JP2000156847A - Double speed scanning conversion circuit for picture signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a conversion circuit of a high-quality high-resolution interlaced scanning to progressive double scanning. SOLUTION: The circuit to interpolate the picture signal omitted in interlaced scanning and to convent into double speed progressive scanned signals is provided with a moving vector generation part 1 for generating the moving vector of each image, a movement detection part 2 for detecting the existence of movement in an image, a VT adaptive filter 5 for generating a signal of an interpolating scanning line by adaptively changing pass-band characteristics in a vertical/time frequency area in accordance with the moving speed of the image, and a still interpolated signal generation part 4 for generating an interpolated scanning line signal suited to a still image. In the still area of an image, an interpolated scanning line signal is generated by a signal generated from the generation part 4, and in the moving picture area of the image, an interpolated scanning line signal is generated by a signal generated by the coefficient value of the filter 5 which is determined by the moving vector generated by the generation part 1 and the moving information outputted from the detection part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-speed scanning conversion circuit for converting an interlaced scanning image signal into a sequentially-scanning image signal by a scanning line interpolation process. The present invention relates to an image signal double-speed scanning conversion circuit suitable for performing high-quality scanning conversion.

[0002]

2. Description of the Related Art Hitherto, most image signals have been picked up or displayed in the form of interlaced scanning. However, with the development of multimedia, devices for displaying images in the form of sequential scanning are increasing. For this reason, a double-speed scanning conversion circuit for converting an interlaced scanning image signal into a progressive scanning image signal is required.

As a typical example of the double-speed scan conversion circuit, a motion adaptive interpolation process is known.
This changes the mixing ratio between the interpolation signal suitable for a still image generated by inter-field signal processing and the interpolation signal suitable for a moving image generated by signal processing in a field according to the motion of the image. This is to generate a signal of a scanning line missed in the interlaced scanning.

However, in this motion adaptive type interpolation processing,
Due to insufficient resolution characteristics of a moving image, image quality degradation such as deterioration of vertical resolution in a moving image portion and flicker interference in which the image flickers in a certain kind of motion occur. Further, since the resolution characteristics of the still image and the moving image are unbalanced, when the moving image is still or starts moving from the still, the resolution changes suddenly, and the natural feeling is impaired.

That is, the conventional scan conversion from the motion-adaptive interlaced scanning to the sequential scanning has problems in resolution characteristics, flicker disturbance, natural feeling, and the like, and it has been difficult to realize high image quality.

For this reason, there is a demand for a double-speed scanning conversion circuit that performs scan conversion from interlaced scanning to sequential scanning that can maintain high image quality.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a high image quality, a high resolution, a balanced resolution characteristic from a still image to a moving image, and possesses a natural feeling. It is an object of the present invention to provide a double-speed scanning conversion circuit.

[0008]

To achieve the above object, the present invention employs the following technical means.

The signal of the interpolated scanning line necessary for double-speed scanning conversion from interlaced scanning to sequential scanning is expressed in a static area of an image.
A signal generated by a static interpolation signal generator with excellent vertical resolution characteristics generated by inter-field interpolation processing, and a VT adaptive filter that adaptively changes its impulse response in the moving image area according to the speed of vertical movement in the vertical / time domain , And each is generated.

The outline of the VT adaptive filter will be described with reference to FIG. FIG. 1A shows an example of characteristics of a VT filter (fixed impulse response) used in the prior art in a vertical / time frequency domain. Then, a signal of the interpolated scanning line is generated with a fixed characteristic in which the inside of the square in the figure is a pass band. In the vertical / time frequency region of the vertical frequency ν and the time frequency f, the signal spectrum of a still image exists on the ν axis where the time frequency f is 0. On the other hand, when the image moves in the vertical direction and flicker interference is conspicuous in the conventional sequential scanning, the signal spectrum component exists on a plane inclined by an angle θ with respect to the ν axis, as shown in the figure. In addition,
Is proportional to the speed of movement. Therefore, in a VT filter having a fixed pass band characteristic, a signal spectrum component that can be extracted by such a vertical movement is restricted. For this reason, the spectral components of the original signal are damaged, and the image quality is degraded.

