| 摘要 |
A hue control circuit receives a video signal at an input terminal in the form of alternating multiplexed color difference samples Cb and Cr. The video signal is multiplied in a multiplier by a factor cos phi , phi representing a desired hue adjustment, and the resulting multiplied signal is supplied to an adder. The video signal is also subjected to order inversion by flip-flops and a buffer circuit as a result of which the order of corresponding pairs of samples Cb and Cr is reversed. The reversed-order video signal is multiplied in a second multiplier by one of alternating factors -sin phi and +sin phi , and the resulting multiplied signal is supplied to the adder. The multiplied signals are summed in the adder to produce hue adjusted color difference samples Hb and Hr, where: Hb=Cb cos phi -Cr sin phi and Hr=Cb sin phi +Cr cos phi .
|
