CN110020594A - Fingerprint image method for sensing - Google Patents
Fingerprint image method for sensing Download PDFInfo
- Publication number
- CN110020594A CN110020594A CN201910125666.2A CN201910125666A CN110020594A CN 110020594 A CN110020594 A CN 110020594A CN 201910125666 A CN201910125666 A CN 201910125666A CN 110020594 A CN110020594 A CN 110020594A
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- China
- Prior art keywords
- fingerprint
- guide plate
- light guide
- light
- sensing
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/145—Illumination specially adapted for pattern recognition, e.g. using gratings
-
- 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
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
Abstract
The present invention discloses a kind of fingerprint image method for sensing, the induction light of its at least one-dimensional collimation generated using collimated light source enters light guide plate, recycle the induction light level fingerprint of amplification, to generate the fingerprint signal of collimation, after light guide plate inside contracts small fingerprint signal, then will reduce and the fingerprint signal of reverse phase is not left by bottom surface of light guide plate, then again via reduction fingerprint signal, fingerprint recognition can be carried out, to obtain fingerprint image.The present invention can effectively realize the purpose of fingerprint recognition by above-mentioned means.
Description
Technical field
System of the present invention carries out sensing identification using collimated light source in relation to a kind of image sensing technology, especially with regard to a kind of
Fingerprint image method for sensing.
Background technique
Image recognition application is very wide, apply on biometrics identification technology be even more closeness to life, especially fingerprint recognition,
Its identification that personal identification is carried out using finger print information exclusive on human finger, and then reach the purpose of controlling electronic devices,
And because fingerprint recognition is widely applied due to the advantages of in terms of safety and convenience；Most common at present is exactly to have to refer to
The Smartphone of line identification function, add using fingerprint, unlock.
In the incident light to light guide plate that general optical fingerprint identification technology mainly utilizes light source to be issued, make to be projected to finger
The fingerprint signal of generation is projected to photosensitive element through optical path, and due to the wave crest meeting reflection light of fingerprint, trough can absorb light
Line, therefore, the fingerprint signal reflected to form will form comparison of light and shade striped, and photosensitive element is made to have the function that fingerprint recognition.When
So, fingerprint recognition is not only only limited to this, and a variety of different fingerprint image sensing technologies are respectively developed based on this spirit.
United States Patent (USP) US 2017/0255813 proposes that a kind of image sensing with light guide plate, the image of announcement pass
The use of sensing system system has volume full figure grating (VHG).As shown in Figure 1, multiple light waves 404 after the reflection of thumbprint 406 exist
It can be captured in a spacing distance d on 408 surface of light guide plate, light wave 404 is from 402 diffraction of volume full figure grating, then passes through
Transmitting in light guide plate 408 is crossed, gradually convergence, reverse phase, are then left by the side of light guide plate 408 and be transmitted to imaging sensor
On 410, the result images 403 that imaging sensor 410 senses can finally be transmitted to image processing circuit and software 412 is referred to
Line identifying processing.
It holds, the present invention also proposes that a kind of fingerprint image method for sensing, Lai Youxiao reach fingerprint image sensing and identify it
Effect.
Summary of the invention
The main purpose of the present invention is to provide a kind of fingerprint image method for sensing, utilize at least one-dimensional collimation of amplification
Induction light level fingerprint, with generate collimation fingerprint signal, then will reduce and not the fingerprint signal of reverse phase by light guide plate
Bottom surface is left, and then person the effect of reach optimized fingerprint recognition.
Another object of the present invention is to provide a kind of fingerprint image method for sensing, can sense whole on light guide plate or
Regional area, sensing scope is changeable, therefore widely selects elasticity for designer, and meets the use bullet of user
Property.
In order to achieve the above objectives, fingerprint image method for sensing system of the invention includes the following steps: to provide a collimated light source,
So that it is generated the induction light of at least one-dimensional collimation and enters a light guide plate；According to a fingerprint induction range, amplify in light guide plate
After incuding light, make to incude the corresponding fingerprint to be identified of light, to generate a fingerprint signal；Then small fingerprint is inside contracted in light guide plate
After signal, left from bottom surface of light guide plate.
