Video signal interpolation

Details Video signal interpolation Video signal interpolation

1990-04-10

1991-12-03

Peng, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358140, 358 11, H04N 712, H04N 701, H04N 1120

Patent

active

050704036

ABSTRACT:
In an apparatus and method for deriving gradient vectors for use in the spatial interpolation of an input digital video signal; the scan lines of a field of the input digital video signal are high pass filtered so as to provide a high pass filtered video signal which is supplied to a plurality of parallel processing channels in which the high pass filtered video signal is differently low pass filtered so as to form respective low pass filtered video signals, the correlation for a range of pixel offsets is determined pixel-by-pixel for the video signal outputs from the channels so as to form a plurality of gradient vectors for each pixel of the input digital video signal, and the gradient vector is selected, for each pixel of the input digital video signal, which corresponds to the maximum correlation value therefor. The apparatus for deriving gradient vectors is also applicable to a television standards converter.

REFERENCES:
patent: 4488174 (1984-12-01), Mitchell et al.
patent: 4853775 (1989-08-01), Rouvrais et al.
patent: 4862266 (1989-08-01), Gillard

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