Suppression of flicker effects in a television receiver

Details Suppression of flicker effects in a television receiver Suppression of flicker effects in a television receiver

1988-11-29

1990-08-07

Peng, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 11, 358140, H04N 701, H04N 1120, H04N 5208

Patent

active

049472518

ABSTRACT:
A received video signal, in which a complete picture is made up of two line-interlaced picture fields that are successively transmitted, is converted in two different ways into respective video signals of the same vertical scan frequency in which a full complement of television lines is provided in each vertical scan interval. In a first conversion favorable to picture contents in which there is considerable motion, there are added, to the lines of one picture field of the received signal, a set of interpolated lines derived from the lines of that field. In a second conversion designed to avoid flicker at horizontal edges in the picture, the lines of two successive picture fields of the received signal are used to make up a full complement of lines. Both conversions involve time-compressing the lines so that a full complement of lines can be transmitted in a vertical scan interval. An edge detector which provides an edge signal when successive lines of a field of the received signal show a certain degree of consistent contrast are used to control a fading circuit which makes the second conversion dominant when an edge is detected and allowing the first conversion to be provided to the output when no edge is detected. The use of two edge detectors simultaneously acting on successive fields is useful to avoid failure to respond to a very narrow horizontal streak. The hardware implementation is economical and avoids the use of expensive picture motion detectors.

REFERENCES:
patent: 4435728 (1984-03-01), Raven et al.
patent: 4598309 (1986-07-01), Casey
patent: 4625239 (1986-11-01), Vreeswijk et al.
patent: 4663653 (1987-05-01), Patel
patent: 4672445 (1987-06-01), Casey et al.
patent: 4677482 (1987-06-01), Lewis, Jr.

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