JP3064295B2 - Motion adaptive signal processing circuit and television receiver - Google Patents

Description

The present invention relates to a television signal processing circuit, and in particular, can switch between still image processing and moving image processing without a sense of incongruity, and can produce high-quality images. The present invention relates to a motion-adaptive signal processing circuit and a television receiver suitable for obtaining.

[Conventional technology]

There is a technique in which interlaced scanning performed in the NTSC system is interpolated into scanning lines on the receiver side, sequentially converted into scanning signals, and displayed. Using field memory, one field
Create an interpolation scanning line signal using the scanning line signal before the
If the image is converted into progressive scan and displayed, line flicker occurring at the edge of the horizontal line can be removed, and the vertical resolution can be improved. However, this inter-field interpolation has a great effect on a still image, but has a great effect on a moving image such as a comb-shaped double image.

On the other hand, the motion of the image is detected based on, for example, the difference signal between one frame.
Inter-field interpolation is performed, and when the motion of the image is large, a motion-adaptive type process can be considered in which an interpolated scanning line signal is created using the scanning line signal in the transmitted field. Also in this case, since motion is detected between frames,
In some cases, it is difficult to detect a fast motion of an image such as moving between fields.

In the conventional example of the present inventors as disclosed in Japanese Patent Application Laid-Open No. 60-250912, the motion of an image is detected on the basis of a frame difference signal of a color television signal, and the detected motion signal is A control motion signal is obtained by performing spatio-temporal processing using a flash memory, and the motion adaptive signal processing circuit is controlled by the control motion signal. By using such a control motion signal, it is possible to prevent an erroneous detection of a fast motion of an image moving between fields.

The configuration of this conventional example will be briefly described with reference to FIG. 8th
In the figure, 101 is an input terminal, 102, 103 and 115 are field memories, 104 and 107 are addition circuits, 105, 108 and 118 are coefficient circuits, 10
6, 116 are line memories, 109 is a motion detection circuit, 110 is a subtraction circuit, 111 is an absolute value circuit, 112 is a conversion circuit, 113 is a spatio-temporal processing circuit, 114 and 117 are maximum value circuits, 119 is a mixing circuit, and 120 is a double speed conversion circuit. , 121 are output terminals.

An interface scanning television signal input from an input terminal 101 is applied to a first field memory 102 and input to an adder circuit 104, where it is input to a second field.
By obtaining an average value with the output signal of the field memory 103, an inter-field interpolation scanning line signal for still image processing is obtained as an output of the coefficient circuit 105.

The output signal of the first field memory 102 is supplied to the second field memory 103 and is also input to the first line memory 106. -An interpolated scanning line signal is obtained.

On the other hand, the input signal from the input terminal 101 and the second
The output signal of the field memory 103 and the subtraction circuit 110 are supplied to obtain a difference between frames of the television signal. The absolute value of the difference between the frames is obtained by an absolute value circuit 111 and supplied to a conversion circuit 112 to obtain a detected motion signal.

The first maximum value circuit 114 stores the detected motion signal and the output signal of the first maximum value circuit 114 in a first field memory 115, a second
Line memory 116, second maximum value circuit 117, coefficient circuit 118
, Then α times (0 <
The maximum value of the signal with α <1) is obtained, and a control motion signal is output.

The mixing circuit 119 is connected to the output signal of the coefficient circuit 105 and the coefficient circuit 10.
8 and input and mix and output. On this occasion,
The mixing ratio is controlled by the control motion signal.

The double-speed conversion circuit 120 inputs the output signal of the second line memory 106 as an actual scanning line signal and the output signal of the mixing circuit 119 as an interpolation scanning line signal. By switching and outputting the scanning line / interpolated scanning line, the signal is converted into a signal for sequential scanning.

[Problems to be solved by the invention]

The characteristics of the spatiotemporal processing circuit 113 and the mixing circuit 119 in the above conventional example will be described with reference to FIGS. 9 to 11. FIG. The motion signal is 4 bits and the coefficient α of the coefficient circuit 108 is
Is described as about 0.9.

Since the motion signal is a 4-bit digital signal, α = 0.9 can be approximated by the characteristic of subtracting one from the input signal, and the horizontal axis represents time (the number of fields) and the vertical axis represents the control motion signal. This is shown in FIG. By this control motion signal, the mixing ratio of the mixing circuit 119 is controlled, for example, as shown in FIG. Accordingly, when the number of fields is plotted on the horizontal axis, the mixture ratio is expressed as shown in FIG.

