Method for time synchronization of information measured by...

G - Physics – 01 – N

Patent

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Details

G01N 21/86 (2006.01) G01N 21/89 (2006.01) G06T 7/00 (2006.01) G06T 7/20 (2006.01)

Patent

CA 2480073

The invention relates to a method for synchronizing information produced by imaging optical measuring devices (1-N) which monitor the manufacturing and/or finishing process of a fibre web, in relation to the move~ment of the fibre web in the machine direction, which method comprises the steps of monitoring the moving fibre web and/or a moving means involved in its proc~essing in the machine direction by means of imaging measuring devices (1-N) placed in successive measur~ing positions in the machine direction, and searching the information recorded by imaging at different measuring positions, for images, or the like, relating to the same local area of the fibre web, for their analysis and/or stor~age. In the method according to the invention, the images, or the like, recorded in the different measuring positions, are searched, by digital pattern recognition, for a feature / features (30) relating to the same local area of the fibre web, and the travel time delays of the fibre web between the different measuring positions are determined on the basis of time data included in said feature/features (30) upon the recording of images, or the like, in the different measuring positions. The inven~tion makes it possible to automatically synchronize information measured by imaging in a significantly more accurate and adaptive way than in prior art.

L'invention concerne un procédé de synchronisation d'informations produites par des dispositifs de mesure optique à imagerie (1-N) qui surveillent le processus de fabrication et/ou de finition d'une nappe fibreuse, par rapport au mouvement d'une nappe fibreuse dans le sens machine. Ledit procédé consiste à surveiller le mouvement de la nappe fibreuse et/ou un moyen de mouvement impliqué dans le traitement dans le sens machine au moyen de dispositifs de mesure à imagerie (1-N) placés en des points de mesure successifs dans le sens machine, et à rechercher parmi les informations enregistrées par imagerie en différents points de mesure, des images ou similaire relatives à la même zone locale de la nappe, pour leur analyse et/ou leur stockage. Dans le procédé de l'invention, une ou plusieurs caractéristiques (30) relatives à la même zone locale de la nappe est/sont recherchées par reconnaissance des formes numériques, dans les images ou similaire, enregistrées en différents points de mesure, et les retards de déplacement de la nappe entre les différents points de mesure sont déterminés en fonction de données temporelles comprises dans la/les caractéristiques (30) lors de l'enregistrement des images ou similaire, au niveau des différents points de mesure. Le procédé de l'invention permet la synchronisation automatique d'informations mesurées par imagerie de manière sensiblement plus précise et adaptative que dans la technique antérieure.

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