Patent ID: 11893098
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 15:
16. A method of authenticating a user of a computing device, the method comprising:
displaying a first text to the user,
acquiring, from a camera operatively connected to the computing device, a video sequence of the user subvocalizing at least part of the first text,
magnifying, by video processing the acquired video sequence, motions of one or more body parts of the user, which motions are correlated with the subvocalized at least part of the first text, and
deriving a representation of the user subvocalizing at least part of the first text as a representation of the magnified motions from the video processing of the acquired video sequence,
deriving a user phrasing signature by identifying a sequence of durations of pauses in the derived representation of the magnified motions from the video processing of the acquired video sequence, and
authenticating the user in response to determining that the user phrasing signature and a reference phrasing signature fulfil a similarity condition, wherein the reference phrasing signature is derived from a previously acquired video sequence from the camera or another camera of the user subvocalizing the at least part of the first text.