Tracking objects on a touch surface
US9927920B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2016 |
| Grant date | Mar 27, 2018 |
| Priority date | — |
| Expiry date | May 14, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04109
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A device implements a method of tracking objects on a touch surface of an FTIR based touch-sensitive apparatus. An interaction map is generated that indicates local changes in interaction on the touch surface. The interaction map is processed for identification of positive and negative peaks that represent a locally increased and decreased interaction in the interaction map, respectively. To suppress the impact of interferences, a dedicated first heuristic and/or second heuristic is applied to identify potentially false peaks among the positive peaks. The first heuristic designates a positive peak as a potentially false peak when the positive peak is deemed to be associated with one or more of the negative peaks. The second heuristic designates a positive peak as a potentially false peak when the positive peak is deemed to be located along one of the movement trajectories. Movement trajectories of all objects deemed to exist on the touch surface at a preceding time point are then updated while taking the potentially false peaks into account.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.