CN110287866A - Ultrasonic fingerprint recognition methods, device, storage medium and electronic equipment - Google Patents
Ultrasonic fingerprint recognition methods, device, storage medium and electronic equipment Download PDFInfo
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- CN110287866A CN110287866A CN201910550285.9A CN201910550285A CN110287866A CN 110287866 A CN110287866 A CN 110287866A CN 201910550285 A CN201910550285 A CN 201910550285A CN 110287866 A CN110287866 A CN 110287866A
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- reflection signal
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
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Abstract
The embodiment of the present application provides a kind of ultrasonic fingerprint recognition methods, device, storage medium and electronic equipment, and ultrasonic fingerprint recognition methods includes: to be instructed according to fingerprint recognition when receiving fingerprint recognition instruction and send ultrasonic signal；Receive the reflection signal that ultrasonic wave is formed after barrier obstruction；The corresponding acoustic resistance characteristic information of barrier is determined according to reflection signal；Corresponding fingerprint recognition result is determined according to acoustic resistance characteristic information.With this, fingerprint can be identified according to human finger distinctive acoustic resistance characteristic information, avoid as illegal fingerprint attack and caused by fingerprint recognition mistake, be greatly improved the accuracy of fingerprint recognition.
Description
Technical field
This application involves electronic technology field, in particular to a kind of ultrasonic fingerprint recognition methods, device, storage medium and
Electronic equipment.
Background technique
With the development of electronic technology, the electronic equipments such as smart phone use ground increasingly frequency in user's life
It is numerous.For example, user can realize social functions, shopping function, payment function etc. by electronic equipment.To which user is to electricity
The security requirement of sub- equipment is also higher and higher.
In general, being provided with Fingerprint Lock on electronic equipment, verified for the identity to user, to ensure that user uses electricity
The safety of sub- equipment.However, the Fingerprint Lock on electronic equipment sometimes will receive the attack of illegal fingerprint, the illegal fingerprint
Such as may include printing paper fingerprint and silica gel fingerprint etc., the accuracy that user fingerprints identify is dropped so as to cause electronic equipment
It is low.
Summary of the invention
The embodiment of the present application provides a kind of ultrasonic fingerprint recognition methods, device, storage medium and electronic equipment, Ke Yiti
The accuracy of high fingerprint recognition.
The embodiment of the present application provides a kind of ultrasonic fingerprint recognition methods, comprising:
When receiving fingerprint recognition instruction, is instructed according to the fingerprint recognition and send ultrasonic signal；
Receive the reflection signal that the ultrasonic wave is formed after barrier obstruction；
The corresponding acoustic resistance characteristic information of barrier is determined according to the reflection signal；
Corresponding fingerprint recognition result is determined according to the acoustic resistance characteristic information.
The embodiment of the present application also provides a kind of ultrasonic fingerprint identification device, comprising:
Transmitting module, for being instructed according to the fingerprint recognition and sending ultrasonic wave letter when receiving fingerprint recognition instruction
Number；
Receiving module, the reflection signal formed after barrier obstruction for receiving the ultrasonic wave；
First determining module, for determining the corresponding acoustic resistance characteristic information of barrier according to the reflection signal；
Second determining module, for determining corresponding fingerprint recognition result according to the acoustic resistance characteristic information.
The embodiment of the present application also provides a kind of storage medium, computer program is stored in the storage medium, when described
When computer program is run on computers, so that the computer executes above-mentioned ultrasonic fingerprint recognition methods.
The embodiment of the present application also provides a kind of electronic equipment, including processor and memory, is stored in the memory
Computer program, the processor are above-mentioned super for executing by calling the computer program stored in the memory
Sound wave fingerprint identification method.
Ultrasonic fingerprint recognition methods provided by the embodiments of the present application, comprising: when receiving fingerprint recognition instruction, according to
Fingerprint recognition instruction sends ultrasonic signal；Receive the reflection signal that ultrasonic wave is formed after barrier obstruction；Believed according to reflection
Number determine the corresponding acoustic resistance characteristic information of barrier；Corresponding fingerprint recognition result is determined according to acoustic resistance characteristic information.Ultrasound
In wave fingerprint identification method, with this, fingerprint can be identified according to human finger distinctive acoustic resistance characteristic information, avoid by
In illegal fingerprint attack and caused by fingerprint recognition mistake, be greatly improved the accuracy of fingerprint recognition.
Detailed description of the invention
In order to more clearly explain the technical solutions in the embodiments of the present application, make required in being described below to embodiment
Attached drawing is briefly described.It should be evident that the drawings in the following description are only some examples of the present application, for
For those skilled in the art, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is the first structural schematic diagram of electronic equipment provided by the embodiments of the present application.
Fig. 2 is the cross-sectional view of the ultrasonic sensor in electronic equipment provided by the embodiments of the present application.
Fig. 3 is cross-sectional view of the display screen in electronic equipment shown in Fig. 1 along the direction Q-Q.
Fig. 4 is the schematic illustration that ultrasonic sensor provided by the embodiments of the present application carries out fingerprint recognition.
Fig. 5 is the first flow diagram of ultrasonic fingerprint recognition methods provided by the embodiments of the present application.
Fig. 6 is second of flow diagram of ultrasonic fingerprint recognition methods provided by the embodiments of the present application.
Fig. 7 is the first structural schematic diagram of ultrasonic fingerprint identification device provided by the embodiments of the present application.
Fig. 8 is second of structural schematic diagram of ultrasonic fingerprint identification device provided by the embodiments of the present application.
Fig. 9 is second of structural schematic diagram of electronic equipment provided by the embodiments of the present application.
Figure 10 is the third structural schematic diagram of electronic equipment provided by the embodiments of the present application.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description.Obviously, described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, those skilled in the art's every other implementation obtained under that premise of not paying creative labor
Example, belongs to the protection scope of the application.
The embodiment of the present application provides a kind of electronic equipment.The electronic equipment can be smart phone, tablet computer etc. and set
It is standby, can also be game station, AR (Augmented Reality, augmented reality) equipment, automotive fittings, data storage device,
Audio playing apparatus, video play device, laptop, Desktop computing device etc..
With reference to Fig. 1, Fig. 1 is the first structural schematic diagram of electronic equipment provided by the embodiments of the present application.Electronic equipment 10
Including display screen 11, cover board 12, center 13, circuit board 14, battery 15 and rear cover 16.
Wherein, display screen 11 may be mounted on center 13, and be connected to rear cover 16 by center 13, be set with forming electronics
Standby 10 display surface, for showing the information such as image, text.Meanwhile display screen 11 can be used as the front housing of electronic equipment 10.Its
In, display screen 11 can be liquid crystal display (Liquid Crystal Display, LCD) or organic light-emitting diode (OLED) display screen
(Organic Light-Emitting Diode, OLED).
