CN101221343A - Active illumination imaging device against surroundings light interference - Google Patents
Active illumination imaging device against surroundings light interference Download PDFInfo
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- CN101221343A CN101221343A CNA2008100544537A CN200810054453A CN101221343A CN 101221343 A CN101221343 A CN 101221343A CN A2008100544537 A CNA2008100544537 A CN A2008100544537A CN 200810054453 A CN200810054453 A CN 200810054453A CN 101221343 A CN101221343 A CN 101221343A
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Abstract
The invention provides an anti-environmental interference active image device, relating to the biometric identification, security detection, and photographic device technical field. The invention is mainly provided with an array image detector and an active lighting structure, wherein the active lighting structure is provided with a light beam scattering plate in front of a light source; an optic filter is arranged in front of the array image detector. The invention is characterized in overcoming the drawbacks of the prior art, using a special light source for active illumination to prevent or keep environmental light such as light of fluorescent lamp, incandescent lamp, and sun form entering the image detector, to reduce bad influence of the environmental light especially environmental light at different time on the images and to obtain images which have the advantages of high fidelity to noise ratio, good consistency, high uniformity, definition and comparison, etc., and effectively improving the accuracy of image identification and rate of identification. The invention is applicable in the field of biometric identification such as face identification, fingerprint identification, etc.
Description
Technical field
The present invention relates to bio-identification, security monitoring and photographic equipment technical field, specifically is a kind of anti-interference imaging device of active illumination.
Background technology
Fingerprint recognition, recognition of face, iris recognition technology have begun to be widely used in that gate inhibition, work attendance, bank cashier, locker, safety cabinet (chest), POS machine, computer log authentication, passport check are boarded, bank's prison drover's car, student status management, poll etc.These biological identification technologies are compared with template in the database and are judged the identity of identifying object by gathering the image of fingerprint, people's face and iris, and it refuses Key Performance Indicator sincere, that accuracy of system identification is system.
The image of the identifying object that biological recognition system is gathered has high signal to noise ratio (S/N ratio) and data consistency is to realize the prerequisite of good bio-identification performance.Wherein, signal to noise ratio (S/N ratio) reflection is the ratio of signal and surround lighting disturbance in the image, circuit dark current; And data consistency be meant difference constantly, under the different surround lighting, the identifying object view data difference of being gathered is little.
Good signal noise ratio (snr) of image is only arranged, and to refuse key index such as sincere, accuracy of system identification be very limited for improving biological recognition system.Biological recognition system, the recognition system of particularly noncontact images acquired (as face identification system), very responsive to the image consistance of identifying object.Because actual environment for use more complicated, being operated in different period daylight illumination and lighting all can great changes will take place, although visually do not observe notable difference, the view data of being gathered has produced very big-difference.For example, daylight oblique fire in morning enter and because of daylight dimness opened 1 of daylight lamp, register identifying object this moment and had higher identification accuracy at that time, but in another moment (as noon), day angle of light reduces to make scene illumination increase and because the bright daylight lamp of having closed illumination of light, although the imperceptible notable difference of human eye vision at this moment, but the data difference that the view data of the same identifying object that biological recognition system collects and morning gather is very serious, and the identifying object of original registration may can not discern or recognition accuracy reduces greatly.In order to make the identifying object image not be subjected to ambient light effects, improve the view data consistance, part biological identification enterprise has taked the method for visible illumination, also there is enterprise to adopt initiatively means of illumination of infrared light, suppress or end illuminating bundle surround lighting in addition with optical filter, the active illumination light that relies on recognition system itself to provide illuminates identifying object, compare the visible illumination method, the infrared illumination method is strong with disguise, stimulate little advantage to become main developing direction to the identifying object vision system.But general at present use 850nm diode lights is as the active lighting source, and its spectrum broad has big overlapping region with daylight lamp, incandescent lamp and sunlight, adds that the optical filter transmittance curve can not be very precipitous.Thereby surround lighting still has bigger energy to enter image detector, and conforming improvement is limited to this technical scheme to view data.
