CN102622586A - Iris-acquisition optical system for assisting focusing by utilizing visible light - Google Patents
Iris-acquisition optical system for assisting focusing by utilizing visible light Download PDFInfo
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- CN102622586A CN102622586A CN2012100586273A CN201210058627A CN102622586A CN 102622586 A CN102622586 A CN 102622586A CN 2012100586273 A CN2012100586273 A CN 2012100586273A CN 201210058627 A CN201210058627 A CN 201210058627A CN 102622586 A CN102622586 A CN 102622586A
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Abstract
The invention discloses an iris-acquisition optical system for assisting focusing by utilizing visible light. The iris-acquisition optical system comprises a focus measuring lens, an iris-image acquisition lens, a spectroscope, a varifocal lens and an expansion lens. The iris-acquisition optical system is characterized in that the focus measuring lens comprises a positioning function unit and a focusing function unit and comprises an iris pickup shutter control machine; light is split into visible light and infrared light by the spectroscope after passing through the varifocal lens and the expansion lens, the visible light enters the focus measuring lens for imaging and the infrared light enters the iris-image acquisition lens for imaging. The system provided by the invention can acquire an iris image of a human body covertly, is especially designed for the condition without active cooperation of staffs, and can be used for acquiring irises of the staffs at different distances, and reducing the invasion to the acquired staffs.
Description
Technical field
The present invention relates to the iris capturing field, be specially a kind of iris capturing optical system of utilizing the auxiliary focusing of visible light.
Background technology
The iris image of human body can be used for authentication and personnel tracking, but current iris authentication system is because the Iris Location scarce capacity requires the user of service to cooperate recognition system to carry out the collection of iris image, and this has just brought some property invaded.And in some applications, requirement can be discerned authentication to personnel on remote, even requires to carry out not causing under the situation that tested personnel note.So just require system can be adapted to the target person of standing and walking; And be through its iris being carried out to picture identification to the mode that personnel carry out authentication, thereby be badly in need of a kind of can be on the different acquisition distance high-quality iris image gathering system of focusing automatically.And being in some specific purposes, it is particularly important that non-helpmate's iris image acquiring seems.
Summary of the invention
The technical matters that the present invention solved is to provide a kind of iris capturing optical system of utilizing the auxiliary focusing of visible light, to solve the shortcoming in the above-mentioned background technology.
The technical matters that the present invention solved adopts following technical scheme to realize:
A kind of iris capturing optical system of utilizing the auxiliary focusing of visible light; Comprise that one is surveyed zoom lens, iris image acquiring camera lens, spectroscope, zoom lens and an expansion lens; Said survey zoom lens comprises positioning function unit and focus function unit, and said survey zoom lens comprises iris camera shutter controller; Light through zoom lens and expansion lens after spectroscope is divided into visible light and infrared light, survey zoom lens shown in visible light gets into and be carried out to picture, infrared light gets into said iris image acquiring camera lens and is carried out to picture; Aim at a human face region in case survey zoom lens; Survey zoom lens and promptly begin in image, to seek a target that is used to focus; At first by said positioning function unit with target localization, said then focus function unit reaches meticulous focusing through the adjusting to said zoom lens, after aiming at; Said focus function unit sends the focus signal to said iris camera shutter controller, and the iris image acquiring camera lens starts and the collection iris image.Also be provided with lens between said spectroscope and the survey zoom lens.Said zoom lens and expansion lens quantity can be selected according to enlargement factor.
Beneficial effect
The present invention proposes a kind of system that can hidden collection body iris image, has carried out system design to the situation that does not have personnel to cooperate with on one's own initiative especially, can be used on the different distance personnel's iris and gathers, and has reduced by the personnel's of collection infringement.
Figure of description
Fig. 1 is a kind of structured flowchart that utilizes the iris capturing optical system of the auxiliary focusing of visible light.
How Fig. 2 supports the function declaration figure of iris capturing camera for a kind of special original paper that utilizes visible light to assist the iris capturing optical system of focusing.
Fig. 3 is the exemplary plot of target monitoring area.
Fig. 4 is a kind of utilize the numeral inclination of the auxiliary iris capturing optical system of focusing of visible light and application of rotary system.
Fig. 5 is a kind of process flow diagram that utilizes a kind of implementation method of the auxiliary iris capturing optical system of focusing of visible light.
Fig. 6 is a kind of process flow diagram that utilizes the another kind of implementation method of the auxiliary iris capturing optical system of focusing of visible light.
Fig. 7 is a kind of process flow diagram that utilizes another implementation method of the auxiliary iris capturing optical system of focusing of visible light.
Embodiment
For example the present invention is set forth in detail below.
