CN109782380A - A kind of iris imaging system and iris recognition mould group - Google Patents
A kind of iris imaging system and iris recognition mould group Download PDFInfo
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- CN109782380A CN109782380A CN201910196142.2A CN201910196142A CN109782380A CN 109782380 A CN109782380 A CN 109782380A CN 201910196142 A CN201910196142 A CN 201910196142A CN 109782380 A CN109782380 A CN 109782380A
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- iris
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Abstract
The invention discloses a kind of iris imaging systems, including preceding constituent element, zoom constituent element and rear constituent element；Iris imaging optical system of the invention is the imaging system that conventional optical systems are combined with liquid optical system, in short distance wide operating range, has good image quality, low distortion performance；The diopter for changing zoom constituent element is driven by external voltage signal, realizes auto-focusing in conjunction with image intelligent algorithm, and focusing speed is fast, long service life；Imaging system is simple and compact for structure, and adjustment is convenient, low in cost.
Description
Technical field
The present invention relates to field of biological recognition, a kind of iris imaging system and iris recognition mould group are particularly related to.
Background technique
Iris recognition belongs to field of biological recognition, is a kind of biological identification technology based on iris, passes through optical system
System collects iris image texture information and is handled to authenticate user identity.Compared to other biological identification technology such as fingerprint etc.
With the remarkable advantages such as untouchable, stability is good, become one of accurate identification technology in current identity characteristic.And iris recognition
The realization difficult point of technology is the iris image of clear high quality how is collected under the premise of different user is comfortable, therefore adopts
The optical system for collecting the iris image of high quality becomes the key point of iris identification equipment.
Existing iris capturing optical system mainly has three classes fixed-focus optical system, traditional zoom optical system and liquid light
System.Fixed-focus optical system has the advantages that good imaging quality system is simple, low in cost, but there are operating distance lists
One, use scope is limited.Traditional zoom optical system can take into account the demand of different operating distance range, but due to system bulk
It is larger, structure is complicated, cost is expensive, mechanical zoom is prone to wear the service life has the shortcomings that short to be unfavorable for promoting.Have at one
In the embodiment of body, iris imaging camera lens includes two panels lens, but the iris imaging lens optical design freedom is lower, is not easy
In control optical aberration, lens imaging is second-rate.In another specific embodiment, iris imaging camera lens includes that three pieces are saturating
Mirror, wherein the first lens, the second lens are glued mirror, and the third lens are rotational symmetric aspheric mirror.With with two panels lens knot
The iris imaging camera lens of structure is compared, and the iris imaging camera lens of three pieces lens increases optical design freedom, using aspherical
Lens control the spherical aberration of optical imaging system to a certain extent, improve image quality, but that there are lens processing technologys is complicated,
Entire optical imaging system overall length is too long, and occupied space is larger.
Although liquid optics can preferably take into account the advantages of above two system, previous liquid optical system exists
Following problems: operating distance range is expanded but still less than normal, and image quality is poor, dark images, using under external light source
Time for exposure is compared with long, volume is big.Therefore good imaging quality, repeated acquisition image number is high, structure is simply at low cost, operating distance
The liquid optical system that range is wide, luminous flux is big, volume compact is small and exquisite becomes the emphasis studied at present.
Summary of the invention
The present invention provides the iris imaging systems that a kind of conventional optical systems are combined with liquid optical system, are a kind of
Operating distance range is wide, good imaging quality, the high iris imaging system of cost performance and iris recognition mould group.
Technical solution of the present invention: a kind of iris imaging system, including what is set gradually by object side to image side: preceding constituent element,
Zoom constituent element and rear constituent element；
The preceding constituent element includes the first lens being positive by the focal power that object side to image side is set gradually, what focal power was positive
Second lens, light focus is away from the third lens being negative；
Zoom constituent element is made of the liquid lens that focal power can be changed；
Constituent element includes the light focus that is set gradually by object side to image side away from the 5th lens being negative afterwards, and light focus is away from the 6th to be positive
Lens, the 8th lens that light focus is positive away from the 7th lens being negative and focal power；
5th lens, the 6th lens and the 7th lens gluing form the first balsaming lens group.
Preferably, the focal length of the preceding constituent element is fG1, and the focal length of the zoom constituent element is fG2, the focal length of the rear constituent element
For fG3, when the light focus of zoom constituent element is away from being 0, the focal length of optical system is f, meet 5 < | fG1/f |, 0.4 < | fG3/f | <
1.0,|fG2|>40。
Preferably, the focal length of first lens is f1, and the focal length of the second lens is f2, and the focal length of the third lens is f3,
The focal length when zoom constituent element focal power is 0 of optical system is f, satisfaction 0.8 < | f1/f | < 1.2,0.8 < | f2/f | < 1.3,
0.05<|f3/f|<0.7。
Preferably, the 8th lenses outer diameter value is D8, and the exit pupil diameter of optical system is EP, meets 0.5 < D8/
EP<1.6。
Preferably, setting is used to control the diaphragm by how many light ray energy between the third lens and the 5th lens,
The diaphragm can indirectly influence the analytic ability of optical system, to ensure that certain by the power of control light
Image resolution ability.
