JPH03129992A - Movement adaptive type luminance signal/chrominance signal separating filter - Google Patents

Abstract

PURPOSE:To execute optimum luminance signal/chrominance signal (YC) separation by executing YC separation by inter-field processing when the correlation between the fields of a detected moving image is large, and when there is no inter-field correlation, executing YC separation by intra-field processing. CONSTITUTION:When a detected result from a movement detecting circuit 92 for partially detecting the movement of an image by utilizing correlation between frames is a moving image, inter-field or intra-field correlation is partially detected, and when the inter-field correlation is larger, YC separation is executed by inter-field processing. When there is no inter-field correlation, YC separation is executed by intra-field processing. Thereby YC separation increasing resolution or reducing deterioration in picture quality can be executed even in the case of an image having frequent switching processing between a static image and a moving image.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a luminance signal and chrominance signal separation filter, and more specifically, to a composite color television signal in which a chrominance signal is frequency-multiplexed into a high frequency region of a luminance signal. (hereinafter referred to as ■ signal) to a luminance signal (hereinafter referred to as Y signal or
This invention relates to a motion adaptive YC+ separation filter for separating a color signal (hereinafter referred to as a C signal or C for a car) from a color signal (hereinafter referred to as a C signal or C for a car).

[Prior Art] A motion adaptive YC+heel filter is a filter that locally determines whether an image is a still image or a moving image, and performs Yc separation suitable for pixel signals of each part.

In the current NTSC signaling system, a V signal is obtained by frequency multiplexing a C signal into a high frequency region of a Y signal. For this reason, television receivers require YC separation, and if the separation is incomplete, image quality deterioration such as cross color and dot crawl will occur.

Therefore, with the development of large-capacity digital memory in recent years, the vertical scanning frequency of
Alternatively, the kth signal l for image quality improvement such as motion adaptive YC separation using a delay circuit with a longer delay time.
Various A-buried circuits have been proposed.

FIG. 9 is a block diagram showing a configuration example of a conventional motion adaptive YC separation filter. In the figure, (1) is an input terminal, and an NTSC system (7) V signal (101) is input manually. (4) is an intra-field YC separation circuit, (5) is an inter-frame YC separation circuit, (6) is a Y signal motion detection circuit, (
7) is a C signal motion detection circuit, and each of these circuits (4) to (
The above-mentioned (1) signal (101) is applied to the input terminals of the circuits 7) and 7), respectively.

(9) is a Y signal mixing circuit, (lO) is a C signal mixing circuit, and the in-field YC component lY signal (hereinafter referred to as , Yf flaw signal) (10
2) and in-field YC minute 11C signal (103)
(hereinafter referred to as the Cf signal) are input to the first input terminal of the Y signal mixing circuit (9) and the first input terminal of the C signal mixing circuit (lO), respectively. In addition, the above interframe YC
The interframe YC portion sIY signal (hereinafter referred to as
The YF multiplication signal (104) and the interframe YC signal (105) are respectively connected to the second input terminal of the Y signal mixing circuit (9) and the C signal mixing circuit (10). ) is input to the second input end of the input terminal.

(8) is a synthesis circuit, and the above y (No. 8 motion detection circuit (6
) is manually input to one input terminal, and the C signal motion amount (107) detected by the C signal motion detection circuit (7) is input to the other input terminal. Ru. The motion detection signal (108) synthesized by the synthesis circuit (8) is sent to the third signal of the Y signal mixing circuit (9).
and the third input terminal of the C signal mixing circuit (lO), respectively.

The above Y signal motion detection circuit (6) and C signal motion detection circuit (
7 and the synthesis circuit (8), the motion detection circuit (9)
2) is configured.

(2) and (3) are output terminals, respectively, and the motion adaptive YC separation signal Yi (
109) is sent from the output terminal (2), and the motion adaptive YC component 1lilt which is the output of the C signal mixing circuit Cl0)
The configuration is such that a C signal (110) is sent out from an output terminal (3).

Next, the operation of the above configuration will be explained.

When the motion detection circuit (92) separates the human-powered V signal (101) into Y and C, it synthesizes the outputs of the Y signal motion detection circuit (6) and the C signal motion detection circuit (7) using the synthesis circuit (8). It is determined whether the signal (101) is a signal representing a still image or a signal representing movement.