In addition, although environment daylight and houselights cause the view data of identifying object to change, but it is very even through the structure that body of wall repeatedly reflects formed illuminating bundle, and disturb the method for the illumination of taking the initiative in order to improve view data consistance, filtering environmental light, because recognition system mechanical dimensions restriction and can not be arranged in the active illuminating lamp very in the extensive area for the consideration of aesthetics, formed illuminating bundle is structural and directivity is very strong.Through verification experimental verification, have only identifying object is limited in and could realize on distance to a declared goal and the orientation discerning preferably.Too closely then light is too strong apart from main frame for identifying object, too far then light too a little less than, and move left and right also can cause alter a great deal identification difficulty of view data.
In sum, because the image of biological recognition system collection is changed by the ambient light interference data, and initiatively illuminating bundle is very inhomogeneous, and this contradiction is not well overcome at present, has limited its recognition performance and widespread use greatly.Contactless identification technology particularly, as recognition of face because this key index of identification accuracy is undesirable, unstable, people's face of registration in morning to noon just be not familiar with or the probability of admitting one's mistake very high, applying of this technology is subjected to very big restriction.
Summary of the invention
The active illumination imaging device that the purpose of this invention is to provide a kind of anti-ambient light interference, be characterized in: utilize special light source to carry out active illumination and use beam divergence plate, to improve signal noise ratio (snr) of image and homogeneity, make the image that is obtained have signal to noise ratio (S/N ratio) height, high conformity, homogeneity height, sharpness height, contrast advantages of higher, thereby can effectively improve image recognition accuracy and discrimination.Can be widely used in field of biological recognition such as recognition of face, fingerprint recognition.
Main technical schemes of the present invention is: a kind of active illumination imaging device of anti-ambient light interference, comprise the array image-forming detector, it is characterized in that being provided with initiatively light structures, the light source front of this active light structures is provided with the beam divergence plate, and the front of above-mentioned array image-forming detector is provided with optical filter.
Described beam divergence plate is holographic scatter plate or outside surface or the inner transparent substance that is provided with diffuse reflective structure.
Described outside surface or the inner transparent substance that is provided with diffuse reflective structure are single or double frosted glass, or single or double hair organic glass, or single or double hair transparent plastic etc.
The optical filter that described energy sees through laser is contained in before the photosurface of camera lens of array image-forming detector and the back of camera lens is good, also can be contained in the front of this camera lens.
The light source of described active light structures can be 850 nanometer infrarede emitting diodes.
The light source of described active light structures also can be 940 nanometer infrarede emitting diodes.
The light source of described active light structures also can be laser instrument.
Described array image-forming detector formula is CCD or cmos detector etc.
Identification module, monitor or computing machine are connected to good the signal output part of described array image-forming detector mutually with face.
Its ultimate principle is: utilize special light source to carry out active illumination and use beam divergence plate etc., to suppress or to have entered image detector, reduced the adverse effect of the surround lighting of especially different periods of surround lighting to image by surround lighting such as daylight lamp, incandescent lamp and sunlight etc.; The light beam that special light source sends is through beam divergence plate scattering back lighting target, the target reflection light beam contains surround lighting and active illumination light, the filtering of process optical filter only keeps initiatively illumination light to the environment spectral component of array imaging detector sensitivity, pass through the array image-forming detector again, with obtain the signal to noise ratio (S/N ratio) height, uniform target image throws light on.
The present invention has the beneficial effect that: it has overcome the deficiency of prior art, fine solved that prior art existed since the midium or long term and unsolved always signal to noise ratio (S/N ratio) low, the view data consistance is poor, the technical barrier that discrimination is low, it utilizes special light source to carry out active and throws light on and used the beam divergence plate, can suppress or end surround lighting such as daylight lamp, incandescent lamp and sunlight etc. enter image detector, reduced the adverse effect of the surround lighting of especially different periods of surround lighting to image, make the image that is obtained have the signal to noise ratio (S/N ratio) height, high conformity, the homogeneity height, the sharpness height, the contrast advantages of higher, thereby can effectively improve image recognition accuracy and discrimination, technical have a uniqueness.Can be widely used in field of biological recognition such as recognition of face, fingerprint recognition.
