CN100405391C - Living body fingerprint collecting method and apparatus - Google Patents
Living body fingerprint collecting method and apparatus Download PDFInfo
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- CN100405391C CN100405391C CNB2005101093146A CN200510109314A CN100405391C CN 100405391 C CN100405391 C CN 100405391C CN B2005101093146 A CNB2005101093146 A CN B2005101093146A CN 200510109314 A CN200510109314 A CN 200510109314A CN 100405391 C CN100405391 C CN 100405391C
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Abstract
The invention relates to a living body finger palm print collecting method and device. The device includes prism, light source, components of a lens, and collecting device formed by image sensor. The method includes the following steps: jointing the prism collecting side with the living body finger palm to form finger palm pattern; opening the infrared source to make light beam enter the prism from the incidence plane and project on the finger palm pattern; reflecting the light beam by the collecting side to form image light beam with finger palm pattern and 700nm-1100nm wavelength range and outputting by the image output side; projecting the image light beam to the image sensor by the components of a lens; transforming the light signal into electrical signal. The invention uses color image sensor in photo-electricity finger palm print collecting which can reduce product cost without color difference and image resolution reducing.
Description
Technical field
The present invention relates to a kind of living body fingerprint collecting method and device, this method and device throw light on, rely on imageing sensor to carry out conversion of signals with specific infrared light supply, realize the living body fingerprint collection.
Background technology
In prior art, fingerprint, palmmprint photoelectricity acquisition method commonly used are to utilize the total reflection characteristic of prism to realize.Prism exists and divides light action, influences the picture quality of fingerprint, palmmprint for avoiding aberration, must adopt monochromatic source and monochrome image sensor.The general ruddiness that adopts is as monochromatic source, and what individual program was used is infrared light supply.Chinese patent 94239537.9 discloses a kind of infrared fingerprint identifier, comprise housing, camera and computing machine, the isosceles right angle prism that two inclined-planes are positioned at housing is installed in the case panel fenestra, fingerprint image camera and infrared light generator are housed in the housing, one image processing board links with camera and computing machine respectively, and one group of fingerprint identification button is housed on the housing.This infrared fingerprint identifier simple structure, the collection of fingerprint image, store, call and relatively differentiate fast, convenient, accurately.It is " infrared light of specific wavelength is according to providing the most responsive light source to camera " that this patent adopts the purpose of infrared light supply.
In general, monochrome image sensor is more cheap than the price of color image sensor, and the fingers and palms print image is monochromatic, furthers investigate so there is no need that color image sensor is applied to the collection of optics living body fingerprint.Along with the fast development of semiconductor image sensor technology, driven popularizing of digital camera, Digital Video.Because color image sensor is more much bigger than the market of monochrome image sensor, and the appearance of camera mobile phone, further stimulated the market demand of color image sensor.Therefore, production firm is now all based on the production color image sensor, and optics fingers and palms line harvester CMOS monochrome image sensor commonly used is difficult to find on market, and its price is more taller than colour.In order to address these problems, some design proposal is attempting the color image sensor of market share height and ample supply and prompt delivery is applied to optics fingers and palms line harvester.These devices still adopt the design proposal of monochromatic visible light as light source, generally with redness or green light as light source.But brought the problem of image sensor resolutions loss thus.Accompanying drawing 1 is that a kind of line of pixels of color image sensor lists intention, and spread pattern is the Bayer pattern.Its green pixel accounts for 1/2nd of whole pixels, and red, blue pixel respectively accounts for 1/4th of whole pixels, and every kind of color pixel is only experienced a kind of light of color.The problem that has the sensor resolution reduction by accompanying drawing 1 as can be seen for monochrome image.When adopting green light source, have only green pixel sensitization, image resolution ratio is reduced to 1/2nd of sensor resolution; When adopting redness or blue-light source, have only redness or blue pixel sensitization, image resolution ratio is reduced to 1/4th of sensor resolution.Therefore, need to propose a kind of new living body fingerprint collecting method and device to address the above problem.
Summary of the invention
The object of the present invention is to provide a kind of living body fingerprint collecting method and device, this method adopts specific infrared light supply to throw light on, adopt color image sensor to carry out conversion of signals, can realize not having the living body fingerprint collection of resolution loss, adopt infrared filtering film, sheet, can eliminate the interference of ambient visible light.
