JPH10336596A - Progressive scanning converting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a progressive operation image signal that has less quality deterioration for a dynamic picture and a still picture by calculating a median of a motion vector by the motion vector of a block which an image signal writes, taking the difference between the median and the motion vector of each block and obtaining an interfield interpolation signal for each block according to the difference vector. SOLUTION: A difference vector detection circuit 6 takes a difference of a median between a motion vector for each block outputted from a motion vector detection circuit 3 and the motion vector outputted from a median filter 5, halves a length and outputs it anew as the motion vector for each block. A mobile circuit 7 transfers an image signal for each block according to the motion vector for each block which the difference vector detection circuit 6 outputs and outputs an interfield interpolation signal. A vector length detection circuit 8 calculates a length of the motion vector for each block outputted from the difference vector detection circuit 6 and outputs it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image signal scan conversion, and more particularly to an apparatus for converting a 2: 1 interlaced scan signal into a sequential scan signal.

[0002]

2. Description of the Related Art A conventional scan conversion apparatus detects a motion vector of an image when performing interpolation of a scan line required for conversion.
The output of the inter-field interpolation circuit is preferentially mixed with respect to the still image, and the output of the intra-field interpolation circuit is preferentially mixed with the moving image to perform the sequential scan conversion. For example, there is one disclosed in JP-A-1-108886.

FIG. 14 is a schematic diagram of a conventional scanning line interpolation device. Reference numeral 111 denotes image information of 2: 1 interlaced scanning, 1
12, 113 and 114 are field memories, 115 is a motion detecting circuit, 116 is a mixing circuit, 117 and 118 are time axis conversion circuits, 119 is a switching circuit, 120 is image information of sequential scanning, 121 is a motion vector detecting circuit, 122 Is a position shift circuit.

When image information obtained by 2: 1 interlaced scanning is supplied to the input terminal 111, the field memory 11
2 outputs the image information of the next field, the field memory 113 outputs the image information of the current field, and the field memory 114 outputs the image information of the previous field. The image information of the previous field and the image information of the next field are input to the motion vector detection circuit 121, and a motion vector for one frame is detected. The detected motion vector is input to the position moving circuit 122, and the image information of the previous field is moved by の of the motion vector.

On the other hand, the image information of the preceding field and the succeeding field is also input to the motion detecting circuit 115, and the motion of each pixel is detected based on the absolute value of the luminance difference between the preceding field and the succeeding field.

The output of the position shift circuit 122 and the image information of the previous field are input to the mixing circuit 116, and a signal obtained by mixing the two is output. At that time, the mixing circuit 116 changes the mixing ratio according to the output of the motion detection circuit 115.
Further, the image information of the current field is also input to the mixing circuit 116, and if a vector cannot be detected by the motion vector detection circuit 121, a signal obtained by interpolating between scanning lines of the current field is output using only the image information of the current field. You.

The image information of the current field and the mixing circuit 116
Are input to time axis conversion circuits 117 and 118, respectively, and are compressed to 1/2 on the time axis. After that, the switching circuit 119 switches the time axis conversion circuit 11 every one horizontal period.
7, 118 were switched and output, and an image signal 120 of progressive scanning was obtained.

[0008]

However, in the above arrangement, the image information of the previous field is mixed with a signal obtained by moving the image information of the previous field by half of the detected motion vector. In order to interpolate between the scanning lines of the current field, if the detected motion vector is incorrect due to the influence of noise or the like, the image quality deteriorates because the scanning lines are interpolated by incorrect image information.
There has been a problem that, when the image is scrolled, that is, panned, moving image processing is performed and discontinuity of the image occurs.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a progressive scan conversion apparatus which can accurately detect a motion vector by performing a filtering process, and can reduce image quality deterioration.

[0010]

According to the present invention, an input signal is set to one.
A first field memory for delaying the field, a second field memory for delaying the output signal of the first field memory by one field, and an intra-field interpolation signal obtained by interpolating only the image signal of the current field from the output of the first field memory. An intra-field interpolation circuit to output,
A motion vector detection circuit for detecting a motion vector between frames from the input signal and the output of the second field memory in units of blocks, and taking the median of vertical and horizontal components from the motion vector output of each block of the motion vector detection circuit;
A median filter that outputs as a vector, a difference vector detection circuit that detects a vector difference from a motion vector output of each block of the motion vector detection circuit and a vector output of the median filter, and a difference vector image signal of a previous field. A moving circuit that outputs an inter-field interpolation signal shifted by the difference vector detected by the vector detecting circuit, a vector length detecting circuit that detects a vector length of the difference vector detected by the difference vector detecting circuit, and the moving circuit A mixing circuit that outputs a mixed interpolation signal by changing a mixing ratio of the output of the interpolating circuit and the output of the intra-field interpolating circuit according to the output of the vector length difference circuit; Scan conversion characterized by comprising a progressive scan signal output circuit for outputting It is the location.

According to the present invention, there is provided a first field memory for delaying an input signal by one field, a second field memory for delaying an output signal of the first field memory by one field, and a current field based on an output of the first field memory. An intra-field interpolation circuit for outputting an intra-field interpolation signal interpolated only by an image signal; a motion vector detection circuit for detecting a motion vector between frames in units of blocks from an input signal and an output of a second field memory; An average filter that takes the average value of the vertical and horizontal components from the motion vector output of each block of the circuit and outputs it as a vector; and a vector based on the motion vector output of each block of the motion vector detection circuit and the vector output of the average filter. A difference vector detection circuit for detecting a difference between A moving circuit that outputs an inter-field interpolation signal obtained by moving a field image signal by the difference vector detected by the difference vector detection circuit, and a vector length that detects a vector length of the difference vector detected by the difference vector detection circuit A detection circuit; a mixing circuit that changes a mixing ratio of an output of the moving circuit and an output of the intra-field interpolation circuit in accordance with an output of the vector length difference circuit to output a mixed interpolation signal; A progressive scan conversion device comprising a progressive scan signal output circuit for outputting a progressive scan signal from a field signal.

