KR20090018432A - Method for encoding and decoding video signal and apparatus thereof - Google Patents

Method for encoding and decoding video signal and apparatus thereof Download PDF

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KR20090018432A
KR20090018432A KR1020070082876A KR20070082876A KR20090018432A KR 20090018432 A KR20090018432 A KR 20090018432A KR 1020070082876 A KR1020070082876 A KR 1020070082876A KR 20070082876 A KR20070082876 A KR 20070082876A KR 20090018432 A KR20090018432 A KR 20090018432A
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picture
residual
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Korean (ko)
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박승욱
전병문
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엘지전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • H04N19/51—Motion estimation or motion compensation
    • H04N19/513—Processing of motion vectors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • H04N19/51—Motion estimation or motion compensation
    • H04N19/573—Motion compensation with multiple frame prediction using two or more reference frames in a given prediction direction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/70—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by syntax aspects related to video coding, e.g. related to compression standards
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
    • H04N19/86—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving reduction of coding artifacts, e.g. of blockiness

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Abstract

A video encoding and decoding method and apparatus for encoding and decoding a video signal are provided to encode a video signal by using motion compensation on a residual domain. A residual predictive picture is produced by performing the motion compensation of a residual picture about a reference picture(S200). A residual picture for a current picture is produced on the basis of a residual signal on a residual domain, a signal based on a difference between the residual predictive picture and the residual picture for the current picture(S210). A predictive picture is produced by performing the motion compensation of the reference picture(S230). The current picture is produced based on the predictive picture and the residual picture for the current picture.

Description

Method for encoding and decoding video signal and apparatus therefor

The present invention relates to a video encoding and decoding method and apparatus for encoding and decoding a video signal using motion compensation on a residual domain.

Motion compensation methods have been applied in various fields to reduce temporal redundancy. In the video encoding and decoding process, the current picture is divided into macroblocks of a constant size, and a motion vector indicating where each macroblock has moved has been calculated. Then, motion compensation is performed using the calculated motion vector.

The amount of data to be encoded can be reduced by encoding a residual signal which is a difference between the macroblock of the current picture and the macroblock of the predictive picture obtained by motion compensation. That is, instead of directly transmitting image data of the current picture, the motion vector and the residual signal are encoded and transmitted to the decoding side.

FIG. 1 shows an example of a residual picture composed of a prediction picture and a current picture. If (a) of FIG. 1 is referred to as the residual picture for the reference picture, and (b) of FIG. 1 is referred to as the residual picture for the current picture, it can be seen that temporal redundancy still exists in the residual picture generated through motion compensation. have.

However, in general, such temporal redundancy is not considered in a video encoding process. Therefore, it is necessary to consider a method of encoding and decoding a video signal more efficiently in consideration of the redundancy present in the residual picture.

Accordingly, an object of the present invention is to provide a video encoding method and apparatus for encoding a video signal using motion compensation on a residual domain.

Another object of the present invention is to provide a video decoding method and apparatus for decoding a video signal encoded using motion compensation on a residual domain.

According to an embodiment of the present invention, a video encoding method includes generating a first residual picture for a reference picture, generating a second residual picture for the current picture, and referring to the first residual picture, Calculating a motion vector for the second residual picture, and motion compensating the first residual picture based on the motion vector to generate a residual prediction picture, the difference between the residual prediction picture and the second residual picture; Generating a based signal.

According to an aspect of the present invention, there is provided a video encoding apparatus comprising: a motion estimation unit configured to calculate a motion vector of a second residual picture with respect to a current picture by referring to a first residual picture with respect to a reference picture, and the first residual picture And a motion compensator for generating a residual prediction picture by motion compensation using the motion vector, and a difference generator for generating a signal based on a difference between the residual prediction picture and the second residual picture.

According to the present invention, in the encoding process, signaling a flag indicating whether to use motion compensation on the residual domain at the first syntax level in the video sequence, and if the flag is activated, the residual for the reference picture There is provided a video encoding method comprising a motion vector for generating a residual prediction picture by motion compensation of a picture and a residual signal for generating a residual picture for a current picture from the residual prediction picture.

On the other hand, the video decoding method according to the present invention, motion compensation of the first residual picture for the reference picture to generate a residual prediction picture, a second for the current picture based on the residual prediction picture and the residual signal on the residual domain Generating a residual picture, generating a predictive picture by motion compensating the reference picture, and generating a current picture based on the predictive picture and the second residual picture.

