Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1982-04-09
1985-01-22
Masinick, Michael A.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358217, 358174, 358161, H04N 514
Patent
active
044955200
ABSTRACT:
A video level control system 10 is provided which generates a normalized video signal for a camera processing circuit. The video level control system 10 includes a lens iris 12 which provides a controlled light signal to a camera tube 14. The camera tube 14 converts the light signal provided by the lens iris 12 into electrical signals. A feedback circuit 22 in response to the electrical signals generated by the camera tube 14, provides feedback signals to the lens iris 12 and the camera tube. This assures that a normalized video signal is provided in a first illumination range. An automatic gain control loop 50, which is also responsive to the electrical signals generated by the camera tube 14, operates in tandem with the feedback circuit 22. This assures that the normalized video signal is maintained in a second illumination range.
REFERENCES:
patent: 3691302 (1972-09-01), Gaebele et al.
patent: 4050085 (1977-09-01), Prince et al.
Denef Dan E.
Fredd Elmer H.
Freedman Larry A.
Kravitz Marvin
Manning John R.
Masinick Michael A.
Matthews Marvin F.
The United States of America as represented by the Administrator
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