CN109919075A - A kind of fingerprint measurement, fingerprint identification method and system, medium - Google Patents
A kind of fingerprint measurement, fingerprint identification method and system, medium Download PDFInfo
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Abstract
This application discloses a kind of fingerprint measurement, fingerprint identification method and systems, medium.The fingerprint measurement includes: that light generates unit, spectrophotometric unit, reflector element, measuring unit and photo sensing unit, and the light generates unit the first optical signal of generation and is incident to the spectrophotometric unit in parallel；First optical signal is divided into mutually perpendicular second optical signal and third optical signal by the spectrophotometric unit, second optical signal is incident on the measuring unit, the third optical signal is incident on the reflector element, it receives the measuring unit and scatters resulting 4th optical signal, receive reflected 5th optical signal of the reflector element, it is incident on the photo sensing unit, the photo sensing unit carries out photoelectric conversion generation fingerprint and measures and export.Scheme provided in this embodiment reduces the requirement to fingerprint recognition finger surface, improves fingerprint recognition success rate.
Description
Technical field
The present invention relates to fingerprint identification technology, espespecially a kind of fingerprint measurement, fingerprint identification method and system, medium.
Background technique
Fingerprint identification technology is that price is most cheap, one of the biological identification technology being most widely used, in recent years fingerprint
Identification technology development is swift and violent and remains powerful development trend, is currently widely used for enterprise's attendance recorder, intelligent residential district, fingerprint
In many fields such as lock, fingerprint IC (Integrated Circuit, integrated circuit) card, judicial and finance.Future is with fingerprint
The increasingly mature and cost of identification technology gradually decreases, and application of the fingerprint identification technology in the fields such as military and civilian also can
It is more and more extensive, therefore there is critically important realistic meaning and market value for the research of fingerprint identification technology.
Mainly there are optical finger print identification, capacitive fingerprint identification and ultrasonic fingerprint identification for fingerprint recognition currently on the market
Three kinds, wherein optical fingerprint identification technology occurs earliest, by technology maturation and it is at low cost the advantages that have become answer at present
With most commonly used fingerprint identification technology.Traditional optical finger print recognition methods is the total reflection principle based on light, when light passes through
Cross after glass is irradiated to the fingerprint valley position for being pressed in glass surface, the light can the interface of air and glass occur total reflection from
And it is reflected in CCD (Charge-Coupled Device, charge-coupled device) detector and forms clearly fingerprint image
Picture.And those are radiated at the light for being pressed in the fingerprint ridge position of glass surface by glass, because being unsatisfactory for total reflection condition thus
Will not be totally reflected, therefore these light can not just form clearly fingerprint image on ccd detector, but by glass with
The contact interface of Fingers wrinkle ridge absorbs or diffusing reflection is to other places.
But there is intrinsic in the precision of fingerprint recognition for the above-mentioned this optical finger print recognition methods based on total reflection
Defect, the decortication of such as fingerprint, fingerprint is too shallow and fingerprint is too dry in the case where be easy to appear wrong identification the problem of.
Summary of the invention
A present invention at least embodiment provides a kind of fingerprint measurement, fingerprint identification method and system, medium, reduces
Fingerprint wrong identification.
In order to reach the object of the invention, a present invention at least embodiment provides a kind of fingerprint measurement, comprising: light produces
Raw unit, spectrophotometric unit, reflector element, measuring unit and photo sensing unit, the measuring unit include one for user's touch
Measuring surface, the reflector element include a reflecting surface, in which:
The light generates unit and is used for, and generates the first optical signal and is incident to the spectrophotometric unit in parallel；
The spectrophotometric unit is used for, and first optical signal is divided into mutually perpendicular second optical signal and third light is believed
Number, the second optical signal is incident on to the measuring surface of the measuring unit, the third optical signal is incident on the reflector element,
Wherein, second optical signal is perpendicular to the measuring surface, the third optical signal perpendicular to the reflector element reflecting surface,
And receive the measuring unit and resulting 4th optical signal is scattered to second optical signal, it is single to receive the reflection
Member carries out the third optical signal to reflect resulting 5th optical signal, and the 4th optical signal and the 5th optical signal are incident on
The photo sensing unit；
The measuring unit is used for, and is received the second optical signal from the spectrophotometric unit, is occurred in the measuring surface
Scattering returns to the 4th optical signal to the spectrophotometric unit；
The reflector element is used for, and is received the third optical signal from the spectrophotometric unit, is reflected, and the 5th light is returned
Signal is to the spectrophotometric unit；
The photo sensing unit is used for, and receives the 4th optical signal and the 5th optical signal of the spectrophotometric unit incidence, into
Row photoelectric conversion generates fingerprint metrical information and exports.