FIG. 1B shows an example of characteristics of the VT adaptive filter according to the present invention in the vertical / time frequency domain. In a normal motion in which the image quality deterioration in the progressive scanning is not conspicuous, as shown in (1), the characteristics are set to the same as those of the conventional VT filter. On the other hand, in the case of movement at a slow speed in the vertical direction where disturbance is conspicuous in the sequential scanning (2), the speed is small, but in the movement slightly faster than the slow speed, the original signal as shown in (3). Is adaptively changed so that the spectral components of the passband can be almost completely extracted. For this reason, the interpolation scanning line can be generated while the original signal component is kept. Then, double-speed scanning conversion with less deterioration in image quality is realized as compared with the related art.

In the present invention, the detection of the vertical motion of an image required for controlling the operation of the VT adaptive filter is performed by signal processing for searching and generating a motion vector in a plurality of frame periods. That is, only a block including a motion in the still / moving block determination sets a representative vector with a motion vector of an adjacent reference block, and the processing amount of the re-search, the singular vector correction, and the mini-block division search starting from the motion vector is reduced. A small and highly accurate search and generation of a motion vector are realized. Further, with respect to the image signal subjected to the motion compensation prediction coding, search and generation utilizing the motion vector information are performed, thereby realizing with a smaller amount of calculation.

[0013] By the technical means described above, high image quality,
A double-speed scanning conversion circuit having high resolution and balanced resolution characteristics from a still image to a moving image can be realized.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described.
This will be described with reference to FIGS.

FIG. 1 is a block diagram of a scan conversion circuit according to one embodiment of the present invention. The motion vector generation unit 1, the motion detection unit 2, the characteristic setting unit 3, the stationary interpolation signal generation unit 4, and the VT adaptive filter 5 , A selection unit 6, a delay unit 7, and a speed doubling unit 8.

The motion vector generation unit 1, as described later,
A motion vector PV in pixel units is generated from the interlaced image signal S1 (luminance signal and color difference signal). Further, the motion detection unit 2 calculates the motion information MD from the frame difference signal component.
(A binary signal of 0 for stillness and 1 for motion) is detected.

The characteristic setting section 3 sets the characteristic MOD of the VT adaptive filter based on the motion vector PV and the motion information MD. In the VT adaptive filter 5, the characteristic M
The signal S3 of the interpolation scanning line is generated with the coefficient value determined by OD. This operation will also be described later.

The stationary interpolation signal generator 4 generates an interpolated scanning line signal S2 suitable for a still image by signal processing between fields (for example, the signal of the previous field).

The selecting section 6 selects the signal S2 in the static area where the motion information MD is 0 and the signal S3 in the moving picture area where the MD is 1, and generates the interpolated scanning line signal SIP.

The speed doubling unit 8 includes an image signal SM of interlaced scanning whose time delay is adjusted by the delay unit 7 and an interpolation scanning line signal S.
The IP and the IP are respectively subjected to a 圧 縮 compression process on the time axis and a time-series rearrangement process to obtain a sequentially-scanned image signal S4.

Hereinafter, the structure and operation of the main blocks will be described in detail.

FIG. 2 shows an example of the configuration of the motion vector generator. N-frame delay unit 9, static / dynamic block discriminating unit 10,
Representative vector setting unit 11, re-search unit 12, singular vector correction unit 13, mini-block division search unit 14, memory unit 1
Consists of five.

The image quality deterioration that is conspicuous in the prior art occurs in the vertical movement at a speed of one line / one frame to several frames. In order to accurately extract a motion at such a speed, a motion vector is detected and generated using the original signal S1 and the signal SD delayed by N frame periods (for example, N = 4) by the N frame delay unit 9. .