According to the present invention, there is provided a first field memory for delaying an input signal by one field, a second field memory for delaying an output signal of the first field memory by one field, and a current field based on an output of the first field memory. An intra-field interpolation circuit for outputting an intra-field interpolation signal interpolated only by an image signal; a motion vector detection circuit for detecting a motion vector between frames for each block from an input signal and an output of a second field memory; A first average filter that outputs the average value of the motion vector of the block in the first row of the output of the circuit; and a second filter that outputs the average value of the motion vector of the block in the second row of the output of the motion vector detection circuit. (2) average value filter and motion vector of the block in the third row of the output of the motion vector detection circuit A third average value filter that outputs an average value, a median value filter that detects a median value from output values of the first average value filter, the second average value filter, and the third average value filter, and the motion vector detection A difference vector detection circuit for detecting a vector difference from the output of the circuit and the output of the median filter, and an inter-field interpolation signal obtained by moving the image signal of the previous field by the difference vector detected by the difference vector detection circuit A moving circuit, a vector length detecting circuit for detecting a vector length of a difference vector detected by the difference vector detecting circuit, and a vector length difference circuit for determining a mixing ratio between an output of the moving circuit and an output of the intra-field interpolation circuit. A mixing circuit that outputs an interpolated signal that is mixed according to the output of the interpolated signal, Comprise a progressive scanning signal output circuit outputs a progressive scanning signal from a progressive scan conversion device according to claim.

According to the present invention, there is provided a first field memory for delaying an input signal by one field, a second field memory for delaying an output signal of the first field memory by one field, and a current field of a current field from an output of the first field memory. An intra-field interpolation circuit for outputting an intra-field interpolation signal interpolated only by an image signal; a motion vector detection circuit for detecting a motion vector between frames in units of blocks from an input signal and an output of a second field memory; A first average filter for taking an average value of vertical and horizontal components from the motion vector output of the block in the first column of the motion vector output of each block of the circuit and outputting as a vector; Take the average of the vertical and horizontal components from the motion vector output of the block in the second column. A second average value filter for outputting as a vector, a third average value filter for taking an average value of vertical and horizontal components from the motion vector output of the block in the third column of the output of the motion vector detection circuit, and outputting as a vector A median filter that takes median values of vertical and horizontal components from vector outputs of the first average value filter, the second average value filter, and the third average value filter, and outputs the vector as a vector; A difference vector detection circuit for detecting a difference between the output and a vector output of the median filter, and an inter-field interpolation signal obtained by moving the image signal of the previous field by the difference vector detected by the difference vector detection circuit A moving circuit and a vector length of the difference vector detected by the difference vector detecting circuit are detected. A mixing circuit that outputs a mixed interpolation signal by changing a mixing ratio of an output of the moving circuit and an output of the intra-field interpolation circuit in accordance with an output of the vector length difference circuit; A progressive scan conversion device comprising a progressive scan signal output circuit for outputting a progressive scan signal from a signal and a signal of a current field.

According to the present invention, there is provided a first field memory for delaying an input signal by one field, a second field memory for delaying an output signal of the first field memory by one field, and a current field of an output signal of the first field memory. An intra-field interpolation circuit for outputting an intra-field interpolation signal interpolated only by an image signal; a motion vector detection circuit for detecting a motion vector between frames in units of blocks from an input signal and an output of a second field memory; A median filter 1 that takes the median value of the vertical and horizontal components from the motion vector output of the block on the first row of the motion vector output of each block of the circuit and outputs it as a vector;
A median filter 2 that takes the median value of the vertical and horizontal components from the motion vector output of the block in the row and outputs the vector as a vector. Median filter 3 that takes the median of horizontal components and outputs it as a vector
A median filter that takes median values of vertical and horizontal components from vector outputs of the median filter 1, the median filter 2, and the median filter 3 and outputs the vector as a vector; and each block of the motion vector detection circuit A difference vector detection circuit that detects a difference between the motion vector output and the output of the median filter, and an inter-field interpolation signal obtained by moving the image signal of the previous field by the difference vector detected by the difference vector detection circuit. A moving circuit for outputting, a vector length detecting circuit for detecting a vector length of the difference vector detected by the difference vector detecting circuit, and a mixing ratio between an output of the moving circuit and an output of the intra-field interpolation circuit, the vector length difference A mixing circuit that outputs a mixed interpolation signal that is changed according to the output of the circuit; A progressive scanning conversion apparatus comprising: a progressive scanning signal output circuit outputs a progressive scanning signal from the signal and the signal of the current field.

According to the present invention, there is provided a first field memory for delaying an input signal by one field, a second field memory for delaying an output signal of the first field memory by one field, and a current field of a current field from an output of the first field memory. An intra-field interpolation circuit for outputting an intra-field interpolation signal interpolated only by an image signal; a motion vector detection circuit for detecting a motion vector between frames in units of blocks from an input signal and an output of a second field memory; A median filter 1 for taking the median of the vertical and horizontal components from the motion vector output of the block in the first column of the motion vector output of each block of the circuit, and outputting the vector as a vector;
A median filter 2 that takes the median value of the vertical and horizontal components from the output of the motion vector of the block in the column and outputs the vector as a vector. Median filter 3 that takes the median of horizontal components and outputs it as a vector
A median filter that takes median values of vertical and horizontal components from vector outputs of the median filter 1, the median filter 2, and the median filter 3 and outputs the vector as a vector; and each block of the motion vector detection circuit A difference vector detection circuit that detects a difference between the motion vector output and the output of the median filter, and an inter-field interpolation signal obtained by moving the image signal of the previous field by the difference vector detected by the difference vector detection circuit. A moving circuit for outputting, a vector length detecting circuit for detecting a vector length of the difference vector detected by the difference vector detecting circuit, and a mixing ratio between an output of the moving circuit and an output of the intra-field interpolation circuit, the vector length difference A mixing circuit that outputs a mixed interpolation signal that is changed according to the output of the circuit; A progressive scanning conversion apparatus comprising: a progressive scanning signal output circuit outputs a progressive scanning signal from the signal and the signal of the current field.

Next, the operation of the present invention will be described.

According to the present invention, an accurate motion vector is detected by performing the median filter processing on the motion vector of each block, and an interpolation signal is generated. Can be.

Further, according to the present invention, an accurate motion vector is detected by performing the average value filtering process on the motion vector of each block, and an interpolation signal is generated, so that a progressive scanning signal with little image quality deterioration is obtained. be able to.

Further, according to the present invention, the average value filtering process is performed on the motion vectors of the blocks arranged in the row direction, and the respective outputs are subjected to the median value filtering process to detect an accurate motion vector. Since an interpolation signal is generated, it is possible to obtain a progressive scanning signal with little image quality deterioration.

Further, according to the present invention, the average value filtering is performed on the motion vectors of the blocks arranged in the column direction, and the respective outputs are subjected to the median value filtering to detect an accurate motion vector. Since an interpolation signal is generated, it is possible to obtain a progressive scanning signal with little image quality deterioration.

Further, according to the present invention, the median filter processing is performed on the motion vectors of the blocks arranged in the row direction, and the respective outputs are subjected to the median filter processing to detect an accurate motion vector. Since an interpolation signal is generated, it is possible to obtain a progressive scanning signal with little image quality deterioration.

