KR100919886B1 - Apparatus and method for controlling skip of motion compensation using characteristic of motion vector in image decoder - Google Patents

Abstract

The present invention relates to a motion compensation skip control apparatus and a method using a motion vector characteristic in an image decoder. In performing image decoding for each macroblock partition, the motion compensation apparatus is activated according to the characteristics of the motion vector. In other words, when the motion vector indicates an integer pixel, the motion compensation reference screen image (for example, the past screen image) is input directly to the screen reconstruction device without passing through the motion compensation device, thereby transmitting data to the outside. Minimize time and system power consumption.

To this end, according to an embodiment of the present invention, in a motion compensation skip control apparatus using a motion vector characteristic in an image decoder, partition information including a motion vector is received for each macroblock partition to be decoded. Input means for; For each macroblock partition, preprocessing means for calculating a reference picture region ('basic reference picture region') indicated by the motion vector using the partition information, and checking whether the corresponding motion vector indicates an integer pixel; And applying a pixel value of the motion compensation reference screen area based on the basic reference picture area to the motion compensation device or skipping the motion compensation device according to whether the corresponding pixel is indicated by the integer pixel. And skip control means.

Description

Motion Compensation Skip Control Device Using Motion Vector Characteristics in Image Decoder and its Method {APPARATUS AND METHOD FOR CONTROLLING SKIP OF MOTION COMPENSATION USING CHARACTERISTIC OF MOTION VECTOR IN IMAGE DECODER}

The present invention relates to a motion compensation skip control apparatus and a method using a motion vector characteristic in an image decoder, and more particularly, to determine whether to activate the motion compensation apparatus according to the characteristics of the motion vector and skip unnecessary motion compensation (Skip). The present invention relates to a motion compensation skip control apparatus using a motion vector characteristic in a video decoder, which minimizes data transmission time and system power consumption to the outside.

The present invention is derived from a study conducted as part of the IT new growth engine core technology development project of the Ministry of Information and Communication and the Ministry of Information and Communication Research and Development. [Task Management Number: 2005-S-078-02, Title: Low-Power Graphic Processing SoC Platform] .

A video decoder (H.264 video decoder) that conforms to the H.264 Recommendations decodes the picture in two modes. Macroblocks (16x16 pixels) of an I picture are decoded in an 'inter mode', that is, a mode that decodes using a result value of an adjacent macroblock in the same picture that is already decoded. Meanwhile, the macroblock (inter mode macroblock) of the P picture is a motion compensation method (a method of interpolating and decoding a predetermined area of the past screen) using an already decoded past screen (reference screen), that is, 'intra mode ( Intra Mode) '.

In the conventional H.264 video decoder, the motion compensation device is always driven (activated) for all the inter mode macroblocks, and the motion compensation is compensated for by inputting the compensation result into the screen reconstruction device. It was. Here, the screen reconstruction apparatus performs a function of configuring a decoded screen by adding the inter prediction screen and the error screen which are the result of the motion compensation apparatus.

However, some inter-mode macroblocks do not need to compensate for motion, and the prior art does not consider these characteristics at all, and uniformly passes the 'motion compensation device' for all inter-mode macroblocks. The inter mode macro block is input to the screen reconstruction apparatus only after the motion compensation execution time has elapsed, thereby causing an unnecessary delay in data transmission to the outside, thereby increasing system power consumption.

In the prior art as described above, motion compensation is always performed for all inter-mode macroblock partitions regardless of the characteristics of the motion vector, thereby causing a delay in data transmission to the outside and an increase in system power consumption. It is an object of the present invention to solve this problem.

That is, the present invention determines whether to activate the motion compensation device according to the characteristics of the motion vector, and skips unnecessary motion compensation, thereby minimizing data transmission time and system power consumption to the outside. It is an object of the present invention to provide a motion compensation skip control apparatus using the characteristics and a method thereof.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned above can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

In order to solve the above object, the present invention is characterized in determining whether to activate (skip) the motion compensation device according to the characteristics of the motion vector in performing image decoding for each macroblock partition.

