Auto-focusing method
US4561747A · kind A · utility
13Cited by
3References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1984 |
| Grant date | Dec 31, 1985 |
| Priority date | — |
| Expiry date | Jun 14, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/40
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.