KR101063423B1 - Deblock filtering method and apparatus - Google Patents

Abstract

Deblocking filtering method according to an embodiment of the present invention comprises the steps of preparing the first previous unit blocks and the second previous unit blocks included in the previous macroblocks; Preparing processing unit blocks included in a processing macroblock to perform deblocking filtering; Deblocking the first previous unit blocks by using information of the first and second previous unit blocks and the processing unit blocks adjacent to the first previous unit blocks; And deblocking filtering the at least one processing unit block by using information of the first and second previous unit blocks and the processing unit block. According to the present invention, the capacity of the internal memory required in the decoding process of the image data can be reduced, and the bandwidth required for accessing the external memory can be reduced.

Description

Deblock filtering method and apparatus {Method and apparatus for deblock filtering}

The present invention relates to image processing, and more particularly, to a method and apparatus for deblocking filtering of image data.

Deblock filtering is often used to remove the blocking phenomenon in video decoding. The blocking phenomenon refers to a blocking phenomenon in which a boundary between blocks is visually recognizable in a reconstructed image. The blocking phenomenon occurs in the process of compressing and decoding the image data in block units, since the block encoding process includes a quantization process in which an input image is lost. In the process of referring to a neighboring block of a previous or current image at the time of decoding, a blocking phenomenon occurs in the reconstructed image because different blocks are referred to different blocks for each block.

To reduce this blocking phenomenon, deblocking filtering is performed with a deblocking filter for each decoded macroblock. The deblock filter is a filter for smoothing the edges of blocks to improve the quality of decoded frames. The image filtered with the deblocking filter can be used for motion compensated prediction of future frames. In this case, the compression performance can be improved because the future frame is more faithfully restored to the original image.

The above decoding and deblocking filtering process is often performed in an embedded environment. In an embedded environment, it is important to reduce the size of internal memory, and it is important to reduce the bandwidth required to access external memory.

An object of the present invention is to provide a method and apparatus for reducing the capacity of the internal memory required in the deblocking filtering process for image data and reducing the bandwidth required for external memory access.

In order to solve this technical problem, the present invention provides a deblocking filtering method in an aspect. The deblocking filtering method may include preparing first previous unit blocks and second previous unit blocks included in previous macroblocks; Preparing processing unit blocks included in a processing macroblock to perform deblocking filtering; Deblocking the first previous unit blocks by using information of the first and second previous unit blocks and the processing unit blocks adjacent to the first previous unit blocks; And deblocking filtering the at least one processing unit block by using information of the first and second previous unit blocks and the processing unit block.

In order to solve the above technical problem, the present invention provides a deblocking filtering device in another aspect. The deblocking filtering device may include an internal memory configured to store processing unit blocks of a processing macroblock and first previous unit blocks and second previous unit blocks of previous macroblocks to perform deblocking filtering; And deblocking filtering using the unit blocks stored in the internal memory, and performing deblocking filtering on the first previous unit blocks first, and then performing deblocking on at least one unit block among the processing unit blocks. And a decoding processor for performing block filtering.

As described above, the deblocking filtering method and apparatus according to the present invention can reduce the capacity of the internal memory required in the decoding process of an image and reduce the bandwidth required for accessing the external memory.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the structure or size of each component may be exaggerated for convenience and clarity of description, and parts irrelevant to the description are omitted. Like numbers refer to like elements in the figures. On the other hand, the terms used are used only for the purpose of illustrating the present invention and are not used to limit the scope of the invention described in the meaning or claims.

1 is a block diagram illustrating a decoding process of an image. As shown in FIG. 1, the decoding process includes entropy decoding 110, inverse quantization 120, inverse transform 130, intra / inter prediction 140, Deblock filtering (150).

Entropy decoding 110 is a process of decoding an input stream encoded by Variable-Length Coding (VLC). The input stream includes header information, decoding parameters, integer transform information, and the like. The decoding through the entropy decoding 110 is a motion difference (MD), a residual, and the like.

Inverse quantization (120) process is provided by MD, residual, and the like to dequantize. In the inverse quantization process 120, inverse quantization is performed using a quantization value used in encoding.

