JP3022977B2 - Television signal interpolation method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television signal interpolation method that involves a motion correction process using a motion vector.

[Prior Art] The technique of performing motion compensation using a motion vector is used to improve the inter-frame coding efficiency in high-efficiency coding of a television signal, or to perform motion compensation by changing the number of fields in television format conversion. Used to reduce continuity.

The detection of the motion vector is performed by converting the television signal into m pixels ×
It is divided into blocks of n lines (m and n are integers), and the detection method is a pattern matching method (Japanese Patent Application Laid-Open No. 55-162683 and 162684) and a repetitive gradient method (Japanese Patent Application Laid-Open
No. 60-158786) is well known.

Next, as an example of an interpolation process using a motion vector, a case where a television system is converted will be described.

For example, in the television system conversion between the PAL system and the NTSC system, mutual conversion between 60 fields and 50 fields is required, and this conversion process is performed using a field memory in units of conversion between 6 fields and 5 fields. In the conversion for increasing the field, some field television signals (hereinafter simply referred to as field signals)
In the conversion for reducing the field, a part of the field signal is skipped. For this reason,
Field discontinuity occurs at repetitions and jump points, which results in discontinuity of the moving image. In order to correct this, a signal of two fields before conversion is generally subjected to a weight addition (linear interpolation) process to form a field signal after conversion.

FIG. 2 shows a linear interpolation process. The signals ca and CB separated by one field are added to the field interpolation ratio α,
(1-α) is added after the load to obtain an interpolation signal cc.
Here, the field interpolation ratio α is a constant determined from the positional relationship on the time axis between the pre-conversion signals ca and cb and the post-conversion signal cc.

However, this linear interpolation process has a problem with moving images. FIG. 3 shows linear interpolation for a moving image (movement of a circle), and similarly shows a case where an interpolation signal PC is obtained from pre-conversion signals PA and PB separated by one field. In addition, while FIG. 2 shows a pixel,
FIG. 3 shows an entire one-field image.

The shaded area in the interpolation signal PC is obtained by weight addition of the uncorresponding background part and the moving image part, and the level is changed by the field interpolation ratio, and this part is the cause of jerkiness. Has become.

The interpolation method using a motion vector is for reducing the occurrence of this jerkiness, and FIG. 4 corresponding to FIG. 3 shows the basic concept. Before conversion P
A and PB are used to detect a motion vector of a circle as a moving object, and a motion correction for the moving object is performed by using a value αV obtained by multiplying the motion vector V by a field interpolation ratio α to generate an interpolation signal PD. It has gained.

However, it is difficult for the detected motion vector to capture 100% of the motion of all the moving images accurately, and in some cases, an error may occur. The following may not be performed. Therefore, in the interpolation processing through the motion correction using the value αV, the two signals do not completely overlap, and in the practical motion interpolation processing, the weight addition processing using the field interpolation ratio is further performed on the motion-corrected signal. Has been given.

FIG. 5 shows a configuration of a motion interpolation section in a conventional television system conversion apparatus which performs a linear interpolation process after performing motion correction on each field signal (1989).
Proceedings 20-5, "Motion vector detection and motion interpolation method of TV system converter", Japanese Patent Laid-Open No. 1-309597.

In FIG. 5, a current field signal S1 and a previous field signal S2 are supplied to a motion vector detection circuit 1. The motion vector detection circuit 1 uses these signals S1 and S2 to detect a motion vector for each block obtained by dividing one field into a plurality. The motion vector S3 (V) is input to the motion vector correction circuit 2 and the adaptive motion interpolation switching control circuit 3.

The motion vector correction circuit 2 corrects the motion vector V with the field interpolation ratio α, and stores the corrected motion vectors S4 (αV) and S5 {(1-α) V} in the corresponding motion correction memories 4 Give 5

Each of the motion correction memories 4 and 5 stores a correction motion vector α
V, the signal S obtained by shifting the coordinates of the target block of the previous field signal S2 or the current field signal S1 by (1-α) V.
6. Form and output S7. The difference between these signals S6 and S7 is obtained by a subtraction circuit 6 for each pixel, and the difference is converted into an absolute value by an absolute value conversion / accumulation circuit 7 and then accumulated for each interpolation block to obtain an interpolation block. It is provided to the above-described adaptive motion interpolation switching control circuit 3 as a motion correction inter-field difference signal S8 for each motion.

