CN102542263A - Multi-mode identity authentication method and device based on biological characteristics of fingers - Google Patents
Multi-mode identity authentication method and device based on biological characteristics of fingers Download PDFInfo
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Abstract
The invention relates to a multi-mode identity authentication device based on the biological characteristics of fingers, which comprises a finger vein image collection module, a finger knuckle stripe image collection module, a fingerprint image collection module, a finger induction switch, an embedded type start of conversion pulse (SOC) authentication module, a control box, an input/output interface and a power supply module; the modules, the finger induction switch and the input/output interface are all installed on the control box, the finger vein image collection module, the finger knuckle stripe image collection module and the fingerprint image collection module are connected with an image input interface of the embedded type SOC authentication module so as to realize the collection of the biological characteristics of veins, finger knuckle stripes and fingerprints, and the finger induction switch is connected with a GPIO (General Purpose Input/Output) interface of the embedded type SOC authentication module so as to realize the detection of the placement of the fingers; and the power supply module is connected with each module so as to provide a power supply required for working. The invention relates to a multi-mode identity authentication method based on the biological characteristics of the fingers, which comprises characteristic registration and characteristic comparison comprising nine steps respectively. According to the multi-mode identity authentication device and the method based on the biological characteristics of the fingers, the safety of identity identification is effectively enhanced. The multi-mode identity authentication device and the method based on the biological characteristics of the fingers have extensive application prospect.
Description
Technical field
The present invention relates to a kind of multimode identity authentication method and device, belong to the biometrics identification technology field based on finger biologic characteristics.
Background technology
At present, more universal based on the personal identification technology of human body biological characteristics, like fingerprint recognition, recognition of face and iris authentication etc., but all exist characteristic stability not enough, the shortcoming that information is stolen easily and forges, poor stability; Fingerprint identification technology for example exists about 4% the user can't normal registration and identification, and fingerprint also is very easy to be stolen and copy; The vena identification technology is to utilize the vein blood vessel texture information of inside of human body as the personal identification characteristic, almost can't steal and forge, and can improve the security of personal identification greatly; And do not allow to be subject to the external factor influence, have better adaptability and stability.
The ultimate principle of vena identification is to utilize the relative musculature of oxygenated blood fluid that the near infrared spectrum of wavelength for 700-1000nm had than strong absorption; Utilize initiatively near-infrared light source irradiation to point and gather the train of thought texture image that finger-image can collect the finger blood vessel through camera head; Different light source design and light path design all can influence the vein train of thought texture image quality of collection, thereby influence the authentication effect.Though vein pattern is more stable than fingerprint, be not easy to be stolen and to forge, also there is following shortcoming, to cross like finger temperature and low can have a strong impact on vein image quality, finger rocks or rotation can collect pictures different, thereby can reduce the security that refers to vena identification.
Dactylus line authentication techniques show also have certain uniqueness through correlative study; So long as normal finger all has significantly dactylus line characteristic; There is not the problem that fingerprint recognition certain customers can't normal registration; It is more obvious, stable and be not easy to be stolen that characteristic is compared fingerprint, and main shortcoming is that characteristic is less relatively, does not also carry out its uniqueness of large-scale practice test at present.
From the security and the adaptability of practical application, also have no the biological characteristic authentication technology of individual event to satisfy the demand at present, multimode authentication is following developing direction; Experiment showed, that multimode system can effectively improve the security of identification, adaptability and anti-forgery ability, has very wide application prospect.
Summary of the invention
1, purpose: the purpose of this invention is to provide a kind of multimode identity authentication method and device based on finger biologic characteristics; Its selects vein, fingerprint and the dactylus line biological characteristic as authentication, need not to increase the collection that fingerprint recognition operation steps of user and use habit can be accomplished vein, fingerprint and dactylus line biological characteristic; The present invention adopts modular design, can realize fingerprint, refer to that the combination in any of vein and three kinds of biological characteristics of dactylus line carries out authentication.
2, technical scheme:
1) a kind of multimode authentication device of the present invention based on finger biologic characteristics, it is made up of finger vein image acquisition module 100, dactylus print image acquisition module 200, fingerprint image acquisition module 300, finger inductive switch 400, embedded SOC authentication module 500, control enclosure 900, IO interface 800 and power module 700; Position annexation between them, signal trend are: above-mentioned all modules, finger inductive switch and IO interface all are installed on the control enclosure.Refer to that vein image acquisition module 100, dactylus print image acquisition module 200 are connected with the image input interface of embedded SOC authentication module 500 with fingerprint image acquisition module 300; Realize the collection of vein, dactylus line and fingerprint biological characteristic; Finger inductive switch 400 is connected with the GPIO interface of embedded SOC authentication module 500, realizes the detection that finger is placed; Power module 700 is connected with each module and provides work required power supply for each module.Concrete annexation and signal trend are seen accompanying drawing 1 and accompanying drawing 2.
