Camera having a focus controller capable of focusing in horizont

Details Camera having a focus controller capable of focusing in horizont Camera having a focus controller capable of focusing in horizont

1989-06-15

1991-01-15

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 5232

Patent

active

049857770

ABSTRACT:
In a focus control apparatus of a camera, a luminance signal component having a relatively high frequency is extracted from a video signal by use of a filter so as to accumulate the extracted luminance signal component by an accumulator. A difference circuit computes a difference in the accumulated signal component between two adjacent horizontal scanning lines such that the maximum value of the difference is held by an accumulator unit for a vertical scanning period. The focus of the lens is controlled such that the accumulated value produced by the accumulator unit takes the maximum value. A high focusing accuracy is obtained not only for an image in which the luminance greatly varies in the horizontal direction of the image having a vertical stripe pattern but also for an image associated with a large change only in the vertical direction having an image of vertical stripes.

REFERENCES:
patent: 4599653 (1986-07-01), Kimura et al.
patent: 4680639 (1987-07-01), Isono et al.
patent: 4739395 (1988-04-01), Johanndeiter et al.

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