Patent ID: 8417959

Claim:
A method of identifying a user comprising: illuminating a user with first electromagnetic energy having a first wavelength provided by an excitation source to induce luminescence, wherein a portion of said first electromagnetic energy is absorbed and emitted from the user at a different wavelength; illuminating said user with a second electromagnetic energy provided by said excitation source; detecting said luminescence with a detector and producing a first output; detecting a portion of said second electromagnetic energy reflected by said user and forming a second output; identifying a first reference corresponding to said luminescence of a selected user stored in memory; identifying a second reference corresponding to said selected user's response to said second electromagnetic energy stored in memory; comparing by a processor said first reference to said first output; comparing by said processor said second reference to said second output; identifying whether a selected user is present; and adjusting said first and second reference stored in memory based on changes over time in said luminescence and said second electromagnetic energy reflected by said user wherein said changes correspond to changes in said user's biometric information regarding a physical feature of said user.