That is, the present invention is characterized in that, when the motion vector indicates an integer pixel, the motion compensation screen (past screen) is directly input to the screen reconstruction device without passing through the motion compensation device.

More specifically, the present invention, in the motion compensation skip control apparatus using the motion vector characteristics in the video decoder, partition information containing the motion vector for each macroblock partition to be subjected to video decoding Input means for receiving input; For each macroblock partition, preprocessing means for calculating a reference picture region ('basic reference picture region') indicated by the motion vector using the partition information, and checking whether the corresponding motion vector indicates an integer pixel; And applying a pixel value of the motion compensation reference screen area based on the basic reference picture area to the motion compensation device or skipping the motion compensation device according to whether the corresponding pixel is indicated by the integer pixel. And skip control means.

Meanwhile, the present invention relates to a motion compensation skip control method using a motion vector characteristic in a video decoder, wherein a reference picture area ('basic reference picture area) indicated by the motion vector for each macroblock partition to be decoded. Calculating a basic reference screen area for calculating '); A motion vector checking step of checking whether the corresponding motion vector indicates an integer pixel for each macroblock partition; A first skip control step of skipping a motion compensation device and applying a pixel value of the basic reference picture area to the screen reconstruction device when the corresponding motion vector indicates an integer pixel; And if the corresponding motion vector does not indicate an integer pixel, applying a pixel value to the motion compensation apparatus for a region within a predetermined range outside the basic reference picture area and the basic reference picture area ('additional reference picture area'). A second skip control step is included.

The invention as described above, by determining whether to activate the motion compensation device according to the characteristics of the motion vector, it is possible to minimize the data transmission time to the outside and the system power consumption accordingly.

That is, in the present invention, when the motion vector indicates an 'integer pixel', that is, when xFrac and yFrac (luminance signal or chroma signal) values are "0", the motion compensation device is deactivated and the reference screen (past screen) is deactivated. By inputting directly to the screen reconstruction device, that is, by inputting the reference screen to the screen reconstruction device without motion compensation processing after inputting the reference screen through the motion compensation device, the time required for data transmission is reduced, and the system power consumption is reduced. There is an effect that can be reduced.

In addition, the present invention has the effect of reducing the time required for data transmission by transmitting a smaller reference picture using the motion vector characteristic.

1 is a configuration diagram of a motion compensation skip control apparatus using a motion vector characteristic in an image decoder according to the present invention;

2 is a flowchart illustrating an embodiment of a motion compensation skip control method using a motion vector characteristic according to the present invention;

3A is a block diagram of a macroblock MB;

3B and 3C are explanatory diagrams for the type, number, and size of a motion compensation partition according to a macroblock type;

4 is an explanatory diagram of motion compensation according to the position of a motion vector with respect to a luminance signal partition of H.264;

5 is an explanatory diagram of motion compensation according to the position of a motion vector with respect to a chromaticity signal partition of H.264.

* Explanation of symbols on the main parts of the drawings

10: reference frame memory 11: motion compensation skip control device

12: motion compensation device 13: screen reconstruction device

111: partition information input unit 112: preprocessing unit

113: skip control

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of an apparatus for controlling motion compensation skip using a motion vector characteristic in an image decoder according to the present invention.

As shown in FIG. 1, the motion compensation skip control apparatus 11 according to the present invention includes a partition information input unit 111, a preprocessing unit 112, and a skip control unit 113. The motion compensation apparatus 12 determines whether to activate (skip or not) according to the characteristics of the motion vector. That is, the motion compensation skip control apparatus 11 compensates for the motion compensation reference picture (the corresponding reference picture in the reference frame memory) when the motion vector for the macroblock partition to be decoded indicates an integer pixel. The input is directly input to the screen reconstruction device 13 without passing through the device 12.

