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Biometrics systems work by recording and comparing biometric characteristics. In many cases, characteristics are recorded as images, but for speaker recognition a waveform is recorded, and for signature recognition, time series data. For efficiency reasons, rather than using recorded characteristics directly, it is usual to extract identifying features from the samples and encode these features in a form that facilitates storage and comparison.
When an individual first uses a biometric system, their identifying features are enrolled as a reference for future comparison. This reference may be stored in a central database or on a card (or both) depending on the needs of the application.