As described above, in this conventional example, the motion detection error is corrected by extending the motion signal that has been detected once in the spatiotemporal direction. However, as can be seen from FIG. 11, after 8 fields or more, the ratio of the still image processing signal is more than half. Therefore, at this point, it is considered that there is not much effect of correcting the still image processing performed on the moving image.

Therefore, in the above-mentioned conventional example, the attenuation in the spatiotemporal processing circuit 113 has to be reduced in order to obtain a sufficient effect of correcting a motion detection error. For this reason, if a motion is erroneously detected due to the influence of noise or the like, the motion signal is attenuated and spreads over 10 fields or more, which may result in an unnatural image. Was.

The present invention has been made in view of the above problems, and a first object of the present invention is to make it possible to obtain a sufficient effect of correcting a motion detection error without excessively expanding a motion signal in a spatiotemporal direction. Aim.

A second object of the present invention is to obtain a non-linear mixed circuit having a small circuit size and not requiring a complicated circuit configuration to obtain the above non-linear mixed characteristics.

[Means for solving the problem]

 The above object is achieved by the following means.

The first object is that a control motion signal obtained by performing a process of extending a detected motion signal in a spatio-temporal direction (ie, a process of attenuating the detected motion signal over a plurality of fields), that is, a control motion signal obtained by performing a so-called spatio-temporal process. When the value is equal to or greater than the value, the mixing circuit that mixes the still image processing signal and the moving image processing signal outputs only the moving image processing signal, so that the mixing circuit is a non-linear mixing circuit having nonlinear characteristics. It is assumed that.

That is, the non-linear mixing circuit sets the still image processing signal to X, the moving image processing signal to Y, and the mixing ratio to M (0 ≦ M ≦
1) When the mixing process is performed according to M (Y−X) + X, when the control motion signal is equal to or more than a predetermined value (if the control motion signal is represented by 4 bits, the control motion signal (When it is in the range of 8 to 15), the mixture ratio M is controlled to be 1.

Further, the second object is to provide the nonlinear mixing circuit with a bit shift obtained by sequentially shifting a signal obtained by subtracting the moving image processing signal and the still image processing signal upward or downward. A plurality of addition circuits each adding a plurality of signals having different magnitudes, and an addition control circuit controlling each of addition or stop of addition by the plurality of addition circuits by a signal of each bit of the control motion signal. This is achieved by providing a nonlinear coefficient circuit.

[Action]

The motion detecting circuit calculates a detected motion signal based on the inter-frame difference signal of the image. At this time, when the difference signal is smaller than a predetermined value, it is determined that the image is a still image. When the difference signal is large, it is determined that there is a motion, and a detected motion signal is output.

The spatio-temporal processing circuit receives the detected motion signal, performs horizontal / vertical / temporal processing, and outputs a control motion signal attenuated over a plurality of fields. At this time, when obtaining the motion of a certain pixel, by referring to the motion of surrounding pixels in the spatio-temporal direction, it is possible to prevent a mistake in detecting a fast motion of an image.

The non-linear mixing circuit inputs the still image processing signal and the moving image processing signal, and non-linearly mixes these two signals with respect to the control signal to output. At this time, if the control motion signal is larger than a predetermined value, the mixing ratio of the moving image processing signal is set to 1
When the control motion signal becomes smaller than a predetermined value, control is performed so that the mixture ratio approaches zero.

As described above, the pixel whose motion is detected once is processed as a moving image processing state for a while, and then rapidly returns to the still image processing. Therefore, without excessively increasing the time constant in the spatio-temporal processing circuit, A sufficient effect of correcting a detection error can be obtained. As a result, a high-quality motion-adaptive signal processing circuit can be realized.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIG. In FIG. 1, 1 is an input terminal, 2 is an analog / digital conversion circuit (hereinafter referred to as ADC), 3 is a frame memory, 4 is a line comb type filter circuit, 5 is a frame comb type filter circuit, and 6 is a frame comb type filter circuit. Motion detection circuit, 7 is a subtraction circuit, 8 is a low-pass filter circuit (hereinafter referred to as LPF), 9 is a clip circuit, 10 is an absolute value circuit, 11 is a conversion circuit, 12 is a spatio-temporal processing circuit, 13, 18 , 20 is the maximum value circuit, 14 is the horizontal processing circuit, 15, 24 is the coefficient circuit, 16, 25
Is a field memory, 17, 19, and 22 are line memories, 21, and 26 are non-linear mixing circuits, 23 is an addition circuit, 27 is a double-speed conversion circuit, 28 is a digital-analog conversion circuit (hereinafter, referred to as DAC), 29
Is an output terminal. Also, 30, 31, and 32 are signal paths,
For convenience of explanation, it is treated as a signal on a signal path.

