Representing image patches for matching
US8737737B1 · kind B1 · utility
24Cited by
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14Claims
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Key dates
| Filing date | Mar 23, 2012 |
| Grant date | May 27, 2014 |
| Priority date | — |
| Expiry date | Dec 5, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/50
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Processes such as image matching can be improved by utilizing a Polar Accumulated Signed Gradient (PASG), a feature descriptor vector that utilizes polar coordinates. Such an approach is efficient because it avoids the costly image rotation and resampling of conventional processes. Further, the gradients can be sampled over different regions in order to achieve effective weighting without analyzing all gradients and applying a weighting factor. Such efficiencies enable image matching to be performed on devices with limited computing capacity, such as smart phones and tablet computers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.