Automatic focus control for an image magnification system

Details Automatic focus control for an image magnification system Automatic focus control for an image magnification system

1988-06-21

1990-05-22

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358227, 358 93, H04N 718

Patent

active

049281704

ABSTRACT:
An automatic focus control system and related method of operation are provided for use in a closed circuit television system of the type designed for magnification of written images and the like, thereby permitting facilitated reading or viewing by persons with restricted vision. The focus control system responds to selected characteristics of a video signal to adjust the focus setting of a signal-producing video camera for substantially optimum image focus resolution. The focus control system operates initially in a scan mode to rapidly adjust the camera focus setting until the selected signal characteristics exceed a predetermined threshold, whereupon the system switches to a fine adjustment mode utilizing a sampling algorithm to achieve a substantially optimum focus setting.

REFERENCES:
patent: 3816646 (1974-06-01), Cinque
patent: 4115813 (1978-09-01), Mikami
patent: 4584204 (1986-04-01), Ferren
patent: 4616264 (1986-10-01), Pshtissky
patent: 4717959 (1989-01-01), Isago
patent: 4789898 (1988-12-01), Zwinn et al.
patent: 4841370 (1989-06-01), Murashima et al.

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