Motion adaptive luminance signal and color signal separating filter

Claim 2

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 accordance with an inframe signal in response to the movement of a picture, said motion adaptive luminance signal and color signal separating filter comprising: an interfield luminance signal and color signal separating means for separating the luminance signal and the color signal by utilizing interfield correlation; and an infield luminance signal and color signal separating means for separating the luminance signal and the color signal by utilizing infield correlation.

Claim 3

The motion adaptive luminance signal and color signal separating filter according to claim 1, wherein said interfield luminance signal and color signal separating means includes a horizontal correlation luminance signal and color signal separating circuit and a plurality of interfield luminance signal and color signal separating circuits, and the motion adaptive luminance signal and color signal separating filter further comprising: selecting means for selecting either an output from said infield correlation luminance signal and color signal separating means or an output from said interfield luminance signal and color signal separating means and for outputting the selected output; said plurality of said interfield luminance signal and color signal separating circuits separating said luminance signal and said color signal by the processings of the signal of a principal pixel, which is an object of processing, and the signals of pixels different form each other.

Claim 4

The motion adaptive luminance signal and color signal separating filter according to claim 2, wherein said selecting means determines which output should be selected by a degree of the correlation between a signal of said principal pixel and a signal of the different pixels which are processed therewith.

Claim 5

The motion adaptive luminance signal and color signal separating filter according to claim 3, further comprising: isolated point removing means for correcting a result for said principal pixel selected by said selecting means by comparing a result for said principal pixel selected by said selecting means and a result for a plurality of pixels in a vicinity of said principal pixel in a same field as a field of said principal pixel.

Claim 6

The motion adaptive luminance signal and color signal separating filter according to claim 3, further comprising: isolated point removing means for correcting a result for said principal pixel selected by said selecting means by comparing a result for said principal pixel selected by said selecting means and a result for a plurality of pixels in a vicinity of said principal pixel in a different field from a field of said principal pixel.

Claim 9

The method as claimed in claim 6, wherein said step (d) includes detecting local movement in the picture by utilizing interframe correlation.

Claim 10

The method as claimed in claim 6, wherein said step (c) comprises the substeps of: (c1) mixing the separated luminance signals of steps (a) and (b); and (c2) mixing the separated color signals of steps (a) and (b).

Claim 11

A circuit for separating a chrominance signal and a luminance signal from a color television signal in which the frequency of the chrominance signal is multiplexed in the frequency of the luminance signal in response to movement in a picture comprising: interframe separating means for separating the luminance signal and the chrominance signal by utilizing interframe correlation; separating means for separating inframe luminance signal and chrominance signal by utilizing interfield correlation; mixing means for mixing the separated luminance and chrominance signals produced by said interframe separating means and said interfield separating means; detection means for detecting movement in the picture; and mixing control means for varying a mixing ratio of the separated luminance and chrominance signals in said mixing means in accordance with the detected movement, thereby producing a motion adaptive separated luminance and chrominance signal.

Claim 12

A circuit for separating a chrominance signal and a luminance signal from a color television signal in which the frequency of the chrominance signal is multiplexed in the frequency of the luminance signal in response to movement in a picture comprising: interframe separating means for separating the luminance signal and the chrominance signal by utilizing interframe correlation; separating means for separating inframe luminance signal and chrominance signal by utilizing interfield correlation; mixing means for mixing the separated luminance and chrominance signals produced by said interframe separating means and said interfield separating means; detection means for detecting movement in the picture; and mixing control means for varying a mixing ratio of the separated luminance and chrominance signals in said mixing means in accordance with the detected movement, thereby producing a motion adaptive separated luminance and chrominance signal.

Claim 13

The circuit as claimed in claim 9, wherein said detection means detects local movement in the picture by utilizing interframe correlation.

Claim 14

The circuit as claimed in claim 9, wherein said mixing means comprises: first mixing means for mixing the separated luminance signals; and second mixing means for mixing the separated chrominance signals.

Claim 17

The device as claimed in claim 12 wherein said interfield correlation is an inframe correlation.

Claim 18

The device as claimed in claim 12 wherein said separating means mathematically sums a composite color signal of an objective sample point in a first field and one of a plurality of composite color signals of sample points located proximate to the objective sample point in a second field to produce a luminance signal by interfield processing of the composite color signal.

Claim 21

The device as claimed in claim 15 wherein said first separating means mathematically sums a composite color signal of an objective sample point in a first field and one of a plurality of composite color signals of sample points located proximate to the objective sample point in a second field to provide interfield processing of the composite color signal.

Claim 24

The device as claimed in claim 17 wherein said first signal is a luminance signal.

Claim 25

The device as claimed in claim 17 wherein said first signal is a chrominance signal.

Claim 26

The device as claimed in claim 18 wherein said separating means mathematically sums a composite color signal of an objective sample point in the first field and one of a plurality of composite color signals of sample points located proximate to the objective sample point in the second field to provide interfield processing of the composite color signal.

Claim 27

The device as claimed in claim 15 further comprising: subtracting means, operatively connected to said selecting means, for subtracting the selected signal from the color composite signal to produce a chrominance signal.

