Detekce živosti prstu na základě změn papilárních linií
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Mark
D
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Vysoké učení technické v Brně. Fakulta informačních technologií
Abstract
Existuje mnoho spôsobov podvodov proti biometrickým systémom (BS) a niekoľko techník na zabezpečenie BS proti týmto podvodom. Jednou z nich je detekcia živosti. Na oklamanie senzorov otlačkov prstov sa používajú latentné otlačky, gummené napodobeniny prstov a tenké fólie pripevnené k povrchu prstu. Počas skenovania otlačku prstu sa tiež využíva detekcia živosti. Používajú sa rôzne vlastnosti živého prstu, napr. pot, elektrická vodivosť, atď. V tejto diplomovej práci je skúmaný nový prístup k rozpoznávaniu živosti. Je založený na rozťažnosti prstu ako dôsledku úderov srdca/pulzu. Ako sa koža rozťahuje, zväčšujú sa aj vzdialenosti papilárnych línií. Celý prst expanduje približne o 4,5µm, dve susedné papilárne línie o 0,454µm. Táto hodnota koliduje s vlnovou dĺžkou modrého a zeleného svetla. Výsledok práce je nasledovný. Rozlíšenie snímacieho zariadenia nie je dostatočné na zachytenie rozťažnosti medzi dvoma susednými papilárnymi líniami. Taktiež, z dôvodu kolízie s vlnovou dĺžkou viditelného svetla sa prejavuju difrakčný efekt a výsledok je ovplyvnený touto chybou.
There are several frauds against biometric systems (BSs) and several techniques exist to secure BSs against these frauds. One of the techniques is liveness detection. To fool fingerprint sensors, latent fingerprints, dummy fingers and wafer-thin layer attached to the finger are being used. Liveness detection is being used also when scanning fingerprints. Several different characteristics of the live finger can be used to detect liveness, for example sweat, conductivity etc. In this thesis, new approach is examined. It is based on the expandability of the finger as an effect of heartbeats/pulsation. As the skin is expanding, also the distances between papillary lines are expanding. Whole finger expands approximately in range of 4,5 ľm , the distance between two neighbor papillary lines in 0,454 ľm . This value collides with wavelength of blue and green light. The result from this work is following. The resolution of the capturing device is not high enough to capture the expandability on distance between two neighbor papillary lines. Also, because of collision with wavelength, the diffraction effect is presented and the result images are influenced by this error.
There are several frauds against biometric systems (BSs) and several techniques exist to secure BSs against these frauds. One of the techniques is liveness detection. To fool fingerprint sensors, latent fingerprints, dummy fingers and wafer-thin layer attached to the finger are being used. Liveness detection is being used also when scanning fingerprints. Several different characteristics of the live finger can be used to detect liveness, for example sweat, conductivity etc. In this thesis, new approach is examined. It is based on the expandability of the finger as an effect of heartbeats/pulsation. As the skin is expanding, also the distances between papillary lines are expanding. Whole finger expands approximately in range of 4,5 ľm , the distance between two neighbor papillary lines in 0,454 ľm . This value collides with wavelength of blue and green light. The result from this work is following. The resolution of the capturing device is not high enough to capture the expandability on distance between two neighbor papillary lines. Also, because of collision with wavelength, the diffraction effect is presented and the result images are influenced by this error.
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Keywords
papilárne línie, detekcia živosti, rozťažnosť kože, optický senzor otlačkov prstov, podvody proti biometrickým systémom, parametre optickej sústavy pri snímaní otlačkov prstov, papillary lines, liveness detection, expandability of the skin, optical fingerprint sensor, frauds against biometric systems, optical lens parameters for capturing fingerprints.
Citation
LICHVÁR, M. Detekce živosti prstu na základě změn papilárních linií [online]. Brno: Vysoké učení technické v Brně. Fakulta informačních technologií. 2008.
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cs
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Počítačová grafika a multimédia
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2008-06-16
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práce byla úspěšně obhájena
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Standardní licenční smlouva - přístup k plnému textu bez omezení