KR101051871B1 - Apparatus and method for determining boundary strength coefficient in deblocking filter - Google Patents

Abstract

The present invention relates to an apparatus and method for determining boundary strength coefficients in a deblocking filter. A first logic unit for discriminating and determining the boundary strength, a second logic unit for determining the boundary strength using the coding residual coefficients, a third logic unit for determining the boundary strength using the operation result of the integrated comparison unit, and a macro currently processing Miniaturization and low power of the boundary strength determination apparatus by providing an interface strength determination apparatus and a method including a clock gating unit that controls whether the integrated comparison unit, the second logic unit, and the third logic unit operate according to whether or not the block is intra prediction coding. The advantage is that it can be implemented.

H.264, Deblocking Filter, Boundary Strength, Deblocking Filter

Description

Apparatus and Method for Deciding Boundary Strength in the Deblocking Filter}

The present invention relates to an apparatus and method for determining boundary strength coefficients in a deblocking filter. Particularly, an apparatus for determining coefficients of boundary strength of a deblocking filter includes omitting a substantial portion of the process of generating intensity coefficients. It is about providing a method.

Standardized by MPEG-2 and MPEG-4, video compression codecs standardized by the Motion Picture Experts Group (MPEG) under the World Organization for Standardization (ISO), and by the Video Coding Experts Group (VCEG) under the International Telecommunication Union (ITU-T). A video compression codec such as H.263 and H.264 performs encoding and decoding processes based on a block having a predetermined size. In the block-based video compression codec, a blocking artifact phenomenon occurs that degrades the subjective and objective image quality of the image, and a deblocking filter is used in an in-loop or post manner to remove the blocking artifact.

In the H.264 / AVC codec, a block having a size of 16 × 16 is used as a basic unit for image encoding and decoding, which is called a macro block. A video codec encoding process in macroblock units will be described.

1 is a block diagram of a video codec encoder in a general macroblock unit.

The video codec encoder 100 may include a discrete cosine transform (DCT) unit 110, a quantization unit 120, a motion predictor 130, a motion compensator 140, an entropy encoding and decoding unit 150, and an inverse quantization unit. 160, an inverse DCT unit 170, and a deblocking filter unit 180.

First, the video codec encoder 100 searches for a portion of the reference video frame having the smallest difference from the macroblock through intra or inter prediction on the macroblock of the original video frame to be encoded. After that, the residual with the most similar part is obtained. The DCT unit 110 performs a discrete cosine transform by inputting the difference value, and the quantization unit 120 performs a discrete cosine transform on the result. Perform the quantization process.

The entropy encoding and decoding unit 150 performs entropy encoding on the result of the quantization process and finally generates a compressed H.264 / AVC bitstream.

On the other hand, the video codec encoder 100 performs the reconstruction process in the same procedure as the decoding process to generate a reference image frame that will be needed in the next compression process.

That is, the entropy encoding and decoding unit 150 performs an entropy decoding process on the compressed H.264 / AVC bitstream, and the dequantization unit 160 dequantizes it. On the result, the inverse DCT unit 170 performs inverse discrete cosine transform to restore residual information. The difference value information reconstructed as described above is decoded by being combined with a macro block subjected to intra or inter motion compensation.

The decoded image frame expresses a lattice boundary error that does not exist in the original image at the macroblock or subdivided macroblock boundary. The error is a phenomenon in which abnormal cosine transforms are relatively inaccurate for block boundary pixels due to discrete cosine transforms in blocks, lossy compression is performed through quantization, and restored to a value different from the original image in inverse quantization. This is caused by a phenomenon that occurs due to block prediction.

Such blocking artifacts recommend the use of the deblocking filter 180 in modern video compression codecs in order to improve reconstruction quality due to subjective picture quality degradation. In particular, in H.264 / AVC, the deblocking filter 180 is included as a standard so that the deblocking filter 180 is performed in a video encoding and decoding loop.

