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US 5,694,479 AGranted
Process for measuring the optical quality of a glass product
AssigneeSaint-Gobain Vitrage
InventorsPaul-Henri Guering, Patrick Gayout, Jean-Michel Florentin, Michel Pichon
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Abstract
For evaluating the optical quality of a glass product utilizing a projection technique, a camera and a computer, the image observed is compared with a reference image reconstructed by means of a convolution window which is displaced over the entire projected image. The illumination at the boundaries is reconstructed by an extrapolation by two-dimensional linear regression.
Claims7
A process for measuring the optical quality of a glass product, comprising the steps of:
- illuminating the glass product using a localized light source to produce an ombroscopic image;
- recording the ombroscopic image on a video camera;
- processing point measurements of the illumination of the recorded image to reconstruct an estimated illumination in impossible or prohibited regions of the recorded image corresponding to obscured and peripheral regions of the glass product;
- displacing a convolution window over the processed image;
- using a two dimensional convolution filter to replace each point of the processed image with a weighted illumination at the center of the convolution window to produce a reference image corresponding to a glass product free from defects;
- and
- comparing the illumination of each point of the recorded image with corresponding points of the reference image to determine a defect in the glass product.
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Dependencies are inferred from the claim text.