Inverse quantized information is inverse transformed (eg, IDCT). An integer transform having a characteristic such as 4x4 DCT may be performed in the inverse transform 130. The inverse quantization 120 and the inverse transform 130 generate information about the difference between the reference frame and the current frame. Intra / inter prediction 140 decodes the current frame using information about the difference between the reference frame and the current frame.

The deblock filtering 150 improves the blocking phenomenon that occurs between blocks in the current decoded frame. The deblocking filtering method and apparatus according to the present invention can be applied to such a deblocking filtering process.

FIG. 2 conceptually illustrates one frame in which deblocking filtering is performed.

In FIG. 2, the macroblock MB, 201 is represented by MB (n ,, m) (where 0 ≦ n ≦ N, 0 ≦ m ≦ M, n, m is an integer, and N, M is any one of natural numbers). Determined by the size of the frame). Hereinafter, the macroblock 201 will be described in a format such as MB (n, m) for convenience. In this case, n denotes a column number of the macroblock on the frame 100, and m denotes a row number of the macroblock.

As shown in FIG. 2, one frame 100 includes a plurality of macroblocks 201. The macroblock 201 is the upper macroblock in the upper (contiguous) macroblock, the macroblock in the left side (contiguous) is the left macroblock, the macroblock located on the left and the upper side, that is, the upper left is the upper macroblock, Contiguous macroblocks below are referred to as lower macroblocks. For example, for MB (n, m) shown in FIG. 2, MB (n, m-1) is an upper macroblock, and MB (n-1, m) is a left macroblock, MB (n-1, m). -1) corresponds to the upper left macroblock, and MB (n, m-1) corresponds to the lower macroblock.

Deblock filtering on the above-described frame 100 is sequentially performed from left to right for macroblocks belonging to the same row. After deblocking filtering of macroblocks is performed at a position in the same row, deblocking filtering is sequentially performed in the left-to-right direction with respect to macroblocks located in an adjacent row below it. For example, after deblocking filtering is performed in the direction of MB (0,0) to MB (N, 0) in FIG. 2, deblocking filtering is performed in the direction of MB (0,1) to MB (N, 1). do.

In terms of the advancing direction of the deblocking filtering, the left macroblock, the upper macroblock, and the upper left macroblock for any macroblock may be referred to as the previous macroblock. For example, in FIG. 2, MB (n-1, m), MB (n, m-1), MB (n-1, m-1), etc., for MB (n, m) are previous macroblocks. However, MB (n + 1, m) and MB (n, m + 1) are not macroblocks before, but macroblocks after.

3 is a conceptual diagram illustrating a macroblock. Referring to FIG. 3, the macroblock 201 may have a size of 16 × 16 pixels. The macroblock 201 may be divided into a unit block having a plurality of N × N (N is a natural number of 2 or more) pixel sizes. N may be, for example, 4, in which case the unit block 301 has a 4x4 pixel size, and one macroblock 201 includes 16 unit blocks 301. In FIG. 3, the unit blocks for MB (n, m) are expressed in the form of MB (n, m) _k (where 1 ≦ k ≦ 16 and k is a natural number). In MB (n, m) _k, MB (n, m) indicates which macroblock and _k indicates which unit block.

4 is a diagram illustrating a boundary area of a unit block to which deblocking filtering is applied.

Referring to FIG. 4, deblocking filtering is applied to boundary regions 401, 402, and 403 between unit blocks. In this case, the filtering applied to each of the boundary regions 401, 402, and 403 may be different, and there is a sequence.

For example, weak filtering is applied to an area 401 including the same number of pixels that are symmetrical to each other based on a boundary line between MB (n, m) _1 and MB (n, m) _5. Then, weak filtering is applied to the region 402 including the same number of pixels symmetrically with respect to the boundary line between MB (n, m) _1 and MB (n-1, m) _4. Strong filtering is applied to an area 403 including the same number of pixels that are symmetrical to each other based on a boundary line between MB (n, m) _1 and MB (n, m-1) _13. Strong filtering is then applied to the region 402 containing the same number of pixels symmetrical to each other based on the boundary line between MB (n, m) _1 and MB (n-1, m) _4. As a result, weak filtering and strong filtering are applied to the region 402 at different times.

