System for focusing a television camera objective lens

Details System for focusing a television camera objective lens System for focusing a television camera objective lens

1990-10-26

1993-06-08

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

354402, H04N 5232

Patent

active

052184455

ABSTRACT:
A system for focusing a zoom lens objective of a color television camera. A luminance or green video signal derived from a portion of the picture is full-wave rectified and then averaged. The sharpest focus corresponds to the highest value of that average. The signal is converted to digital form and processed by a microcomputer for automatic focusing control by finding the signal maximum with shifting of the lens focus setting. The video signal is stripped of its d.c. component before rectification, but is used with its full bandwidth.

REFERENCES:
patent: 4638364 (1987-01-01), Hiramatsu
patent: 4695893 (1987-09-01), Makino et al.
patent: 4804831 (1989-02-01), Baba et al.
patent: 4967279 (1990-10-01), Murashima
patent: 4975726 (1990-12-01), Kuga et al.
"The Computer as a Camera-Operation and Image-Quality Manager", by Frederik J. van Roessel and Engbert Tienkamp, pp. 1079-1086.

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