In the motion compensation skip control apparatus 11 according to the present invention, the decoding operation of one inter macroblock is performed in units listed in a row 310 indicating the number of partitions of FIG. 3B according to the macroblock type MB_TYPE. Assume That is, in the Inter_16x8 mode, the luminance signals Y0, Y1 (size = width x length = 16x8), the chroma signals U0, U1 (size = width x length = 8x4), and the chroma signal V0, V1 (size = width x length = 8x4). Suppose you process them in order.

Hereinafter, each component of the motion compensation skip control apparatus 11 will be described.

The partition information input unit 111 receives partition information on a macroblock partition to be decoded. Here, the 'partition information' includes a motion vector (mv_x, mv_y) of the partition, whether luminance and chroma signals are present, partition coordinates (indicated as pos_x and pos_y as screen coordinates of the partition), partition size (Fig. 3b and Corresponding to the horizontal / vertical pixel size indicated in the partition of FIG. 3C). The partition information is generated during encoding of the video encoder and transmitted to the video decoder.

Meanwhile, the preprocessing unit 112 uses the partition information input through the partition information input unit 111 for each macroblock partition to refer to the reference picture area (hereinafter, referred to as a 'basic reference picture area') indicated by the corresponding motion vector. Calculate using [Equation 1] and [Equation 2], and check whether the corresponding motion vector indicates an integer pixel. Here, the 'basic reference picture area' is a reference picture area (ie, an integer pixel location indicated by the motion vector) indicated by the motion vector 'integer', and is an area corresponding to the partition size.

That is, when the macroblock partition is a partition for the luminance signal, the preprocessing unit 112 obtains the luminance basic reference screen region (luminance basic reference screen region position) by using Equation 1 below, and then macroblock. In the case where the partition is a partition for a chroma signal, Equation 2 below is used to obtain a chromaticity basic reference picture region (a chromatic basic reference picture region position).

Luminance Default Reference Screen Area =

(pos_x + (mv_x / 4) + (0 to x_size-1), pos_y + (mv_y / 4) + (0 to y_size-1))

Chromaticity Default Reference Screen Area =

(pos_x + (mv_x / 8) + (0 to x_size-1), pos_y + (mv_y / 8) + (0 to y_size-1))

The preprocessor 112 checks whether the corresponding motion vector points to an integer pixel for each macroblock partition (that is, whether the motion vector value is 'integer'). That is, the preprocessing unit 112 calculates the characteristic values (xFrac_luma, yFrac_luma) of the corresponding motion vector by using Equation 3 below with respect to the luminance signal, and uses Equation 4 below with respect to the chromaticity signal. After calculating the characteristic values (xFrac_chroma, yFrac_chroma) of the motion vector, it is checked whether the motion vector characteristic value is "0".

xFrac_luma = (mv_x & 3)

yFrac_luma = (mv_y & 3)

Here, & means a bitwise AND operator. Therefore, xFrac_luma = (mv_x & 3) and yFrac_luma = (mv_y & 3) represent 'lower two bits'.

xFrac_chroma = (mv_x & 7)

yFrac_chroma = (mv_y & 7)

Here, & means a bitwise AND operator. Therefore, xFrac_chroma = (mv_x & 7) and yFrac_chroma = (mv_y & 7) represent 'lower 3 bits'.

In other words, in the case of a partition for the luminance signal, the lower two bit values (xFrac_luma, yFrac_luma) of the motion vectors mv_x and mv_y are checked, and if they are all "0", this means that the corresponding motion vectors mv_x and mv_y are 'integer' pixels. It is judged to indicate the case where.

On the other hand, in the case of the partition for the chroma signal, if the lower 3 bits of the motion vectors mv_x and mv_y are all "0", it is determined that the motion vector indicates an integer pixel.

Subsequently, the skip controller 113 determines the pixel value of the motion compensation reference picture area based on the basic reference picture area according to whether the corresponding motion vector indicates an integer pixel (whether the motion vector characteristic value is "0"). Or the motion compensation device 12 is skipped and immediately applied to the screen reconstruction device 13.

