Auto-focusing system and method
US9426351B2 · kind B2 · utility
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3References
18Claims
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Key dates
| Filing date | Nov 20, 2014 |
| Grant date | Aug 23, 2016 |
| Priority date | — |
| Expiry date | Feb 19, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/431
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An auto-focusing method includes dividing an image into a plurality of blocks, performing discrete cosine transform (DCT) on image data of the plurality of blocks to output a plurality of DCT blocks each comprising DCT coefficients, generating a DCT mask for selecting DCT coefficients corresponding to a selected frequency range in a DCT block among the plurality of DCT blocks, and calculating a focus value of the image by applying the generated DCT mask to the DCT block.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.