Method for determining the scale of an observation area

Details Method for determining the scale of an observation area Method for determining the scale of an observation area

G - Physics

01

N

G01N 21/89 (2006.01)

Patent

CA 2481674

The invention relates to a method in the control of the quality or the condition of a fibre web (21) on the basis of optical imaging diagnostics, wherein the fibre web (21) under examination and/or means (22, 23) relating to the processing of the fibre web are monitored with at least one optical imaging measuring device (1 to N). According to the method, the scale of the observation area of said at least one imaging measuring device (1 to N) is calibrated, when said measuring device is taken into use, by means of one or more calibration objects placed in the observation area of the measuring device, to correct the perspective error caused by the position between said measuring device and the object (21, 22, 23) observed by it.

L'invention concerne un procédé permettant de réguler la qualité ou l'état d'un voile fibreux (21) à partir de diagnostics d'imagerie optique. Le voile fibreux (21) examiné et/ou les moyens (22, 23) associés au traitement dudit voile sont contrôlés à l'aide d'au moins un dispositif de mesure par imagerie optique (1 à N). Selon le procédé décrit dans cette invention, l'échelle de la zone d'observation dudit dispositif de mesure par imagerie optique (1 à N) est étalonnée, lorsque le dispositif de mesure fonctionne, à l'aide d'un ou de plusieurs objets d'étalonnage disposés dans la zone d'observation du dispositif de mesure, de manière à corriger l'erreur de perspective provoquée par la position entre le dispositif de mesure et l'objet (21, 22, 23) observé par celui-ci.

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