In other words, if the corresponding motion vector does not point to an integer pixel, the skip control unit 113 may determine a region within a predetermined range outside the basic reference screen region and the basic reference screen region (hereinafter referred to as an additional reference screen region). Apply pixel values to the motion compensation device 12; If the motion vector indicates an integer pixel, only the pixel value of the basic reference picture area is skipped and applied to the screen reconstruction device 13.

Here, the 'additional reference picture area' is a reference picture area additionally transmitted for motion compensation when the motion vector does not indicate an integer pixel, and the macroblock partition corresponds to a luminance signal or a chroma signal. The range differs depending on whether it

Specifically, in the case of the 'luminance signal', the additional reference picture area is 2 pixels in the left horizontal direction, 3 pixels in the right horizontal direction, 2 pixels in the upper vertical direction, and the bottom, based on the basic reference picture area. It is an area extended by 3 pixels in the vertical direction. In the case of the 'chromatic signal', the additional reference picture area is an area extended by one pixel in the right horizontal direction and one pixel in the lower vertical direction based on the basic reference picture area.

Therefore, when the motion vector does not point to an integer pixel, the skip controller 113 may (1) refer to the motion compensation reference picture area (x_size + 5) x (y_size + 5) from the reference frame memory 10 for the 'luminance' partition. (Which is the area including the luminance basic reference picture region and the luminance supplementary reference picture region) and applies it to the motion compensation apparatus 12, and (2) the motion compensation from the reference frame memory 10 for the 'chromaticity' partition. A reference picture area (x_size + 1) x (y_size + 1) (which includes a chromaticity basic reference picture area and a chromaticity additional reference picture area) and applies it to the motion compensation apparatus 12.

FIG. 2 is a flowchart illustrating a motion compensation skip control method using a motion vector characteristic according to the present invention, and illustrates a motion compensation skip control method performed by the motion compensation skip device 11 of an image decoder.

The motion compensation skip device 11 checks whether the macroblock partition to be decoded is a partition for a luminance signal or a chroma signal (200).

As a result of "200", if the partition is for the luminance signal, the reference picture region (luminance basic reference screen region) (refer to Equation 1) indicated by the motion vector is calculated using the partition information for the corresponding luminance signal partition (see Equation 1). 201). In addition, the motion compensation skip device 11 calculates the characteristic values xFrac_luma and yFrac_luma (see Equation 3) of the corresponding motion vector (201), and then checks whether the values are all "0" (202).

As a result of the motion vector characteristic value check 202, if any of the characteristic values (xFrac_luma and yFrac_luma) of the motion vector is not "0", the motion compensation reference picture area (x_size + 5) x ( y_size + 5 (which is a region including a luminance basic reference picture region and a luminance additional reference picture region, and is taken as a horizontal (x_size + 5) and a vertical (y_size + 5) region) and applied to the motion compensation apparatus 12. (203). As a result, the motion compensation device 12 is driven and the result is input to the screen reconstruction device 13.

As a result of the motion vector characteristic value check 202, if the characteristic values xFrac_luma and yFrac_luma of the motion vector are both "0", the motion compensation reference screen area (in this case, "201") is calculated from the reference frame memory 10. Takes the luminance basic reference picture area (x_size) x (y_size) and skips the motion compensation device 12 (meaning that the prediction screen result is as it is without motion compensation processing) and immediately applied to the picture reconstruction device 13. (204)

On the other hand, if it is determined that the "200" is a partition for the chroma signal, the reference screen area (chromatic basic reference screen area) indicated by the motion vector is calculated using the partition information on the chroma signal partition (see Equation 2). (211). In addition, the motion compensation skip device 11 calculates the characteristic values xFrac_chroma and yFrac_chroma (see Equation 4) of the corresponding motion vector (211), and checks whether the values are all "0" (212).