FIG. 12 is a block diagram showing an example of the configuration of the Y signal motion detection circuit (6), in which the V signal input from the terminal (73) is (lot), and after passing it through a low pass filter (hereinafter referred to as LPF) (77), its absolute value is determined by an absolute value circuit (78), and this absolute value is converted to a nonlinear conversion circuit ( 79) into a signal (106) indicating the amount of movement of the low-frequency component of the Y signal, and send it to the terminal (74).
Output to.

FIG. 10 is a block diagram showing an example of the configuration of the C signal motion detection circuit (7), in which a two-frame delay circuit (64) and a subtracter (65) are used to input the signal from the terminal (11). After finding the difference between two frames of the V signal (1[+1) and passing it through a band pass filter (hereinafter referred to as BPF) (66), its absolute value is found by the absolute value circuit (67), and this absolute value is converted into a signal (107) indicating the amount of motion of the C signal by a nonlinear conversion circuit (68), and outputted to a terminal (72).

In addition, the synthesis circuit (8) also includes, for example, the amount of Y signal movement (io
a) and the C signal motion amount (107), the larger value is selected and output.

The discrimination result is expressed in the form of a motion coefficient k (0≦≦1); for example, if the image is determined to be a completely still image, k = 0, or if the image is determined to be a completely moving image. In this case, k=1, which is given to the Y signal mixing circuit (9) and the C signal mixing circuit (lO) as a detection signal, that is, a control signal (108).

Generally, when the image is a still image, interframe YC separation using interframe correlation is performed to separate the Y signal and C signal.

FIG. 13 is a block diagram showing a detailed configuration example of the inter-frame YC separation circuit (5), in which the one-frame delay circuit (
83) and an adder (84) to find the sum of one frame of the V signal (101) input from the terminal (80) and calculate the YF
The multiplied signal 104) is extracted and outputted to the terminal (81), and the subtracter (85) subtracts the YF multiplied signal 104) from the input V signal (101).
5) is extracted and output to the terminal (82).

In addition, in general, when the image is a moving image, intra-field YC separation using intra-field correlation is performed to
Separate the signal and C signal.

FIG. 14 is a block diagram showing a detailed configuration example of the intra-field YC separation circuit (4), and shows a one-line delay circuit (
89) and an adder (90) to find the one line sum of the V signal (101) input from the terminal (86), and
The Cf signal (10
3) is extracted and output to the terminal (88).

The motion adaptive YC separation filter uses the intra-field YC separation circuit (4) and the inter-frame YC separation circuit (4) as described above.
5) are juxtaposed, and using the motion coefficient k synthesized in the synthesis circuit (8), the Y signal mixing circuit (9) performs the following calculation to generate a motion adaptive YC component 11tY signal (10
9) is output.

Y=kYf+ (1-k)YF Here, Yf: YC portion in the field 111Y number output (102)
YF: Interframe YC BY signal output (104).

Similarly, the control signal (ios) controls the C signal mixing circuit (
Motion adaptive YC is performed by performing the following calculations on lO).
Minute 1aIfC signal (110) Full output through.

C=kCf+ (1-k)CF where, Cf: YC portion in field @C signal output (103) CF
: Interframe YC minute 1IIIC signal output (105).

The motion adaptive Y signal (109) and the motion adaptive C signal (
110) are the output terminal (2) and the output terminal (3), respectively.
).

In such a motion adaptive YC separation filter, the C signal motion detection circuit (7) can also be realized with a configuration as shown in FIG.

In FIG. 11, V input from the input terminal (11)
The signal (1011) is converted to Z fil by the color demodulation circuit (69).
It is demodulated into similar color difference signals R-Y and B-Y. These two types of color difference signals R-Y and B-Y are sent to a time division multiplexing circuit (70).
The signals are time-division multiplexed at a certain frequency, and a two-frame difference is obtained by a two-frame delay circuit (64) and a subtracter (65). The difference between these two frames is L P F (
71) to remove the Y signal component, and the absolute value circuit (67)
to find the absolute value, and convert this absolute value into a nonlinear conversion circuit (6
8), the motion detection amount (107) of the C signal is sent out from the output terminal (72).

[Problems to be Solved by the Invention] Since the conventional motion adaptive YC separation filter is configured as described above, it is possible to combine the amount of motion detected by the Y signal motion detection circuit and the C signal motion detection circuit. Based on YC minutes in the field! 1: According to Yf
Since the filter is configured to mix the double signal Cf signal and the YF double signal and CF double signal resulting from inter-frame YC separation, the filter characteristics for still images and those for moving images are completely different, and as a result, the image changes from still images to moving images. There has been a problem in that there is an extreme change in resolution when moving images or moving from a moving image to a still image, resulting in noticeable deterioration in image quality during moving image processing.