Referring to Fig. 1 and Fig. 2; A kind of structured flowchart of the auxiliary iris capturing optical system of focusing of visible light and key diagram how its special original paper supports the iris capturing camera of utilizing; A kind of iris capturing optical system of utilizing the auxiliary focusing of visible light; Comprise that one is surveyed zoom lens 12, iris image acquiring camera lens 14, spectroscope 22, zoom lens 18 and an expansion lens 20; Said survey zoom lens 12 comprises positioning function unit 28 and focus function unit 30, and said survey zoom lens 12 comprises iris camera shutter controller 34; Light through zoom lens 18 and expansion lens 20 after spectroscope 22 is divided into visible light and infrared light, survey zoom lens 12 shown in visible light gets into and be carried out to picture, infrared light gets into said iris image acquiring camera lens 14 and is carried out to picture; Aim at a human face region in case survey zoom lens 12; Survey zoom lens 12 and promptly begin in image, to seek a target that is used to focus; At first by said positioning function unit 28 with target localization, said then focus function unit 30 reaches meticulous focusing through the adjusting to said zoom lens 18, after aiming at; Said focus function unit 30 sends focus signal 32 to said iris camera shutter controller 34, and iris image acquiring camera lens 14 starts and the collection iris image.Also be provided with lens 16 between said spectroscope 22 and the survey zoom lens 12.Said zoom lens 18 can be selected according to enlargement factor with expansion lens 20 quantity.
A kind of iris capturing optical system of utilizing visible light to assist and focus is a camera chain 10; Camera chain 10 comprises that one is surveyed zoom lens 12 and an iris image acquiring camera lens 14; In some instances; The resolution of surveying zoom lens 12 can be lower than the resolution of iris image acquiring camera lens 14, but we do not make any definitive requirement to this.Lens 16 can provide the information of visual field much at one with iris image acquiring camera lens 14 for surveying zoom lens 12.In some cases, lens 16 are not necessary, and this depends on surveys particular arrangement and concrete structure between zoom lens 12 and the iris image acquiring camera lens 14.In the other instance, surveying zoom lens 12 also can be camera responsive to any specific band of light and that have high frame frequency and have the burnt function of survey.Iris image acquiring camera lens 14 also can be that to specify the camera that can gather the high-quality picture in the spectral range, special spectrum arbitrarily can be visible light or infrared band in addition, not restriction.Picture quality then depends on concrete application and decides, then need high-quality image such as the application of high safety grade.
Surveying zoom lens 12 main functions is to collect the image that gets into camera through light path 24 and lens 16 backs; And through the Digital Image Processing algorithm; Obtain describing in the sharpness that changes a series of images that obtains behind the focal length of zoom lens 18; When obtaining picture rich in detail, send zoom lens 18 focal lengths registration signal 32, think that the focal length of this moment is optimum focal length.Surveying the burnt signal of survey that zoom lens 12 provides is mainly used in the focal length that changes in the zoom lens 18 certain or a plurality of lens and is used for focusing on.Share light path because survey zoom lens 12 with iris image acquiring camera lens 14; Can see identical image, thereby can think and under the ambient lighting condition, zoom lens 18 focused and to make iris image acquiring camera lens 14 focused on equally preferably through surveying zoom lens 12.In some applications, survey zoom lens 12 and can move the camera lens in the varifocal mirror 18 through suitable automatic one or more servo motor of focus algorithm adjustment.
Because the light of different wavelengths refractive index through medium (lens as indicated) time is different, so the focal length that the zoom lens 18 that survey zoom lens 12 is measured are confirmed maybe be also different with the focal length of the iris image acquiring camera lens 14 that adopts other wave band imaging.But the focal length confirmed of zoom lens 18 is still useful, and we only need to adopt a fixed correction coefficient relevant with wavelength utilizing survey zoom lens 12 obtain utilizing correction coefficient to obtain iris image acquiring camera lens 14 due focal lengths rapidly behind the focal length of zoom lens 18.
Fig. 2 has shown function and the interaction between camera chain 10 each assemblies.Survey zoom lens 12 and have multiple function, comprise and seek target and the focusing automatically that is used to focus.Aim at a human face region in case survey zoom lens 12, survey zoom lens 12 and promptly begin in image, to seek a target that is used to focus.Many times, being used to focus is predefined target, such as people's the eyes position or the spine position of nose.At first by positioning function unit 28 with target localization, survey burnt camera 12 and promptly carry out meticulous focusing through focus function unit 30.Might work in different wavelengths because survey zoom lens 12 respectively with iris image acquiring camera lens 14, so be necessary a fixed correction to be provided to the focal length between iris image acquiring camera lens 14 and the survey zoom lens 12.Like this, in the time of target travel, focus such as walking, bend over, survey rotary head the time adjustment zoom lens 18 that zoom lens 12 can not stop.After aiming at, camera chain 10 can provide a focal length registration signal 32 be used to gather iris image 15 to iris camera shutter controller 34.
