Recovery of luminance and chrominance information from an encode

Details Recovery of luminance and chrominance information from an encode Recovery of luminance and chrominance information from an encode

1987-06-10

1989-04-04

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 978

Patent

active

048190616

ABSTRACT:
An apparatus and method for decoding an encoded video signal combs a two dimensional array of pixels from a single field of the encoded video signal according to selected weighting factors to obtain a weighted average chrominance value. The weighted average chrominance value is subtracted from the encoded value to obtain an initial luminance value. The initial luminance value is corrected for residual chrominance errors that exist at edges in the picture represented by the encoded video signal. The luminance correction is based upon the chorminance difference across the edge and upon the orientation of the edge. The corrected luminance value may then be subtracted from the corresponding encoded video value to obtain a corrected chrominance value.

REFERENCES:
patent: 4352122 (1982-09-01), Reitmeier et al.
Maxemchuk et al, Separation of NTSC Signals by Minimum Mean Square Error Filters and Adaptive Filters, IEEE Transactions on Communications, vol. COM-26, No. 5, May 1978 pp. 583-593.

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