Optical system for biometric identification of a user

A method of identifying a user, comprising:

• detecting a portion of a user's finger in contact with a touch-sensitive region of a device;
• collecting data relating to a fingerprint of the user's finger for a period of time and obtaining a plurality of frames from the data, wherein the data comprises a ridge pattern of the fingerprint, a sweat gland pattern of the fingerprint, and dynamics of blood circulation in the user's finger;
• determining whether the user is an authorized user of the device, wherein the determining includes:
• verifying whether a portion of the ridge pattern matches a portion of a pre-stored reference ridge pattern;
• upon verifying the portion of the ridge pattern matches the portion of the pre-stored reference ridge pattern, verifying whether the sweat gland pattern matches a pre-stored reference sweat gland pattern;
• and
• upon verifying the sweat gland pattern matches the pre-stored reference sweat gland pattern, verifying from the plurality of frames whether blood is circulating in the finger;
• upon verifying blood is circulating in the finger, identifying the user as an authorized user.

A method of registering a user comprising:

• capturing a fingerprint of the user from the user's finger by detecting a touch input in which the portion of the user's finger is in contact with a touch-sensitive region of a device;
• collecting data relating to the fingerprint for a period of time and obtaining a plurality of frames from the data related to the fingerprint, wherein the data related to the fingerprint comprises a ridge pattern of the fingerprint, a sweat gland pattern of the fingerprint, and dynamics of blood circulation in the user's finger;
• storing the ridge pattern of the fingerprint as a pre-stored reference ridge pattern;
• storing the sweat gland pattern of the fingerprint as a pre-stored reference sweat gland pattern;
• registering the user as an authorized user and assigning the dynamics of blood circulation in the user's finger to the user.