Method and device for hyperacute detection of an essentially rectilinear contrast edge and system for fine following and fixing of said contrast edge
US7667859B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 2005 |
| Grant date | Feb 23, 2010 |
| Priority date | — |
| Expiry date | Jan 8, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B11/028
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Method and device for the detection of an essentially rectilinear contrast edge (E) in a direction, whereby a periodic sweep (Ω) of global visual angle (Δψ) of the optical sensors, by translation (S) in another direction transverse to the first direction, is carried out. The translation provides a periodic sweep of non-uniform angular speed (ψ) during a part of the period of sweeping and a measurement of a time difference (t) from the signals provided by the sensors (D1, D2), depending on the angular position of the contrast edge (E) with relation to a reference direction (OY12) within the global visual angle (Δψ) from the sweep law (Ω), the reference direction being connected to a specific value for the time difference (t). The above is of application to spatial stabilization of a sight line and the fine following and fixing of an object with at least one contrast edge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.