Focus detection using an image signal extracted before digital signal processing
US5861917A · kind A · utility
15Cited by
8References
31Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 5, 1995 |
| Grant date | Jan 19, 1999 |
| Priority date | — |
| Expiry date | Sep 5, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/69
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an image pickup apparatus having an electronic zooming function for enlarging and interpolating an image by electronic image processing of an image pickup signal output from an image pickup device, a focus is detected by extracting a predetermined focal signal varying depending upon a focal state from the image pickup signal before the image pickup signal undergoes enlargement/interpolation processing by electronic zooming.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.