Patents by Inventor Bengt Rehnstrom
Bengt Rehnstrom has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20190302882Abstract: A visual display includes hidden reference illuminators adapted to emit invisible light for generating corneo-scleral reflections on an eye watching a screen surface of the display. The tracking of such reflections and the pupil center provides input to gaze tracking. A method for equipping and an LCD with a reference illuminator are also provided. Also provides are a system and method for determining a gaze point of an eye watching a visual display that includes reference illuminators. The determination of the gaze point may be based on an ellipsoidal cornea model.Type: ApplicationFiled: December 21, 2018Publication date: October 3, 2019Applicant: Tobii ABInventors: Peter Blixt, Anders Kingback, Bengt Rehnstrom, John Elvesjö, Mattias Kuldkepp
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Patent number: 10191542Abstract: A visual display includes hidden reference illuminators adapted to emit invisible light for generating corneo-scleral reflections on an eye watching a screen surface of the display. The tracking of such reflections and the pupil center provides input to gaze tracking. A method for equipping and an LCD with a reference illuminator are also provided. Also provides are a system and method for determining a gaze point of an eye watching a visual display that includes reference illuminators. The determination of the gaze point may be based on an ellipsoidal cornea model.Type: GrantFiled: April 10, 2017Date of Patent: January 29, 2019Assignee: Tobii ABInventors: Peter Blixt, Anders Kingback, Bengt Rehnstrom, John Elvesjö, Mattias Kuldkepp
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Publication number: 20170220107Abstract: A visual display includes hidden reference illuminators adapted to emit invisible light for generating corneo-scleral reflections on an eye watching a screen surface of the display. The tracking of such reflections and the pupil center provides input to gaze tracking. A method for equipping and an LCD with a reference illuminator are also provided. Also provides are a system and method for determining a gaze point of an eye watching a visual display that includes reference illuminators. The determination of the gaze point may be based on an ellipsoidal cornea model.Type: ApplicationFiled: April 10, 2017Publication date: August 3, 2017Inventors: Peter Blixt, Anders Kingback, Bengt Rehnstrom, John Elvesjö, Mattias Kuldkepp
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Patent number: 9632180Abstract: A visual display includes hidden reference illuminators adapted to emit invisible light for generating corneo-scleral reflections on an eye watching a screen surface of the display. The tracking of such reflections and the pupil center provides input to gaze tracking. A method for equipping and an LCD with a reference illuminator are also provided. Also provides are a system and method for determining a gaze point of an eye watching a visual display that includes reference illuminators. The determination of the gaze point may be based on an ellipsoidal cornea model.Type: GrantFiled: January 25, 2016Date of Patent: April 25, 2017Assignee: TOBII ABInventors: Peter Blixt, Anders Kingback, Bengt Rehnstrom, John Elvesjö, Mattias Kuldkepp
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Publication number: 20160139268Abstract: A visual display includes hidden reference illuminators adapted to emit invisible light for generating corneo-scleral reflections on an eye watching a screen surface of the display. The tracking of such reflections and the pupil center provides input to gaze tracking. A method for equipping and an LCD with a reference illuminator are also provided. Also provides are a system and method for determining a gaze point of an eye watching a visual display that includes reference illuminators. The determination of the gaze point may be based on an ellipsoidal cornea model.Type: ApplicationFiled: January 25, 2016Publication date: May 19, 2016Inventors: PETER BLIXT, ANDERS KINGBACK, Bengt REHNSTROM, JOHN ELVESJÖ, Mattias Kuldkepp
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Patent number: 9244170Abstract: A visual display includes hidden reference illuminators adapted to emit invisible light for generating corneo-scleral reflections on an eye watching a screen surface of the display. The tracking of such reflections and the pupil center provides input to gaze tracking. A method for equipping and an LCD with a reference illuminator are also provided. Also provides are a system and method for determining a gaze point of an eye watching a visual display that includes reference illuminators. The determination of the gaze point may be based on an ellipsoidal cornea model.Type: GrantFiled: September 18, 2013Date of Patent: January 26, 2016Assignee: Tobii Technology ABInventors: Peter Blixt, Anders Hoglund, Bengt Rehnstrom, John Elvesjö, Mattias Kuldkepp
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Patent number: 9194952Abstract: A visual display includes hidden reference illuminators adapted to emit invisible light for generating corneo-scleral reflections on an eye watching a screen surface of the display. The tracking of such reflections and the pupil center provides input to gaze tracking. A method for equipping and an LCD with a reference illuminator are also provided. Also provides are a system and method for determining a gaze point of an eye watching a visual display that includes reference illuminators. The determination of the gaze point may be based on an ellipsoidal cornea model.Type: GrantFiled: December 30, 2014Date of Patent: November 24, 2015Assignee: TOBII ABInventors: Peter Blixt, Bengt Rehnström, Anders Kingbäck, John Mikael Elvesjö, Mattias Kuldkepp
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Publication number: 20140062868Abstract: A visual display includes hidden reference illuminators adapted to emit invisible light for generating corneo-scleral reflections on an eye watching a screen surface of the display. The tracking of such reflections and the pupil center provides input to gaze tracking. A method for equipping and an LCD with a reference illuminator are also provided. Also provides are a system and method for determining a gaze point of an eye watching a visual display that includes reference illuminators. The determination of the gaze point may be based on an ellipsoidal cornea model.Type: ApplicationFiled: September 18, 2013Publication date: March 6, 2014Applicant: Tobii Technology ABInventors: PETER BLIXT, Anders Hoglund, Bengt Rehnstrom, John Elvesjö, Mattias Kuldkepp