Here, the weak filtering means filtering using a weak 2/3 tap filter (hereinafter referred to as a weak filter) or a normal 4/3 tap filter (hereinafter referred to as a normal filter). In addition, strong filtering means filtering using a Strong 5 tap filter (hereinafter, referred to as a Strong filter).

Whether to filter using the weak filter, the normal filter, or the strong filter is determined according to the “strength” value of each unit block and whether it corresponds to the boundary of the macroblock. When the intensity is 2 at the boundary of the unit block and the boundary of the macroblock, strong filtering is performed. If the strength is greater than 0 and less than 2 at the boundary of the unit block, weak filtering is performed. Otherwise, no filtering is performed. In addition, strong filtering is not performed in the unit block not located at the boundary of the macro block among the unit blocks. For example, the boundary between MB (n, m) _1 and MB (n, m-1) _13 and the boundary between MB (n, m) _1 and MB (n-1, m) _4 are the macroblocks. Since the boundary is strong, strong filtering may be performed on the boundary regions 402 and 403. However, strong filtering is not performed on the boundary region 401 of MB (n, m) _1 and MB (n, m) _5.

Filtering using the weak filter, the normal filter, the strong filter, and the boundary area to which the filtering is applied are described in RealNetworks, “RealVideo. 9”, External Specification, Version 1.8, September 11, 2007.) will be apparent to those skilled in the art. Therefore, further description is omitted.

FIG. 5 is a diagram illustrating a method for describing a calculation order and a filtering type of deblocking filtering applied to a boundary area of a unit block.

Numerals 1 or 2 in (1) and (2) shown in FIG. 5 indicate a filtering order. That is, (1) is performed first, and (2) is performed. And parentheses () indicate that weak filtering is performed. In the following, weak filtering in the horizontal direction in any unit block as in (1) will be referred to simply as HDW (Horizontal-Down-Weak filtering) for convenience. In HDW, H denotes a horizontal direction, D denotes a downward direction of a unit block, and W denotes a filtering type. Also, as shown in (2), weak filtering in the left vertical direction in an arbitrary unit block will be referred to as vertical-left-weak filtering (VLW) for convenience. In VLW, V is vertical, L is left, and W is weak filtering.

In Figures 3 and 4, the numbers 3 or 4 in the circle (circle) indicate filtering order. That is, ③ must be executed after (2), and ④ must be performed after ③. (Circle) in (3) and (4) indicates that strong filtering is performed (hereinafter, for the sake of convenience, a notation such as ③ may be expressed as <3>, ie, <3> is notation such as ③, <4> is the same notation as ④). In the following, strong filtering on an up horizontal direction in an arbitrary unit block will be referred to as HUS (Horizontal-Up-Strong filtering) for convenience. In HUS, H means horizontal, U means upward, and S means strong filtering. In addition, as in ④, strong filtering in the left vertical direction in an arbitrary unit block will be referred to as VLS (Vertical-Left-Strong filtering) for convenience.

In summary, the filtering order of the unit blocks is HDW, VLW, HUS, VLS. This sequence satisfies the limitation of “Real Video 9”, which requires filtering in the horizontal direction, filtering in the vertical direction, and performing strong filtering after performing weak filtering. However, as described above, the HUS and VLS may not be performed unless the boundary of the unit block corresponds to the boundary of the macroblock.

Hereinafter, in order to clearly show the features and advantages of the deblocking filtering according to the present embodiment, a conventional deblocking filtering operation sequence and filter type will be described.

6 is a diagram illustrating a conventional deblocking filtering operation sequence and filter type. As shown in FIG. 6, the conventional deblocking filtering requires the following macroblocks in addition to the macroblocks to be currently processed (hereinafter referred to as processing macroblocks). For example, when the processing macroblock is MB (n, m) in Fig. 2, MB (n, m + 1), which is a subsequent macroblock, is required. Because, the filtering process of (13), (14), (15), and (16) shown in FIG. 6 is a unit block for MB (n, m + 1), that is, a macroblock, that is, MB (n, m). This is because +1) _1 to MB (n, m + 1) _4 are used. Therefore, according to the method as shown in FIG. 6, deblocking filtering on the processed macroblock is not possible using only the previous macroblock.