This invention was made to solve the above-mentioned problems, and even for images that require frequent processing switching between still images and moving images, YC+ with high resolution and less image quality deterioration can be achieved.
An object of the present invention is to provide a motion adaptive YC separation filter that can perform separation.

[Means for Solving the Problems] The motion adaptive YC+separation filter according to the present invention, when the detection result of the motion detection circuit that locally detects the motion of an image using the correlation between frames, is a moving image, Furthermore, correlations between fields or within fields are detected locally, and if the correlation between fields is large, YC separation is performed by interfield processing, and if there is no correlation between fields, YC separation is performed by intrafield processing. It is characterized in that it is configured to perform.

[Operation] According to the present invention, when a moving image is detected by the motion detection circuit and the correlation between fields of the moving image is large, YC separation is performed by inter-field processing, and when there is no correlation between fields. By performing YC separation by in-field processing only in the following cases, optimal YC separation can be performed at all times.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described based on the drawings.

FIG. 1 is a block diagram showing the configuration of a motion adaptive YC separation filter according to an embodiment of the present invention, and the difference from the conventional example shown in FIG.
) is simply replaced with the in-frame YC separation circuit (48), and the other configurations are the same, so the corresponding parts C are given the same reference numerals, detailed explanations thereof are omitted, and the operation is also explained. Since they are the same, their explanation will be omitted.

FIG. 2 is a block diagram showing the detailed configuration of the intra-frame YC separation circuit (48). In the same figure, (11)
is the V signal (101) input terminal, (14) and (!
6) is a 262H delay device, (15) is a 262H delay device, and (15) is a 262H delay device for delay compensation.
63H delay device, (17), (ta), (19)
, (20), (22).

(23) and (25) are two-pixel delay devices (hereinafter referred to as 2D delay devices), (21), (24), and (26), respectively.
) and (27) are each one line delay device (hereinafter referred to as IH delay device).

(28), (29), (30), (31)
are adders, (32), (33), (3
4), (35), and (47) are subtractors, respectively.
(3B> , (37) , (38) , (39)
are LPF, (40) respectively.

(41), (42), and (43) are respectively absolute value circuits (hereinafter referred to as ABS), (44) are minimum value selection circuits (hereinafter referred to as MIN), (45) are isolated point removal circuits, ( 4B) is a signal selection circuit. The output of this signal selection circuit (46) is a 1iY signal (11
2) from the output terminal (12), and the subtracter (4
The output of 7) is configured to be output from an output terminal (13) as an intra-frame yc slC signal (113).

FIG. 3 is a block diagram showing the detailed configuration of the isolated point removal circuit (45). In the same figure, (49) is an input terminal for the correlation detection signal (114), and the correlation detection signal input thereto is (114) is a 263H delay device (51).

1 frame delay device (52), IH delay device (53), 2D
Each is input to a delay device (54). The output of the 263H delay device (51) is input to the 2D delay device (55),
The output of the i-frame delay device (52) is connected to a comparator circuit (60),
4-pixel delay device (hereinafter referred to as 4D delay device) (57),
Each is input to an IH delay device (58).

In addition, the output of the IH delay device (53) is the output of the 4D delay device (53).
6) and the comparison circuit (61), and is input to the 2D delay device (
The output of 54) is input to a comparison circuit (62). The output of the 4D delay device (56) is input to a comparison circuit (60), and the output of the 4D delay device (57) is input to a comparison circuit (61).

Furthermore, the output of the IH delay device (58) is the 2D delay device (
59) and this 2D delay! 1 (59) is input to the comparison circuit (62). The above 2D delay device (55
) output and each of the above comparison circuits (60), (61)
, (82) are respectively input to a selection circuit (63), and this selection circuit (63) outputs a control signal <115) to an output terminal (50).

Next, before explaining the operation of the intra-frame YC'i separation circuit (48) configured as shown in FIG.
The basic concept of C separation will be explained.

Figure 4 is a diagram showing the arrangement of V signals digitized at four times the color subcarrier in three-dimensional space and time, with the horizontal direction of the screen as the X axis, the vertical direction of the screen as the y axis, and the In a three-dimensional space-time where the t-axis is the time axis perpendicular to the plane composed of the y-axis, Figure 4 (^) is the plane composed of the t-axis and the y-axis, Figure 4 (B), (C) is the X axis and y
It is a plane composed of axes.