In this embodiment, a color television signal of the NTSC system is input, and a motion adaptive luminance signal / color signal separation (hereinafter, YC
Separation) and motion adaptive scanning line interpolation
The operation will be described.

The color television signal input from input terminal 1 is AD
It is supplied to C2 and converted to a digital signal. According to the sampling theorem, the sampling frequency in the ADC 2 needs to be at least twice the frequency band of the television signal. For example, four times the color subcarrier fsc (about 14.3 MHz) is generally used. The television signal from ADC2 is
The television signal is delayed by one frame period of the television signal.

The line comb type filter circuit 4 receives the television signal from the ADC 2 and performs YC separation on the basis of vertical correlation in the same field. Frame comb type filter circuit 5
Inputs the input signal and the output signal of the frame memory 3, and performs YC separation based on the correlation between the frames.

The first nonlinear mixing circuit 21 receives the output signal of the line comb filter circuit 4 as a moving image processing signal and the output signal of the frame comb filter circuit 5 as a still image processing signal.
Is nonlinearly mixed and output by the control motion signal 31 of FIG.

The output signal of the first non-linear mixing circuit 21 is supplied to the third line memory 22 and the addition circuit 23, and the output signal of the addition circuit 23 is halved by the coefficient circuit 24. As a result, an average value of two continuous scanning line signals in the same field is obtained as an output of the coefficient circuit 24 as an interpolation scanning line signal for moving image processing.
This is supplied to one input of a second nonlinear mixing circuit 26.

Further, the output signal of the first nonlinear mixing circuit 21 is supplied to the second field memory 25, and is delayed by 263H (1H is one horizontal scanning cycle). The output signal of the second field memory 25 is supplied to the other input of the second nonlinear mixing circuit 26 as an interpolated scanning line signal for still image processing. The mixing ratio in the second non-linear mixing circuit 26 is non-linearly controlled by the second control motion signal 32.

The double-speed conversion circuit 27 inputs the output signal of the first nonlinear mixing circuit 21 as an actual scanning line signal and the output signal of the second nonlinear mixing circuit 26 as an interpolation scanning line signal, and after time-compressing the signal to 1/2, outputs By switching and outputting the actual scanning line / interpolated scanning line for each scanning line, the signal is converted into a signal for sequential scanning.

On the other hand, the subtraction circuit 7 receives the input signal and the output signal of the frame memory 3 and obtains a difference signal between the frames. Since the phase of the color subcarrier is inverted between frames,
The output signal of the subtraction circuit 7 includes information indicating the motion of the image and a color signal. Therefore, the output signal of the subtraction circuit 7 is changed to LP
By supplying the signal to the F8 and removing the color signal multiplexed in the high-frequency portion of the luminance signal, only the motion information is obtained in the output of the LPF8.

Incidentally, a television signal is generally quantized at 8 bits. On the other hand, the mixing ratio in the nonlinear mixing circuits 21 and 26 is 10
If the control is performed in the order of steps, the switching between the moving image and the still image can be performed sufficiently smoothly. Therefore, the motion signal only needs to be about 4 bits. FIG. 2 shows an example of the conversion characteristics between the motion information and the motion signal.

In this embodiment, before inputting the motion information to the conversion circuit 11,
By clipping to a predetermined value by the clip circuit 9 and obtaining its absolute value, the subsequent conversion circuit 11
Circuit size is reduced. For example, conversion circuit 11
Since the conversion characteristics greatly affect the performance of the motion-adaptive signal processing circuit, it is conceivable to use a ROM for ease of change.However, since the number of input addresses of this ROM can be reduced, the ROM capacity is Can be reduced.

Further, in this embodiment, the clipping circuit 9 is arranged at the subsequent stage of the LPF 8 to reduce the number of circuits.
After performing the normal filter processing, clipping is performed in order to prevent the possibility of exceeding the dynamic range by calculation. In the present embodiment, the circuit scale can be reduced by integrating the clip of the LPF and the clip circuit 9.