The objective of the invention is to be achieved through the following technical solutions: a kind of living body fingerprint collecting method, use a harvester that constitutes by prism, light source, lens assembly, imageing sensor, it is characterized in that:
Described light source is an infrared light supply, makes infrared light supply send the monochrome collection light beam that wavelength coverage is 700nm～1100nm;
Described prism possesses a collection beam incident surface at least, an image output face, a collection face;
The collection face of described prism is fitted with the live body fingers and palms that will gather, on collection face, form fingers and palms line pattern;
Open described infrared light supply, make described collection enter described prism by the described plane of incidence and project on the described fingers and palms line pattern, will gather with light beam by collection face and reflect to form the image beam that is loaded with fingers and palms line pattern and export by described image output face with light beam;
Described image beam is projected on the imageing sensor by lens assembly, convert light signal to electric signal, finish the collection of living body fingerprint by this imageing sensor.
A kind of living body fingerprint harvester has a housing, it is characterized in that: in case top a prism is set, this prism possesses a collection beam incident surface at least, an image output face, a collection face; Be provided with the infraluminescence plate in the described plane of incidence one side, the normal of this infraluminescence plate and described collection beam incident surface quadrature, be provided with lens assembly in image output face one side, the output terminal of this lens assembly is provided with an imageing sensor, the optical axis of this lens assembly and described image output face quadrature; Described infraluminescence plate, lens assembly, imageing sensor are installed in the described housing.
Compared with the prior art the present invention has following advantage:
1, the present invention utilizes the spectral response characteristic of color image sensor,, makes color image sensor be applied to the collection of photoelectricity fingerprint, palmmprint and can not produce the problem that aberration and image resolution ratio reduce as light source with near infrared monochromatic light.
2, the present invention has avoided the influence of monochrome image sensor price height, supply of material wild effect, has reduced cost of products.
3, the present invention utilizes infrared filtering film, sheet to stop visible light to pass through, and has eliminated the interference of ambient light effects and the stain on collection face, has improved the quality of images acquired.
Description of drawings
Fig. 1 is that a kind of line of pixels of color image sensor lists intention
Fig. 2 is embodiments of the invention one synoptic diagram
Fig. 3 is the spectral response figure of color image sensor
Fig. 4 is the spectral distribution graph of infrarede emitting diode
Fig. 5 is an apparatus structure synoptic diagram of the present invention
Fig. 6 is a longitudinal sectional view of the present invention
Fig. 7 is vertical view of the present invention (cuing open the view at the body top of shelling)
Fig. 8 is prism figure of the present invention
Fig. 9 is an another kind of prism structure synoptic diagram of the present invention
Specific embodiment
Embodiment one:
A kind of living body fingerprint collecting method referring to Fig. 2, uses a harvester that is made of prism 2, light source 1, lens assembly 4, imageing sensor 5, and its step is:
Described light source is an infrared light supply, makes infrared light supply send the monochrome collection light beam that wavelength coverage is 700nm～1100nm; This infrared light supply can adopt GL4910 infraluminescence pipe product to form array; Described collection is meant the set of the light that light source sends with light beam.
Described prism possesses a collection beam incident surface at least, an image output face, a collection face;
The collection face of described prism is fitted with the live body fingers and palms that will gather, on collection face, form fingers and palms line pattern; So-called live body fingers and palms are meant people's finger, toe, palm, sole.So-called fingers and palms line pattern is meant people's finger line pattern, toe line pattern, palm line pattern, sole line pattern.
Open described infrared light supply, make to gather and enter described prism by the described plane of incidence and project on the described fingers and palms line pattern with light beam, to be gathered with light beam by collection face and reflect to form the image beam that is loaded with fingers and palms line pattern and export by described image output face, the wavelength of this image beam is in 700nm～1100nm scope;
Described image beam is projected on the imageing sensor by lens assembly, convert light signal to electric signal, finish the collection of living body fingerprint by this imageing sensor.Described lens assembly is meant the combination of a plurality of eyeglasses that can imaging, belongs to the scope of prior art, and present embodiment is not described in detail.
In the living body fingerprint gatherer process of routine, usually contaminated on the collection face of prism, be subjected to the irradiation of surround lighting, its spectrum Main Ingredients and Appearance is at visible-range, if untimely cleaning will influence the quality of fingers and palms line pattern.For this reason, the present invention passes through the infrared light of 850nm wavelength in the image beam image beam processings (referring to the optical filter 3 that is provided with among Fig. 2) that filter of output, the image beam of formation 850nm wavelength, stop visible light to pass through, eliminated the interference of the stain on ambient light effects and the collection face.
