CN102436573A - Image acquisition and recognition device with active lighting function - Google Patents
Image acquisition and recognition device with active lighting function Download PDFInfo
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- CN102436573A CN102436573A CN2011101976243A CN201110197624A CN102436573A CN 102436573 A CN102436573 A CN 102436573A CN 2011101976243 A CN2011101976243 A CN 2011101976243A CN 201110197624 A CN201110197624 A CN 201110197624A CN 102436573 A CN102436573 A CN 102436573A
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Abstract
The invention relates to an image acquisition and recognition device with an active lighting function. An image acquisition and recognition assembly comprises a narrow-band low-pass light filter, an aspheric lens set camera assembly and an image sensor which are sequentially arranged on one light path. A lighting source assembly comprises a laser, a light spot shaping lens and a homogenizing micro lens which are sequentially arranged on the other light path. The laser is a 940nm infrared laser and realizes the active lighting of a rectangular large-area high-isolux surface through the light spot shaping lens and the homogenizing micro lens; by adopting the narrow-band low-pass light filter to intercept strong light beyond 940nm in ambient light, the performance of resisting ambient light interference is obviously enhanced; and through the consistent and good visual angle of an aspheric optical imaging lens set, the effect of distortionless, large-field-depth and high-definition images is realized, the finally obtained images have the advantages of large field depth, high signal-to-noise ratio, high definition, high contrast and no distortion, the recognition accuracy and speed of human face images are effectively improved, and the image acquisition and recognition device can be widely used in the fields of attendance check, door access control and safety protection and monitoring.
Description
Technical field
The present invention relates to information acquisition and identification, particularly relate to a kind of IMAQ and recognition device of active illumination.
Background technology
Refusing sincere and False Rate is the Key Performance Indicator of image identification system, and requiring has better image to offer system and extract useful, effective information.Because bio-identification initiatively illuminating bundle is very inhomogeneous, big limitations the image recognition performance, and normally used 850nm diode lights has tangible red point or red sudden and violent phenomenon as the active light source, the people has the psychology of conflict when identification.The chief ray of different visual fields is refused sincere and False Rate with the focus height of Gauss's image planes is not equal to that image deformation that ideal height causes also has a strong impact on recognition system after through optical system.In addition, the acquisition target position of the recognition system of noncontact images acquired is a random variation, or near from camera; Or it is far away when camera; And camera lens optimal imaging face has only one, does not all reach effect the most clearly away from the imaging of optimal imaging face, and leaves unintelligiblely more far more.
Summary of the invention
Technical matters to be solved by this invention is the defective that remedies above-mentioned prior art, and a kind of IMAQ and recognition device of active illumination is provided.
Technical matters of the present invention solves through following technical scheme.
The IMAQ and the recognition device of this active illumination; Comprise lighting source assembly and IMAQ recognizer component, said IMAQ recognizer component comprises narrow-band low pass optical filter, non-spherical lens set of shots assembly and the imageing sensor that is successively set on a light path.
The IMAQ of this active illumination and the characteristics of recognition device are:
Said lighting source assembly comprises laser instrument, spot shaping lens and the homogenize processing lenticule that is successively set on another light path.
Said laser instrument is under power drives, to produce the infrared laser of stimulated emission 940nm wave length laser beams as the active lighting source.
Technical matters of the present invention solves through following further technical scheme.
Said spot shaping lens are a kind of in rectangular lens, oval lenticule and the binary optical optical grating element; Be used for the light beam full circle and the homogenize of said laser instrument are treated to the rectangular large area uniform light spots that is fit to said imageing sensor extraction; Make range of exposures suitable, improve luminance effects.
It is holographic optical screen, single or double frosted glass, hair organic glass that lenticule is handled in said homogenize; And a kind of in the transparent plastic of low smooth finish, be used for the spread laser beam angle of divergence to setting value, increase illumination zone; Form area source, can illumination be unsaturated because laser light intensity is big.
Said narrow-band low pass optical filter is the infrared 940nm narrow-band low pass optical filter with film structure of optical thin film; Be used for filtering the whole light outside the surround lighting 940nm that comprises sunlight, daylight lamp and incandescent lamp; Effectively get into imageing sensor by it; With the performance of the anti-ambient light interference of remarkable enhancing, weaken the adverse effect of the surround lighting of especially different periods of surround lighting to image, the high bright uniform area light source that laser sends reflects through face; Light filters through the narrow-band low pass optical filter and obtains more real facial gray level image, and no matter all is the perfect figure picture of basically identical under the environment light condition of what period and different illumination.
