Thesis Details
Detekce živosti prstu na základě změn papilárních linií
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 4,5ľm, the distance between two neighbor papillary lines in 0,454ľm. 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.
papillary lines, liveness detection, expandability of the skin, optical fingerprint sensor, frauds against biometric systems, optical lens parameters for capturing fingerprints.
@mastersthesis{FITMT6341,
author = "Michal Lichv\'{a}r",
type = "Master's thesis",
title = "Detekce \v{z}ivosti prstu na z\'{a}klad\v{e} zm\v{e}n papil\'{a}rn\'{i}ch lini\'{i}",
school = "Brno University of Technology, Faculty of Information Technology",
year = 2008,
location = "Brno, CZ",
language = "czech",
url = "https://www.fit.vut.cz/study/thesis/6341/"
}