Auto-focusing method
Patent 4561747 Issued on December 31, 1985. Estimated Expiration Date: 
June 14, 2004. 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.
June 14, 2004. 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 ReferencesMethod and system for detecting sharpness of an object image Focus condition detecting device Method and apparatus for determining focus direction and amount Patent #: 4333007 InventorsAssigneeApplicationNo. 06/620707 filed on 06/14/1984US Classes:396/101With electronic filteringExaminersPrimary: Adams, Russell E.Attorney, Agent or FirmInternational ClassesG02B 7/30 (20060101)G02B 27/40 (20060101) Foreign Application Priority Data1983-06-30 JPAbstractAn auto-focusing method includes a scanning step for scanning a pair of solid-state image sensors on which light from a subject of interest impinges as passing through a focusing lens, an A/D conversion step, a Fourier transformation step, a convolution operation step, a peak detection step for determining an amount of displacement of said lens from the results of said convolution, and a lens displacement step for displacing said lens according to the displacement amount thus determined. The present auto-focusing method is least susceptible to noises and not adversely affected by differences in contrast of the subject of interest. | |
