Processing of image intensifier data

Details Processing of image intensifier data Processing of image intensifier data

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spie.3164..524z&link_type=abstract

Proc. SPIE Vol. 3164, p. 524-534, Applications of Digital Image Processing XX, Andrew G. Tescher; Ed.

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Image intensifiers on board UVSTAR, the Ultraviolet Spectrograph Telescope for Astronomical Research, did not seem to be functioning as expected. Therefore, a simplified version of the UVSTAR electronics was used to test the image intensifiers in the laboratory. All photosensitive locations of he intensifier array were exposed at once, and then each line read each sequentially. The images which were produced had an annoying intensity gradient superimposed on them. This gradient is due to the fact that line n of the intensifier array was corrupted by thermal signal n times longer than line 1. The imagery was further degraded by the presence of so-called 'hot-pixels'. These pixels correspond to locations on the intensifier's charge coupled device array which over react to the photon flux and produce abnormally high intensity readings. This paper descries image processing techniques which removed the gradient as well as hot pixels from the intensifier imagery so that an accurate performance assessment could be made. The methods describe can also be used to diagnose flaws in medical and industrial image intensifiers in general.

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