As a result, conventionally, after decoding all macroblocks, they are first stored in a frame buffer, and processed macroblocks (ie, MB (n, m)), upper macroblocks, left macroblocks, and lower macroblocks (ie, MBs). Some unit blocks of (n, m-1), MB (n-1, m) and MB (n, m + 1) are brought back into the internal memory. Thereafter, deblocking filtering is performed in the same manner as in FIG. 6. This conventional method requires 28 unit blocks to be stored in the internal memory.

7 is a block diagram illustrating a deblocking filtering apparatus according to the present embodiment. As shown in FIG. 7, the deblocking filtering device 700 includes a decoding processor 710, an internal memory 722, and a GOB buffer 721.

The decoding processor 710 is a part for decoding a unit block and performing deblocking filtering on the decoded unit blocks.

The internal memory 722 is a memory located inside the deblocking filtering device 700 and stores the unit blocks to be processed by the decoding processor 710. Although the internal memory 722 is directly connected to the decoding processor 710 and is very fast, it is not preferable to increase the capacity of the internal memory 722 in terms of cost. The internal memory 722 may store processing macro blocks and unit blocks for previous macro blocks.

The GOB buffer 721 stores unit blocks belonging to the last row of the processing macroblock for use in deblocking filtering of a contiguous lower macroblock with respect to the processing macroblock that is the macroblock to be processed. It is a specific buffer. The GOB buffer 721 may not only store unit blocks for one macroblock, but may store unit blocks for a plurality of macroblocks.

The external memory 730 is a part for storing macro blocks constituting the entire frame. The unit blocks whose deblocking filtering is completed by the decoding processor 710 are stored back into the external memory 730.

FIG. 8 is a diagram conceptually illustrating unit blocks stored in an internal memory of a deblocking filtering device. As shown in FIG. 8, 24 unit blocks are stored in the internal memory 722. The 24 unit blocks are processing unit blocks of the processing macroblock to perform deblocking filtering and first previous unit blocks and second previous unit blocks included in the previous macroblocks.

Here, the processing unit blocks mean all unit blocks included in the processing macroblock. The first previous unit blocks mean contiguous unit blocks above the processing macroblock. The second previous unit blocks mean at least one unit block contiguous to the left of the processing macroblock and a unit block adjacent to the upper left side of the processing macroblock.

For example, in Fig. 8, the processing macroblock is indicated as MB (n, m). In this case, the processing unit blocks are 16 unit blocks of MB (n, m) _1 to MB (n, m) _16. The first previous unit blocks are four unit blocks of MB (n, m-1) _13 to MB (n, m-1) _16. In addition, the second previous unit blocks include three unit blocks MB (n-1, m) _4, MB (n-1, m) _8, MB (n-1, m) _12 and MB (n-1, m-1) _16.

9 is a flowchart illustrating a deblocking filtering method according to the present embodiment.

Referring to FIG. 9, the decoding processor 710 prepares first previous previous unit blocks and second previous unit blocks from previous macroblocks (S91). The first previous unit blocks are prepared by loading the decoding processor 710 from the GOB buffer 721 into the internal memory 722.

10 is an exemplary diagram conceptually illustrating a process of loading first previous unit blocks from a GOB buffer into internal memory.

As shown in FIG. 10, the unit blocks corresponding to the last row of MB (n, m-1), that is, four unit blocks of MB (n, m-1) _13 to MB (n, m-1) _16 Are loaded from the GOB buffer 721 into the internal memory 722.

The second previous unit blocks are prepared by the decoding processor 710 by changing the position on the internal memory 722 of the unit blocks.

11 conceptually illustrates a process of preparing second previous unit blocks. As shown in Fig. 11, MB (n-1, m-1) _16, MB (n-1, m) _4, MB (n-1, m) _8, MB (n-) in the internal memory 722. 1, m) _12 unit blocks 80 are prepared by copying them to the left edge region by changing their positions on the internal memory 722.

The decoding processor 710 prepares the processing unit blocks of the processing macroblock to perform deblocking filtering from the external memory (S92).

