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 Title: |
US6659611:
System and method for eye gaze tracking using corneal image mapping
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Amir, Arnon; Saratoga, CA
Flickner, Myron Dale; San Jose, CA
Koons, David Bruce; San Jose, CA
Morimoto, Carlos Hitoshi; Sao Paulo, Brazil
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| Assignee: |
International Business Machines Corporation, Armonk, NY
other patents from INTERNATIONAL BUSINESS MACHINES CORPORATION (280070) (approx. 44,393)
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| Published / Filed: |
2003-12-09
/ 2001-12-28
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| Application Number: |
US2001000034524
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| IPC Code: |
Advanced:
A61B 3/113;
Core:
more...
IPC-7:
A61B 3/14;
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| ECLA Code: |
A61B3/113;
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| U.S. Class: |
351/210;
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| Field of Search: |
351/209,210,208,200,205,206,211,221
382/103,291
708/141
702/151
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| Priority Number: |
| 2001-12-28 |
US2001000034524 |
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| Abstract: |
A system and method for eye gaze tracking without calibrated cameras, direct measurements of specific users' eye geometries, or requiring the user to visually track a cursor traversing a known trajectory. The preferred embodiment includes two uncalibrated cameras imaging the user's eye and haying on-axis lighting. The cameras capture images of a test pattern in real space as reflected from the user's cornea, which is essentially a convex spherical mirror. The invention then extracts parameters required to define a mathematical mapping between real space and image space, including spherical and perspective transformations. The invention processes subsequent images of objects reflected from the user's eye through the inverse of the mathematical mapping to determine a gaze vector and a point of regard. Alternately, a single calibrated camera may be employed with means for estimating the eye-to-camera distance. A head-mounted embodiment that may include a laser pointer is also described.
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| Attorney, Agent or Firm: |
McSwain, Marc D. ;
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| Primary / Asst. Examiners: |
Manuel, George;
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Parent Case: |
CROSS-REFERENCE TO RELATED APPLICATIONS
This patent application is related to U.S. Ser. No. 09/844,682 "Calibration-Free Eye Gaze Tracking", a commonly-owned patent application filed on Apr. 27, 2001, which is hereby incorporated by reference. This patent application is also related to U.S. Ser. No. 09/238,979 "Method and Apparatus for Associating Pupils with Subjects", a commonly-owned patent application filed on Jan. 27, 1999, which is hereby incorporated by reference.
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| Family: |
Show 2 known family members
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First Claim:
Show all 15 claims |
We claim:
1. A method for eye gaze tracking, comprising the steps of:
- creating a set of reference points in a reference coordinate system;
- acquiring at least one image of at least one of a user's corneas, said image having image aspects in an image coordinate system and including reflections of said reference points;
- defining a mathematical relationship between said reference coordinate system and said image coordinate system;
- mapping said image aspects from said image coordinate system to said reference coordinate system using said mathematical relationship; and
- computing a point of regard from said mapped image aspects.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 7 U.S. patent(s) that reference this one
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| Foreign References: |
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| Other References: |
K. Talmi and J. Liu, "Eye and Gaze Tracking for Visually Controlled Interactive Stereoscopic Displays", Image Communication, vol. 14, No. 10, p. 799-810, 1999.
(12 pages)
Cited by 4 patents
[ISI abstract]
S. Shih, Y. Wu, J. Liu, "A Calibration-Free Gaze Tracking Technique", ICPR 2000, vol. 4, pp. 201-204, 2000.
J. Liu et al., "Three-dimensional PC: toward novel forms of human-computer interaction", in Three-Dimensional Video and Display: Devices and Systems SPIE CR76, Nov. 5-8, 2000, Boston, MA, USA.
Z. Zhang, "A Flexible New Technique for Camera Calibration", IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. 22, No. 11, p1330-1334, 2000, also available as Technical Report MSR-TR-98-71, Microsoft Research, Microsoft Corporation, Redmond WA, http://research.microsoft.com/~ zhang/Papers/TR98-71.pdf.
P. J. Kennedy, "Point of Regard Tracking Device", IBM Technical Disclosure Bulletin vol. 34, No. 10A, Mar. 1992.
Eye Movement Equipment Database (EMED), University of Darby, http://ibs.derby.ac.uk/emed.
Arnon Amir et al., "Calibration-Free Eye Gaze Tracking", U.S. Ser. No. 09/844,682.
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