FIG. 4A also shows interlaced scanning lines, in which the dashed lines indicate one field and the solid lines indicate that the color subcarriers are in phase. Further, the solid lines and broken lines in FIG. 4(B) indicate the scanning lines of the n field and the n-1 field, and FIG. 4(C)
The solid lines and dashed lines indicate the scanning lines of the n+1 field and the n field.

The four marks ○, . It represents a sample point.

In FIG. 4(B), if the sample point of interest is represented by O, then in field n, which is the same field, there are four points (a) and (b) before and after the second sample point and one line above and below the second sample point.

The color subcarrier phase ψ differs by 180° in (C) and (d). Therefore, a line comb filter using a digital circuit, an adaptive YC separation filter disclosed in Japanese Patent Application Laid-Open No. 58-242367, etc. can be constructed.

Furthermore, as shown in FIG. 4(^), since the color subcarrier phase ψ differs by 180° at the same sample point one frame apart, an interframe YC separation filter can also be configured. Saraji, 4th
As can be seen from Figure (B), in the n-1 field one field before the sample point of interest, the phase is opposite around the sample point one line above or two sample points one line below. ), (a) and (ii) and the point of interest enables inter-field YC separation.

FIG. 5 shows a projection diagram of a three-dimensional frequency space composed of a horizontal frequency axis μ axis, a vertical frequency axis υ axis, and a time frequency axis t axis as frequency axes corresponding to the X axis, y axis, and t axis. Figure 5 (^) is a diagram of the three-dimensional frequency space viewed from an oblique direction, Figure 5 (B) is a diagram of the three-dimensional frequency space viewed from the negative direction of the t-axis, Figure 5 (C) is a diagram of the three-dimensional frequency space viewed from the positive direction of the μ axis.

Figure 5 above also shows the spectral distribution of the V signal on the three-dimensional frequency space, and as can be seen from the figure, the spectrum of the Y signal spreads around the origin of the three-dimensional frequency space, and the spectrum of the C signal spreads around the origin of the three-dimensional frequency space. The spectrum of the signal is the color subcarrier frequency fs
At c! Since the signal and Q signal are orthogonal two-phase modulated, they are located in four spaces as shown in Figure 5, and
When the signal is viewed on the μ axis, it exists only in the second and fourth quadrants, as shown in FIG. 5(C). This is Figure 4 (B)
This corresponds to the fact that the solid line representing the same phase of the color subcarriers rises over time.

Nevertheless, in the conventional example described above, when motion in an image is detected, YC separation is performed using correlation within the field, so band limitation in the μ-axis and υ-axis directions is possible. , it is not possible to add band limitation in the f-axis direction, and therefore the frequency space where the Y signal originally exists has to be separated as the C signal.
The signal band was narrow.

Therefore, by performing YC separation using inter-field processing, the band of the Y signal in a moving image can be expanded.

In Fig. 4 (B), the points near the sample point ◎ of interest in the n-1 field and with a 180° difference in brown subcarrier phase are the sample points No (A) (B) (R). That's 3 points. Interfield Y by calculation with any of these three points
C separation becomes possible.

First, if we consider YC separation by calculation of sample point ◎ of interest and sample point . I get a signal. Figure 6, like Figure 5, shows a three-dimensional frequency space, and shows the frequency space in which the Y signal and C signal obtained by calculation between the target rice production and the sample point (A) exist. .

Second, the sample point ◎ and the sample point ・
If we consider YC separation by calculation with (a), the Y signal is obtained by the sum of these two sample points, and the C signal is obtained by the difference.
I get a signal. Figure 7, like Figure 6, also shows the frequency space in which the Y signal and C signal exist, obtained by calculation between the sample point of interest and the sample point (A). The C signal is included in a part of the Y signal, but the Y signal and the C signal
Since the signals have a strong correlation, it is extremely rare for the C signal to be included in the Y signal.

Thirdly, the sample point ◎ and the sample point ・
If we consider YC separation by calculating
I get a signal. Figure 8, like Figures 5 to 7, also shows the frequency space in which the Y signal and C signal exist, obtained by calculation between the sample point of interest and the sample point(s). Although the C signal is included in a part of the separated Y signal, it is extremely rare that the C signal is included in the Y signal for the same reason as in the case of FIG.

