Focus condition detecting device having correlation calculation means and means for determining the range of shifts of image signals
US4734571A · kind A · utility
25Cited by
7References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1986 |
| Grant date | Mar 29, 1988 |
| Priority date | — |
| Expiry date | Oct 30, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/34
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
There is disclosed a focus condition detecting device for a camera. The focus condition detecting device has a preliminary correlation calculation means for calculating correlations between first and second image signals with a relatively low accuracy and a principal correlation calculation means for calculating correlations between first and second image signals with a relatively high accuracy on the basis of data obtained in the preliminary correlation calculation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.