The output signals S6 and S7 from the memories 4 and 5 are given to the corresponding multiplication circuits 8 and 9, and after the multiplication circuits 8 and 9 load the field interpolation ratio α and (1−α), The addition is performed by the addition circuit 10 to obtain a motion compensation field interpolation signal S9. The motion compensation field interpolation signal S9 is provided to the multiplication circuit 11.

The current field signal S1 and the previous field signal S2 are also provided to the subtraction circuit 12. A difference for each pixel between the field signals S1 and S2 is obtained by a subtraction circuit 12, and the difference is converted to an absolute value by an absolute value conversion / accumulation circuit 13, and then accumulated for each interpolation block to perform interpolation. It is provided to the above-described adaptive motion interpolation switching control circuit 3 as an uncorrected inter-field difference signal S10 for each block.

Further, the previous field signal S2 and the current field signal S1 are supplied to the corresponding multiplication circuits 14 and 15, and the respective multiplication circuits 14 and 15
After that, the field interpolation ratio α, (1−α) is weighted, and then added by the addition circuit 16 to form a linear interpolation signal S11. The linear interpolation signal S11 is provided to the multiplication circuit 17.

The adaptive motion interpolation switching control circuit 3 outputs a motion compensation field interpolation signal S9 or a linear interpolation signal S1 as a motion interpolation signal.
This is a circuit for determining whether to output 1 or to output both weighted addition signals, and determines the magnitude of the motion vector V, the motion-compensated inter-field difference signal S8, and the uncorrected inter-field difference signal S10 as parameters. , And outputs adaptive interpolation switching signals S12 (β) and S13 (1−β) to the corresponding multiplication circuits 11 and 17 for each interpolation block.

Thus, the multiplication circuit 11 outputs a signal obtained by multiplying the motion compensation field interpolation signal S9 by β, the multiplication circuit 17 outputs a signal obtained by multiplying the linear interpolation signal S11 by (1−β), and these signals are added to the addition circuit 18 Are added to form a final motion interpolation signal S12.

Next, the details of the motion vector detection circuit 1 will be described in detail, because they relate to the problems of the prior art.

The block size for detecting the motion vector is based on 8 pixels × 8 lines as shown in FIG. 6, and the block size for the selection of the initial displacement vector, which will be described later, and the calculation of the iterative gradient method is larger than that. Pixels x 16 lines (however, every other pixel, 80 pixels every other line are targeted).

FIG. 7 is a block diagram of the motion vector detection circuit 1. The current field signal S1 and the previous field signal S2 are supplied to the corresponding two-dimensional low-pass filters 20, 21, where noise components are removed and high-frequency components are reduced. The filtered set signal of the current field signal and the previous field signal is supplied to an initial displacement vector selection circuit 22, a first gradient method operation circuit 23, and a second gradient method operation circuit 24,
It is stored in the internal memory of each circuit.

The initial displacement vector selection circuit 22 includes a motion vector memory.
An initial deviation vector is selected from the detected motion vectors stored in the storage unit 25 and the motion vectors obtained by appropriately calculating them.

FIG. 8 is an explanatory diagram of candidate vectors used for selection by the initial deviation vector selection circuit 22. For the current field, block A which is vertically adjacent to the detected block
, A block B that is one block ahead of the block A in the horizontal direction, and a block C that is two blocks before the detected block.
Are set as candidate vectors. Also, 1
Before the field, the motion vector of the block N which is advanced by one block in the vertical and horizontal directions from the block J at the position corresponding to the detected block and the average motion vector of 9 blocks F to N centered on the block J are candidates. Vector. Further, from twice the average motion vector of the 9 blocks F to N of the previous field, the center of the block T of the 2nd preceding field corresponding to the detected block is set to 9
A vector (acceleration vector) obtained by subtracting the average motion vector of the blocks PX is set as a candidate vector.

The initial displacement vector selection circuit 22 calculates a pixel difference value between blocks in both fields, for example, after displacing the previous field signal by a candidate vector, and further calculates a total absolute value of the difference values. This operation is performed on all candidate vectors, and the candidate vector having the smallest absolute value total is set as the initial displacement vector.

The first gradient method operation circuit 23 applies the following equations (1) to (4) to the signal of the detected block of the current field and the block signal of the previous field whose coordinates have been shifted by the initial deflection vector (V0). An equation is calculated to find a vector Vp (Vxp, Vyp) to which the gradient method has been applied once.

