Motion adaptive luminance signal and color signal separating filter
First Claim
1. A motion adaptive luminance signal and color signal separating filter for separating a color signal and a luminance signal from a color television signal in which the frequency of the color signal is multiplexed in the frequency of the luminance signal in response to movement of a picture, the motion adaptive luminance signal and color signal separating filter comprising:
- (A) an interframe luminance signal and color signal separating circuit for separating and subsequently outputting said luminance signal and said color signal by utilizing interframe correlation;
(B) an inframe luminance signal and color signal separating circuit, includingthree kinds of interfield luminance signal has been color signal separating means for separating said luminance signal and said color signal by utilizing interfield correlation, andinfield luminance signal and color signal separating means for separating said luminance signal and said color signal by utilizing infield correlation;
(C) mixing means for mixing luminance and color signal outputs of said interframe luminance signal and color signal separating circuit and a selected luminance and color signal output of said inframe luminance signal and color signal separating circuit;
(D) movement detecting means for detecting movement of said picture; and
(E) means for changing the mixing ratio of the luminance and color signal output of said interframe luminance signal and color signal separating circuit and the selected luminance and color signal output of said inframe luminance signal and color signal separating circuit in accordance with a result obtained by said movement detecting means, to produce a motion adaptive separated luminance and chrominance signal.
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Accused Products
Abstract
A filter is used for separating a color signal and a luminance signal from a composite color television signal in which the frequency of the color signal is multiplexed in a high-frequency region of the luminance signal. In response to the movement of a picture, an appropriate filter is selected from a filter utilizing interframe correlation, a filter utilizing interfield correlation and a filter utilizing the infield correlation. A plurality of filters utilizing filed correlation are prepared and a color signal and a luminance signal are separated by the processing of a principal pixel, which is an object of processing, and pixels different from each other. A filter is selected in accordance with the correlation state between the principal pixel and the pixels therearound.
31 Citations
10 Claims
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1. A motion adaptive luminance signal and color signal separating filter for separating a color signal and a luminance signal from a color television signal in which the frequency of the color signal is multiplexed in the frequency of the luminance signal in response to movement of a picture, the motion adaptive luminance signal and color signal separating filter comprising:
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(A) an interframe luminance signal and color signal separating circuit for separating and subsequently outputting said luminance signal and said color signal by utilizing interframe correlation; (B) an inframe luminance signal and color signal separating circuit, including three kinds of interfield luminance signal has been color signal separating means for separating said luminance signal and said color signal by utilizing interfield correlation, and infield luminance signal and color signal separating means for separating said luminance signal and said color signal by utilizing infield correlation; (C) mixing means for mixing luminance and color signal outputs of said interframe luminance signal and color signal separating circuit and a selected luminance and color signal output of said inframe luminance signal and color signal separating circuit; (D) movement detecting means for detecting movement of said picture; and (E) means for changing the mixing ratio of the luminance and color signal output of said interframe luminance signal and color signal separating circuit and the selected luminance and color signal output of said inframe luminance signal and color signal separating circuit in accordance with a result obtained by said movement detecting means, to produce a motion adaptive separated luminance and chrominance signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of separating a color signal and a luminance signal from a color television signal in which the frequency of the color signal is multiplexed in the frequency of the luminance signal in response to movement of a picture, the method comprising the steps of:
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(a) separating and subsequently outputting the separated luminance signal and the color signal by utilizing interframe correlation; (b) separating inframe luminance signal and color signal by utilizing interfield correlation; (c) separating the inframe luminance signal and color signal by utilizing infield correlation; (d) outputting a selected separated luminance and color signal from one of steps (b) and (c); (e) mixing output separated luminance and color signals of steps (a) and (d); (f) detecting movement of the picture; and (g) varying a mixing ratio of the output separated luminance and color signals of steps (a) and (d) in accordance with the detected movement of step (f), to produce a motion adaptive separated luminance and chrominance signal. - View Dependent Claims (9, 10)
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Specification