The impact of sensor ageing related pixel defects on the
performance of finger vein based recognition systems in
terms of the EER (Equal Error Rate) is investigated. Therefore
the defect growth rate per year for the sensor used
to capture the data set was estimated. Based on this estimation
an experimental study using several simulations
with increasing numbers of stuck and hot pixels were done
to determine the impact on different finger-vein matching
schemes. Whereas for a reasonable number of pixel defects
none of the methods is considerably influenced, the
performance of several schemes drops if the number of defects
is increased. The impact can be reduced using a simple
denoising filter.
1. Introduction