Described finger vein image acquisition module 100; This module is made up of near-infrared LED light supply apparatus 101 and vein image acquisition device 102; The former is placed on control enclosure 900 upper end plates; The latter is placed on control enclosure 900 bottoms, and they are connected with embedded SOC authentication module 500, and embedded SOC authentication module 500 is gathered vein image post analysis image; As crossing bright or crossing and secretly all can adjust the brightness of near-infrared LED light supply apparatus 101 and the time shutter of vein image acquisition device 102 automatically, realize that high-quality near infrared refers to vein train of thought IMAQ; This near-infrared LED light supply apparatus 101 is the near-infrared luminous diode of 850nm, receives light evenly and make full use of light source in order to make finger, be arranged at finger side top and be arranged in parallel successively apart from the general 4-8mm of dorsal surfaces of fingers place, and with point the plane and be predetermined angular; In order to adapt to the finger that thickness varies in size, the near infrared diode light-source brightness is adjustable, can be through dynamic ON/OFF of PWM mode (width modulation) and brightness regulation; For strengthening the optical uniformity that receives of finger the right and left; Be provided with near-infrared light source reflection unit 103; It is placed on the opposite and the control enclosure upper end of near-infrared LED light supply apparatus 101, and parallel with near-infrared LED light supply apparatus 101, has the effect of reflect near infrared light; To receive optical uniformity, this near-infrared light source reflection unit 103 are mirrors or have the material of reflection ray effect to strengthen finger; This vein image acquisition device 102 is made up of camera lens, optical filter and CMOS/CCD sensor devices, and relation is therebetween: the position of optical filter is between camera lens and CMOS/CCD photosensitive sensor; This camera lens adopts common mobile phone or USB cam lens; This optical filter adopts common 850nm bandpass filter, and can only see through wavelength is the near infrared light of 850nm; This CMOS/CCD sensor devices adopts common CMOS or ccd sensor; It is positioned over centre position, control enclosure 900 bottom, is used for gathering finger middle part vein texture image.
Said dactylus print image acquisition module 200; Form by led light source device 201 and dactylus print image harvester 202; They all are installed in the bottom position of control enclosure 900; Its middle finger joint print image harvester 202 can be identical multiplexing with the vein image acquisition device 102 in referring to vein image acquisition module 100, is connected with embedded SOC authentication module 500; This led light source device 201 is made up of light emitting diode, the irradiation finger belly upwards from control enclosure 900 bottoms, thus gather the dactylus print images through dactylus print image harvester 202.
Said fingerprint image acquisition module 300 adopts existing finger print acquisition module, is connected with embedded SOC authentication module 500;
Said finger inductive switch 400 is made up of one (when need gather fingerprint) or two electric capacity (when need not gather fingerprint) touch sensible switch, is to choose as required; They are positioned over third knuckle 605 and 2-5MM place, first knuckle 601 below respectively, are connected with embedded SOC authentication module 500, can provide high level signal after finger 600 correct the placements.
Said embedded SOC authentication module 500 comprises central processor CPU, internal memory RAM, and parts such as storer FLASH all are integrated in the chips, form system-on-a-chip, and FLASH is used for stored programme and user characteristics registration data; This module has parallel (like Fig. 1) and two kinds of mode of operations of serial (like Fig. 2) as the main control module of system; Parallel schema is meant that vena identification, finger print identifying and the authentication of dactylus line have independently embedded separately SOC authentication module 500, and system can parallel acquisition and authentication vein, fingerprint and dactylus line; Serial mode is meant vein, fingerprint, the shared embedded SOC authentication module 500 of dactylus line, and system realizes dactylus line, fingerprint in order and refers to the collection and the authentication of vein.
Said control enclosure 900 is box box body structures, and all parts of the present invention all are installed on it.Its top is down L shaped structure, is used to install near-infrared luminous diode; The center is provided with the groove of similar finger shape, is used for placing and detecting finger; Its underpart is box shape and is used to install each module, parts and cable etc.
Said IO interface 800 has IO interfaces commonly used such as USB, UART, GPIO.
Said power module 700 has 5V, 3.3V, voltage outputs such as 1.8, for each module provides work required power supply, specifically is to utilize the 5V power supply of USB and LDO power conversion chip to change.
Wherein, the quantity of this near-infrared luminous diode is 4-8;
Wherein, the quantity of this light emitting diode is 2-4;
Wherein, the luminous angle of this near-infrared luminous diode and finger plane are the predetermined angular of 1/2-1/3.
2) a kind of multimode identity authentication method based on finger biologic characteristics of the present invention, this method comprise characteristic registration and characteristic comparison process.
