CN201159819Y - Anti-interference imaging device with laser active illumination - Google Patents
Anti-interference imaging device with laser active illumination Download PDFInfo
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- CN201159819Y CN201159819Y CNU200820076138XU CN200820076138U CN201159819Y CN 201159819 Y CN201159819 Y CN 201159819Y CN U200820076138X U CNU200820076138X U CN U200820076138XU CN 200820076138 U CN200820076138 U CN 200820076138U CN 201159819 Y CN201159819 Y CN 201159819Y
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- 238000005286 illumination Methods 0.000 title claims abstract description 43
- 238000003384 imaging method Methods 0.000 title claims abstract description 22
- 230000003287 optical effect Effects 0.000 claims abstract description 15
- 239000000126 substance Substances 0.000 claims description 6
- 239000005338 frosted glass Substances 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 4
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- 230000002411 adverse Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000001795 light effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
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Abstract
The utility model provides an anti-interference imaging device with a laser active illumination, which relates to the technology fields of biometric recognition, security monitor and photography equipment. The device is mainly provided with an array imaging detector and a laser source imaging active illuminating structure; an optical filter which can make the laser to pass through is arranged in front of the array imaging detector. The utility model is characterized in that the device overcomes the disadvantages in the prior art. Using the laser to performance the active illumination and using the optical filter that can make the laser to pass through effectively block the environment light such as the fluorescent lamp light, the incandescent lamp light and the sun light to enter into the imaging detector and greatly reduce the bad influence to the image by the environment light, especially the environment light at different time period; the obtained image has the advantages of high signal to noise ratio, good consistency, and high uniformity, definition and contrast; thereby the recognition accuracy and recognition ratio of the image is effectively increased. The utility model is unique in technology and can be widely used in the biometric recognition field such as face recognition and fingerprint recognition.
Description
Technical field
The utility model relates to bio-identification, security monitoring and photographic equipment technical field, specifically is a kind of anti-interference imaging device of laser 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, this The Application of Technology is expanded and is subjected to very big restriction.
Summary of the invention
The purpose of this utility model provides a kind of anti-interference imaging device of laser active illumination, be characterized in: utilize laser to carry out the active illumination, can significantly reduce the adverse effect of the surround lighting of especially different periods of surround lighting to image, 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, 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 utility model is: a kind of anti-interference imaging device of laser active illumination, comprise the array image-forming detector, it is characterized in that being provided with the laser active illumination structure, the front of above-mentioned array image-forming detector is provided with the optical filter of energy transmission illumination laser.
The optical filter that described energy sees through laser is contained in before the photosurface of array image-forming detector and the back of camera lens is good, also can be contained in the front of this camera lens.
Can be provided with one or more laser instruments in the described laser active illumination structure.
Described laser instrument is that semiconductor laser is good.
It is good that the light source front of described laser active illumination structure is provided with the beam divergence plate.
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 the transparent plastic of single or double frosted glass, hair organic glass or hacking etc.
The optical filter that described energy sees through laser is that spike interference filter is good.
Described array image-forming detector is CCD or cmos detector etc.
Identification module, face phase recognition system, 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 laser to carry out the active illumination, can enter image detector by surround lighting such as daylight lamp, incandescent lamp and sunlight etc. effectively, significantly reduced the adverse effect of the surround lighting of especially different periods of surround lighting to image; The light beam that LASER Light Source is sent 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 laser illuminator to the environment spectral component of array imaging detector sensitivity, pass through the array image-forming detector again, thereby obtain the signal to noise ratio (S/N ratio) height, uniform target image throws light on.
The beneficial effects of the utility model are: the deficiency that has overcome prior art preferably, 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, with utilize infrared light to carry out active illumination to compare, utilize laser to carry out the active illumination, the optical filter of transmission laser can more effectively end surround lighting such as daylight lamp, incandescent lamp and sunlight etc. have entered image detector, significantly 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 to qualification of the present utility model.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Among Fig. 1,1 is the beam divergence plate, and 2 is the laser active illumination structure, and 3 is (can see through laser) optical filter, and 4 is the array image-forming detector, and 41 is (array image-forming detector 4) camera lens.
Embodiment
Referring to Fig. 1, the anti-interference imaging device of this laser active illumination comprises array image-forming detector 4, it is characterized in that being provided with laser active illumination structure 2, can be provided with one or more laser instruments in the laser active illumination structure, and laser instrument is a semiconductor laser.The light source front of this laser active illumination structure 2 is provided with beam divergence plate 1, and light source can be established 1 or 2, or several (among the figure being 1) laser instrument, and best and array image-forming detector 4 is made one; The front of above-mentioned array image-forming detector 4 is provided with the optical filter 3 that can see through laser, and as with spike interference filter etc., this optical filter 3 that can see through laser be contained in before the photosurface of array image-forming detector 4 and the back of camera lens.Above-mentioned beam divergence plate 1 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 can be single or double frosted glass.Above-mentioned array image-forming detector 4 is CCD or cmos detector.The signal output part of described array image-forming detector 4 can with face identification module, face phase recognition system, monitor link to each other with computing machine (figure part omitted) mutually.
