JPH03243089A - Movement adaptive type brightness signal/chrominance signal separating filter - Google Patents

Abstract

PURPOSE:To obtain high resolution even from a multi-switched image and to reduce the deterioration of picture quality by preparing an intra-frame brightness signal (Y)/chrominance signal (C) separator circuit, and at the time of detecting a moving image, executing YC separation in the field only when there is no correlation between plural frames. CONSTITUTION:Even when a movement detecting circuit decides a moving circuit, the intra-frame YC separator circuit executes YC separation between plural fields when correlation between the frames is large. Only when there is no correlation between the fields, the intra-frame YC separator circuit executes YC separation in the field and outputs an intra-frame YC separated Y signal 112 and an intra-frame YC separated C signal 113. Namely, a minimum value selecting circuit 39 detects values having the most strong correlation out of four inputted absolute values to control a selection circuit 38. When respective outputs of absolute value circuits 34 to 37 are minimum, the circuit 38 respectively selects the outputs of adds 26 to 29 and outputs an intra-frame YC separated Y signal 112. A subtractor 40 subtracts the signal 112 from the output of a 2-picture element delay 18 and outputs the signal 113.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention provides a method for converting a luminance signal ( The present invention relates to a motion adaptive luminance signal/chrominance signal separation filter for separating a chrominance signal (hereinafter referred to as a "Y signal" or simply "Y") and a chrominance signal (hereinafter referred to as a "C signal" or simply rC,1).

[Prior Art] A motion adaptive YC separation 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 composite signal is obtained by frequency multiplexing the C signal into the high frequency region of the Y signal. For this reason, YC separation is required in the receiver, and incomplete separation causes image quality deterioration such as cross color and dot crawl.

In order to improve such image quality deterioration, in recent years, a delay circuit (hereinafter simply referred to as "delay circuit J Various signal processing circuits have been proposed for improving image quality, such as motion adaptive VC separation.

FIG. 8 is a block circuit diagram showing an example of a conventional motion adaptive YC separation filter. In FIG. 8, an NTSC signal 101 is input to an input terminal 1, an intra-field YC separation circuit 4, an inter-frame VC separation circuit 5.
The signal is applied to the input terminals of the Y signal motion detection circuit 6 and the C signal motion detection circuit 7, respectively.

An intra-field YC NY signal 102 separated by YC by an intra-field filter (not shown) in the intra-field YC separation circuit 4 and an intra-field YC separated C signal 103 are respectively connected to the first input terminal of the Y signal mixing circuit 9 and the C signal. It is input to the first input terminal of the signal mixing circuit 1°.

Further, the interframe YC separated Y signal 104 and the interframe YC separated 1iiiC signal 105, which are YC separated by an interframe filter (not shown) in the interframe YC separation circuit 5, are connected to the second input terminal of the Y signal mixing circuit 9, respectively. It is input to the second input terminal of the C signal mixing circuit 1o.

On the other hand, the Y signal motion amount 106 detected by the Y signal motion detection circuit 6 is input to one input terminal of the synthesis circuit 8, and a signal indicating the C signal motion amount detected by the C signal motion detection circuit 7 is inputted to one input terminal of the synthesis circuit 8. 107 is input to the other input terminal of the synthesis circuit 8.

The motion detection signal 108 synthesized by the synthesis circuit 8 is input to the third input terminal of the Y signal mixing circuit 9 and the second input terminal of the C signal mixing circuit 10, respectively.

And this Y signal motion detection circuit 6. The C signal motion detection circuit 7 and the synthesis circuit 8 constitute a motion detection circuit 80.

A motion adaptive YCC separation multiplied signal 09, which is an output of the Y signal mixing circuit 9, is sent out from the output terminal 2.

Further, a motion adaptive VC separated C signal 110 which is an output of the C signal mixing circuit 10 is sent out from the output terminal 3.

Next, the operation of this conventional example will be explained. The motion detection circuit 80 synthesizes the outputs of the Y signal motion detection circuit 6 and the C signal motion detection circuit 7 in the synthesizing circuit 8 in order to separate the signal 101 into Y and C signals. or a signal indicating movement.

