SPATIAL FILTRATION OF IMAGES ON THE IMAGE-ORTHICON TARGET,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
Pagination or Media Count:
Three methods of spatial filtration of image-orthicon pictures are considered 1 two independently produced images - a high-definition positive and a blurred negative - are algebraically combined on the storing target of the orthicon. An additional grid in the image-transfer section is introduced. Such a spatial-frequency filter can be adjusted by varying the potentials of electrodes and the exposure time 2 by selecting the potential of the target irradiated by slow electrons, a compensation of relatively uniform background noise suppression of lower spatial frequencies can be achieved. An additional 1-f filtration can be obtained, in the process of readout, by applying a negative feedback from the video-amplifier output - via a 1-f filter - to the target grid. Such a method may find application in astronomic TV 3 a modification of the preceding method permits obtaining a two-side restriction of electronic images. The target potential can be reduced as soon as the storage has been completed. As this operation is performed on the target before the image readout, only the desirable picture not noise is accentuated.
- Non-Radio Communications