JP3601506B2 - Apparatus and method for detecting motion vector, and apparatus and method for correcting image vibration - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a motion vector detecting device and method, and an image vibration correcting device and method, and detects and corrects a moving amount of an image due to a so-called camera shake included in video data such as an imaging output of a handy type video camera. The present invention is applied to an image stabilization device for a moving image.
[0002]
[Prior art]
In general, in a handy type video camera, camera shake during shooting, that is, camera vibration appears as image vibration. Therefore, as an image stabilization device for correcting image vibration caused by such a camera shake, for example, as disclosed in Japanese Patent Application Laid-Open No. 63-166370, a motion vector of an image is detected and based on this motion vector. A technique for correcting video data stored in an image memory has been proposed.
[0003]
For example, a block matching method is employed for detecting a motion vector of an image. In the detection of a motion vector of an image by the block matching method, a screen is divided into a number of regions (referred to as blocks), and a representative point pixel of a previous field located at the center of each block and a pixel of each pixel in a block of the current field are determined. The absolute value of the field difference from the image data is calculated, the absolute value of the field difference of each block is integrated for each corresponding pixel to obtain a correlation integral value, and the correlation integration having coordinates corresponding to the pixel array of one block Form a value table. Then, the motion vector of the entire screen is determined using the coordinate value of the minimum value of the correlation integral value in the correlation integrated value table as the coordinate value of the motion vector of the image.
[0004]
In general, in the above-described block matching method, a motion vector of an image due to camera shake and a motion vector due to a motion of a subject are simultaneously generated, so that it is difficult to determine these. 2. Description of the Related Art Conventionally, as a method for improving the accuracy of detecting a motion vector of an image due to camera shake, one screen is divided into a plurality of regions (macroblocks), and motion vectors (macrovectors) for each macroblock are obtained. Techniques for determining vectors are known. For example, as shown in FIG. 13, (2, 0) is determined as a motion vector of the entire screen by a majority decision on macro vectors obtained by dividing one screen into 4 × 3 macroblocks. The effect of the motion vector was removed.
[0005]
[Problems to be solved by the invention]
By the way, in the method of detecting a motion vector by obtaining a minimum value of a correlation integrated value table in a macroblock unit and detecting a motion vector of the entire screen from the motion vector of each macroblock, if there is a moving object, a camera shake vector Since the background image including the information of the moving object is masked by the moving object, the larger the proportion of the moving object in the image is, the lower the rate at which the camera shake vector is detected as the motion vector in the macroblock unit is, and the correct camera shake is. There is a problem that it is difficult to detect the vector.
[0006]
Accordingly, the present applicant divides one screen into a plurality of macroblocks in such a manner that macroblocks that are not adjacent to each other are generated, and detects a motion vector by obtaining a minimum value of a correlation integrated value table for each macroblock. As shown in FIG. 14, a method of using the same motion vector (independent same vector) detected in at least two macroblocks located at spatially separated positions as a camera shake vector is disclosed in, for example, Japanese Patent Application No. 3-100384. And so on. FIG. 14 shows an example of a motion vector of each macroblock and a (macrovector) generation pattern thereof.
[0007]
However, for example, as shown in a macro vector in FIG. 15, when a large moving object screen is entered, the motion vector (−3, 0) based on the moving object can be obtained by the above-described majority decision or the independent identical vector method. And the camera shake vector (1, -2) may not be able to be determined.
[0008]
Accordingly, the present invention has been made in view of such circumstances, and aims to enable high-performance camera shake correction in a handy-type video camera or the like, and even when a moving object is present in an image. An object of the present invention is to provide a motion vector detecting device and method capable of detecting a motion vector with high accuracy, and an image vibration correcting device and method.
[0009]
[Means for Solving the Problems]
A motion vector detecting apparatus according to the present invention divides one screen into a plurality of macro blocks in such a manner that macro blocks that are not adjacent to each other are generated, and macro vector detecting means for detecting a motion vector for each macro block. When substantially the same motion vector is detected by the macro vector detection means in at least two non-adjacent macro blocks, the macro block is set as an effective macro block, and a motion vector of the entire screen is detected based on the effective macro block. Motion vector detection means, storage means for storing position information of the effective macroblock, and position of a macroblock having the same motion vector on the current screen when the motion vector of the entire screen is not detected by the motion vector detection means. Information and Is based on the time correlation between the position information of the effective macro block of the previous screen is characterized by comprising a determination means for outputting the entire screen of the motion vector of the current screen.