Cover board 12 may be mounted on center 13, and cover board 12 covers the display screen 11, to carry out to display screen 11
Protection, prevents display screen 11 to be scraped off or by Water Damage.Wherein, cover board 12 can be transparent glass cover plate, so that user can
To observe the content of the display of display screen 11 through cover board 12.It should be understood that cover board 12 can be the glass of sapphire material
Cover board.
Center 13 can be lamellar or laminar structure, or hollow frame structure.Center 13 is for being
Electronic component or functional unit in electronic equipment 10 provide a supporting role, by the electronic component in electronic equipment, functional group
Part is mounted together.
Wherein, the shell of electronic equipment 10 can be collectively formed in display screen 11, center 13 and rear cover 16, for accommodate or
Electronic component, the functional unit etc. of electronic equipment are installed.For example, camera, receiver in electronic equipment, circuit board, sensing
The functional units such as device, battery can be installed on center 13 to be fixed.It should be understood that the material of center 13 can wrap
Include metal or plastic cement.
Circuit board 14 may be mounted on center 13.Circuit board 14 can be the mainboard of electronic equipment 10.On circuit board 14
It is provided with grounding point, to realize the ground connection of circuit board 14.Microphone, loudspeaker, receiver, ear are can integrate on circuit board 14
One in the functional units such as machine interface, camera, acceleration transducer, ambient light sensor, gyroscope and processor or
It is multiple.Meanwhile display screen 11 can be electrically connected to circuit board 14.
Battery 15 may be mounted on center 13.Meanwhile battery 15 is electrically connected to the circuit board 14, to realize battery 15
For the power supply of electronic equipment 10.Wherein, electric power management circuit can be set on circuit board 14.The electric power management circuit is used for will
The voltage that battery 15 provides is assigned to each electronic component in electronic equipment 10.
Rear cover 16 can be integrally formed.In the forming process of rear cover 16, rear camera can be formed on rear cover 16
The structures such as hole.
It should be understood that fingerprint Identification sensor can be set in the electronic equipment 10.In the embodiment of the present application, institute
Fingerprint Identification sensor is stated by ultrasonic sensor to realize.The ultrasonic sensor can be set in electronic equipment 10
Portion, such as the ultrasonic sensor may be mounted on the center 13 of electronic equipment 10.The ultrasonic sensor is for adopting
Collect the fingerprint of user, and the fingerprint of user is identified, to ensure that user uses the safety of electronic equipment.
With reference to Fig. 2, Fig. 2 is the cross-sectional view of the ultrasonic sensor 20 in electronic equipment 10 provided by the embodiments of the present application.
Wherein, ultrasonic sensor 20 includes control circuitry layer 21, positive electrode layer 22, piezoelectric material layer 23, positive electrode layer
24 and fixing layer 25.The control circuitry layer 21, positive electrode layer 22, piezoelectric material layer 23, positive electrode layer 24 and fixing layer
25 are cascading.
The control circuitry layer 21 is used to control ultrasonic sensor 20, such as control ultrasonic sensor 20 is sent out
It penetrates ultrasonic signal and controls the reflection signal that ultrasonic sensor 20 receives barrier.Wherein, the control circuitry layer 21
It may include the connection electricity between multiple thin film transistor (TFT)s (Thin Film Transistor, TFT) and the multiple TFT
Road.
The positive electrode layer 22 constitutes two electrodes of the piezoelectric material layer 23 with the positive electrode layer 24, so as to
Voltage is applied to the piezoelectric material layer 23 by the positive electrode layer 22 and the positive electrode layer 24.Wherein, the positive electrode
Layer 24 can be silver slurry layer.
The piezoelectric material layer 23 is used to generate ultrasonic signal and receive the reflection signal of barrier.Wherein, described
Piezoelectric material layer 23 includes piezoelectric material, and the piezoelectric material for example can be piezoelectric ceramics.
Apply high frequency when applying alternating voltage on the piezoelectric material layer 23, such as on the piezoelectric material layer 23
When oscillator signal, the piezoelectric material layer 23 can produce ultrasonic signal, and outwardly emit ultrasonic signal.When the pressure
On material layer 23 when no applied voltage, the piezoelectric material layer 23 can receive the ultrasonic signal of extraneous barrier reflection,
And the reflection signal received is converted into corresponding electric signal, to realize the identification to reflection signal.
The fixing layer 25 is for being fixed ultrasonic sensor 20, to realize the ultrasonic sensor 20 in electricity
Installation in sub- equipment 10.For example, the fixing layer 25 can be colloid layer.
It should be understood that in order to reduce ultrasonic sensor to the occupancy in electronic equipment internal space, or in order to enhance
Ultrasonic sensor is emitted to the intensity of extraneous ultrasonic signal, and ultrasonic sensor can also be integrated into electronic equipment 10
Display screen 11 in.
It is cross-sectional view of the display screen 11 in electronic equipment 10 shown in Fig. 1 along the direction Q-Q with reference to Fig. 3, Fig. 3.Wherein, ultrasonic
Wave sensor is integrated in display screen 11.
Display screen 11 includes the top glass substrate 11a being cascading, ultrasonic sensor control circuitry layer 11b, bears
Electrode layer 11c, luminescent layer 11d, piezoelectric material layer 11e, positive electrode layer 11f, fixing layer 11g and lower glass substrate 11h.Its
In, the top glass substrate 11a, luminescent layer 11d, lower glass substrate 11h for realizing display screen display function；The ultrasound
Wave sensor control circuitry layer 11b, positive electrode layer 11c, piezoelectric material layer 11e, positive electrode layer 11f, fixing layer 11g for realizing
Ultrasonic sensor emits ultrasonic signal and receives the function of reflection signal, to realize ultrasonic sensor in display screen
In it is integrated.
The glass substrate of top glass substrate 11a, lower glass substrate 11h as 11 two sides of display screen, for its of display screen 11
Its layer structure provides a supporting role, or is interpreted as other layer structures of display screen 11 and can be set in the upper glass base
On plate 11a and lower glass substrate 11h.Luminescent layer 11d is for shining or penetrating light, so that the display letter of display screen 11
Breath.For example, when display screen 11 is liquid crystal display (Liquid Crystal Display, LCD), the luminescent layer 11d packet
Include liquid crystal layer；When display screen 11 is organic light-emitting diode (OLED) display screen (Organic Light-Emitting Diode, OLED)
When, the luminescent layer 11d includes organic luminous layer.
The ultrasonic sensor control circuitry layer 11b is used to carry out the ultrasonic sensor being integrated in display screen 11
Control, such as control ultrasonic sensor transmitting ultrasonic signal and the reflection letter for controlling ultrasonic sensor reception barrier
Number.It is generated it should be understood that the ultrasonic sensor control circuitry layer 11b can be used for controlling the piezoelectric material layer 11e
Ultrasonic signal or the reflection signal for receiving barrier.
The positive electrode layer 11c, positive electrode layer 11f constitute two electrodes of the piezoelectric material layer 11e, thus to described
Piezoelectric material layer 11e applies voltage.Wherein, the positive electrode layer 11f can be silver slurry layer.