Characteristic registration concrete steps are following:
Step 1, system start-up;
Whether step 2 detects finger third knuckle 605 and correctly places;
Step 3, led light source device 201 is opened in the correct back of placing, and gathers the dactylus print image;
Step 4 is extracted dactylus line half-tone information, and is carried out image enhancing, binaryzation and micronization processes, extracts first knuckle line 602 and second knuckle line 604 relative position informations, as dactylus line characteristic information; Can also realize the accurate location of finger position according to dactylus line positional information; As extract the failure of first knuckle line and second knuckle line and then point out the user to point the placement mistake, need reappose;
Step 5 is gathered fingerprint image, analyzes the fingerprint image quality, the characteristic that takes the fingerprint and according to the weight of fingerprint image quality definition fingerprint characteristic;
Step 6 is opened near-infrared LED light supply apparatus 101, gathers to refer to vein image;
Step 7 detects and to refer to vein image, as image cross dark or cross bright then adjust light-source brightness with after the time shutter again collection refer to vein image;
Step 8, shearing refers to the sub-piece of vein center, carries out figure image intensifying, filtering, normalization, binaryzation and refers to that vein pattern extracts;
Step 9 is preserved dactylus line, fingerprint and is referred to vein pattern information; Aspect ratio is following to concrete steps:
Step 1, system start-up;
Whether step 2 detects finger third knuckle 605 and correctly places;
Step 3, led light source device 201 is opened in the correct back of placing, and gathers the dactylus print image;
Step 4 is extracted dactylus line half-tone information, and is carried out image enhancing, binaryzation and micronization processes, extracts first knuckle line 602 and second knuckle line 604 relative position informations, realizes the accurate location of finger position according to dactylus line positional information; As extract the failure of first knuckle line and second knuckle line and then point out the user to point the placement mistake, need reappose, precise positioning of fingers can effectively improve comparison speed and the authentication precision that refers to vein;
Step 5, it is right to carry out aspect ratio according to the position of each streakline of dactylus line relation and registered user's dactylus line characteristic, and all comparison similarities are gathered N1 greater than the user of setting threshold for the user;
Step 6; Gather fingerprint image, analyze the fingerprint image quality, the characteristic that takes the fingerprint and according to the weight of fingerprint image quality definition fingerprint characteristic; And gather the user and to carry out fingerprint characteristic comparison among the N1, all comparison similarities are gathered N2 greater than the user of setting threshold for the user;
Step 7 is opened near-infrared LED light supply apparatus 101, gathers to refer to vein image;
Step 8 detects and to refer to vein image, as image cross dark or cross bright then adjust light-source brightness with after the time shutter again collection refer to vein image;
Step 9 is sheared and to be referred to the sub-piece of vein center, carries out figure image intensifying, filtering, normalization, binaryzation and refers to that vein pattern extracts, and gather the user and to carry out the vein pattern comparison among the N2, then compares success like the comparison similarity greater than setting threshold, otherwise the comparison failure;
It is fit to ultra-large user capacity identification, is applicable to all user groups, has very high security.
3, advantage and effect: in the present invention, refer to that vena identification is a core of the present invention, adopt the light-source system and the authentication method that are different from existing finger vein authentication apparatus, can effectively improve the acquisition quality and the authentication effect that refer to vein image; When realizing referring to vena identification, can effectively merge finger print identifying and dactylus line authentication techniques, important breakthrough is arranged on following technical indicator:
Security can significantly reduce misclassification rate;
Universality almost can adapt to all groups;
User experience can effectively improve percent of pass;
Forge difficulty, can significantly improve the difficulty that characteristic is stolen and forges;
The identification user capacity, the user capacity and the accuracy that can significantly improve recognition application.
Description of drawings
Fig. 1 is the system chart of concurrent working pattern of the present invention;
Fig. 2 is the system chart of work in series pattern of the present invention;
Fig. 3 is a near-infrared LED light supply apparatus principle of work synoptic diagram of the present invention;
Fig. 4 is each position name synoptic diagram of finger among the present invention;
Fig. 5 refers to the structure drawing of device of vena identification embodiment for the present invention;
Fig. 6 refers to the device sectional view of vena identification embodiment for the present invention;
Fig. 7 merges the structure drawing of device of authentication embodiment for the present invention refers to vein dactylus line bimodal;
Fig. 8 merges the device sectional view of authentication embodiment for the present invention refers to vein dactylus line bimodal;
Fig. 9 merges the structure drawing of device of authentication embodiment for the present invention refers to vein fingerprint bimodal;
Figure 10 merges the device sectional view of authentication embodiment for the present invention refers to vein fingerprint bimodal
Figure 11 merges the structure drawing of device of authentication embodiment for the present invention refers to vein dactylus line fingerprint three mode;
Figure 12 merges the device sectional view of authentication embodiment for the present invention refers to vein dactylus line fingerprint three mode
Figure 13 is the multi-modal fusion authentication of the present invention characteristic registering flow path figure.