In one embodiment, it includes laser, filter and the first lens that the light, which generates unit, in which:
The laser is used for, and generates optical signal, the optical signal is incident on the filter；
The filter is used for, and is filtered to the optical signal of laser input, is exported filtered optical signal extremely
First lens；
First lens are used for, and are that parallel optical signal obtains the first light letter by the converting optical signals that the filter inputs
Number, first optical signal is incident on the spectrophotometric unit.
In one embodiment, the spectrophotometric unit includes Amici prism.
In one embodiment, the photo sensing unit includes the second lens and photodetector, in which:
Second lens are used for, and the 4th optical signal and the 5th optical signal of the spectrophotometric unit incidence are received, after convergence
It is incident on the photodetector；
The photodetector is used for, and receives the optical signal from second lens entrance, is carried out photoelectric conversion and is generated institute
It states fingerprint metrical information and exports.
One embodiment of the invention provides a kind of fingerprint identification method, measures and fills applied to fingerprint described in any embodiment
It sets, comprising:
Obtain fingerprint metrical information；
Processing is carried out to the fingerprint metrical information and obtains phase information；
Fingerprint depth information is determined according to the phase information；
Finger print information is determined according to the fingerprint depth information.
In one embodiment, it is described to the fingerprint metrical information carry out processing obtain phase information include:
Wavelet transformation is carried out to the fingerprint metrical information, obtains truncation phase information；According to the truncation phase information
Obtain continuous phase information；
It is described to determine that fingerprint depth information includes: according to the phase information
According to the continuous phase information recovery fingerprint.
In one embodiment, described to carry out wavelet transformation to the fingerprint metrical information, obtaining truncation phase information includes:
Continuous wavelet transform is carried out to the fingerprint metrical information f (t):
From the coefficient W of continuous wavelet transformfWavelet Ridge is extracted in the maximum value of (m, n), truncation phase is determined according to its amplitude
Position information, wherein ΨM, n(t) for wavelet basis functionTranslate the collection for the wavelet basis function that flexible processing obtains
It closes, m is contraction-expansion factor, and n is shift factor.
In one embodiment, described to determine that fingerprint depth information includes: according to the continuous phase information
Wherein, λ is the wavelength information of the first optical signal, and Φ (t) is the continuous phase information.
One embodiment of the invention provides a kind of medium, is stored thereon with the computer program that can be run on a processor, institute
State the step of fingerprint identification method described in any embodiment is realized when computer program is executed by the processor.
One embodiment of the invention provides a kind of fingerprint recognition system, including fingerprint measurement described in any embodiment,
Further include: processor and memory, the memory are stored with program, described program read by the processor execute when,
Realize fingerprint identification method described in any embodiment.
In above-described embodiment provided by the invention, due to obtaining finger print information by scattering light, relative in the related technology
By total reflection mode acquisition finger print information, the requirement under scattering method to finger surface is lower than under total reflection mode to finger watch
Therefore the requirement in face remains to accurately identify fingerprint, overcomes tradition in the case where fingerprint decortication, fingerprint are too shallow and fingerprint is too dry
Mistake is easy to appear in the case where fingerprint decortication, fingerprint are too shallow and fingerprint is too dry in fingerprint recognition based on total reflection measuring principle
The problem of misrecognition.In addition, accuracy of identification reaches Nano grade, there is very high-precision.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by specification, right
Specifically noted structure is achieved and obtained in claim and attached drawing.
Detailed description of the invention
Attached drawing is used to provide to further understand technical solution of the present invention, and constitutes part of specification, with this
The embodiment of application technical solution for explaining the present invention together, does not constitute the limitation to technical solution of the present invention.
