JPH0414980A - Television signal interpolation system - Google Patents

Abstract

PURPOSE:To reduce distortion of an interpolation picture by discriminating the propriety of a tentative moving vector resulting from averaging moving vectors whose magnitude is a threshold level or over at inserted block or its surrounding and of a moving vector for each block and giving an interpolation signal formed by the excellent moving vector to the system. CONSTITUTION:A moving vector detected by a moving vector detection circuit 31 is inputted to a mean moving vector arithmetic circuit 32, an adaptive movement interpolation changeover control circuit 33 and a moving vector correction circuit 61 of a 2nd moving correction processing section 60. The mean moving vector arithmetic circuit 32 obtains a mean moving vector V1 from moving vectors whose magnitude is a prescribed threshold level or over and inputs the result to the adaptive movement interpolation changeover control circuit 33 and the moving vector correction circuit 51. Then the obtained vector is compared with a moving vector V inputted from the vector correction circuit 61 for each block at a comparator circuit 34 for each interpolation block and the result is given to the adaptive movement interpolation changeover control circuit 33. Since the moving correction using the mean moving vector is applied in this way, the interpolation picture whose picture distortion is reduced is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a television signal interpolation method involving motion correction processing using motion vectors.

[Prior Art] A technique for performing motion compensation using motion vectors is used to improve interframe coding efficiency in high-efficiency coding of television signals, and to improve motion compensation due to field number conversion in television format conversion. Used to reduce continuity.

Motion vector detection is performed by converting the television signal into m pixels x n pixels.
The detection method is subdivided into blocks of lines (m, n (i integer)), and the detection methods are the pattern matching method (Japanese Patent Laid-Open Nos. 162683-162684) and the iterative gradient method (Japanese Patent Laid-Open Nos. 162683 and 162684). 158786) is well known.

Next, as an example of interpolation processing using motion vectors, a case of converting a television system will be described.

For example, in 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 uses field memory to convert between 6 fields and 5 fields as a unit. Conversion to increase the field is performed by repeating part of the field television signal (hereinafter simply referred to as field signal), and conversion to decrease the field is performed by skipping part of the field signal.

Therefore, field discontinuity occurs at repeating or skipping points, resulting in discontinuity in the moving image. In order to correct this, generally a weighted addition (linear interpolation) process is performed on the two field signals before conversion to form a field signal after conversion.

FIG. 2 shows the linear interpolation process.

An interpolated signal cC is obtained by adding field interpolation ratios α and (1-α) to signals ca and cb separated by one field after loading. Here, the field interpolation ratio α is the pre-conversion signal ca
, cb and the converted signal cC on the time axis.

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

The shaded area in the interpolation signal PC is obtained by weighted addition of the uncorresponding background part and moving image part, and the level changes depending on the field interpolation ratio, and this part is the cause of jerkiness. It has become.

The interpolation method using motion vectors is intended to reduce the occurrence of jerkiness, and the basic idea is shown in FIG. 4, which corresponds to FIG. 3. Each pre-conversion signal PA
, PB is used to detect the motion vector of a circle that is a moving object, and a value αV obtained by multiplying this motion vector ■ by a field interpolation ratio α is used to perform motion correction on the moving object to obtain an interpolation signal PD. ing.

However, it is difficult for the detected motion vectors to accurately capture the motion of all videos, and errors may occur in some cases.In addition, in general, correction using motion vectors is performed at sub-pixel or line The following may not be done. Therefore, in interpolation processing through motion compensation using the value α■, the two signals do not overlap completely, and in practical motion interpolation processing, weights are added to the motion-compensated signal using the field interpolation ratio. It is being processed.

FIG. 5 shows the configuration of a motion interpolation unit in a conventional television format conversion device that performs motion correction on each field signal and then performs linear interpolation processing (198
9th National Conference of Television Society, Proceedings 2O-5rTV
"Motion vector detection and motion interpolation method for system conversion device" and Japanese Patent Application Laid-Open No. 1-309597).

In FIG. 5, a current field signal S1 and a previous field signal S2 are applied to a motion vector detection circuit 1. In FIG. 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 of blocks. The motion vector S3 (V) is input to the motion vector correction circuit 2 and the adaptive motion interpolation switching control circuit #i3.