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Patent number: 8562136Abstract: A visual display characterized by hidden reference illuminators is adapted to emit invisible light for generating corneo-scleral reflections on an eye watching a screen surface of the display. The tracking of such reflections and the pupil center provides input for gaze tracking. A method for equipping and an LCD with a reference illuminator are also provided. A system and method for determining a gaze point of an eye watching a visual display comprising reference illuminators are further provided. The determination of the gaze point may be based on an ellipsoidal cornea model.Type: GrantFiled: May 7, 2012Date of Patent: October 22, 2013Assignee: Tobii Technology ABInventors: Peter Blixt, Anders Hoglund, Bengt Rehnstrom, John Elvesjö
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Patent number: 8220926Abstract: A visual display characterized by hidden reference illuminators is adapted to emit invisible light for generating corneo-scleral reflections on an eye watching a screen surface of the display. The tracking of such reflections and the pupil center provides input for gaze tracking. A method for equipping and an LCD with a reference illuminator are also provided. A system and method for determining a gaze point of an eye watching a visual display comprising reference illuminators are further provided. The determination of the gaze point may be based on an ellipsoidal cornea model.Type: GrantFiled: March 31, 2010Date of Patent: July 17, 2012Assignee: Tobii Technology ABInventors: Peter Blixt, Anders Hoglund, Bengt Rehnstrom, John Elvesjö
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Patent number: 8066375Abstract: The present invention relates to automatic registration and tracking of the eyes of at least one subject. An optical system, including a lens structure, a mask and an image sensor, receives incoming light from a scene containing the subject and directs at least a portion of this light towards the image sensor, which registers spatially distributed light and thus produces primary data. The mask is to alter a basic optical transfer function of the lens structure and the image sensor into an enhanced optical transfer function, which is substantially less sensitive to variations of an unknown distance between the optical system and the subject than the basic optical transfer function. The processing unit is to receive the primary data and process this data to produce resulting eye-tracking data representing a position estimate of the at least one eye and/or a gaze direction for the at least one eye.Type: GrantFiled: August 28, 2006Date of Patent: November 29, 2011Assignee: Tobii Technology ABInventors: Mårten Skogö, John Elvesjö, Bengt Rehnström
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Patent number: 8025405Abstract: The invention relates to automatic eye tracking, wherein at least one imaging device (150) registers sequential image data (DEYE) representing at least one eye (181; 182) of a subject (180). A processing unit (170) receives the image data (DEYE), and based thereon, produces a position estimate of the at least one eye (181; 182). The processing unit (170) also produces a control signal (DILL)>which is received by at least one light source (140). The at least one light source (140), in turn, emits at least one light beam (L) being variable, such that a spatial location of an illumination area (AILL) towards which at least one light beam (L) is directed depends on the characteristics of the control signal (CILL). Specifically, the processing unit (170) produces the control signal (CILL) so that the illumination area (AILL) includes a position estimate of the at least one eye (181; 182).Type: GrantFiled: November 29, 2007Date of Patent: September 27, 2011Assignee: Tobil Technology ABInventor: Bengt Rehnstrom
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Publication number: 20110069277Abstract: A visual display characterized by hidden reference illuminators is adapted to emit invisible light for generating corneo-scleral reflections on an eye watching a screen surface of the display. The tracking of such reflections and the pupil center provides input for gaze tracking. A method for equipping and an LCD with a reference illuminator are also provided. A system and method for determining a gaze point of an eye watching a visual display comprising reference illuminators are further provided. The determination of the gaze point may be based on an ellipsoidal cornea model.Type: ApplicationFiled: March 31, 2010Publication date: March 24, 2011Applicant: Tobii Technology ABInventors: Peter BLIXT, Anders Hoglund, Bengt Rehnstrom, John Elvesjö
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Publication number: 20100066975Abstract: The invention relates to automatic eye tracking, wherein at least one imaging device (150) registers sequential image data (DEYE) representing at least one eye (181; 182) of a subject (180). A processing unit (170) receives the image data (DEYE), and based thereon, produces a position estimate of the at least one eye (181; 182). The processing unit (170) also produces a control signal (DILL)>which is received by at least one light source (140). The at least one light source (140), in turn, emits at least one light beam (L) being variable, such that a spatial location of an illumination area (AILL) towards which at least one light beam (L) is directed depends on the characteristics of the control signal (CILL). Specifically, the processing unit (170) produces the control signal (CILL) so that the illumination area (AILL) includes a position estimate of the at least one eye (181; 182).Type: ApplicationFiled: November 29, 2007Publication date: March 18, 2010Inventor: Bengt Rehnstrom
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Publication number: 20080284980Abstract: The present invention relates to automatic registration and tracking of the eyes of at least one subject. An optical system, including a lens structure, a mask and an image sensor, receives incoming light from a scene containing the subject and directs at least a portion of this light towards the image sensor, which registers spatially distributed light and thus produces primary data. The mask is adapted to alter a basic optical transfer function of the lens structure and the image sensor into an enhanced optical transfer function, which is substantially less sensitive to variations of an unknown distance between the optical system and the subject than the basic optical transfer function. The processing unit is adapted to receive the primary data and process this data to produce resulting eye-tracking data representing a position estimate of the at least one eye and/or a gaze direction for the at least one eye.Type: ApplicationFiled: August 28, 2006Publication date: November 20, 2008Applicant: Tobii Technology ABInventors: Marten Skogo, John Elvesjo, Bengt Rehnstrom