In some cases, camera chain 10 requires to be used to the personnel that detect and be identified in the ad-hoc location walking and stand, such as in public arenas such as airports.Referring to Fig. 3; The exemplary plot of target monitoring area; In this drawing, have the people 36 to move to a left side down from upper right along the path, camera chain 10 is that lock onto target is until target moves to a little 40 position at point 38 places; In this time period, camera chain 10 can be gathered the iris image of sufficient amount and is used for pedestrian's identification.A lot of hypothesis in this key diagram, have been done; Such as the visual angle is positive and negative 22.5 °, and just total visual angle is 45 °, though the pedestrian does not recognize own being identified; Work that also can coupled system; But require the pedestrian to face cam movement basically, can obtain the picture of the positive motion of pedestrian like this, this system can work in the scope of 2-5 rice.
Referring to Fig. 4, a kind of numeral of utilizing the iris capturing optical system of the auxiliary focusing of visible light tilts and the application of rotary system, and it has defined an iris image acquiring camera lens 14 with PT (rotation and tilt) function, and it has ten million pixel scale.On a particular distance, iris image acquiring camera lens 14 has a visual field that utilizes frame 42 expressions, and it can mate with pedestrian's size 44.46 of a littler frame has shown the visual field of pedestrian's iris.Only if pedestrian's motion is exceedingly fast, otherwise the camera with PT function need not to adjust the mechanical rotation part, only can realize digital PT through the tracking frame 46 in the frame 42.Through tracing process to people's face in the image, very important person's face whole or big portion in image, just can be under the prerequisite of mechanically moving PT equipment not realization to the tracking collection of iris image.With iris image acquiring camera lens 14 approximately uniform visual field is arranged because survey zoom lens 12; Thereby rotation and angle of inclination (PT parameter) are approximately uniform; Focusing algorithm at first finds in the focusing video camera scope and focuses target; Such as the pupil of eyes or the spine of nose, and then accurately it is focused.
Referring to Fig. 5, a kind of process flow diagram of a kind of implementation method of the iris capturing optical system of utilizing the auxiliary focusing of visible light, it is one and utilizes the process flow diagram that camera chain 10 can realization example, but the function of camera chain 10 is not limited in this.Zoom lens 18 focus on surround lighting or some other appointment spectrum.In some example, zoom lens 18 are through surveying the automatic focus that zoom lens 12 can iteration, and iris image utilizes the near infrared lamp to carry out the illumination for exposure iris region through the time exposure collection of iris image acquiring camera lens 14 usually then.
Referring to Fig. 6, a kind of process flow diagram that utilizes the another kind of implementation method of the auxiliary iris capturing optical system of focusing of visible light, but the function of camera chain 10 is not limited in this.In processing module 47, one is used to survey burnt target and is placed in the visual field of surveying zoom lens 12, and in processing module 48, camera lens has been accomplished focusing.Accomplishing automatically defocused, the parameter of controlling focal length is passed to processing module 52 through iteration.In most cases, be to utilize visible images to focus, and utilize the illumination of near infrared lamp to carry out iris capturing, thereby need correct the different focal of different wave length light.In processing module 50, iris image is gathered then.
Referring to Fig. 7, a kind of process flow diagram of another implementation method of the iris capturing optical system of utilizing the auxiliary focusing of visible light,, it is one and utilizes the process flow diagram that camera chain 10 can realization example, but the function of camera chain 10 is not limited in this.In processing module 54, the light that gets into camera chain 10 is divided into surround lighting (visible light part) and infrared illumination part by spectroscope, and the visible light part is assigned to surveys zoom lens 12, and the near infrared light part is then assigned to iris image acquiring camera lens 14.In processing module 58, be used to survey burnt target and found out, a target that survey simultaneously is burnt and a part on every side thereof are split in processing module 60 to be used for focusing to surveying zoom lens 12 accurately.Carry out the rectification of focal length between the different wavelengths of light if desired, controlled variable is delivered to 62, and after focal length was by correct the setting, iris image carried out IMAQ under the exposure of infrared lamp is auxiliary.
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention; The technician of the industry should understand; The present invention is not restricted to the described embodiments; That describes in the foregoing description and the instructions just explains principle of the present invention, and under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various changes and modifications; These variations and improvement all fall in the scope of the invention that requires protection, and the present invention requires protection domain to be defined by appending claims and equivalent thereof.