Further, according to the present invention, the median filter processing is performed on the motion vectors of the blocks arranged in the column direction, and the respective outputs are subjected to the median filter processing to detect an accurate motion vector. Since an interpolation signal is generated, it is possible to obtain a progressive scanning signal with little image quality deterioration.

[0023]

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

FIG. 1 is a block diagram of a progressive scan conversion apparatus according to a first embodiment of the present invention, wherein 1 and 2 are field memories, 3 is a motion vector detection circuit, 4 is an intra-field interpolation circuit, and 5 is Median filter, 6 is a difference vector detecting circuit, 7 is a moving circuit, 8 is a vector length detecting circuit,
9 is a mixing circuit, and 10 is a sequential scanning signal output circuit.

Hereinafter, the operation of the progressive scan conversion apparatus of FIG. 1 will be described. The field memory 1 receives a 2: 1 interlaced image signal. The field memory 1 outputs a current field image signal, and the field memory 2 outputs a previous field image signal. The image information of the previous field and the image signal of the subsequent field input to the field memory 1 are input to the motion vector detection circuit 3, and a motion vector between frames is detected in block units. FIG. 2 shows a state of a block according to the present embodiment. Both the vertical and horizontal directions are divided into three, and there are a total of nine blocks. Block names are B1 to B in order from the upper left
9 The motion vector detected from each block is
It is input to a median filter 5 and a difference vector detection circuit 6. In the median filter 5, the motion vector of each block output from the motion vector detection circuit 3 is calculated in the horizontal direction.
The median in the vertical direction is detected and output as the median of the motion vector.

The difference vector detection circuit 6 calculates the difference between the motion vector of each block output from the motion vector detection circuit 3 and the median value of the motion vector output from the median value filter 5, and reduces the length by ２. Double and output again as the motion vector of each block. The moving circuit 7 moves the image signal of the previous field, which is the output of the field memory 2, according to the motion vector of each block output by the difference vector detecting circuit 6, and outputs an inter-field interpolation signal.

The vector length detection circuit 8 calculates and outputs the length of the motion vector for each block output from the difference vector detection circuit 6. Further, the intra-field interpolation circuit 4 interpolates between the scanning lines of the current field from the image signal of the current field output from the field memory 1 to calculate and output an intra-field interpolation signal. The mixing circuit 9 determines the mixing ratio of the inter-field interpolation signal and the intra-field interpolation signal of each block based on the motion vector length of each block output from the vector length detection circuit 8, and converts the inter-field interpolation signal and the intra-field interpolation signal into each block. Mix and output. That is, if the vector length is long, it is determined that the motion of the image signal between the fields is large, and the mixing ratio of the inter-field interpolation signal is increased. The mixing ratio of the internal interpolation signal is increased. An equation for mixing the inter-field interpolation signal and the intra-field interpolation signal is, for example, equation (1).

[0028]

Y = α * fi + (1−α) * fb (1) (where 0 ≦ α ≦ 1, fi is an intra-field interpolation signal,
fb is an inter-field interpolation signal) The progressive scanning signal output circuit 10 outputs an interpolation signal generated by the mixing circuit 9 between scanning lines of image information of the current field,
Finally, a sequentially scanned image signal is output.

FIG. 3 shows an example of an image. The airplane is located in the center of the image, the background is a mountain, and the sky moves from right to left at a rate of 5 pixels per frame. In this case, the plane and the mountain appear to be stationary. As the motion vector, FIG.
, (0, 0) for blocks B3, B5, B6, B7, B8, and B9, and (-5, 0) for other blocks. When the median of the motion vectors of these nine blocks is calculated, it is (0, 0). When the median vector and the motion vector of each block are calculated by the difference vector detection circuit 6, the result is as shown in FIG. Thereafter, the vector length is detected, and the signal is mixed by the mixing circuit based on the equation (1). As a result, B3, B5, B6, B7, B8, B9
In the block, since the motion vector is (0, 0), the moving circuit 7 does not move the image signal of the previous field, and since the vector length is 0, the output of the intra-field interpolation circuit 4 has priority even in the mixing circuit 9. And a still image is output. Other blocks are treated as moving images, and the moving circuit 7
Is output preferentially.

As described above, according to this embodiment, the median value of the motion vector is calculated from the motion vector of each block of the image signal, and the difference from the motion vector of each block is calculated. By obtaining the inter-field interpolation signal of the block, it is possible to obtain a progressively scanned image signal with little image quality degradation for moving images and still images.

FIG. 6 is a block diagram of a progressive scan conversion apparatus according to a second embodiment of the present invention, wherein 21 and 22 are field memories, 23 is a motion vector detection circuit, and 24
Is an intra-field interpolation circuit, 25 is an average filter, 26
Is a difference vector detection circuit, 27 is a moving circuit, 28 is a vector length detection circuit, 29 is a mixing circuit, and 30 is a sequential scanning signal output circuit.

Hereinafter, the operation of the progressive scan converter of FIG. 6 will be described. 2: 1 in the field memory 21
An interlaced image signal is input to the field memory 2
1 outputs the image signal of the current field, and the field memory 22 outputs the image signal of the previous field. The image information of the previous field and the image signal of the subsequent field input to the field memory 21 are input to a motion vector detection circuit 23, and a motion vector between frames is detected in block units. FIG. 2 shows a state of a block according to the present embodiment. Both the vertical and horizontal directions are divided into three, and there are a total of nine blocks. The block names are B1 to B9 in order from the upper left. The motion vector detected from each block is calculated by the average value filter 25 and the difference vector detection circuit 2.
6 is input. The average filter 25 detects average values in the horizontal and vertical directions from the motion vector of each block output from the motion vector detection circuit 23, and outputs the average value of the motion vector.

The difference vector detection circuit 26 calculates the difference between the motion vector of each block output from the motion vector detection circuit 23 and the average value of the motion vector output from the average value filter 25, and reduces the length by ２. Double and output again as the motion vector of each block. Moving circuit 27
Then, the image signal of the previous field, which is the output of the field memory 22, is moved according to the motion vector of each block output by the difference vector detection circuit 26, and an inter-field interpolation signal is output.

