CN104434130A - Electrochromic principle based roll fingerprint acquisition method - Google Patents
Electrochromic principle based roll fingerprint acquisition method Download PDFInfo
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- CN104434130A CN104434130A CN201410709861.7A CN201410709861A CN104434130A CN 104434130 A CN104434130 A CN 104434130A CN 201410709861 A CN201410709861 A CN 201410709861A CN 104434130 A CN104434130 A CN 104434130A
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- fingerprint
- principle based
- fingerprint acquisition
- based roll
- acquisition method
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/117—Identification of persons
- A61B5/1171—Identification of persons based on the shapes or appearances of their bodies or parts thereof
- A61B5/1172—Identification of persons based on the shapes or appearances of their bodies or parts thereof using fingerprinting
Abstract
The invention relates to an electrochromic principle based roll fingerprint acquisition method and belongs to the electrochemical field. A cyclic voltammetry method is adopted to perform electro-deposition on the surface of an indium tin oxide (ITO) glass electrode so as to obtain a Prussian blue film. Suitable acquisition conditions are created through operating voltage and temperature and humidity control. The electrochromic principle based roll fingerprint acquisition method is simple and easy to operate, quick and reliable, and the problems existing during fingerprint acquisition are avoided. Obtained fingerprint images are clear and reliable, and the electrochromic principle based roll fingerprint acquisition method has great significance on basic data acquisition for fingerprint database establishment.
Description
Technical field
The invention belongs to electrochemical field.
Background technology
Fingerprint can as the important means of person identification, and in addition, fingerprint recognition is at solving criminal cases, and the effect of fighting crime in molecular efforts becomes increasingly conspicuous, become countries in the world investigation department search with asserting crime people the most directly, the approach of the most quick, most convenient
1-4.Finger print information plays irreplaceable effect in the identity verify of criminal investigation and case detection, and a lot of country has established complete fingerprint base all in the world, and in China's fingerprint base, fingerprint is complete, and fingerprint quality is not high, has become one of major obstacle that fingerprint solves a case.
At present, fingerprint collecting device mainly contains live body optical profile type, condenser type and pressure-sensitive.For technical specifications such as resolution and collection areas, public security industry has defined the world and domestic standard.Because rolling stamp gather fingerprint area comparatively large, contrast link is after collection more convenient, so public security industry generally adopts rolling stamp fingerprint
5-6.Current China public security system rolling stamp method used uses ink stamp always, but the wiping of finger when rolling ink is rubbed, the difference in stamp direction is all the factor affecting fingerprint clear degree, is done the definition that wet degree also directly has influence on fingerprint stamp in addition by the finger of stamp people.Because conventional fingerprint stamp method causes fingerprint fuzzy unclear, much normally cannot key in computer fingerprint automatic recognition system, cause fingerprint management work to stagnate.For this problem, China scientific worker also carries out constantly innovation and research, but no matter be attempt to utilize a kind of curved surface carry out matching finger surface or adopt track algorithm, all do not obtain satisfied effect, no matter because be the curved surface of finger or the rolling of finger on acquisition platform has very large randomness, very difficult model is described
7.
List of references
[1]H.C.Lee,R.E.Gaensslen,Advances in Fingerprint Technology.CRC Press,Boca Raton,2nd edition,2001.
[2]Pompi Hazarika,Sue M.Jickells and David A.Russell,Rapid detection of drugmetabolites in latent fingermarks.Analyst,2009,134,93-96.
[3]Xanthe Spindler,Oliver Hofstetter,Andrew M.McDonagh,Claude Roux andChris Lennard,Enhancement of latent fingermarks on non-porous surfaces usinganti-L-amino acid antibodies conjugated to gold nanoparticles.Chem.Commun.,2011,47,5602-5604.
[4]Amanda M.Boddis and David A.Russell,Development of aged fingermarksusing antibody-magnetic particle conjugates.Anal.Methods,2012,4,637-641.
[5]Amanda M.Boddis and David A.Russell,Simultaneous development anddetection of drug metabolites in latent fingermarks using antibody-magnetic particleconjugates,Anal.Methods,2011,3,519.
[6]Matias Sametband,Itzhak Shweky,Uri Banin,Daniel Mandler and JosephAlmog.Application of nanoparticles for the enhancement of latent fingerprints.Chem.Commun.,2007,1142-1144.
[7]J.Zhou,D.He,G.Rong and ZH.Q.Bian.Effective algorithm for rolledfingerprint construction.Electronics Letters,2001,37(8):492-494.