12 is a diagram conceptually illustrating a process of preparing processing unit blocks. As shown in FIG. 12, the decoding processor 710 prepares by loading the processing unit blocks from the external memory 730 into the internal memory 722.

When the processing unit blocks, the first and the second previous unit blocks are prepared, the decoding processor 710 first deblocks the first previous unit blocks (S93).

After deblocking filtering on the first previous unit block, the decoding processor 710 performs deblocking filtering on the processing unit block (S94). At this time, except for the unit blocks belonging to the last row of the processing macroblock, the deblocking filtering may be performed on the remaining unit blocks.

FIG. 13 is a diagram illustrating the type and order of filtering applied to unit blocks in a deblocking filtering process.

Referring to FIG. 13, in operation S93, deblocking filtering of the first previous unit blocks may be performed by performing deblocking filtering on the first previous unit blocks in a horizontal direction and on the first previous unit blocks. Performing deblocking filtering on the vertical direction.

That is, deblocking filtering for the first horizontal unit blocks (1 to 4 in FIG. 13) is first performed on the first previous unit blocks, and then deblocking filtering for the vertical direction is performed. During filtering in the lower horizontal direction, weak filtering ((1) in FIG. 13) may be performed from the leftmost unit block. Then, weak filtering is sequentially performed on the unit blocks on the right side ((2) to (4) in FIG. 13).

Thereafter, deblocking filtering on the vertical direction is performed. The deblocking filtering in the vertical direction performs weak filtering (FIG. 13 (5)) and strong filtering (⑥ in FIG. 13) for the leftmost unit block and sequentially performs weak filtering on the right unit blocks. ((7)-(9) of FIG. 13).

When the deblocking filtering on the first previous unit blocks ends, the deblocking filtering on at least one unit block among the processing unit blocks is performed (S94). Referring to FIG. 13, filtering is performed sequentially from (10) to MB (n, m) _1 to MB (n, m) _12. In this process, deblocking filtering may be performed except for the unit blocks MB (n, m) _13 to MB (n, m) _16 belonging to the last row among the unit blocks of the processing macroblock. .

The unit blocks belonging to the last row may be deblocked in the deblocking process for MB (n, m + 1) without performing deblocking filtering in the deblocking process of MB (n, m).

When deblocking filtering is performed in the order shown in FIG. 13, the deblocking filtering order for each unit block is HDW, VLW, HUS, and VLS. For example, looking at the filtering for MB (n, m) _1, it can be seen that HDW ((10)), VLW ((22)), HUS (<25>), and VLS (<26>). As described above, HUS and VLS are not applied when the boundary of the unit block is not the boundary of the macroblock. Therefore, in the case of the unit block that does not include the boundary of the macroblock, the HUS and VLS may not be performed. For example, in the case of MB (n, m) _6, HDW (15) and VLW (30) are performed, and strong filtering is not included.

When the deblocking filtering of (1) to (40) shown in FIG. 13 is completed, the decoding processor 710 backs up the unit blocks on which the deblocking filtering is completed to the external memory 730 (S95).

FIG. 14 is a diagram conceptually illustrating backing up unit blocks having completed deblocking filtering to an external memory. FIG. As shown in FIG. 14, MB (n, m) _1 to MB (n, m) _3, MB (n, m) _5 to MB (n, m) _7, MB (n, m) having completed deblocking filtering ) _9 to MB (n, m) _11 and MB (n-1, m-1) _16, MB (n, m-1) _13 to MB (n, m-1) _15, MB (n-1, m ) _4, MB (n-1, m) _8 and MB (n-1, m) _12 are backed up to the external memory 730.

Thereafter, the decoding processor 710 stores unit blocks for which deblocking filtering of the processing macroblock is not completed for deblocking filtering of the next macroblock (S96).

FIG. 15 is a diagram conceptually illustrating storing, in a GOB buffer, unit blocks in which deblocking filtering is not completed among unit blocks stored in an internal memory. As shown in FIG. 15, MB (n, m) _13 to MB (n, m) _16 unit blocks are stored in the GOB buffer 721. That is, the decoding processor 710 stores the unit blocks belonging to the last row of MB (n, m) in the GOB buffer 721. The MB (n, m) _13 to MB (n, m) _16 unit blocks are used for deblocking filtering of contiguous MB (n, m + 1) below MB (n, m).