The Y signal motion detection circuit 6 inputs the ■ signal 101 from the input terminal 51 as shown in FIG.
The subtracter 54 subtracts the signal delayed by one frame in step 3 and the directly input signal 101, and the signal 1 of the signal 101 is
Find the frame difference, and use a low-pass filter (hereinafter referred to as rLP).
After passing through 55 (referred to as FJ), its absolute value is determined by an absolute value circuit 56, and this absolute value is converted by a non-linear conversion circuit 57 into a signal 106 indicating the amount of movement of the low frequency component of the Y signal, which is sent to the output terminal 52. Output.

In addition, the C signal motion detection circuit 7 receives a signal obtained by delaying the signal 1°1 input from the input terminal 11 by 2 frames by a 2 frame delay circuit 41, and a signal directly input as shown in FIG. 10, for example. ■The subtracter 42 subtracts the signal 101 to obtain a two-frame difference, which passes through a band pass frame (hereinafter referred to as rBPF) 43, then the absolute value is obtained by an absolute value circuit 44, and this absolute value is converted into a signal 107 indicating the amount of motion of the C signal by the nonlinear conversion circuit 45, and outputted from the output terminal 49.

The synthesis circuit 8 is configured to select and output the larger value of the Y signal motion amount 106 and the C signal motion amount 1107, for example.

This 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=o, and if the image is determined to be a completely moving image, then k = o. The control signal 10 is given to the Y signal mixing circuit 9 and the C signal mixing circuit 10 such that 1=1.

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

The inter-frame YC separation circuit 5 adds the signal 101 inputted from the input terminal 61 as shown in FIG. The YF signal 104 is extracted and outputted to the output terminal 62 by adding the YF signal 104 to the output terminal 62, and the subtracter 66 subtracts the YF signal 104 from the C
The f signal 105 is extracted and output from the output terminal 63.

Further, in general, when the image is a moving image, intra-field YC separation using intra-field correlation is performed to separate the Y signal and the C signal. The in-field YC separation circuit 4 is
For example, as shown in FIG. 12, the adder 75 adds the ■ signal 101 input from the input terminal 71 delayed by one line in the one-line delay circuit 74 and the directly input ■ signal 101 to obtain a one-line sum. The Yf signal 102 is extracted and outputted from the output terminal 72, and the subtracter 76 extracts the Yf signal 102 from the input terminal 71.
The Cf signal 103 is extracted by subtracting the Yf signal 102 from the ■ signal 101 inputted from the output terminal 73 and output from the output terminal 73.

In the motion adaptive YC separation filter, such an intra-field YC separation circuit 4 and an inter-frame YC separation circuit 5 are arranged side by side, and the motion coefficient k synthesized by the synthesis circuit 8 is used to send the Y signal mixing circuit 9 as follows. Motion adaptation Y by performing calculations
A C minute NY signal 109 is output from the output terminal 2.

Y=kYf+(1-k)YF where, Yf: Intra-field VC separation Y signal output 102YF: Inter-frame YC minute! 1iiY signal output 104.

Similarly, the control signal 108 causes the C signal mixing circuit 10 to perform the following calculation to generate the motion adaptive YC separated C signal 11.
0 is output from output terminal 3.

C=kCf+ (C-k)CF where: Cf: Intra-field YC separated C signal output 103CF: Interframe YC separated C signal output 105.

Of this motion adaptive YC separation filter, the C signal motion detection circuit 107 can also be realized with a configuration as shown in FIG.

In FIG. 13, a signal 101 is input from the input terminal 11, and the color demodulation circuit 46 generates two types of color difference signals R-
It is demodulated into Y and B-Y.

These two types of color difference signals R-Y and B-Y are time-division multiplexed at a certain frequency in a time-division multiplexing circuit 47, delayed by two frames in a two-frame delay circuit 41, and then
A two-frame difference is obtained by subtracting the output of the frame delay circuit 41 and the output of the time division multiplexing circuit 47.

This two-frame difference is passed through an LPF 4B to remove the Y signal component, the absolute value is taken by an absolute value circuit 44, and the nonlinear conversion circuit 45 performs nonlinear conversion to obtain the motion detection amount of the C signal.
07 can be sent out from the output end 49.

[Problem to be solved by the invention]

Since the conventional motion adaptive YC separation filter is configured as described above, the in-field YC separation filter is Yf by separation circuit 4
The double signal Cf signal, and the YF signal and Cf signal from the interframe YC separation circuit 5 are mixed.

