METHOD AND DEVICE FOR DETECTING LOW-CONTRAST AND HIGH-CONTRAST DEFECTS IN TRANSPARENT OR TRANSLUCENT OBJECTS

摘要

The method involves driving a light source (3) e.g. organic LED, by using a driving unit (9) such that the light source successively produces two types of light, where one type of light being homogeneous light, and other type of light is formed of dark zones and clear zones alternated with a discontinuous spatial variation. An image of a transparent or translucent object (2) is captured in moving when the object is lighted successively by the types of light. The image captured with the types of light is analyzed to respectively detect high contrast defects and low contrast defects. An independent claim is also included for a device for inspecting a transparent or translucent object.