Method and apparatus for correction of a television luminance si

Details Method and apparatus for correction of a television luminance si Method and apparatus for correction of a television luminance si

1987-05-20

1988-06-21

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 30, H04N 514

Patent

active

047528214

ABSTRACT:
Color differences between primary color components obtained from a matrix in the usual way are combined by pairs in six non-additive mixers in a known way to produce six color sector signals. In a known system, these sector signals are individually amplitude adjustable for color correction purposes. In order to provide a correction for the luminance signal corresponding to the color corrections that may be made, a low pass-filtered luminance signal is used to multiply either all of the sector signals individually before amplitude adjustment or to multiply their sum after amplitude adjustment, the ultimate product-sum in each case being added to the full-band luminance signal for provision of a corrected luminance signal. The final addition can be eliminated if multiplication of the summation by the unfiltered luminance signal, but in this case it is necessary to add a constant to the sum of adjusted sector signals to serve as the multiplier input when no luminance correction is necessary and it is also then necessary to filter out the product frequencies higher than 5 MHz from the multiplier output that then serves as the corrected luminance signal.

REFERENCES:
patent: 4410908 (1983-10-01), Belmaves-Sarabia et al.
patent: 4597006 (1986-06-01), Orsburn

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