A method and device for measuring the characteristic...

G - Physics – 01 – B

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G01B 11/03 (2006.01) G01B 11/04 (2006.01) G01B 11/245 (2006.01) H04N 7/18 (2006.01)

Patent

CA 2219023

The object of the invention is a method and apparatus for measuring the characteritic quantities, such as e.g., the length, diameter, volume, and defects, of a log (1) or similar, in which method the log (1) is moved at a known speed past a photographing station. The photographing station consists of at least one plane of light (4.1) that transects the direction of travel of the log and a video camera (3) set at a fixed angle (a) to this, and a computer apparatus (6), which is arranged to calculate and collect sequential images of a group of surface points (x1, y1, z1; ...; xN, yN, zN) of a three- dimensional model depicting the surface of the log as the log moves through the plane of light, in which the coordinates of each point are calculated with the aid of the geometry of the photography. The log (1) is transported transversely to the direction of the conveyor, the log then travelling along an imagined plane, while the plane of light (4.1) is arranged to intersect the imagined plane of movement of the log at a right-angle. A subgroup of points (yn (x1, z1; ...; xL, zL)) of the cross section is interpolated at regular intervals in the longitudinal direction of the log from the group of points (x1, y1, z1; ...; xN, yN, zN), and the radius (yN; rn) of the circle describing the cross section and the location of the centre-point (yn; xn; zn) are calculated from each subgroup obtained, and calculatory sequential elements, for example cylinders (c1...cM), from which the desired quantities are calculated, are formed with the aid of the circles obtained.

Cette invention porte sur un procédé et un dispositif de mesure d'éléments caractéristiques d'une bille (1) de bois ou analogue, tels que par exemple la longueur, le diamètre, le volume et les défauts de celle-ci, procédé dans lequel on fait passer la bille (1) à une vitesse connue devant un poste de prises de vue photographiques. Ce poste comprend au moins un plan de lumière (4.1) coupant le sens de déplacement de la bille, une caméra vidéo (3) placée selon un angle (a) fixe par rapport à ce plan, ainsi qu'un ordinateur (6), conçu pour calculer et recueillir des images séquentielles d'un groupe de points (x¿1?, y¿1?, z¿1?; ...; x¿N?, y¿N?, z¿N?) de surface d'un modèle tridimensionnel représentant la surface de la bille au moment où celle-ci se déplace dans le plan de lumière, les coordonnées de chaque point étant calculées à l'aide de la géométrie de la photographie. On transporte la bille (1) de manière transversale par rapport au sens de déplacement du dispositif de transport, la bille avançant le long d'un plan imaginé, tandis que le plan de la lumière (4.1) est conçu pour couper à angle droit le plan imaginé de déplacement de la bille. On interpole un sous groupe de points (y¿n? (x¿1?, z¿1?; ...; x¿L?, z¿L?)) de la section, au niveau d'intervalles réguliers sur la longueur de la bille, à partir du groupe de points (x¿1?, y¿1?, z¿1?; ...; x¿N?, y¿N?, z¿N?), et on calcule le rayon (y¿n?; r¿n?) du cercle circonscrivant la section de la bille, ainsi que l'emplacement du point central (y¿n?; x¿n?; z¿n?), à partir de chaque sous groupe obtenu, et on forme des éléments séquentiels de calcul, par exemple des cylindres (c¿1?...c¿M?), à partir desquels on calcule les grandeurs souhaitées, à l'aide des cercles obtenus.

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