NASA NTRS · 19860000116
TV Video-Level Controller
Abstract
Constant output maintained, though luminance varies by 5 million to 1. Three means of normalizing video output utilized in video-level controller: iris adjustment, tube voltage adjustment, and automatic gain control. With aid of automatic light control and gain control, television camera accommodates maximum light level 5 million times greater than lowest light level, while outputting constant 3-V peak signal to processing circuitry.
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Kravitz, M., Freedman, L. A., Fredd, E. H., Denef, D. E.. 1986-05-01. TV Video-Level Controller. https://ntrs.nasa.gov/citations/19860000116
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