The motion vector correction circuit 2 corrects the motion vector V using the field interpolation ratio α, and stores the corrected motion vectors S4 (αV) and S5 ((1-α)■) in the corresponding motion correction memory 4. .Give to 5.

Each motion correction memory 4.5 has a correction motion vector α■,
A signal S in which the coordinates of the target block of the previous field signal S2 or the current field signal S1 are shifted by (1-α)■
6. Form and output S7. The difference between these signals S6.87 is obtained for each pixel by the subtraction circuit 6, and this difference is converted into an absolute value by the absolute value conversion accumulation circuit 7, and then accumulated for each interpolation block. is applied to the above-mentioned adaptive motion interpolation switching control circuit 3 as a motion-corrected inter-field difference signal S8.

Further, the output signals S6 and S7 from each memory 4.5 are given to the corresponding multiplication circuit 8.9, and after being loaded with the field interpolation ratio α, (1-α) by each multiplication circuit 8.9,
The signals are added by the adding circuit 10 to obtain S motion correction field interpolation signals.

This motion correction field interpolation signal S9 is applied to a multiplication circuit 11.

The current field signal S1 and the previous field signal S2 are also applied to the subtraction circuit 12. A pixel-by-pixel difference between these field signals S1 and 82 is obtained by subtraction diagram #112, and this difference is converted into an absolute value by an absolute value conversion/accumulation circuit 13, and then accumulated for each interpolation block to perform interpolation. The uncorrected interfield difference signal S10 for each block is applied to the adaptive motion interpolation switching control circuit 3 described above.

In addition, the previous field signal S2 and the current field signal S1
is given to the corresponding multiplication diagram #114.15, and each multiplication circuit 14.15 calculates the field interpolation ratio α, (1-α)
After being loaded, the signals are added in an addition cycle of 1.416 yen to form a linear interpolation signal Sll.

This linear interpolation signal Sll is given to a multiplication circuit 17.

The adaptive motion interpolation switching control circuit 3 outputs, as a motion interpolation signal,
Motion correction field interpolation signal S9 or linear interpolation signal Sl
This is a circuit that determines whether to output the signal l or the weighted addition signal of both, using the magnitude of the motion vector ■, the motion-corrected inter-field difference signal S8, and the uncorrected inter-field difference signal S10 as parameters. , adaptive interpolation switching signals 512 (β), 313 (1
-β) to the corresponding multiplication circuit 11.17.

Thus, the multiplication circuit 11 outputs a signal obtained by multiplying the motion compensation field interpolation signal S9 by 8, and the multiplication circuit 17 outputs a signal obtained by multiplying the linear interpolation signal Sll by (1-β).
These signals are added in the adder circuit 18 to form the final motion interpolation signal S12.

Next, the details of the motion vector detection circuit 1 will be explained in detail since they are also related to the problems of the prior art.

The block size for detecting motion vectors is based on 8 pixels x 8 lines as shown in Figure 6, and the block size for selecting the initial deviation vector and calculating the iterative gradient method, which will be described later, is larger than that. 20 pixels x 16 lines (
However, the target is 800 pixels (every other pixel and every other line).

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 applied to corresponding two-dimensional low-pass filters 20.21 to remove noise components and reduce high-frequency components. The filtered combined signal of the current field signal and the previous field signal is sent to the initial deviation vector selection circuit 22, the first
Gradient method calculation circuit fI@23 and second gradient calculation circuit 2
4 and stored in the built-in memory of each circuit.

The initial deviation vector selection circuit 22 selects an initial deviation vector from detected motion vectors stored in the motion vector memory 25 or 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, a block A vertically adjacent to the detected block,
Block B is one block ahead of block A in the horizontal direction.
Then, the motion vector of block C two blocks before the detected block is set as a candidate vector. In addition, regarding one field before, the motion vector of block N that has advanced by one block in the vertical and horizontal directions from block J at the position corresponding to the detected block, and the average motion vector of blocks F to N centered on block J. is considered a candidate vector. Furthermore, the 9th block F~ of the previous field
The candidate vector is a vector (acceleration vector) obtained by subtracting the average motion vector of blocks P to X, centered on block T of the field before the previous field corresponding to the detected block, from twice the average motion vector of N.