Above-mentioned fingerprint signal connect can again via reduction fingerprint signal step after, the fingerprint signal after reduction is referred to
Print image identifying processing, to obtain final fingerprint image.
The schema elaborate appended by specific embodiment cooperation below, when being easier to understand the purpose of the present invention, skill
Art content and its it is reached the effect of.
Detailed description of the invention
Fig. 1 is the image sensing schematic diagram of case announcement before United States Patent (USP).
Fig. 2 is the flow chart for the first embodiment that the present invention carries out image sensing.
Fig. 3 is the flow chart for the second embodiment that the present invention carries out image sensing.
Fig. 4 is the flow chart for the 3rd embodiment that the present invention carries out image sensing.
Fig. 5 is the flow chart for the fourth embodiment that the present invention carries out image sensing.
Fig. 6 is the structural schematic diagram for the fingerprint image sensing device that the present invention applies.
The explanation of appended drawing reference: 10- fingerprint image sensing device；12- light guide plate；121- fingerprint sensing region；122- enters
Light end；The first reflecting mirror of 123-；124- goes out light end；The second reflecting mirror of 125-；14- collimated light source；16- restores reflecting mirror；18- figure
As sensor；S10~S15- step；S20~S25- step；S30~S35- step；S40~S45- step；402- volume full figure
Grating；404- light wave；403- result images；406- thumbprint；408- light guide plate；410- imaging sensor；At 412- image
Manage circuit and software；D- spacing distance.
Specific embodiment
The induction light for at least one-dimensional collimation that the present invention is generated using collimated light source enters in light guide plate, to sense leaded light
Fingerprint to be identified on plate, the fingerprint signal allow is by the optical path in light guide plate, effectively from light guide plate bottom
Portion passes, for the subsequent reduction and identification for carrying out fingerprint signal.
Fig. 2 is the flow chart for the first embodiment that the present invention carries out image sensing, as shown, fingerprint image of the invention
Method for sensing system includes following each step: firstly, providing a collimated light source as shown in step S10, can be selected from one-dimensional collimation
Light source or two-dimensional collimation light source, the induction light that collimated light source generates an at least one-dimensional collimation enter a light guide plate, and guide-lighting
The surface of plate is further provided with an at least fingerprint sensing region, and fingerprint sensing region is whole region or the part on the surface of this light guide plate
Region, for placing fingerprint to be identified；It is continuous as shown in step S11, according to the fingerprint induction range of fingerprint sensing region offer,
Amplification induction light in light guide plate, for example, making the characteristic for incuding light therefore optical element using the optical element in light guide plate
And become larger；As shown in step S12, induction light corresponds to the fingerprint to be identified in the fingerprint sensing region on light guide plate, incudes light
Line irradiates fingerprint back reflection to be identified and generates a fingerprint signal；Fingerprint signal continuation is advanced in light guide plate, for another example step S13 institute
Show, after light guide plate inside contracts small fingerprint signal, leaves light guide plate from bottom surface of light guide plate.
After fingerprint signal leaves from bottom surface of light guide plate, as shown in step S14, fingerprint signal reduction is zoomed into originally
Specification；Finally as shown in step S15, Fingerprint recognition processing is carried out to the fingerprint signal after reduction, to obtain fingerprint image.