The static / moving block discriminating section 10 outputs signals S1 and S1.
A difference signal component from D is extracted, and when this signal level is less than the set value ± th, it is determined that the camera is stationary, and when the signal level is greater than or equal to the threshold, it is determined that the camera is moving. Then, it identifies a still block and a moving image block in block units (block size is, for example, 8 horizontal pixels × 8 vertical lines), and outputs a static identification signal BMF (0 for a static block, 1 for a moving image block).

When the static / dynamic identification signal BMF is 0, the representative vector setting unit 11 sets the representative vector TMV and the prediction error signal ER
Outputs 0 to T. On the other hand, when the signal BMF is 1, the representative vector is set by the reference vector RMV. FIG. 3 (a)
Shows an example of this reference vector. In the reference block indicated by the dotted line in the area before the current block, the motion vector in the current frame is used as the reference frame, and in the reference blocks in the area after the current block, the motion vector in the previous frame is used as the reference motion vector.
Then, the prediction error ER due to these reference vectors RMV
T is calculated by the equation (1).

(Equation 1) ERT = Σ | S1 (x, y) -SD (x + RMVx, y + RMVy) | (1) where S1 (x, y) is the position (x, y) of the current block. The value of the signal S1, SD (x + RMVx, y + RMVy), is the value of the signal SD at a point shifted by the x-direction component RMVx and the y-direction component RMVy of the reference vector RMV, ||
Is the absolute value, and Σ is the sum of the pixels in the block. Then, the reference vector with the smallest prediction error is set as the representative vector TMV.

The re-search unit 12 in FIG. 2 performs a re-search process starting from the representative vector according to the components of the representative vector and the prediction error. That is, when the prediction error is smaller than the set value, the representative vector is set as the motion vector MV1 of the current block. On the other hand, when the value is equal to or larger than the set value, the re-search shown in FIG. Starting from the representative vector TMV, the search range is a dotted line area when the prediction error is small, a thick dotted line area inside, and a solid line area when the prediction error is large. The motion vector MV1 is detected by the re-search by the block matching process in the search area consisting of.

Returning to FIG. 2, the singular vector correction unit 13
A singular vector having a low correlation with a motion vector of an adjacent block is corrected. This is schematically shown in FIG. A motion vector in which the motion vector MV1 of the current block is different from any of the motion vectors MVa to MVd of the vertically and horizontally adjacent blocks is detected as a singular vector. The singular vectors are the motion vectors MVa to MV of the adjacent blocks.
A correction process is performed to replace the d with the one with the smallest prediction error, and the result is output to the motion vector MV2.

Referring back to FIG. 2, the memory unit 15 stores the motion vector and outputs a reference vector RMV necessary for setting a representative vector.

The mini-block division search section 14 generates a motion vector PV for each pixel. The outline of this operation is shown in FIG.
(D). The block is subdivided horizontally and vertically and divided into mini blocks (for example, 2 pixels × 2 lines). Then, a search process for prediction error adaptation is performed for each mini-block, and a motion vector PV of a pixel in the mini-block is generated. That is, if the prediction error is less than the set value, a PV is generated using the motion vector MV2. On the other hand, when the value is equal to or larger than the set value, a PV is generated using the motion vector MV2 of the current block and the motion vector MVa to MVh of an adjacent block surrounding the current block with the smallest prediction error. And FIG.
As shown in (e), in each of the first and second fields of the interlaced scanning, a motion vector PV for each of N frame periods is generated.

Next, one configuration of the motion detecting section will be described with reference to FIG. The signal S1 and a signal obtained by delaying the signal S1 by the one-frame delay unit 16 for one frame period are subjected to a subtraction process by the subtraction unit 17 to generate a frame difference signal FD. Binary quantization unit 1
8 performs binary quantization of 0 when the signal FD is less than the set value ± th1 and 1 when the signal FD is equal to or more than the set value ± th1, thereby generating a binary signal QFD. Then, in order to avoid motion detection omission, the spatiotemporal smoothing unit 1
In 9, horizontal / vertical spatial directions or horizontal / vertical /
Performs a smoothing process in the spatio-temporal direction of time, and outputs motion information MD
Generate

Finally, the configuration and operation of the VT adaptive filter will be described with reference to FIG. This is suitable for a configuration using signals of two fields in the time direction.