Figure 14 is the multi-modal fusion authentication of the present invention aspect ratio flow figure
Concrete label is following among the figure:
100, vein image acquisition module 200, dactylus print image acquisition module
300, fingerprint image acquisition module 400, finger inductive switch
500, embedded SOC authentication module 600, finger
700, power module 800, IO interface 900, control enclosure
101, near-infrared LED light supply apparatus 102, vein image acquisition device
103, near-infrared light source reflection unit
201, led light source device 202, dactylus print image harvester
401, third knuckle inductive switch 402, first knuckle (finger tip) inductive switch
601, first knuckle (finger tip) 602, first knuckle line
603, second knuckle 604, second knuckle line
605, third knuckle 606, fingerprint collecting zone
607, refer to the sub-piece of vein center
S101-S116, S201-S223 are the flow process sequence number
The luminous focusing angle of α near-infrared LED;
The illuminated centerline of β near-infrared LED and the angle of pointing the plane;
Embodiment
For making the object of the invention, technical scheme and advantage clearer, below develop simultaneously preferred embodiment to further explain of the present invention with reference to accompanying drawing.
Fig. 1 is the system chart of concurrent working pattern of the present invention; Refer to that vein acquisition module 100, dactylus line acquisition module 200 and finger print acquisition module 300 are connected with embedded SOC authentication module 500 independently respectively; Wherein be primary module with referring to the embedded SOC authentication module 500 that vein acquisition module 100 is connected; External IO interface 800 is provided; Finger inductive switch 400 also only is connected with primary module, and all the other embedded SOC authentication modules 500 are from module, are controlled by primary module through UART or other interfaces; The advantage of concurrent working pattern is meant that vena identification, the authentication of dactylus line and finger print identifying can carry out synchronously, and authentication is quick, and shortcoming is that cost is higher, and system is comparatively complicated, and is unfavorable for device miniaturization.Above-mentioned all modules, finger inductive switch 400 and IO interface 800 all are installed on the control enclosure 900.
Concrete principle of work is following:
When primary module detects finger inductive switch 400 for high level; Expression has finger to insert, and gives from module through the communication interface sending controling instruction, after module receives steering order, gathers dactylus line and fingerprint image; And independent Flame Image Process and the verification process accomplished; Primary module is gathered immediately after having sent steering order and is referred to vein image, accomplish synchronously to refer to vein image processing and authentication, and the authentication result of comprehensive dactylus line and fingerprint provides the final authentication result.
Fig. 2 is the system chart of work in series pattern of the present invention, refers to that vein acquisition module 100, dactylus line acquisition module 200 and finger print acquisition module 300 unifications are connected to embedded SOC authentication module 500.Refer to that vena identification, the authentication of dactylus line and finger print identifying carry out in proper order, advantage is that cost is low, and equipment volume is little, and shortcoming is that authentication speed is slower.Above-mentioned all modules, finger inductive switch 400 and IO interface 800 all are installed on the control enclosure 900.
Fig. 3 is near-infrared LED light supply apparatus 101 principle of work synoptic diagram of the present invention, employing be one-sided luminous irradiation, opposite side reflection light filling mode.Near-infrared LED light supply apparatus 101 mainly is made up of two parts; A part is near-infrared luminous LED, and another part is the reflection facade, and near-infrared luminous LED adopts the near-infrared LED with focusing function; Luminous focusing angle [alpha] be 30 spend to 40 the degree; The illuminated centerline of near-infrared LED and finger plane angled β ≈ α/2 have 80% light quantity shine directly into finger for the finger of normal sized, other has the light quantity about 20% to shine the another side of finger through the reflection facade; Advantage is that finger is placed the custom nature; Finger receives light even, thereby can not occur that both sides are high brightly to influence picture quality with the dark situation in bright one side on one side, can also effectively reduce plant bulk.
Fig. 4 names synoptic diagram in each position in the present invention for finger; Every finger has five parts: first knuckle 601 (fingerprint part); First knuckle line 602 (first knuckle and second knuckle boundary); Second knuckle 603, second knuckle line 604 (second knuckle and third knuckle boundary), third knuckle 605.Wherein the fingerprint collecting zone is 606, refers to that the sub-piece of vein center is 607, refers to that the sub-piece 607 of vein center has comprised first knuckle line and second knuckle line.
See that Fig. 5 and Fig. 6 refer to vein single mode authentication embodiment: be fit to user capacity identification on a small scale
Fig. 5 and Fig. 6 are respectively present embodiment and refer to vein single mode authenticate device structural drawing and sectional view; Near-infrared LED light supply apparatus 101 is above the left side of finger; Third knuckle inductive switch 401 and first knuckle inductive switch 402 are respectively at the 2-5mm place, below of third knuckle (referring to root) 605 and first knuckle (finger tip) 601; What sensor is finger inductive switch 400 usefulness do not have specific limited; In all embodiment of the present invention, all adopt the touch sensor of electrostatic capacitive, electric capacity can change when the finger proximity transducer, and sensor can send high level signal when capacitance variations reaches certain threshold value; And then can detect and whether have finger to place, have only to detect simultaneously and just think to point when third knuckle inductive switch 401 all be high level signal with first knuckle inductive switch 402 and place.Refer to vein image acquisition device 102 and embedded SOC authentication module 500 on same circuit board, refer to that vein image acquisition device 102 is carried out to picture through the near infrared light that receives the finger transmission.