[0010]
In addition, the motion vector detecting method according to the present invention includes a step of dividing one screen into a plurality of macroblocks and detecting a motion vector for each macroblock in such a manner that macroblocks not adjacent to each other occur. Detecting substantially the same motion vector in at least two of the macroblocks, determining the macroblock as an effective macroblock, and detecting a motion vector of the entire screen based on the effective macroblock; Storing the position information of the macro block having the same motion vector of the current screen when the motion vector of the entire screen is not detected, and the position information of the effective macro block of the previous screen to be stored. Of the current screen based on the time correlation of Characterized in that it comprises a step of outputting the torque.
[0011]
In addition, the image vibration correction apparatus according to the present invention divides one screen into a plurality of macroblocks in such a manner that macroblocks that are not adjacent to each other occur, and detects a motion vector for each macroblock. And when substantially the same motion vector is detected by the macro vector detecting means in at least two macro blocks that are not adjacent to each other, the macro block is regarded as an effective macro block, and the motion vector of the entire screen is determined based on the effective macro block. , A storage unit for storing the position information of the effective macroblock, and a macro having the same motion vector of the current screen when the motion vector of the entire screen is not detected by the motion vector detection means. Block position information and the storage means A determination unit that outputs a motion vector of the entire screen of the current screen based on the time correlation with the position information of the effective macroblock of the previous screen to be stored, and a motion vector of the entire screen output from the determination unit based on the motion vector. And a correcting means for correcting the vibration of the image forming the screen.
[0012]
Further, in the image vibration correction method according to the present invention, a screen is divided into a plurality of macroblocks in such a manner that macroblocks not adjacent to each other are generated, and a motion vector is detected for each macroblock. Detecting substantially the same motion vector in at least two non-adjacent macroblocks as a valid macroblock and detecting a motion vector of the entire screen based on the valid macroblock; Storing the position information of the block, and when the motion vector of the entire screen is not detected, the position information of the macro block having the same motion vector of the current screen and the position information of the effective macro block of the previous screen to be stored. Based on the time correlation with the And outputting the torque, based on the motion vector of the entire screen to be the output, characterized in that it comprises a step of correcting the vibration of the image constituting the screen.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0014]
An apparatus for detecting a motion vector of an image according to the present invention is configured, for example, as shown in FIG.
[0015]
The motion vector detecting device 10 shown in FIG. 1 is a device in which the present invention is applied to a vibration correcting device that corrects image vibration due to camera shake in a handy type video camera, and includes a correction signal generating unit 20 and a correcting unit 30. It constitutes a vibration correction device. In FIG. 1, a signal input terminal 1 is supplied with input video data obtained by digitizing a video signal obtained as an imaging output by an imaging unit (not shown) of the video camera.
[0016]
The motion vector detection device 10 includes a field difference detection unit 11 to which input video data is supplied through the signal input terminal 1, a macro vector detection unit 12 to which an output of the field difference detection unit 11 is supplied, An independent / quasi-independent identical vector determining unit 15 to which the output of the macro vector detecting unit 12 is supplied; and a camera shake vector determining unit 16 to which the outputs of the macro vector detecting unit 12 and the independent / quasi-independent identical vector determining unit 15 are supplied. Is provided.
[0017]
The field difference detection unit 11 includes a representative point memory 11A to which the input video data is supplied via the signal input terminal 1, and a subtraction circuit 11B.
[0018]
The representative point memory 11A stores image data Ik (0,0) of representative point pixels for each block obtained by dividing an image of one field composed of input video data into a plurality of blocks. Specifically, for example, as shown in FIG. 2, a screen of one field is divided into blocks of m pixels × n lines, and as shown in FIG. 3, a pixel S (0,0) at the center of each block is set as a representative point. The image data Ik (0,0) of each representative point pixel is stored in the representative point memory 11A for one field period. Note that the representative points are uniformly distributed on the screen. Then, the image data Ik-1 (0,0) of each representative point pixel one field before, which is read from the representative point memory 11A, is supplied to the subtraction circuit 11B.
