Video scaling method and device

Details Video scaling method and device Video scaling method and device

1994-09-07

1996-11-12

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358448, 382298, 36471507, 3647241, H04N 1393, H04N 140

Patent

active

055745725

ABSTRACT:
A linear interpolator and decimating FIR filter with constant coefficients may be used in various configurations to scale a still or moving color video image horizontally (changing the number of pixels per row) or vertically (changing the number of pixels per column). For downscaling, the input pixel stream is initially upscaled with an interpolator by an upscaling factor of between one and two chosen so that the result can be subsequently downscaled with a decimation-by-power-of-two finite impulse response (FIR) filter to provide the desired final scaling. Upscaling is a special case accomplished by means of linear interpolation. Vertical and horizontal scaling may be performed with different, independent scaling factors.

REFERENCES:
patent: 4328426 (1982-05-01), D'Ortenzio
patent: 4991022 (1991-02-01), Canfield et al.
patent: 5125042 (1992-06-01), Kerr et al.
patent: 5289292 (1994-02-01), Osada et al.
patent: 5335295 (1994-08-01), Ferracini et al.

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