Vxp = ΣSGNΔX · DFD / Σ | ΔX | (1) Vyp = ΣSGNΔY · DFD / Σ | ΔY | (2) ΔX = (An + 1, m−An−1, m) / 2 (3) ΔY = ( An, m + 1−An, m−1) / 2 (4) (where, An, m is the signal of the coordinate of the nth pixel of the m line, DFD
Is the pixel difference value between fields, and SGN represents the sign.) The initial deviation vector V0 and the vector Vp obtained by applying the gradient method once are added by the adding circuit 26 to obtain the second gradient It is provided to the modulating circuit 24 and the adding circuit 27.

The second gradient method operation circuit 24 performs the same operation as the first gradient method operation circuit 23 using the input vector V0 + Vp,
The obtained vector Vq is provided to the adding circuit 27. Thus,
The motion vector V (V0 + Vp
+ Vq), which is output and provided to the motion vector memory 25.

[Problems to be Solved by the Invention] By the way, in the motion vector detection method using the iterative gradient method, it is better to use a large detection block size in order to improve the detection accuracy of the motion vector. It is known that the detection sensitivity is deteriorated.

Therefore, the block size is determined based on various computer simulations, and the determined block size is the above-described block size.

For ordinary television images, there is almost no problem with this block size. However, signals from computer graphics and signals from CCD television cameras with high-speed shutters have problems because the moving images are clear and the field correlation is small because there is little temporal filtering. ing.

If the size of the moving object is smaller than the motion detection block size and the motion is larger than the motion detection block size, it may be difficult to detect the motion vector. If the level of the background still image is flat, it is still possible to detect the motion vector. However, if the level of the background still image is not flat, the motion vector is a background still image having a large area ratio. Becomes

If the moving object is small in view of the whole image, this motion distortion is not visually noticeable. However, as shown in FIGS. 9 (A) to 9 (B), when a thin vertical line moves at a speed V from a background area BA having a flat still image level to a background area BB having a still image level which is not flat, The motion vector of the vertical line portion with the background BA is V, whereas the motion vector of the vertical line with the region BB as the background is 0. The image becomes a corrected image, and since there is no motion in the area BB, the image becomes a linear interpolation image.
An image distortion as shown in the figure occurs.

The present invention has been made in consideration of the above points, and can reduce distortion of an interpolated image that has occurred when the size of a moving object is small compared to the detection block size of a motion vector. It is intended to provide a television signal interpolation system.

[Means for Solving the Problem] In order to solve the problem, according to the present invention, a digitized television signal is subdivided into blocks of m pixels × n lines, and a motion between signals separated by one field or more for each block is performed. A field (or frame) interpolation signal whose motion has been corrected using the detected motion vector and a field (or frame) interpolation signal without correction are converted to a block size or less for detecting a motion vector. The following means are newly provided in a television signal interpolation system in which switching or weight addition processing is adaptively performed in units of interpolation flocks or pixels having a size of

That is, a temporary vector forming means for averaging the motion vectors whose magnitude of the motion vector around the interpolated block or the interpolated pixel is equal to or larger than the threshold value and obtaining a temporary motion vector of the interpolated block or the interpolated pixel. The magnitude of the inter-field difference value corrected for the provisional motion vector position and the inter-field difference value corrected for the motion vector position detected for each block are compared, and a motion vector having a small difference value is selected. A determination unit and a field (or frame) interpolation signal formed by using either the provisional motion vector or the motion vector detected for each block selected by the determination unit, and a subsequent adaptive interpolation process And means for selecting a field interpolation signal to be applied to the section.

[Operation] In the present invention, in a television signal interpolation method using a motion vector, a motion vector is detected for each block, so that a moving object having an area smaller than the block size cannot detect the motion vector. As a method to reduce the occurrence of distortion in the motion-interpolated image,
The average value of motion vectors around a moving image for which a motion vector cannot be detected is provisionally set as a motion vector of the moving image, and image distortion is reduced by performing motion correction using the provisional motion vector. .

That is, the provisional vector forming means averages the motion vectors in which the magnitude of the motion vector around the interpolated block or the interpolated pixel is equal to or larger than the threshold, and calculates the provisional motion vector of the interpolated block or the interpolated pixel. Obtained and given to the judgment means. The judging means judges pass / fail of the temporary motion vector and the motion vector detected for each block by the motion vector detection circuit based on both motion correction results. The field interpolation signal selection means supplies a field (or frame) interpolation signal formed using a temporary motion vector determined to be good or a detected motion vector for each block to a subsequent adaptive interpolation processing unit.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of this embodiment.