Fig. 1 is the fingerprint identification device schematic diagram that one embodiment of the invention provides；
Fig. 2 be another embodiment of the present invention provides fingerprint identification device schematic diagram；
Fig. 3 be another embodiment of the present invention provides fingerprint identification device schematic diagram；
Fig. 4 be another embodiment of the present invention provides fingerprint identification device schematic diagram；
Fig. 5 be another embodiment of the present invention provides fingerprint identification device schematic diagram；
Fig. 6 be another embodiment of the present invention provides fingerprint identification method flow chart；
Fig. 7 is the fingerprint identification method flow chart that a specific example of the invention provides；
Fig. 8 is the fingerprint recognition system schematic diagram that one embodiment of the invention provides；
Fig. 9 is the medium schematic diagram that one embodiment of the invention provides.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention
Embodiment be described in detail.It should be noted that in the absence of conflict, in the embodiment and embodiment in the application
Feature can mutual any combination.
Step shown in the flowchart of the accompanying drawings can be in a computer system such as a set of computer executable instructions
It executes.Also, although logical order is shown in flow charts, and it in some cases, can be to be different from herein suitable
Sequence executes shown or described step.
Unless otherwise defined, the technical term or scientific term that the disclosure uses should be tool in fields of the present invention
The ordinary meaning for thering is the personage of general technical ability to be understood." first ", " second " used in the disclosure and similar word are simultaneously
Any sequence, quantity or importance are not indicated, and are used only to distinguish different component parts." comprising " or "comprising" etc.
Similar word means that the element or object before the word occur covers the element or object for appearing in the word presented hereinafter
And its it is equivalent, and it is not excluded for other elements or object.The similar word such as " connection " or " connected " is not limited to physics
Or mechanical connection, but may include electrical connection, it is either direct or indirectly."upper", "lower",
"left", "right" etc. is only used for indicating relative positional relationship, and after the absolute position for being described object changes, then the relative position is closed
System may also correspondingly change.
In the related technology, optical finger print recognition methods is mainly based upon total reflection measuring principle, according to fingerprint on finger
Valley and a ridge realizes the identification to fingerprint to the reflex of light.But this optical finger print recognition methods based on total emission
Have the defects that in the precision of fingerprint recognition it is intrinsic, in the decortication of such as fingerprint, in the case that fingerprint is too shallow and fingerprint is too dry
The problem of being easy to appear wrong identification.
A kind of fingerprint measurement and method based on fingerprint depth measurement is disclosed in the embodiment of the present invention comprising one
Set is able to achieve the measuring system and a set of calculation method for being able to achieve finger print information identification of fingerprint depth measurement.The embodiment of the present invention
In, the fingerprint depth between going measurement finger print valley and a ridge with a set of optical measuring system is restored in conjunction with corresponding calculation method
Fingerprint, to provide a kind of novel optical fingerprint measurement and method with higher precision.
As shown in Figure 1, one embodiment of the invention provides a kind of fingerprint measurement, it is able to achieve fingerprint depth measurement, is wrapped
Including light generation unit 1, spectrophotometric unit 2, reflector element 3, measuring unit 4 and photo sensing unit 5, the reflector element 3 includes
One reflecting surface 31, the measuring unit 4 include a measuring surface 41 touched for user, in which:
The light generates unit 1 and is used for, and generates the first optical signal A1 and is incident to the spectrophotometric unit 2；
The spectrophotometric unit 2 is used for, and the first optical signal A1 is divided for mutually perpendicular second optical signal and third light
Second optical signal, is incident on the measuring surface of the measuring unit 4 by signal, and the third optical signal is incident on the reflector element
3, wherein for second optical signal perpendicular to the measuring surface 41, the third optical signal is anti-perpendicular to the reflector element 3
Face 31 is penetrated, and, it receives the measuring unit 4 and resulting 4th optical signal is scattered to second optical signal, receive institute
It states reflector element 3 the third optical signal is carried out to reflect resulting 5th optical signal, by the 4th optical signal and the 5th light
Signal is incident on the photo sensing unit 5 in parallel；
The measuring unit 4 is used for, and is received the second optical signal from the spectrophotometric unit 2, is sent out in the measuring surface
Raw scattering returns to the 4th optical signal to the spectrophotometric unit 2；Wherein, when having the touch of finger 6 in measuring surface 41, the 4th optical signal
Middle carrying finger print information；Measuring unit 4 is such as to be realized using glass etc..
The reflector element 3 is used for, and is received the third optical signal from the spectrophotometric unit 2, is reflected, and returns to the 5th
Optical signal is to the spectrophotometric unit 2；Reflector element 3 is such as a reflecting mirror.
