US 2020/0026068 A1Published application

Determining eye openness with an eye tracking device

AssigneeTobii AB

InventorsMark Ryan, Torbjörn Sundberg, Pravin Rana, Yimu Wang

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Abstract

A method for determining eye openness with an eye tracking device is disclosed. The method may include determining, for pixels of an image sensor of an eye tracking device, during a first time period when an eye of a user is open, a first sum of intensity of the pixels. The method may also include determining, during a second time period when the eye of the user is closed, a second sum of intensity of the pixels. The method may further include determining, during a third time period, a third sum of intensity of the pixels. The method may additionally include determining that upon the third sum exceeding a fourth sum of the first sum plus a threshold amount, that the eye of the user is closed, the threshold amount is equal to a product of a threshold fraction and a difference between the first sum and the second sum.

Claims1

Dependent claims

A method for determining eye openness with an eye tracking device, wherein the method comprises:

determining, for at least a portion of pixels of an image sensor of an eye tracking device, a baseline value based on a first sum of intensity of the pixels for a first time period when an eye of a user is open;
determining, for the at least portion of pixels of the image sensor of the eye tracking device, a blink amplitude value based on a second sum of intensity of the pixels for a second time period when the eye of the user is closed, wherein a sum of intensity of the pixels when the eye of the user is closed is higher than a sum of intensity of the pixels when the eye of the user is open;
determining, for the at least portion of pixels of the image sensor of the eye tracking device, during a third time period, a third sum of intensity of the pixels;
determining a threshold value based on the baseline value and the blink amplitude value;
and
determining, with a processor, based upon the third sum exceeding the threshold value, that the eye of the user is closed.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/449,828Filed 24 Jun 2019
Priority: 27 Feb 2017
Published: 23 Jan 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification21 codes

A61B 5/0077
Using light, e.g. diagnosis by transillumination, diascopy, fluorescence: devices for viewing the surface of the body, e.g. camera, magnifying lens
G02B 26/0875
For controlling the direction of light: by means of one or more refracting elements
A61B 3/112
For measuring interpupillary distance or diameter of pupils: for measuring diameter of pupils
A61B 3/113
Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions: for determining or recording eye…

Family

Application62/464,235Us provisional application · filed 27 Feb 2017
Application15/893,340Continuation · filed 9 Feb 2018
Application16/449,828Continuation
US 10,394,019 B2Related patent
US 10,852,531 B2Related patent
US 2018/0247119 A1Published application
US 2020/0026068 A1This patent

From the US filing history. Foreign family members aren’t listed.