A biometric recognition system is essentially a pat- tern recognition system that ensures personal identification by determining the authenticity of a specific physiological or behavioral characteristic that is possessed by the subject. It is an emerging field of technology, which consists of three main modules: the sensor module, the feature-extraction module, and the feature-matching module. Recent advancements in digital and optical technologies, biometric sensors, and matching algorithms have led to the deployment of biometric recognition systems in a variety of security applications.
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