CN110020595A - Fingerprint image method for sensing - Google Patents
Fingerprint image method for sensing Download PDFInfo
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- CN110020595A CN110020595A CN201910126349.2A CN201910126349A CN110020595A CN 110020595 A CN110020595 A CN 110020595A CN 201910126349 A CN201910126349 A CN 201910126349A CN 110020595 A CN110020595 A CN 110020595A
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- fingerprint
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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
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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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
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
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- Theoretical Computer Science (AREA)
- Optics & Photonics (AREA)
- Image Input (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
The 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, the induction light level fingerprint amplified in light guide plate according to a ratio continuous reflection, to generate the fingerprint signal of collimation, further according to the ratio, in light guide plate after continuous reflection reduces the fingerprint signal for generating at least one-dimensional collimation, it will reduce again and the fingerprint signal of reverse phase do not left by bottom surface of light guide plate, then again via reduction fingerprint signal, identification of fingerprint can be carried out, to obtain fingerprint image.The present invention can effectively realize the purpose of identification of fingerprint by above-mentioned means.
Description
Technical field
The present invention is in relation to a kind of image sensing technology, especially with regard to a kind of finger for carrying out sensing identification using collimated light source
Print image method for sensing.
Background technique
Image identification application is very wide, apply on biometrics identification technology be even more closeness to life, especially identification of fingerprint,
Its identification that personal identification is carried out using fingerprint message exclusive on human finger, and then achieve the purpose that controlling electronic devices,
And because identification of fingerprint 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 discriminating function, add using fingerprint, unlock.
In the incident light to light guide plate that general optical finger print identification technique 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 identification of fingerprint.When
So, identification of fingerprint 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 a kind of image sensing with light guide plate, and the image disclosed passes
Sensing system use has volume full figure grating (VHG).As shown in Figure 1, through thumbprint 406 reflection after multiple light waves 404 away from
From can be captured in a spacing distance d on 408 surface of light guide plate, light wave 404 from 402 diffraction of volume full figure grating, using
Transmitting in light guide plate 408, gradually convergence, reverse phase, are then left by the side of light guide plate 408 and are transmitted to imaging sensor 410
On, the result images 403 that imaging sensor 410 senses can finally be transmitted to image processing circuit and software 412 carries out shadow and refers to
Line identification processing.
It holds, the present invention also proposes that a kind of fingerprint image method for sensing, Lai Youxiao reach what fingerprint image was sensed and recognized
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 the effect of reach the identification of fingerprint of optimization.
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 it is elastic to meet using for user.
In order to achieve the above objectives, fingerprint image method for sensing provided by the invention includes the following steps: to provide a collimated light
Source makes it generate the induction light of at least one-dimensional collimation and enters a light guide plate；It is put in light guide plate according to a ratio continuous reflection
After big induction light, make to incude the corresponding fingerprint to be identified of light, to generate a fingerprint signal；Then basis should in light guide plate
Ratio continuous reflection reduces, and after the fingerprint signal to generate at least one-dimensional collimation, leaves 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 identification processing, to obtain final fingerprint image.
Wherein, induction light reflection amplification ratio and light guide plate surface on fingerprint sensing region area, reflection
The thickness of angle and light guide plate is related.
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.
Description of symbols: 10- fingerprint image sensing device；12- light guide plate；121 fingerprint sensing regions；122 light inputting ends；
123 first reflecting mirrors；124 go out light end；125 second reflecting mirrors；14- collimated light source；16- restores reflecting mirror；18- image sensing
Device；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；412- image processing circuit
And software；D- interval 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 provided by the invention
Image sensing method includes following each step: firstly, providing a collimated light source as shown in step S10, 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 the region whole region on the surface of light guide plate or office thus
Portion 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,
The amplification induction light in light guide plate, for example, making the spy for incuding light therefore optical element using the optical element in light guide plate
Property 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 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
It is shown, after light guide plate inside contracts small fingerprint signal, light guide plate is left 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 image identification 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 includes following each step: firstly, providing an one-dimensional collimated light source as shown in step S20, generating one-dimensional collimation
Induction light enter a light guide plate, dimension of this collimation is to enter the average direction of transfer after light guide plate, the table of light guide plate
Face 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 amplifies at this time and collimates in identical dimensional
On；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
A fingerprint signal is generated after reflecting via fingerprint to be identified；The fingerprint signal of generation will continue to advance in light guide plate, for another example
Shown in step S23, in the dimension of collimation, using reflective reduction fingerprint signal, such as using the optical characteristics of reflecting mirror, make anti-
The sectional area for the induction light penetrated becomes smaller and reduces, and the fingerprint signal after diminution leaves light guide plate from bottom surface of light guide plate, wherein before
The diminution and amplification stated are in identical dimensional.After fingerprint signal leaves from bottom surface of light guide plate, as shown in step S24, by fingerprint
Signals revivification zooms into script specification；Finally as shown in step S25, the fingerprint signal after reduction is carried out at fingerprint image identification
Reason, 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 includes following each step: firstly, providing a collimated light source as shown in step S30, 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 can the whole region on the surface of light guide plate or office thus
Portion region, for placing fingerprint to be identified；As stated in step s 31, the fingerprint induction range provided according to fingerprint sensing region,
