Automatic focusing device having a settable focus detection area

Details Automatic focusing device having a settable focus detection area Automatic focusing device having a settable focus detection area

1990-12-26

1992-07-07

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Recording apparatus

358125, H04N 5225

Patent

active

051287684

ABSTRACT:
An automatic focusing device for automatically controlling the focused state of an optical system on the basis of a video signal obtained within a focus detecting area which is set on an image sensing plane comprises: a tracing area setting circuit arranged to movably set, within said image sensing plane, an inner tracing area and an outer tracing area which surrounds the inner tracing area; a computing circuit arranged to compute information on a difference in a given frequency component of the video signal obtained from the inner and outer tracing areas in each of their different positions to which they are moved within the image sensing plane; determining means for determining the position or size of an object's image formed within the range sensing plane from the difference information computed by the computing circuit; and a circuit which is arranged to shift the focus detecting area to the position of the object's image determined by the determining circuit and to change the size of the focus detecting area according to the size of the object's image.

REFERENCES:
patent: 4409661 (1983-10-01), Romanski
patent: 4644397 (1987-02-01), Roy et al.
patent: 4710782 (1987-10-01), Duvent
patent: 4794459 (1988-12-01), Moberg et al.
patent: 4796187 (1989-01-01), North
"NHK Gijutsu Kenkyu Hokoku" 1965, vol. 17 No. 1, (Whole No. 16) pp. 21-37.

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