As a result of the motion vector characteristic value check 212, if any of the characteristic values (xFrac_chroma and yFrac_chroma) of the motion vector is not "0", the motion compensation reference picture area (x_size + 1) x ( y_size + 1) (this is an area including a chromaticity basic reference picture area and a chromaticity addition reference picture area, and is an area having a horizontal (x_size + 1) and a vertical (y_size + 1)) and applied to the motion compensation apparatus 12. (213) As a result, the motion compensation device 12 is driven and the result is input to the screen reconstruction device 13.

As a result of the motion vector characteristic value check 212, when the characteristic values xFrac_chroma and yFrac_chroma of the motion vector are both "0", the chromaticity obtained from the reference frame memory 10 for motion compensation (in this case, "211") Takes the basic reference picture area (x_size) x (y_size), and skips the motion compensation device 12 (meaning that the result is the predicted picture without motion compensation processing) and immediately applies it to the screen reconstruction device 13. (214).

3A is a block diagram of a macroblock MB.

As shown in FIG. 3A, the macroblock MB, which is an area of 16x16 pixels, is composed of a 16x16 pixel area 301 for luminance signals and 8x8 pixel areas 302 and 303 for chroma signals U and V. As shown in FIG. do.

3B and 3C are diagrams for explaining the type, number, and size of a motion compensation partition according to a macroblock type.

Since H.264 allows multiple reference pictures, motion compensation using multiple past pictures (reference pictures) is performed for one MB decoding. In addition, the inter-mode macroblock is divided into MB partitions (16x16, 16x8, 8x16, 8x8) of various sizes according to the macroblock type, and motion compensation is performed. When the macroblock type is 8x8, the sub-block is divided into four 8x8 MB partitions. There is a partition type, and motion compensation is performed according to 8x8, 8x4, 4x8, and 4x4.

For each MB partition, one past screen (reference screen) is given for motion compensation, and in the case of 16x16, 16x8, and 8x16 types, a motion vector indicating an area of the past screen to be used for motion compensation is given for each partition. In the case of the 8x8 type, motion vectors for the 8x8, 8x4, 4x8, and 4x4 types are determined according to the subpartition type.

Specifically, referring to FIG. 3B, the motion compensation process should be performed for each number indicated in the partition number row 310 in order to decode the inter mode macroblock. For example, for a macroblock of Inter_16x8 type 311, motion vectors (mvx, mvy) for [16x8 size Y0, Y1], [8x4 size U0, U1], and [8x4 size V0, V1], respectively. Is present and the past screen region (reference screen region) indicated by the motion vector is determined, the motion compensation is performed by decoding the past screen region determined as an input.

4 is an explanatory diagram of motion compensation according to a position of a motion vector with respect to a luminance signal partition of H.264.

If the motion vector characteristic values for the luminance signal, i.e., xFrac_luma and yFrac_luma (values in 1/4 pixels) are both "0", that is, if the motion vector points to an integer pixel, the pixel value of the reference screen (past screen) Since the motion compensation results as it is, the operation of the motion compensation device is not required, but the present invention utilizes this characteristic. In other words, when the values of xFrac_luma and yFrac_luma are all "0", that is, when the motion vector points to the G pixel 400, the motion compensation result is the same as the G value.

However, as in the prior art, if the area required for motion compensation is found regardless of the values of xFrac_luma and yFrac_luma, 2 pixels in the front and 3 pixels in the horizontal and vertical directions respectively, based on the integer pixel 400 indicated by the motion vector You will need as many additional reference picture areas. Specifically, when the partition size is 4x4, a 9x9 pixel past screen input (luminance basic reference picture area + luminance added reference picture area) may be required for motion compensation.

Therefore, if the integer pixel pointed to by the motion vector is G, and the coordinate of G is (Gx, Gy), the coordinates of A to U are as shown in Equation 5 below. Equation 6] That is, in FIG. 4, the integer pixel value of the motion vector is equal to the G value (G, a, b, c, d, e, f, g, h, i, j, k, n, p, q, r). The motion compensation result for Equation 6 may be as shown in Equation 6 below.