The photo sensing unit 5 is used for, and receives the spectrophotometric unit 2 incident the 4th optical signal and the 5th optical signal,
Photoelectric conversion is carried out to generate fingerprint metrical information and export.
In above-described embodiment provided by the invention, due to obtaining finger print information by scattering light, relative in the related technology
By total reflection mode acquisition finger print information, the requirement under scattering method to finger surface is lower than under total reflection mode to finger watch
Therefore the requirement in face remains to accurately identify fingerprint, overcomes tradition in the case where fingerprint decortication, fingerprint are too shallow and fingerprint is too dry
Mistake is easy to appear in the case where fingerprint decortication, fingerprint are too shallow and fingerprint is too dry in fingerprint recognition based on total reflection measuring principle
The problem of misrecognition, reduces the requirement to fingerprint recognition finger surface, improves fingerprint recognition success rate.In addition, this implementation
The scheme that example provides, accuracy of identification reach Nano grade, have very high-precision.
In one embodiment, as shown in Fig. 2, it includes laser 11, filter 12 and the first lens that the light, which generates unit 1,
13, in which:
The laser 11 is used for, and generates optical signal, the optical signal is incident on the filter 12；
The filter 12 is used for, and is filtered to the optical signal of the laser 11 input, and filtered light letter is exported
Number to first lens 13；The optical signal that laser 11 generates contains part veiling glare, is filtered out, in addition, can also be expanded
Beam.I.e. filter 12 can be to expand filter.
First lens 13 are used for, and are that parallel optical signal obtains first by the converting optical signals that the filter 12 inputs
First optical signal is incident on the spectrophotometric unit 2 by optical signal.
It should be noted that in another embodiment, the light, which generates unit 1, can only include laser 11.
In one embodiment, the spectrophotometric unit 2 includes Amici prism.The first incident signal is divided into two by Amici prism
Part, the transmitted light beam for reflecting upward deflecting light beams and directly transmiting, one of them is incident on reflector element, another to be incident on
Measuring unit, and, the reflected reference optical signal of reflector element 3 (the 5th optical signal) is received, measuring unit 4 is received and dissipates
It is emitted back towards the measurement optical signal (the 4th optical signal) come, by one of the 4th optical signal, the 5th optical signal by transmission mode, separately
One is incident on photo sensing unit 5 by refractive Iy.When on measuring surface surface or top without finger, the 4th optical signal,
Five optical signals are incident on photo sensing unit 5 in parallel.
In another embodiment, as shown in figure 3, the photo sensing unit 5 includes the second lens 51 and photodetector
52, in which:
Second lens 51 are used for, and receive the spectrophotometric unit 4 incident the 4th optical signal and the 5th optical signal, convergence
After be incident on the photo switches, photo sensors 52；
The photodetector 52 is used for, and is received from the incident optical signal of second lens 51, is carried out photoelectric conversion
It generates the fingerprint metrical information and exports.
Wherein, the photodetector 52 is the device for carrying out photoelectric conversion.In the present embodiment, by the strength information of speckle
Be converted to the output of fingerprint metrical information.Photodetector 52 can be CCD, be also possible to other electrooptical devices, such as
CMOS (Complementary Metal Oxide Semiconductor), point detector etc..
As shown in figure 4, the fingerprint measurement provided for one embodiment of the invention, comprising: laser 11,12 and of filter
First lens 13, spectrophotometric unit 2 (being Amici prism in the present embodiment), reflector element 3, measuring unit 4 and photo sensing unit
5, the second lens 51 and photodetector 52, the fingerprint measurement principle are as follows:
It is irradiated on the first lens 13 and by it after filter 12 is filtered by the light that light source (laser 11) is emitted
It expands, the illumination after expanding, which is mapped on Amici prism 2, is divided into two parts by it, wherein the prism 2 that is split reflects upward light quilt
Referred to as deflecting light beams, and the light for penetrating Amici prism 2 is referred to as transmitted light beam.Transmitted light beam can quilt after being incident on reflector element 3
It is reflected back in Amici prism 2 and forms reference light, deflecting light beams are incident in the measuring surface 41 that top has finger to press and occur to dissipate
It penetrates, the scattering light for carrying finger print information, which can be scattered back on Amici prism 2, forms measurement light.Reference beam is split prism 2
Downwards, measuring beam then penetrates downwards Amici prism 2 for refraction, this two-beam is incident on the second lens 51 via Amici prism 2,
Then it reaches on photodetector 52 and forms speckle, the strength information of the speckle is recorded and defeated by photodetector 52
Out.