FIG. 5A is an example of an impulse response in the vertical / time domain. In the current field clearly indicated as n field in the drawing, 1,0,7,16,7,0,1 (1 /
In the fixed coefficient value of (16) and the previous field which is specified as the n-1 field, A-2, A-1, and A-2 determined by the characteristic MOD.
This is a response of variable coefficient values of A-0, A1, and A2 (1/16).

FIG. 2B is a schematic diagram of the generation of an interpolated scanning line by the VT adaptive filter. The interpolation scanning line indicated by the black circle symbol of the current field of the n-th field has coefficient values 1, 7, and fixed to the signal of the scanning line indicated by the white circle symbol of the current field.
Multiplied by 7,1 (1/16), and variable coefficient values A-2, A-1, A0, A1, A2 determined by the characteristic MOD to the signal of the scanning line indicated by the white circle symbol in the field preceding the n-1 field.
(1/16), and these coefficient-weighted signals are added and generated.

FIG. 3C shows n-1 determined by the characteristic MOD.
It is an example of a variable coefficient value of a field. In a slow downward movement, MOD = 1 means that the vertical movement speed Vy corresponds to one line / field in the interlaced scanning system, and A-2, A-1, A0 are -4, 8, -4 ( 1/1
6), A1 and A2 are set to 0. MOD = 2 corresponds to 3/4 line / field, and A-2, A-1,
A0 and A1 are set to -3, 5, 1, -1 (1/16), and A2 is set to 0. Hereinafter, similarly, MOD = 4 corresponds to 1/4 line / field, and A-2, A-1, A0, A1
Are set to -1, -1, 5, -3 (1/16), and A2 is set to 0. MOD = 0 corresponds to the case where Vy is 0 or the image quality deterioration in the sequential scanning is not conspicuous.
A0, A1 are -4, 8, -4 (1/16), A-2, A
2 is set to 0.

On the other hand, in a slow upward movement, M
OD = 11 corresponds to one line / field movement, and A
0, A1, A2 are -4, 8, -4 (1/16), A-
2, A-1 is set to 0. Hereinafter, similarly, MOD = 1
When it corresponds to the movement of 1/4 line / field of 4,
A-1, A0, A1, and A2 are -3, 5, -1, -1 (1
/ 16), A-2 is set to 0.

This characteristic is also set by a coefficient based on D.
As shown in FIG. 11, a VT adaptive filter that changes characteristics so that the spectrum of the original signal has a pass band according to the speed of movement is realized.

As described above, according to the first embodiment of the present invention, a double-speed scanning conversion circuit having high image quality, high resolution, and balanced resolution characteristics from a still image to a moving image can be realized.

Next, a second embodiment of the present invention will be described with reference to the block diagram of FIG. This embodiment is suitable for suppressing image quality deterioration rarely occurring depending on a picture in a fast-moving area.

The structure is shown in FIG.
A moving image interpolation signal generation unit 20 and an interpolation characteristic setting unit 22 are newly added to the first embodiment, and a selection unit 21 uses a selection signal MDD of the interpolation characteristic setting unit 22 to generate a static interpolation signal generation unit 4.
, The signal S3 of the VT adaptive filter 5, or the signal S5 of the moving image interpolation signal generator 20 to generate an interpolation scanning line signal SIP.

The moving image interpolation signal generation section 20 generates an interpolation scanning line signal S5 suitable for a moving image having a fast movement by signal processing in a field (for example, averaging processing of upper and lower scanning lines).