Claims (10)
1, a kind of anti-interference imaging device of laser active illumination comprises array image-forming detector (4), it is characterized in that being provided with laser active illumination structure (2), and the front of above-mentioned array image-forming detector (4) is provided with the optical filter (3) that can see through laser.
2, the anti-interference imaging device of laser active illumination according to claim 1 is characterized in that described energy is contained in the preceding back or the front that reaches camera lens of photosurface of array image-forming detector (4) through the optical filter (3) of laser.
3, the anti-interference imaging device of laser active illumination according to claim 1 is characterized in that being provided with one or more laser instruments in the described laser active illumination structure (2).
4, the anti-interference imaging device of laser active illumination according to claim 3 is characterized in that described laser instrument is a semiconductor laser.
5, the anti-interference imaging device of laser active illumination according to claim 1 is characterized in that the light source front of described laser active illumination structure (2) is provided with beam divergence plate (1).
6, the anti-interference imaging device of laser active illumination according to claim 5 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.
7, the anti-interference imaging device of laser active illumination according to claim 6 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.
8, the anti-interference imaging device of laser active illumination according to claim 1 is characterized in that described energy is a spike interference filter through the optical filter (3) of laser.
9, the anti-interference imaging device of laser active illumination according to claim 1 is characterized in that described array image-forming detector (4) is CCD or cmos detector.
10, according to the anti-interference imaging device of claim 1,2,3,4,5,6,7,8,9 or 10 described laser active illumination, identification module, face phase recognition system, monitor or computing machine link to each other the signal output part that it is characterized in that described array image-forming detector (4) mutually with face.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU200820076138XU CN201159819Y (en) | 2008-01-22 | 2008-01-22 | Anti-interference imaging device with laser active illumination |
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| CNU200820076138XU CN201159819Y (en) | 2008-01-22 | 2008-01-22 | Anti-interference imaging device with laser active illumination |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053360A (en) * | 2010-10-18 | 2011-05-11 | 北京高普乐光电科技有限公司 | Initiative illuminating night vision device and method |
| CN103529622A (en) * | 2013-11-01 | 2014-01-22 | 四川中盾金卫光电科技有限公司 | Infrared camera |
| CN107634031A (en) * | 2017-08-14 | 2018-01-26 | 友达光电股份有限公司 | Manufacturing method of display panel |
| CN111226361A (en) * | 2017-10-23 | 2020-06-02 | 亮锐控股有限公司 | VCSEL-based biometric identification device |
-
2008
- 2008-01-22 CN CNU200820076138XU patent/CN201159819Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053360A (en) * | 2010-10-18 | 2011-05-11 | 北京高普乐光电科技有限公司 | Initiative illuminating night vision device and method |
| CN102053360B (en) * | 2010-10-18 | 2013-01-02 | 北京高普乐光电科技有限公司 | Initiative illuminating night vision device and method |
| CN103529622A (en) * | 2013-11-01 | 2014-01-22 | 四川中盾金卫光电科技有限公司 | Infrared camera |
| CN107634031A (en) * | 2017-08-14 | 2018-01-26 | 友达光电股份有限公司 | Manufacturing method of display panel |
| CN107634031B (en) * | 2017-08-14 | 2020-07-14 | 友达光电股份有限公司 | Manufacturing method of display panel |
| CN111226361A (en) * | 2017-10-23 | 2020-06-02 | 亮锐控股有限公司 | VCSEL-based biometric identification device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| C53 | Correction of patent of invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wang Jinyu Inventor before: Wang Jinzhi |
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| TR01 | Transfer of patent right |
Effective date of registration: 20090213 Address after: Shijiazhuang City, Xinhua Road Province, Hebei City No. 159 garden room A-6C, zip code: 050004 Patentee after: Wang Jinyu Address before: Photoelectric technology research institute, No. 97 Heping West Road, Hebei, Shijiazhuang 050003, China Patentee before: Wang Jinzhi |
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Owner name: WANG JINYU Free format text: FORMER OWNER: WANG JINZHI Effective date: 20090213 |
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Free format text: CORRECT: INVENTOR; FROM: WANG JINZHI TO: WANG JINYU |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081203 Termination date: 20100222 |