Method and device for hyperacute detection of an essentially...

Details Method and device for hyperacute detection of an essentially... Method and device for hyperacute detection of an essentially...

G - Physics

01

B

G01B 11/02 (2006.01) B25J 9/16 (2006.01)

Patent

CA 2563584

The invention relates to a method and a device for the detection of an essentially rectilinear contrast edge (E) in a direction, whereby a periodic sweep (.OMEGA.) of the global visual angle (.DELTA..psi.) of the optical sensors (D1, D2), by translation (S) in another direction transverse to the first direction, is carried out. Said translation provides a periodic sweep of non-uniform angular speed (.OMEGA.) 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 (.DELTA..psi.) from the sweep law (.OMEGA.), said reference direction being connected to a specific value for the time difference (t). The above is of application to spatial stabilisation of a sight line and the fine following and fixing of an object with at least one contrast edge.

L'invention concerne un procédé et un dispositif de détection d'un bord contrasté (E) sensiblement rectiligne dans une direction selon lesquels on effectue dans une autre direction transversale ô cette direction un balayage périodique ( ) de l'angle de vision global ( ) de capteurs optiques (D1, D2) par translation (S) dans cette autre direction, cette translation entraînant un balayage périodique de vitesse angulaire ( ) non uniforme pendant une partie de la période de balayage et on mesure ô partir des signaux délivrés par les capteurs (D1, D2) un écart temporel (?t) qui dépend de la position angulaire du bord contrasté (E) par rapport ô une direction de référence (OY12) de l'angle de vision global ( ) ô partir de la loi de balayage ( ), cette direction de référence étant liée ô une valeur spécifique de l'écart temporel (?t). Application ô la stabilisation spatiale d'une ligne de visée et ô la fixation et ô la poursuite fine d'un objet présentant au moins un bord contrasté.

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