The initial deviation vector selection circuit HI22, for example, shifts the previous field signal by the amount of the candidate vector, calculates the pixel difference value between the blocks of both fields, and further calculates the total absolute value of the difference values. This calculation is performed on all candidate vectors, and the candidate vector with the smallest cumulative absolute value is set as the initial deviation vector.

The first gradient calculation circuit 23 performs the following (1) on 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 deviation vector (■0).
2~ Perform the calculation of equation (4) to obtain the vector vp (Vxp, Vyp) by applying the gradient method once.

V Xp=ΣSGNΔX −DFD/Σ)ΔXI
−(1) vyp=ΣSGNΔY, DFD/Σ1ΔY
1...(2)ΔX= (An+1.m -An-
1, m)/2 ==-(3)ΔY= (An, I
Il+1-An, m-1)/2 =-=(4,)
(However, An, m is the signal at the coordinates of the n-th pixel of the m line,
The initial deviation vector VO and the vector Vp obtained by applying the gradient method once are added at the adding port 2826 and the second vector is added. is applied to the gradient calculation circuit 24 and the addition port 827.

The second gradient calculation circuit 24 has an input vector ■o +v
Using p, the same calculation as in the first gradient calculation circuit 23 is performed, and the obtained vector Vq is provided to the addition circuit 27. In this way, the motion vector V (VO+Vp +VQ) of the detected block is obtained by the adder circuit 27, which is output and also given to the motion vector memory 25.

[Problems to be Solved by the Invention] By the way, in a motion vector detection method using an iterative gradient method, in order to improve motion vector detection accuracy, it is better to have a large detection block size, but if the block size is increased, It is known that detection sensitivity deteriorates.

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

For ordinary television images, this block size poses almost no problem. However, for signals from computer graphics and signals from CCD television cameras with high-speed shutters, problems arise because there is less filtering in the time direction, so the moving images are clear and the field correlation is small. 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 a motion vector. If the still image level of the background is flat, it is still possible to detect a motion vector, but if the still image level of the background is not flat, the motion vector will be a background still image with a large area ratio, so the motion vector will be 0. becomes.

If the moving object is small compared to the overall image, this movement distortion is not visually noticeable. However, from Fig. 9<A) to (B
), when a thin vertical line moves at speed V from the background area BA where the still image level is flat to the background area BB where the still image level is not flat, the motion vector of the vertical line part with area BA as the background is V, whereas the motion vector of the vertical line with area BB as the background is 0. Therefore, the motion interpolated image is an image corrected with motion vector V in area BA, and 0 in area BB. Therefore, it becomes a linear interpolated image,
Image distortion as shown in FIG. 10 occurs.

The present invention has been made in consideration of the above points, and can reduce the distortion of interpolated images that occurs when the size of a moving object is small compared to the detection block size of a motion vector. The present invention attempts to provide a television signal interpolation method.

"Means for Solving the Problems" In order to solve the problems, the present invention subdivides a digitized television signal into blocks of m pixels x n lines, and in each block, moves between signals separated by one field or more. a field (or frame) interpolation signal that detects a vector and performs motion compensation using the detected motion vector;
a field (or frame) interpolation signal without correction,
In a television signal interpolation method that adaptively performs switching or weight addition processing in units of interpolation blocks or pixels whose size is less than or equal to the block size for detecting motion vectors, the following means are newly added. It was established in

That is, the motion vectors around the block to be interpolated or the pixel to be interpolated whose magnitude is greater than or equal to a threshold are averaged,
Temporary vector forming means for obtaining a temporary motion vector of this interpolated block or interpolated pixel, and a judgment of the quality of this temporary motion vector and the motion vector detected for each block.
A determination means based on both motion correction results and a field (or frame) interpolation signal formed using a temporary motion vector determined to be good or a motion vector detected for each block are used for subsequent adaptation. A field interpolation signal selection means to be applied to the interpolation processing section is provided.

[Operation] In the television signal interpolation method using motion vectors, the present invention detects motion vectors for each block. Therefore, motion vector detection becomes impossible for moving objects whose area is small compared to the block size. As a method to reduce the distortion caused in the motion interpolated image, the average value of the motion vectors around the moving image for which no motion vector can be detected is temporarily set as the motion vector of this moving image, and this temporary motion Image distortion is reduced by performing motion correction using vectors.

