Patent US5614967A successfully refreshed from Google Patents.
US5614967A
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Eye movement analysis system
Assignee: Nihon Kohden Corp
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Filing: 1996-03-29
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Granted: 1997-03-25
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Expires: 2016-03-29
Abstract
Abstract An eye movement analysis system illuminates the surface of each eye, and calculates the movement of the eye from the image of the eye including the pupil and iris striation. The eye movement analysis system is made up of an image signal processor including a controller which calculates the movement of the eye as well as the respective positions of the center of the eye and the iris striation from the image of the eye and a RAM which holds the respective positions of the center of the eye and the iris striation, a display which displays the iris striation in different states before and after the positional analysis, and an operating section which stops changing the frame if the currently displayed iris striation is different from the previously specified iris striation.
Inventors
- 👤 Norio Ishikawa
- 👤 Hidehiro Hosaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:14
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/14; A61B3/145; A61B3/113
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
165 words
An eye movement analysis system which analyzes movement of each of eyes on the basis of a position of the center of a pupil and a position of at least one iris striation, both being included in a recorded image of the eye, the system comprising: image signal processing means provided with control means which calculates the respective positions of the pupil and the iris striation by tracking the pupil and iris striation that are specified on the eye image every time a frame of the image is fed, and storage means which holds the thus calculated respective positions of the center of the eye and the iris striation; display means which displays the iris striation located at the calculated position and the iris striation before being subjected to the calculation in different manners; and operating means for stopping feeding the frame of the image if the iris striation displayed after the calculation is different from the iris striation before being subjected to the calculation.
Claim 2
Dependent Claim
165 words
An eye movement analysis system which analyzes movement of each of eyes on the basis of a position of the center of a pupil and a position of at least one iris striation, both being included in a recorded image of the eye, the system comprising: image signal processing means provided with control means which calculates the respective positions of the pupil and the iris striation by tracking the pupil and iris striation that are specified on the eye image every time a frame of the image is fed, and storage means which holds the thus calculated respective positions of the center of the eye and the iris striation; display means which displays the iris striation located at the calculated position and the iris striation before being subjected to the calculation in different manners; and operating means for stopping feeding the frame of the image if the iris striation displayed after the calculation is different from the iris striation before being subjected to the calculation.
Claim 3
Dependent Claim
38 words
An eye movement analysis system as claimed in claim 1, wherein the display means displays the iris striation that has been subjected to the calculation and the iris striation before being subjected to the calculation in different colors.
Claim 4
Dependent Claim
25 words
An eye movement analysis system as claimed in claim 1, wherein the display means blinks the iris striation that has been subjected to the calculation.
References Cited (Backward Citations)
US5196873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-03-24 | 2000-09-23 | 2001-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-03-24 | 2004-09-23 | 2005-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-03-24 | 2008-09-23 | 2009-03-25 | $7700.00 | Window Closed / Lapsed |