In FIG. 1, a current field signal S21 and a previous field signal S22 are provided to a motion vector detection circuit 31.
The motion vector detection circuit 31 detects the current field signal S21
Then, a motion vector is detected for each block obtained by dividing one field into a predetermined size using the previous field signal S22. The detection of the motion vector is performed by, for example, selecting an initial displacement vector as in the related art, and then applying a repetitive gradient operation twice. Detected motion vector S23
(V) is input to the average motion vector calculation circuit 32, the adaptive motion interpolation switching control circuit 33, and the motion vector correction circuit 61 of the second motion correction processing unit 60.

The average motion vector calculation circuit 32 calculates the average motion vector in an area sufficiently larger than the motion vector detection block.
Find S24 (V1). The large area can be, for example, an entire one-field image or an area obtained by dividing the one-field image vertically and horizontally into four parts. By averaging the motion vectors of the blocks belonging to the large area, the motion in the large area is calculated. Vector is getting. In the latter case, the average motion vector calculation circuit 32 outputs the average motion vector of the divided area to which the interpolated block (different from the motion vector detection block), which is the interpolation processing unit, belongs.

The average motion vector calculation circuit 32 obtains an average motion vector using a predetermined number THD or more of motion vectors whose vector size is equal to or larger than the threshold value THB. The value THB is a fixed integer value including 0, for example, and the value THD is a fixed integer value not including 0, for example. The average motion vector obtained in this way
V1 is input to the adaptive motion interpolation switching control circuit 33 and the motion vector correction circuit 51 of the first motion correction processing unit 50.

Here, the minimum level of the motion vector used for averaging is defined by the threshold value THB in order not to use a motion vector that is erroneously detected due to noise for averaging. The reason why the number to be averaged is specified using the predetermined number THD is to suppress the influence of the erroneously detected motion vector included in the average motion vector.

The motion vector correction circuit 51 corrects the input average motion vector V1 using an externally input field interpolation ratio α, and corrects the corrected motion vectors S25 (αV1) and S26.
{(1-α) V1} is a motion compensation memory corresponding to each
Give to 52,53.

The motion compensation memory 52 outputs the previous field signal S27 whose address is deviated by the motion vector αV1 corrected by the field interpolation ratio, and the other motion compensation memory 53 outputs the motion vector corrected by the field interpolation ratio ( 1-α) Output the current field signal S28 whose address is shifted by V1.

The subtraction circuit 54 includes a previous field signal S27 and a current field signal S27 that have been motion-corrected using the average motion vector V1.
The difference between the 28 pixels is obtained and given to an absolute value conversion / accumulation circuit 55. The absolute value conversion / accumulation circuit 55 converts the difference into an absolute value, accumulates the difference, and accumulates the accumulated value for each interpolation block. To the comparison circuit 34 as the first motion compensation inter-field difference signal S29.

The processing configuration in the second motion interpolation correction unit 60 is the same as the processing configuration in the first motion correction processing unit 50.

That is, the motion vector correction circuit 61 corrects the input motion vector V for each block with the externally input field interpolation ratio α, and outputs a corrected motion vector S30 (α
V) and S31 {(1−α) V} to the corresponding motion correction memories 62 and 63, respectively.

The motion correction memory 62 outputs the previous field signal S32 whose address is shifted by the motion vector αV corrected by the field interpolation ratio, and the motion correction memory 63 outputs the motion vector (1- α) Outputs the current field signal S33 whose address is shifted by V.

The subtraction circuit 64 obtains the difference between the pixels of the previous field signal S32 and the current field signal S33 subjected to the motion correction processing as described above and supplies the difference to the absolute value conversion / accumulation circuit 65. After the difference is converted to an absolute value, the difference is accumulated for each interpolation block, and is provided to the comparison circuit 34 as a second motion compensation field difference signal S34 for each interpolation block.

Here, the size of the interpolation block used for the interpolation processing is, for example, 4 pixels × 2 lines, and is selected to be smaller than the basic block size of 8 pixels × 8 lines for the motion vector detection processing. This is because if the interpolation block is large, a moving object and a background portion may be mixed in the block, and the interpolation accuracy may be reduced. On the other hand, the reason why the block size required for detecting a motion vector is increased is that when this size is reduced, it often occurs that a motion vector cannot be appropriately detected.