The interpolation characteristic setting section 22 generates a selection signal MDD with the characteristic shown in FIG. That is, the motion information M
In the static area where D is 0, the signal S of the static interpolation signal generator 4
The selection signal MDD is set so as to select 2. on the other hand,
In the moving image area where the motion information MD is 1, when the scalar amount | PV | of the motion vector PV is less than the set value th (for example, a screen width / 1 second, a screen height / 1 second or less that the line of sight can follow), In the same manner as in the first embodiment, the selection signal MDD is set so as to select the signal S3 of the VT adaptive filter 5. However, when | PV | moves faster than the set value th, the selection signal MDD is set so as to select the signal S5 of the moving image interpolation signal generation unit 20.

The configuration and operation of the other blocks are the same as those of the first block.
This is the same as the embodiment, and the description is omitted.

As described above, according to the second embodiment of the present invention, a double-speed scanning conversion circuit having high image quality, high resolution, and balanced resolution characteristics from a still image to a moving image can be realized.

Next, a third embodiment of the present invention will be described with reference to FIGS. The present embodiment is suitable for improving the accuracy and simplification of motion vector generation by utilizing motion vector information of motion compensation prediction coding (for example, MPEG video coding).

FIG. 7 is a block diagram showing this configuration. This is realized by a configuration in which a decoder unit 23 is added to the first embodiment shown in FIG. 1 and a motion vector conversion generation unit 24 is provided instead of the motion vector generation unit.

The decoder unit 23 performs a predetermined decoding process on the coded bit stream signal DBS that has been subjected to motion compensation prediction coding (for example, MPEG video coding of an international standard), and performs an interlaced scanning image signal S1. And outputs the motion vector information MVI.

The motion vector conversion / generation unit 24 corrects the motion vector information MVI into a motion vector per N frames by a simple operation, and generates a motion vector PV in pixel units from this.

FIG. 8 shows an example of this configuration. This is configured by adding a motion vector conversion unit 25 to the configuration of the motion vector generation unit of FIG. 2 described above.

The motion vector conversion unit 25 generates a motion vector RRMV for N frame periods by a simple operation from motion vector information MVI for generating a motion compensated prediction frame by motion compensation prediction coding, for example, MPEG video coding. I do.

This operation will be schematically described with reference to FIG. MPEG
In video encoding, two types of motion compensation prediction encoding are performed on an image signal sequence. One is to perform one-way motion compensation prediction coding on a P picture (a frame indicated by a symbol P in the figure) shown in FIG. That is, for a P picture for each M frame period, the motion vector in this period is set to a P vector (PV1, PV2, Pv3, PV
4), and a DCT encoding is performed on a difference component between a prediction frame formed by performing motion compensation prediction using the P vector and the current frame. Therefore, the P vector is a motion vector in the M frame period. Therefore, a calculation process for multiplying the P vector by N / M is performed to generate a conversion vector RRMV corresponding to a motion vector in an N frame period.

The other is a B picture shown in FIG.
(Frames indicated by symbols B in the figure) are subjected to bidirectional motion compensation prediction coding. That is, two motion vectors from the frame immediately before and after the B picture are obtained as B vectors, and the difference component between the current frame and the predicted frame created by performing motion compensation prediction using the B vector is DCT-coded. Therefore, one of the B vectors is a motion vector in one frame period. Therefore, this B vector is expressed as N
A multiplication operation is performed to generate a conversion vector RRMV corresponding to the motion vector in the N frame period.

Returning to FIG. 8, the representative vector setting unit 11
This transformation vector RRMV is also used as a reference vector,
The representative vector TMV is set. That is, in a static block in which the static motion identification signal BMF of the static motion block determining unit 10 is 0, the representative vector YMV and the prediction error ERT are set to 0. On the other hand, in a moving image block with a BMF of 1, the motion vector RMV of the adjacent reference block (shown earlier in FIG. 3A) and the transform vector RRMV having the smallest prediction error are represented as the representative vector TMV. Is set, and the prediction error at that time is output to the ERT.

The subsequent re-search unit 12, singular vector correction unit 13, and mini-block division search unit 14 perform the same operations as the motion vector generation unit shown in FIG. 2 to generate a motion vector PV in pixel units. .

