US 11,893,098 B2
Authenticating a user subvocalizing a displayed text
Matthew John Lawrenson, Bussigny (CH); Lars Andersson, Solna (SE); Till Burkert, Huddinge (SE); Harm Stefan Cronie, Echallens (CH); Jacob Ström, Stockholm (SE); and Jan Jasper Van Den Berg, Lausanne (CH)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Filed on Aug. 30, 2021, as Appl. No. 17/460,778.
Application 17/460,778 is a continuation of application No. 16/466,464, granted, now 11,132,429, previously published as PCT/EP2016/080950, filed on Dec. 14, 2016.
Prior Publication US 2021/0390167 A1, Dec. 16, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 21/00 (2013.01); G06F 21/32 (2013.01); G06F 21/31 (2013.01); H04W 12/065 (2021.01)
CPC G06F 21/32 (2013.01) [G06F 21/316 (2013.01); H04W 12/065 (2021.01)] 32 Claims
OG exemplary drawing
 
1. A computing device for authenticating a user of the computing device, the computing device comprising processing circuitry configured to:
display a first text to the user,
acquire, from a camera operatively connected to the computing device, a video sequence of the user subvocalizing at least part of the first text,
magnify, 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
derive 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,
derive 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
authenticate 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.