When the deblocking filtering for MB (n, m) is completed through the above-described process, the decode for the contiguous MB (n + 1, m) (see FIG. 2) adjacent to the right of MB (n, m) is completed. Block filtering begins.

The deblocking filtering method and the decoder 700 according to the present exemplary embodiment may perform deblocking filtering using an internal memory 722 which is smaller than that of the related art. That is, up to 24 unit blocks are used in the internal memory 722 as compared with 29 conventional unit blocks. This is a very important advantage in embedded environments where large internal memory is difficult to place. The smaller internal memory also reduces the bandwidth for accessing external memory.

In addition, the deblocking filtering process may be performed using only the unit blocks of the previous macroblock already decoded without requiring the unit blocks for the macroblocks not yet decoded. Therefore, it is possible to improve the deblocking filtering speed.

16 is a diagram illustrating a decoding apparatus including the above-described deblocking filtering apparatus. As shown in FIG. 16, the decoding apparatus includes a receiving circuit 740, a deblocking filtering apparatus 700, an external memory 730, and an output circuit 760.

The receiving circuit 740 is a part for receiving compression encoded image data. The receiving circuit 740 transmits the received image data to the deblocking filtering device 700.

The deblocking filtering device 700 is a part for decoding image data and performing deblocking filtering. The deblocking filtering apparatus 700 performs deblocking filtering by the above-described deblocking filtering method. The deblocking filtering device 700 first decodes the image data and stores the image data in the external memory 730. The macroblock to be accessed and processed is stored in the internal memory 722 and then deblocked. In this case, the deblocking filtering may be started for a predetermined macroblock in which decoding is completed, instead of starting the deblocking filtering after the decoding of the entire frame is completed. This is because the processing macroblock can be deblocked filtered using only the previous macroblock. The deblocked filtering part is stored in the external memory 730 again. The deblocking filtering device 700 includes a decoding processor 710, an internal memory 722, and a GOB buffer therein.

The external memory 730 receives and stores data about the macroblock decoded by the deblocking filtering device 700 or the macroblock completed until the deblocking filtering.

The output circuit 760 is a circuit for outputting the data of which deblocking filtering is completed to the outside. Data output to the outside through the output circuit 760 may be connected to the display device.

So far, the present invention has been described with reference to the embodiments shown in the drawings, which are merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. . Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a block diagram illustrating a decoding process of an image.

FIG. 2 conceptually illustrates one frame in which deblocking filtering is performed.

3 is a conceptual diagram illustrating a macroblock.

4 is a diagram illustrating a boundary area of a unit block to which deblocking filtering is applied.

FIG. 5 is a diagram illustrating a method for describing a calculation order and a filtering type of deblocking filtering applied to a boundary area of a unit block.

6 is a diagram illustrating a conventional deblocking filtering operation sequence and filter type.

7 is a block diagram illustrating a deblocking filtering apparatus according to the present embodiment.

FIG. 8 is a diagram conceptually illustrating unit blocks stored in an internal memory of a deblocking filtering device.

9 is a flowchart illustrating a deblocking filtering method according to the present embodiment.

10 is an exemplary diagram conceptually illustrating a process of loading first previous unit blocks from a GOB buffer into internal memory.

11 conceptually illustrates a process of preparing second previous unit blocks.

FIG. 12 is a diagram conceptually illustrating a process in which a decoding processor prepares processing unit blocks of a macroblock to be currently processed from an external memory.

FIG. 13 is a diagram illustrating the type and order of filtering applied to unit blocks in a deblocking filtering process.

FIG. 14 is a diagram conceptually illustrating backing up unit blocks having completed deblocking filtering to an external memory. FIG.

FIG. 15 is a diagram conceptually illustrating storing, in a GOB buffer, unit blocks in which deblocking filtering is not completed among unit blocks stored in an internal memory.

16 is a diagram illustrating a decoding apparatus including the above-described deblocking filtering apparatus.