The vector length detection circuit 28 calculates and outputs the length of the motion vector for each block output from the difference vector detection circuit 26. Further, the intra-field interpolation circuit 24 interpolates between the scanning lines of the current field from the image signal of the current field output from the field memory 21 to calculate and output an intra-field interpolation signal. The mixing circuit 29 determines the mixing ratio of the inter-field interpolation signal and the intra-field interpolation signal of each block based on the motion vector length of each block output from the vector length detection circuit 28, and converts the inter-field interpolation signal and the intra-field interpolation signal into each block. Mix and output. That is, if the vector length is long, it is determined that the motion of the image signal between the fields is large, and the mixing ratio of the inter-field interpolation signal is increased. The mixing ratio of the internal interpolation signal is increased. As an equation for mixing the inter-field interpolation signal and the intra-field interpolation signal, there is, for example, equation (1).

[0035]

Y = α * fi + (1−α) * fb (1) (where 0 ≦ α ≦ 1, fi is an intra-field interpolation signal,
fb is an inter-field interpolation signal) The progressive scanning signal output circuit 30 outputs an interpolation signal generated by the mixing circuit 29 between scanning lines of image information of the current field, and finally outputs a progressive scanning image signal.

FIG. 7 shows an example of an image. There is a human in the center of the image, a house on the right, and a tree on the left. The screen moves from left to right at a rate of two pixels per frame, that is, pans. In this case, the motion vectors are (2, 0) for all blocks as shown in FIG. When the average value of the motion vectors of these nine blocks is calculated, (2,
0), and the average vector and the motion vector of each block are calculated by the difference vector detection circuit 26.
Is (0,0) in all the blocks as shown in FIG. Thereafter, the vector length is detected, and the signals are mixed in the mixing circuit 29 based on the equation (1). As a result, since the motion vector is (0, 0) in all blocks, the moving circuit 2
7, the image signal of the previous field is not moved.
Further, since the vector length is 0, the output of the intra-field interpolation circuit 24 is given priority over the entire image even in the mixing circuit 29, and is output as a still image.

As described above, according to this embodiment, the average value of the motion vector is calculated from the motion vector of each block of the image signal, and the difference from the motion vector of each block is calculated. By obtaining the inter-field interpolation signal of the block, it is possible to obtain a progressively scanned image signal with little image quality deterioration for a panned image.

FIG. 10 is a block diagram of a progressive scan conversion apparatus according to a third embodiment of the present invention.
Is a field memory, 33 is a motion vector detection circuit, 3
Reference numerals 4, 35 and 36 denote mean value filters, 37 denotes a median filter, 38 denotes an intra-field interpolation circuit, 39 denotes a difference vector detection circuit, 40 denotes a movement circuit, 41 denotes a vector length detection circuit, 42 denotes a mixing circuit, and 43 denotes a sequential circuit. This is a scanning signal output circuit.

The operation of the progressive scan converter shown in FIG. 10 will be described below. The field memory 31 has 2:
One interlaced image signal is input, an image signal of the current field is output from the field memory 31, and an image signal of the previous field is output from the field memory 32.
The image information of the previous field and the image signal of the subsequent field input to the field memory 21 are input to a motion vector detection circuit 33, and a motion vector between frames is detected in block units. FIG. 2 shows a state of a block according to the present embodiment. Both the vertical and horizontal directions are divided into three, and there are a total of nine blocks. The block names are B1 to B9 in order from the upper left. The motion vector detected from each block is input to the average value filters 34, 35, 36 and the difference vector detection circuit 39. The average filter 34 calculates the average value of the motion vectors of the B1, B2, and B3 blocks. The average filter 35 calculates the average value of the motion vectors of the B4, B5, and B6 blocks.
The average value of the motion vectors of the blocks 7, 8, and 9 is calculated and input to the median filter 37. The median filter 37 calculates a median from the three inputs.

The difference vector detection circuit 39 calculates the difference between the motion vector of each block output from the motion vector detection circuit 33 and the median value of the motion vector output from the median filter 37, and reduces the length by １ ／. Double and output again as the motion vector of each block. Moving circuit 40
Then, the image signal of the previous field, which is the output of the field memory 32, is moved according to the motion vector of each block output by the difference vector detection circuit 39, and the inter-field interpolation signal is output.

The vector length detection circuit 41 calculates and outputs the length of the motion vector for each block output from the difference vector detection circuit 39. The intra-field interpolation circuit 38 interpolates between the scanning lines of the current field from the image signal of the current field output from the field memory 31 to calculate and output an intra-field interpolation signal. The mixing circuit 42 determines the mixing ratio of the inter-field interpolation signal and the intra-field interpolation signal of each block based on the motion vector length of each block output from the vector length detection circuit 41, and converts the inter-field interpolation signal and the intra-field interpolation signal. Mix and output. That is, if the vector length is long, it is determined that the motion of the image signal between the fields is large, and the mixing ratio of the inter-field interpolation signal is increased. The mixing ratio of the internal interpolation signal is increased. As an equation for mixing the inter-field interpolation signal and the intra-field interpolation signal, there is, for example, equation (1).

[0042]

Y = α * fi + (1−α) * fb (1) (where 0 ≦ α ≦ 1, fi is an intra-field interpolation signal,
fb is an inter-field interpolation signal) The progressive scanning signal output circuit 43 outputs an interpolation signal generated by the mixing circuit 42 between scanning lines of image information of the current field, and finally outputs a progressive scanning image signal.

FIG. 7 shows an example of an image. There is a human in the center of the image, a house on the right, and a tree on the left. The screen moves from left to right at a rate of two pixels per frame, that is, pans. In this case, the motion vectors are (2, 0) for all blocks as shown in FIG. B1, B2
The average value of the motion vector of the B3 block is (2, 0),
The average value of the motion vectors of the blocks 4, B5, and B6 is (2, 0), and the average value of the motion vectors of the B7, B8, and B9 blocks is (2, 0). ). When the median vector and the motion vector of each block are calculated by the difference vector detection circuit 39, it becomes (0, 0) for all blocks as shown in FIG. Thereafter, the vector length is detected, and the signal is mixed by the mixing circuit 42 based on the equation (1). As a result, since the motion vector is (0, 0) in all blocks, the moving circuit 40 does not move the image signal of the previous field. Also, since the vector length is 0, the mixing circuit 4
Even in the case of 2, the output of the intra-field interpolation circuit 38 is given priority over the entire image and is output as a still image.

As described above, according to this embodiment, the average value of the motion vector in the row direction is calculated first from the motion vector of each block of the image signal, and then the median value of the average values is calculated. By calculating the difference between the motion vector of each block and the inter-field interpolation signal of each block according to the difference vector, it is possible to obtain a progressively scanned image signal with less image quality deterioration for a panned image.