The piezoelectric material layer 11e is used to generate ultrasonic signal and receive the reflection signal of barrier.Wherein, described
Piezoelectric material layer 11e includes piezoelectric material, and the piezoelectric material for example can be piezoelectric ceramics.
The fixing layer 11g is for being fixed ultrasonic sensor.For example, the fixing layer 11g will be for will be described
Positive electrode layer 11f is fixed on the lower glass substrate 11h.
Wherein, the ultrasonic sensor control circuitry layer 11b, positive electrode layer 11c, piezoelectric material layer 11e, positive electrode layer
11f, fixing layer 11g can also be with reference to above to control circuitry layer 21, positive electrode layer 22, piezoelectric material layers 23, positive electrode layer
24 and fixing layer 25 description.
It should be understood that display screen 11 can also include one or more polaroids, one or more colored filters, one
The structures such as a or multiple display screen driving electrodes and one or more display panel control circuits.The polaroid, colored filter,
Display screen driving electrodes, display panel control circuit are also used for realizing the display function of display screen.For example, the polaroid for pair
The light that display screen issues is polarized, and the light that the colored filter is used to issue display screen carries out color filtration, institute
Display screen driving electrodes are stated for driving signals such as display screen input data signal, scanning signals, the display screen control to be electric
Road is for controlling display screen.Wherein, the display panel control circuit may include multiple TFT and the multiple TFT
Between connection circuit.
Wherein, the ultrasonic sensor control circuitry layer 11b in display screen 11 and display panel control circuit can also be replaced
Control circuit for the control circuit and display screen of a control circuit namely ultrasonic sensor shares a control circuit.
It is thus possible to avoid that multiple control circuits are arranged inside display screen, the arrangement space utilization rate inside display screen can be improved.
For example, the control to ultrasonic sensor can both have been realized by the ultrasonic sensor control circuitry layer 11b,
The control to display screen is realized again.Wherein, the ultrasonic sensor control circuitry layer 11b can be realized by subregion to super
The co- controlling namely a part of circuit in the ultrasonic sensor control circuitry layer 11b of sonic sensor and display screen
For realizing the control to ultrasonic sensor, another part circuit is for realizing the control to display screen.
With reference to Fig. 4, Fig. 4 is the schematic illustration that ultrasonic sensor provided by the embodiments of the present application carries out fingerprint recognition.
Wherein, when the contact of the finger of user or pressing are at electronic equipment surface (such as display screen surface), electronics is set
Standby control ultrasonic sensor emits ultrasonic signal towards the direction of finger.Ultrasonic signal is generated when touching finger
Reflect signal.Reflection signal reflexes at ultrasonic sensor again, is received by ultrasonic sensor.Then, ultrasonic sensor
The reflection signal received is converted into corresponding electric signal, the fingerprint image of user's finger can be obtained.
It should be understood that there are fingerprint patterns for finger surface, and fingerprint pattern is formed by rough region.Cause
This, when the different zones of fingerprint pattern reflect ultrasonic wave signal formation reflection signal, the intensity for reflecting signal is different, ultrasound
The intensity that wave sensor receives the reflection signal of finger different parts is also different.To which ultrasonic sensor can root
The concave-convex degree that finger different parts are obtained according to the reflected signal strength of finger different parts, can form the three of user's finger
Tie up fingerprint image.
For example, the most deep position that is recessed in fingerprint pattern is properly termed as fingerprint valley, the highest position of fingerprint pattern protrusions
It is properly termed as fingerprint ridge.When user's finger, which reflects ultrasonic wave signal, generates reflection signal, signal is reflected caused by fingerprint valley
Intensity be it is most weak, reflected signal strength caused by fingerprint ridge is strongest.Ultrasonic sensor is according to the finger received
Reflected signal strength caused by different parts is the fingerprint valley and fingerprint ridge that may recognize that on finger.
Although ultrasonic sensor can form the three-dimensional fingerprint image of user's finger, illegal user can still make
The 3D prosthetic finger of simulation actual fingerprint is made with materials such as silica gel, therefore, can also be formed by 3D prosthetic finger and user's finger
Identical three-dimensional fingerprint image realizes illegal operation, and the application is different using the acoustic resistance characteristic that ultrasonic wave penetrates unlike material, very
Skin and imitation leather skin are all different to the reflected intensity of ultrasonic wave entirety and reflection interval, thus identify true and false finger, relative to
Traditional fingerprint identification method, is greatly improved safety.
The embodiment of the present application provides a kind of ultrasonic fingerprint recognition methods, and the ultrasonic fingerprint recognition methods can apply
In above-mentioned electronic equipment 10.
With reference to Fig. 5, Fig. 5 is the first flow diagram of ultrasonic fingerprint recognition methods provided by the embodiments of the present application.
Wherein, the ultrasonic fingerprint recognition methods the following steps are included:
101, when receiving fingerprint recognition instruction, is instructed according to fingerprint recognition and send ultrasonic signal.
Wherein, electronic equipment instructs control ultrasonic wave to pass when receiving fingerprint recognition instruction according to the fingerprint recognition
Sensor emits ultrasonic signal.Fingerprint recognition instruction can be to be generated when user attempts and unlocks to electronic equipment,
It can be and generated when user attempts operation encryption application or opens encryption file.
For example, when user's finger contacts are perhaps pressed into the display screen of electronic equipment or when electronic equipment is in screen locking
When being lit display screen under state, or when user runs the encryption on electronic equipment in application, the processor of electronic equipment is raw
It is instructed at fingerprint recognition.Then, electronic equipment receives fingerprint recognition instruction, and instructs control ultrasonic wave according to the fingerprint recognition
Sensor emission ultrasonic signal.
102, receive the reflection signal that ultrasonic wave is formed after barrier obstruction.
Wherein, after emitting ultrasonic signal, the ultrasonic signal can pass through aobvious the ultrasonic sensor of electronic equipment
Display screen, and corresponding barrier is touched, which can be finger, printing paper fingerprint or the silica gel fingerprint etc. of user
It will form corresponding reflection signal after barrier reflection Deng, the ultrasonic signal.
Then, the ultrasonic sensor in electronic equipment receives the reflection signal of reflection, and the reflection signal is converted
For corresponding electric signal, electronic equipment can get the fingerprint image of user's finger, the fingerprint image according to the electric signal
As three-dimensional fingerprint image.
It should be noted that the three-dimensional fingerprint image that gets of electronic equipment is 3-D image, and pass through such as camera
The accessed two-dimentional fingerprint image of equal optical instruments shooting is different.The three-dimensional fingerprint image not only includes fingerprint image,
It further include the concave-convex degree of every bit in fingerprint image.Wherein, the concave-convex degree is it can be appreciated that in the fingerprint pattern
Relative altitude or relative distance of the every bit relative to same reference planes.
103, the corresponding acoustic resistance characteristic information of barrier is determined according to reflection signal.
