package of microminiaturization, optical element can realize miniaturization by professional domain current techiques such as microminiaturized Shooting Techniques.
Embodiment 2, iris recognition optical imagery module of the present invention carry out the method for safety identification authentication, comprise the following steps:
1. safety chip 9 is for connecting the digitized iris image obtaining image imaging sensor 7 and export,
2. safety chip 9 performs extraction iris feature information with carrying out Algorithm of Iris Recognition.
Consider that safety chip 9 computing power is not enough, part expends the process of calculated amount as Image semantic classification and Iris Location, primary processor can be placed into complete, the primary processor only pretreated Iris Location coordinate information of output image returns safety chip 9, this process is safe, even if the elements of a fix are intercepted and captured it can not be associated with iris feature information.
3. safety chip 9 generates iris feature template, because generative process is only controlled by safety chip, so be safe by iris feature information.
4. iris feature template adopts cryptography system to be stored in as private key in safety chip, and ensures never be exported and access.This cryptography system comprises PKI encryption system and HASH hashing algorithm etc., is used for ensureing the safety of feature templates data own.
5. the authentication comparison of iris feature template is all carried out in safety chip 9 inside, guarantees mobile terminal at the whole process safety of authentication not by external attack.
Safety chip 9 can be individual chips also can be integrated in application primary processor, as the ARM framework chip that mobile terminal generally uses, it comprises primary processor ARMcortex-A kernel, also the safety certification processor of the integrated independently TrustZone for safety applications realizes the application isolation of safety chip function and primary processor alternately, can realize safety identification authentication method of the present invention.
Remarks illustrate: said process is the optics formation that a software processes does not relate to iris recognition optical imagery module, but this verification process is indispensable as the overall object realizing being used for mobile terminal safety authentication, safety chip 9 is for connecting the digitized iris image obtaining image imaging sensor 7 and export, and then safety chip 9 carries out software process according to the method step of safety identification authentication after acquisition image.Wherein Algorithm of Iris Recognition, cryptography system belongs to known technology.
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 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 (16)
1. for the iris recognition optical imagery module of mobile terminal safety authentication, comprise near-infrared LED lighting source (1L, 1R), the optical imaging lens (5) of fixed focal length, rear burnt near infrared light optical light filter (6), image imaging sensor (7), it is characterized in that:
Configuration safety chip (9);
Near-infrared LED lighting source (1L, 1R) is configured to:
Be positioned at the left and right sides of imaging optical axis (0);
LED is SMT encapsulation and by the light of LED current driver (1L ', 1R ') driver output short cycle T maximum radiation intensity I;
Near-infrared LED lighting source (1L, 1R) and image imaging sensor (7) are combined and are configured to:
1). the maximum radiation intensity I short cycle T sequential that near-infrared LED lighting source (1L, 1R) produces equals the cycle sequential of image imaging sensor (7) frame picture element global trigger exposure; Adopt short cycle radiation in 1 second, produce the equivalent radiated power amount of radiation number of times, realize light source low in energy consumption;
2). near-infrared LED lighting source (1L, 1R) adopts and carries out direct illumination and cross-illumination imaging left and right iris with image imaging sensor (7) timesharing cyclic switching;
Near-infrared LED lighting source (1L, 1R) and optical imaging lens (5) are combined and are configured to:
Half peak of radiation of near-infrared LED lighting source (1L, 1R) or dispersion angle FWHM are more than or equal to the imaging viewing field angle FOV of optical imaging lens (5);
Described imaging viewing field angle FOV is the region of horizontal X axle scope W in imaging viewing field (2), vertical Y axle scope H;
Near-infrared LED lighting source (1L, 1R) and rear burnt near infrared light optical light filter (6) are combined and are configured to:
Half peak transmission wavelength FWHM of rear burnt near infrared light optical light filter (6) is more than or equal to half peak emission wavelength FWHM of near-infrared LED lighting source (1L, 1R);
Optical imaging lens (5) is configured to: fixed focus lenses, liquid crystal drive lens, VCM voice coil loudspeaker voice coil drive lens, MEMS to drive lens, EDOF phase front coding lens, any one in WLA wafer level lens array.