FIG. 11 is a block diagram of a progressive scan conversion apparatus according to a fourth embodiment of the present invention.
Is a field memory, 53 is a motion vector detection circuit, 5
4, 55 and 56 are average filters, 57 is a median filter, 58 is an intra-field interpolation circuit, 59 is a difference vector detection circuit, 60 is a moving circuit, 61 is a vector length detection circuit, 62 is a mixing circuit, and 63 is a sequential circuit. This is a scanning signal output circuit.

The operation of the progressive scan converter shown in FIG. 11 will be described below. In the field memory 51:
One interlaced image signal is input, an image signal of the current field is output from the field memory 51, and an image signal of the previous field is output from the field memory 52.
The image information of the previous field and the image signal of the subsequent field input to the field memory 51 are input to a motion vector detection circuit 53, and a motion vector between frames is detected in block units. FIG. 2 shows a state of a block according to the present embodiment. Both the vertical and horizontal directions are divided into three, and there are a total of nine blocks. The block names are B1 to B9 in order from the upper left. The motion vector detected from each block is input to average value filters 54, 55, 56 and a difference vector detection circuit 59. The average value filter 54 calculates the average value of the motion vectors of the B1, B4, and B7 blocks, the average value filter 55 calculates the average value of the motion vectors of the B2, B5, and B8 blocks.
The average value of the motion vectors of the 3, B6, and B9 blocks is calculated and input to the median filter 57. The median filter 57 calculates a median from the three inputs.

The difference vector detection circuit 59 calculates the difference between the motion vector of each block output from the motion vector detection circuit 53 and the median value of the motion vector output from the median filter 57, and reduces the length by １ ／. Double and output again as the motion vector of each block. Moving circuit 60
Then, the image signal of the previous field, which is the output of the field memory 52, is moved according to the motion vector of each block output by the difference vector detection circuit 59, and an inter-field interpolation signal is output.

The vector length detection circuit 61 calculates and outputs the length of the motion vector for each block output from the difference vector detection circuit 59. The intra-field interpolation circuit 58 interpolates between the scanning lines of the current field from the image signal of the current field output from the field memory 51, calculates and outputs an intra-field interpolation signal. The mixing circuit 62 determines the mixing ratio of the inter-field interpolation signal and the intra-field interpolation signal of each block based on the motion vector length of each block output from the vector length detection circuit 51, and converts the inter-field interpolation signal and the intra-field interpolation signal. Mix and output. That is, if the vector length is long, it is determined that the motion of the image signal between the fields is large, and the mixing ratio of the inter-field interpolation signal is increased. The mixing ratio of the internal interpolation signal is increased. An equation for mixing the inter-field interpolation signal and the intra-field interpolation signal is, for example, equation (1).

[0049]

Y = α * fi + (1−α) * fb (1) (where 0 ≦ α ≦ 1, fi is an intra-field interpolation signal,
fb is an inter-field interpolation signal) The progressive scanning signal output circuit 63 outputs an interpolation signal generated by the mixing circuit 62 between scanning lines of image information of the current field, and finally outputs a progressive scanning image signal.

FIG. 7 shows an example of an image. There is a human in the center of the image, a house on the right, and a tree on the left. The screen moves from left to right at a rate of two pixels per frame, that is, pans. In this case, the motion vectors are (2, 0) for all blocks as shown in FIG. B1, B4
The average value of the motion vector of the B7 block is (2, 0),
The average value of the motion vectors of the B2, B5, and B8 blocks is (2, 0), and the average value of the motion vectors of the B3, B6, and B9 blocks is (2, 0). ). When the median vector and the motion vector of each block are calculated by the difference vector detection circuit 59, (0, 0) is obtained for all the blocks as shown in FIG. Thereafter, the vector length is detected, and the signals are mixed in the mixing circuit 62 based on the equation (1). As a result, since the motion vector is (0, 0) in all blocks, the moving circuit 60 does not move the image signal of the previous field. Also, since the vector length is 0, the mixing circuit 5
Even in 2, the output of the intra-field interpolation circuit 58 is prioritized for the entire image and is output as a still image.

As described above, according to this embodiment, the average value of the motion vector in the column direction is calculated first from the motion vector of each block of the image signal, and then the median value of the average values is calculated. By calculating the difference between the motion vector of each block and the inter-field interpolation signal of each block according to the difference vector, it is possible to obtain a progressively scanned image signal with less image quality deterioration for a panned image.

FIG. 12 is a block diagram of a progressive scan conversion apparatus according to a fifth embodiment of the present invention.
Is a field memory, 73 is a motion vector detection circuit, 7
4, 75 and 76 are median filters, 77 is a median filter, 78 is an intra-field interpolation circuit, 79 is a difference vector detection circuit, 80 is a moving circuit, 81 is a vector length detection circuit, 82 is a mixing circuit, and 83 is a sequential circuit. This is a scanning signal output circuit.

The operation of the progressive scan converter shown in FIG. 12 will be described below. In the field memory 71:
One interlaced image signal is input, an image signal of the current field is output from the field memory 71, and an image signal of the previous field is output from the field memory 72.
The image information of the previous field and the image signal of the subsequent field input to the field memory 71 are input to a motion vector detection circuit 73, and a motion vector between frames is detected in block units. FIG. 2 shows a state of a block according to the present embodiment. Both the vertical and horizontal directions are divided into three, and there are a total of nine blocks. The block names are B1 to B9 in order from the upper left. The motion vector detected from each block is input to the median filters 54, 55, 56 and the difference vector detection circuit 79. The median filter 74 calculates the median value of the motion vectors of the B1, B2, and B3 blocks, the median filter 75 calculates the median value of the motion vectors of the B4, B5, and B6 blocks.
The median value of the motion vectors of the blocks 7, B8 and B9 is calculated and input to the median value filter 77. The median filter 77 calculates a median from the three inputs.

The difference vector detection circuit 79 calculates the difference between the motion vector of each block output from the motion vector detection circuit 73 and the median value of the motion vector output from the median filter 77, and reduces the length by ２. Double and output again as the motion vector of each block. Moving circuit 80
Then, the image signal of the previous field, which is the output of the field memory 72, is moved according to the motion vector of each block output by the difference vector detection circuit 79, and an inter-field interpolation signal is output.

The vector length detection circuit 81 calculates and outputs the length of the motion vector for each block output from the difference vector detection circuit 79. Further, the intra-field interpolation circuit 78 interpolates between the scanning lines of the current field from the image signal of the current field output from the field memory 71 to calculate and output an intra-field interpolation signal. The mixing circuit 82 determines the mixing ratio between the inter-field interpolation signal and the intra-field interpolation signal of each block based on the motion vector length of each block output from the vector length detection circuit 81, and converts the inter-field interpolation signal and the intra-field interpolation signal. Mix and output. That is, if the vector length is long, it is determined that the motion of the image signal between the fields is large, and the mixing ratio of the inter-field interpolation signal is increased. The mixing ratio of the internal interpolation signal is increased. An equation for mixing the inter-field interpolation signal and the intra-field interpolation signal is, for example, equation (1).