That is, the provisional vector forming means averages motion vectors around the interpolated block or interpolated pixel whose magnitude is equal to or greater than a threshold value, and generates a provisional motion vector of this interpolated block or interpolated pixel. obtained and given to the judgment means. The determining means determines the quality of the temporary motion vector and the motion vector detected for each block by the motion vector detection circuit based on the motion correction results of both. The field interpolation signal selection means supplies a field (or frame) interpolation signal formed using the temporary motion vector determined to be good or the detected motion vector for each block to the subsequent adaptive interpolation processing section.

[Example] Hereinafter, an example 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 applied to a motion vector detection circuit 31. The motion vector detection circuit 31 uses these current field signal S21 and previous field signal S22 to detect a motion vector for each block obtained by dividing one field into predetermined sizes.

Detection of a motion vector is performed, for example, by selecting an initial displacement vector, which is similar to the conventional method, and then applying iterative gradient calculation twice. The detected motion vector 823 (
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 section 60.

The average motion vector calculation circuit 32 calculates the average motion vector S24 (Vl) in an area sufficiently larger than the motion vector detection block. This large area can be, for example, the entire one-field image or each area obtained by dividing one field image into four vertically and horizontally, and by averaging the motion vectors of the blocks belonging to this large area, the motion in the large area can be calculated. We are getting a vector. 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 unit of interpolation processing, belongs.

The average motion vector calculation circuit 32 calculates an average motion vector using a predetermined number THD or more of motion vectors whose vector size is equal to or greater than a threshold value THB. Note that the value THB is, for example, a fixed integer value that includes 0, and the value THD is, for example, a fixed integer value that does not include 0.

The average motion vector (1) obtained in this way is applied to the adaptive motion interpolation switching control circuit 33 and the first motion correction processing section 5.
0 to the motion vector correction circuit 51.

The reason why the minimum level of motion vectors used for averaging is defined by the threshold value THB is to prevent motion vectors that are erroneously detected due to noise from being used for averaging. Furthermore, the reason why the number to be subjected to averaging is defined using a predetermined number THD is to suppress the influence of erroneously detected motion vectors included in the average motion vector.

The motion vector correction circuit 51 corrects the input average motion vector V1 using the field interpolation ratio α input from the outside to obtain a corrected motion vector 525 (αVl) and S26 < (1-α)Vl). The data are applied to the corresponding motion correction memories 52 and 53, respectively.

The motion compensation memory 52 outputs the previous field signal 827 whose address is shifted by the motion vector α■1 corrected by the field interpolation ratio, and the other motion compensation memory 53
Motion vector (1-α) corrected by field interpolation ratio
A current field signal S28 whose address is shifted by Vl is output.

The subtraction circuit B54 obtains the difference between pixels of the previous field signal 827 and the current field signal 828, which have been subjected to motion correction processing using the average motion vector V1, and supplies it to the absolute value conversion/accumulation circuit 55, which performs absolute value conversion/accumulation. The calculator 855 converts the difference into an absolute value, then accumulates it, and provides the cumulative value to the comparison circuit F#i34 as the first motion-corrected inter-field difference signal S29 for each interpolation block.

The processing configuration in the second motion interpolation correction section 60 is similar to the processing configuration in the first motion correction processing section 50.

That is, the motion vector correction circuit 61 corrects the input motion vector 530 (α
(2) and 531f (1-α>■) are applied 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 previous field signal S32 whose address is shifted by the motion vector αV corrected by the field interpolation ratio. α) Outputs the current field signal 833 with the address shifted by ■.

The subtraction circuit 64 obtains the difference between the pixels of the previous field signal S32 and the current field signal 333 that have been subjected to the motion correction process and supplies it to the absolute value conversion/accumulation circuit 65. After converting the difference into an absolute value, the difference is accumulated for each interpolation block and provided to the comparison circuit 34 as a second motion-corrected inter-field difference signal S34 for each interpolation block.

