Extração de características biométricas da íris humana.

Abstract

In this work some of the most widely knwon techniques for automatic iris recognition are described, with special focus on the processing steps proposed by John Daugman, pioneer of the field. Particular attention was given to the investigation of the effects of the supression of the noise masks during the comparison of 2 iris codes and to the development of a method for the construction of the application points matrix with the purpose of reducing the negative effects caused by occlusions of the iris by eyelashes and eyelids, as well as by segmentation errors when the noise masks are not taken into account. It was verified that the proposed method for the selection of the application points performend better than expected, presenting results superior to those of the traditional method, obtained with the use of noise masks and application points uniformely distributed. Therefore, it follows that, from a judicious choice of the application points matrix, it is possible to supress the noise mask of the process of comparison of iris codes without significant loss of performance.