Method for the measurement of the optical quality of a glass plate

The method uses a projector (1) with a diaphragm which constitutes a light source 92) that illuminates a windscreen (3) to be tested. The screen is placed at a considerable distance, e.g. four meters, from the source and at an angle relative to the light beam direction. A CCD camera (6) monitors the...

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Bibliographic Details
Main Authors FLORENTIN, JEAN-MICHEL, GAYOUT, PATRICK, PICHON, MICHEL, GUERING, PAUL-HENRI
Format Patent
LanguageEnglish
French
German
Published 06.12.1995
Edition6
Subjects
CALCULATING
COMPUTING
COUNTING
IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PERFORMING OPERATIONS
PHYSICS
REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FORVEHICLES
TESTING
TRANSPORTING
VEHICLES IN GENERAL
WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILARDEVICES FOR VEHICLES
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Summary:The method uses a projector (1) with a diaphragm which constitutes a light source 92) that illuminates a windscreen (3) to be tested. The screen is placed at a considerable distance, e.g. four meters, from the source and at an angle relative to the light beam direction. A CCD camera (6) monitors the shadow cast by the windscreen. The image generated is then stored in the camera memory and used to generate a reference image. The recorded image is compared with its reference image so that a defect map is produced.
Bibliography:Application Number: EP19950401171