The deblocking filter 180 of H.264 / AVC distinguishes the edge existing in the original image from the edge generated by the blocking artifact, and does not deblock the edge existing in the original image. have.

In addition, the deblocking filter 180 classifies a condition in which blocking artifacts occur and performs stronger filtering on edges having a condition in which blocking artifacts are expected to appear strongly. Conversely, weak filtering is applied to edges with conditions where blocking artifacts are expected to appear weak. That is, the deblocking filter 180 performs filtering by adjusting the strength of the filtering.

Due to the very adaptive characteristics, the compression ratio can be improved compared to the same image quality, but on the contrary, the complexity and calculation amount of the deblocking filter 180 are increased to perform deblocking filtering. Therefore, it is necessary to reduce the complexity of the deblocking filter 180 and to improve the filter calculator and the interface strength determination unit to operate the deblocking filter 180 at low power.

In the deblocking filter of H.264 / AVC, the boundary strength factor is used to determine the type of filter applied and the filtering strength. The interface intensity factor may have a value of 0 to 4. At this time, if the boundary strength coefficient has a value between 0 and 3, a filter having a normal intensity is applied. If the boundary strength coefficient has a value of 4, a strong strength filter is applied. In addition, the interface intensity coefficient is required as an input of a process of obtaining a deformation limit used in a clipping process, which is usually a part of the filter operation of the intensity.

As described above, since the boundary strength coefficient serves as a basis for judgment in performing different filtering equations according to the adaptability in the deblocking filter device, the boundary strength coefficient determination process is a process that must be performed before the actual filtering is performed. .

In the general deblocking filter, the boundary strength coefficient determination process may be implemented in two ways depending on the processing time of the boundary strength coefficient.

The first method is a method of performing filter operation on pixel data after obtaining all boundary strength coefficients of 32 edges among 4x4 blocks belonging to a macroblock to be processed. In the second method, a filter operation is performed on pixel data to be processed at the same time, and a boundary strength coefficient of an edge between 4 × 4 blocks currently processed is determined.

The second method is mainly used when a parallel processor or parallel hardware is used to improve the performance of the deblocking filter by using a parallel characteristic.

In general, due to many judgment conditions, the time required for generating the boundary strength coefficients is considerable, so to implement a high-performance deblocking filter, the operation on the normal intensity filter and the strong intensity filter are performed simultaneously. The result must be exported to the output according to the boundary strength factor generated by the MUX.

The normal intensity filter and the strong intensity filter should be distinguished and applied according to the boundary strength coefficients of the filtering edges. It can be seen that the area of the filter calculation unit for the increase is significant. In addition, it is difficult to predict the boundary strength coefficients to be generated, and thus power consumption is high because the circuit must be operated at all times for all filter modes.

In the first method, since the boundary strength coefficient is first determined and then the filter operation is performed, an additional clock cycle for the boundary strength coefficient determination process is required in addition to the clock cycle for the pixel data processing. Therefore, the overall deblocking filter processing time increases, but since the interface strength coefficients for the edges to be filtered before the filter operation are known, low power techniques such as clock gating are applied to the filter operation according to the boundary strength coefficients. The deblocking filter can be reduced in power.

Accordingly, the present invention is to solve the problems according to the prior art, and provides an apparatus and method for determining the boundary strength coefficient in a deblocking filter that can operate at low power and low complexity through the improvement of the filter calculation unit and the interface strength determination unit. For that purpose.

In accordance with an aspect of the present invention, an apparatus for determining boundary strength in a deblocking filter may include: an integrated comparison unit configured to compare whether a reference image is identical between adjacent blocks, and motion vectors in X and Y directions between adjacent blocks; A first logic unit to determine a coding type of the macro block to determine the boundary strength; A second logic unit to determine the boundary strength using the coding residual coefficients; A third logic unit that determines an interface strength by using a calculation result of the integrated comparison unit; And a clock gating unit configured to control whether the integrated comparison unit, the second logic unit, and the third logic unit operate according to whether or not the macro block currently processed is intra prediction coding.

