Proceedings of the International Conference
I W S S I P   2005
12th INTERNATIONAL WORKSHOP ON SYSTEMS, SIGNALS & IMAGE PROCESSING

22 - 24 September 2005, Chalkida Greece
 
(from Chapter 1: Invited Addresses and Tutorials on Signals, Coding, Systems and Intelligent Techniques)

 Full Citation and Abstract

0 Title: On the line width influence in directional field determination for fingerprint images
  Author(s): Flavio Maggessi Viola, Sanderson L. de Oliveira Gonzaga, Aura Conci
  Address: Computer Institute, Federal Fluminense University, Niterói, RJ, Brazil
fviola @ if.uff.br, sgonzaga @ if.uff.br, aconci @ if.uff.br
  Reference: SSIP-SP1, 2005  pp. 313 - 316
  Abstract/
Summary
Determination of directional field is part of several image processes. In this work, this issue is related with automatic fingerprint identification systems especially in the initial steps. Definition of an accurate and concise model for directional fields improves the performance on estimating the fingerprint ridge and valley orientation. This work presents results of a current research in automatic fingerprint identification system. Text focuses the creation of directional field matrix from fingerprint images. The aim of the process is the location of singular points in fingerprint images with an original technique to smooth the directional image obtained. Experimental tests reveal that the line width is quite relevant in choosing which mask size should be used. Firstly, the system verifies the average width of ridges and valleys in fingerprints to consider whether the process use a mask with 9x9 or 17x17 pixels of size, identifying 8 possible angles for the directional field determination. In spite of the width ridge process evaluation, when creating the directional image, the technique is not time-consuming and tests perform very well both in terms of efficiency and robustness.
 
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