Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-01-17
1992-07-21
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358167, H04N 514
Patent
active
051327953
ABSTRACT:
An adaptive vertical low pass filter for a television signal process comprises an input for receiving an unfiltered video data stream and an output for putting out an adaptively low pass filtered video data stream. An adaptive processing circuit between the input and the output provides the adaptively low pass filtered video data stream in accordance with an adaptive control signal. A vertical condition detection circuit is responsive to at least one predetermined vertical condition at the input and includes a filtering component generator for generating the adaptive control signal in response to detection of the predetermined vertical pixel condition and for applying the adaptive control signal to the combiner circuit. The predetermined vertical pixel conditions may include vertical high frequency energy, integrated vertical high frequency energy, vertical impulses of one or two scan line durations irrespective of magnitude or direction, vertical transition edge levels, picture level or picture motion irrespective of magnitude or direction.
REFERENCES:
patent: 4825289 (1989-04-01), Ohta
Eakin James E.
Groody James J.
Harvey David E.
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