Method and apparatus for determining relative movement in an optical mouse
US7042439B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 6, 2001 |
| Grant date | May 9, 2006 |
| Priority date | — |
| Expiry date | May 9, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T7/223
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method of determining a movement vector between two images is disclosed. The two images are sequentially taken by an optical mouse. The method comprises first calculating a directional correlation value for a plurality of directional shifts between the first image and the second image. The minimum directional correlation value is chosen and compared to a threshold value. If the minimum directional correlation value calculated is less than the threshold, identifying a movement vector associated with the minimum directional correlation value. However, if the minimum directional correlation value is not less than the threshold, the first and second images are compressed and the calculations are redone. The compression continues until a qualifying movement vector is identified.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.