Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-04-18
1992-05-19
Adams, Russell E.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358227, G02B 728, H04N 5232, G03B 1336
Patent
active
051152622
ABSTRACT:
An auto-focusing apparatus includes a CCD for imaging an optical image formed by a photographing optical system, a motor for changing the position of the CCD along the direction of the optical axis, a BPF for extracting a predetermined frequency component from an image signal read from the CCD, a detector for outputting a focus signal corresponding to a focusing degree by performing square detection of an output signal from the BPF, and a microprocessor for calculating an intermediate parameter dFZP on the basis of the frequency band of the BPF and the F-number of the photographing optical system, determining a sampling interval .DELTA.x on the basis of a characteristic value COPT of the detector and the intermediate parameter d.sub.FZP, controlling the motor and the CCD in accordance with the sampling interval, sampling a plurality of focus signals, and detecting an in-focus point by interpolating the focus signals.
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patent: 4872058 (1989-10-01), Baba et al.
patent: 4967279 (1990-10-01), Murashima
patent: 4990947 (1991-02-01), Komiya et al.
patent: 5016110 (1991-05-01), Vuichard et al.
"Automatic Focus Adjustment of Hill-Climbing Servo Scheme in TV Camera", NHK Technical Research, vol. 17, No. 1, Ser. No. 86,1965, pp. 21-37.
Adams Russell E.
Noh Jae
Olympus Optical Co,. Ltd.
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