Method of detecting eye component information for determining sight axis direction, and sight axis direction detection apparatus
Patent 5469234 Issued on November 21, 1995. Estimated Expiration Date: 
April 13, 2013. Estimated 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.
April 13, 2013. Estimated 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.Patent ReferencesEye movement detector Visual axis detection apparatus Patent #: 5280312 InventorAssigneeApplicationNo. 045194 filed on 04/13/1993US Classes:351/212, For cornea curvature measurement351/211, Including projected target image351/247For contact lens fittingExaminersPrimary: Sikes, William L.Assistant: Dang, Hung Xuan Attorney, Agent or FirmForeign Patent References
International ClassA61B 003/10Foreign Application Priority Data1992-04-14 JPAbstractIn 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. | |