Therefore, since the filter characteristics for still images and those for moving images are completely different, there is an extreme change in resolution when moving from a still image to a moving image, or from a moving image to a still image. There was a problem in that the image quality was noticeably degraded.

This invention was made in order to solve the above-mentioned problems, and it provides a motion-adaptive luminance signal that can reproduce images with high resolution and little image quality deterioration even when the above-mentioned processing is changed frequently. The purpose is to obtain a color signal separation filter.

[Means to solve the problem]

The motion adaptive luminance signal/chrominance signal separation filter according to the present invention, when a motion detection circuit detects a moving image, locally detects the correlation between frames or within a field, and performs interfield processing based on the detection result to frame the frame. Inner YC #
This is provided with an intra-frame VC separation circuit that outputs a Y signal and an intra-frame YC separated C signal.

[Effect]

The intra-frame YC separation circuit in this invention performs YC separation between fields even if the motion detection circuit determines that it is a moving image, if the correlation between fields is large, and performs YC separation within the field only when there is no correlation between fields. Then, an intra-frame YC separated MY signal and an intra-frame YC separated C signal are output.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a motion adaptive luminance signal/chrominance signal separation filter according to an embodiment of the present invention.
In the figure, only the intra-field YC separation circuit 4 in FIG. 8 is replaced with an intra-frame YC separation circuit 50, and therefore explanations of the configuration and operation of the other parts will be omitted.

A detailed block diagram of the intra-frame YC separation circuit 50 in FIG. 1 is shown in FIG.

In FIG. 2, a ■ signal 101 is input to the input terminal 11. In FIG. 15.19 is a 262 line delayer, 14
．． 17, 20, and 23 are one-line delay devices. Also, 1
6, 18, 22.25 are 2 pixel delay devices, 21.2
4 is a 4-pixel delay device. 26, 27, 28, and 29 are adders, and 30, 31, 32, and 33, 40 are subtracters.

34, 35 and 36, 37 are absolute value circuits that output absolute values. Further, 38 is a selection circuit that outputs one of the four inputs according to the control signal, and 39 is a minimum value circuit that determines the minimum value of the four inputs and outputs the control signal. The output of the selection circuit 38 is outputted from the output terminal 12 as an intra-frame YC separated Y signal 112, and is also outputted from the subtracter 40.
The output is output from the output terminal 13 as an intra-frame YC separated C signal 113.

Next, the operation will be explained. If we take the horizontal direction of the screen as the X axis, the vertical direction of the screen as the y axis, and the time axis as the t axis in the direction perpendicular to the plane composed of the X and y axes, then It is possible to think about the three-dimensional space-time that is constructed.

Figure 3 is a diagram representing three-dimensional space-time, and Figure 3 (a)
is a plane composed of the t-axis and the y-axis, Fig. 3(b).

(C) is a plane composed of the X axis and the y axis.

FIG. 3(a) also shows increment scanning lines, and the dashed line indicates one field.

Moreover, the solid line and the broken line in FIG. 3(b) indicate n fields, n
-1 field scanning lines are shown, and the solid lines and broken lines in FIG. 3(C) are the n+1 field and n field scanning lines. "○" on the scanning line.

The four types of marks "・", "Δ", and "Mu" indicate sample points where the color subcarrier is in phase when the signal is digitized at four times the color subcarrier frequency fsc (=3.58MHz). It represents.

Now, if the sample point of interest is represented by "◎", in field n, which is the same field, it will be around 2 sample points and 4 points above and below 1 line.
At points a, b, c, and d, the color subcarrier phase is 180°.
It's different.

Therefore, a line comb filter using a digital circuit or an adaptive Y
A C separation filter etc. can be configured.

Further, as shown in FIG. 3(a), since the color subcarrier phases differ by 180 degrees at the same sample point one frame apart, an interframe YC separation filter can also be configured.

Furthermore, as shown in Fig. 3, etc., from the sample point of interest,
In the n-1 field before the field, the sample point on one line or the two sample points on the line below are in opposite phase, so the inter-field YC separation is performed between one of these three points A, B, and the point of interest. becomes possible.

In addition, as frequency axes corresponding to the above X-axis, μ-axis, and t-axis, the μ-axis is a horizontal frequency axis, and μ is a vertical frequency axis.
Considering the axis and the f-axis, which is the time frequency, μ which is orthogonal to each other
A three-dimensional frequency space can be considered that can be composed of an axis, a cy axis, and an r axis.