Claims (18)

Preparing first and second previous unit blocks included in previous macroblocks; Preparing processing unit blocks included in a processing macroblock to perform deblocking filtering; Deblocking the first previous unit blocks using information of the first previous unit blocks, the second previous unit blocks, and processing unit blocks adjacent to the first previous unit blocks; And Deblocking the at least one processing unit block using information of the deblocking filtered first previous unit blocks, the second previous unit blocks, and the processing unit block; The first previous unit blocks are contiguous unit blocks above the processing macroblock, And the second previous unit blocks comprise at least one unit block contiguous to the left of the processing macroblock and a unit block adjacent to the upper left side of the processing macroblock. The method of claim 1, wherein the preparing of the first previous unit blocks and the second previous unit blocks comprises: Loading unit blocks adjacent to the upper side of the processing macroblock stored in a specific buffer into an internal memory; And And changing a storage location in the internal memory for some of the processing unit block of the previous macroblock stored in the internal memory and some of the first previous unit blocks for the previous macroblock. Filtering method. The method of claim 1, wherein the deblocking filtering of the first previous unit blocks comprises: Performing deblocking filtering in a horizontal direction on the first previous unit blocks; And And performing deblocking filtering in a vertical direction with respect to the first previous unit blocks. The method of claim 3, wherein performing deblocking filtering on the vertical direction comprises: And performing deblock filtering in the order of the leftmost unit block from the first previous unit blocks in the order of the rightmost unit block. The method of claim 1, wherein the deblocking filtering of the first previous unit blocks comprises: Performing horizontal-down-weak filtering (HDW) on the first previous unit blocks; And And performing vertical-left-weak filtering (VLW) on the first previous unit blocks. The method of claim 1, wherein the deblocking filtering of the at least one processing unit block comprises: Performing horizontal-down-weak filtering (HDW) on at least one processing unit block; And And performing vertical-left-weak filtering (VLW) on the at least one processing unit block. The method of claim 5 or 6, wherein when the boundary of the first previous unit blocks or the processing unit block corresponds to the boundary of the macroblock, Performing horizontal-up-strong filtering (HUS) on the first previous unit blocks or the processing unit block; And And performing vertical-left-strong filtering (VLS) on the first previous unit blocks or the processing unit block. The method of claim 1, wherein the deblocking filtering of the at least one processing unit block comprises: And deblocking filtering the processing unit blocks except for the processing unit blocks belonging to the last row of the processing macroblock. The method of claim 8, wherein the processing unit blocks belonging to the last row further comprises storing in a specific buffer for processing during the deblocking filtering of the next macroblock adjacent to the processing macroblock. Block filtering method. An internal memory configured to store processing unit blocks, first previous unit blocks, and second previous unit blocks of a processing macroblock to perform deblocking filtering; And Deblock filtering is performed using unit blocks stored in the internal memory, using information about the first previous unit blocks, the second previous unit blocks, and processing unit blocks adjacent to the first previous unit blocks. Deblocking the first previous unit blocks, And a decoding processor configured to deblock at least one of the processing unit blocks by using the information of the deblocking filtered first previous unit blocks, the second previous unit blocks, and the processing unit block. The first previous unit blocks are contiguous unit blocks above the processing macroblock, And the second previous unit blocks comprise at least one unit block contiguous to the left of the processing macroblock and a unit block adjacent to the upper left side of the processing macroblock. The processing unit block of claim 10, wherein the decoding processor loads unit blocks adjacent to the upper side of the processing macroblock stored in a specific buffer into an internal memory, and processes a processing unit block and a previous macro of a previous macroblock stored in the internal memory. The deblock filtering apparatus of claim 1, wherein the deblocking filtering is performed after changing a storage location of the first previous unit blocks for the block in the internal memory. The method of claim 10, wherein the decoding processor deblocks the processing unit blocks except for the processing unit blocks belonging to the last row of the processing macroblock, and then processes the processing unit blocks belonging to the last row of the processing macroblock. A deblocking filtering device, characterized in that it is stored in a specific buffer for processing during the deblocking filtering of the next macroblock adjacent to the lower side. delete delete delete delete delete delete

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