Auto focus system
US7561790B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 27, 2005 |
| Grant date | Jul 14, 2009 |
| Priority date | — |
| Expiry date | Jul 18, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/673
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides an auto focus system capable of having an AF area which is a target range of auto focus (AF) automatically follow a follow-up target subject as a focusing target, wherein the system changes a size of a range for capturing an image of the follow-up target subject as a reference pattern image out of the range of a photographing image according to a target subject distance and a focal length of a photographing lens so as to appropriately perform detection of the image of the target subject and automatic follow-up of the AF area even in the case where the size of the image of the target subject in the photographing image of the camera changes such as the case where the distance between the camera and the follow-up target subject changes or the case where the focal length of the photographing lens (optical system of the camera) changes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.