In this case, the comparison result buffer may further include a comparison result buffer register for storing the calculation result.

When the macroblock currently being processed is intra prediction coded, the clock gating unit may stop operations of the integrated comparison unit, the second logic unit, and the third logic unit.

When the left or the upper macroblock of the macroblock currently being processed is intra predictively coded, the clock gating unit may stop operations of the integrated comparison unit, the second logic unit, and the third logic unit.

The integrated comparison unit may receive reference image information, X direction motion vector information, and Y direction motion vector information according to an operation cycle.

The integrated comparison unit may determine whether the reference image is identical between blocks based on the reference image information input in the first cycle, compare whether the absolute value of the X-axis motion vector difference between blocks in the second cycle is greater than or equal to a threshold value, and It may be characterized by comparing whether the absolute value of the Y-axis motion vector difference between blocks in a cycle is greater than or equal to a threshold value.

The integrated comparison unit may include: first and second ports for receiving first and second signals; And a third port for receiving a threshold signal.

According to another aspect of the present invention, a method for determining boundary strength in a deblocking filter includes: a first step of performing coding type determination, coding residual coefficient determination, and reference image comparison of a macroblock at one clock; A second step of comparing a motion vector in any one axial direction at a next clock; A third step of comparing a motion vector in a direction perpendicular to the axis direction of the second step in a next clock; And a fourth step of determining boundary strength using the determination or comparison result made in the first, second, and third steps as one operation period, wherein the macroblock currently processed in the first step is intra prediction coded. If it is determined, the operation of the second and third steps is not performed.

The method may further include selectively performing normal intensity filtering or strong intensity filtering according to the determined boundary strength in the next period of one operation period including the first to fourth steps.

In this case, the axial direction of the second step may be characterized in that the X-axis direction or the Y-axis direction of the rectangular coordinate system.

The deblocking filter according to another aspect of the present invention determines the boundary strength by determining the coding type of the macroblock, and determines the boundary strength using the coding residual coefficients between the adjacent blocks and the adjacent block according to whether the macroblock is intra-predictive coding. And an interface strength determiner for selectively determining an interface strength using the same information of the reference image and Y, Y direction motion vector information between adjacent blocks.

As described above, the apparatus for determining the boundary strength coefficient in the deblocking filter according to the present invention can omit a substantial part of the entire process according to the encoding and decoding coding conditions, thereby obtaining the same results as the process of determining the boundary strength coefficient in the standard, but also having low power. It can be operated as, and the area occupied by the calculation unit is also small. Such a deblocking filter has an effect that it is suitable for a mobile device according to a standard such as H.264.

Hereinafter, an apparatus and method for determining an interface strength coefficient in a deblocking filter according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a diagram illustrating a method for determining a boundary strength coefficient by a deblocking filter according to the present invention.

When filtering vertical edges based on the edge to be filtered, the left 4 × 4 block is defined as a P block, and the right 4 × 4 block is defined as a Q block. Meanwhile, based on the horizontal edge, the upper 4x4 block is defined as a P block, and the lower 4x4 block is defined as a Q block. The deblocking filter first checks whether at least one block of the P block or the Q block is coded in the intra prediction mode (S201).

If either block of the P or Q blocks is coded in the intra prediction mode in step S201, the deblocking filter device determines whether the edge to be filtered is located at the boundary of the macro block (S202).

If the edge to be filtered in step S202 is located at the boundary of the macro block, the deblocking filter determines the boundary strength coefficient value (BS) as 4. On the other hand, if the edge to be filtered in step S202 is not located at the boundary of the macro block, the deblocking filter determines the boundary strength coefficient value as 3.

On the other hand, if both the P block and the Q block are coded in the inter prediction mode in step S201, it is determined whether a coded residual value exists in step S203 (S203). If the encoding residual coefficients exist, the boundary strength coefficient value is determined as 2.

