Patent ID: 9551671
Date: 2017-01-24
CPC Classifications: G01N

Claim:
1. A method of an in-line method of optically inspecting transparent or translucent containers ( 3 ) traveling along a determined path F 1 at a high rate between a light source ( 7 ) and an image-taking system ( 9 ) for taking images of the containers and for analyzing the images taken, in order to determine as a characteristic of the container ( 3 ) at least the presence of a defect that refracts light or the quality with which the material constituting the container is distributed, the method being characterized by the following steps: illuminating each container ( for each container ( between taking successive images, creating a relative shift between the container and the periodic pattern in a variation direction (D) of the periodic pattern ( determining and applying a geometrical transformation in at least N−1 images of the same container for at least a set of points belonging to the container in order to put the pixels belonging to the container in the N successive images of the same container into coincidence; for each container ( analyzing the phase image in order to deduce therefrom, as a characteristic of the container (