Method of and apparatus for automatically controlling exposure
US5184172A · kind A · utility
18Cited by
7References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 2, 1991 |
| Grant date | Feb 2, 1993 |
| Priority date | — |
| Expiry date | Oct 2, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/71
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an automatic exposure (AE) controlling method and apparatus according to the invention, a picturing area or a view is divided into a plurality of zones of which the central one is usually used for iris adjustment with the largest weight. The central zone is automatically expanded or reduced in the upper, lower, right-hand or left-hand direction(s) in accordance with differences in average luminance between the central zone and a respective one of the surrounding zones.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.