| 摘要 |
<p>A stroboscope-lamp, via a half-transparant mirror (2), illuminates the gutter (3) of a lid (4), in which filling compound (5) has been applied. On places where this filling mass or compound (5) is absent, the reflection of the light by the bottom of the gutter will be substantially stronger than in case of filling compound (5) being present. A video-camera (6) senses the gutter (5) by means of reflection through the half-transparant mirror (2). If gutter (3) is in accordance with the standard filled with filling compound (5), the video-camera (6) senses a dark annular gutter. Regions with lacking filling compound can be sensed as bright spots in this ring, which can readily be detected by means of existing techniques for processing pictures. The reflection direction of the light is dependent on the angular position of the reflecting surface. Since the reflection of light directly emanating from lamp (1) from the inner side of gutter (3) is directed in a direction outside the angle of view of the camera, there no lacking filling compound will be detected. By illuminating said surface from an other direction by means of a cylindrical mirror (7) the mentioned area, in this case of lacking of filling compound (5), will also reflect light in the direction of camera (6).</p> |
