Method for using flash to assist in focal length detection
US8436934B2 · kind B2 · utility
1Cited by
4References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 21, 2010 |
| Grant date | May 7, 2013 |
| Priority date | — |
| Expiry date | Jul 1, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B13/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for assisting in focal length detection is applicable to a digital camera having the flash. The method includes the following steps. First, the flash of the digital camera is actuated and a first image is captured. Afterwards, a characteristic exposure value of the first image is calculated. A focus range comparison table is looked up according to the characteristic exposure value to obtain an initial focus position. Then, a focus procedure is performed according to the initial focus position to obtain a target focal length.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.