Embedded SOC authentication module 500 is connected with first knuckle inductive switch 402 with third knuckle inductive switch 401; Be connected with near-infrared LED light supply apparatus 101 with finger vein image acquisition device 102 simultaneously; After detecting the finger placement through finger inductive switch 400, embedded SOC authentication module 500 can be opened near-infrared LED light supply apparatus 101 and refer to vein image through referring to that vein image acquisition device 102 is gathered; Finger for different thicknesses; If time shutter one rule of the intensity of light source and cmos sensor vein image can occur referring to and cross dark and bright excessively situation; Need be according to the finger vein image grey level histogram dynamic adjustments intensity of light source and the CMOS time shutter of gathering, to adapt to dissimilar fingers, in all embodiment of the present invention, all adopt the mode of PWM (width modulation) to control the brightness of near-infrared LED light supply apparatus; Improve dutycycle and then reduce light-source brightness; And then the image deepening, reduce dutycycle and then strengthen light-source brightness, and then image brightens; Through I2C directly be set the CMOS exposure register adjustment time shutter, the time shutter strengthens then that image brightens, and the time shutter reduces then image deepening.
If picture quality meets the demands, then carry out finger edge and detect, the sub-piece of location vein center, the figure image intensifying, filtering, normalization, binaryzation and feature extraction, and carry out characteristic registration or aspect ratio equity according to user instruction.Then vena identification is successful greater than setting threshold to similarity like aspect ratio.
See that Fig. 7 and Fig. 8 refer to that vein dactylus line bimodal merges authentication embodiment: be fit to fairly large user capacity identification and the application higher to safety requirements;
Fig. 7 and Fig. 8 are respectively present embodiment and refer to that vein dactylus line bimodal merges authenticate device structural drawing and sectional view; General structure is identical with finger vein single mode authenticate device embodiment; Difference is on the circuit board at embedded SOC authentication module 500 places, to have increased led light source device 201; Led light source device 201 receives embedded SOC authentication module 500 controls, and irradiation refers to the belly position, and the light that dactylus print image harvester 202 receives the reflection of finger belly is carried out to picture.Present embodiment middle finger joint print image harvester 202 is shared with finger vein image acquisition device 102, interferes with each other for fear of light source, need control in real time light source.
After finger inductive switch 400 detected the finger placement, embedded SOC authenticate device 500 can at first be opened led light source device 201 (near-infrared LED light supply apparatus 101 is in closed condition), gathered the dactylus print image, and carried out gray processing; Rim detection, normalization, figure image intensifying, filtering; Binaryzation, refinement, first knuckle line 602 and second knuckle line 604 positional informations are extracted in operations such as feature extraction; If dactylus line characteristic does not exist, then be judged as illegal finger, provide information; If dactylus line characteristic is legal, accurately refer to the sub-piece 607 of vein center in the location according to the positional information of dactylus line, and compare with the dactylus line characteristic of registration simultaneously that all comparison similarities are gathered N1 greater than the user of setting threshold for the user.And then refer to the vein comparison provide the final authentication result according to the similarity that refers to the vein comparison.Refer to that specifically the vena identification flow process refers to vein single mode authentication embodiment together, be not described in detail in this.
See that Fig. 9 and Figure 10 refer to that vein fingerprint bimodal merges authentication embodiment: be fit to fairly large user capacity identification, the colony that fingerprint quality is not high also can use, the application that safety requirements is higher;
Fig. 9 and Figure 10 are respectively present embodiment and refer to that vein fingerprint bimodal merges authenticate device structural drawing and sectional view; General structure is identical with finger vein single mode authenticate device embodiment; Difference is that fingerprint image acquisition module 300 is connected with embedded SOC authentication module 500 with fingerprint image acquisition module 300 replacement first knuckle inductive switches 402; Fingerprint image acquisition module 300 is a well-known components, does not elaborate at this.
After third knuckle inductive switch 401 detects the finger placement; Embedded SOC authentication module 500 is gathered fingerprint image earlier; And fingerprint image carried out the quality assessment and the characteristic that takes the fingerprint; Carry out fingerprint comparison according to the fingerprint characteristic of registration and obtain the user and gather N1, and then refer to the vein comparison provide the final authentication result according to the similarity that refers to the vein comparison.Refer to that specifically the vena identification flow process refers to vein single mode authentication embodiment together, be not described in detail in this.