It should be noted that the position of reflector element in Fig. 1~4, measuring unit can be interchanged.In another embodiment,
As shown in figure 5, the location swap of reflector element 3 and measuring unit 4 reflects light at this point, transmitted light beam is incident on measuring unit 4
Beam is incident on reflector element 3, and deflecting light beams, which are incident on after reflector element 3 to be reflected back toward in spectrophotometric unit 2, forms reference beam,
Transmitted light beam is incident in the measuring surface 41 of finger pressing and scatters, and the scattering light for carrying finger print information can be scattered
It returns on spectrophotometric unit 2 and forms measuring beam.The measuring beam unit 2 that is split reflects downwards, and reference beam is then downwards through light splitting
Unit 2.
Fingerprint measurement based on the embodiment of the present invention, one embodiment of the invention also provide a kind of fingerprint recognition side
Method, applied to fingerprint measurement described in any embodiment, as shown in Figure 6, comprising:
Step 601, fingerprint metrical information is obtained；
That is, obtaining the fingerprint metrical information of photo sensing unit output.
Step 602, processing is carried out to the fingerprint metrical information and obtains phase information；
Step 603, fingerprint depth information is determined according to the phase information；
Step 604, fingerprint is restored according to the fingerprint depth information.
Scheme provided in this embodiment carries out fingerprint recognition by receiving the finger print information that scattering light carries, relative to phase
Finger print information is obtained by total reflection mode in the technology of pass, the requirement under scattering method to finger surface is lower than under total reflection mode
Therefore requirement to finger surface remains to accurately identify fingerprint in the case where fingerprint decortication, fingerprint are too shallow and fingerprint is too dry,
Overcome in fingerprint recognition of the tradition based on total reflection measuring principle and holds in the case where fingerprint decortication, fingerprint are too shallow and fingerprint is too dry
Easily there is the problem of wrong identification, reduce the requirement to fingerprint recognition finger surface, improves fingerprint recognition success rate.Separately
Outside, scheme provided in this embodiment, accuracy of identification reach Nano grade, have very high-precision.
In one embodiment, in the step 602, processing is carried out to the fingerprint metrical information and obtains phase information packet
It includes:
Wavelet transformation is carried out to the fingerprint metrical information, obtains truncation phase information；According to the truncation phase information
Obtain continuous phase information；
It is described to determine that fingerprint depth information includes: according to the phase information
Fingerprint depth information is determined according to the continuous phase information.
It should be noted that there are many ways to obtaining truncation phase information, such as Fourier transformation method, phase shift algorithm
Deng.
Wherein, it is obtained there are many continuous phase information approaches according to the truncation phase information, such as track path phase
Unwrapping algorithm, unrelated phase unwrapping algorithm in path etc..
In one embodiment, described to carry out wavelet transformation to the fingerprint metrical information, obtaining truncation phase information includes:
Continuous wavelet transform is carried out to the fingerprint metrical information f (t):
From the coefficient W of continuous wavelet transformfWavelet Ridge is extracted in the maximum value of (m, n), truncation phase is determined according to its amplitude
Position information, wherein ΨM, n(t) for wavelet basis functionTranslate the collection for the wavelet basis function that flexible processing obtains
It closes, m is contraction-expansion factor, and n is shift factor.
In one embodiment, described to determine that fingerprint depth information includes: according to the continuous phase information
Wherein, λ is the wavelength information of the first optical signal；Φ (t) is the continuous phase information based on time change.
Fingerprint identification method is illustrated below by a specific embodiment.As shown in fig. 7, comprises:
Step 701, detecting measuring surface, there are fingers to press (light intensity changes at this time), triggers photodetector；
Step 702, photodetector acquisition speckle information (i.e. fingerprint metrical information) be transmitted to including processor and
The processing system of memory；
Step 703, processor carries out wavelet transformation to the speckle information and obtains truncation phase information；
Step 704, processor obtains continuously truncation phase information progress Carrier-smoothed code (or phase unwrapping)
Phase information；
Step 705, processor calculates the depth of the fingerprint between finger print paddy ridge according to continuous phase information, according to finger
Line depth restores finger print information out.