The detected motion signal 30 output from the conversion circuit 11 is then input to the spatiotemporal processing circuit 12, where a first control motion signal 31 and a second control motion signal 32 are created. Hereinafter, the operation of the spatio-temporal processing circuit 12 will be described.

The first maximum value circuit 13 receives the detected motion signal 30 and the output signal of the second maximum value circuit 18 and selects and outputs the larger one. The output signal of the first maximum value circuit 13 is input to the horizontal processing circuit 14, and the horizontal processing is performed to create a first control motion signal 31. Here the horizontal processing circuit 14
Operates so as to refer to the movement of surrounding pixels in the horizontal direction. For example, a circuit that calculates the average value of the motion signals of the adjacent pixels or the maximum value may be used.

The first control motion signal 31 is input to the coefficient circuit 15 and is supplied to the first field memory 16 after reducing a constant value.
Obtain a delayed signal. The output signal of the first field memory 16 is supplied to a first line memory 17 and a second maximum value circuit 18. The second maximum value circuit 18 is a first line memory.
The signal which is delayed by 263H output from 17 and the signal delayed by 262H output from the first field memory 16 is selected and output.

On the other hand, the output signal of the horizontal processing circuit 14 is supplied to a second line memory 19 and a third maximum value circuit 20. The third maximum value circuit 20 receives the output signal of the second line memory 19 and the output signal of the horizontal processing circuit 14, that is, the first control motion signal 31, and selects and outputs the larger one. Thus, the second control motion signal 32 is created.

Here, the constant value to be reduced in the coefficient circuit 15 is 2
Then, the relationship between the time (the number of fields) and the control motion signal by the spatiotemporal processing circuit 12 is as shown in FIG.

Next, a configuration example of the first and second nonlinear mixing circuits 21 and 26 will be described with reference to FIG. In FIG. 4, 34 is a subtraction circuit, 3
5 is a coefficient circuit, 36, 37, and 38 are gate circuits, 39, 40, and 42 are addition circuits, and 41 is a selection circuit.

In the embodiment shown in FIG. 4, the still image processing signal is X, the moving image processing signal is Y, and the mixing ratio of the moving image processing signal is M (0 ≦ M ≦
In the case of 1), the mixing of the moving image processing signal and the still image processing signal is performed by the equation (1). Further, in the present embodiment, the fact that Expression (1) can be expressed as Expression (2) is used, and only one coefficient circuit is used.

Output = M × moving image + (1-M) × still image (1) = M × (moving image−still image) + still image (2) In the subtraction circuit 34, the still image processing signal is subtracted from the moving image processing signal. The output is supplied to the coefficient circuit 35. The coefficient circuit 35 includes a selection circuit, a gate circuit, and an addition circuit. The output signal of the subtraction circuit 34 is supplied to one input of the selection circuit 41. On the other hand, a signal obtained by shifting the output signal of the subtraction circuit 34 to one bit lower, that is, a signal halved is supplied to the first gate circuit 36. Similarly, a signal obtained by shifting the output signal of the subtraction circuit 34 two bits lower and a signal obtained by shifting three bits lower are supplied to the second and third gate circuits 37 and 38, respectively. Here, the third gate circuit is turned on / off by the least significant bit of the control motion signal. Similarly, the second and first gate circuits are turned on and off by the second and third least significant bits of the control motion signal.

The adder circuit 39 is connected to the output signal of the third gate circuit 38 and the second output signal.
And the output signal of the gate circuit 37 is input and added. Further, the addition circuit 40 is connected to the output signal of the addition circuit 39 and the first gate.
The output signal of the gate circuit 36 is added and output. Adder circuit 40
Is supplied to the other input of the selection circuit 41.
The selection circuit 41 selects the output signal of the subtraction circuit 34 when the most significant bit of the control motion signal is 1, and selects the output signal of the addition circuit 40 when the most significant bit of the control motion signal is 0. Operate. After that, the output signal of the selection circuit 41 and the still image processing signal are added in the adding circuit 42, thereby obtaining a mixed output of the still image processing signal and the moving image processing signal.

Thus, in the present embodiment, the coefficient of the coefficient circuit 35 is set so as to change in nine steps from 0/8 to 8/8. This is because the coefficient that can be expressed by n / 8 can be easily realized by simply combining a bit-shifted signal of the input signal. For example, a coefficient of 3/8 can be realized by adding a signal obtained by shifting the input signal two bits lower and a signal obtained by shifting the input signal three bits lower.