Claim 28

The device as claimed in claim 21 wherein said first separating means mathematically sums a composite color signal of an objective sample point in the first field and one of a plurality of composite color signals of sample points located proximate to the objective sample point in the second field to provide interfield processing of the composite color signal.

Claim 31

The method as claimed in claim 23 wherein said step (a) mathematically sums a composite color signal of an objective sample point in the first field and one of a plurality of composite color signals of sample points located proximate to the objective sample point in the second field to provide interfield processing of the composite color signal.

Claim 34

The method as claimed in claim 25 wherein said step (a) mathematically sums a composite color signal of an objective sample point in the first field and one of a plurality of composite color signals of sample points located proximate to the objective sample point in the second field to provide interfield processing of the composite color signal.

Claim 37

The system as claimed in claim 27 wherein said separating means comprises: first means for generating three distinct interfield separated signals from the composite signal, each interfield separated signal being derived from a composite color signal of a fist field and a composite color signal of a second field, and for outputting said three distinct interfield separated signals; second means for generating an infield separated signal, said infield separated signal being derived from a first composite color signal of said first field a second composite color signal of said first field, and for outputting said infield separated signal; selecting means, operatively connected to said first and second separating means, for evaluating a correlation relationship between points in different fields and for selecting either one of said three distinct separated luminance signals or said infield separated signal in accordance with the correlation evaluation; and subtracting means, operatively connected to said selecting means, for subtracting the selected signal from the composite color signal to produce the luminance and chrominance signals; said mixing means receiving more of an output of said subtracting means if the motion detected by said motion detecting means is relatively large and for receiving more of an output of said interframe correlation luminance and chrominance signal separating means if the motion detected by said motion detecting means is relatively small, whereby luminance and chrominance signals outputted form said subtracting means and interframe correlation luminance and chrominance signal separating means can be mixed.

Claim 38

The system as claimed in claim 28 wherein said first signal is a luminance signal.

Claim 39

The system as claimed in claim 28 wherein said first signal is a chrominance signal.

Claim 40

A luminance and chrominance signal separating filter adaptive to a movement of an image, which separates luminance signals and chrominance signals from composite color television signals representing the image in which the chrominance signals are frequency-multiplexed within a high frequency region of the luminance signals, comprising: a motion detecting circuit which detects movement of an image utilizing a correlation between frames; an interframe separating circuit which performs a first separation of luminance and chrominance signals utilizing the interframe correlation when said motion detecting circuit detects a still image, and outputs interframe separated chrominance signals and interframe separated luminance signals; an inframe separating circuit to separate chrominance signals from the composite signal in a first field of a first frame by using composite signals from a second field of the first frame to develop a separated chrominance signal; a first signal mixing circuit which mixes the interframe separated chrominance signals and the inframe separated chrominance signals in accordance with an output of said motion detecting circuit and outputs motion adaptive separated chrominance signals; and a second signal mixing circuit which mixes the interframe separated luminance signals and the inframe separated luminance signals in accordance with the output of said motion detecting circuit and outputs motion adaptive separated luminance signals.

Claim 41

A luminance and chrominance signal separating filter adaptive to a movement of an image, which separates luminance signals and chrominance signals from composite color television signals representing the image in which the chrominance signals are frequency-multiplexed within a high frequency region of the luminance signals, comprising: a motion detecting circuit which detects movement of an image utilizing a correlation between frames; an interframe separating circuit which performs a first separation of luminance and chrominance signals utilizing the interframe correlation when said motion detecting circuit detects a still image, and outputs interframe separated chrominance signals and interframe separated luminance signals; an inframe separating circuit to separate chrominance signals from the composite signal in a first field of a first frame by using composite signals from a second field of the first frame to develop a separated chrominance signal; a first signal mixing circuit which mixes the interframe separated chrominance signals and the inframe separated chrominance signals in accordance with an output of said motion detecting circuit and outputs motion adaptive separated chrominance signals; and a second signal mixing circuit which mixes the interframe separated luminance signals and the inframe separated luminance signals in accordance with the output of said motion detecting circuit and outputs motion adaptive separated luminance signals.

Claim 42

A luminance and chrominance signals separating filter adaptive to a movement of an image, which separates luminance signals and chrominance signals from composite color television signals representing the image in which the chrominance signals are frequency-multiplexed with a high frequency region of the luminance signals, comprising: a motion detecting circuit to partially detect movement of an image utilizing a correlation between frames; an interframe separating circuit which performs a first separation utilizing the interframe correlation when said motion detecting circuit detects a still image, and outputs interframe separated luminance signals and interframe separated chrominance signals; a correlation detecting circuit to partially detect a correlation in a field or between fields when said motion detecting circuit detects a moving image; an isolated point eliminating circuit which decides the correlation from the detected results of a selected pixel and nearby pixels in the neighborhood of the selected pixel when the detected result of the particular sapling pint is an isolated point; an inframe separating circuit which selects an optimum process from a plurality of inframe processes including interfield operations in accordance with the decided correlation and outputs inframe separated chrominance signals and inframe separated luminance signals; a first signal mixing circuit which mixes the interframe separated luminance signals and the inframe separated luminance signals in accordance with the output of said motion detecting circuit and outputs motion adaptive separated luminance signals; and a second signal mixing circuit which mixes the interframe separated chrominance signals and the inframe separated chrominance signals in accordance with the output of said motion detecting circuit and outputs motion adaptive separated chrominance signals.