Summary of the invention
ITO electrode obtains with cyclic voltammetry electro-deposition Prussian blue (PB) film of dense uniform.Electrodeposit liquid used is the mixed liquor of 3-6mmol/L iron chloride and the potassium ferricyanide, and adjustment pH is 2-5.Then by this electrode slice, be connected in fingerprint collecting circuit, apply 10-60V DC voltage, be 30-85% at relative humidity, temperature is within the scope of 1-50 DEG C, and gathered person's finger rolls in obtained prussian blue film, can show the picture rich in detail of its fingerprint.After obtaining this fingerprint image, this ITO electrode sheet is inserted in potassium chloride (concentration range is 0.5-1.5mol/L) solution as working electrode, using Ag/AgCl as reference electrode, platinum filament is as to electrode, connect loop, apply constant potential backward voltage (voltage range is 1-1.5V), fingerprint disappears, the navy blue before prussian blue film returns to again.The collection repeatedly of fingerprint can be realized like this.Compare traditional acquisition system, adopt electrochromic principle to carry out fingerprint collecting, have fast, accurately, the multiple advantage such as to reuse, disposable Quick Acquisition can be met and to roll the task of full fingerprint, and without the need to carrying out the integrated work of subsequent pictures.
Accompanying drawing explanation
The cyclic voltammogram of Fig. 1 electro-deposition PB film.
The scanning electron microscope (SEM) photograph of Fig. 2 PB film.
The fingerprint image (relative humidity of a, b, c is respectively 60%, 70%, 80%) gathered under Fig. 3 different humidity.
The fingerprint image (voltage of a, b, c is respectively 40V, 50V, 58V) gathered under the different voltage of Fig. 4.
Fig. 5 rolls the graphical analysis of full fingerprint.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described:
1) using ITO as working electrode (before use respectively ultrasonic 5min in ultra-pure water and dehydrated alcohol), using Ag/AgCl as reference electrode, platinum filament is as to electrode, cyclic voltammetry is adopted to obtain navy blue prussian blue film (gained cyclic voltammogram is shown in Fig. 1, and the scanning electron microscope (SEM) photograph of PB film is shown in Fig. 2) at ITO electrode substrates.
2) by controlling the water temperature of water-bath, regulate the humidity of humidity control case to obtain suitable humidity range (Fig. 3 is shown in the impact of humidity on fingerprint image, and when relative humidity is 70% time, fingerprint image is the most clear).
3) switch on power, gathered person's finger is placed on PB film and regulates suitable voltage fast scroll (Fig. 4 is shown in the impact of voltage on fingerprint image, when operating voltage at 58V time, fingerprint image is the most clear, and considering that voltage is high has certain harm not heighten voltage again to human body).
4) cut off the electricity supply, taking pictures after being taken out by the PB film with fingerprint image obtains this fingerprint image (see Fig. 5).Then inserted in Klorvess Liquid as working electrode by this ITO electrode sheet, using Ag/AgCl as reference electrode, platinum filament is as to electrode, connect loop, apply constant potential backward voltage, voltage range is 1-1.5V, fingerprint disappears, the navy blue before prussian blue film returns to again.
Example 1
Be 70% by controlling the lower water temperature relative humidity of water-bath, is connected with the ITO electrode being coated with PB film by gathered person's finger, adjustment operation voltage is 58V, can obtain fingerprint image clearly with pointing fast scroll on PB film.The fingerprint image obtained is comparatively clear, and the second-level message comprising fingerprint itself also can be seen (see Fig. 5) by naked eyes.After obtaining fingerprint image, this ITO electrode sheet is inserted in Klorvess Liquid, using Ag/AgCl as reference electrode as working electrode, platinum filament, as to electrode, connects loop, applies constant potential backward voltage 1.5V, fingerprint disappears, the navy blue before prussian blue film returns to again.
Example 2
Be 80% by controlling the lower water temperature relative humidity of water-bath, is connected with the ITO electrode being coated with PB film by gathered person's finger, adjustment operation voltage is 58V, can obtain fingerprint image (see Fig. 3 c) with pointing fast scroll on PB film.But because relative humidity is comparatively large, ion transport excessive velocities, the fingerprint image obtained is clear not, but still substantially can see fingerprint clearly.After obtaining fingerprint image, this ITO electrode sheet is inserted in Klorvess Liquid, using Ag/AgCl as reference electrode as working electrode, platinum filament, as to electrode, connects loop, applies constant potential backward voltage 1.2V, fingerprint disappears, the navy blue before prussian blue film returns to again.
