Television cameras

Details Television cameras Television cameras

1985-09-24

1987-02-24

Griffin, Donald A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358108, 358211, H04N 909, H04N 718, H04N 538

Patent

active

046461400

ABSTRACT:
Television cameras using solid-state image sensors may be required to provide a good image of a scene under all normal night and day ambient light conditions. The available solid-state image sensors can cope satisfactorily with normal daylight, but do not have sufficient sensitivity to operate under night time conditions, so it is common to amplify the incident illumination with an image intensifier. To stop the intensifier from becoming overloaded by daylight, neutral density optical filters can be moved in front of the intensifier as the light level increases, but this is not a satisfactory solution. The invention proposes a camera incorporating two solid-state sensors, one of which is intensified and one of which is not, in the same camera head, and "switching" one or the other into operation (depending upon the ambient lighting conditions) by switching the light received by the camera to the appropriate sensor.

REFERENCES:
patent: 3653747 (1972-04-01), Kogelnik
patent: 3891795 (1975-06-01), Johnson et al.
patent: 3975760 (1976-08-01), Yamanaka et al.
RCA Technical Notes, Jun. 1959, No. 268, Image Intensifier, Morton et al.

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