The comparison circuit 34 compares the magnitudes of the first and second motion compensation field difference signals S29 and S34 for each interpolation block,
For the interpolation block in which the first motion compensation inter-field difference signal S29 is small, the previous motion signal S27 and the current field signal S28 subjected to the motion compensation processing from the first motion compensation processing unit 50 are selected, and the second For the interpolation block in which the motion-compensated inter-field difference signal S34 is small, the selection control signal S35 for selecting the motion-compensated previous field signal S32 and current field signal S33 from the second motion compensation processor 60. It is provided to switch circuits 35 and 36 having a two-input one-output configuration, which are formed and operated in conjunction with each other.

The switch circuit 35 includes a motion-corrected previous field signal S27 from the first motion correction processor 50 and a motion-corrected previous field signal S32 from the second motion correction processor 60.
And the selection control signal S35 from the comparison circuit 34
, The selection operation is performed for each interpolation block. The other switch circuit 36 has the current field signal S28 subjected to motion compensation from the first motion compensation processor 50 and the second motion compensation processor 6
The current field signal S33 that has been motion-compensated from 0 is given, and similarly performs a selection operation for each interpolation block according to the selection control signal S35 from the comparison circuit.

The signals S36 and S37 selected by the respective switch circuits 35 and 36 are supplied to the corresponding multiplication circuits 37 and 38, and are weighted by the respective multiplication circuits 37 and 38 at the field interpolation ratios respectively.
S38 (α · S36) and S39 {(1−α) S37} are supplied to the adding circuit 39. Thus, the motion compensation field interpolation signal S40 interpolated by the motion is output from the addition circuit 39.

The above-described current field signal S21 and previous field signal S
22 is also provided to the subtraction circuit 40. A difference for each pixel between these field signals S21 and S22 is obtained by a subtraction circuit 40, and the difference is converted to an absolute value by an absolute value conversion / accumulation circuit 41, and then accumulated for each interpolation block. The signal is supplied to the above-described adaptive motion interpolation switching control circuit 33 as an uncorrected inter-field difference signal S41 for each insertion block.

Also, the previous field signal S22 and the current field signal S21
Is supplied to the corresponding multiplication circuits 42 and 43, and each multiplication circuit 42
The field interpolation ratio α, (1−α) is weighted by 43 and then added by the addition circuit 44 to become a linear interpolation signal (field interpolation signal without correction) S42.

The motion-compensated field interpolation signal S40 from the addition circuit 39 is given to the multiplication circuit 45, and the linear interpolation signal from the addition circuit 44.
S42 is provided to the multiplication circuit 46. The adaptive interpolation switching signals S43 (β) and S44 (1-β) are given from the adaptive motion interpolation switching control circuit 33 to the multiplication circuits 45 and 46, respectively, and the multiplication circuits 45 and 46 are input thereto. Field interpolation signal S40, S
42 is applied to the addition circuit 47 by weighting with the adaptive interpolation switching signal β, (1−β). The adder circuit 47 outputs the weighted interpolation signal S4.
5 and S46 are added to obtain the added signal as the final motion interpolation signal S4.
Output as 7.

In addition to the above-described motion vector S23 for each block, the average motion vector S24, and the uncorrected inter-field difference signal S41, the adaptive motion interpolation switching control circuit 33 also receives a signal from the comparison circuit 34 between the first and second motion correction fields. It is given which signal S48 of the smaller difference signal is the difference signal.

Based on these signals, the adaptive motion interpolation switching control circuit 33 outputs, as a motion interpolation signal, a motion compensation field interpolation signal, or a linear interpolation signal, or a weighted addition signal of both. It is determined for each interpolation block whether to output, and an adaptive interpolation switching signal S43 according to the determination result
(Β) and S44 (1−β) are multiplied by the multiplication circuit 4 as described above.
Give to 5, 46.

For example, if the uncorrected inter-field difference signal S41 is significantly smaller than the motion-corrected inter-field difference signal S48 of the selected motion correction processing unit, the output is determined to output the linear interpolation signal S42. . Conversely, if the uncorrected inter-field difference signal S41 is significantly larger than the inter-motion-compensation-field difference signal S48 according to the selected motion-compensation processing unit, the motion-compensated-field interpolation signal
It is determined to output S40. In addition, the uncorrected inter-field difference signal S41 and the motion-compensated inter-field difference signal S
When the difference from 48 is small, it is determined that both signals are weighted and added at a rate corresponding to the difference.