G coordinate = (Gx, Gy),

A coordinate = (Gx, Gy-2), B coordinate = (Gx + 1, Gy-2),

C coordinate = (Gx, Gy-1), D coordinate = (Gx + 1, Gy-1),

E coordinates = (Gx-2, Gy), F coordinates = (Gx-1, Gy), H coordinates = (Gx + 1, Gy),

I coordinate = (Gx + 2, Gy), J coordinate = (Gx + 3, Gy),

K coordinate = (Gx-2, Gy + 1), L coordinate = (Gx-1, Gy + 1), M coordinate = (Gx, Gy + 1),

N coordinate = (Gx + 1, Gy + 1), P coordinate = (Gx + 2, Gy + 1), Q coordinate = (Gx + 3, Gy + 1),

R coordinate = (Gx, Gy + 2), S coordinate = (Gx + 1, Gy + 2),

T coordinate = (Gx, Gy + 3), U coordinate = (Gx + 1, Gy + 3)

G = G

b = (E-5F + 20G + 20H-5I + J + 16) >> 5

h = (A-5C + 20G + 20M-5R + T + 16) >> 5

j = (cc-5dd + 20h + 20m-5ee + ff + 512) >> 10, or

j = (aa-5bb + 20b + 20s-5gg + hh + 512) >> 10

a = (G + b + 1) >> 1

c = (H + b + 1) >> 1

d = (G + h + 1) >> 1

n = (M + h + 1) >> 1

f = (b + j + 1) >> 1

i = (h + j + 1) >> 1

k = (j + m + 1) >> 1

q = (j + s + 1) >> 1

e = (b + h + 1) >> 1

g = (b + m + 1) >> 1

p = (h + s + 1) >> 1

r = (m + s + 1) >> 1

Where >> represents the right shift operator.

In summary, for motion compensation, E (401) 2 pixels left of G 400 in the horizontal direction to J 402 (3 pixels right) in the horizontal direction are required, and G (400) in the vertical direction. From A 403 two pixels up, T 404 three pixels down. As such, an additional necessary portion by 2 pixels to the left or up and 3 pixels to the right or down becomes the 'luminance reference image area', and in the past, such 'luminance addition' The motion compensation is always performed by passing the reference picture area including the reference picture area 'through the motion compensation device 12 regardless of the motion vector characteristic value.

However, in the present invention, when both xFrac_luma and yFrac_luma are "0", the motion compensation device 12 skips only the "luminance basic reference area screen" except the "luminance reference screen area" and the screen reconstruction device 13 Is authorized. Therefore, if the partition size is 4x4, only 4x4 input (luminance default reference screen area) needs to be transmitted and processed.

5 is an explanatory diagram of motion compensation according to the position of a motion vector with respect to the chromaticity signal partition of H.264.

If the values of xFrac_chroma and yFrac_chroma (values in 1/8 pixel units) for the chromaticity signal are "0", that is, if the motion vector points to an integer pixel, the pixel value of the reference screen (past screen) remains motion compensation result. Since the motion compensation device 12 does not require operation, the present invention utilizes this characteristic. That is, if the values of xFrac_chroma and yFrac_chroma are all "0", that is, if the corresponding motion vector indicates the integer pixel A 500, the motion compensation result of the chroma signal is equal to A.

However, as in the prior art, when searching for a region required for motion compensation irrespective of the values of xFrac_chroma and yFrac_chroma, an additional reference picture region of 1 pixel in the horizontal / vertical direction is required based on the integer pixel indicated by the motion vector. Will be done. In detail, when a partition is 2x2 in size, 3x3 pixels are needed as a motion compensation reference screen region for motion compensation.

Meanwhile, as shown in FIG. 5, when the integer pixel value of the motion vector is an A value, the motion compensation value inside the A, B, C, and D rectangles is obtained using Equation 8 below. That is, in FIG. 5, the chroma signal at the pixel position "50" may be obtained through a linear combination of the chroma signals at integer pixels A 500, B 501, C 502, and D 503. By doing so, interpolated pixels are generated at 1/8 pixel intervals between integer pixels of the chroma signal.