Said non-spherical lens set of shots assembly be system stop between first lens and second lens and lens by just-negative-negative tactic three-chip type non-spherical lens set of shots assembly; Be used to shorten the total length of camera lens and guarantee image quality, realize the image effect of undistorted, the big depth of field, high-resolution at said imageing sensor.
Said imageing sensor is colored complementary metal oxide semiconductor (CMOS) (Complementary Metal Oxide Semiconductor; Initialism is CMOS) matrix opto-electronic conversion detector; Be used to form the big depth of field, high s/n ratio, high definition, high-contrast, distortionless image, with the recognition accuracy and the recognition speed of effective raising facial image.
Technical matters of the present invention solves through following further again technical scheme.
The setting value of the said angle of divergence equals or is slightly larger than field angle; Said laser beam is handled the active illuminating ray that lenticule forms the even face of rectangle large tracts of land of setting the angle of divergence through spot shaping lens, homogenize, is incident upon by the rough surface of acquisition target and forms the diffuse reflection phenomenon to all directions reflection.
Said narrow-band low pass optical filter is that center wave band is that 940nm, passband percent of pass are 70%, the height of bandwidth ± 20nm, passband bearing accuracy ± 5nm is by the narrow-band low pass optical filter of the degree of depth.
The film system of the optical thin film of said narrow-band low pass optical filter is constituted by long wave pass filter film and short-pass filter coating, and coating materials comprises the SiO that can obtain low-index film
2Coating materials, can obtain the TiO of high refractive index layer
2Coating materials and Si coating materials.
The material of first, second and the 3rd lens of said three-chip type non-spherical lens group is respectively APL5014DO, POLYSTYR and ARTON_D4531.
The beneficial effect of the present invention and prior art contrast is:
The present invention adopts the 940nm infrared laser; Realize the active illumination of the high uniform illumination face of rectangle large tracts of land through spot shaping lens and homogenize lenticule; Adopt the high light of 940nm narrow-band low pass optical filter outside 940nm in the surround lighting; Significantly strengthen the performance of anti-ambient light interference, through undistorted, the big depth of field of high conformity visual angle realization of aspherics imaging lens set, the image effect of high-resolution, the final image that obtains has the big depth of field, high s/n ratio, high definition, high-contrast, distortionless advantage; Effectively improve the recognition accuracy and the recognition speed of facial image, can be widely used in work attendance, gate inhibition and security protection monitoring field.
Description of drawings
Fig. 1 is the composition synoptic diagram of the specific embodiment of the invention;
Fig. 2 is the transmittance curve figure of the infrared 940nm narrow-band low pass optical filter of Fig. 1.
Embodiment
Below in conjunction with embodiment and contrast accompanying drawing the present invention will be described.
A kind of IMAQ and recognition device of the active illumination shown in Fig. 1～2; Comprise lighting source assembly and IMAQ recognizer component, the IMAQ recognizer component comprises narrow-band low pass optical filter 4, non-spherical lens set of shots assembly 5 and the imageing sensor 6 that is successively set on a light path.The lighting source assembly comprises laser instrument 1, spot shaping lens 2 and the homogenize processing lenticule 3 that is successively set on another light path.
It is holographic optical screens that lenticule 3 is handled in homogenize, is used for the spread laser beam angle of divergence to setting value, increases illumination zone, forms area source, can illumination is unsaturated because laser light intensity is big.Laser beam through spot shaping lens 2, homogenize handle lenticule 3 form equal or be slightly larger than field angle the angle of divergence vertically and the horizontal direction ratio be the active illuminating ray of 4: 3 the even face of rectangle large tracts of land, be not less than 800 μ W/cm apart from the 940nm illumination of half meter far away of light source outgoing place
2, be incident upon by the rough surface of acquisition target 7 and form diffuse reflection phenomenon to all directions reflection.
Narrow-band low pass optical filter 4 is the infrared 940nm narrow-band low pass optical filters with film structure of optical thin film, and center wave band is that 940nm, passband percent of pass are 70%, bandwidth ± 20nm, passband bearing accuracy ± 5nm.The film system of the optical thin film of narrow-band low pass optical filter 4 is constituted by long wave pass filter film and short-pass filter coating, and coating materials comprises the SiO that can obtain low-index film
2Coating materials, can obtain the TiO of high refractive index layer
2Coating materials and Si coating materials.Narrow-band low pass optical filter 4 is used for filtering the whole light outside the surround lighting 940nm that comprises sunlight, daylight lamp and incandescent lamp; Effectively get into imageing sensor by it; Performance with the anti-ambient light interference of remarkable enhancing; Weaken the adverse effect of the surround lighting of especially different periods of surround lighting to image; The high bright uniform area light source that laser sends reflects through face, and light filters through narrow-band low pass optical filter 4 and obtains more real facial gray level image, and no matter all is the perfect figure picture of basically identical under the environment light condition of what period and different illumination.
