Television – Image signal processing circuitry specific to television – Chrominance signal amplitude control
Patent
1992-02-28
1994-10-11
Groody, James J.
Television
Image signal processing circuitry specific to television
Chrominance signal amplitude control
348649, H04N 964
Patent
active
053552253
ABSTRACT:
Memories are provided for correction signal values respectively for a hue signal, a saturation signal and a luminance signal derived from a digital color television signal. Each of the memories consists of two memory units which are alternately used for storing new correction signal values and for reading out previously stored correction signal values. The corrected signal values are modified by a key signal, if present, in each case and are then supplied to calculation circuits to each of which a signal derived from the saturation signal is applied. The resulting fully corrected hue and saturation signals are converted back into color difference signals, but the finally corrected luminance signal requires no conversion. The correction signal values are supplied from a computer into which control magnitudes can be entered to produce them. These control magnitudes can be used to define corner points of a deflected line function from which the raw correction signals are derived. Monitors and cursors are used to facilitate correct entry of control magnitudes.
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J. Monahan et al, "Color Correction Techniques for Television Cameras", Sep. 1969, pp. 696-700, Journal of the SMPTE, vol. 78.
H. Schonfelder, Digitale HDTV-Bildmischung, Fernseh und Kino-Technik, vol. 43, No. 6, (1989).
Bachmann Peter
Poetsch Dieter
BTS Broadcast Television Systems GmbH
Burgess Glenton B.
Groody James J.
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