Wherein, although what electronic equipment got is three-dimensional fingerprint image, if illegal user is using imitating user
When the silica gel fingerprint of finger is verified, identical three-dimensional fingerprint image can be also got accordingly, and then crack electronic equipment
Fingerprint authentication, cause strong influence to the information security of user.Therefore, the embodiment of the present application is in addition to three-dimensional fingerprint image
It is verified, can also further be verified according to the corresponding acoustic resistance characteristic information of barrier.
Correspondingly, if the material of barrier is different, if finger skin is different from the material of silica gel, then for ultrasonic wave
Reflectivity be certainly it is different, so the barrier of different materials have different acoustic resistance characteristic informations.Even phase
Same skin histology, since two different person-to-person constitutions are different, reflectivity of the ultrasonic wave in the skin of different people
Fine distinction is had, so the finger of different people has different acoustic resistance characteristic informations, it is possible to according to the reflection
Signal determines the distinctive acoustic resistance characteristic information of barrier.
In some embodiments, the step of this determines barrier corresponding acoustic resistance characteristic information according to reflection signal,
May include:
(1) corresponding reflectivity is determined according to the signal strength indication of the reflection signal；
(2) the acoustic impedance information of barrier is determined based on the reflectivity；
(3) corresponding delayed data is determined according to the receiving time of the reflection signal；
(4) the acoustic impedance information and delayed data are determined as corresponding acoustic resistance characteristic information.
Wherein, the reflectivity is related to the reflection signal strength indication of signal, is that ultrasonic signal is passing through display screen, passes through
The reflection efficiency of the reflection signal of ultrasonic sensor is returned to after barrier reflection, the signal strength indication of the reflection signal is bigger,
The reflectivity is higher, and the intensity value of the reflection signal is smaller, and the reflectivity is lower.
Further, after corresponding reflectivity has been determined, the corresponding sound of barrier can be determined according to the following formula
Impedance information:
Wherein, which is reflectivity, Z1Represent the acoustic impedance information of display screen, Z2The acoustic impedance information for representing barrier, by
It is determined in reflectivity η, Z1It can determine according to the following formula:
Z=ρ υ
Wherein Z is acoustic impedance information, and p is the density of the material of object, and V is spread speed of the ultrasonic wave in material, Z1
It is determined as display screen, the material of display screen is determining, such as glass, then the density of the material of display screen and ultrasonic wave are aobvious
Spread speed in display screen material can determine, correspondingly, Z1Numerical value also it was determined that in Z1It is all determined with reflectivity η
In the case of, the acoustic impedance information Z of barrier can be calculated2。
It is then, certainly also different for the reflex response time of ultrasonic wave since the material of different barriers is different,
For example, different media is all different for ultrasonic propagation velocity, it is as shown in table 1 below:
| Medium | Air | Finger skin | Silica gel | Glass |
| Spread speed m/s | 343 | 1600 | 1000 | 5100 |
Table 1
As shown in table 1, the medium of different barriers is different for ultrasonic propagation velocity, and in the embodiment of the present application
Ultrasonic signal is all to initially pass through display screen, touches corresponding barrier, and corresponding transmitting is formed after barrier reflects
Signal, on the basis of passing through the time determination of display screen, different barriers affirm not the reflex response time of ultrasonic wave
Equally, for example, finger skin is faster than silica gel for the reflex response time of ultrasonic wave for the reflex response time of ultrasonic wave.Cause
This, receiving time when sending time and reflection signal when can be sent according to ultrasonic signal receive is determined to prolong accordingly
When information.
Finally, the acoustic impedance information and delayed data can be determined as acoustic resistance characteristic information.
104, corresponding fingerprint recognition result is determined according to acoustic resistance characteristic information.
Wherein, since the material of different barriers is different, so corresponding acoustic resistance characteristic information is certainly different, therefore,
It can be corresponding to determine according to the default acoustic resistance characteristic information matching whether corresponding with user preset finger of acoustic resistance characteristic information
Fingerprint recognition as a result, when the default acoustic resistance characteristic information matching corresponding with user preset finger of acoustic resistance characteristic information, work as by explanation
Preceding barrier is user preset finger, and fingerprint recognition passes through.When acoustic resistance characteristic information default sound corresponding with user preset finger
When hindering characteristic information and mismatching, illustrating current barrier not is user preset finger, even if the barrier three-dimensional fingerprint accordingly
Image is matched with the three-dimensional fingerprint image of user preset, is also determined as that fingerprint recognition fails.
In some embodiments, the step of this determines corresponding fingerprint recognition result according to acoustic resistance characteristic information, can be with
Include:
(1) when the similarity for detecting the acoustic impedance information and default acoustic impedance information is greater than the first preset threshold,
The difference of the delayed data and default delayed data is detected whether less than the second preset threshold；
(2) when detecting the difference of the delayed data and default delayed data less than the second preset threshold, determination refers to
Line identifies successfully；
(3) when detect the similarity of the acoustic impedance information and default acoustic impedance information no more than the first preset threshold or
When detecting the difference of the delayed data and default delayed data not less than the second preset threshold, determine that fingerprint recognition is lost
It loses.
Wherein, electronic equipment can shift to an earlier date corresponding target acoustic impedance information when passing through according to the fingerprint authentication of target user
With target delayed data, and according to the target acoustic impedance information and the setting of target delayed data accordingly default acoustic impedance information and
Default delayed data.
Further, when the similarity of detection acoustic impedance information and default acoustic impedance information is greater than the first preset threshold
When, illustrate the corresponding acoustic impedance information of current barrier and default acoustic impedance information matches, executes detection delay information and pre-
If whether the difference of delayed data is less than the second preset threshold, when detecting that delayed data and the difference of default delayed data be less than
When the second preset threshold, fingerprint recognition success is determined.When detection acoustic impedance information and default acoustic impedance information similarity not
Greater than the first preset threshold or when detecting that delayed data and face penetrate the difference of delayed data not less than the second preset threshold, really
It is set to fingerprint recognition failure.
In the embodiment of the present application, electronic equipment is sent super when receiving fingerprint recognition instruction according to fingerprint recognition instruction
Acoustic signals；Receive the reflection signal that ultrasonic wave is formed after barrier obstruction；Determine that barrier is corresponding according to reflection signal
Acoustic resistance characteristic information；Corresponding fingerprint recognition result is determined according to acoustic resistance characteristic information.It, can be according to human finger spy with this
Some acoustic resistance characteristic informations identify fingerprint, avoid attacking as illegal fingerprint and caused by fingerprint recognition mistake, greatly
Improve the accuracy of fingerprint recognition.
With reference to Fig. 6, Fig. 6 is second of flow diagram of ultrasonic fingerprint recognition methods provided by the embodiments of the present application.
201, when the fingerprint authentication for detecting target user passes through, record the corresponding target acoustic resistance of fingerprint of target user
Anti- information and target delayed data preset acoustic impedance information according to the setting of the target acoustic impedance information of record, according to note accordingly
Delayed data is preset in the target delayed data setting of record accordingly.