Referring back to FIG. 7, the motion vector conversion generation unit 24
In the subsequent blocks, the same operation as that of the first embodiment is performed using the motion vector PV generated in units of pixels, and a signal S4 of progressive scanning is obtained.

Next, FIG. 10 shows a block configuration of a fourth embodiment of the present invention. This embodiment is also suitable for improving the accuracy and simplicity of motion vector generation by utilizing motion vector information of motion compensation prediction encoding (for example, MPEG video encoding).

This configuration is realized by a configuration in which a decoder 23 is added to the second embodiment shown in FIG. 6 and a motion vector conversion generator 24 is provided instead of the motion vector generator. The decoder 23 and the motion vector conversion generator 24 perform the same configuration and operation as in the third embodiment. Then, with the generated motion vector PV in pixel units,
In the subsequent blocks, the same operation as in the second actual example is performed to obtain the signal S4 of the sequential scanning.

As described above, according to the third and fourth embodiments, an image signal having a balanced resolution characteristic from a still image to a moving image, having less flicker disturbance, and having a natural view. Can be realized at low cost. In addition, a remarkable effect can be obtained for improving the image quality and resolution of the image.

The description of the embodiment of the present invention is completed above, but the configuration of the VT adaptive filter will be slightly supplemented. In the embodiment, the configuration using the signal of the two fields of the current field and the previous field has been described.
The present invention can also be realized by a configuration using signals of three fields of the current field and the fields before and after the current field.

[0060]

According to the present invention, it is possible to realize a double-speed scanning conversion circuit of an image signal which has a balanced resolution characteristic from a still image to a moving image, has less flicker disturbance, and has a natural view. In addition, a remarkable effect can be obtained for improving the image quality and resolution of the image.

[Brief description of the drawings]

FIG. 1 is a block diagram of a double-speed scanning conversion circuit according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration example of a motion vector generation unit according to the first embodiment.

FIG. 3 is an explanatory diagram of an outline of the operation of a motion vector generation unit in FIG. 2;

FIG. 4 is an explanatory diagram illustrating a configuration example of a motion detection unit according to the first embodiment.

FIG. 5 is a block diagram showing a configuration example of a VT adaptive filter according to a second embodiment of the present invention.

FIG. 6 is a block diagram of a double-speed scanning conversion circuit according to a second embodiment of the present invention and an explanatory diagram of interpolation characteristics.

FIG. 7 is a block diagram of a double-speed scanning conversion circuit according to a third embodiment of the present invention.

FIG. 8 is a block diagram illustrating a configuration example of a motion vector conversion generation unit according to a third embodiment.

FIG. 9 is an explanatory diagram of an outline of the operation of the motion vector conversion unit in FIG. 8;

FIG. 10 is a block diagram of a double-speed scanning conversion circuit according to a fourth embodiment of the present invention.

FIG. 11 is a characteristic diagram of a VT adaptive filter for explaining the principle of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Motion vector generation part, 2 ... Motion detection part, 3 ... Characteristic setting part, 4 ... Static interpolation signal generation part, 5 ... VT adaptive filter, 6,21 ... Selection part, 7 ... Delay part, 8 ... , 9
... N-frame delay section, 10...
... Representative vector setting unit, 12 ... Re-search unit, 13 ... Singular vector correction unit, 14 ... Mini-block division search unit, 15 ...
Memory unit, 16: one frame delay unit, 17: subtraction unit, 1
8: Binary quantization unit, 19: Spatio-temporal smoothing unit, 20: Moving image interpolation signal generation unit, 22: Interpolation characteristic setting unit, 23: Decoder unit, 24: Motion vector conversion generation unit, 25: Motion vector conversion unit

