Video scan rate conversion method and apparatus for achieving sa

Details Video scan rate conversion method and apparatus for achieving sa Video scan rate conversion method and apparatus for achieving sa

1991-08-01

1992-12-01

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358160, H04N 701

Patent

active

051683598

ABSTRACT:
In a video system, a video signal operates at a vertical scan rate to gente a first video frame characterized by a first number of lines per frame. A method and apparatus are provided to convert the first video frame into a second video frame characterized by a second number of lines per frame. The first video frame is stored at the vertical scan rate as digital samples. A portion of the stored digital samples from each line of the first video frame are retrieved at the vertical scan rate. The number of digital samples in the retrieved portion from each line of the first video frame is governed by a ratio equal to the second number divided by the first number, such that the retrieved portion from the first video frame is the second video frame.

REFERENCES:
patent: 4623922 (1986-11-01), Wischermann
patent: 4694337 (1987-09-01), Lyons
patent: 4766494 (1988-08-01), Doyle
patent: 5008752 (1991-04-01), Van Nostrand
patent: 5097518 (1992-03-01), Scott et al.

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