| 摘要 |
<p>1,076,165. Television. ELECTRIC & MUSICAL INDUSTRIES Ltd. March 12, 1964 [March 12, 1963], No. 9661/63. Heading H4F. The invention relates to apparatus for storage images under low lighting condition of objects which are in motion with respect to the apparatus e.g. obtaining images of a scene from an aircraft. The apparatus comprises a television camera, Fig. 4, and a storage tube for storing the television picture information from the camera the scanning signals which are applied to the camera being applied to the storage tube after passing through scan transformation circuits, Fig. 5 (not shown), which allow for the movement of the scene relative to the aircraft during the integration time of the camera. The movement of the image applied to the storage tube is compensated with consequent increase in resolution for a given integration time or in integration time allowable for a given resolution, the storage tube storing as many pictures from the camera superimposed on one another as frames of the scan occur in the integration time. The Specification includes a mathematical analysis of the movement of the scene being photographed and the resulting equations which neutralize this movement are implemented by means of the scan transformation circuits, Fig. 5 (not shown), which modify the horizontal and vertical scanning signals applied to the storage tube. Although the scan transformation increases the period of integration, an upper limit to this period is set by the time objects take to cross the field of view. Instead of correcting the storage tube scan an inverse correction may be applied to the camera scan, or parts of the correction may be applied to both. Preferably the storage means includes a luminescent screen displaying the stored data and the operator has a light pencil to select where he wants maximum resolution of the image. The light pencil includes a phototransistor and is held at the point of interest of the luminescent screen so that it gates the co-ordinates at the time when the electron beam strikes the point of-interest of the screen.</p> |