2. for the iris recognition optical imagery module of mobile terminal safety authentication, comprise near-infrared LED lighting source (1L, 1R), the optical imaging lens (5) of fixed focal length, rear burnt near infrared light optical light filter (6), image imaging sensor (7), it is characterized in that:
Configuration safety chip (9);
Near-infrared LED lighting source (1L, 1R) is configured to:
Be positioned at the left and right either side of imaging optical axis (0);
LED is SMT encapsulation and by the light of LED current driver (1L ', 1R ') driver output short cycle T maximum radiation intensity I;
Near-infrared LED lighting source (1L, 1R) and image imaging sensor (7) are combined and are configured to:
1). the maximum radiation intensity I short cycle T sequential that near-infrared LED lighting source (1L, 1R) produces equals the cycle sequential of image imaging sensor (7) frame picture element global trigger exposure; Adopt short cycle radiation in 1 second, produce the equivalent radiated power amount of radiation number of times, realize light source low in energy consumption;
2). near-infrared LED lighting source (1L, 1R) adopts and carries out direct illumination and cross-illumination imaging left and right iris with image imaging sensor (7);
Near-infrared LED lighting source (1L, 1R) and optical imaging lens (5) are combined and are configured to:
Half peak of radiation of near-infrared LED lighting source (1L, 1R) or dispersion angle FWHM are more than or equal to the imaging viewing field angle FOV of optical imaging lens (5);
Described imaging viewing field angle FOV is the region of horizontal X axle scope W in imaging viewing field (2), vertical Y axle scope H;
Near-infrared LED lighting source (1L, 1R) and rear burnt near infrared light optical light filter (6) are combined and are configured to:
Half peak transmission wavelength FWHM of rear burnt near infrared light optical light filter (6) is more than or equal to half peak emission wavelength FWHM of near-infrared LED lighting source (1L, 1R);
Optical imaging lens (5) is configured to: fixed focus lenses, liquid crystal drive lens, VCM voice coil loudspeaker voice coil drive lens, MEMS to drive lens, EDOF phase front coding lens, any one in WLA wafer level lens array.
3. the iris recognition optical imagery module for mobile terminal safety authentication according to claim 1 and 2, is characterized in that:
Emission angle φ d for the LED illumination light source of direct illumination imaging should meet: 5.7-11.25 degree;
Emission angle φ c for the LED illumination light source of cross-illumination imaging should meet: 11.25-35 degree;
Emission angle φ is defined as the line of near-infrared LED lighting source (1L, 1R) center to iris center, left and right and the angle of imaging optical axis (0); Described emission angle φ is the general designation of φ d and φ c.
4. the iris recognition optical imagery module for mobile terminal safety authentication according to claim 1, is characterized in that:
Described timesharing cyclic switching carries out direct illumination and cross-illumination imaging left and right iris comprises the following steps:
(1) close right side near-infrared LED lighting source (1R), open left side near-infrared LED lighting source (1L);
(2) image imaging sensor (7) imaging simultaneously exports left side iris direct illumination image Ia and right side iris cross-illumination image Ib;
(3) close left side near-infrared LED lighting source (1L), open right side near-infrared LED lighting source (1R);
(4) image imaging sensor (7) imaging simultaneously exports right side iris direct illumination image Id and left side iris cross-illumination image Ic;
(5) judge left and right iris image quality, meet quality requirements and close left and right sides near-infrared LED lighting source (1L, 1R), do not meet quality requirements and then return (1) by process order until meet quality requirements.
