1. A biometric authentication system comprising: a biometric image sensor configured to sense biometric characteristics of an object; determination circuitry configured to perform analysis of a partial scan of the object without accessing previously stored biometric enrollment data; and wake on event logic cooperating with at least one of the biometric image sensor and a host electronic device, wherein the wake on event logic is configured to complete a wake on event power-up or power-on sequence for at least one of the biometric image sensor and the host electronic device in response to a positive outcome of the analysis.