On the other hand, if the encoding residual value coefficient does not exist, the deblocking filter determines whether the reference pictures of the P block and the Q block are the same (S204). In addition, the deblocking filter determines whether the absolute value of the difference between the X and Y direction motion vectors of the P block and the Q block is 4 * 1/4 pixels or more (S205).

If the reference pictures of the P block and the Q block are the same in steps S204 and S205, and the absolute value of the difference between the X and Y direction motion vectors of the P block and the Q block is less than 4 * 1/4 pixels, the boundary strength coefficient value is 0. This results in no deblocking filtering. On the other hand, when the boundary strength coefficient value is not 0 in S204 and S205, the boundary strength coefficient value is 1.

The above-described process of determining the boundary strength coefficient of FIG. 2 shows the same result as that of the H.264 standard for all 32 edges among 16 4 × 4 blocks belonging to a macroblock.

In a typical deblocking filter, assuming that an edge strength coefficient for an edge can be obtained in one clock cycle, a total of 32 clock cycles are consumed. Considering that about 200 clock cycles are consumed as the time for deblocking filtering at this point, the determination of the boundary strength coefficient, which consumes 32 clock cycles, is a significant part.

3 is a block diagram illustrating a boundary strength determination device of a deblocking filter according to an embodiment of the present invention.

Referring to FIG. 3, the boundary strength determining apparatus 200 includes a first logic unit 210, a second logic unit 220, a third logic unit 230, an integrated comparison unit 240, and a clock gating unit 250. The boundary strength coefficient determiner 260, the mux 270, the plurality of buffer registers 281 and 282, the controller 291, the counter 292, and the like may be configured.

The first logic unit 210 is a component for determining whether the boundary strength coefficient is three or four. In detail, the first logic unit 210 receives the coding information of the macro blocks and determines the boundary strength coefficient through the input.

The second logic unit 220 is a logic organization for determining whether the boundary strength factor is two. Specifically, the coded residual coefficient information is input to determine whether the boundary strength coefficient is 2, and the result is transmitted to the boundary strength coefficient determination unit 260.

Finally, the third logic unit 230 is a logic organization for determining whether the boundary strength factor is one. The third logic unit 230 determines information about whether the reference image stored in the buffer register 281 is the same, information about whether the absolute value of the X-direction motion vector difference is greater than or equal to the threshold value, and the Y direction. It is input according to a decision information cycle on whether an absolute value of a motion vector difference is greater than or equal to a threshold.

The interface strength coefficient determiner 260 receives information for determining the interface strength coefficient from the first logic unit 210, the second logic unit 220, and the third logic unit 230, and the flow diagram of FIG. 2. Determine the interface strength factor accordingly.

Buffer registers 281 and 282 correspond to components that store the compared results. Two buffer registers 281 and 282 exist in the interface strength determining apparatus 200. One of them is a comparison result buffer register 281 having a size of 3 bits that stores the result calculated by the integrated comparison unit 240, and the other is an interface strength coefficient buffer register 282 in which the determined boundary strength coefficient is temporarily stored. )to be.

In addition, the clock gating unit 250 controls the second logic unit 220 and the third logic unit 230, and performs a clock gating operation for controlling the operation of these. Through the clock gating operation, power consumed in determining the boundary strength can be reduced.

The integrated comparison unit 240 performs three operations: ① reference image comparison operation, ② absolute value and threshold value comparison operation in the X-direction motion vector, ③ absolute value and threshold value comparison operation in the Y-direction motion vector. That is, the integrated comparison unit 240 alternately performs the comparison operations of ①, ②, and ③ according to the value of the counter 292.

The counter 292 is a component that periodically generates a counter value. In this case, the counter 292 may be provided inside the boundary strength determination apparatus 200 as shown in FIG. 3, but may be replaced by another counter outside the boundary strength determination apparatus 200.

