Television – Image signal processing circuitry specific to television – Hue control
Patent
1994-07-08
1995-06-20
Groody, James J.
Television
Image signal processing circuitry specific to television
Hue control
348651, 348514, H04N 974
Patent
active
054264685
ABSTRACT:
In a composite video system having a digitized composite video signal to be modified, wherein the digitized video signal has discrete values having sampling frequency Nf.sub.s where N is an integer greater than one, and f.sub.s is the color subcarrier frequency of the video input signal, a method and apparatus for utilizing look-up tables to create special color effects without decoding to luminance and chrominance, the method having the steps of storing in memory N sets of predetermined values such that the sets are addressable in a desired predetermined order and such that the predetermined values relate to a discrete equal distant points on a color subcarrier frequency wave corresponding to a desired color, retrieving from memory the stored values at a rate Nf.sub.s such that the N sets are addressed in the predetermined order, and using the digitized composite video signal to address said memory, to produce a digitized video output signal with different values, as desired.
REFERENCES:
patent: 4325075 (1982-04-01), Kashigi et al.
patent: 4445135 (1984-04-01), Heitmann et al.
patent: 4688081 (1987-08-01), Furuhata
patent: 4729013 (1988-03-01), Tatami et al.
Clark Bruce J.
Groody James J.
Murrell Jeffrey S.
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