See that Figure 11 and Figure 12 refer to that vein dactylus line fingerprint three mode merge authentication embodiment: be fit to ultra-large user capacity identification, the colony that fingerprint quality is not high also can use, the application that safety requirements is very high;
Figure 11 and Figure 12 are respectively present embodiment and refer to that vein dactylus line fingerprint three mode merge authenticate device structural drawing and sectional view; General structure is identical with finger vein fingerprint bimodal fusion authentication embodiment; Difference is on the circuit board at embedded SOC authentication module 500 places, to have increased led light source device 201; Led light source device 201 receives embedded SOC authentication module 500 controls, and irradiation refers to the belly position, and the light that dactylus print image harvester 202 receives the reflection of finger belly is carried out to picture.Present embodiment middle finger joint print image harvester 202 is shared with finger vein image acquisition device 102, interferes with each other for fear of light source, need control in real time light source.
Concrete dactylus line, fingerprint and refer to that the vein acquisition principle is identical with finger vein dactylus line bimodal fusion authentication embodiment with verification process, is not described in detail in this;
Below to refer to that vein dactylus line fingerprint three mode merge the registration of authentication embodiment characteristic and the characteristic comparison method is done the explanation in a nearlyer step:
Figure 13 merges the characteristic registering flow path figure of authentication embodiment for dactylus line fingerprint refers to vein three mode.
Whether S101 detects finger and correctly places, and specifically is to detect whether third knuckle inductive switch 401 is high level, if for high level then think that finger is correct and place, as be low level, the then incorrect placement of finger;
S102 only detects and just continues registration after finger is correctly placed, otherwise detects always;
S103, when detecting the finger placement, embedded SOC authentication module 500 is opened led light sources 201 irradiation finger bellies (near-infrared LED light source 101 closed conditions);
S104 opens led light source device 201 backs and gathers the dactylus print image through image collecting device 102 or 202;
S105 closes led light source device 201 after having gathered the dactylus print image;
S106 extracts dactylus line characteristic information, before extracting dactylus line characteristic information, also need do necessary Flame Image Process such as image pre-service, figure image intensifying, filtering, binaryzation and refinement;
S107 then gathers fingerprint image after having extracted dactylus line characteristic;
S108, the fingerprint image quality assessment specifically is to carry out the fingerprint image quality assessment according to fingerprint image sharpness and the integrity degree gathered, and defines the weight of fingerprint characteristic according to evaluation result;
S109 meets the requirements like the fingerprint image quality, and characteristic then takes the fingerprint;
S110 accomplishes the collection and the feature extraction that refer to vein after dactylus line and fingerprint characteristic extract, before collection refers to vein image, must open near-infrared LED light supply apparatus 101;
S111, collection refers to vein image, refers to vein image through referring to that vein image acquisition device 102 is gathered;
S112 estimates and to refer to vein image quality, for too small or cross big strong hand and refer to that the finger vein image of gathering can cross brightly or dark excessively, needs adjust to dissimilar fingers, improves the finger vein image quality of gathering;
S113 judges whether picture quality meets the requirements, and gathers again like undesirable needs, specifically is to estimate according to the histogram information that refers to vein image, then thinks that like the main body gray space image meets the requirements within claimed range;
S114 if the undesirable needs of image are gathered again, then gathers again and estimates according to Gray Histogram spatial information adjustment light-source brightness and CMOS time shutter;
S115 meets the requirements like picture quality, then positions and shears to refer to the sub-piece 607 of vein center according to dactylus line positional information, and through the figure image intensifying, filtering, Flame Image Process flow processs such as normalization and binaryzation, extraction at last refers to vein pattern information;
S116, dactylus line, fingerprint and refer to that vein pattern information is all extracted and accomplish the characteristic information that all extractions are preserved in the back, prepare against aspect ratio to the time use.
Figure 14 merges the aspect ratio flow figure of authentication embodiment for dactylus line fingerprint refers to vein three mode.
Whether whether S201 detects finger and correctly places, before the authentication images acquired, need to detect finger and correctly place;
Whether S202 only detects finger and correctly could begin authentication after the placement, correctly place otherwise detect finger always;
S203, finger is correct to be placed if detect, and then opens led light source 201 (near-infrared LED light source 101 closed conditions);
S204 opens led light source 201 backs and gathers the dactylus print image through image collecting device 102/202;
S205 closes led light source 201 after having gathered the dactylus print image;
S206 extracts dactylus line characteristic information, before extracting dactylus line characteristic information, also need do necessary Flame Image Process such as image pre-service, figure image intensifying, filtering, binaryzation and refinement;
S207 compares according to the dactylus line characteristic of extracting and the dactylus line feature preset threshold of registration, obtains all users that are higher than setting threshold and gathers N1;
S208 gathers fingerprint image;
S209, the fingerprint image quality assessment specifically is to carry out the fingerprint image quality assessment according to fingerprint image sharpness and the integrity degree gathered, and defines the weight of fingerprint characteristic according to evaluation result;
S210 is like the fingerprint image quality characteristic information that then takes the fingerprint that meets the requirements;
S211 gathers the user and to carry out fingerprint characteristic comparison among the N1 and obtain the user and gather N2;
S212 opens near-infrared LED light source 101;
S213 refers to vein image through image collecting device 102 collections;
S214, evaluation refers to vein image quality;
S215 crosses bright or excessively secretly collection again like image;
S216 is according to image luminance information adjustment light-source brightness and the CMOS register images acquired again of making public;
S217 refers to the sub-piece 607 of vein center according to dactylus line positional information location and shearing;
S218 refers to image processing operations such as vein image enhancing, filtering, normalization and binaryzation;
S219 extracts and to refer to that the vein spectrum signature compares;
S220 gathers the user and to refer to vein pattern comparison among the N2;
S221, if the comparison similarity greater than setting threshold, authentication success then, otherwise authentification failure;
S222, authentication success;
S223, authentification failure;
Above embodiment is unrestricted technical scheme described in the invention and embodiment in order to explanation the present invention only, should be pointed out that for those of ordinary skill in the art to make amendment or replacement on an equal basis to the present invention; And all do not break away from the technical scheme and the improvement thereof of the spirit and scope of the present invention, and it all should be encompassed in the middle of the claim scope of the present invention.
