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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Main Authors | , , , |
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Format | Patent |
Language | English French German |
Published |
06.12.1995
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Edition | 6 |
Subjects | |
Online Access | Get full text |
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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. |
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Bibliography: | Application Number: EP19950401171 |