Example 3
Be 70% by controlling the lower water temperature relative humidity of water-bath, connected with the ITO electrode being coated with PB film by gathered person's finger, adjustment operation voltage is 40V, and clean finger is fast scroll (about 3-5 second) on PB film.Because operating voltage is too small, the voltage assigned in ITO electrode is too little, and metachromasia is carried out not thorough, and the fingerprint image obtained can only see less finger print information (see Fig. 4 a).After obtaining fingerprint image, this ITO electrode sheet is inserted in Klorvess Liquid, using Ag/AgCl as reference electrode as working electrode, platinum filament, as to electrode, connects loop, applies constant potential backward voltage 1.1V, fingerprint disappears, the navy blue before prussian blue film returns to again.
Claims (2)
1. the present invention is a kind of method gathering rolling fingerprint based on electrochromism principle.Cyclic voltammetry is adopted to obtain prussian blue film in ITO electrode surface electrical deposition, by operating voltage, and the control of temperature and humidity, the full fingerprint realized rolling carries out Quick Acquisition.
2. according to claim 1, it is 10-60V that rolling fingerprint gathers required voltage, and RH range is 30-85%, and temperature range is 1-50 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410709861.7A CN104434130B (en) | 2014-11-27 | 2014-11-27 | Based on the method that electrochromism principle gathers rolling fingerprint |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410709861.7A CN104434130B (en) | 2014-11-27 | 2014-11-27 | Based on the method that electrochromism principle gathers rolling fingerprint |
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| CN104434130A true CN104434130A (en) | 2015-03-25 |
| CN104434130B CN104434130B (en) | 2017-03-15 |
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| CN201410709861.7A Expired - Fee Related CN104434130B (en) | 2014-11-27 | 2014-11-27 | Based on the method that electrochromism principle gathers rolling fingerprint |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105160307A (en) * | 2015-08-13 | 2015-12-16 | 江南大学 | Rolling fingerprint acquisition method based on thermochromic principle |
| CN105740852A (en) * | 2016-03-28 | 2016-07-06 | 南昌欧菲生物识别技术有限公司 | Fingerprint identification module and electronic device |
| CN108712884A (en) * | 2016-02-23 | 2018-10-26 | 日东电工株式会社 | Identification piece |
Citations (5)
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| JPS58166431A (en) * | 1982-03-26 | 1983-10-01 | Fujitsu Ltd | Finger touch type coordinate detection panel |
| US5282955A (en) * | 1991-06-19 | 1994-02-01 | Molecular Displays, Inc. | Electrically conductive polymer composition, method of making same and device incorporating same |
| CN1256773A (en) * | 1998-03-12 | 2000-06-14 | 卡西欧计算机株式会社 | Image reading apparatus |
| JP2003004918A (en) * | 2001-06-19 | 2003-01-08 | Omron Corp | Prism device for fingerprint collation and fingerprint collation device |
| KR100815515B1 (en) * | 2006-10-20 | 2008-03-20 | 주식회사보광화학 | A portable press powder for latent fingerprints and method for preparing the same |
-
2014
- 2014-11-27 CN CN201410709861.7A patent/CN104434130B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58166431A (en) * | 1982-03-26 | 1983-10-01 | Fujitsu Ltd | Finger touch type coordinate detection panel |
| US5282955A (en) * | 1991-06-19 | 1994-02-01 | Molecular Displays, Inc. | Electrically conductive polymer composition, method of making same and device incorporating same |
| CN1256773A (en) * | 1998-03-12 | 2000-06-14 | 卡西欧计算机株式会社 | Image reading apparatus |
| JP2003004918A (en) * | 2001-06-19 | 2003-01-08 | Omron Corp | Prism device for fingerprint collation and fingerprint collation device |
| KR100815515B1 (en) * | 2006-10-20 | 2008-03-20 | 주식회사보광화학 | A portable press powder for latent fingerprints and method for preparing the same |
Non-Patent Citations (2)
| Title |
|---|
| GANG QIN等: "Visualization of latent fingerprints using Prussian blue thin films", 《CHINESE CHEMICAL LETTERS》 * |
| J.J.GARCIA-JARENO 等: "Eletrochemical Behavior of Electrodeposited Prussian Blue Films on ITO Eletrodes", 《JOURNAL OF CHEMICAL EDUCATION》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105160307A (en) * | 2015-08-13 | 2015-12-16 | 江南大学 | Rolling fingerprint acquisition method based on thermochromic principle |
| CN108712884A (en) * | 2016-02-23 | 2018-10-26 | 日东电工株式会社 | Identification piece |
| CN105740852A (en) * | 2016-03-28 | 2016-07-06 | 南昌欧菲生物识别技术有限公司 | Fingerprint identification module and electronic device |
| CN105740852B (en) * | 2016-03-28 | 2022-04-05 | 江西欧迈斯微电子有限公司 | Fingerprint identification module and electronic device |
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| CN104434130B (en) | 2017-03-15 |
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