For example, in the above-described embodiments, the fingerprint collecting recognition device is changed to the capacitive transducer fingerprint identification device, or change fingerprint identification device mounting means all can be realized same effect.
Claims (5)
1. multimode authentication device based on finger biologic characteristics is characterized in that: it is by referring to that vein image acquisition module (100), dactylus print image acquisition module (200), fingerprint image acquisition module (300), finger inductive switch (400), embedded SOC authentication module (500), control enclosure (900), IO interface (800) and power module (700) form; Above-mentioned all modules, finger inductive switch and IO interface all are installed on the control enclosure; Refer to that vein image acquisition module (100), dactylus print image acquisition module (200) are connected with the image input interface of fingerprint image acquisition module (300) with embedded SOC authentication module (500); Realize the collection of vein, dactylus line and fingerprint biological characteristic; Finger inductive switch (400) is connected with the GPIO interface of embedded SOC authentication module (500), realizes the detection that finger is placed; Power module (700) is connected with each module and provides work required power supply for each module;
Described finger vein image acquisition module (100); Form by near-infrared LED light supply apparatus (101) and vein image acquisition device (102); The former is placed on control enclosure (900) upper end plate; The latter is placed on control enclosure (900) bottom, and they are connected with embedded SOC authentication module (500), and embedded SOC authentication module (500) is gathered vein image post analysis image; As if crossing bright or crossing and secretly all can adjust the brightness of near-infrared LED light supply apparatus (101) and the time shutter of vein image acquisition device (102) automatically, realize that high-quality near infrared refers to vein train of thought IMAQ; This near-infrared LED light supply apparatus (101) is the near-infrared luminous diode of 850nm, receives light evenly and make full use of light source in order to make finger, be arranged at finger side top and be arranged in parallel successively apart from the general 4-8mm of dorsal surfaces of fingers place, and with point the plane and be predetermined angular; In order to adapt to the finger that thickness varies in size, the near infrared diode light-source brightness is adjustable, is dynamic ON/OFF of PWM mode and brightness regulation through width modulation; For strengthening the optical uniformity that receives of finger the right and left; Be provided with near-infrared light source reflection unit (103); It is placed on the opposite and the control enclosure upper end of near-infrared LED light supply apparatus (101), and parallel with near-infrared LED light supply apparatus (101), has the effect of reflect near infrared light; Strengthen finger and receive optical uniformity, this near-infrared light source reflection unit (103) is mirror or has the material of reflection ray effect; This vein image acquisition device (102) is made up of camera lens, optical filter and CMOS/CCD sensor devices, and the position of optical filter is between camera lens and CMOS/CCD photosensitive sensor; This camera lens adopts common mobile phone or USB cam lens; This optical filter adopts common 850nm bandpass filter, and can only see through wavelength is the near infrared light of 850nm; This CMOS/CCD sensor devices adopts common CMOS or ccd sensor; It is positioned over centre position, control enclosure (900) bottom, is used for gathering finger middle part vein texture image;
Said dactylus print image acquisition module (200); Form by led light source device (201) and dactylus print image harvester (202); They all are installed in the bottom position of control enclosure (900); Its middle finger joint print image harvester (202) can be identical multiplexing with the vein image acquisition device (102) in referring to vein image acquisition module (100), is connected with embedded SOC authentication module (500); This led light source device (201) is made up of light emitting diode, and upwards belly is pointed in irradiation from control enclosure (900) bottom, thereby gathers the dactylus print image through dactylus print image harvester (202);
Said fingerprint image acquisition module (300) adopts existing finger print acquisition module, is connected with embedded SOC authentication module (500);
Said finger inductive switch (400), when promptly need gather fingerprint by one or two inductive switches of capacitance touch when promptly need not gather fingerprint form, be to choose as required; They are positioned over third knuckle (605) and 2-5MM place, first knuckle (601) below respectively, are connected with embedded SOC authentication module (500), can provide high level signal after the correct placement of finger (600);
Said embedded SOC authentication module (500) comprises central processor CPU, internal memory RAM, and storer FLASH parts all are integrated in the chips, form system-on-a-chip, and FLASH is used for stored programme and user characteristics registration data; This module has parallel and two kinds of mode of operations of serial as the main control module of system; Parallel schema is meant that vena identification, finger print identifying and the authentication of dactylus line have independently embedded separately SOC authentication module (500), system's parallel acquisition and authentication vein, fingerprint and dactylus line; Serial mode is meant vein, fingerprint, the shared embedded SOC authentication module of dactylus line (500), and system realizes dactylus line, fingerprint in order and refers to the collection and the authentication of vein;
Said control enclosure (900) is a box box body structure, and all parts of device all are installed on it; Its top is down L shaped structure, is used to install near-infrared luminous diode; The center is provided with the groove of similar finger shape, is used for placing and detecting finger; Its underpart is box shape and is used to install each module, parts and cable;
Said IO interface (800) is USB, UART, GPIO IO interface commonly used;
Said power module (700) has 5V, 3.3V, the output of 1.8 voltages for each module provides work required power supply, specifically is to utilize the 5V power supply of USB and LDO power conversion chip to change.