[0019]
Further, the subtraction circuit 11B converts the image data Ik (x, y) of m × n pixels in each block into the input video data supplied through the signal input terminal 1, that is, the image data of the current field. Absolute value | Ik-1 (0,0) -Ik of the difference between the image data Ik-1 (0,0) of the representative point pixel of the block corresponding to the previous field read from the representative point memory 11A, that is, the difference between the fields. (X, y) |.
[0020]
Then, the field difference detection unit 11 supplies the macro vector detection unit 12 with the field difference absolute value | Ik-1 (0,0) -Ik (x, y) | obtained by the subtraction circuit 11B.
[0021]
The macro vector detection unit 12 includes a macro block generation circuit 13 to which the field difference absolute value | Ik-1 (0,0) -Ik (x, y) | obtained by the field difference detection unit 11 is supplied. First to twelfth macro vector detection circuits 14A to 14L to which the field difference absolute value | Ik-1 (0,0) -Ik (x, y) | And a vector detection circuit 14M.
[0022]
The macroblocking circuit 13 generates macroblocks that are not adjacent to each other with respect to the field difference absolute value | Ik-1 (0,0) -Ik (x, y) | obtained by the field difference detection unit 11. One screen is divided into a plurality of macro blocks. For example, as shown in FIG. 4, one screen is divided into 4 × 3 12 macro blocks B1 to B12.
[0023]
The field difference absolute value | Ik-1 (0,0) -Ik (x, y) | which has been macroblocked by the macroblocking circuit 13 is a macro vector detection circuit corresponding to each of the macroblocks B1 to B12. 14A to 14L are supplied for each macroblock, and all the macroblocks are supplied to the vector detection circuit 14M.
[0024]
The first macro vector detection circuit 14A is configured by the m × n pixels for the field difference absolute value | Ik−1 (0,0) −Ik (x, y) | of the first macro block B1. The absolute value of each field difference of the block to be processed is integrated for each corresponding pixel to form a correlation integrated value table of the first macroblock B1, and the minimum value coordinates are detected as motion vector candidates. Similarly, the second to twelfth absolute value integrators 14B to 14L form a correlation integrated value table of the corresponding second to twelfth macroblocks B2 to B12, and convert each minimum value coordinate to a motion vector. Detect as a candidate. Further, the thirteenth absolute value integration circuit 14M forms a correlation integrated value table of the entire one screen including the first to twelfth macroblocks B1 to B12, and detects the minimum value coordinates as motion vector candidates. .
[0025]
Here, the correlation integrated value of each correlation integrated value table formed by the macro vector detection unit 12 is represented by image data Ik-1 (0, 0) of a representative point pixel of each block and image data Ik (Ik) of another pixel. x, y), and indicates a smaller value for a coordinate corresponding to a pixel having a strong correlation, and a minimum value of a correlation integrated value of a coordinate corresponding to a motion vector. The motion vector can be detected by detecting the coordinates of the value. Note that the minimum value of the correlation integrated value table is one of the minimum values, and when the proportion of the moving object in the image is large, for example, as shown in FIG. The vector is detected as the minimum value coordinate (3, 1) in the correlation integrated value table, and the ratio of the background vector, that is, the camera shake vector, detected as the coordinate indicating the motion vector in the macroblock unit decreases. This is detected as the coordinates (-1, 0) of the minimum value in the correlation integrated value table.
[0026]
That is, in this embodiment, the field difference detection unit 11 and the macro vector detection unit 12 divide one screen into a plurality of macroblocks in such a manner that macroblocks that are not adjacent to each other are generated. It detects a motion vector and functions as a macro vector detecting means in the image motion vector detecting device according to the present invention.
[0027]
Then, the macro vector detection unit 12 detects the motion vectors of the macro blocks B1 to B12 detected by the first to twelfth macro vector detection circuits 14A to 14L, that is, the macro vectors and the ones detected by the vector detection circuit 14M. The motion vector of the entire screen is supplied to the independent / quasi-independent identical vector determination unit 15 and the camera shake vector determination unit 16.