Specifically, in the case where the integer pixel indicated by the motion vector is A, if the coordinate of A is (Ax, Ay), the coordinates of B to D are as shown in Equation 7 below. Equation 8 is as follows.

A coordinates = (Ax, Ay)

B coordinate = (Ax + 1, Ay)

C coordinate = (Ax, Ay + 1)

D coordinates = (Ax + 1, Ay + 1)

prePartLXc [x _c , y _c ] = ((8-xFrac_c) * (8-yFrac_c) * A + xFrac_c * (8-yFrac_c) * B + (8-xFrac_c) * yFrac_c * C + xFrac_c * yFrac_c * D + 32)) >> 6

In summary, for motion compensation, it is necessary to extend B (501) one pixel to the right of the A 500 in the horizontal direction, and C (502) one pixel below the A (500) in the vertical direction. It is necessary until). In this way, an additional necessary portion by right or down 1 pixel refers to the 'chromatic additional reference picture area'. In the past, the reference screen area including the 'chromatic additional reference picture area' is included in the motion vector characteristic value. Regardless of whether the motion compensation device 12 is always passed, the motion compensation is always performed.

However, in the present invention, when both xFrac_chroma and yFrac_chroma are "0", only the "chromatic basic reference area screen" except the "chromatic additional reference picture area" is skipped and the screen reconstruction device 13 is skipped. To apply. Therefore, if the partition size is 2x2, only the 2x2 input (color reference screen area) should be transmitted for processing.

In short, as in the present invention, if it is determined whether to drive the motion compensation device according to the characteristic values (xFrac_luma, yFrac_luma, xFrac_chroma, yFrac_chroma) of the motion vector, the decoding is performed only by data transmission of a smaller size. It can reduce power consumption and increase data transmission efficiency.

On the other hand, the method of the present invention as described above can be written in a computer program. And the code and code segments constituting the program can be easily inferred by a computer programmer in the art. In addition, the written program is stored in a computer-readable recording medium (information storage medium), and read and executed by a computer to implement the method of the present invention. The recording medium may include any type of computer readable recording medium.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

Claims (17)

