Automatic focus controlling device

Details Automatic focus controlling device Automatic focus controlling device

1981-03-18

1983-05-10

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

352140, 354195, 355 56, H04N 326

Patent

active

043832741

ABSTRACT:
In an automatic focus controlling device, a bilinear type CCD is driven in synchronization with pixell clock pulses having a predetermined frequency to generate time series electric signals corresponding to brightness of an image formed thereon. The time series electric signals are caused to pass through a low-pass filter and a band-stop filter. The low-pass filter cuts off signal components having a frequency higher than the predetermined frequency of the pixell clock pulses, and the band-stop filter cuts off components of the signals having a frequency near the half of the frequency of the pixell clock pulses. Contrast signals free from noises are obtained by differentiating the signals having passed through the filters, and focus is controlled based on the contrast signals.

REFERENCES:
patent: 3211831 (1965-10-01), Steiner
patent: 3538334 (1970-11-01), Shaffer, Jr.
patent: 4101837 (1978-07-01), Clayton, Jr.
patent: 4300826 (1981-11-01), Aoki et al.
patent: 4320417 (1982-03-01), Hamma

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