Continued on the front page (72) Inventor Takaaki Matino 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Visual Information Media Division of Hitachi, Ltd. (72) Haruki Takada 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture (72) Inventor Takashi Kanehachi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside (72) Inventor Masato Sugiyama Yokohama, Kanagawa Prefecture 292 Yoshida-cho, Totsuka-ku, Ichitochi, Ltd. Multimedia System Development Headquarters, Hitachi, Ltd. (72) Inventor Mitsuo Nakajima 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Pref. Person Yasutaka Tsuru 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture F-term in the Multimedia System Development Division of Hitachi, Ltd. (Reference) 5C063 AA01 BA04 BA10 BA12 CA07 CA34 CA38 5C082 BA41 BC06 BC07 BC19 CA21 CA22 CA84 MM10

Claims (11)

[Claims] A double-speed scanning conversion circuit for converting an image signal generated by an interlaced scanning into a signal of a sequential scanning by generating a signal of a scanning line by an interpolation process; A motion detector that detects the presence or absence of image motion, a VT adaptive filter that adaptively changes passband characteristics in the vertical / time frequency domain according to the speed of image motion and generates an interpolation scanning line signal, A static interpolation signal generating unit that generates a signal of an interpolation scanning line suitable for a still image, and generates a signal of an interpolation scanning line with a signal of the static interpolation signal generating unit in a still region of an image, and generates a signal of an interpolation scanning line in a moving image region of the image. An image signal, wherein a signal of an interpolation scanning line is generated by a signal generated by a coefficient value of the VT adaptive filter determined by a motion vector of the motion vector generation unit and motion information of the motion detection unit. Speed scan conversion circuit. 2. A double-speed scan conversion circuit for converting an image signal generated by an interlaced scan into a signal of a sequential scan by generating an interpolated scan line signal by an interpolation process; A motion detector that detects the presence or absence of image motion, a VT adaptive filter that adaptively changes passband characteristics in the vertical / time frequency domain according to the speed of image motion and generates an interpolation scanning line signal, A static interpolation signal generation unit that generates a signal of an interpolation scanning line suitable for a still image; and a moving image interpolation signal generation unit that generates a signal of an interpolation scanning line suitable for a moving image. The signal of the interpolation scanning line is generated by the signal of the generation unit, and in the moving image region of the image, when the motion speed is less than the set value, the motion vector is determined by the motion vector of the motion vector generation unit and the motion information of the motion detection unit. A signal of the interpolation scanning line is generated by a signal generated by the coefficient value of the T adaptive filter, and when the motion speed is equal to or higher than a set value, a signal of the interpolation scanning line is generated by a signal of the moving image interpolation signal generation unit. Characteristic double speed scanning conversion circuit for image signals. 3. A double-speed scan conversion circuit of an image signal for generating a signal of a scanning line lost in the interlaced scanning by an interpolation process and converting the signal into a progressive scanning signal. A decoder for decoding a signal and motion vector information, a motion vector conversion generator for generating a motion vector by the above-described motion vector information conversion processing, a motion detector for detecting presence / absence of image motion, and a speed of image motion VT adaptive filter that adaptively changes the pass band characteristics in the vertical / time frequency domain according to the VT adaptive filter, and generates a signal of the interpolation scanning line suitable for a still image. In the still region of the image, the signal of the interpolation scanning line is generated by the signal of the still interpolation signal generation unit, and in the moving image region of the image, the motion vector of the motion vector conversion generation unit is generated. Speed scan conversion circuit of the image signal and generates a signal of the interpolation scan lines generated by the coefficient value of the VT adaptive filter defined by the detection of the motion information can. 4. An image signal double-speed scan conversion circuit for generating a signal of a scanning line skipped by interlaced scanning by an interpolation process and converting the signal into a progressive scanning signal, wherein the motion-compensated prediction coded signal is decoded by a predetermined decoding process. A decoder for decoding a signal and motion vector information, a motion vector conversion generator for generating a motion vector by the above-described motion vector information conversion processing, a motion detector for detecting presence / absence of image motion, and a speed of image motion VT adaptive filter that adaptively changes the pass band characteristics in the vertical / time frequency domain according to the VT adaptive filter, and generates a signal of the interpolation scanning line suitable for a