Wherein, electronic equipment can establish the corresponding acoustic impedance information of ultrasonic wave and the corresponding intensified learning of delayed data
Library, i.e. early period can automatically record the corresponding mesh of fingerprint of target user when the fingerprint authentication for detecting target user passes through
It marks acoustic impedance information and target delayed data is added in intensified learning library, which can be one week, two weeks or one
Month etc..
Further, default acoustic impedance information accordingly can be set according to the target acoustic impedance information of record, such as
The target acoustic impedance information of record takes median, obtains presetting acoustic impedance information accordingly, according to the target delayed data of record
Delayed data is preset in setting accordingly, such as takes median for the target acoustic impedance information of record, obtains default delay accordingly
Information.
202, when receiving fingerprint recognition instruction, is instructed according to fingerprint recognition and send ultrasonic signal.
Wherein, when electronic equipment is in screen lock state or when user needs to open the encryption file on electronic equipment,
It can generate and receive fingerprint recognition instruction accordingly, then, electronic equipment can instruct control ultrasound according to the fingerprint recognition
Wave sensor emits ultrasound information.
203, receive the reflection signal that ultrasonic wave is formed after barrier obstruction.
Wherein, for the ultrasonic sensor of electronic equipment after emitting ultrasonic signal, which can pass through display
Screen, and touch corresponding barrier and form corresponding reflection signal, subsequent ultrasonic sensor can receive this accordingly
Reflect signal.
204, according to reflection signal acquisition three-dimensional fingerprint image.
Wherein, there are fingerprint patterns for finger surface, and fingerprint pattern is formed by rough region.Therefore, refer to
When the different zones of line pattern reflect ultrasonic wave signal formation reflection signal, the intensity for reflecting signal is different, and ultrasonic wave passes
The intensity that sensor receives the reflection signal of finger different parts is also different.To which ultrasonic sensor can be according to hand
Refer to the reflected signal strength of different parts to obtain the concave-convex degree of finger different parts, the three-dimensional that can form user's finger refers to
Print image.
205, judge whether three-dimensional fingerprint image and the similarity of default three-dimensional fingerprint image are greater than third predetermined threshold value.
Wherein, a third predetermined threshold value can be preset in electronic equipment.The third predetermined threshold value is current barrier
Hinder the similar threshold value of the three-dimensional fingerprint image of object default three-dimensional fingerprint image corresponding with default finger, which can
It is determined to be rule of thumb configured, or after sampling analysis can also being carried out to a certain amount of user.For example, the third is pre-
If similarity threshold can be 85%.
Further, when electronic equipment judges that the similarity of three-dimensional fingerprint image and default three-dimensional fingerprint image is greater than the
When three preset thresholds, illustrates that three-dimensional fingerprint image is matched with default three-dimensional fingerprint image, execute step 206.When electronic equipment is sentenced
When the similarity of disconnected fingerprint image three-dimensional out and default three-dimensional fingerprint image is no more than third predetermined threshold value, illustrate three-dimensional fingerprint image
As mismatching with default three-dimensional fingerprint image, fingerprint authentication failure executes step 211.
206, corresponding reflectivity is determined according to the signal strength indication of reflection signal, barrier is determined based on reflectivity
Acoustic impedance information.
Wherein, in existing fingerprint identification technology, when electronic equipment judges that three-dimensional fingerprint image refers to default three-dimensional
When the similarity of print image is greater than third predetermined threshold value, it can be determined as that fingerprint recognition passes through.And in the embodiment of the present application, even if
When the similarity that electronic equipment judges three-dimensional fingerprint image and presets three-dimensional fingerprint image is greater than third predetermined threshold value, can hold
Row determines the corresponding reflectivity of current barrier according to the signal strength indication of reflection signal, and determines obstacle based on reflectivity
The acoustic impedance information of object.
207, sending time when ultrasonic signal is sent is obtained, receiving time when reflection signal receives is obtained, according to
Receiving time calculates the corresponding time difference with sending time, and the time difference will be determined as delayed data, by acoustic impedance information and
Delayed data is determined as corresponding acoustic resistance characteristic information.
Wherein, sending time when the available ultrasonic signal of electronic equipment is sent, such as 17 points 50 seconds 02 minute, obtain anti-
Penetrate signal receive when receiving time, such as 17 points 51 seconds 02 minute, the corresponding time is calculated with sending time according to receiving time
Difference is 1 second, and 1 second time difference was determined as delayed data, and by the corresponding acoustic impedance information of current barrier and delayed data
It is determined as acoustic resistance characteristic information.
208, whether detection acoustic impedance information and the similarity of default acoustic impedance information are greater than the first preset threshold.
Wherein, first preset threshold can be preset in electronic equipment.First preset threshold is current barrier
Hinder the similar threshold value of the acoustic impedance information of object default acoustic impedance information corresponding with default finger, which can root
It is configured according to experience, or is determined after sampling analysis can also being carried out to a certain amount of user.For example, the first default phase
It can be 90% like degree threshold value.
Further, since the material of different barriers has different acoustic impedance information, it is possible to which detection is current
Whether the similarity of the acoustic impedance information of barrier and default acoustic impedance information is greater than the first preset threshold, when detecting acoustic impedance
When the similarity of information and default acoustic impedance information is greater than the first preset threshold, illustrates that acoustic impedance Information Authentication passes through, execute step
Rapid 209.When detecting the similarity of acoustic impedance information and default acoustic impedance information no more than the first preset threshold, illustrate acoustic resistance
Anti- Information Authentication does not pass through, and executes step 211.
209, whether the difference of detection delay information and default delayed data is less than the second preset threshold.
Wherein, second preset threshold can be preset in electronic equipment.First preset threshold is current barrier
Hinder the differential threshold of the delayed data of object default delayed data corresponding with default finger, which can be according to warp
It tests and is configured, or determined after sampling analysis can also being carried out to a certain amount of user.For example, second preset threshold can
Think 0.1 second.
It is said with this when the similarity for detecting acoustic impedance information and default acoustic impedance information is greater than the first preset threshold
Bright acoustic impedance Information Authentication passes through, since reflex response time of the different barriers for ultrasonic wave is different, further, also
Whether need to detect the delayed data of current barrier and the difference of default delayed data less than the second preset threshold, when detecting
When the difference of delayed data and default delayed data is less than the second preset threshold, execute step 210, when detect delayed data with
When the difference of default delayed data is not less than the second preset threshold, step 211 is executed.
210, determine fingerprint recognition success.
Wherein, judge that the similarity of three-dimensional fingerprint image and default three-dimensional fingerprint image is pre- greater than third in electronic equipment
If threshold value, illustrate that the fingerprint pattern on current barrier is matched with the fingerprint pattern on user preset finger, further, this Shen
Please embodiment also need to carry out certain verifying to the material of barrier, in the acoustic impedance information and delayed data of current barrier
When all eligible, illustrate that the material of barrier is also matched with the material of user preset finger, just can determine whether fingerprint recognition success,
Prevent the possibility that illegal user carries out fingerprint recognition using such as printing paper fingerprint and silica gel fingerprint, improves fingerprint recognition
Safety.