Preferably, first lens and the second index of refraction in lens parameter are respectively nd1, nd2, meet 0.95 < nd1/nd2
<1.15。
Preferably, near infrared light can be enhanced by being provided between first lens front or the 8th lens and imaging surface
Through the bandpass filter that reduction visible light passes through, camera lens is improved near infrared band transmitance, so that spectrum is in image sensing
Response curve and light source spectrum curve on device is most identical, so that it is best to reach iris image image quality.
A kind of iris recognition mould group including the iris imaging system, which is characterized in that the iris recognition mould group, packet
The iris imaging system is included, and is provided with CCD or cmos image sensor at the image planes in the iris imaging system.
A kind of beneficial effects of the present invention: iris imaging that conventional optical systems are combined with liquid optical system of the present invention
System, operating distance range is wide, good imaging quality, and cost performance is high, while iris imaging optical system is in closely wide work
In range, still there is good image quality, low distortion performance；It is driven by external voltage signal and changes bending for zoom constituent element
Auto-focusing may be implemented in conjunction with image intelligent algorithm in luminosity, and focusing speed is fast, long service life；Imaging system structure
Simple and compact, adjustment is convenient, low in cost；And the imaging modules can allow using different spectral near-infrared LED light source and
Different cmos image sensing devices, to meet the iris recognition application under varying environment occasion.
It should be appreciated that aforementioned description substantially and subsequent detailed description are exemplary illustration and explanation, it should not
As the limitation to the claimed content of the present invention.
Detailed description of the invention
With reference to the attached drawing of accompanying, the more purposes of the present invention, function and advantage are by the as follows of embodiment through the invention
Description is illustrated, in which:
Fig. 1 shows schematically imaging system structural schematic diagram of the invention.
Fig. 2 a~Fig. 2 b shows schematically optics when imaging system embodiment operating distance of the invention is 1000mm
Performance map, wherein Fig. 2 a is the MTF transfer function characteristics curve graph for being embodiment, and Fig. 2 b is the place distortion curve of embodiment
Figure.
Fig. 3 a~Fig. 3 b shows schematically optical when imaging system embodiment operating distance of the invention is 612mm
It can scheme, wherein Fig. 3 a is the MTF transfer function characteristics curve graph for being embodiment, and Fig. 3 b is the place distortion curve of embodiment.
The optics that Fig. 4 a~Fig. 4 b is shown schematically when being 297mm for imaging system embodiment operating distance of the invention
Performance map, wherein Fig. 4 a is the MTF transfer function characteristics curve graph for being embodiment, and Fig. 4 b is the place distortion curve of embodiment
Figure.
Specific embodiment
By reference to exemplary embodiment, the purpose of the present invention and function and the side for realizing these purposes and function
Method will be illustrated.However, the present invention is not limited to exemplary embodiment as disclosed below；Can by different form come
It is realized.The essence of specification is only to aid in those skilled in the relevant arts' Integrated Understanding detail of the invention.
Hereinafter, the embodiment of the present invention will be described with reference to the drawings.In the accompanying drawings, identical appended drawing reference represents identical
Or similar component or same or like step.
The present invention provides a kind of iris imaging system, as shown in Figure 1, including being set gradually by object side to image side: preceding group
First G1, zoom constituent element G2 and rear constituent element G3.
The preceding constituent element G1 includes the first lens 1 being positive by the focal power that object side to image side is set gradually, and focal power is
The second positive lens 2, light focus is away from the third lens 3 being negative.
The liquid lens 4 that zoom constituent element G2 can be changed by focal power is constituted.
Afterwards constituent element G3 includes the light focus that is set gradually by object side to image side away from the 5th lens 5 being negative, and light focus is away from being positive
6th lens 6, the 8th lens 8 that light focus is positive away from the 7th lens 7 being negative and focal power.
First balsaming lens group C1 of 5th lens 5, the 6th lens 6 and the glued formation of the 7th lens 7.