Claim 43

A luminance and chrominance signals separating filter adaptive to a movement of an image, which separates luminance signals and chrominance signals from composite color television signals representing the image in which the chrominance signals are frequency-multiplexed with a high frequency region of the luminance signals, comprising: a motion detecting circuit to partially detect movement of an image utilizing a correlation between frames; an interframe separating circuit which performs a first separation utilizing the interframe correlation when said motion detecting circuit detects a still image, and outputs interframe separated luminance signals and interframe separated chrominance signals; a correlation detecting circuit to partially detect a correlation in a field or between fields when said motion detecting circuit detects a moving image; an isolated point eliminating circuit which decides the correlation from the detected results of a selected pixel and nearby pixels in the neighborhood of the selected pixel when the detected result of the particular sapling pint is an isolated point; an inframe separating circuit which selects an optimum process from a plurality of inframe processes including interfield operations in accordance with the decided correlation and outputs inframe separated chrominance signals and inframe separated luminance signals; a first signal mixing circuit which mixes the interframe separated luminance signals and the inframe separated luminance signals in accordance with the output of said motion detecting circuit and outputs motion adaptive separated luminance signals; and a second signal mixing circuit which mixes the interframe separated chrominance signals and the inframe separated chrominance signals in accordance with the output of said motion detecting circuit and outputs motion adaptive separated chrominance signals.

Claim 44

The luminance and chrominance signals separating filter adaptive to a movement of an image in accordance with claim 32, wherein said isolated point eliminating circuit detects interfield correlations in differing direction by the comparison of selected pixel and neighboring pixels from the output of said correlation detecting circuit, and selects the direction of greater correlation to decide the interfield correlation at the particular sampling point.

Claim 47

The method as claimed in claim 34 wherein the first signal is a chrominance signal.

Claim 48

The method as claimed in claim 34 wherein the first signal is a luminance signal.

Claim 49

The method as claimed in claim 35 wherein the nearby pixels used in said step (a) of determining are spatially nearby pixels in a different field of the image.

Claim 50

The method as claimed in claim 35 wherein the adjacent pixels used in said step (b) of eliminating isolated points are spatially nearby pixels in a different field of said image.

Claim 51

A luminance and chrominance signal separating filter for separating the luminance and chrominance component signals from a composite color television signal defining sequential television frames adaptive to movement of an image defined by the composite color television filter, the chrominance signals being frequency multiplexed with a high-pass frequency region of the luminance signals, comprising: a correlation detector to determine, for each selected pixel of an image defined by the composite color television signal, a degree of correlation to at least tow nearby pixels which extend in differing directions to determine a direction of highest correlation, the direction of highest correlation of said selected pixel being associated with one of said nearby pixels; an isolated point eliminator, response to said correlation detector, to eliminate isolated points by smoothing the direction of highest correlation of each said selected pixel with the directions of highest correlation of a group of adjacent pixels to produce an isolated point corrected direction of highest correlation for said selected pixel; inframe processor means for combining the portion of the composite color television signal defining the selected nearby pixel associated with the isolated point corrected direction of highest correlation produced by said isolated point eliminator with the portion of the composite color television signal defining the selected pixel to develop a separated first signal associated with the selected pixel; a subtractor to subtract the first signal from the composite color television signal to produce both a luminance signal and a chrominance signal from the composite color television signal.

Claim 52

A luminance and chrominance signal separating filter for separating the luminance and chrominance component signals from a composite color television signal defining sequential television frames adaptive to movement of an image defined by the composite color television filter, the chrominance signals being frequency multiplexed with a high-pass frequency region of the luminance signals, comprising: a correlation detector to determine, for each selected pixel of an image defined by the composite color television signal, a degree of correlation to at least tow nearby pixels which extend in differing directions to determine a direction of highest correlation, the direction of highest correlation of said selected pixel being associated with one of said nearby pixels; an isolated point eliminator, response to said correlation detector, to eliminate isolated points by smoothing the direction of highest correlation of each said selected pixel with the directions of highest correlation of a group of adjacent pixels to produce an isolated point corrected direction of highest correlation for said selected pixel; inframe processor means for combining the portion of the composite color television signal defining the selected nearby pixel associated with the isolated point corrected direction of highest correlation produced by said isolated point eliminator with the portion of the composite color television signal defining the selected pixel to develop a separated first signal associated with the selected pixel; a subtractor to subtract the first signal from the composite color television signal to produce both a luminance signal and a chrominance signal from the composite color television signal.

Claim 53

The filter as claimed in claim 39 wherein said first signal is a chrominance signal.

Claim 54

The filter as claimed in claim 40 wherein said first signal is a luminance signal.