[0056]

Y = α * fi + (1−α) * fb (1) (where 0 ≦ α ≦ 1, fi is an intra-field interpolation signal,
fb is an inter-field interpolation signal) The progressive scanning signal output circuit 83 outputs an interpolation signal generated by the mixing circuit 82 between scanning lines of image information of the current field, and finally outputs a progressive scanning image signal.

FIG. 7 shows an example of an image. There is a human in the center of the image, a house on the right, and a tree on the left. The screen moves from left to right at a rate of two pixels per frame, that is, pans. In this case, the motion vectors are (2, 0) for all blocks as shown in FIG.

The median value of the motion vectors of the B1, B2, and B3 blocks is (2, 0), the median value of the motion vectors of the B4, B5, and B6 blocks is (2, 0), and the motion vector of the B7, B8, and B9 blocks. Is (2,0), and when the median is calculated from these, it is (2,0). When the median vector and the motion vector of each block are calculated by the difference vector detection circuit 79, (0, 0) is obtained for all the blocks as shown in FIG. Thereafter, the vector length is detected, and the signal is mixed by the mixing circuit 82 based on the equation (1). As a result, since the motion vector is (0, 0) in all blocks, the moving circuit 80 does not move the image signal of the previous field. Since the vector length is 0, the output of the intra-field interpolation circuit 78 is given priority over the entire image even in the mixing circuit 82, and is output as a still image.

As described above, according to this embodiment, the median value of the motion vector in the row direction is first calculated from the motion vector of each block of the image signal, and then the median value is calculated from the median values. By calculating the difference between the motion vector of each block and the inter-field interpolation signal of each block according to the difference vector, it is possible to obtain a progressively scanned image signal with less image quality deterioration for a panned image.

FIG. 13 is a block diagram of a progressive scan conversion apparatus according to a sixth embodiment of the present invention.
Is a field memory, 93 is a motion vector detection circuit, 9
4, 95, 96 are average filters, 97 is a median filter, 98 is an intra-field interpolation circuit, 99 is a difference vector detection circuit, 100 is a moving circuit, 101 is a vector length detection circuit, 102 is a mixing circuit, and 103 is a sequential circuit. This is a scanning signal output circuit.

Hereinafter, the operation of the progressive scan conversion device of FIG. 13 will be described. In the field memory 91:
One interlaced image signal is input, an image signal of the current field is output from the field memory 91, and an image signal of the previous field is output from the field memory 92.
The image information of the previous field and the image signal of the subsequent field input to the field memory 91 are input to a motion vector detection circuit 93, and a motion vector between frames is detected in block units. FIG. 2 shows a state of a block according to the present embodiment. Both the vertical and horizontal directions are divided into three, and there are a total of nine blocks. The block names are B1 to B9 in order from the upper left. The motion vector detected from each block is input to median filters 94, 95, 96 and a difference vector detection circuit 99. The median filter 94 calculates the median value of the motion vectors of the B1, B4, and B7 blocks, the median filter 95 calculates the median value of the motion vectors of the B2, B5, and B8 blocks.
The median of the motion vectors of the 3, B6, and B9 blocks is calculated and input to the median filter 97. The median filter 97 calculates a median from the three inputs.

The difference vector detection circuit 99 calculates the difference between the motion vector of each block output from the motion vector detection circuit 93 and the median value of the motion vector output from the median value filter 97, and reduces the length by ２. Double and output again as the motion vector of each block. Moving circuit 10
At 0, the image signal of the previous field, which is the output of the field memory 92, is moved in accordance with the motion vector of each block output by the difference vector detection circuit 99, and an inter-field interpolation signal is output.

The vector length detection circuit 101 calculates and outputs the length of the motion vector for each block output from the difference vector detection circuit 99. Further, the intra-field interpolation circuit 98 interpolates between the scanning lines of the current field from the image signal of the current field output from the field memory 91 to calculate and output an intra-field interpolation signal. The mixing circuit 102 determines the mixing ratio of the inter-field interpolation signal and the intra-field interpolation signal of each block based on the motion vector length of each block output from the vector length detection circuit 71,
The inter-field interpolation signal and the intra-field interpolation signal are mixed and output. That is, if the vector length is long, it is determined that the motion of the image signal between the fields is large, and the mixing ratio of the inter-field interpolation signal is increased. The mixing ratio of the internal interpolation signal is increased. An equation for mixing the inter-field interpolation signal and the intra-field interpolation signal is, for example, equation (1).

[0064]

Y = α * fi + (1−α) * fb (1) (where 0 ≦ α ≦ 1, fi is an intra-field interpolation signal,
fb is an inter-field interpolation signal) The progressive scanning signal output circuit 103 outputs an interpolation signal generated by the mixing circuit 102 between scanning lines of image information of the current field, and finally outputs a progressive scanning image signal.

FIG. 7 shows an example of an image. There is a human in the center of the image, a house on the right, and a tree on the left. The screen moves from left to right at a rate of two pixels per frame, that is, pans. In this case, the motion vectors are (2, 0) for all blocks as shown in FIG. B1, B4
The median of the motion vectors of the B7 block is (2,0), B
The median value of the motion vectors of the blocks B2, B5, and B8 is (2, 0), and the median value of the motion vectors of the blocks B3, B6, and B9 is (2, 0). ). When the median vector and the motion vector of each block are calculated by the difference vector detection circuit 99, it becomes (0, 0) for all the blocks as shown in FIG. Thereafter, the vector length is detected, and the signal is mixed by the mixing circuit 102 based on the equation (1). As a result, since the motion vector is (0, 0) in all blocks, the moving circuit 100 does not move the image signal of the previous field. Further, since the vector length is 0, the output of the intra-field interpolation circuit 98 is given priority over the entire image even in the mixing circuit 102, and is output as a still image.

As described above, according to this embodiment, the median value of the motion vector in the column direction is calculated first from the motion vector of each block of the image signal, and then the median value is calculated from the median values. By calculating the difference between the motion vector of each block and the inter-field interpolation signal of each block according to the difference vector, it is possible to obtain a progressively scanned image signal with less image quality deterioration for a panned image.

In the first, second, third, fourth, fifth, and sixth embodiments, the image is divided into nine blocks and motion vectors are extracted. It goes without saying that a shape may be used.