Further, the coefficient circuit 35 in this embodiment uses each bit of the control motion signal as means for stopping addition of the bit-shifted signals of the input signal to each other, and gates the bit-shifted signals described above. Non-linear characteristics are obtained.

FIG. 5 shows a characteristic diagram in which the mixing ratio changes non-linearly by a 4-bit control motion signal. When the control motion signal is small and the most significant bit is 0, the mixing ratio of the mixing circuit changes linearly. On the other hand, when the control motion signal is 8 or more, the most significant bit is 1, and the mixing ratio is fixed at 1. As described above, in the present embodiment, a means for clipping before applying the control motion signal to the mixing circuit is not required, and a non-linear mixing characteristic can be realized with a simple circuit configuration.

FIG. 6 shows the relationship between the time (number of fields) and the mixing ratio in this embodiment. Compared with the characteristics of the time and the mixing ratio in the conventional example described in FIG. 11, the connection time is shortened by maintaining the mixing ratio at 1 when the elapsed time is short, and rapidly attenuating the latter half. . This allows
A sufficient effect of correcting a motion detection error is obtained without keeping the moving image state unnecessarily long.

As another means for realizing a nonlinear mixed circuit, RO
A method using M is conceivable. However, if the coefficient circuit 35 in FIG. 4 is constituted by a ROM, for example, the input signal is about 9 bits, the control signal is about 4 bits, and the output signal is about 9 bits, so that the capacity of the ROM is about 72 kbits. It can be understood that the circuit configuration of this embodiment has a small scale.

By the way, in the embodiment of the nonlinear mixing circuit described with reference to FIG. 4, when obtaining a signal having a gain expressed in the form of 2 ⁿ ,
Although it has been described that the bit shift of the signal is performed in the lower direction, the present invention is not limited to this. The bit shift may be performed in the upper direction of the signal. FIG. 7 shows the embodiment. Seventh
In the figure, 43 is a coefficient circuit, 44, 45, 46 are gate circuits, 47, 4
8 and 50 are addition circuits, 49 is a selection circuit, and others are the same as those in FIG.

In the subtraction circuit 34, the still image processing signal is subtracted from the moving image processing signal, and the output is supplied to the coefficient circuit 43. The coefficient circuit 43 includes a selection circuit, a gate circuit, and an addition circuit. The output signal of the subtraction circuit 34 is supplied to one input of the selection circuit 49 after being shifted upward by three bits. On the other hand, a signal obtained by shifting the output signal of the subtraction circuit 34 to a higher position by 2 bits, that is, a signal quadrupled is output to the first gate circuit 44
Supplied to Similarly, a signal obtained by shifting the output signal of the subtraction circuit 34 to one bit higher and the output signal of the subtraction circuit 34 are supplied to the second and third gate circuits 45 and 46, respectively. Here, the third gate circuit is turned on / off by the least significant bit of the control motion signal. Similarly, the second and first gate circuits are turned on and off by the second and third least significant bits of the control motion signal.

The adder circuit 47 is connected to the output signal of the third gate circuit 46 and the second
And the output signal of the gate circuit 45 is input and added. The addition circuit 48 is connected to the output signal of the addition circuit 47 and the first gate.
And the output signal of the gate circuit 44 is added and output. Adder circuit 48
Is supplied to the other input of the selection circuit 49.
The selection circuit 49 selects the output signal of the subtraction circuit 34 when the most significant bit of the control motion signal is 1, and selects the output signal of the addition circuit 48 when the most significant bit of the control motion signal is 0. Operate. After that, the output signal of the selection circuit 49 and the still image processing signal are added in the addition circuit 50 to obtain a mixed output of the still image processing signal and the moving image processing signal.

In this embodiment, rounding by bit shifting in the lower direction is performed at the end of the circuit. Therefore, the bit width in the addition circuit and the gate circuit increases,
Although the circuit scale is slightly larger than that of the embodiment of FIG. 4, the calculation error due to rounding can be reduced, and a highly accurate mixing circuit can be realized.

〔The invention's effect〕

According to the present invention, the motion signal detected once
The mixing ratio can be kept at 1 for a few fields, and then the motion signal can be rapidly attenuated. Therefore, it is possible to realize a motion-adaptive signal processing circuit with high image quality in which a motion detection error is sufficiently corrected without excessively expanding the motion signal in the space-time direction.