Induction light is amplified to a ratio in light guide plate；For another example shown in step S32, amplified induction light is corresponded on light guide plate
Fingerprint to be identified in fingerprint sensing region makes to incude after light irradiates fingerprint to be identified and is reflected one fingerprint signal of generation；It produces
Raw fingerprint signal will continue to advance in light guide plate, for another example shown in step S33, according to the scale smaller fingerprint in light guide plate
After signal, for example, the area in the fingerprint sensing region in light guide plate surface can be recycled and incude the sectional area of light
Ratio generates the fingerprint signal of diminution, then leaves light guide plate from bottom surface of light guide plate.Fingerprint signal after diminution is from light guide plate
After bottom surface is left, i.e., as shown at step s 34, fingerprint signal reduction is zoomed into script specification；Finally as shown in step S35,
Fingerprint image identification 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 can be the whole region or regional area of light guide plate surface, for putting
Set fingerprint to be identified；As shown in step S41, induction light, and the amplification are amplified according to a ratio continuous reflection in light guide plate
Ratio it 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, induction
On fingerprint to be identified in the corresponding fingerprint sensing region being radiated on light guide plate of light, one is generated after fingerprint to be identified reflection
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, in leaded light
Continuous reflection reduces in plate, after the fingerprint signal for generating at least one-dimensional collimation, leaves light guide plate from bottom surface of light guide plate.When fingerprint is believed
After number leaving from bottom surface of light guide plate, as shown in step S44, fingerprint signal reduction is zoomed into script specification；Last such as step
Shown in S45, fingerprint image identification 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, a fingerprint image sensing device 10 includes: a light guide plate 12, surface
Equipped with an at least fingerprint sensing region 121, herein by taking a fingerprint sensing region as an example, and fingerprint sensing region 121 can be to lead
The whole region or regional area on the surface of tabula rasa 12, for placing a fingerprint 20 to be identified；In the light inputting end 122 of light guide plate 12
One second reflecting mirror 125 is then equipped with equipped with one first reflecting mirror 123, and at the light end 124 that goes out of light guide plate 12.One collimated light source 14
122 bottom surface of light inputting end in face of light guide plate 12 is set, allows collimated light source 14 towards the bottom surface of light guide plate 12, with generate one to
The induction light of few one-dimensional collimation, collimated light source 14 can be one-dimensional collimated light source or two-dimensional collimation light source, such as laser (Laser)
Or vertical cavity surface emitting laser (VCSEL) (VCSEL) etc..When collimated light source 14 generates an induction light, induction light can enter certainly
Light end 122 enter light guide plate 12, through the first reflecting mirror 123 reflection amplification after be incident on fingerprint sensing region 121 to
Fingerprint 20 is recognized, a fingerprint signal is generated after fingerprint 20 to be identified reflection, fingerprint signal continues in light guide plate 12 toward light out
124 directions are held to advance, then through 125 reflective reduction of the second reflecting mirror, fingerprint signal after diminution is then according to optical path from light guide plate
Leave light guide plate 12 in 12 bottom surface.It is further provided with a reduction reflecting mirror 16 in going out below light end 124 for light guide plate 12, from light guide plate 12
The fingerprint signal that bottom surface is left can march to reduction reflecting mirror 16, and restore fingerprint signal using reduction reflecting mirror 16.Separately have one
The position of 12 bottom surface of light guide plate and corresponding reduction reflecting mirror 16 is arranged in imaging sensor 18, to receive as-reduced fingerprint letter
Number, and fingerprint image identification processing is carried out to fingerprint signal, to obtain fingerprint image.Wherein, the first reflecting mirror 123, second is anti-
The angle penetrated mirror 125 and restore corresponding 12 bottom surface of light guide plate of reflecting mirror 16 depends on the area and collimation in fingerprint sensing region 121
The ratio of the sectional area of light source 14.
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 penetrates and second reflecting mirror 125 at light end 124 symmetrically restores reflecting mirror 16 out,
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, is distinguished with providing sequential reduction
Know, and then reaches the identification of fingerprint effect of optimization.Therefore, the present invention using reduce and not the fingerprint signal of reverse phase from light guide plate
Bottom surface leave, 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 the wider design alternative elasticity of designer, and user can be met
Using elasticity.
Embodiment described above is merely illustrative of the invention's technical idea and feature, and purpose makes to be familiar with technique
Person cans understand the content of the present invention and implement it accordingly, when cannot be limited the scope of protection of the present invention with it, i.e., Yi Benfa generally
Equivalent change or modification made by bright revealed spirit, should be included within the scope of protection of the present invention.
Claims (7)
1. a kind of fingerprint image method for sensing, which comprises the following steps:
A collimated light source is provided, the induction light for generating at least one-dimensional collimation enters a light guide plate；
According to a ratio, continuous reflection amplifies the induction light in the light guide plate；
The induction light corresponds to a fingerprint to be identified, generates the fingerprint signal of a collimation；And
According to the ratio, continuous reflection reduces in the light guide plate, after the fingerprint signal to generate at least one-dimensional collimation, from this
Bottom surface of light guide plate leaves the 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 identification processing, to obtain a fingerprint image.
4. 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, for placing the fingerprint to be identified.
5. fingerprint image method for sensing as claimed in claim 4, which is characterized in that the face of the ratio and the fingerprint sensing region
The thickness of product, the angle of the reflection and the light guide plate is related.
6. fingerprint image method for sensing as claimed in claim 4, which is characterized in that the fingerprint sensing region is the light guide plate
The whole region or regional area on the surface.
7. 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910126349.2A CN110020595A (en) | 2019-02-20 | 2019-02-20 | Fingerprint image method for sensing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910126349.2A CN110020595A (en) | 2019-02-20 | 2019-02-20 | Fingerprint image method for sensing |
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| CN110020595A true CN110020595A (en) | 2019-07-16 |
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| CN201910126349.2A Withdrawn CN110020595A (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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| 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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Effective date of registration: 20220118 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 |