Wherein, in step 703, processor carries out wavelet transformation to the speckle information and obtains the realization of truncation phase information
It is described as follows；
The collected speckle intensity function I (x, y, t) of photodetector 52 when no finger presses are as follows:
I (x, y, t)=I0(x, y) { 1+Vcos [Φ0(x, y)] } (1)
Wherein, I0(x, y) is interference field mean intensity, and V is modulation visibility, Φ0(x, y) is initial phase.
The collected speckle intensity function of photodetector 52 when having finger pressing are as follows:
I (x, y, t)=I0(x, y) { 1+Vcos [Φ0(x, y) ± 4 π Δ z (x, y, t)/λ] } (2)
Wherein, Δ z (x, y, t) is the warping function in measuring surface, ± for the mobile side in fingerprint relative measurement face on finger
To, take positive sign when the fingerprint on finger is close to measuring surface, otherwise take negative sign, λ be the wavelength for the optical signal that laser issues (i.e.
The wavelength of first optical signal).
Speckle intensity function I (x, y, t) is collected fingerprint metrical information, true according to I (x, y, t) in the application
Determine Δ z (x, y, t).Specifically, truncation phase information can be obtained by carrying out wavelet transformation to I (x, y, t), then phase will be truncated
Position information is converted to continuous phase information, determines Δ z (x, y, t) according to continuous phase information.
The available truncation phase information of wavelet transform process is carried out to the collected speckle information of institute.Wavelet transformation be
Wavelet basis function be displaced τ after with the signal f (t) to be analyzed under different scale a (in the present embodiment, f (t) is I (x, y, t))
Do inner product.If Ψ (x) ∈ M2(R) it is quadractically integrable function, can obtains meeting admissibility condition after carrying out it Fourier transformation
Wavelet basis functionAnd have:
Translate to wavelet basis function the set Ψ (m, n (t)) of the flexible available wavelet basis function of processing, it may be assumed that
Wherein, m is contraction-expansion factor, and n is shift factor.Then in the space M2 (R) arbitrary function f (t) continuous wavelet transform
To may be expressed as:
From the coefficient W of continuous wavelet transformfWavelet Ridge, amplitude A (m, n) are extracted in the maximum value of (m, n)) it can indicate
Are as follows:
Wherein, Im[Wf(m, n)] it is WfThe imaginary part of (m, n), Re[Wf(m, n)] it is WfThe real part of (m, n).According to amplitude A (m,
N) I) is determinedm[Wf(m, n)], Re[Wf(m, n)] after, truncation phase information is obtained by following formulaAre as follows:
Truncation phase information is obtained because of the characteristic of arctan function, to be limited in the area [- π, π] above by wavelet transformation
Interior discontinuous phase, therefore need to be spread out by phase unwrapping algorithm as continuous phase.Wherein, Carrier-smoothed code is calculated
There are many methods, is illustrated below with one of algorithm to Carrier-smoothed code.
Wherein, in step 704, processor carries out Carrier-smoothed code (or phase unwrapping) to the truncation phase information and obtains
Include: to continuous phase information
Step 801, it is first determined compensation phaseIt mends(x, y).
In φIt cutsThe discontinuous place (x, y) must have a Δ φ caused by the property of arctan functionIt cuts(xi, y)
The phase step of=2 π, it is therefore desirable to which a φ is added to truncation phase informationIt mendsThe phase compensation of (x, y)=± 2 π, thus will
Truncation phase information is launched into continuous phase information.
If by formula (7) phase information obtainedFor φIt cuts(x, y) obtains the truncation phase of adjacent two o'clock
Difference:
ΔφIt cuts(xi, y) and=φIt cuts(xi, y) and-φIt cuts(xi-1, y), i=1 ... N, N are total points (8)
Then it is faster than phase change in sample frequency, and when step does not occur for phase, truncation phase absolute value of the difference exists such as
Lower relationship:
|ΔφIt cuts(xi, y) |≤2 π (9)
Therefore, can pass through | Δ φIt cuts(xi, y) | to judge whether phase occurs step.
Preset threshold P, P outline is less than 2 π.