FIG. 4 shows a projection diagram of the three-dimensional frequency space.

FIG. 4(a) is a diagram of the three-dimensional frequency space viewed from an oblique direction, FIG. 4(b) is a diagram of the three-dimensional frequency space viewed from the negative direction of the f-axis, and FIG. 4(C) is a diagram of the above three-dimensional frequency space viewed from the positive direction of the μ axis. This figure 4 (a
) to FIG. 4(C) also represent the spectral distribution of the ■ signal on the three-dimensional frequency space.

As can be seen from Figures 4(a) to 4(C), the spectrum of the Y signal is wide centered around the origin of the three-dimensional frequency space, and the spectrum of the C signal is based on the color subcarrier frequency fsc.
Since the ■ signal and the Q signal are quadrature two-phase modulated, the fourth
They are located in four spaces as shown in Figures (a) to 4(C).

However, when the ■ signal is viewed on the μ axis as shown in FIG. 4(C), the C signal exists only in the second and fourth quadrants. This corresponds to the fact that the solid line representing the same phase of the color subcarriers rises with time in FIG. 3(b).

Nevertheless, in the conventional example, when detecting image movement, YC separation was performed using correlation within the field, so band limitation in the μ-axis and cy-axis directions is possible, but it is possible to limit the band in the f-axis direction. It was not possible to add bandwidth restrictions. Therefore, the frequency space in which the Y signal originally exists is separated as the C signal, and the band of the Y signal in the moving image becomes narrow. Therefore, by performing YC separation using inter-field processing as described above, the band of the Y signal in a moving image can be expanded.

In FIG. 3(b), in the n-1 field, there are two sample points A, B, and A, which are in the vicinity of the sample point of interest "◎" and whose color subcarrier phases differ by 180 degrees. Inter-field YC separation is possible by calculation with any of these three points.

First, consider YC separation by calculation between the sample point of interest "◎" and the sample point "." A in FIG. 3(b).

The Y signal is obtained by the sum of these two sample points, and the C signal is obtained by the difference.

Figures 5(a) to 5(C) are shown in Figures 4(a) to 4(C).
Like C), it represents a three-dimensional frequency space, and shows the frequency space in which the Y signal and C signal obtained by the calculation between the sample point of interest and sample point A exist.

Second, if we consider YC separation by calculating the sample point ``◎'' of interest and the sample point ``I'' in Figure 3(b), the Y signal is obtained by the sum of these two sample points, and the Y signal is obtained by the difference. A C signal is obtained.

Similarly, FIGS. 6(a) to 6(C) also show the frequency space where the Y signal and C signal exist, which are obtained by calculation between the sample point of interest and the sample point A. Figure 6(a) to Figure 6(C)
It appears that some C signals are included in the separated Y signal, but since the Y signal and C signal have a strong correlation,
It is extremely rare for a signal to include a C signal.

Thirdly, if we consider YC separation by calculating the sample point ``◎'' of interest and the sample point ``・'' in Figure 3(b), 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.

Similarly, FIGS. 7(a) to 7(C) also show the frequency space where the Y signal and C signal exist, which are obtained by calculation between the sample point of interest and the sample point.

Looking at Figures 7(a) to 7(C), it appears that some C signals are included in the separated Y signal, but in Figure 6(a)
For the same reason as shown in FIG. 6(C), it is extremely rare for the Y signal to include the C signal.

In order to adaptively switch and control these three types of inter-field YC separation, the sample point of interest ``◎'', the sample point ``・'' A,
It is necessary to detect the correlation between

In FIG. 3(b), the correlation between the sample point of interest and the sample point A of the n-1 field is detected by the absolute value of the difference between the sample point of the n+l field and the sample point A in FIG. 3(C). Similarly, the correlation between the sample point of interest and the sample point A of the n-1 field is detected by the absolute value of the difference between the sample point O and the sample point I of the n+1 field in FIG. 3(C).

Further, the correlation between the sample point of interest and one sample point of field n-1 is detected by the absolute value of the difference between the sample point power of field n+1 and one sample point in FIG. 3(C).

When performing intra-field processing, correlations are detected within the field. At this time, the correlation between the sample point of interest and sample point a in FIG. 3(b) is detected by the absolute value of the difference between sample point a and sample point S. By comparing these absolute difference values, the direction with the strongest correlation can be detected.