[0028]
The independent / quasi-independent identical vector determination unit 15 determines the occurrence pattern of the same motion vector for each macro vector supplied from the macro vector detection unit 12 and the motion vector of the entire screen, and is spatially separated. When the same motion vector (independent same vector) is detected in at least two macroblocks at the position, the motion vector is output as a motion vector candidate for the entire screen. For example, in the state shown in FIG. 5, the same motion vector (-1, 0) is present in the two macroblocks B1, 4 at spatially separated positions. Is the camera shake vector. As described above, the independent / quasi-independent identical vector determination unit 15 sets not only the minimum value vector of the integrated value of each macroblock but also the minimum value vector as a motion vector candidate, so that the moving object occupies the screen. Even when the ratio is very large, the probability that a correct motion vector can be detected increases, and the influence of a moving object can be reduced, and a motion vector with a small error can be obtained.
[0029]
The independent / quasi-independent identical vector determination unit 15 determines the same motion vector generation pattern for each macro vector supplied from the macro vector detection unit 12 and the motion vector of the entire screen, and the same as in FIG. As shown in an example of a macro vector generation pattern, when substantially the same motion vector (quasi-independent same vector) is detected in each macro block arranged in a concave shape, the motion vector is used as a motion vector candidate for the entire screen. Output.
[0030]
Here, a moving object such as a car or a person present on the screen often appears in a convex shape, so that when substantially the same motion vector is detected in each of the macroblocks arranged in a concave shape as described above, By using the motion vector as a motion vector candidate for the entire screen, the independent / quasi-independent identical vector determination unit 15 can reliably detect the motion vector.
[0031]
The camera shake vector determination unit 16 functions as a camera shake vector determination unit in the image motion vector detection device according to the present invention, and includes an overlap degree calculation circuit 16A and a macroblock validity determination memory 16B.
[0032]
When the motion vector is detected by the independent / quasi-independent identical vector determination unit 15 in the camera shake vector determination unit 16, the overlap degree calculation circuit 16 </ b> A outputs the motion vector as it is. In addition, the overlapping degree calculation circuit 16A stores information indicating each macro block in which the same macro vector as the motion vector output for each field is obtained in the macro block validity determination memory 16B as valid macro block information.
[0033]
For example, assuming that a macro vector as shown in FIG. 7 is obtained in the previous field and a motion vector (-1, 2) is detected, the motion vector (-1, 2, 3) is stored in the macro block validity determination memory 16B. 8) obtained by obtaining the same macro vector as that shown in FIG. 8 are stored in the macroblock validity determination memory 16B as valid macroblock information, indicating macroblocks B1, B4, B5, and B9.
[0034]
Further, when the independent / quasi-independent identical vector determination unit 15 cannot detect a motion vector, the overlap degree calculation circuit 16A reads out valid macroblock information one field before from the macroblock validity determination memory 16B, and The time correlation of each macro vector of the current field supplied from the macro vector detection unit 12 is determined, and the motion vector of the macro block whose time correlation is determined to be significant is output as the motion vector of the entire screen.
[0035]
For example, if a macro vector as shown in FIG. 9 is obtained in the current field, there is no independent identical vector and no prepared independent identical vector, so that the independent / quasi-independent identical vector determination unit 15 cannot detect a motion vector. Here, the number of detected (7, 0) macro vectors indicating the motion vector due to the moving object is 9, and the (-4, 1) macro vector indicating the background vector (camera shake vector) is detected. Since the number is three, the motion vector is simply determined to be (7, 0) by majority decision.
[0036]
Therefore, assuming that (7, 0) is a motion vector in the current field, the overlapping degree calculating circuit 16A determines that the current field is valid in the previous field indicated by the valid macroblock information of the previous field read from the macroblock validity determination memory 16B. Of the four macroblocks B1, B4, B5, and B9, only one of the macroblocks B4 is (7, 0), so that -3 + 1 = -2 points are counted. Also, of the nine B2 to B4, B6 to B8, and B10 to B12 hatched in FIG. 10 in which the (7, 0) macro vector is obtained in the current field, of the macroblock B4 in the previous field. Since only one is a valid macro block, it is counted as -8 + 1 = -7 points. Then, the evaluation points when (7, 0) are motion vectors in the current field are counted as −2−7 = −9 points.
[0037]
If the current field is (-4, -1) as a motion vector, the overlap degree calculating circuit 16A calculates the previous field indicated by the valid macroblock information of the previous field read from the macroblock validity determination memory 16B. Of the four macroblocks B1, B4, B5, and B9 that were effective in step (3), three of the macroblocks B1, B5, and B9 are (-4, -1), so that 3-1 = 2 points. I do. In addition, since the three macroblocks B1, B5, and B9 indicated by hatching in FIG. 11 in which the (-4, -1) macrovector is obtained in the current field are all valid macroblocks in the previous field, 3-0 = count 3 points. Then, the evaluation points when (-4, -1) are motion vectors in the current field are counted as 2 + 3 = 5 points.