Fig. 3 is the flow chart for the second embodiment that the present invention carries out image sensing, as shown, fingerprint image of the invention
Method for sensing system includes following each step: firstly, providing an one-dimensional collimated light source as shown in step S20, generating One Dimensional Quasi
Straight induction light enters a light guide plate, and the dimension of this collimation is to enter the average direction of transfer after light guide plate, light guide plate
Surface is equipped with an at least fingerprint sensing region, and fingerprint sensing region can the whole region on the surface of light guide plate or partial zones thus
Domain；Then as shown in step S21, in light guide plate, in the dimension of collimation, amplified using reflection and incude light, such as using
The optical characteristics of reflecting mirror makes the sectional area of the induction light of reflection become larger and amplify, and amplification and collimation are identical dimension at this time
On degree；For another example shown in step S22, induction light corresponds to the fingerprint to be identified in the fingerprint sensing region on light guide plate, incudes light
Line generates a fingerprint signal after reflecting via fingerprint to be identified；The fingerprint signal of generation will continue to advance in light guide plate, then
As shown in step S23, in the dimension of collimation, using reflective reduction fingerprint signal, such as using the optical characteristics of reflecting mirror, make
The sectional area of the induction light of reflection becomes smaller and reduces, and light guide plate leaves from bottom surface of light guide plate in the fingerprint signal system after diminution,
In it is above-mentioned diminution with amplification be identical dimensional.After fingerprint signal leaves from bottom surface of light guide plate, as shown in step S24,
Fingerprint signal reduction is zoomed into script specification；Finally as shown in step S25, fingerprint image is carried out to the fingerprint signal after reduction
Identifying processing, to obtain fingerprint image.
Fig. 4 is the flow chart for the 3rd embodiment that the present invention carries out image sensing, as shown, fingerprint image of the invention
Method for sensing system includes following each step: firstly, providing a collimated light source as shown in step S30, can be selected from One Dimensional Quasi
Direct light source or two-dimensional collimation light source, the induction light that collimated light source generates an at least one-dimensional collimation enters a light guide plate, and leads
The surface of tabula rasa is further provided with an at least fingerprint sensing region, fingerprint sensing region system can the surface of light guide plate thus whole region
Or regional area, for placing fingerprint to be identified；As stated in step s 31, model is incuded according to the fingerprint that fingerprint sensing region provides
It encloses, induction light is amplified to a ratio in light guide plate；For another example shown in step S32, the induction light after amplification is corresponding guide-lighting
The fingerprint to be identified in fingerprint sensing region on plate makes to incude after light irradiates fingerprint to be identified and believe through reflection one fingerprint of generation
Number；The fingerprint signal of generation will continue to advance in light guide plate, for another example shown in step S33, be contracted in light guide plate according to the ratio
After small fingerprint signal, for example, the area in the fingerprint sensing region in light guide plate surface and cutting for induction light can be recycled
Area ratio example generates the fingerprint signal of diminution, then leaves light guide plate from bottom surface of light guide plate.Fingerprint signal after diminution is certainly
After bottom surface of light guide plate leaves, i.e., as shown at step s 34, fingerprint signal reduction is zoomed into script specification；Last such as step S35
It is shown, Fingerprint recognition processing is carried out to the fingerprint signal after reduction, to obtain corresponding fingerprint image.
Fig. 5 is the flow chart for the fourth embodiment that the present invention carries out image sensing, as shown, fingerprint image of the invention
Method for sensing includes following each step:, can be selected from one-dimensional or two firstly, provide a collimated light source as shown in step S40
Collimated light source is tieed up, the induction light that collimated light source generates an at least one-dimensional collimation enters a light guide plate, and the surface of light guide plate is more
Equipped with an at least fingerprint sensing region, fingerprint sensing region system can be the whole region or regional area of light guide plate surface, for
Place fingerprint to be identified；As shown in step S41, induction light is amplified according to a ratio continuous reflection in light guide plate, and this is put
Big ratio system is related with the thickness of the area in fingerprint sensing region, the angle of reflection and light guide plate；For another example shown in step S42,
On fingerprint to be identified in the corresponding fingerprint sensing region being radiated on light guide plate of induction light, produced after fingerprint to be identified reflection
A raw fingerprint signal；This subsequent fingerprint signal will continue to advance in light guide plate, for another example shown in step S43, according to the ratio,
Continuous reflection reduces in light guide plate, after the fingerprint signal for generating at least one-dimensional collimation, leaves light guide plate from bottom surface of light guide plate.Work as finger
After line signal leaves from bottom surface of light guide plate, as shown in step S44, fingerprint signal reduction is zoomed into script specification；Finally such as
Shown in step S45, Fingerprint recognition processing is carried out to the fingerprint signal after reduction, to obtain corresponding fingerprint image.