Further, each means and circuit of the present invention may be realized by hardware or software.

The medium claim of the present invention is a medium such as an FD storing a program for realizing all or a part of each function of each means of the present invention.

[0070]

As described above, according to the present invention, the median value of the motion vector is calculated from the motion vector of each block of the image signal, the difference from the motion vector of each block is calculated, and each of the blocks is calculated according to the difference vector. By obtaining the inter-field interpolation signal of the block, it is possible to obtain a progressively scanned image signal with little image quality deterioration for a moving image and a still image, and the practical effect is large.

According to the present invention, the average value of the motion vector is calculated from the motion vector of each block of the image signal,
By calculating the difference between the motion vector of each block and the inter-field interpolation signal of each block according to the difference vector, it is possible to obtain a progressively scanned image signal with less image quality degradation for a panned image, Its practical effect is great.

According to the present invention, the average value of the motion vectors in the row direction is calculated first from the motion vector of each block of the image signal, and then the median value of the average values is calculated. By obtaining the inter-field interpolation signal of each block according to the difference vector, it is possible to obtain a progressively scanned image signal with little image quality deterioration for a panned image. large.

According to the present invention, the average value of the motion vector in the column direction is calculated first from the motion vector of each block of the image signal, and then the median value of the average values is calculated. By obtaining the inter-field interpolation signal of each block according to the difference vector, it is possible to obtain a progressively scanned image signal with little image quality deterioration for a panned image. large.

According to the present invention, the median value of the motion vector in the row direction is first calculated from the motion vector of each block of the image signal, and then the median value is calculated from the median values. By obtaining the inter-field interpolation signal of each block according to the difference vector, it is possible to obtain a progressively scanned image signal with little image quality deterioration for a panned image. large.

According to the present invention, the median value of the motion vector in the column direction is first calculated from the motion vector of each block of the image signal, and then the median value is calculated from the median values. By obtaining the inter-field interpolation signal of each block according to the difference vector, it is possible to obtain a progressively scanned image signal with little image quality deterioration for a panned image. large.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a progressive scan conversion device according to a first embodiment of the present invention.

FIG. 2 is a conceptual diagram of image block division according to the embodiment of the present invention.

FIG. 3 is a diagram showing a test image according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a motion vector of each block according to the first embodiment of the present invention.

FIG. 5 is a diagram illustrating an output of the difference vector detection circuit according to the first embodiment of the present invention.

FIG. 6 is a configuration diagram of a progressive scan conversion device according to a second embodiment of the present invention.

FIG. 7 is a diagram showing test images according to the second, third, fourth, fifth, and sixth embodiments of the present invention.

FIG. 8 is a diagram showing a motion vector of each block in the second, third, fourth, fifth, and sixth embodiments of the present invention.

FIG. 9 is a diagram illustrating an output of a difference vector detection circuit according to the second, third, fourth, fifth, and sixth embodiments of the present invention.

FIG. 10 is a configuration diagram of a progressive scan conversion device according to a third embodiment of the present invention.

FIG. 11 is a configuration diagram of a progressive scan conversion device according to a fourth embodiment of the present invention.

FIG. 12 is a configuration diagram of a progressive scan conversion device according to a fifth embodiment of the present invention.

FIG. 13 is a configuration diagram of a progressive scan conversion device according to a sixth embodiment of the present invention.

FIG. 14 is a schematic diagram of a conventional scanning line interpolation device.

[Explanation of symbols]

1, 2, 21, 22, 31, 32, 51 Field memory 52, 71, 72, 91, 92 112, 113, 11
4 Field memory 3, 23, 33, 53, 73, 93, 121 Motion vector detection circuit 4, 24, 38, 58, 78, 98 In-field interpolation circuit 5, 37, 57, 74, 75 Median filter 76, 77 , 94, 95, 96, 97 Median filter 6, 26, 39, 59, 79, 99 Difference vector detection circuit 7, 27, 40, 60, 80, 100 Moving circuit 8, 28, 41, 61, 81, 101 Vector length detection circuit 9, 29, 42, 62, 82, 102, 116 Mixing circuit 10, 30, 43, 63, 83, 103 Sequential scanning signal output circuit 25, 34, 35, 36, 54, 55, 56 Average value Filter 111 Interlace signal input 115 Motion detection circuit 117, 118 Time axis conversion circuit 119 Switching circuit 120 Sequential scanning signal output 122 Moving circuit

Claims (9)