Here, the size of the interpolation block used for interpolation processing is, for example, 4 pixels x 2 lines, which is selected to be smaller than the basic block size of 8 pixels x 8 lines for motion vector detection processing. This is because if the interpolation block is made large, the moving object and the background portion may coexist in the block, which may reduce the interpolation accuracy.

On the other hand, the reason why the block size for motion vector detection is increased is that if this size is made smaller, motion vectors may not be detected appropriately in many cases.

Comparison time B34 compares the magnitudes of the first and second motion-corrected inter-field difference signals S29 and S34 for each interpolation block. , first motion correction processing section 5
The previous field signal S27 and the current field signal 328 subjected to motion correction processing from 0 are selected, and for interpolation blocks where the second motion correction inter-field difference signal S34 is small, the second motion correction processing unit 60 Previous field signal S32 and current field signal 3 subjected to motion correction processing
A selection control signal S35 for selecting 33 is generated and applied to switch circuits 35 and 36 having a two-man power and one output configuration, which perform switching operations in conjunction with each other.

The switch circuit 35 is supplied with a motion-corrected previous field signal S27 from the first motion correction processing section 50 and a motion-corrected previous field signal S32 from the second motion correction processing section 60, and performs a comparison. A selection operation is performed for each interpolation block in response to a selection control signal S35 from the circuit 34.

The other switch circuit 36 includes a first motion correction processing section 5.
A motion-compensated current field signal S28 from 0 and a motion-compensated current field signal 833 from the second motion compensation processing section 60 are given, and similarly, the comparison port Fr4
A selection operation is performed for each interpolation block in response to a selection control signal S35 from 34.

Signals 836, S selected by each switch circuit 35.36
37 is given to the corresponding multiplier circuit 37.38, and each multiplier circuit 37.38 loads it with the field interpolation ratio, and the weight signal 338 (α・536), S39 ((
1-α) S37) is applied to the adder circuit 39. In this way, a motion correction field interpolation signal S40 subjected to motion interpolation is output from the three adder circuits.

The above-mentioned current field signal 821 and previous field signal S22 are also applied to the subtraction circuit 40.

A pixel-by-pixel difference between these field signals S21 and 822 is obtained by a subtraction circuit 40, and this difference is converted into an absolute value by an absolute value conversion/accumulation circuit 41, and then accumulated for each burial block to perform interpolation. The uncorrected interfield difference signal S41 for each block is applied to the adaptive motion interpolation switching control circuit 33 described above.

In addition, the previous field signal S22 and the current field signal S
21 is given to the corresponding multiplier circuit 42.43, and each multiplier circuit 42.43 calculates the field interpolation ratio α, (1-α
) are loaded, and then added by the addition circuit 44 to produce a linear interpolation signal (uncorrected field interpolation signal) S42
becomes.

Motion correction field interpolation signal S40 from addition circuit 39
is applied to the multiplication circuit 45, and the linear interpolation signal S42 from the addition circuit 44 is applied to the multiplication circuit 46. Each multiplication time &
J45.46 respectively have an adaptive motion interpolation switching control diagram n
33 to adaptive interpolation switching signal 843 (β>-844(1-
β) is given, and each multiplier circuit 45, 46 loads the input field interpolation signal S40, 342 with an adaptive interpolation switching signal β, (1-β) and supplies it to the adder circuit 47.

Addition circuit 47 receives both weighted interpolation signals S45 and S4.
6 is added and the added signal is output as the final motion interpolation signal S47.

The adaptive motion interpolation switching control circuit 33 receives, in addition to the above-described motion vector 323 for each block, average motion vector S24, and uncorrected interfield difference signal S41, a signal between the first and second motion compensation fields from the comparison circuit 34. The smaller of the difference signals, S48, is given after making it clear which difference signal it is.

Based on these signals, the adaptive motion interpolation switching control circuit 33 outputs a motion correction field interpolation signal, a linear interpolation signal, or a weighted addition signal of both as a motion interpolation signal. The adaptive interpolation switching signal 543 is determined based on the determination result for each interpolation block.
(β), 544 (1-β) are applied to the multiplication circuits 45 and 46 as described above.

