| 摘要 |
<p>Between an image intensifier (II) having a circular radiation exit surface (II2) and an image sensor in the form of a solid state sensor (CTD) with a rectangular picture pick-up surface (PP) there is arranged an optical coupling system (OP) for producing an ellipsoidal picture (EL) of the circular radiation exit surface (II2) within or at least partly around the rectangular picture pick-up surface (PP). A signal correction device (GEN, CTD or PROC respectively) is provided for compensating the adaptation of the optical coupling system, whilst the sensor may form part of said device (GEN, CTD), said compensation being effected by adapting the clock pulse frequency so that the corrected picture signal produces the image in a circular surface (DIS) on a screen (MIS) of a picture display device (MON).</p> |
