Correlated auto-focus stabilization method and digital camera
US7428375B2 · kind B2 · utility
3Cited by
1References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 22, 2005 |
| Grant date | Sep 23, 2008 |
| Priority date | — |
| Expiry date | Feb 2, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/676
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Auto-focus in a digital camera is improved by stabilizing successive images. Each auto-focus image is correlated to previous images so that scene movement or motion can be tracked. The area in the scene where focus figure-of-merit is computed is adjusted according to the amount of scene movement. Also, two separate focus frames may be compared to determine the direction and speed of the motion. This improves the accuracy of the focus figure-of-merit which results in fewer autofocus failures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.