Method of operating video cameras and lights underwater

Details Method of operating video cameras and lights underwater Method of operating video cameras and lights underwater

1975-07-10

1977-08-30

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 718

Patent

active

040458130

ABSTRACT:
Video cameras and illuminating lights on the helmets of commercial divers are caused to give satisfactory images in turbid water by a combination of camera adjustment and very low light levels. Lights of five to twenty-five watts total are employed with video cameras that have the sensitivity increased five to ten times normal and wherein the useful light range of the camera is adjusted to be three to five times the illumination from the lamps. It is desirable also to render the automatic gain control of the camera inoperative, at least over the lower part of that light range of the camera.

REFERENCES:
patent: 2987645 (1961-06-01), Hudgins
patent: 3102924 (1963-09-01), Legler
patent: 3315034 (1967-04-01), White
patent: 3437749 (1969-04-01), Klem
patent: 3495035 (1970-02-01), Ando
patent: 3919475 (1975-11-01), Dukich et al.
Fink, Television Engineering Handbook, McGraw-Hill, 1957, pp. 5-67; 5-70; 5-76.
Fink, Principles of television engineering, McGraw-Hill, 1940, p. 330.
Allanson, "Underwater Observation by Television," Journal of the SMPTE, vol. 65, pp. 311-319, June 1956.

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