Auto focus system and auto focus method
US8373789B2 · kind B2 · utility
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1References
7Claims
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Key dates
| Filing date | Feb 18, 2010 |
| Grant date | Feb 12, 2013 |
| Priority date | — |
| Expiry date | Jan 1, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/84
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An auto focus method for passive auto focus systems consists of an image acquisition and processing engine, as well as an acutance index calculation engine. An auto focus method measures image's acutance index rather than image's contrast value. A passive auto focus system employing the auto focus method of the present invention can accurately and reliably detect the best focus point and thus preventing auto focus malfunction even under the condition that illumination uniformity changes dramatically.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.