At the time of this determination, the magnitude of the motion vector and the average motion vector are also taken into account, and these magnitudes are compared with a threshold to determine the control content.

Therefore, according to the above-described embodiment, the motion compensation using the average motion vector can be applied by the first motion compensation processing unit 50 even in the moving image region where the conventional motion vector cannot be detected. The obtained interpolated image can be obtained.

In the above description, the present invention is applied to a television system conversion apparatus. However, the present invention is sufficiently applicable to other apparatuses that perform an interpolation process using a motion vector.

For example, the present invention can also be applied to a case where fields are thinned out on the transmission side and fields thinned out using a motion vector are reproduced on the reception side as a highly efficient coding method. In addition, among high-definition television (hi-vision) systems that have been rapidly advanced in recent years, there is a system that performs motion vector detection and motion interpolation, and the present invention can be applied to this.

In the above-described embodiment, the interpolation is performed for each interpolation block (4 pixels × 2 lines). However, the same effect can be expected by processing the interpolation for each pixel. When performing the interpolation process for each pixel, it is necessary to newly consider an interpolation error or the like due to noise.

Furthermore, although the interpolation is the field interpolation, this may be replaced with the frame interpolation.

Further, the values THB and THD defining the condition for the motion vector for performing the averaging process may be fixed values as in the embodiment, but may be changed using other parameters, for example, the number of areas of the moving image in one field as a parameter. May be.

The comparison circuit 34 determines the quality of the motion vector and the average motion vector based on the first and second motion correction field difference signals. However, if the magnitude of the motion vector is used as one of the parameters, the determination accuracy is improved. improves. For example, when the motion vector for each block is larger than the threshold value, the motion vector may be made valid, or each motion compensation field difference signal may be weighted by each vector and compared in magnitude.

Also, an area filter is provided at a stage subsequent to the comparison circuit 34,
Interpolation switching may be prevented from being performed in a single shot.

[Effects of the Invention] As described above, according to the present invention, a motion compensation field interpolation signal using a temporary motion vector (average motion vector) is appropriately used, so that the size of a moving object is Can reduce the distortion of the motion-interpolated image generated when the size is smaller than the detected block size.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a television interpolation system according to the present invention, FIGS. 2 and 3 are explanatory diagrams of a linear interpolation system, and FIG. 4 is a motion interpolation system with motion compensation. FIG. 5 is a block diagram of a conventional television signal interpolation system, and FIGS. 6 to 8 are motion vector detecting circuits 1 thereof.
FIG. 9 and FIG. 10 are explanatory diagrams of disadvantages of the conventional system. 31 ... motion vector detection circuit, 32 ... average motion vector calculation circuit, 33 ... adaptive motion interpolation switching control circuit, 34 ... comparison circuit, 35, 36 ... switch circuit, 37, 38, 42, 43, Four
5, 46: Multiplication circuit, 39, 44, 47 ... Addition circuit, 40, 5
4, 64 subtraction circuits, 41, 55, 65 absolute value conversion / accumulation circuits, 50 first motion correction processing units, 51, 61 motion vector correction circuits, 52, 53, 62, 63: memory for motion compensation, 60: second motion compensation processing unit.

Claims (1)

(57) [Claims] A digital television signal is subdivided into blocks of m pixels × n lines, a motion vector is detected between signals separated by at least one field for each block, and motion is corrected using the detected motion vector. A field (or frame) interpolation signal and an uncorrected field (or frame) interpolation signal are adaptively adjusted in an interpolation block unit or a pixel unit having a size equal to or smaller than a block size for detecting a motion vector. In addition, in the television signal interpolation method for performing switching or weight addition processing, the motion vector whose magnitude of the motion vector around the interpolation target block or the pixel to be interpolated is equal to or larger than the threshold value is averaged, and Temporary vector forming means for obtaining a temporary motion vector of the interpolated pixel; and an inter-field difference value obtained by correcting the position of the temporary motion vector. And comparing the magnitude of the inter-field difference value obtained by correcting the position corresponding to the motion vector detected for each block, and selecting a motion vector having a small difference value. And a field interpolation signal selecting means for providing a field (or frame) interpolation signal formed by using one of the motion vector or the motion vector detected for each block to a subsequent adaptive interpolation processing unit. A television signal interpolation method, which is provided.