still image. And a moving image interpolation signal generation unit that generates a signal of an interpolation scanning line suitable for a moving image. In a still region of an image, a signal of the interpolation scanning line is generated by a signal of the still interpolation signal generation unit. In the moving image area, when the motion speed is less than the set value, the signal generated by the coefficient value of the VT adaptive filter determined by the motion vector of the motion vector conversion generation unit and the motion information of the motion detection unit is used to generate the interpolation scan line. A double-speed scanning conversion circuit for an image signal, wherein a signal of the moving image interpolation signal generating unit is used to generate a signal of an interpolation scanning line when a signal is generated and the motion speed is equal to or higher than a set value. 5. In the VT adaptive filter, the impulse response in the vertical / time domain has a variable coefficient that changes according to the fixed coefficient value in the current field and the speed of the vertical movement in the previous field or the previous and subsequent fields. 5. The method according to claim 1, wherein the image signal is configured in a form of taking a numerical value, and its vertical / time frequency characteristic is such that a signal spectrum component of an image determined by a speed of a vertical movement is substantially a pass band. Double-speed scanning conversion circuit for image signals. 6. A motion vector generating section for generating a motion vector of an image, a static / dynamic block determining section for identifying a still block and a moving image block, and a representative vector setting for setting a representative vector from a motion vector of an adjacent reference block. Section, a re-search section for re-searching in a search area determined by the prediction error of the representative vector and its directional component, a singular vector correction section for correcting a motion vector having a low correlation with a motion vector of an adjacent block, and A mini-block division search unit that adaptively performs a mini-block division search according to the magnitude of a prediction error of the mini-block subdivided in the vertical direction to generate a pixel-based motion vector; 3. The image signal double-speed scanning conversion circuit according to 1 or 2. 7. A motion vector conversion generating section for converting motion vector information of P and B pictures of motion compensated predictive coding into a motion vector in a predetermined frame period, a still block and a moving image block. A representative vector setting unit that sets a representative vector from a motion vector of an adjacent reference block, a re-search unit that performs a search again in a search area determined by a prediction error of the representative vector and its directional component. A singular vector correction unit that corrects a motion vector having a low correlation with a motion vector of an adjacent block, and performs a miniblock division search adaptively according to the magnitude of the prediction error of a miniblock obtained by dividing a block into horizontal and vertical directions. 5. A mini-block division search unit for generating a motion vector in pixel units by using Speed scan conversion circuit of the mounting of the image signal. 8. The representative vector setting section according to claim 6, wherein the stationary block sets the representative vector to 0, and the moving image block is a motion vector detected in the current frame in a reference block earlier than the current block. In the reference block, a motion vector double-speed scan conversion circuit characterized in that a motion vector detected with a minimum prediction error among motion vectors detected before the current frame is set as a representative vector. 9. The re-search section according to claim 6, wherein
If the prediction error of the representative vector is equal to or less than the set value, the representative vector is set as a motion vector.If the prediction error is equal to or more than the set value, the search range is increased from the representative vector as the prediction error increases. A double speed scan conversion circuit for an image signal, characterized in that a motion vector is set by re-searching by block matching processing in a horizontally long, square, or vertically long area in accordance with the shape of the motion vector. 10. The singular vector correction unit according to claim 6, wherein a singular vector different from the motion vector of any of the adjacent upper, lower, left, and right blocks is detected as a singular vector, and prediction is performed among the upper, lower, left, and right motion vectors. A double speed scanning conversion circuit for an image signal, wherein the circuit is replaced with a signal having a minimum error. 11. The mini-block division search unit according to claim 6, wherein a motion vector of the block is set to a pixel in the block when the prediction error is smaller than the set value, and a block whose prediction error is smaller than the set value is set. For the mini-block subdivided in the horizontal and vertical directions, the motion vector of the block and the motion vector of the block adjacent thereto which has the smallest prediction error is set as the motion vector of the pixel in the mini-block. The double speed scanning conversion circuit of the image signal to be performed.