Further, according to the present invention, a non-linear mixed circuit can be realized with a simple circuit configuration.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing an example of a characteristic of a motion detection circuit, FIG. 3 is a diagram showing an example of a characteristic of a spatiotemporal processing circuit, and FIG. FIG. 5 is a block diagram illustrating an example of a nonlinear mixing circuit, FIG. 5 is a diagram illustrating an example of a nonlinear mixing characteristic, FIG. 6 is a diagram illustrating an example of the relationship between time and mixing ratio in the present invention, and FIG. FIG. 8 is a block diagram showing a conventional example of a nonlinear mixing circuit, FIG. 8 is a block diagram showing a conventional example, FIG. 9 is a diagram showing characteristics of a spatio-temporal processing circuit in the conventional example, and FIG. FIG. 11 is a diagram showing characteristics of a circuit, and FIG. 11 is a diagram showing a relationship between time and a mixing ratio in a conventional example. 2 ... ADC, 3 ... Frame memory 4 ... Line comb type filter 5 ... Frame comb type filter 6 ... Motion detection circuit, 8 ... LPF 11 ... Motion conversion circuit, 12 ... Time and space Processing circuit 13,18,20 Maximum value circuit 14 Horizontal processing circuit 16,25 Field memory 17,19,22 Line memory 21,26 Nonlinear mixing circuit 27 Double speed conversion circuit 28 …… DAC

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toru Suzaki 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Home Appliance Research Laboratory, Hitachi, Ltd. (72) Inventor Takaaki Matino 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Stock (56) References JP-A-63-141491 (JP, A) JP-A-62-111586 (JP, A) JP-A-62-86984 (JP, A) JP-A-61-261982 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) H04N 7/24 H04N 7/01 H04N 9/77

Claims (4)

(57) [Claims] 1. A motion detection circuit for detecting motion of an image of a television signal, and a process for inputting a motion signal detected by the motion detection circuit and attenuating the motion detection signal over a plurality of fields. A spatio-temporal processing circuit for creating a control motion signal according to the following: a still image processing signal obtained by using a signal obtained by delaying the television signal in units of fields, and two adjacent scanning lines in the same field of the television signal A moving image processing signal obtained by using the input signal, the two processed signals are mixed and output, and when the control motion signal is equal to or more than a predetermined value, only the moving image processing signal is output. And a non-linear mixing circuit in which a mixing ratio of the two processing signals is non-linearly controlled by the motion control signal. No. processing circuit. 2. The non-linear mixing circuit according to claim 1, wherein a magnitude of a bit shift obtained by sequentially bit-shifting a signal obtained by subtracting the moving image processing signal and the still image processing signal in an upper or lower direction is different. A nonlinear coefficient comprising: a plurality of adder circuits for adding a plurality of signals to each other; and an adder control circuit for controlling addition or stop of addition by each of the plurality of adder circuits by a signal of each bit of the control motion signal. The motion adaptive signal processing circuit according to claim 1, further comprising a circuit. 3. The motion adaptive signal processing circuit according to claim 1, wherein the non-linear mixing circuit determines that when the most significant bit of the control motion signal is 1, the control motion signal has a predetermined value or more. And a motion adaptive signal processing circuit for outputting only the moving image processing signal. 4. A television receiver configured to convert an interlaced scanning television signal into a progressive scanning signal, wherein: a motion detection circuit for detecting a motion of an image of the television signal; A spatio-temporal processing circuit for inputting a detected motion signal detected and performing a process of attenuating the motion detection signal over a plurality of fields to create a control motion signal, and a signal obtained by delaying the television signal in field units. And a moving image processing signal obtained by using two adjacent scanning line signals in the same field of the television signal. The two processed signals are mixed. A mixing circuit for generating an interpolated scanning line signal by mixing with a ratio M (0 ≦ M ≦ 1); and an interpolating scanning line signal from the mixing circuit. A double-speed conversion circuit that creates the sequential scanning signal using a scanning line signal, and the mixing circuit mixes the still image processing signal with X and the moving image processing signal with Y according to the following equation. And processing is performed by the control motion signal so that M (Y−X) + X and the mixture ratio M become 1 when the control motion signal is equal to or more than a predetermined value. Television receiver.