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An aircraft having vertical takeoff and landing capability provided with at least first and second laterally extending paddle wheels rotatable on a central axis perpendicular to the longitudinal axis of the aircraft fuselage and between its nose and tail.
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US Patent 5652641 - Method of detecting eye component information for determining sight axis direction, and sight axis direction detection apparatus
US Patent Issued on July 29, 1997
Estimated Patent Expiration Date:
April 28, 2015Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
April 28, 2015Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractIn a pupil center detection method and a pupil ring portion detection method, which can obtain a pupil center and a pupil ring portion necessary for calculating a sight axis of an eyeball from specific points on the basis of a light beam reflected by the eyeball, when the position of the pupil center of the eyeball is detected by utilizing an image based on a light beam radiated from a projection device onto the eyeball and reflected by the eyeball, a large number of pupil ring portion positions are obtained, an average value and a standard deviation of the large number of pupil ring portion positions are obtained, and the pupil center is detected using values within a range defined by the average value and the standard deviation. | InventorAssigneeApplicationNo. 431293 filed on 04/28/1995US Classes:351/246, Methods of use351/205Objective typeField of Search351/208, Having means to detect proper distance or alignment (i.e., eye to instrument)351/205, Objective type351/211, Including projected target image351/212, For cornea curvature measurement351/221, Including illuminator351/247, For contact lens fitting351/246, Methods of use384/406, Ring type250/222.1Inanimate articleExaminersPrimary: Dang, Hung XuanAttorney, Agent or FirmUS Patent References4836670, Eye movement detectorIssued on: 06/06/1989 Inventor: Hutchinson5280312, Visual axis detection apparatus Issued on: 01/18/1994 Inventor: Yamada, et al.5298927, Visual axis detecor having a high sensitivity to a light from an eye Issued on: 03/29/1994 Inventor: Konishi, et al.5302819, Method of, and apparatus for, detecting an object Issued on: 04/12/1994 Inventor: Kassies5469234Method of detecting eye component information for determining sight axis direction, and sight axis direction detection apparatus Issued on: 11/21/1995 Inventor: Konishi Foreign Patent References
International ClassA61P 003/00Foreign Application Priority Data1992-04-14 JP |
