Automatically focusing system and focusing method therefor
US6710806B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 17, 2000 |
| Grant date | Mar 23, 2004 |
| Priority date | — |
| Expiry date | Oct 2, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/6153
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An automatically focusing system comprises a distance-direction calculating section for calculating defocusing characteristic information of the picture image data in the respective AF areas of the black and white image sensors, which have been disposed in such that light receiving distances differ from one another in every respective colors to estimate a distance up to a focusing point as well as a direction along the same on the basis of the defocusing characteristic information of the respective colors, and a driving device for focal point adjustment for judging whether or not a situation is in a focusing condition based on the distance up to the focusing point and shifting the focus lens by the distance up to the focusing point along the direction in the focusing point estimated in the case when it was judged that a situation was not in a focusing condition, whereby a high-speed focusing operation can be achieved with a simple structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.