Default x0=0, and φIt mends(x0, y)=0, to any point i, i=1...N:
Work as satisfaction | Δ φIt cuts(xi, y) | > P, it is believed that step occurs for phase, otherwise it is assumed that step does not occur for phase.
If step does not occur for point i phase:
φIt mends(xi, y) and=φIt mends(x0, y) and=0 (10)
If step occurs for point i phase:
If Δ φIt cuts(xi, y) and > 0, then have:
φIt mends(xi, y) and=φIt mends(xi-1, y) and -2 π (11)
If Δ φIt cuts(xi, y) and < 0, then have:
φIt mends(xi, y) and=φIt mends(xi-1, y) and+2 π (12)
The compensation phase of each point is determined according to above-mentioned steps.
Step 802, the truncation phase of each point is added with compensation phase, just obtains continuous phase.
That is continuous phase φEven(x, y) are as follows:
φEven(x, y)=φIt cuts(x,y)+φIt mends(x,y) (13)
Wherein, in step 705, processor calculates the depth of the fingerprint between finger print paddy ridge according to continuous phase information
Include:
According to temporal speckle measuring principle, drop, that is, fingerprint depth delta z (t) between finger print valley and a ridge can be by even
Continuous phase information is acquired by following formula:
Wherein, λ is the wavelength (i.e. the wavelength of the first optical signal) for the optical signal that laser issues, and Φ (t) is continuous phase
Information.After calculating the drop i.e. depth of fingerprint between finger print valley and a ridge by formula (14), it is according to the depth of fingerprint
Resilient finger print information out, realizes the purpose to fingerprint recognition.
In one embodiment, maximum functional distance (i.e. maximum distance of the finger from measuring surface) can be set, when in most
In big operating distance (finger is less than or equal to maximum functional distance at a distance from measuring surface), fingerprint collecting is carried out, when in maximum
When outside operating distance, without fingerprint collecting.In advance acquisition maximum functional apart from when speckle light intensity values.According to speckle light intensity values
Determine whether to carry out fingerprint collecting.It is of course also possible to maximum functional distance is not set, the only progress when finger is pressed into measuring surface
Fingerprint collecting.
One embodiment of the invention provides a kind of fingerprint identification device, including processor and memory, the memory storage
There is program, described program realizes fingerprint identification method described in any embodiment when reading execution by the processor.
Inventive concept based on previous embodiment, one embodiment of the invention provide a kind of fingerprint recognition system, such as Fig. 8 institute
Show, including fingerprint measurement described in any of the above-described embodiment, further includes: processor 81 and memory 82, the memory
82 are stored with program, and described program realizes fingerprint recognition described in any embodiment when reading execution by the processor 81
Method.Fingerprint recognition system provided in this embodiment has the advantages that high-precision, high sensitivity, is able to achieve measurement of full field, not only
It can overcome in fingerprint recognition of the tradition based on total reflection measuring principle in the situation that fingerprint decortication, fingerprint are too shallow and too dry fingerprint
Under the problem of being easy to appear wrong identification, additionally it is possible to the precision for further increasing fingerprint recognition, can be widely used for enterprise's attendance recorder,
In many fields such as intelligent residential district, Fingerprint Lock, fingerprint IC card, the administration of justice and finance.
As shown in figure 9, one embodiment of the invention provides a kind of medium 90, it is stored thereon with the meter that can be run on a processor
Calculation machine program 91, the computer program 91 realize fingerprint recognition described in any of the above-described embodiment when being executed by the processor
The step of method.
There is the following to need to illustrate:
(1) attached drawing of the embodiment of the present invention is related only to the present embodiments relate to the structure arrived, and other structures can refer to
It is commonly designed.
(3) in the absence of conflict, the feature in the embodiment of the present invention and embodiment can be combined with each other to obtain
New embodiment.
Although disclosed herein embodiment it is as above, the content only for ease of understanding the present invention and use
Embodiment is not intended to limit the invention.Technical staff in any fields of the present invention is taken off not departing from the present invention
Under the premise of the spirit and scope of dew, any modification and variation, but the present invention can be carried out in the form and details of implementation
Scope of patent protection, still should be subject to the scope of the claims as defined in the appended claims.