Be described further below in conjunction with embodiment, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention 1.
Fig. 2 is the structural representation of the embodiment of the invention 2.
Among Fig. 1, Fig. 2,1 is the beam divergence plate, 2 is initiatively light structures of (two light source) 940 (or 850) nanometer infrarede emitting diode, 3 is (can see through centre wavelength 940 (or 850) nanometer infrared light) optical filter, 4 is the array image-forming detector, 41 is (array image-forming detector 4) camera lens, and 5 is initiatively light structures of laser instrument, and 6 is (can see through laser) optical filter.
Embodiment
Referring to Fig. 1, the active illumination imaging device of this anti-ambient light interference, comprise array image-forming detector 4, and be provided with centre wavelength 940 (or 850) nanometer (as being that 940nm ± 10nm or power spectrum centre wavelength are initiatively light structures 2 of the infrarede emitting diode (lamp) of 850nm ± 10nm) with power spectrum centre wavelength, this centre wavelength 940 (or 850) the nanometer infrarede emitting diode initiatively light source front of light structures 2 is provided with beam divergence plate 1, laser light source is established 1 or 2, or several (among the figure being 2), make one with array image-forming detector 4; The front of above-mentioned array image-forming detector 4 is provided with the optical filter 3 that can see through centre wavelength 940 (or 850) nanometer infrared light, and the optical filter 3 that can see through centre wavelength 940 (or 850) nanometer infrared light is contained in the back of the camera lens of array image-forming detector 4.Beam divergence plate 1 is holographic scatter plate or outside surface or the inner transparent transparent substance that is provided with diffuse reflective structure.Outside surface or the inner transparent substance that is provided with diffuse reflective structure are frosted glass.Described array image-forming detector 4 is CCD or cmos detector.The signal output part of array image-forming detector 4 can with face identification module, monitor and computing machine link to each other (figure part omitted) mutually.
Referring to Fig. 2, the active illumination imaging device of this anti-ambient light interference, comprise array image-forming detector 4, laser instrument is light structures 5 initiatively, this laser instrument initiatively light source front of light structures 5 is provided with beam divergence plate 1, laser instrument can be established 1 or 2, or several (among the figure being 1), makes one with array image-forming detector 4; The front of array image-forming detector 4 is provided with the optical filter 6 that can see through laser, and this optical filter 6 that can see through laser is contained in the back of the camera lens of array image-forming detector 4.Above-mentioned beam divergence plate 1 is holographic scatter plate or outside surface or the inner transparent transparent substance that is provided with diffuse reflective structure.Described outside surface or the inner transparent substance that is provided with diffuse reflective structure are single face frosted glass.Above-mentioned array image-forming detector 4 is CCD or cmos detector.The signal output part of array image-forming detector 4 can with face identification module, monitor and computing machine link to each other (figure part omitted) mutually.
Claims (9)
1. the active illumination imaging device of an anti-ambient light interference, comprise array image-forming detector (4), it is characterized in that being provided with initiatively light structures (2,5), the light source front of this active light structures (2,5) is provided with beam divergence plate (1), and the front of above-mentioned array image-forming detector (4) is provided with optical filter (3,6).
2. the active illumination imaging device of anti-ambient light interference according to claim 1 is characterized in that described beam divergence plate (1) is holographic scatter plate or outside surface or the inner transparent substance that is provided with diffuse reflective structure.
3. the active illumination imaging device of anti-ambient light interference according to claim 2 is characterized in that described outside surface or the inner transparent substance that is provided with diffuse reflective structure are the transparent plastic of single or double frosted glass, hair organic glass or hacking.
4. the active illumination imaging device of anti-ambient light interference according to claim 1 is characterized in that described optical filter (3,6) is contained in the preceding back or the front that reaches camera lens of photosurface of array image-forming detector (4).