The focal length of the preceding constituent element G1 is fG1, and the focal length of the zoom constituent element G2 is fG2, the focal length of the rear constituent element G3
For fG3, when the light focus of zoom constituent element G2 is away from being 0, the focal length of optical system is f, meet 5 < | fG1/f |, 0.4 < | fG3/f | <
1.0,|fG2|>40
The focal length of first lens 1 is f1, and the focal length of the second lens 2 is f2, and the focal length of the third lens 3 is f3, optics
The focal length when zoom constituent element G2 focal power is 0 of system is f, satisfaction 0.8 < | f1/f | < 1.2,0.8 < | f2/f | < 1.3,0.05
<|f3/f|<0.7
8th lens, the 8 eyeglass outer diameter value is D8, and the exit pupil diameter of optical system is EP, meets 0.5 < D8/EP < 1.6.
When imaging system meets above-mentioned relation, the volume compact of imaging lens can be made small and exquisite, reduce system manufacturing cost, realized
The miniaturization of iris identification device.
Preferably, setting is used to control the diaphragm by how many light ray energy between the third lens 3 and the 5th lens 5.It should
Diaphragm can indirectly influence the analytic ability of optical system, to ensure that certain image by the power of control light
Resolution capability.
First lens 1 and 2 refractive index parameter of the second lens are respectively nd1, nd2, meet 0.95 < nd1/nd2 <
1.15.When optical system uses above-mentioned refractive indices, spherical aberration of the different operating under can be balanced and changed to obtain difference
Good image quality when operating distance, and it is low in cost to draw materials.
Near infrared light can be enhanced by being provided between 1 front end of the first lens of imaging system or the 8th lens 8 and imaging surface
Through the bandpass filter that reduction visible light passes through, camera lens is improved near infrared band transmitance, so that spectrum is in image sensing
Response curve and light source spectrum curve on device is most identical, so that it is best to reach iris image image quality.
A kind of iris recognition mould group, including the iris imaging system, and in the image planes in the iris imaging system
Place is provided with CCD or cmos image sensor.
Embodiment
Now by iris imaging system embodiment operating distance of the invention respectively in 1000mm, 612mm, 297mm for explain
State its attainable actual effect.
When operating distance is 1000mm, it can be seen that camera lens MTF transfer curve is compact straight from Fig. 2 a, all views
For curvature of field line in the corresponding axis of ordinates dispersion of 80lp/mm less than 1 lattice, minimum MTF curve is greater than 0.5 at 80lp/mm.And with
Modulating transfer function value (the Modulus of the OTF) ordinate in left side and the line of lower section are to frequency
The area in (Spatialfrequency in cycles per mm) abscissa besieged city agrees to the greatest extent the more of energy, illustrates the system in institute
Have that the image quality under visual field is excellent and consistency is good, iris image is whole uniformly without particularly poor region.It can from Fig. 2 b
The curvature of field to imaging system is significantly less than 0.1mm, and together, greatest optical relative distortion is also bright for optics relative distortion curve co-insides
It shows less than 1%.
When operating distance is 612mm, it can be seen that camera lens MTF transmission function opposing curves are compact straight from Fig. 3 a, institute
There is visual field curve in the corresponding axis of ordinates dispersion of 80lp/mm less than 1.5 lattice, minimum MTF curve is greater than at 80lp/mm
0.5.And with the modulating transfer function value in left side (Modulus of the OTF) ordinate and the line of lower section to frequency
The area in (Spatial frequency in cycles per mm) abscissa besieged city agrees to the greatest extent the more of energy, illustrates the system in institute
Have that the image quality under visual field is excellent and consistency is good, iris image is whole uniformly without particularly poor region.It can from Fig. 3 b
The curvature of field to imaging system is significantly less than 0.1mm, and together, greatest optical relative distortion is also bright for optics relative distortion curve co-insides
It shows less than 1%.
When operating distance is 297mm, it can be seen that camera lens MTF transfer curve relative compact is straight from Fig. 4 a, institute
There is visual field curve in the corresponding axis of ordinates dispersion of 80lp/mm less than 1.5 lattice, minimum MTF curve is greater than at 80lp/mm
0.5.And with the modulating transfer function value in left side (Modulus of the OTF) ordinate and the line of lower section to frequency
The area in (Spatial frequency in cycles per mm) abscissa besieged city agrees to the greatest extent the more of energy, illustrates the system in institute
Have that the image quality under visual field is excellent and consistency is good, iris image is whole uniformly without particularly poor region.It can from Fig. 4 b
To imaging system the curvature of field be significantly less than 0.1mm and each curve of spectrum of the curvature of field registration it is good, optics relative distortion curve co-insides
Together, greatest optical relative distortion is also significantly less than 1%.