Next, the operation of the intra-frame YC separation circuit having the configuration shown in FIG. 2 will be explained. The present invention is characterized in that when the motion detection circuit 80 determines that the image is a moving image, the optimum one of three types of inter-field YC separation or intra-field YC separation is used as moving image processing. In FIG. 2, the V signal input from the input terminal 11 is transmitted to a 262-line delay device 15, a 1-line delay device 17, and a 2-pixel delay device 1.
8 causes a delay of 263 lines and 2 pixels.

Furthermore, the signal delayed by one line by the l-line delay device 23 is added by the adder 26, and by performing calculations between the sample point of interest and the sample point a in FIG. Output.

■The output of the line delay device 17 is delayed by 262 lines by the 262 line delay device 19, and added to the output of the 2-pixel delay RN 18 by the adder 27, and the calculation of the sample point of interest and the sample point in FIG. 3(b) is performed. Interfield YC by doing
Outputs a separated Y signal. The output of the 262-line delay device 19 is further delayed by 4 pixels in a 4-pixel delay device 24. This 4
The output of the pixel delay device 24 is added to the output of the two-pixel delay device 18 in the adder 28, and by performing calculations between the sample point of interest and the sample point A in FIG. Output. The output of the 262-line delay device 19 is delayed by 1 line and 2 pixels by a 1-line delay device 20 and a 2-pixel delay device 25. The output of the 2-pixel delay device 25 is added to the output of the 2-pixel delay device 18 in an adder 29, and the result is shown in FIG.
An inter-field YC separated Y signal is output by performing calculations between the sample point of interest and sample point A in . Furthermore, the ■ signal 101 inputted to the input terminal 11 is delayed by 262 lines and 2 pixels by the 262 line delay device 15 and the 2 pixel delay device 16. The output of the 2-pixel delay device 16 is sent to the l-line delay device 23.
The subtracter 30 subtracts the output of , and the difference between sample point A and sample point a in FIG. 3(b) is obtained.

The output of the subtracter 30 is converted into an absolute value by an absolute value circuit 34 and inputted to a minimum value circuit 39.

The (1) signal 101 inputted to the input terminal 11 is delayed by one line by the one-line delayer 14, and delayed by four pixels by the four-pixel delayer 21. The output of the 4-pixel delay device 21 is subtracted from the output of the 262-line delay device 19 by a subtracter 31, and the difference between the sample point power in FIG. 3C and the sample point power in FIG. The output of the subtracter 31 is converted into an absolute value by an absolute value circuit 35 and inputted to a minimum value circuit 39. The output of the l-line delay device 14 is subtracted from the output of the 4-pixel delay device 24 by a subtracter 32, and the sample point O in FIG. 3(C) and the sample point O in FIG.
) at sample point A is calculated. The output of the subtracter 32 is converted into an absolute value by an absolute value circuit 36, and then converted into an absolute value by a minimum value circuit 39.
is input. The signal 101 inputted to the input terminal 11 is delayed by two pixels by the two-pixel delay device 22. 2 pixel delay device 2
The output of 2 is subtracted from the output of the 2-pixel delay device 22 by a subtracter 33, and the difference between the sample point A in FIG. 3(C) and the sample point A in FIG. 3(b) is taken. The output of the subtracter 33 is converted into an absolute value by an absolute value circuit 37 and inputted to a minimum value circuit 39. The minimum value selection circuit 39 detects the one with the strongest correlation (the absolute difference value is the smallest) from the four input absolute difference values, outputs a control signal, and controls the selection circuit 38 .

That is, the selection circuit 38 selects the output of the adder 26 when the output of the absolute value circuit 34 is the minimum, the output of the adder 27 when the output of the absolute value circuit 35 is the minimum, and the output of the adder 27 when the output of the absolute value circuit 36 is the minimum. In this case, the output of the adder 28 is selected, and when the output of the absolute value circuit 37 is the minimum, the output of the adder 29 is selected as the intra-frame YCC separated multiplied signal 112. Subtractor 40
subtracts the intra-frame YC #Y signal 112 from the output of the 2-pixel delay device 18 and outputs the intra-frame YC separated C signal 1/3.

