Method for detecting sub-pixel motion for optical navigation device
US7502515B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 2004 |
| Grant date | Mar 10, 2009 |
| Priority date | — |
| Expiry date | May 31, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/7515
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for detecting sub-pixel motion for an optical navigation device is disclosed. The method calculates the displacement of the sub-pixel motion according to brightness curve equations of captured images, which is represented by positional coordinates x and y. The detection method includes capturing a first image frame and a second image frame at different times, selecting plural pixels from the first image frame as calculation reference pixels, generating brightness curve equations of the reference pixels, calculating partial-derivatives of the reference pixel to generate a plurality of two-dimensional first-order equations, and calculating the sub-pixel motion according to the plurality of the two-dimensional first-order equations. The method can reduce the pixel noise by choosing reliable pixels as the reference pixels. The method also reduce the noise by classifying the reference pixels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.