Method and apparatus for reducing the effect of alias components

Details Method and apparatus for reducing the effect of alias components Method and apparatus for reducing the effect of alias components

1994-11-04

1996-07-09

Kostak, Victor R.

Television

Image signal processing circuitry specific to television

Gray scale transformation

348254, H04N 969, H04N 5202

Patent

active

055349480

ABSTRACT:
In non-linear digital video processing, high frequency components resulting from the non-linearity may appear as spurious low frequencies due to mirror image spectral reflection in the sampling frequency fs. The non-linear circuit may be a gamma corrector (35). The effect of the alias components is reduced by the use of a modifier circuit (50) before the gamma corrector, and a corresponding equalizer circuit (52) after it. The modifier attenuates the high frequency signal components, especially in the region fs/4 to fs/2. The equalizer substantially reinstates the overall frequency response. Both modifier and equalizer may be transversal filters (FIGS. 5 to 8) which, more generally, may be one dimensional or two dimensional (FIGS. 9 and 10). The system is also particularly relevant to progressively scanned sources; including telecine.

REFERENCES:
patent: 4591900 (1986-05-01), Heeb et al.
patent: 4827342 (1989-05-01), Ohta et al.
patent: 4829367 (1989-05-01), Dubois et al.
patent: 4833527 (1989-05-01), Kondo
patent: 4984068 (1991-01-01), Sugiyama et al.
patent: 4999702 (1991-03-01), Knierim et al.
Patent Abstracts of Japan, vol. 13, No. 374 (E-808) (3722).
Patent Abstracts of Japan, vol. 11, No. 11 (E-470) (2458).

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