Patent ID: 6362852
Filing Date: 2002-03-26
Classification: H04N

Abstract:
A focus control apparatus having an imaging means for imaging an object through a focus lens to output an electric signal corresponding to said object, said focus control apparatus comprising;extracting means for extracting a high-frequency component of the electric signal output from said imaging means; estimation value generating means for generating an estimation value indicative of a focus state of said object based on said high-frequency component output from said extracting means; storage means for storing a number of sets of estimation values a number of focus lens positions in which each set has a plurality of estimation values and in which the estimation values of each respective set have the same focus lens position; selecting means for selecting a set of estimation values from the number of sets of said estimation values stored in said storage means such that the selected plurality of estimation values at the same focus lens position have a difference therebetween less than one of a predetermined value and a predetermined percentage of one of the estimation values; and control means for calculating a just focus position based on the plurality of estimation values selected by said selecting means and the lens position or positions corresponding to said plurality of selected estimation values.