Apple has patented a new biometric authentication system for its watch that uses sensors and infrared LEDs shone through blood vessels. Uncovered by PatentlyApple, the concept envisions light emitters and light sensors being used to identify unique characteristics of the user's vasculature pressure levels – presumably the arrangement of blood vessels in the wrist.Light information can be obtained at one or more light sensors, and the information can be compared to stored information associated with a user identity.The volume of blood present in the skin can be a function of several factors, including the cyclical movement of blood to and from the skin and the particular physical characteristics of the vasculature of a user, among other possibilities.The tech could also be linked to motion information: “Motion information and light information may be received during a first time period. A gesture may be determined from the motion information. Then, the light information may be stored in association with the determined identifying gesture and an identity of a user of the electronic device. This stored light information may be used to later identify the user of the electronic device.”A gesture may be determined based on the motion information. PA notes that stored gesture information and/or one or more heuristics may be used to determine a gesture from the motion information. For example, “motion information may indicate that the user rapidly moved a hand from their waist to the side of their head, and such a motion can be recognized as a gesture. More specifically, the gesture may be recognized as a gesture associated with the identification process.”

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