Automatic focusing apparatus for a video camera
US6271883A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1997 |
| Grant date | Aug 7, 2001 |
| Priority date | — |
| Expiry date | Nov 20, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/673
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is disclosed an integrated circuit for focus control, which is obtained by integrating, on a single chip, a filter circuit for extracting a predetermined signal component, which changes in accordance with a focusing state, from an image pickup signal, a gate circuit for extracting a focus signal, corresponding to a portion in a focus detection region in a photographing frame, from a focus signal extracted by the filter circuit, an arithmetic circuit for generating an evaluation signal of the focusing state by performing predetermined signal processing for the focus signal extracted by the gate circuit and corresponding to the portion in the focus detection region, a region setting circuit for controlling the positions or the number of focus detection regions in the photographing field by controlling the gate circuit, and an interface for connecting the respective circuits to an external circuit, and allowing the circuits to be controlled by a command from the control circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.