Claims (3)
1. one kind is utilized the auxiliary iris capturing optical system of focusing of visible light; Comprise that one is surveyed zoom lens, iris image acquiring camera lens, spectroscope, zoom lens and an expansion lens; It is characterized in that; Said survey zoom lens comprises positioning function unit and focus function unit, and said survey zoom lens comprises iris camera shutter controller; Light through zoom lens and expansion lens after spectroscope is divided into visible light and infrared light, survey zoom lens shown in visible light gets into and be carried out to picture, infrared light gets into said iris image acquiring camera lens and is carried out to picture; Aim at a human face region in case survey zoom lens; Survey zoom lens and promptly begin in image, to seek a target that is used to focus; At first by said positioning function unit with target localization, said then focus function unit reaches meticulous focusing through the adjusting to said zoom lens, after aiming at; Said focus function unit sends the focus signal to said iris camera shutter controller, and the iris image acquiring camera lens starts and the collection iris image.
2. a kind of iris capturing optical system of utilizing the auxiliary focusing of visible light according to claim 1 is characterized in that, also is provided with lens between said spectroscope and the survey zoom lens.
3. a kind of iris capturing optical system of utilizing the auxiliary focusing of visible light according to claim 1 is characterized in that said zoom lens and expansion lens quantity can be selected according to enlargement factor.
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| CN103245613A (en) * | 2013-04-17 | 2013-08-14 | 中国科学院上海微系统与信息技术研究所 | Focalizing system and method of divergent terahertz light source optic light path |
| CN104257341A (en) * | 2014-09-24 | 2015-01-07 | 苏州六阳光电科技有限公司 | Endoscope optical system used for infrared and visible monitoring simultaneously |
| CN107077615A (en) * | 2017-01-12 | 2017-08-18 | 厦门中控生物识别信息技术有限公司 | Fingerprint method for anti-counterfeit and equipment |
| CN107179592A (en) * | 2017-06-30 | 2017-09-19 | 广东欧珀移动通信有限公司 | Camera lens module, camera module and electronic installation |
| CN108830216A (en) * | 2018-06-11 | 2018-11-16 | 北京理工大学 | A kind of adjustable continuous vari-focus target identification system of visual field and method |
| CN110062168A (en) * | 2019-05-05 | 2019-07-26 | 北京七鑫易维信息技术有限公司 | Shooting parameter adjustment method, device, equipment and the medium of eye movement tracing equipment |
| CN110135367A (en) * | 2013-10-21 | 2019-08-16 | 王晓鹏 | A kind of method and apparatus of biological characteristic imaging |
| CN107679481B (en) * | 2017-09-27 | 2021-09-14 | Oppo广东移动通信有限公司 | Unlocking control method and related product |
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Cited By (11)
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| CN103245613A (en) * | 2013-04-17 | 2013-08-14 | 中国科学院上海微系统与信息技术研究所 | Focalizing system and method of divergent terahertz light source optic light path |
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| CN110135367A (en) * | 2013-10-21 | 2019-08-16 | 王晓鹏 | A kind of method and apparatus of biological characteristic imaging |
| CN104257341A (en) * | 2014-09-24 | 2015-01-07 | 苏州六阳光电科技有限公司 | Endoscope optical system used for infrared and visible monitoring simultaneously |
| CN104257341B (en) * | 2014-09-24 | 2017-07-25 | 苏州六阳光电科技有限公司 | It is a kind of to be used for the endoscope optical system of infrared and visible monitoring simultaneously |
| CN107077615A (en) * | 2017-01-12 | 2017-08-18 | 厦门中控生物识别信息技术有限公司 | Fingerprint method for anti-counterfeit and equipment |
| CN107179592A (en) * | 2017-06-30 | 2017-09-19 | 广东欧珀移动通信有限公司 | Camera lens module, camera module and electronic installation |
| CN107679481B (en) * | 2017-09-27 | 2021-09-14 | Oppo广东移动通信有限公司 | Unlocking control method and related product |
| CN108830216A (en) * | 2018-06-11 | 2018-11-16 | 北京理工大学 | A kind of adjustable continuous vari-focus target identification system of visual field and method |
| CN108830216B (en) * | 2018-06-11 | 2021-11-16 | 北京理工大学 | Continuous zooming target identification system and method with adjustable view field |
| CN110062168A (en) * | 2019-05-05 | 2019-07-26 | 北京七鑫易维信息技术有限公司 | Shooting parameter adjustment method, device, equipment and the medium of eye movement tracing equipment |
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Application publication date: 20120801 |