Claims (10)
1. a kind of fingerprint measurement, comprising: it is single that light generates unit, spectrophotometric unit, reflector element, measuring unit and photoelectricity sensing
Member, the measuring unit include a measuring surface touched for user, and the reflector element includes a reflecting surface, in which:
The light generates unit and is used for, and generates the first optical signal and is incident to the spectrophotometric unit in parallel；
The spectrophotometric unit is used for, and first optical signal is divided into mutually perpendicular second optical signal and third optical signal, will
Second optical signal is incident on the measuring surface of the measuring unit, and the third optical signal is incident on the reflector element, wherein
Second optical signal perpendicular to the measuring surface, the third optical signal perpendicular to the reflector element reflecting surface, and,
It receives the measuring unit and resulting 4th optical signal is scattered to second optical signal, receive the reflector element to institute
It states third optical signal to carry out reflecting resulting 5th optical signal, the 4th optical signal and the 5th optical signal is incident on the light
Electrical sensing unit；
The measuring unit is used for, and is received the second optical signal from the spectrophotometric unit, is scattered in the measuring surface,
The 4th optical signal is returned to the spectrophotometric unit；
The reflector element is used for, and is received the third optical signal from the spectrophotometric unit, is reflected, and the 5th optical signal is returned
To the spectrophotometric unit；
The photo sensing unit is used for, and receives the 4th optical signal and the 5th optical signal of the spectrophotometric unit incidence, carries out light
Electricity conversion generates fingerprint metrical information and exports.
2. fingerprint measurement according to claim 1, which is characterized in that it includes laser, filter that the light, which generates unit,
Wave device and the first lens, in which:
The laser is used for, and generates optical signal, the optical signal is incident on the filter；
The filter is used for, and is filtered to the optical signal of laser input, is exported filtered optical signal to described
First lens；
First lens are used for, and are that parallel optical signal obtains the first optical signal by the converting optical signals that the filter inputs,
First optical signal is incident on the spectrophotometric unit.
3. fingerprint measurement according to claim 1, which is characterized in that the spectrophotometric unit includes Amici prism.
4. fingerprint measurement according to any one of claims 1 to 3, which is characterized in that the photo sensing unit includes
Second lens and photodetector, in which:
Second lens are used for, and receive the 4th optical signal and the 5th optical signal of the spectrophotometric unit incidence, incident after convergence
To the photodetector；
The photodetector is used for, and receives the optical signal from second lens entrance, is carried out photoelectric conversion and is generated the finger
Line metrical information simultaneously exports.
5. a kind of fingerprint identification method, applied to the fingerprint measurement as described in Claims 1-4 is any, comprising:
Obtain fingerprint metrical information；
Processing is carried out to the fingerprint metrical information and obtains phase information；
Fingerprint depth information is determined according to the phase information；
Finger print information is determined according to the fingerprint depth information.
6. fingerprint identification method according to claim 5, which is characterized in that
It is described to the fingerprint metrical information carry out processing obtain phase information include:
Wavelet transformation is carried out to the fingerprint metrical information, obtains truncation phase information；It is obtained according to the truncation phase information
Continuous phase information；
It is described to determine that fingerprint depth information includes: according to the phase information
According to the continuous phase information recovery fingerprint.
7. fingerprint identification method according to claim 6, which is characterized in that described small to fingerprint metrical information progress
Wave conversion, obtaining truncation phase information includes:
Continuous wavelet transform is carried out to the fingerprint metrical information f (t):
From the coefficient W of continuous wavelet transformfWavelet Ridge is extracted in the maximum value of (m, n), truncation phase letter is determined according to its amplitude
Breath, wherein ΨM, n(t) for wavelet basis functionTranslate the set for the wavelet basis function that flexible processing obtains, m is
Contraction-expansion factor, n are shift factor.
8. fingerprint identification method according to claim 6 or 7, which is characterized in that described according to the continuous phase information
Determine that fingerprint depth information includes:
Wherein, λ is the wavelength information of the first optical signal, and Φ (t) is the continuous phase information.
9. a kind of medium, which is characterized in that be stored thereon with the computer program that can be run on a processor, the computer journey
The step of fingerprint identification method as described in any one of claim 5 to 8 is realized when sequence is executed by the processor.
10. a kind of fingerprint recognition system, including the fingerprint measurement as described in Claims 1-4 is any, further includes: processing
Device and memory, the memory are stored with program, and described program realizes that such as right is wanted when reading execution by the processor
Seek 5 to 8 any fingerprint identification methods.
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