Adaptive interest rate control for visual search
US9600744B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 2013 |
| Grant date | Mar 21, 2017 |
| Priority date | — |
| Expiry date | Aug 5, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/247
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Image-processing apparatus and methods to adaptively vary an interest point threshold value and control a number of interest points identified in an image frame are described. Sub-regions of an image frame may be processed in a sequence, and an interest point threshold value calculated for each sub-region. The calculated value of the interest point threshold may depend upon pre-selected values and values determined from the processing of one or more prior sub-regions. By using adaptive thresholding, a number of interest points detected for each frame in a sequence of image frames may remain substantially constant, even though objects within the frames may vary appreciably.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.