Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-12-21
1993-05-11
Perkey, W. B.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358227, G03B 1336, H04N 5232
Patent
active
052105644
ABSTRACT:
An automatic focusing device has an A/D converter for converting a supplied video signal to a digital signal; an orthogonal converter for converting a video signal transmitted from the A/D converter to a signal indicative of a frequency component region; and a control section for producing a control signal for performing a focusing operation based on information of the frequency component transmitted from the orthogonal converter. The orthogonal converter performs a discrete cosine transformation with respect to the digitally converted video signal. The orthogonal converter transmits low to high frequency components from the digitally converted video signal. The control section transmits the control signal for performing a focusing operation based on an arbitrary component of the frequency components transmitted from the orthogonal converter. A circuit for performing the focusing operation may be constructed on the basis of a plurality of frequency components.
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Perkey W. B.
Ricoh & Company, Ltd.
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