[0038]
The above-described overlap degree calculating circuit 16A estimates that the evaluation point is −9 when (7, 0) is a motion vector in the current field, but the (−4, −1) is the motion vector in the current field. Since there are five evaluation points in the case of, it can be determined that the above (-4, -1) is a motion vector.
[0039]
As described above, in the motion vector detection device of this embodiment, the screen is divided into a plurality of macroblocks by the field difference detection unit 11 and the macro vector detection unit 12 in such a manner that macroblocks that are not adjacent to each other are generated. , A motion vector is detected for each macroblock. Then, the camera shake vector determination unit 16 determines the time correlation of the motion vector of each macroblock obtained by the macro vector detection unit 12, and determines the motion of the macroblock for which the time correlation having the time correlation is determined to be significant. Since the vector is output as a motion vector of the entire screen, i.e., a camera shake vector, a camera shake vector in a case of entering a large moving object screen that cannot be determined by a method using the same independent vector or the preparation independent same vector or a simple majority decision. Can be reliably detected and output.
[0040]
The method of determining the time correlation of each macro vector of the current field in the overlapping degree calculation circuit 16A is not limited to the above method.
[0041]
Then, the motion vector detection device 10 supplies the motion vector detected by the independent / quasi-independent identical vector determination unit 15 to the correction signal generation unit 20.
[0042]
In addition, the correction signal generator 20 outputs the motion vector V detected by the motion vector detector 10. _t 'As input and X _t = X _t-1 -V _t 'Correction amount X _t A vibration correction signal for the screen is formed, and the vibration correction signal for the screen is supplied to the correction unit 30.
[0043]
The correction unit 30 includes, for example, an address control circuit 31 and a select signal generation circuit 32 to which a screen vibration correction signal is supplied from the correction signal generation unit 20 as shown in FIG. A field memory 33 and a peripheral memory 34 in which video data is written / read in accordance with the supplied address signal, and a select signal supplied from the select signal generating circuit 32 to the video data read from the field memory 33 and the peripheral memory 34. And a selector 35 for selectively outputting the signals in accordance with the conditions.
[0044]
Input video data supplied through the signal input terminal 1 is sequentially written into the field memory 33. Then, the read address of the field memory 33 is controlled according to the motion vector by the vibration correction signal for the screen. As a result, video data obtained by moving one field of input video data in accordance with the motion vector is obtained from the field memory 33. Then, the video data read from the field memory 33 and the peripheral video data read from the peripheral memory 34 are combined by selection by the selector 35, and output from the signal output terminal 2 as video data subjected to screen vibration correction processing. You.
[0045]
In the peripheral memory 34, video data of a peripheral portion corresponding to a correction range of an image based on video data subjected to a vibration correction process of a screen output via the selector 35 is sequentially written as peripheral video data.
[0046]
【The invention's effect】
As is clear from the above description, according to the present invention, one screen is divided into a plurality of macroblocks in such a manner that macroblocks that are not adjacent to each other are generated, and a motion vector is detected for each macroblock. An effective macroblock for detecting a motion vector of the entire screen based on each detected motion vector is specified, a motion vector is detected based on a motion vector of the effective macroblock, and the current screen on which the motion vector is detected is detected. The motion vector is output as a motion vector of the entire screen based on the correlation between the effective macroblock of the above and the position information of the effective macroblock used when detecting the motion vector of the entire screen of the previous screen. Large movements that cannot be determined by the same vector, preparation independent It is possible to reliably detect and output a motion vector such as when entering an object screen, and the probability of detecting a correct motion vector increases. Obtainable.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of an image vibration correction device provided with an image motion vector detection device according to the present invention.
FIG. 2 is a diagram showing a state of block division of a screen in the motion vector detection device.
FIG. 3 is a diagram showing a structure of one block of a screen divided into blocks.
FIG. 4 is a diagram showing a state of a macro block obtained by dividing one screen into 12 parts.
FIG. 5 is a diagram illustrating an example of an occurrence pattern of an independent identical vector detected as a motion vector by an independent / quasi-independent identical vector determination unit.