[Claims] 1. A first field memory for delaying an input signal by one field, a second field memory for delaying an output signal of the first field memory by one field,
An intra-field interpolation circuit for outputting an intra-field interpolation signal obtained by interpolating only the image signal of the current field from the output of the first field memory, and detecting a motion vector between frames in block units from the input signal and the output of the second field memory A motion vector detection circuit, and a vertical motion vector output from each block of the motion vector detection circuit.
A median filter that takes a median value of horizontal components and outputs the vector as a vector, a difference vector detection circuit that detects a difference between vectors from a motion vector output of each block of the motion vector detection circuit and a vector output of the median filter, A moving circuit that outputs an inter-field interpolation signal obtained by moving the image signal of the previous field by the difference vector detected by the difference vector detection circuit, and a vector that detects the vector length of the difference vector detected by the difference vector detection circuit A length detection circuit, a mixing circuit that outputs a mixed interpolation signal by changing a mixing ratio of the output of the moving circuit and the output of the intra-field interpolation circuit according to the output of the vector length difference circuit, and the interpolation signal. A progressive scanning signal output circuit for outputting a progressive scanning signal from the signal of the current field. Sequential scanning conversion apparatus according to claim. 2. A first field memory for delaying an input signal by one field, a second field memory for delaying an output signal of the first field memory by one field,
An intra-field interpolation circuit for outputting an intra-field interpolation signal obtained by interpolating only the image signal of the current field from the output of the first field memory, and detecting a motion vector between frames in block units from the input signal and the output of the second field memory A motion vector detection circuit, and a vertical motion vector output from each block of the motion vector detection circuit.
An average value filter that takes an average value of horizontal components and outputs it as a vector, a difference vector detection circuit that detects a vector difference from a motion vector output of each block of the motion vector detection circuit and a vector output of the average value filter, A moving circuit that outputs an inter-field interpolation signal obtained by moving the image signal of the previous field by the difference vector detected by the difference vector detection circuit, and a vector that detects the vector length of the difference vector detected by the difference vector detection circuit A length detection circuit, a mixing circuit that outputs a mixed interpolation signal by changing a mixing ratio of the output of the moving circuit and the output of the intra-field interpolation circuit according to the output of the vector length difference circuit, and the interpolation signal. A progressive scanning signal output circuit for outputting a progressive scanning signal from the signal of the current field. Sequential scanning conversion apparatus according to claim. 3. A first field memory for delaying an input signal by one field, a second field memory for delaying an output signal of the first field memory by one field,
An intra-field interpolation circuit for outputting an intra-field interpolation signal obtained by interpolating only the image signal of the current field from the output of the first field memory, and detecting a motion vector between frames for each block from the input signal and the output of the second field memory Motion vector detecting circuit, a first average value filter for outputting an average value of the motion vector of the block in the first row of the output of the motion vector detecting circuit, and a second row of the output of the motion vector detecting circuit. A second average value filter that outputs an average value of the motion vector of the block, a third average value filter that outputs an average value of the motion vector of the block in the third row of the output of the motion vector detection circuit, A median filter for detecting a median from output values of the average filter, the second average filter, and the third average filter; Vector detection circuit for detecting the difference between the vector from the output of the vector detection circuit and the output of the median filter, and inter-field interpolation by moving the image signal of the previous field by the difference vector detected by the difference vector detection circuit A moving circuit that outputs a signal, a vector length detection circuit that detects a vector length of the difference vector detected by the difference vector detection circuit,
A mixing circuit that outputs a mixed interpolation signal by changing a mixing ratio between the output of the moving circuit and the output of the intra-field interpolation circuit in accordance with the output of the vector length difference circuit; and And a progressive scan signal output circuit for outputting a progressive scan signal. 4. A first field memory for delaying an input signal by one field, a second field memory for delaying an output signal of the first field memory by one field,
An intra-field interpolation circuit for outputting an intra-field interpolation signal obtained by interpolating only the image signal of the current field from the output of the first field memory, and detecting a motion vector between frames in block units from the input signal and the output of the second field memory And a first average value filter for taking an average value of vertical and horizontal components from the motion vector output of the block in the first column of the motion vector output of each block of the motion vector detection circuit, and outputting as a vector And a second average filter for taking an average value of vertical and horizontal components from the motion vector output of the block in the second column of the output of the motion vector detection circuit, and outputting the vector as a vector. From the motion vector output of the block in the third column, take the average value of the vertical and horizontal components A third average value filter for outputting,
A median filter that takes the median of the vertical and horizontal components from the vector outputs of the first average filter, the second average filter, and the third average filter, and outputs the vector as a vector; And a difference vector detection circuit for detecting a vector difference from the vector output of the median filter, and a movement for outputting an inter-field interpolation signal obtained by moving the image signal of the previous field by the difference vector detected by the difference vector detection circuit A vector length detection circuit for detecting a vector length of a difference vector detected by the difference vector detection circuit; and a mixing ratio of an output of the moving circuit and an output of the intra-field interpolation circuit to an output of the vector length difference circuit. A mixing circuit that outputs an interpolated signal mixed by changing according to Progressive scan conversion device characterized by comprising a sequential scanning signal output circuit outputs a progressive scanning signal from the field signal. 5. A first field memory for delaying an input signal by one field, a second field memory for delaying an output signal of the first field memory by one field,
An intra-field interpolation circuit for outputting an intra-field interpolation signal obtained by interpolating only the image signal of the current field from the output of the first field memory, and detecting a motion vector between frames in block units from the input signal and the output of the second field memory And a median filter 1 for taking the median of vertical and horizontal components from the motion vector output of the block in the first row of the motion vector output of each block of the motion vector detection circuit, and outputting as a vector
A median filter 2 that takes the median of the vertical and horizontal components from the motion vector output of the block on the second row of the output of the motion vector detection circuit and outputs it as a vector; From the motion vector output of the block in the third row, take the median of the vertical and horizontal components,
A median filter 3 that outputs a vector, a median filter that takes the median of vertical and horizontal components from the vector output of the median filter 1, the median filter 2, and the median filter 3 and outputs the vector as a vector; A difference vector detection circuit for detecting a difference between vectors from the motion vector output of each block of the motion vector detection circuit and the output of the median filter, and an image signal of a previous field by the difference vector detected by the difference vector detection circuit. A moving circuit that outputs a moved inter-field interpolation signal; a vector length detecting circuit that detects a vector length of a difference vector detected by the difference vector detecting circuit; an output of the moving circuit and an output of the intra-field interpolation circuit And changing the mixing ratio according to the output of the vector length difference circuit. A mixing circuit for outputting an interpolation signal, progressive scan conversion device, characterized in that it comprises a sequential scanning signal output circuit outputs a progressive scanning signal from the signal of the interpolation signal and the current field. 6. A first field memory for delaying an input signal by one field, a second field memory for delaying an output signal of the first field memory by one field,
An intra-field interpolation circuit for outputting an intra-field interpolation signal obtained by interpolating only the image signal of the current field from the output of the first field memory, and detecting a motion vector between frames in block units from the input signal and the output of the second field memory And a median filter 1 for taking the median of vertical and horizontal components from the motion vector output of the block in the first column of the motion vector output of each block of the motion vector detection circuit, and outputting as a vector
A median filter 2 that takes the median of the vertical and horizontal components from the motion vector output of the block in the second column of the output of the motion vector detection circuit and outputs it as a vector; Take the median of the vertical and horizontal components from the motion vector output of the block in the third column,
A median filter 3 that outputs a vector, a median filter that takes the median of vertical and horizontal components from the vector output of the median filter 1, the median filter 2, and the median filter 3 and outputs the vector as a vector; A difference vector detection circuit for detecting a difference between vectors from the motion vector output of each block of the motion vector detection circuit and the output of the median filter, and an image signal of a previous field by the difference vector detected by the difference vector detection circuit. A moving circuit that outputs a moved inter-field interpolation signal; a vector length detecting circuit that detects a vector length of a difference vector detected by the difference vector detecting circuit; an output of the moving circuit and an output of the intra-field interpolation circuit And changing the mixing ratio according to the output of the vector length difference circuit. A mixing circuit for outputting an interpolation signal, progressive scan conversion device, characterized in that it comprises a sequential scanning signal output circuit outputs a progressive scanning signal from the signal of the interpolation signal and the current field. 7. The progressive scan conversion device according to claim 1, wherein said vector length detection circuit obtains a vector length by adding absolute values of horizontal and vertical vector components. . 8. The vector length detecting circuit according to claim 1, wherein the vector length is obtained by a look-up table which receives absolute values of horizontal and vertical vector components.
7. The progressive scan conversion device according to any one of claims 1 to 6. 9. A medium storing a program for realizing all or a part of the function of each means or circuit.