〔Effect of the invention〕

As described above, according to the motion adaptive luminance signal/chrominance signal separation filter according to the present invention, correlation between frames or within a field is locally detected in the intra-frame YC separation circuit when a motion detection circuit detects a moving image. If the correlation between frames is large, YC separation is performed between fields, and only when there is no correlation between frames, V is separated within the field.
Since the configuration is configured to perform C separation, optimal YC separation can be performed using image correlation in video processing using a motion adaptive YC separation filter, and YC separation with less image quality deterioration such as cross color and dot interference can be performed even in videos. This has the effect of configuring a motion adaptive YC separation filter that performs the following.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a motion adaptive YC separation filter according to an embodiment of the present invention, FIG. 2 is a block diagram showing a detailed configuration of an intra-frame YC separation circuit in the same embodiment, and FIG. 3(a) 3(b) and 3(C) are plan views configuring the array of ■signals digitized four times as much as the color subcarrier in the three-dimensional time space on the L and y axes. Plan view consisting of axis and y axis, Fig. 4(a)
Figure 4 (b) is a diagram of the spectral distribution of the ■ signal in three-dimensional frequency space viewed from an oblique direction, Figure 4 (b) is a diagram of the same spectrum distribution seen from the negative direction of the f-axis, and Figure 4 (C) is the same spectrum as above. A diagram of the distribution viewed from the positive direction of the μ axis, Figure 5 (a
) is a diagram of the spectral distribution of the Y signal and C signal obtained by the first interfield YC separation according to the present invention, viewed from an oblique direction on a three-dimensional frequency space, and FIG. 5(b) shows the same spectral distribution as f FIG. 5(C) is a diagram of the same spectrum distribution as seen from the positive direction of the μ-axis, and FIG. 6(a) is a diagram of the spectral distribution obtained by the second inter-field YC separation according to the present invention. Figure 6(b) is a diagram of the spectral distribution of the Y signal and C signal seen from an oblique direction on a three-dimensional frequency space. )
7(a) is a diagram showing the spectral distribution of the above as seen from the positive direction of the μ axis, and FIG. Figure 7 (C
) is a diagram of the same spectrum distribution as seen from the positive direction of the μ axis, Figure 8 is a block diagram of a conventional motion adaptive YC separation filter, and Figure 9 is a diagram showing the Y signal movement in the motion adaptive YC separation filter of Figure 8. A block diagram showing the detailed configuration of the detection circuit,
FIG. 10 is a block diagram showing the detailed configuration of the C signal motion detection circuit in the motion adaptive YC separation filter of FIG. 8;
11 is a block diagram showing the detailed configuration of the interframe YC separation circuit in the motion adaptive YC separation filter of FIG. 8, and FIG. 12 is a block diagram showing the intrafield YC separation circuit of the motion adaptive YC separation filter of FIG. 8. FIG. 13 is a block diagram showing another example of the conventional C signal motion detection circuit. In the figure, 5 is an interframe YC separation circuit, 6 is a Y signal motion detection circuit, 7 is a C signal motion detection circuit, 8 is a synthesis circuit, 9 is a Y signal mixing circuit, 10 is a C signal mixing circuit, and 50 is an intraframe YC separation circuit 80 is a motion detection circuit. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) In a circuit 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, the correlation between frames is used to locally detect image movement. A motion detection circuit detects a still image, and when this motion detection circuit detects a still image, it separates an interframe luminance signal and a color signal using interframe correlation to generate an interframe luminance signal, a chrominance signal, a separated luminance signal, and an interframe luminance signal. Signal color signal separation An interframe luminance signal/color signal separation circuit that outputs a color signal, and when the motion detection circuit detects a moving image, locally detects the correlation between frames or within a field, and uses the detection result to detect the correlation between the fields. an intra-frame luminance signal/chrominance signal separation circuit that performs processing or intra-field processing and outputs an intra-frame luminance signal/color signal separated luminance signal and an intra-frame luminance signal/chrominance signal separated color signal; a luminance signal mixing circuit that mixes the inter-frame luminance signal chrominance signal separated luminance signal and the intra-frame luminance signal chrominance signal separated luminance signal to output a motion-adaptive luminance signal chrominance signal separated luminance signal; A motion characterized by comprising a color signal mixing circuit that mixes the inter-frame luminance signal, chrominance signal, and separated color signal and the intra-frame luminance, chrominance, and separated color signals to output a motion-adaptive luminance, chrominance, and separated chrominance signal. Adaptive luminance signal chrominance signal separation filter.