FIG. 6 is a diagram showing an example of a generation pattern of a quasi-independent identical vector detected as a motion vector by the independent / quasi-independent identical vector determination unit.
FIG. 7 is a diagram showing a macro vector generation state of a previous field in which a motion vector has been detected by the independent / quasi-independent same vector determination unit.
FIG. 8 is a diagram illustrating a macro vector generation pattern of a previous field in which a motion vector is detected by the independent / quasi-independent same vector determination unit.
FIG. 9 is a diagram showing a generation state of a macro vector of a current field in which a motion vector cannot be detected by the independent / quasi-independent same vector determination unit.
FIG. 10 is a diagram illustrating a generation pattern of a motion vector due to an object in a current field.
FIG. 11 is a diagram showing a generation pattern of a motion vector in a current field.
FIG. 12 is a block diagram illustrating a configuration of a correction unit of the screen vibration correction device.
FIG. 13 is a diagram provided for describing a method of determining a motion vector by majority decision of a macro vector.
FIG. 14 is a diagram for explaining a method of determining a motion vector by using macro vectors at spatially separated positions.
FIG. 15 is a diagram provided for describing a failure example of a method of determining a motion vector using macro vectors at spatially separated positions.
[Explanation of symbols]
Reference Signs List 10 motion vector detection device, 11 field difference detection unit, 12 macro vector detection unit, 15 independent / quasi-independent vector determination unit, 16 camera shake vector determination unit, 20 correction signal generation unit, 30 correction unit

Claims (4)

Macro vector detecting means for dividing one screen into a plurality of macro blocks and detecting a motion vector for each macro block in such a manner that macro blocks which are not adjacent to each other are generated;
When substantially the same motion vector is detected by the macro vector detection means in at least two macro blocks that are not adjacent to each other, the macro block is determined as an effective macro block, and a motion vector of the entire screen is detected based on the effective macro block. Motion vector detecting means,
Storage means for storing the position information of the effective macroblock;
When the motion vector of the entire screen is not detected by the motion vector detection means, the position information of the macroblock having the same motion vector of the current screen and the position information of the effective macroblock of the previous screen stored in the storage means Determining means for outputting a motion vector of the entire screen of the current screen based on the time correlation of the motion vector. Dividing one screen into a plurality of macroblocks and detecting a motion vector for each macroblock in such a manner that macroblocks not adjacent to each other occur;
Detecting substantially the same motion vector in at least two of the macroblocks that are not adjacent to each other as a valid macroblock and detecting a motion vector of the entire screen based on the valid macroblock;
Storing the position information of the effective macroblock;
When the motion vector of the entire screen is not detected, based on the time correlation between the position information of the macro block having the same motion vector of the current screen and the stored position information of the effective macro block of the previous screen, the current screen is detected. And outputting a motion vector of the entire screen. Macro vector detecting means for dividing one screen into a plurality of macro blocks and detecting a motion vector for each macro block in such a manner that macro blocks which are not adjacent to each other are generated;
When substantially the same motion vector is detected by the macro vector detection means in at least two macro blocks that are not adjacent to each other, the macro block is determined as an effective macro block, and a motion vector of the entire screen is detected based on the effective macro block. Motion vector detecting means,
Storage means for storing the position information of the effective macroblock;
When the motion vector of the entire screen is not detected by the motion vector detection means, the position information of the macroblock having the same motion vector of the current screen and the position information of the effective macroblock of the previous screen stored in the storage means Determining means for outputting a motion vector of the entire screen of the current screen based on the time correlation of
An image vibration correction apparatus comprising: a correction unit configured to correct a vibration of an image forming the screen based on a motion vector of the entire screen output from the determination unit. Dividing one screen into a plurality of macroblocks and detecting a motion vector for each macroblock in such a manner that macroblocks not adjacent to each other occur;
Detecting substantially the same motion vector in at least two of the macroblocks that are not adjacent to each other as a valid macroblock and detecting a motion vector of the entire screen based on the valid macroblock;
Storing the position information of the effective macroblock;
When the motion vector of the entire screen is not detected, based on the time correlation between the position information of the macro block having the same motion vector of the current screen and the stored position information of the effective macro block of the previous screen, the current screen is detected. Outputting a motion vector of the entire screen of
Correcting the vibration of the image forming the screen based on the output motion vector of the entire screen.

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