Infrared Imaging Face Recognition Using Nonlinear Kernel-Based Classifiers

摘要

In recent years there has been an increased interest in effective individual control and enhanced security measures, and face recognition schemes play an important role in this increasing market. In the past, most face recognition research studies have been conducted with visible imaging data. Only recently have IR imaging face recognition studies been reported for wide use applications, as uncooled IR imaging technology has improved to the point where the resolution of these much cheaper cameras closely approaches that of their cooled counterparts. This study is part of ongoing research conducted at the Naval Postgraduate School that investigates the feasibility of applying a low-cost, uncooled IR camera for face recognition applications. This specific study investigates whether nonlinear kernel-based classifiers may improve overall classification rates over those obtained with linear classification schemes. The study is applied to a 50-subject IR database developed inhouse with a low-resolution, uncooled IR camera. Results show best overall mean classification performances around 98.55%, which represents a 5% performance improvement over the best linear classifier results obtained previously on the same database. The study also considers several metrics to evaluate the impacts variations in various user-specified parameters have on the resulting classification performances. These results show that a low-cost, low-resolution IR camera combined with an efficient classifier can play an effective role in security-related applications.