In order to adaptively switch and control the three types of inter-field YC separation as described above, the sample point of interest ◎ and sample point ・(a)
It is necessary to detect the correlation between (b) and (t). What is digitized is the ■ signal, so in order to detect the correlation, each difference is passed through an LPF and the low frequency component of the Y signal is used, and in order to remove isolated points, the sample points of the n+1 field are used.・Compare the correlation information of (1) (e) (force) with the sample point of n-1 field (a) (b) (tsu) and correct the correlation information of the sample point of interest I know it's good.

The intra-frame YC separation circuit (48) shown in Figure 2 realizes the basic concept of motion adaptive YC separation as described above.
Next, this intra-frame YC separation circuit (48)
Explain the operation.

In FIG. 2, a V signal (101) input from input 1 (11) is delayed by 262 lines by a 262H delay device (14), and delayed by 2 pixels by a 2D delay device (18). v delayed by the 262H delay device (14)
The fR signal is further compensated for delay by a 263H delay device (15).

Next, the delay-compensated ■signal is transferred to a 2D delay device (22
) and 262H delay device (16), the output of the 2D delay device (22) is added to the output of the IH delay device (26) in the adder (28), and the output of the 2D delay device (26) is added to the output of the IH delay device (26).
) performs intra-field YC separation using the sum between the sample point ◎ of interest and the sample point (a), and outputs a Y signal.

Also, the output of the 262H delay device (16) is output from the adder (2
9), it is added to the output of the 2D delay device (22), and the first inter-field YC separation is performed by the sum between the sample point ◎ of interest and the sample point (A) in FIG. 4(B). Outputs Y signal. The output of the 262H delay device (16) is also input to a 2D delay device (17), and is further delayed by 4 pixels by the 2D delay device (23).

The output of the 2D delay device (22) and the output of the 2D delay device (23) are added in the adder (30), as shown in FIG. 4(B).
A second inter-field YC separation is performed using the sum between the sample point ◎ of interest and the sample point (a) in , and a Y signal is output.

Also, the output of the IH delay device (24) is sent to an adder (31).
At , it is added to the output of the 2D delay device (22), performs third inter-field YC separation, and outputs a Y signal.

The Y signals outputted by the above four types of YC separation are each input to a signal selection circuit (46), and are selected by the output of an isolated point removal circuit (45), which will be described later.

The output of the IH delay device (27) and the output of the 2D delay device (18) are subtracted in the subtracter (32), and the result is 2.1
It is passed through LPF (36) whose passband is below MHz, roughly converted into an absolute value by ABS (40), and then input to MIN (44), as shown in Fig. 4 (B). Detect the correlation between the sample point of interest ◎ and the sample point (a).

Also, the output of the 2D delay device (18) is the output of the 262H delay device (18).
4) and the subtracter (33), and the result is L P F (3
7), and after being roughly converted into an absolute value by A B S (41), it is manually input to M r N (44), and the fourth
The correlation between the sample point ◎ of interest in the diagram (B) and the sample point (A) is detected.

Also, the output of the 2D delay device (18) is the output of the 2D delay device (20).
The subtracter (34) subtracts the output of L P F (3B
), and after being roughly converted into absolute values by A B S (42), it is manually input to M I N (44), and the sample points of interest ◎ and sample points (A) in Figure 4 (B) are Detect the correlation between.

In addition, the output of the 2D delay device (18) is connected to the IH delay device (21).
is subtracted from the output of the subtracter (35), and the result is passed through the LPF (39), which has a passband of 2.1Hz or less, and is roughly converted into an absolute value by the ABS (43). 4 (B).
Detect the correlation between the sample point ◎ of interest and the sample point (tsu) at ).

Next, the M I N (44) selects the one with the smallest absolute value output from the four types of absolute value outputs, that is, the one with the largest correlation detection amount, and is further corrected by the isolated point removal circuit (45).

This isolated point removal circuit (45) selects the output of the filter in the direction with the highest correlation based on the correlation determination result after removing the isolated points, and selects the output for YC within the frame! ! tY output (
112).

Note that the 2D delay device (25) performs a two-pixel delay for delay compensation, and the subtracter (47) performs intra-frame YC separation Y.
Subtract the signal and get YC in the frame! IC signal (113)
Output.

Next, the operation of the isolated point removal circuit (45) will be explained.

In FIG. 3, the correlation detection signal (114) input from the terminal (49) is delayed by one frame.
The signal (e) and the signal (a) delayed by one line and four pixels are input to the comparison circuit (60). (7) The comparison circuit (60) determines whether the sampling point of (a) is correlated with the sampling point of the n-2 field in the lower left direction of Figure 4 CB), and the sampling point of (e) If there is a correlation with the sample point of interest in field n, it is determined that the sample point of interest in field n has a correlation with the sample point (a) of field n-1, and the correlation detection result of the sample point of interest is corrected.

