Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1983-04-04
1985-09-17
Masinick, Michael A.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358225, 358228, H04N 9535
Patent
active
045424039
ABSTRACT:
Before the camera is used to transmit a scene, a key or button (21) is actuated which causes a measurement field generator (23) to define a small portion of the picture field, where the video signal level of the greatest of the three color components will be compared with a reference level in an aperture control circuit (6) for setting the camera lens aperture. If this should result in a lens aperture above an upper limit or below a lower limit, an amplification step control (26) for an amplifier (8) is shifted one step so as to bring the lens aperture between the aforesaid limits. The comparison of the video signal level with the reference level is repeated until the amplification is sufficient to bring the lens aperture into the desired range. The measurement field is shown in the camera finder (14) and likewise any off-limits setting of the lens aperture and whether the manual control (28) is on a setting that permits the automatic amplification control to operate.
REFERENCES:
patent: 4312014 (1982-01-01), Ryan
patent: 4368484 (1983-01-01), Stemme
Sacher Christian
Zappen Hans W.
Zettl Herbert
Zimmermann Friedrich
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