The interface strength coefficient determiner 260 receives the result values of the first logic unit 210, the second logic unit 220, and the third logic unit 230, and outputs the boundary strength coefficients of the edge currently being processed. The interface intensity coefficient is output to the data pixel operation unit (not shown) in the deblocking filter 180 and referred to during the filtering operation, and stored in the interface intensity coefficient buffer register 282.

4 is a view showing an operation method of the boundary strength determination apparatus according to the present invention.

The boundary strength coefficient determination process is started for the edges between the 4 × 4 blocks to be processed first 4 clock cycles before the pixel data filtering for the macro block to be processed.

In a first cycle, the first logic unit 210 determines whether the macroblock currently being processed is coded in the intra prediction mode. That is, it is determined whether both the left macro block (P block) and the right macro block (Q block) are coded in the intra prediction mode. At the same time, the second logic unit 220 determines whether a coded residual is present in the P block or the Q block with respect to the interface between the macro blocks. At the same time, the integrated comparison unit 240 compares the reference images of the P block and the Q block and generates a comparison result (S401).

In a second cycle, the integrated comparison unit 240 obtains a difference between the X-direction motion vectors of the P block and the Q block, compares the result with a threshold value, and generates a comparison result (S402).

In the third cycle, the integrated comparison unit 240 obtains a difference between the Y-direction motion vectors of the P block and the Q block, compares the result with a threshold value, and generates a comparison result (S403).

In the fourth cycle, the third logic unit 230 determines whether the boundary strength coefficient is 1 or 2 by combining the calculation results of the integrated comparison unit 240 in the first, second, and third cycles. The boundary strength coefficient determiner 260 combines the results of the first, second, and third logic units 210, 220, and 230 and outputs the boundary force coefficients for the edges to perform the data pixel filtering operation for the next four clock cycles. (S404). In addition, in the fourth cycle, it is checked whether the macro block or the left to upper macro blocks thereof are coded in the intra prediction mode (S404).

5 is a view showing an operation method of the boundary strength determination apparatus according to the present invention.

The deblocking filter performs i) pixel data filtering operations for the next 4 clock cycles using the boundary strength coefficients generated as above from the edges between the 4 × 4 blocks to be processed first. At the same time, the boundary strength determination apparatus 200 in the deblocking filter performs a boundary strength coefficient determination process for the filtering edges between the 4 × 4 blocks to be processed next.

At this time, the boundary strength determination apparatus 200 determines whether the P block or the Q block is encoded in the intra prediction mode (S501).

When both the P block and the Q block are encoded in the inter prediction mode in operation S501, the boundary strength determination apparatus 200 performs the processes of S511 to S514.

That is, in the first cycle, it is determined whether a coded residual coefficient remains in the P or Q block of the edge, and the integrated comparison unit 240 performs a reference image comparison (S511). In a second cycle, the integrated comparison unit 240 obtains a difference value between the X-direction motion vectors of the P block and the Q block and compares the threshold value with the threshold value (S512). In the third cycle, the integrated comparison unit 240 obtains a difference value between the Y-direction motion vectors of the P block and the Q block and compares the threshold value with the threshold value (S513). In the fourth cycle, the generated surface strength coefficients for the edges to be performed during the next four clock cycles are determined by combining the generated results (S514).

On the other hand, when at least one of the P block or the Q block is encoded in the intra prediction mode in operation S501, the clock gating unit 250 of the boundary strength coefficient determination apparatus 200 is activated to activate the second logic unit 220 and the first logic unit. 3 The operation of the logic unit 230 is stopped.

Accordingly, the second logic unit 220 checks whether there are encoding residual coefficients with respect to the edge of the current macroblock, and compares the reference images and X-direction motion vector differences that the integrated comparison unit performs in the first, second, and third cycles. Absolute and threshold comparison process of is stopped. Processes S521 to S523 in FIG. 5 mean this.