Wherein, collimation of the invention may be one-dimensional collimation or two-dimensional collimation, and the dimension of one-dimensional collimation, as fingerprint are believed
Average direction of transfer number in light guide plate.The collimation deviation permissible range of induction light or fingerprint signal direction of advance about exists
Between ± 0.25~± 0.5 degree, radial direction does not have special restriction (about ± 10 degree or so) then.
After the various state sample implementations for having illustrated fingerprint image method for sensing of the invention, connecting illustrates of the invention specific
The fingerprint image sensing device of application, as shown in fig. 6,10 system of a fingerprint image sensing device includes: a light guide plate 12, table
Face system is equipped with an at least fingerprint sensing region 121, is herein and the fingerprint sensing region 121 by taking a fingerprint sensing region as an example
System can be the whole region or regional area on the surface of light guide plate 12, for placing a fingerprint 20 to be identified；Light guide plate 12 it
Light inputting end 122 is equipped with one first reflecting mirror 123, and is then equipped with one second reflecting mirror 125 at the light end 124 that goes out of light guide plate 12.One
The setting of 14 system of collimated light source faces 122 bottom surface of light inputting end of light guide plate 12, allows collimated light source 14 towards the bottom of light guide plate 12
Face, to generate the induction light of an at least one-dimensional collimation, collimated light source 14 can be one-dimensional collimated light source or two-dimensional collimation light source, example
Such as laser (Laser) or vertical cavity surface emitting laser (VCSEL).When collimated light source 14 generates an induction light, sense
It answers light that can enter light guide plate 12 from light inputting end 122, is incident on after the reflection amplification of the first reflecting mirror 123 positioned at fingerprint sensing area
Fingerprint to be identified 20 on domain 121, generates a fingerprint signal after fingerprint 20 to be identified reflection, and fingerprint signal continues in light guide plate
It advances in 12 toward 124 direction of light end out, then through 125 reflective reduction of the second reflecting mirror, the fingerprint signal after diminution is then according to optics road
Diameter leaves light guide plate 12 from the bottom surface of light guide plate 12.It is further provided with a reduction reflecting mirror 16 in going out below light end 124 for light guide plate 12,
The fingerprint signal left from 12 bottom surface of light guide plate can march to reduction reflecting mirror 16, and restore fingerprint using reduction reflecting mirror 16 and believe
Number.Separately there is the setting of 18 system of an imaging sensor in 12 bottom surface of light guide plate and the position of corresponding reduction reflecting mirror 16, has been gone back with receiving
Former fingerprint signal, and Fingerprint recognition processing is carried out to fingerprint signal, to obtain fingerprint image.Wherein, the first reflecting mirror
123, the angle system of the second reflecting mirror 125 and corresponding 12 bottom surface of light guide plate of reduction reflecting mirror 16 depends on fingerprint sensing region 121
Area and collimated light source 14 sectional area ratio.
Specifically, the sectional area of collimated light source 14 is 1mm* in the fingerprint image sensing device 10 of real case
1mm, it is 10mm*10mm that the fingerprint in fingerprint sensing region 121, which captures area, and it is 6mm* that imaging sensor 18, which captures image range,
4mm (abandons the fingerprint signal compared with outside), the first reflecting mirror 123, the second reflecting mirror 125 and reduction reflecting mirror 16 and light guide plate 12
Positive angle be 40 degree (about zooming in or out 10 times) and 12 side of light guide plate with a thickness of 1mm, these ranges are only
Concrete case of the invention, when cannot be still to depending on actual demand as limit.