To sum up contrast and experiment is it is found that iris imaging system and its iris recognition mould group of the invention sets iris recognition
Standby operating distance expands to 297-1000mm range from general 1000mm, which is main using area and each work
The image quality made at distance is excellent, and camera lens MTF transfer curve relative compact is straight, and minimum MTF curve is in 80lp/mm
Place is greater than 0.5, and the imaging system curvature of field is significantly less than 0.1mm, and optics relative distortion is significantly less than 1%, meets Algorithm of Iris Recognition
To the identification demand of the collected iris image of front equipment end.In addition, be less than 297mm or be greater than 1000mm also can well at
Picture not only expands working range and has changed and improved user's use feeling, also provides for the software and hardware upgrading of post facility
Required space.
The foregoing is merely the preferred embodiment of the present invention, it should be pointed out that is not intended to limit the invention, for this skill
For the engineering personnel in art field, all within the spirits and principles of the present invention, made any modification, equivalent replacement,
Improve etc., it should be included within protection category of the invention.
In conjunction with the explanation and practice of the invention disclosed here, the other embodiment of the present invention is for those skilled in the art
It all will be readily apparent and understand.Illustrate and embodiment is regarded only as being exemplary, true scope of the invention and purport are equal
It is defined in the claims.
Claims (8)
1. a kind of iris imaging system, including what is set gradually by object side to image side: preceding constituent element, zoom constituent element and rear constituent element；
The preceding constituent element includes the first lens being positive by the focal power that object side to image side is set gradually, focal power be positive second
Lens, light focus is away from the third lens being negative；
Zoom constituent element is made of the liquid lens that focal power can be changed；
Constituent element includes the light focus that is set gradually by object side to image side away from the 5th lens being negative afterwards, and light focus is saturating away from the 6th to be positive
Mirror, the 8th lens that light focus is positive away from the 7th lens being negative and focal power；
5th lens, the 6th lens and the 7th lens gluing form the first balsaming lens group.
2. iris imaging system according to claim 1, which is characterized in that the focal length of the preceding constituent element is fG1, the change
The focal length of burnt constituent element is fG2, and the focal length of the rear constituent element is fG3, when the light focus of zoom constituent element is away from being 0, the coke of optical system
Away from for f, meet 5<| fG1/f |, 0.4<| fG3/f |<1.0, | fG2 |>40.
3. iris imaging system according to claim 1, which is characterized in that the focal length of first lens be f1, second
The focal length of lens is f2, and the focal length of the third lens is f3, and the focal length when zoom constituent element focal power is 0 of optical system is f, full
Foot 0.8 < | f1/f | < 1.2,0.8 < | f2/f | < 1.3,0.05 < | f3/f | < 0.7.
4. iris imaging system according to claim 1, which is characterized in that the 8th lenses outer diameter value is D8,
The exit pupil diameter of optical system is EP, meets 0.5 < D8/EP < 1.6.
5. iris imaging system according to claim 1, which is characterized in that set between the third lens and the 5th lens
It sets for controlling the diaphragm by how many light ray energy, the diaphragm can indirectly influence light by the power of control light
The analytic ability of system, to ensure that certain image resolution ability.
6. iris imaging system according to claim 1, which is characterized in that first lens and second index of refraction in lens
Parameter is respectively nd1, nd2, meets 0.95 < nd1/nd2 < 1.15.
7. iris imaging system according to claim 1, which is characterized in that in first lens front or the 8th lens
The bandpass filter that near infrared light passes through through reduction visible light can be enhanced by being provided between imaging surface, improve camera lens close
Infrared band transmitance, so that the response curve of spectrum on the image sensor and light source spectrum curve are most identical, to reach
Iris image image quality is best.
8. a kind of iris recognition mould group of claim 1~7 any one iris imaging system, which is characterized in that the iris
It identifies mould group, including the iris imaging system, and is provided with CCD or CMOS at the image planes in the iris imaging system
Imaging sensor.
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Cited By (5)
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| WO2021157959A1 (en) * | 2020-02-05 | 2021-08-12 | 엘지이노텍 주식회사 | Imaging lens |
| US11125979B2 (en) | 2019-08-14 | 2021-09-21 | Largan Precision Co., Ltd. | Optical photographing lens assembly comprising a component of variable refractive powers, image capturing unit and electronic device |
| CN113885167A (en) * | 2021-09-01 | 2022-01-04 | 苏州协尔智能光电有限公司 | Fixed-focus imaging system and fixed-focus imaging lens |
| US11366294B2 (en) | 2019-07-17 | 2022-06-21 | Largan Precision Co., Ltd. | Optical imaging lens assembly, image capturing unit and electronic device |
| CN114924376A (en) * | 2022-06-13 | 2022-08-19 | 苏州协尔智能光电有限公司 | Cylindrical lens optical system |
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