However, even in this case, a process in which the value of the boundary strength is set to 4 or 3 is performed according to whether the edge is the macroblock boundary edge or the inner edge in the fourth cycle (S524).

The boundary strength determination process described above is performed on all remaining edges of the macroblock currently being processed.

In this case, if the deblocking filter is performed on the 16 × 16 luma block and then the deblocking filter is performed on the two 8 × 8 chroma blocks in turn, the boundary strength coefficients of all 32 edges of the 16 × 16 luma block are applied. And store them in a temporary storage space, such as a register consisting of flip-flops, and then temporarily calculate the boundary strength coefficients when the boundary strength coefficients are needed for the edges of two 8 × 8 chroma blocks. A device can be added that reuses the stored value.

Whether an intra prediction mode or an inter prediction mode is used in encoding and decoding of a video block is performed in units of 16 × 16 macroblocks. As described above, if the P block or the Q block is coded in the intra prediction mode during the boundary strength determination in the H.264 / AVC standard, the boundary strength coefficient has a value of 4 or 3.

Therefore, if the macroblock to be processed is coded in the intra prediction mode, the boundary strength coefficients of all edges located at the macro block boundary are 4, and the boundary strength coefficients of all edges located inside the macro block are 3.

Therefore, only the determination of the coding mode of the macroblock, the left macroblock, and the upper macroblock to be processed can omit all of the determination processes corresponding to the boundary strength coefficients 4 and 3 for the 32 edges.

In addition, the determination process of the boundary strength coefficient may be considered as priority logic. When it is determined as 4 or 3 of the boundary strength coefficient, the determination process for the intensity coefficients 2, 1, and 0 may not be performed separately. If the calculation amount, the complexity of the calculation unit, the power, and the like generated due to the process of determining whether the boundary strength coefficient is 1 by using this, are omitted, it is preferable to implement a small, low power deblocking filter.

When a macro block is predicted and compensated in an intra mode or an inter mode during encoding and decoding of a video codec, the macro block is encoded or decoded into pieces having a smaller size. In this case, the smallest execution unit is a 4 × 4 pixel data block. Also, even in the discrete cosine transform and the inverse transform process, the smallest unit of execution is a 4 × 4 block.

Therefore, all pixel data in the 4x4 block have the same conditions for determining the boundary intensity coefficient. Assuming that there are 4 × 4 blocks at the top, bottom, left, and right sides of the 4 × 4 block, each of the edges at the top, bottom, left, and right edges of the 4 × 4 block has four boundary strength coefficients per edge. There is a need to carry out the judgment process. At this time, the four boundary strength coefficients have the same value as the result. Therefore, after determining the intensity coefficient for each of the four edges of the top, bottom, left, and right, the values can be shared and used in the four pixel data filtering operations constituting one edge.

Based on the characteristics of the video encoding and decoding process, the boundary strength coefficient for one edge is determined by 4 × 4 every four clock cycles instead of determining the boundary strength coefficient for an edge in pixel units every one clock cycle. It is preferable to determine the boundary strength coefficient for the edge of the block unit, and use the same value to apply the same value to the edge of the four pixel units constituting one 4x4 edge.

In addition, instead of using the fact that multiple comparison operations are processed in parallel in multiple comparison units and require a large area, they are processed at a time by one integrated comparison unit. One can think of ways to reduce the area.

Meanwhile, the integrated comparison unit 240 shown in FIG. 3 receives two signals to be compared and a threshold thereof as inputs.

The integrated comparison unit 240 first generates a difference value by calculating a difference between two input signals by performing a two's complement operation. For the difference value generated in the second step, it is determined whether the difference value is negative, and if it is negative, the difference value is converted to a positive number using a two's complement relationship. Through this process, the absolute difference between the two input signals can be obtained. Finally, the absolute difference created in this way is finally compared with the threshold value, and the resultant signal is output. By using this operation, an operation of comparing the absolute value of the difference value of the X-direction or the Y-direction motion vector with the threshold value may be performed.

