H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/42
H04N 9/69 (2006.01) H04N 9/09 (2006.01)
Patent
CA 1088199
CONTRAST CORRECTION ARRANGEMENTS ABSTRACT OF THE DISCLOSURE A contrast correction arrangement for use in a color television system includes a plurality of camera tubes each for producing electrical signals corresponding to a dif- ferent primary colour in a scene viewed by the tubes. A colour coder produces from the camera tubes a composite colour coded signal in accordance with a predetermined broad- casting standard. Also produced is a signal representative of the greatest brightness in the viewed scene. A multiplier multiplies the difference between the signal representative of the greatest brightness and a predetermined peak amplitude thereof by a control signal such that a further signal is produced which is variable in both sign and magnitude in dependence upon the departure of the signal representative of the greatest brightness from peak amplitude. A further multiplier multiplies this further signal with the composite colour coded signal so as to produce a video correction signal of sign varying in dependence upon the sign of the further signal. A mixer adds the video correction signal to the composite colour coded signal thereby to produce at the mixer output a video signal of compressed, normal or expanded contrast range.
283749
Kirby Eades Gale Baker
Marconi Company Limited (the)
LandOfFree
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