Non-spherical lens set of shots assembly 5 are system stop between first lens and second lens and lens by just-negative-negative tactic three-chip type non-spherical lens set of shots assembly; The material of first, second and the 3rd lens of three-chip type non-spherical lens set of shots assembly is respectively APL5014DO, POLYSTYR and ARTON_D4531; Be used to shorten the total length of camera lens and guarantee image quality, realize the image effect of undistorted, the big depth of field, high-resolution at said imageing sensor.The camera lens effective focal length is 4.5mm, and the modulation transfer function when fringe density is 300lp/mm (Modulation Transfer Function, initialism are MTF) value is all greater than 0.5, and the illumination of all visual fields is all more than 0.9.
Above content is to combine concrete preferred implementation to the further explain that the present invention did, and can not assert that practical implementation of the present invention is confined to these explanations.Those of ordinary skill for technical field under the present invention; Under the prerequisite that does not break away from the present invention's design, make some alternative or obvious modification that are equal to; And performance or purposes are identical, all should be regarded as belonging to the scope of patent protection that the present invention is confirmed by claims of being submitted to.
Claims (8)
1. the initiatively IMAQ and the recognition device of illumination; Comprise lighting source assembly and IMAQ recognizer component; Said IMAQ recognizer component comprises narrow-band low pass optical filter, non-spherical lens set of shots assembly and the imageing sensor that is successively set on a light path, it is characterized in that:
Said lighting source assembly comprises laser instrument, spot shaping lens and the homogenize processing lenticule that is successively set on another light path;
Said laser instrument is under power drives, to produce the infrared laser of stimulated emission 940nm wave length laser beams as the active lighting source.
2. the IMAQ and the recognition device of active illumination as claimed in claim 1 is characterized in that:
Said spot shaping lens are a kind of in rectangular lens, oval lenticule and the binary optical optical grating element, are used for the light beam full circle of said laser instrument and homogenize be treated to being fit to the rectangular large area uniform light spots that said imageing sensor extracts.
3. according to claim 1 or claim 2 the IMAQ and the recognition device of active illumination is characterized in that:
It is holographic optical screen, single or double frosted glass, hair organic glass that lenticule is handled in said homogenize, and a kind of in the transparent plastic of low smooth finish, is used for the spread laser beam angle of divergence to setting value, increases illumination zone, forms area source.
4. the IMAQ and the recognition device of active illumination as claimed in claim 3 is characterized in that:
The setting value of the said angle of divergence equals or is slightly larger than field angle.
5. according to claim 1 or claim 2 the IMAQ and the recognition device of active illumination is characterized in that:
Said narrow-band low pass optical filter is the infrared 940nm narrow-band low pass optical filter with film structure of optical thin film, is used for filtering the whole light outside the surround lighting 940nm that comprises sunlight, daylight lamp and incandescent lamp.
6. the IMAQ and the recognition device of active illumination as claimed in claim 5 is characterized in that:
Said narrow-band low pass optical filter is that center wave band is that 940nm, passband percent of pass are 70%, the height of bandwidth ± 20nm, passband bearing accuracy ± 5nm is by the narrow-band low pass optical filter of the degree of depth.
7. according to claim 1 or claim 2 the IMAQ and the recognition device of active illumination is characterized in that:
Said non-spherical lens set of shots assembly be system stop between first lens and second lens and lens by just-negative-negative tactic three-chip type non-spherical lens set of shots assembly, be used to shorten the total length of camera lens and guarantee image quality at said imageing sensor.