In order to reduce the cost of equipment used in the present invention, the present invention projects described image beam on the color image sensor by lens assembly, converts light signal to electric signal by this imageing sensor; Adjust the gain of three passages of red, green, blue of described color image sensor, make it in 700nm～1100nm wavelength coverage, identical picture signal output intensity is arranged for identical illumination.
Embodiment two:
Referring to Fig. 5, Fig. 6, Fig. 7, Fig. 8, a kind of living body fingerprint harvester has a housing 10, in case top acquisition window 11 is set, a prism 12 is housed on it, and this prism possesses collection at least with 123, one image output faces of beam incident surface 122, a collection face 121; Be provided with infraluminescence plate 13 in the described plane of incidence one side, the normal of this infraluminescence plate with gather with beam incident surface quadrature (also can be arranged to basic quadrature), be provided with lens assembly 14 in image output face one side, the output terminal of this lens assembly is provided with an imageing sensor 15, the optical axis of this lens assembly and described image output face quadrature; Described infraluminescence plate, lens assembly, imageing sensor are installed in the described housing.Referring to Fig. 8, the prism that present embodiment uses is a polygon prism, and the collection face of this prism is arranged on the housing end face, and beam incident surface is arranged in the housing, and the image output face is arranged in the housing, and its output optical axis is the level of state.Referring to Fig. 9, prism of the present invention can use another version, and this prism structure and prism structure shown in Figure 8 are inequality, but its principle is identical with effect.
In the present embodiment, the infraluminescence plate adopts the Japanese SHARP GL4910 of company infraluminescence pipe product to form array.Described infraluminescence plate surface is provided with even tabula rasa, makes the infraluminescence plate luminous even, soft.Referring to Fig. 4, the peak emission wavelength of infrarede emitting diode is 850nm.
In the present embodiment, both monochrome image sensor can be adopted, also color image sensor can be adopted.For the needs that reduce cost and be easy to obtain, the color image sensor OV9620 of first-selected U.S. Omnivision company, its spectral response is referring to Fig. 3, and this color image sensor red, green, blue pixel sensitivity curve has a peak value at the 840nm place, and susceptibility is close.That is to say for identical illumination,, make the pixel of sensor obtain 100% utilization at the red, green, blue pixel of 840nm place whole sensor stronger and approaching signal of output amplitude all.When reality is used the color cmos digital image sensor, should make it identical signal output intensity be arranged by the gain of three passages of red, green, blue is set, to obtain the effect identical with monochrome image sensor to identical illumination.
For the fingers and palms line pattern that will gather outputs to computer equipment, can add usb circuit in the present embodiment.
The principle of fingers and palms line of the present invention imaging is: under the illumination of infrared light supply, when finger or palm by on the collection face of prism the time, skin lines and this face contact portion have been destroyed the total reflection condition of light, and the paddy portion of fingerprint or palmmprint does not contact with the collection face of prism, but this place is the total reflection infrared light still, thereby forms the different lines image of light and shade.
In order to improve picture quality of the present invention, can on the image output face of described prism and the element between the imageing sensor, infrared transmission visible absorbance optical filter be set, present embodiment is to be provided with infrared transmission visible absorbance optical filter (not showing among the figure) between the input end of the image output face of described prism and lens assembly, can also on the image output face of described prism and the element between the imageing sensor, infrared band pass filter be set, present embodiment is to be provided with infrared band pass filter between the input end of the image output face of described prism and lens assembly, can also on the image output face of described prism and the element between the imageing sensor, infrared transmission visible absorbance filter coating be set, present embodiment is to be provided with infrared transmission visible absorbance filter coating (this film can adopt special process to be plated on the minute surface) between the input end of the image output face of described prism and lens assembly, the logical filter coating of infrared band can also be set on the image output face of described prism and the element between the imageing sensor, perhaps between the output terminal of described lens assembly and imageing sensor, be provided with the logical filter coating (this film can adopt special process to be plated on the minute surface) of infrared band.