211, determine that fingerprint recognition fails.
Wherein, when any ineligible among three-dimensional fingerprint image, acoustic impedance information or delayed data, all determine
Fail for fingerprint recognition, in one embodiment, in order to preferably protect the safety of electronic equipment, in three-dimensional fingerprint image and in advance
If being regarded as illegal when three-dimensional fingerprint image successful match, and when one of acoustic impedance information or delayed data are ineligible
User is used imitated article and carries out unlocked by fingerprint, can control electronic equipment and is alarmed accordingly, and opens preposition
The face image of camera shooting illegal user.
In the description of the present application, it is to be understood that the terms such as " first ", " second " are only used for distinguishing similar
Object is not understood to indicate or imply relative importance or implicitly indicates the quantity of indicated technical characteristic.
When it is implemented, the application is not limited by the execution sequence of described each step, conflict is not being generated
In the case of, certain steps can also be carried out using other sequences or be carried out simultaneously.
From the foregoing, it will be observed that ultrasonic fingerprint recognition methods provided by the embodiments of the present application, comprising: refer to receiving fingerprint recognition
When enabling, is instructed according to fingerprint recognition and send ultrasonic signal；Receive the reflection signal that ultrasonic wave is formed after barrier obstruction；Root
The corresponding acoustic resistance characteristic information of barrier is determined according to reflection signal；Corresponding fingerprint recognition knot is determined according to acoustic resistance characteristic information
Fruit.It can also be distinctive according to human finger while being verified by current three-dimensional fingerprint image to fingerprint with this
Acoustic resistance characteristic information and delayed data further identify finger material, avoid attacking as illegal fingerprint and caused by finger
Line identifies mistake, is greatly improved the accuracy of fingerprint recognition.
The embodiment of the present application also provides a kind of ultrasonic fingerprint identification device, and the ultrasonic fingerprint identification device can collect
At in above-mentioned electronic equipment 10.
With reference to Fig. 7, Fig. 7 is the structural schematic diagram of ultrasonic fingerprint identification device provided by the embodiments of the present application.Wherein, institute
State ultrasonic fingerprint identification device 300 include: transmitting module 301, receiving module 302, the first determining module 303 and second really
Cover half block 304.
Transmitting module 301, for being instructed according to the fingerprint recognition and sending ultrasonic wave when receiving fingerprint recognition instruction
Signal.
Wherein, transmitting module 301 instructs control ultrasonic wave according to the fingerprint recognition when receiving fingerprint recognition instruction
Sensor emission ultrasonic signal.Fingerprint recognition instruction can be to be generated when user attempts and unlocks to electronic equipment,
It is also possible to generate when user attempts operation encryption application or opens encryption file.
For example, when user's finger contacts are perhaps pressed into the display screen of electronic equipment or when electronic equipment is in screen locking
When being lit display screen under state, or when user runs the encryption on electronic equipment in application, the processor of electronic equipment is raw
It is instructed at fingerprint recognition.Then, transmitting module 301 receives fingerprint recognition instruction, and super according to fingerprint recognition instruction control
Sonic sensor emits ultrasonic signal.
Receiving module 302, the reflection signal formed after barrier obstruction for receiving the ultrasonic wave.
Wherein, for transmitting module 301 after emitting ultrasonic signal, the ultrasonic signal can pass through display screen, and contact
To corresponding barrier, which can be finger, printing paper fingerprint or the silica gel fingerprint etc. of user, ultrasonic wave letter
Number it will form corresponding reflection signal after barrier reflection.
Then, receiving module 302 receives the reflection signal of reflection, and the reflection signal is converted to corresponding telecommunications
Number, electronic equipment can get the fingerprint image of user's finger according to the electric signal, which is three-dimensional fingerprint
Image.
It should be noted that the three-dimensional fingerprint image got is 3-D image, and pass through the optics hand such as camera
The accessed two-dimentional fingerprint image of section shooting is different.The three-dimensional fingerprint image not only includes fingerprint image, further includes referring to
The concave-convex degree of every bit in print image.Wherein, the concave-convex degree is it can be appreciated that every bit phase in the fingerprint pattern
For the relative altitude or relative distance of same reference planes.
First determining module 303, for determining the corresponding acoustic resistance characteristic information of barrier according to the reflection signal.
Wherein, although what electronic equipment got is three-dimensional fingerprint image, if illegal user is using imitating user
When the silica gel fingerprint of finger is verified, identical three-dimensional fingerprint image can be also got accordingly, and then crack electronic equipment
Fingerprint authentication, cause strong influence to the information security of user.Therefore, the embodiment of the present application is in addition to three-dimensional fingerprint image
It is verified, can also further be verified according to the corresponding acoustic resistance characteristic information of barrier.
Correspondingly, if the material of barrier is different, if finger skin is different from the material of silica gel, then for ultrasonic wave
Reflectivity be certainly it is different, so the barrier of different materials have different acoustic resistance characteristic informations.Even phase
Same skin histology, since two different person-to-person constitutions are different, reflectivity of the ultrasonic wave in the skin of different people
Fine distinction is had, so the finger of different people has different acoustic resistance characteristic informations, the first determining module 303 can root
The distinctive acoustic resistance characteristic information of barrier is determined according to the reflection signal.
In some embodiments, first determining module 303, specifically for the signal strength according to the reflection signal
Value determines corresponding reflectivity；The acoustic impedance information of barrier is determined based on the reflectivity；According to the reflection signal
Receiving time determine corresponding delayed data；The acoustic impedance information and delayed data are determined as corresponding acoustic resistance feature
Information.
In some embodiments, first determining module 303 is specifically also used to strong according to the signal of the reflection signal
Angle value determines corresponding reflectivity；The acoustic impedance information of barrier is determined based on the reflectivity；Obtain ultrasonic signal
Sending time when transmission；Obtain receiving time when reflection signal receives；According to the receiving time and the sending time
The corresponding time difference is calculated, and the time difference is determined as delayed data；The acoustic impedance information and delayed data is true
It is set to corresponding acoustic resistance characteristic information.
Second determining module 304, for determining corresponding fingerprint recognition result according to the acoustic resistance characteristic information.
Wherein, since the material of different barriers is different, so corresponding acoustic resistance characteristic information is certainly different, therefore,
Second determining module 304 can be according to acoustic resistance characteristic information default acoustic resistance characteristic information whether corresponding with user preset finger
Match to determine corresponding fingerprint recognition as a result, when acoustic resistance characteristic information default acoustic resistance characteristic information corresponding with user preset finger
When matching, illustrate that current barrier is user preset finger, fingerprint recognition passes through.When acoustic resistance characteristic information and user preset finger
When default acoustic resistance characteristic information mismatches accordingly, illustrating current barrier not is user preset finger, even if the barrier phase
The three-dimensional fingerprint image answered is matched with the three-dimensional fingerprint image of user preset, is also determined as that fingerprint recognition fails.