Furthermore if the first reflecting mirror 123 of light inputting end 122 and 12 bottom surface angle of light guide plate are in 78 degree, reflection amplification can be connect
Nearly 5 times, reflection amplification twice in succession can reach 25 times, space needed for so can substantially reducing light source.The of light end 124 out
Two-mirror 125 takes symmetric design relative to light inputting end 122, can by the space reduction shared by fingerprint signal become 1/25 after from
Convince light version 12 by patient analysis.Fingerprint signal after diminution penetrate and out second reflecting mirror 125 at light end 124 to being referred to as reduction reflecting mirror 16,
The fingerprint signal of original size is reduced on the receiving plane of imaging sensor 18.
In conclusion fingerprint image method for sensing proposed by the present invention, carries out fingerprint biography using the collimated light source of amplification
Sense to generate the fingerprint signal of collimation, then the fingerprint signal after diminution is left by light guide plate bottom, to provide sequential reduction knowledge
Not, and then reach optimized fingerprint recognition effect.Therefore, the present invention using reduce and not the fingerprint signal of reverse phase from leaded light
The bottom surface of plate is left, this technical characteristic and patent case above-mentioned are entirely different, along with the present invention can sense on light guide plate
Whole or regional area, sensing scope is changeable, therefore for designer's wider design alternative elasticity, and can meet and make
User's uses elasticity.
The technical idea and feature that embodiment described above is illustrative of the invention, purpose make those skilled in the art
Member cans understand the content of the present invention and implement it accordingly, when cannot limit claim of the invention, i.e., Yi Benfa generally with it
The equivalent change or modification that bright disclosed spirit is made, should cover in claim of the invention.
Claims (6)
1. a kind of fingerprint image method for sensing, which comprises the following steps:
A collimated light source is provided, the induction light sensing light for generating at least one-dimensional collimation enters a light guide plate；
According to a fingerprint induction range, amplify the induction light in the light guide plate；
The induction light corresponds to a fingerprint to be identified, generates a fingerprint signal；And
After reducing the fingerprint signal in the light guide plate, the light guide plate is left from the bottom surface of light guide plate.
2. fingerprint image method for sensing as described in claim 1, which is characterized in that further include following steps: restoring the fingerprint
Signal.
3. fingerprint image method for sensing as claimed in claim 2, which is characterized in that further include following steps: after reduction
The fingerprint signal carries out image recognition processing, to obtain a fingerprint image.
4. fingerprint image method for sensing as described in claim 1, which is characterized in that the collimated light source be one-dimensional collimated light source or
Two-dimensional collimation light source.
5. fingerprint image method for sensing as described in claim 1, which is characterized in that the surface of the light guide plate is further provided at least one
Fingerprint sensing region, to provide the fingerprint induction range.
6. fingerprint image method for sensing as claimed in claim 5, which is characterized in that the fingerprint sensing region is the light guide plate
The whole region or regional area on the surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910125666.2A CN110020594A (en) | 2019-02-20 | 2019-02-20 | Fingerprint image method for sensing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910125666.2A CN110020594A (en) | 2019-02-20 | 2019-02-20 | Fingerprint image method for sensing |
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| Publication Number | Publication Date |
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| CN110020594A true CN110020594A (en) | 2019-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910125666.2A Withdrawn CN110020594A (en) | 2019-02-20 | 2019-02-20 | Fingerprint image method for sensing |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108009533A (en) * | 2018-01-04 | 2018-05-08 | 敦捷光电股份有限公司 | Optical fingerprint identification system |
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- 2019-02-20 CN CN201910125666.2A patent/CN110020594A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108009533A (en) * | 2018-01-04 | 2018-05-08 | 敦捷光电股份有限公司 | Optical fingerprint identification system |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20220119 Address after: 802 Hibiscus Road, West Bay Avenue, Grand Cayman, Cayman Islands Applicant after: FOCALTECH ELECTRONICS, Ltd. Address before: Ky1-9006 Room 102, Connaught street, P.O. Box 712, North sound Road, Georgetown, Grand Cayman Applicant before: Dunjie Optoelectronics (Cayman) Co.,Ltd. |
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Application publication date: 20190716 |
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