In the motion compensation skip control apparatus using the motion vector characteristics in the image decoder, Input means for receiving partition information including a motion vector for each macroblock partition to be subjected to video decoding; For each macroblock partition, preprocessing means for calculating a reference picture region ('basic reference picture region') indicated by the motion vector using the partition information, and checking whether the corresponding motion vector indicates an integer pixel; And Skip for applying the pixel value of the motion compensation reference screen region based on the basic reference screen region to the motion compensation apparatus or skipping the motion compensation apparatus according to whether the corresponding motion vector indicates an integer pixel. Control means Motion compensation skip control device comprising a. The method of claim 1, The partition information, A motion compensation skip control apparatus comprising a motion vector (mv_x, mv_y), whether a luminance or chroma signal, a partition coordinate (pos_x, pos_y), and a partition size (x_size, y_size). The method of claim 2, The basic reference screen area is If the macroblock partition is a partition for the luminance signal, it is calculated using Equation 1 below, and if the macroblock partition is a partition for the chroma signal, it is calculated using Equation 2 below. Compensation Skip Control. [Equation 1] Luminance Default Reference Screen Area = (pos_x + (mv_x / 4) + (0 to x_size-1), pos_y + (mv_y / 4) + (0 to y_size-1)) [Equation 2] Chromaticity Default Reference Screen Area = (pos_x + (mv_x / 8) + (0 to x_size-1), pos_y + (mv_y / 8) + (0 to y_size-1)) The method of claim 1, The pretreatment means, When the macroblock partition is a partition for a luminance signal, if the lower two bits of the corresponding motion vectors mv_x and mv_y are all “0”, the corresponding motion vector indicates an integer pixel. Motion compensation skip control device. delete The method of claim 1, The pretreatment means, When the macroblock partition is a partition for a chroma signal, if the lower 3 bit values of the corresponding motion vectors mv_x and mv_y are all "0", the corresponding motion vector indicates an integer pixel. Motion compensation skip control device. delete The method of claim 3, wherein The skip control means, If the corresponding motion vector does not point to an integer pixel, pixel values of the basic reference picture area and a region within a predetermined range outside the basic reference picture area ('additional reference picture area') are applied to the motion compensation device, And if the corresponding motion vector indicates an integer pixel, skipping the motion compensation device and applying the pixel value of the basic reference picture area to the screen reconstruction device. The method of claim 8, The additional reference screen area is If the macroblock partition is a partition for a luminance signal, 2 pixels in the left horizontal direction, 3 pixels in the right horizontal direction, 2 pixels in the upper vertical direction, and 3 in the lower vertical direction, based on the corresponding basic reference picture area Motion compensation skip control device characterized in that the area extended by the pixel. The method of claim 8, The additional reference screen area is If the macroblock partition is a macroblock partition for a chroma signal, the motion compensation skip is characterized in that the area is extended by 1 pixel in the right horizontal direction and 1 pixel in the lower vertical direction based on the corresponding basic reference picture area. (Skip) control unit. A motion compensation skip control method using a motion vector characteristic in an image decoder, A basic reference picture area calculation step of calculating a reference picture area ('basic reference picture area') indicated by the corresponding motion vector for each macroblock partition to be decoded; A motion vector checking step of checking whether the corresponding motion vector indicates an integer pixel for each macroblock partition; A first skip control step of skipping a motion compensation device and applying a pixel value of the basic reference picture area to the screen reconstruction device when the corresponding motion vector indicates an integer pixel; And If the corresponding motion vector does not point to an integer pixel, a pixel value is applied to the motion compensation apparatus for a pixel value for a region within a predetermined range outside the basic reference picture area and the basic reference picture area ('additional reference picture area'). 2 skip control steps Motion compensation skip control method comprising a. The method of claim 11, The basic reference screen area calculation step, For each macroblock partition, the motion compensation skip (Skip) is calculated using the motion vector (mv_x, mv_y), partition coordinates (pos_x, pos_y), and partition size (x_size, y_size). A) control method. The method of claim 12, The basic reference screen area calculation step, If the macroblock partition is a partition for a luminance signal, the basic reference picture area is calculated using Equation 5 below, and if the macroblock partition is a partition for a chroma signal, the following Equation 6 is used. A motion compensation skip control method comprising calculating a basic reference picture area. [Equation 5] Luminance Default Reference Screen Area = (pos_x + (mv_x / 4) + (0 to x_size-1), pos_y + (mv_y / 4) + (0 to y_size-1)) [Equation 6] Chromaticity Default Reference Screen Area = (pos_x + (mv_x / 8) + (0 to x_size-1), pos_y + (mv_y / 8) + (0 to y_size-1)) The method of claim 11, The motion vector checking step, When the macroblock partition is a partition for a luminance signal, if the lower two bits of the corresponding motion vectors mv_x and mv_y are all “0”, the corresponding motion vector indicates an integer pixel. How to control motion compensation skip. The method of claim 11, The motion vector checking step, When the macroblock partition is a partition for a chroma signal, if the lower 3 bit values of the corresponding motion vectors mv_x and mv_y are all "0", the corresponding motion vector indicates an integer pixel. How to control motion compensation skip. The method according to any one of claims 11 to 15, The additional reference screen area is If the macroblock partition is a partition for the luminance signal, it extends by 2 pixels in the left horizontal direction, 3 pixels in the right horizontal direction, 2 pixels in the upper vertical direction, and 3 pixels in the lower vertical direction, based on the reference picture area. Motion compensation skip control method, characterized in that the extracted area. The method according to any one of claims 11 to 15, The additional reference screen area is If the macroblock partition is a macroblock partition for a chroma signal, the motion compensation skip is characterized in that the area is extended by 1 pixel in the right horizontal direction and 1 pixel in the lower vertical direction with respect to the reference picture area. Control method.