In some embodiments, second determining module 304, specifically for when detecting the acoustic impedance information and pre-
If the similarity of acoustic impedance information is greater than the first preset threshold, the difference for detecting the delayed data and default delayed data is
It is no less than the second preset threshold；When detecting the difference of the delayed data and default delayed data less than the second preset threshold
When, determine fingerprint recognition success；When the similarity for detecting the acoustic impedance information and default acoustic impedance information is not more than first
Preset threshold or when detecting the difference of the delayed data and default delayed data not less than the second preset threshold, determination refers to
Line recognition failures.
In some embodiments, as shown in figure 8, the ultrasonic fingerprint identification device 300 can also include: logging modle
305, setup module 306, acquisition module 307 and judgment module 308.
Logging modle 305 records the finger of the target user when for passing through in the fingerprint authentication for detecting target user
The corresponding target acoustic impedance information of line and target delayed data.
Setup module 306, for presetting acoustic impedance information accordingly according to the setting of the target acoustic impedance information of record, according to
Delayed data is preset in the target delayed data setting of record accordingly
Module 307 is obtained, for according to the reflection signal acquisition three-dimensional fingerprint image.
Whether judgment module 308, the similarity for judging the three-dimensional fingerprint image and default three-dimensional fingerprint image are big
In third predetermined threshold value, threshold is preset when the similarity for judging the three-dimensional fingerprint image and default three-dimensional fingerprint image is greater than third
When value, the first determining module 303 is executed.
From the foregoing, it will be observed that ultrasonic fingerprint identification device 300 provided by the embodiments of the present application, comprising: transmitting module 301 is connecing
When receiving fingerprint recognition instruction, is instructed according to fingerprint recognition and send ultrasonic signal；Receiving module 302 receives ultrasonic wave through obstacle
The reflection signal that object is formed after stopping；First determining module 303 determines the corresponding acoustic resistance feature of barrier according to reflection signal
Information；Second determining module 304 determines corresponding fingerprint recognition result according to acoustic resistance characteristic information.It, can be according to human body with this
The distinctive acoustic resistance characteristic information of finger identifies fingerprint, avoid attacking as illegal fingerprint and caused by fingerprint recognition it is wrong
Accidentally, it is greatly improved the accuracy of fingerprint recognition.
The embodiment of the present application also provides a kind of electronic equipment.The electronic equipment can be smart phone, tablet computer, trip
Play equipment, AR (Augmented Reality, augmented reality) equipment, automobile, data storage device, audio playing apparatus, video
Playing device, laptop, Desktop computing device, wearable device such as electronic watch, electronic glasses, electronic helmet, electricity
The equipment such as sub- bangle, electronics necklace, electronic clothes.
With reference to Fig. 9, Fig. 9 is second of structural schematic diagram of electronic equipment provided by the embodiments of the present application.
Wherein, electronic equipment 400 includes processor 401 and memory 402.Wherein, 402 electricity of processor 401 and memory
Property connection.
Processor 401 is the control centre of electronic equipment 400, utilizes various interfaces and the entire electronic equipment of connection
Various pieces, by running or calling the computer program being stored in memory 402, and calling to be stored in memory 402
Interior data execute the various functions and processing data of electronic equipment, to carry out integral monitoring to electronic equipment.
In the present embodiment, the processor 401 in electronic equipment 400 is according to following step, by one or more
The corresponding instruction of process of computer program be loaded into memory 402, and be stored in memory by processor 401 to run
Computer program in 402, thereby executing following steps:
When receiving fingerprint recognition instruction, is instructed according to the fingerprint recognition and send ultrasonic signal；
Receive the reflection signal that the ultrasonic wave is formed after barrier obstruction；
The corresponding acoustic resistance characteristic information of barrier is determined according to the reflection signal；
Corresponding fingerprint recognition result is determined according to the acoustic resistance characteristic information.
In some embodiments, when determining the corresponding acoustic resistance characteristic information of barrier according to the reflection signal, processing
Device 401 executes following steps:
Corresponding reflectivity is determined according to the signal strength indication of the reflection signal；
The acoustic impedance information of barrier is determined based on the reflectivity；
Corresponding delayed data is determined according to the receiving time of the reflection signal；
The acoustic impedance information and delayed data are determined as corresponding acoustic resistance characteristic information.
In some embodiments, when determining corresponding delayed data according to the receiving time of the reflection signal, processing
Device 401 executes following steps:
Obtain sending time when ultrasonic signal is sent；
Obtain receiving time when reflection signal receives；
The corresponding time difference is calculated with the sending time according to the receiving time, and the time difference is determined as
Delayed data.
In some embodiments, when determining corresponding fingerprint recognition result according to the acoustic resistance characteristic information, processor 401
Execute following steps:
When the similarity for detecting the acoustic impedance information and default acoustic impedance information is greater than the first preset threshold, detection
Whether the difference of the delayed data and default delayed data is less than the second preset threshold；
When detecting the difference of the delayed data and default delayed data less than the second preset threshold, determine that fingerprint is known
Cheng Gong not；
When detecting the similarity of the acoustic impedance information and default acoustic impedance information no more than the first preset threshold or work as
When detecting that the difference of the delayed data and default delayed data is not less than the second preset threshold, determine that fingerprint recognition fails.
In some embodiments, it is instructed before sending ultrasonic signal according to the fingerprint recognition, processor 401 also executes
Following steps:
When the fingerprint authentication for detecting target user passes through, the corresponding target acoustic resistance of fingerprint of the target user is recorded
Anti- information and target delayed data；
Acoustic impedance information is preset accordingly according to the setting of the target acoustic impedance information of record, is delayed and is believed according to the target of record
Delayed data is preset in breath setting accordingly.
In some embodiments, before determining the corresponding acoustic resistance characteristic information of barrier according to the reflection signal, place
Reason device 401 also executes following steps:
According to the reflection signal acquisition three-dimensional fingerprint image；
Judge whether the three-dimensional fingerprint image and the similarity of default three-dimensional fingerprint image are greater than third predetermined threshold value；
When the similarity for judging the three-dimensional fingerprint image and default three-dimensional fingerprint image is greater than third predetermined threshold value,
Execute the step of corresponding acoustic resistance characteristic information of barrier is determined according to the reflection signal.
Memory 402 can be used for storing computer program and data.Include in the computer program that memory 402 stores
The instruction that can be executed in the processor.Computer program can form various functional modules.Processor 401 is stored in by calling
The computer program of memory 402, thereby executing various function application and data processing.
It in some embodiments, is the third structure of electronic equipment provided by the embodiments of the present application with reference to Figure 10, Figure 10
Schematic diagram.
Wherein, electronic equipment 400 further include: display screen 403, display panel control circuit 404, sensor 405 and power supply
406.Wherein, processor 401 is electrical with display screen 403, display panel control circuit 404, sensor 405 and power supply 406 respectively
Connection.
Display screen 403 can be used for showing information input by user or be supplied to user information and electronic equipment it is each
Kind graphical user interface, these graphical user interface can be made of image, text, icon, video and any combination thereof.