8. the IMAQ and the recognition device of active illumination as claimed in claim 7 is characterized in that:
The material of first, second and the 3rd lens of said three-chip type non-spherical lens group is respectively APL5014DO, POLYSTYR and ARTON_D4531.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104021387A (en) * | 2014-04-04 | 2014-09-03 | 南京工程学院 | Face image illumination processing method based on visual modeling |
| CN104516063A (en) * | 2013-09-27 | 2015-04-15 | 山东华光光电子有限公司 | Device for increasing output beam spatial divergence angle and homogenizing light spot and method for manufacturing same |
| CN104933393A (en) * | 2014-12-17 | 2015-09-23 | 东莞市中控电子技术有限公司 | Method for obtaining face image under strong light and device thereof |
| CN107004139A (en) * | 2014-12-01 | 2017-08-01 | 欧司朗股份有限公司 | By means of the image procossing of cross-correlation |
| CN107392955A (en) * | 2017-08-05 | 2017-11-24 | 刘承昊 | A kind of depth of field estimation device and method based on brightness |
| CN108289179A (en) * | 2018-02-08 | 2018-07-17 | 深圳泰华安全技术工程有限公司 | A method of improving video signal collection anti-interference ability |
| WO2018196268A1 (en) * | 2017-04-24 | 2018-11-01 | 浙江舜宇光学有限公司 | Iris lens |
| CN108780231A (en) * | 2018-05-09 | 2018-11-09 | 深圳阜时科技有限公司 | Pattern projecting device, image acquiring device, identity recognition device and electronic equipment |
| CN109186555A (en) * | 2018-10-16 | 2019-01-11 | 凌云光技术集团有限责任公司 | A kind of Polaroid system and method for laser ablation terminal shell PVD coating |
| CN109697422A (en) * | 2018-12-19 | 2019-04-30 | 深圳市瑞立视多媒体科技有限公司 | Optics motion capture method and optics motion capture cameras |
| JP2019139025A (en) * | 2018-02-08 | 2019-08-22 | オリンパス株式会社 | Information acquisition device |
| CN111226361A (en) * | 2017-10-23 | 2020-06-02 | 亮锐控股有限公司 | VCSEL-based biometric identification device |
| CN113218826A (en) * | 2021-05-24 | 2021-08-06 | 安徽工程大学 | Light path system of particle counter sensor |
| US11112589B2 (en) | 2018-01-02 | 2021-09-07 | Zhejiang Sunny Optical Co., Ltd | Optical imaging lens assembly |
| CN113566960A (en) * | 2020-04-28 | 2021-10-29 | 广东博智林机器人有限公司 | Configuration method and system of visual sensor, electronic device and medium |
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Cited By (18)
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| CN104516063A (en) * | 2013-09-27 | 2015-04-15 | 山东华光光电子有限公司 | Device for increasing output beam spatial divergence angle and homogenizing light spot and method for manufacturing same |
| CN104021387A (en) * | 2014-04-04 | 2014-09-03 | 南京工程学院 | Face image illumination processing method based on visual modeling |
| CN104021387B (en) * | 2014-04-04 | 2017-03-08 | 南京工程学院 | The facial image illumination processing method of view-based access control model modeling |
| CN107004139A (en) * | 2014-12-01 | 2017-08-01 | 欧司朗股份有限公司 | By means of the image procossing of cross-correlation |
| CN104933393A (en) * | 2014-12-17 | 2015-09-23 | 东莞市中控电子技术有限公司 | Method for obtaining face image under strong light and device thereof |
| WO2018196268A1 (en) * | 2017-04-24 | 2018-11-01 | 浙江舜宇光学有限公司 | Iris lens |
| CN107392955A (en) * | 2017-08-05 | 2017-11-24 | 刘承昊 | A kind of depth of field estimation device and method based on brightness |
| CN107392955B (en) * | 2017-08-05 | 2020-09-15 | 刘承昊 | Depth of field estimation device and method based on brightness |
| CN111226361A (en) * | 2017-10-23 | 2020-06-02 | 亮锐控股有限公司 | VCSEL-based biometric identification device |
| US11112589B2 (en) | 2018-01-02 | 2021-09-07 | Zhejiang Sunny Optical Co., Ltd | Optical imaging lens assembly |
| JP2019139025A (en) * | 2018-02-08 | 2019-08-22 | オリンパス株式会社 | Information acquisition device |
| CN108289179A (en) * | 2018-02-08 | 2018-07-17 | 深圳泰华安全技术工程有限公司 | A method of improving video signal collection anti-interference ability |
| CN108780231A (en) * | 2018-05-09 | 2018-11-09 | 深圳阜时科技有限公司 | Pattern projecting device, image acquiring device, identity recognition device and electronic equipment |
| CN109186555A (en) * | 2018-10-16 | 2019-01-11 | 凌云光技术集团有限责任公司 | A kind of Polaroid system and method for laser ablation terminal shell PVD coating |
| CN109186555B (en) * | 2018-10-16 | 2021-05-14 | 凌云光技术股份有限公司 | One-time imaging system and method for removing PVD (physical vapor deposition) coating of terminal shell by laser |
| CN109697422A (en) * | 2018-12-19 | 2019-04-30 | 深圳市瑞立视多媒体科技有限公司 | Optics motion capture method and optics motion capture cameras |
| CN113566960A (en) * | 2020-04-28 | 2021-10-29 | 广东博智林机器人有限公司 | Configuration method and system of visual sensor, electronic device and medium |
| CN113218826A (en) * | 2021-05-24 | 2021-08-06 | 安徽工程大学 | Light path system of particle counter sensor |
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