2. multimode identity authentication method based on finger biologic characteristics is characterized in that: this method comprises characteristic registration and characteristic comparison process;
The concrete steps of characteristic registration are following:
Step 1, system start-up;
Whether step 2 detects finger third knuckle (605) and correctly places;
Step 3, led light source device (201) is opened in the correct back of placing, and gathers the dactylus print image;
Step 4 is extracted dactylus line half-tone information, and is carried out image enhancing, binaryzation and micronization processes, extracts first knuckle line (602) and second knuckle line (604) relative position information, as dactylus line characteristic information; Realize the accurate location of finger position according to dactylus line positional information; Then point out the user to point the placement mistake if extract the failure of first knuckle line and second knuckle line, need reappose;
Step 5 is gathered fingerprint image, analyzes the fingerprint image quality, the characteristic that takes the fingerprint and according to the weight of fingerprint image quality definition fingerprint characteristic;
Step 6 is opened near-infrared LED light supply apparatus (101), gathers to refer to vein image;
Step 7 detects and to refer to vein image, if image cross dark or cross bright then adjust light-source brightness with after the time shutter again collection refer to vein image;
Step 8, shearing refers to the sub-piece of vein center, carries out figure image intensifying, filtering, normalization, binaryzation and refers to that vein pattern extracts;
Step 9 is preserved dactylus line, fingerprint and is referred to vein pattern information;
The concrete steps that aspect ratio is right are following:
Step 1, system start-up;
Whether step 2 detects finger third knuckle (605) and correctly places;
Step 3, led light source device (201) is opened in the correct back of placing, and gathers the dactylus print image;
Step 4 is extracted dactylus line half-tone information, and is carried out image enhancing, binaryzation and micronization processes, extracts first knuckle line (602) and second knuckle line (604) relative position information, realizes the accurate location of finger position according to dactylus line positional information; Then point out the user to point the placement mistake if extract the failure of first knuckle line and second knuckle line, need reappose, precise positioning of fingers effectively improves comparison speed and the authentication precision that refers to vein;
Step 5, it is right to carry out aspect ratio according to the position of each streakline of dactylus line relation and registered user's dactylus line characteristic, and all comparison similarities are gathered N1 greater than the user of setting threshold for the user;
Step 6; Gather fingerprint image, analyze the fingerprint image quality, the characteristic that takes the fingerprint and according to the weight of fingerprint image quality definition fingerprint characteristic; And gather the user and to carry out fingerprint characteristic comparison among the N1, all comparison similarities are gathered N2 greater than the user of setting threshold for the user;
Step 7 is opened near-infrared LED light supply apparatus (101), gathers to refer to vein image;
Step 8 detects and to refer to vein image, if image cross dark or cross bright then adjust light-source brightness with after the time shutter again collection refer to vein image;
Step 9 is sheared and to be referred to the sub-piece of vein center, and carry out figure image intensifying, filtering, normalization, binaryzation and refer to that vein pattern extracts, and gather the user and to carry out the vein pattern comparison among the N2, if the comparison similarity is then compared success greater than setting threshold, otherwise the comparison failure.
3. a kind of multimode authentication device based on finger biologic characteristics according to claim 1 is characterized in that: the quantity of this near-infrared luminous diode is 4-8.
4. a kind of multimode authentication device based on finger biologic characteristics according to claim 1 is characterized in that: the quantity of this light emitting diode is 2-4.
5. a kind of multimode authentication device based on finger biologic characteristics according to claim 1 is characterized in that: the luminous angle of this near-infrared luminous diode and finger plane are the predetermined angular of 1/2-1/3.
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Application publication date: 20120704 |