Display panel control circuit 404 and display screen 403 are electrically connected, and show information for controlling display screen 403.
Sensor 405 is for acquiring external environmental information.Wherein, sensor 405 may include ultrasonic sensor, environment
One of sensors such as luminance sensor, acceleration transducer, gyroscope are a variety of.
All parts of the power supply 406 for electron equipment 400 are powered.In some embodiments, power supply 406 can pass through
Power-supply management system and processor 401 are logically contiguous, to realize management charging, electric discharge, Yi Jigong by power-supply management system
The functions such as consumption management.
Although being not shown in Figure 10, electronic equipment 400 can also be including radio-frequency module, camera, bluetooth module etc., herein
It repeats no more.
From the foregoing, it will be observed that the embodiment of the present application provides a kind of electronic equipment, the electronic equipment executes following steps: connecing
When receiving fingerprint recognition instruction, is instructed according to fingerprint recognition and send ultrasonic signal；Receive ultrasonic wave shape after barrier obstruction
At reflection signal；The corresponding acoustic resistance characteristic information of barrier is determined according to reflection signal；It is determined according to acoustic resistance characteristic information
Corresponding fingerprint recognition result.In ultrasonic fingerprint recognition methods, with this, it can be believed according to the distinctive acoustic resistance feature of human finger
Breath fingerprint is identified, avoid as illegal fingerprint attack and caused by fingerprint recognition mistake, be greatly improved fingerprint knowledge
Other accuracy.
The embodiment of the present application also provides a kind of storage medium, computer program is stored in the storage medium, when described
When computer program is run on computers, the computer executes ultrasonic fingerprint identification side described in any of the above-described embodiment
Method.
It should be noted that those of ordinary skill in the art will appreciate that whole in the various methods of above-described embodiment or
Part steps are relevant hardware can be instructed to complete by computer program, and the computer program can store in meter
In calculation machine readable storage medium storing program for executing, the storage medium be can include but is not limited to: read-only memory (ROM, Read Only
Memory), random access memory (RAM, Random Access Memory), disk or CD etc..
Above to ultrasonic fingerprint recognition methods, device, storage medium and electronic equipment provided by the embodiment of the present application
It is described in detail.Specific examples are used herein to illustrate the principle and implementation manner of the present application, the above reality
The explanation for applying example is merely used to help understand the present processes and its core concept；Meanwhile for those skilled in the art,
According to the thought of the application, there will be changes in the specific implementation manner and application range, in conclusion in this specification
Hold the limitation that should not be construed as to the application.
Claims (10)
1. a kind of ultrasonic fingerprint recognition methods characterized by comprising
When receiving fingerprint recognition instruction, is instructed according to the fingerprint recognition and send ultrasonic signal；
Receive the reflection signal that the ultrasonic wave is formed after barrier obstruction；
The corresponding acoustic resistance characteristic information of barrier is determined according to the reflection signal；
Corresponding fingerprint recognition result is determined according to the acoustic resistance characteristic information.
2. ultrasonic fingerprint recognition methods according to claim 1, which is characterized in that described true according to the reflection signal
The step of making barrier corresponding acoustic resistance characteristic information, comprising:
Corresponding reflectivity is determined according to the signal strength indication of the reflection signal；
The acoustic impedance information of barrier is determined based on the reflectivity；
Corresponding delayed data is determined according to the receiving time of the reflection signal；
The acoustic impedance information and delayed data are determined as corresponding acoustic resistance characteristic information.
3. ultrasonic fingerprint recognition methods according to claim 2, which is characterized in that described according to the reflection signal
Receiving time determines the step of corresponding delayed data, comprising:
Obtain sending time when ultrasonic signal is sent；
Obtain receiving time when reflection signal receives；
The corresponding time difference is calculated with the sending time according to the receiving time, and the time difference is determined as being delayed
Information.
4. ultrasonic fingerprint recognition methods according to any one of claims 2 to 3, which is characterized in that described according to
Acoustic resistance characteristic information determines the step of corresponding fingerprint recognition result, comprising:
When the similarity for detecting the acoustic impedance information and default acoustic impedance information is greater than the first preset threshold, described in detection
Whether the difference of delayed data and the second preset threshold is less than the second preset threshold；
When detecting the difference of the delayed data and default delayed data less than the second preset threshold, determine fingerprint recognition at
Function；
When the similarity for detecting the acoustic impedance information and default acoustic impedance information is not more than the first preset threshold or when detection
When the difference of the delayed data and default delayed data is not less than the second preset threshold out, determine that fingerprint recognition fails.
5. ultrasonic fingerprint recognition methods according to any one of claims 2 to 3, which is characterized in that described according to
Before the step of fingerprint recognition instruction sends ultrasonic signal, further includes:
When the fingerprint authentication for detecting target user passes through, the corresponding target acoustic impedance letter of fingerprint of the target user is recorded
Breath and target delayed data；
Acoustic impedance information is preset accordingly according to the setting of the target acoustic impedance information of record, is set according to the target delayed data of record
Set default delayed data accordingly.
6. ultrasonic fingerprint recognition methods according to any one of claims 1 to 3, which is characterized in that described according to
Before the step of reflection signal determines barrier corresponding acoustic resistance characteristic information, further includes:
According to the reflection signal acquisition three-dimensional fingerprint image；
Judge whether the three-dimensional fingerprint image and the similarity of default three-dimensional fingerprint image are greater than third predetermined threshold value；
When the similarity for judging the three-dimensional fingerprint image and default three-dimensional fingerprint image is greater than third predetermined threshold value, execute
The step of determining barrier corresponding acoustic resistance characteristic information according to the reflection signal.
7. a kind of ultrasonic fingerprint identification device characterized by comprising
Transmitting module, for being instructed according to the fingerprint recognition and sending ultrasonic signal when receiving fingerprint recognition instruction；
Receiving module, the reflection signal formed after barrier obstruction for receiving the ultrasonic wave；
First determining module, for determining the corresponding acoustic resistance characteristic information of barrier according to the reflection signal；
Second determining module, for determining corresponding fingerprint recognition result according to the acoustic resistance characteristic information.
8. ultrasonic fingerprint identification device according to claim 7, which is characterized in that first determining module, specifically
For:
Corresponding reflectivity is determined according to the signal strength indication of the reflection signal；
The acoustic impedance information of barrier is determined based on the reflectivity；
Corresponding delayed data is determined according to the receiving time of the reflection signal；
The acoustic impedance information and delayed data are determined as corresponding acoustic resistance characteristic information.
9. a kind of storage medium, which is characterized in that computer program is stored in the storage medium, when the computer program
When running on computers, so that the computer perform claim requires 1 to 6 described in any item ultrasonic fingerprint identification sides
Method.
10. a kind of electronic equipment, which is characterized in that the electronic equipment includes processor and memory, is deposited in the memory
Computer program is contained, the processor is used for right of execution by calling the computer program stored in the memory
Benefit requires 1 to 6 described in any item ultrasonic fingerprint recognition methods.
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