5. the iris recognition optical imagery module for mobile terminal safety authentication according to claim 1 and 2, is characterized in that:
Described near-infrared LED lighting source (1L, 1R) maximum radiation intensity I (mW/sr, the every sterad of milliwatt) should meet:
I=E*WD
2/ cos
2φ E<10mW/cm
2wD represents the working substance distance of imaging system;
E is defined as the greatest irradiation illumination of the lighting source that working substance accepts apart from WD place, E requires to be less than eyes LED illumination radiation safety international standard (IEC62471:2006Photobiologicalsafetyoflampsandlampsystems) upper limit, this standard limits LED illumination radiation may to retina, the heat radiation bio-safety effect caused of crystalline and cornea;
The short cycle T (ms, millisecond) of the radiation that described near-infrared LED lighting source (1L, 1R) produces should meet:
T≤3.33ms。
6. the iris recognition optical imagery module for mobile terminal safety authentication according to claim 1 and 2, is characterized in that:
The fixed focal length FEL of described optical imaging lens (5) is configured to:
EFL＝WD*β；
Wherein: WD represents the working substance distance of imaging system;
β is the enlargement ratio of optical imaging system;
β＝SOP*ROP；
SOP is the physical size of image imaging sensor (7) unit picture element;
ROP is iris image pixel resolution.
7. the iris recognition optical imagery module for mobile terminal safety authentication according to claim 1 and 2, is characterized in that:
The optical space resolution (opticalspatialresolution) of described optical imaging lens (5) is configured to:
Should meet in object space plane: time 60% modulation transfer function (MTF=0.6) >=4 lines are to every millimeter (lp/mm).
8. the iris recognition optical imagery module for mobile terminal safety authentication according to claim 1 and 2, is characterized in that:
Described iris recognition optical imagery module configuration optical reflector (4), for vertical transitions light path.
9. the iris recognition optical imagery module for mobile terminal safety authentication according to claim 1 and 2, is characterized in that:
Described image imaging sensor (7) is configured to: at least HD high definition pixel resolution, 1920 pixel * 1080 pixels.
10. the iris recognition optical imagery module for mobile terminal safety authentication according to claim 1 and 2, is characterized in that:
Described image imaging sensor (7) is configured to: at least 500 ten thousand pixel resolutions, 2592 pixel * 1944 pixels.
The 11. iris recognition optical imagery modules for mobile terminal safety authentication according to claim 1 and 2, is characterized in that:
Described iris recognition optical imagery module configuration using state guides.
The 12. iris recognition optical imagery modules for mobile terminal safety authentication according to claim 11, is characterized in that:
Described using state guides and comprises voice, pilot lamp, liquid crystal display.
The 13. iris recognition optical imagery modules for mobile terminal safety authentication according to claim 12, is characterized in that:
The pupil that described pilot lamp and/or the brightness of liquid crystal display are designed to obtain in real time according to Algorithm of Iris Recognition adjusts than row change tread with iris diameter.
The 14. iris recognition optical imagery modules for mobile terminal safety authentication according to claim 1 and 2, it is characterized in that: described iris recognition optical imagery module configuration transmission protection optical window (3), the extra-regional color of its optical imagery and outward appearance are designed to the characteristic with obvious visual contrast; User's iris recognition optical imaging system can stared in use in transmission protection optical window (3) forms the blinkpunkt of direct-view but not looks side ways point.
The 15. iris recognition optical imagery modules for mobile terminal safety authentication according to claim 14, is characterized in that:
Described transmission protection optical window (3), can be substituted by mobile terminal outside surface, its entirety is covered in intelligent movable mobile phone front surface, and it uses material to comprise PMMA, PC or the tempered glass of high-transmission rate.
The iris recognition optical imagery module for mobile terminal as described in 16. utilizations are as arbitrary in claim 1 ~ 15 carries out the method for safety identification authentication, it is characterized in that comprising the following steps:
1), safety chip (9) connects the digitized iris image obtaining image imaging sensor (7) and export;
2), safety chip (9) carries out Algorithm of Iris Recognition execution extraction iris feature information;
3), safety chip (9) generates iris feature template by iris feature information;
4), iris feature template adopts cryptography system to be stored in as private key in safety chip (9), and ensures never be exported and access;
5), the authentication comparison of iris feature template all carries out in safety chip (9) inside, guarantees mobile terminal at the whole process safety of authentication not by external attack.
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