Claims (3)
1. a living body fingerprint collecting method uses a harvester that is made of prism, light source, lens assembly, imageing sensor, it is characterized in that:
Described light source is an infrared light supply, makes infrared light supply send the monochrome collection light beam that wavelength coverage is 700nm～1100nm;
Described prism possesses a collection beam incident surface at least, an image output face, a collection face;
The collection face of described prism is fitted with the live body fingers and palms that will gather, on collection face, form fingers and palms line pattern;
Open described infrared light supply, make described collection enter described prism by the described plane of incidence and project on the described fingers and palms line pattern, will gather with light beam by collection face and reflect to form the image beam that is loaded with fingers and palms line pattern and export by described image output face with light beam;
Described image beam is projected on the imageing sensor by lens assembly, convert light signal to electric signal, finish the collection of living body fingerprint by this imageing sensor.
2. living body fingerprint collecting method according to claim 1 is characterized in that: with processings that filter of the image beam of described image output face output, the infrared light of 850nm wavelength in the image beam is passed through, the image beam of formation 850hm wavelength.
3. living body fingerprint collecting method according to claim 1 is characterized in that: described image beam is projected on the color image sensor by lens assembly, convert light signal to electric signal by this imageing sensor; Adjust the gain of three passages of red, green, blue of described color image sensor, make it in 700nm～1100nm wavelength coverage, identical picture signal output intensity is arranged for identical illumination.
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| CNB2005101093146A CN100405391C (en) | 2005-10-14 | 2005-10-14 | Living body fingerprint collecting method and apparatus |
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| CNB2005101093146A CN100405391C (en) | 2005-10-14 | 2005-10-14 | Living body fingerprint collecting method and apparatus |
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| CN100405391C true CN100405391C (en) | 2008-07-23 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101211410B (en) * | 2007-12-25 | 2010-09-15 | 哈尔滨工业大学 | Multi-light spectrum palm print identity authentication method and its special-purpose collection instrument |
| JP5186929B2 (en) * | 2008-01-21 | 2013-04-24 | 日本電気株式会社 | Authentication imaging device |
| JP4548504B2 (en) * | 2008-04-08 | 2010-09-22 | 日本電気株式会社 | Authentication imaging apparatus, authentication imaging method, and authentication imaging program |
| CN102103685A (en) * | 2009-12-18 | 2011-06-22 | 茂晖科技股份有限公司 | Optical fingerprint identification device with living body scanning function and identification method |
| CN102436579B (en) * | 2011-03-31 | 2014-09-24 | 北京中控科技发展有限公司 | High-definition infrared fingerprint acquisition device |
| TWI549065B (en) * | 2015-01-26 | 2016-09-11 | Gingytech Technology Inc | Fingerprint identification method and device thereof |
| CN105335693B (en) * | 2015-07-30 | 2018-11-09 | 江苏邦融微电子有限公司 | A kind of optical fingerprint systems and its detection method based on discriminating fingerprint residues |
| CN107256068B (en) | 2017-05-12 | 2019-08-23 | Oppo广东移动通信有限公司 | The acquisition method and Related product of fingerprint |
| WO2020124511A1 (en) * | 2018-12-20 | 2020-06-25 | 深圳市汇顶科技股份有限公司 | Fingerprint recognition method, fingerprint recognition device and electronic apparatus |
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| CN2201059Y (en) * | 1994-10-25 | 1995-06-21 | 李虹 | Infrared fingerprint recognizer |
| CN1187654A (en) * | 1996-12-06 | 1998-07-15 | 山武·霍尼韦尔公司 | Fingerprint input apparatus |
| RU2154842C1 (en) * | 1999-10-14 | 2000-08-20 | Государственное предприятие "Всероссийский научно-исследовательский институт физико-технических и радиотехнических измерений" | Technique for detection and identification of underwater target |
| US20040061855A1 (en) * | 2000-12-21 | 2004-04-01 | Hansjorg Klock | Optical sensor device and method for spectral analysis |
| CN2647989Y (en) * | 2003-10-16 | 2004-10-13 | 王立丰 | Handle of door with living body finger print identification of auto-photo-induction |
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2005
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2201059Y (en) * | 1994-10-25 | 1995-06-21 | 李虹 | Infrared fingerprint recognizer |
| CN1187654A (en) * | 1996-12-06 | 1998-07-15 | 山武·霍尼韦尔公司 | Fingerprint input apparatus |
| RU2154842C1 (en) * | 1999-10-14 | 2000-08-20 | Государственное предприятие "Всероссийский научно-исследовательский институт физико-технических и радиотехнических измерений" | Technique for detection and identification of underwater target |
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| CN2647989Y (en) * | 2003-10-16 | 2004-10-13 | 王立丰 | Handle of door with living body finger print identification of auto-photo-induction |
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