Meanwhile, the process of determining whether the reference images are the same may also be performed using the integrated comparison unit. In the video encoding and decoding process, index numbers are assigned to reference images to distinguish the reference images. The integrated comparison unit may determine whether the two reference images are the same by setting the threshold value to 0.

Eventually, the reference image is compared in the first, second, and third cycles using only one integrated comparison unit 240, the absolute value of the X-direction motion vector difference is compared with the threshold value, and the absolute value of the Y-direction motion vector difference is determined. The comparison can be performed.

Although the present invention has been described in detail through the representative embodiments, those skilled in the art to which the present invention pertains can make various modifications without departing from the scope of the present invention. Will understand. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

1 is a block diagram of a video codec encoder in units of typical macroblocks.

2 illustrates a method for determining a boundary strength coefficient by a deblocking filter in accordance with the present invention.

3 is a block diagram of an apparatus for determining boundary strength among deblocking filters according to an exemplary embodiment of the present invention.

4 is a view showing an operation method of the boundary strength determination apparatus according to the present invention.

5 is a view showing an operation method of the boundary strength determination apparatus according to the present invention.

Description of the Related Art [0002]

200: boundary strength determination device

210: first logic unit

220: second logic unit

230: third logic unit

240: integrated comparison unit

250: clock gating unit

260: interface strength coefficient determination unit

270: mux

281: comparison result buffer register

282: interface strength coefficient buffer register

291: control unit

292: Counter

Claims (11)

In the boundary strength determination apparatus in the deblocking filter, An integrated comparison unit for comparing whether the reference image is identical between adjacent blocks and a motion vector in the X and Y directions between the adjacent blocks; A first logic unit to determine a coding type of the macro block to determine the boundary strength; A second logic unit to determine the boundary strength using the coding residual coefficients; A third logic unit that determines an interface strength by using a calculation result of the integrated comparison unit; And According to whether the macro block to be processed currently intra prediction coding, including a clock gating unit for controlling the operation of the integrated comparison unit, the second logic unit and the third logic unit, When the macroblock to be processed is intra prediction coded or when the left or upper macroblock of the macro block to be currently processed is intra prediction coded, the clock gating part is the integrated comparator, the second logic part, and the third. An interface strength determining apparatus characterized by stopping the operation of the logic unit. The method of claim 1, And a comparison result buffer register for storing the calculation result of the integrated comparison unit. delete delete The method according to claim 1 or 2, The integrated comparison unit, An apparatus for determining boundary strength according to an operation cycle, wherein the reference image information, the X-direction motion vector information, and the Y-direction motion vector information are received. The method of claim 5, The integrated comparison unit, It is determined whether the reference pictures are identical between blocks based on the reference picture information input in the first cycle. Compares the absolute value of the X-axis motion vector difference between blocks in the second cycle is greater than or equal to the threshold value, And determining whether the absolute value of the Y-axis motion vector difference between blocks in the third cycle is greater than or equal to the threshold value. The method of claim 6, The integrated comparison unit, First and second ports for receiving first and second signals; Wow And a third port for receiving a threshold signal. In the boundary strength determination method in the deblocking filter, A first step of performing a coding type determination, a coding residual coefficient determination, and a reference image comparison of a macroblock at one clock; A second step of comparing a motion vector in any one axial direction at a next clock; A third step of comparing a motion vector in a direction perpendicular to the axis direction of the second step in a next clock; And In one operation period, the fourth step of determining the boundary strength using the determination or comparison result made in the first, second and third steps, When it is determined that the macroblock currently processed in the first step is intra prediction coded, the operation of the second step and the third step may not be performed. And selectively performing normal intensity filtering or strong intensity filtering according to the determined boundary strength in the next period of one operation period including the first to fourth steps. . delete The method of claim 8, And the axial direction of the second step is an X-axis direction or a Y-axis direction of the Cartesian coordinate system. delete

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