Auto-focusing method

Details Auto-focusing method Auto-focusing method

1984-06-14

1985-12-31

Adams, Russell E.

354408, G03B 300

Patent

active

045617473

ABSTRACT:
An 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.

REFERENCES:
patent: 4133606 (1979-01-01), Hosoe et al.
patent: 4253752 (1981-03-01), Ichihara
patent: 4333007 (1982-06-01), Langlais et al.

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