5. the active illumination imaging device of anti-ambient light interference according to claim 1, the light source that it is characterized in that described active light structures (2) are silver pink UV light-emitting diodes in the centre wavelength 850.
6. the active illumination imaging device of anti-ambient light interference according to claim 1, the light source that it is characterized in that described active light structures (2) are silver pink UV light-emitting diodes in the centre wavelength 940.
7. the active illumination imaging device of anti-ambient light interference according to claim 1, the light source that it is characterized in that described active light structures (5) is a laser instrument.
8. the active illumination imaging device of anti-ambient light interference according to claim 1 is characterized in that described array image-forming detector (4) is CCD or cmos detector.
9. according to the active illumination imaging device of claim 1,2,3,4,5,6,7 or 8 described anti-ambient light interference, identification module, face phase recognition system, monitor or computing machine link to each other mutually with face to it is characterized in that the signal output part of described array image-forming detector (4).
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| CNA2008100544537A CN101221343A (en) | 2008-01-18 | 2008-01-18 | Active illumination imaging device against surroundings light interference |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101846864A (en) * | 2010-04-13 | 2010-09-29 | 世大光电(深圳)有限公司 | Object tracking optical system and method |
| CN105118237A (en) * | 2015-09-16 | 2015-12-02 | 苏州清研微视电子科技有限公司 | Intelligent lighting system for fatigue driving early-warning system |
| CN105867050A (en) * | 2016-06-06 | 2016-08-17 | 深圳市激埃特光电有限公司 | Edge rainbow feathering device for photography |
| CN110386401A (en) * | 2019-07-01 | 2019-10-29 | 广州大学 | A kind of contrast intensifying device applied on a moving belt |
| CN110438746A (en) * | 2019-05-10 | 2019-11-12 | 青岛海尔智能技术研发有限公司 | Material Identification device, method, washing machine and its control method |
| CN113487757A (en) * | 2021-05-21 | 2021-10-08 | 范慢慢 | Smart classroom equipment based on cloud computing |
-
2008
- 2008-01-18 CN CNA2008100544537A patent/CN101221343A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101846864A (en) * | 2010-04-13 | 2010-09-29 | 世大光电(深圳)有限公司 | Object tracking optical system and method |
| CN101846864B (en) * | 2010-04-13 | 2011-05-11 | 世大光电(深圳)有限公司 | Object tracking optical system and method |
| CN105118237A (en) * | 2015-09-16 | 2015-12-02 | 苏州清研微视电子科技有限公司 | Intelligent lighting system for fatigue driving early-warning system |
| CN105118237B (en) * | 2015-09-16 | 2018-01-19 | 苏州清研微视电子科技有限公司 | Intelligent illuminating system for driver fatigue monitor system |
| CN105867050A (en) * | 2016-06-06 | 2016-08-17 | 深圳市激埃特光电有限公司 | Edge rainbow feathering device for photography |
| CN110438746A (en) * | 2019-05-10 | 2019-11-12 | 青岛海尔智能技术研发有限公司 | Material Identification device, method, washing machine and its control method |
| CN110438746B (en) * | 2019-05-10 | 2021-06-22 | 青岛海尔智能技术研发有限公司 | Material identification device and method, washing machine and control method thereof |
| CN110386401A (en) * | 2019-07-01 | 2019-10-29 | 广州大学 | A kind of contrast intensifying device applied on a moving belt |
| CN113487757A (en) * | 2021-05-21 | 2021-10-08 | 范慢慢 | Smart classroom equipment based on cloud computing |
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Effective date of registration: 20090116 Address after: Shijiazhuang City, Xinhua Road Province, Hebei City Mingyuan No. 159 room A-6C post encoding: 050004 Applicant after: Wang Jinyu Address before: Photoelectric technology research institute, No. 97 Heping West Road, Hebei, Shijiazhuang, China: 050003 Applicant before: Wang Jinzhi |
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