For example, if the uncorrected inter-field difference signal S41 is significantly smaller than the motion-corrected inter-field difference signal 848 associated with the motion correction processing section whose output has been selected, it is determined to output the linear interpolation signal 842. . Conversely, the uncorrected inter-field difference signal S41 is the motion-corrected inter-field difference signal S related to the motion correction processing unit whose output is selected.
If it is significantly larger than 48, it is determined to output the motion correction field interpolation signal S40. Furthermore, if the difference between the uncorrected inter-field difference signal S41 and the motion-corrected inter-field difference signal S48 is small, it is determined that both signals are to be weighted and added at a rate corresponding to the difference.

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

Therefore, according to the above-described embodiment, the first motion correction processing unit 50 can apply motion correction using the average motion vector even in a moving image area where conventional motion vector detection is impossible, thereby reducing image distortion. An interpolated image can be obtained.

Although the above description describes the application to a television format conversion device, it is also fully applicable to other devices that perform interpolation processing using motion vectors.

For example, as a high-efficiency encoding method, the present invention can be applied to cases in which fields are thinned out on the transmitting side and the thinned out fields are reproduced using motion vectors on the receiving side. Furthermore, among the high-definition television (high-definition) systems that have been rapidly progressing in recent years, there is a system that performs motion vector detection and motion interpolation, and the present invention can also be applied to this system.

Further, in the above embodiment, interpolation is performed for each interpolation block (4 pixels x 2 lines), but the same effect can be expected even if this is performed for each pixel. When performing interpolation processing, it is necessary to newly consider interpolation errors caused by noise.

Furthermore, although field interpolation is used as the interpolation, it may be replaced with frame interpolation.

The values THB and THD that define the conditions for motion vectors to be averaged may be fixed values as in the embodiment, but they can be changed using other parameters, such as the number of moving image areas in one field. You may do so.

Comparison B34 judges whether the motion vector and the average motion vector I are good or bad based on the difference signal between the first and second motion compensation fields, but if the size of the motion vector is used as one of the parameters, Judgment accuracy improves.

For example, if the motion vector for each block is larger than a threshold value, it may be validated, or each motion correction field difference signal may be weighted by each vector and compared in size.

In addition, an area filter is provided after the comparison circuit 34,
It may be possible to prevent interpolation switching from being performed singly.

[Effects of the Invention] As described above, according to the present invention, a motion correction field interpolation signal using a temporary motion vector (average motion vector) is appropriately used. It is possible to reduce the distortion of the motion interpolated image that occurs when the detection block size is small compared to the detection block size.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the television interpolation method according to the present invention, FIGS. 2 and 3 are explanatory diagrams of the linear interpolation method, and FIG. 4 is a motion interpolation method with motion compensation. FIG. 5 is a block diagram of the conventional television signal interpolation method, and FIGS. 6 to 8 are the motion vector detection circuit 1.
FIGS. 9 and 10 are explanatory diagrams of the drawbacks 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. 38.42.43.45.46...Multiplication circuit, 39.44.47...Addition circuit, 40.54.6
4... Subtraction circuit, 41.55.65... Absolute value conversion/accumulation circuit, 50... First motion correction processing section, 51.
61...Motion vector correction circuit, 52.53.62.
63...Motion correction memory, 60...Second motion correction processing unit. Figure 2: Illustration of linear interpolation processing Figure 3: Illustration of interpolation with motion compensation Figure 4: Illustration of interpolation with motion compensation

Claims (1)

[Claims] Digitized television signals are subdivided into blocks of m pixels x n lines, motion vectors are detected between signals separated by one field or more for each block, and motion correction is performed using the detected motion vectors. field (or frame)
The interpolation signal and the uncorrected field (or frame) interpolation signal are adaptively switched or loaded in units of interpolation blocks or in units of pixels whose size is less than or equal to the block size for detecting motion vectors. In a television signal interpolation method that performs addition processing, motion vectors around a block to be interpolated or a pixel to be interpolated whose size is larger than a threshold are averaged, and a hypothetical value for this block or pixel to be interpolated is calculated. a provisional vector forming means for obtaining a motion vector; a determination means for determining whether the provisional motion vector and the motion vector detected for each block are good or bad based on the motion correction results of both; A field formed using the motion vector of or the motion vector detected for each block (
or frame) interpolation signal to a subsequent adaptive interpolation processing section.