Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1985-02-22
1986-04-15
Rubinson, Gene Z.
Facsimile and static presentation processing
Facsimile
Recording apparatus
354400, 354421, 352140, H04N 326
Patent
active
045831238
ABSTRACT:
In this circuit, video signals with a continuously increasing or decreasing amplitude are applied to the signal input of a threshold difference comparator at whose reference inputs selectively determined high and low threshold signals are applied. The output of the threshold difference comparator is applied at the first input of a threshold AND gate having a second input connected to a clock. The output of the threshold AND gate supplies a clock pulse sequence which has a duration corresponding with the time during which the input video signal has an amplitude which continuously increases or decreases from one of the threshold reference amplitudes to the other. The clock pulse sequences contained in successive measuring intervals have their respective pulses counted by a counter, and are stored in a buffer. A measurement series is performed corresponding to different focus settings, optimum focus adjustment being achieved when a minimum count of clock pulses in a clock pulse sequence is obtained.
REFERENCES:
patent: 4298259 (1981-11-01), Aoki et al.
patent: 4345825 (1982-08-01), Matteson et al.
patent: 4382665 (1983-05-01), Eguchi et al.
patent: 4383274 (1983-05-01), Inuiya
Baier Heinz
Kallmeyer Michael
Koepp Peter
Pfeffer Erwin
Schneiderhan Martin
Drumheller Ronald L.
International Business Machines - Corporation
Lev Robert G.
Rubinson Gene Z.
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