In addition, the signal (power) delayed by 1 frame and 4 pixels, and 1
The signal (2) delayed by one line is the comparator circuit (61)
is input. This comparator circuit (61) compares the sample point (
) is in the lower right direction of Figure 4(B), and there is a correlation with the sample point of the n-2 field, and the sample point (force) is correlated with the sample point of interest in the n field, then the n field It is determined that the sample point of interest has a correlation with the sample point(s) of the n-1 field, and the correlation detection result of the sample point of interest is corrected.

Also, a signal delayed by 1 frame, 1 line, and 2 pixels (
1) and the two-pixel delayed signal (A) are sent to the comparator circuit (62
) is done manually. This comparator circuit (62) detects if the sample point (A) is directly above FIG. If there is a correlation with the sample point of interest, it is determined that the sample point of interest in the n field has a correlation with the sample point (A) in the n-1 field, and the correlation detection result of the sample point of interest is corrected.

In all the above comparison circuits (60) to (62),
If no correction is made, the selection circuit (63) is controlled so that the correlation detection result of the sample point of interest is output as is, and if two or more corrections are made, one of the corrections is given priority. Such control is performed.

[Effects of the Invention] As described above, according to the present invention, it is possible to always perform optimal YC separation by utilizing image correlation in video processing. Even for images that are frequently switched, the present invention has the advantage that image quality deterioration such as cross color and dot interference is small, and YC separation can be performed with high resolution.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a motion adaptive YC separation filter according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the detailed configuration of an intra-frame YC separation circuit according to an embodiment of the invention. FIG. 3 is a block diagram showing a detailed configuration of an isolated point removal circuit according to an embodiment of the present invention, and FIG. 4 shows an array of V signals digitized at four times the color subcarrier in three-dimensional space-time. Figure 5 is a diagram showing the spectral distribution of the V signal in three-dimensional frequency space, Figure 6 is a diagram showing the spectral distribution of the V signal in a three-dimensional frequency space.
The figure shows the spectral distribution of the Y signal and C signal obtained by the first interfield YC separation on a three-dimensional frequency space, and FIG. 7 shows the Y signal and C signal obtained by the second interfield YC separation. FIG. 8 is a diagram showing the spectral distribution of the signal on a three-dimensional frequency space. FIG. is a block diagram showing the configuration of a conventional motion adaptive YC separation filter, FIG. 10 is a block diagram showing a configuration example of a conventional C signal motion detection circuit, and FIG. 11 is a block diagram showing a configuration example of a conventional C signal motion detection circuit. FIG. 12 is a block diagram showing a configuration example of a conventional Y signal motion detection circuit, and FIG. 13 is a block diagram showing a detailed configuration example of the interframe YC separation circuit of FIG. 9. , FIG. 14 is a block diagram showing a detailed configuration example of the intra-field YC separation circuit of FIG. 9. (1)...V signal input terminal, (2)...Y signal output terminal, (3)...C signal output terminal, (5)...interframe YC separation circuit, (6)...・Y signal motion detection circuit, (7
)...C signal motion detection circuit, <8)...Synthesis circuit,
(9)...Y signal mixing circuit, (lO)...C signal mixing circuit, (45)...isolated point removal circuit, (48)...
- Intra-frame YC separation circuit, (92)--motion detection circuit. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] (1) In a filter that separates the luminance signal and chrominance signal from a composite color television signal in which the chrominance signal is frequency-multiplexed into the high frequency region of the luminance signal, local image movement is detected using the correlation between frames. an interframe separation filter that performs interframe processing to separate luminance signals and color signals based on the detection results of the motion detection circuit; An intra-frame correlation detection circuit that detects correlation locally, and a nearby pixel when the pixel of interest is determined to be an isolated point from the detection results of the pixel of interest and its neighboring pixels between adjacent fields by the intra-frame correlation detection circuit. an isolated point removal circuit that replaces the results of the isolated point removal circuit; an interfield separation filter that performs interfield processing to separate luminance signals and color signals based on the judgment results of the isolated point removal circuit; an in-field separation filter that performs in-field processing to separate luminance signals and color signals;
A motion-adaptive luminance signal/color signal separation filter comprising means for adaptively controlling the output of the inter-field separation filter and the output of the intra-field separation filter.