In addition, the video decoding apparatus according to the present invention for achieving the above object, a motion compensation unit for generating a residual prediction picture by motion compensation of the first residual picture for the reference picture, and generating a predictive picture by motion compensation of the reference picture A first adder for generating a second residual picture for the current picture based on the sum of the residual prediction picture and the residual signal on the residual domain, and the current picture based on the sum of the prediction picture and the second picture. And a second adder to generate.

According to the present invention, in the decoding process, receiving and processing a flag indicating whether to use motion compensation on a residual domain at a first syntax level in a video sequence, and if the flag is activated, within the video sequence. Receiving and processing a motion vector and a residual signal on the residual domain, and performing motion compensation on a first residual picture for a reference picture based on the motion vector to generate a residual prediction picture, and generating the residual prediction picture and the residual domain. A video decoding method is provided that includes generating a residual picture for a current picture based on a residual signal of an image.

In order to achieve the above object, the present invention provides a recording medium that can be read by a processor that records a program for executing the method in the processor.

According to the present invention, the video signal may be encoded using the residual signal on the residual domain which further reduces the redundancy present in the residual signal by using the motion compensation on the residual domain in addition to the general motion compensation. As a result, the amount of data to be encoded can be reduced, so that the video signal can be encoded and decoded more efficiently.

Hereinafter, with reference to the drawings will be described the present invention in more detail.

The video encoding and decoding method according to the present invention basically uses motion compensation on the residual domain. That is, instead of based on the motion vector and the residual signal, a method of further reducing the amount of data to be encoded is used by using the residual signal on the residual domain calculated through motion compensation for the residual picture as a basis.

Also, for convenience of description, the current picture is F, the reference picture is Fr, the predictive picture is P, the residual picture for the current picture is F res , the residual picture for the reference picture is Fr res , and the residual picture is a residual picture for the predicted picture. The predictive picture is represented by Pres . The motion vector is represented by MV, the motion vector on the residual domain by MV res , the residual signal by R, and the residual signal by the residual domain by R res . In addition, prime (') will be used when distinguishing and displaying a decoded and reconstructed picture after encoding.

2 is a block diagram of a video encoding apparatus according to an embodiment of the present invention. Referring to FIG. 2, the video encoding apparatus 100 may include a first difference unit 105, a second difference unit 107, a motion estimation unit 110, a motion compensator 120, and a frame storage unit 130. ), An encoding unit 140, an inverse quantization unit 150, an inverse transform unit 155, an adder 160, a first loop filter unit 170, and a second loop filter unit 180. The encoder 140 includes a transformer 141, a quantizer 143, and an entropy encoder 145.

The motion estimator 110 compares the reconstructed reference picture F r ′ stored in the frame storage 130 with the current picture F to calculate a motion vector MV. That is, by referring to a predetermined block in the reconstructed reference picture F r ′ stored in the frame storage unit 130 during the encoding of the previous picture, the motion of the predetermined block in the current picture F is estimated, ) Is calculated.

The motion compensator 120 calculates a predictive picture P by motion compensating the reconstructed reference picture F r ′ using the motion vector MV calculated by the motion estimator 110. The difference unit 105 calculates a residual signal R by differentiating the predicted picture P and the current picture F calculated by the motion compensator 120. Represents a residual signal (R) in units of frames is the current residual picture (F res) of the picture.

The frame storage unit 130 stores the reconstructed reference picture Fr 'and the residual picture Fr res ' for the reference picture for use in predicting a subsequent picture.

The case of using the residual domain motion compensation on used in the present invention, the motion estimation unit 110 compares the remaining picture (F res) of the residual picture (Fr res) and the current picture to the reference pictures, on the residual domain Calculate the motion vector (MV res ). The motion compensator 120 performs motion compensation on the residual picture Fr res for the reference picture by using the motion vector MV res on the residual domain calculated by the motion estimator 110, and then predicts the residual predicted picture P res . To calculate.

In addition, the second divider 107 differentiates the residual prediction picture P res calculated by the motion compensator 120 from the residual picture F res of the current picture, and then extracts the residual signal R res on the residual domain. Calculate.

The encoder 140 calculates the residual signal R calculated by the difference unit 105, or the residual signal R res calculated by the motion estimation unit 110 when the motion compensation on the residual domain is used. The motion vector MV, the motion vector MV res on the residual domain, and the like are encoded. In detail, the encoder 141 converts the video data in the spatial domain into data in the frequency domain in the encoder 140. The transform unit 141 converts the video data in the spatial domain into the data in the frequency domain using various techniques such as discrete cosine transform (DCT), wavelet transform, Hadamard transform, and integer DCT transform. can do.

The quantizer 143 quantizes the data of the frequency domain transformed by the changer 141. Quantization may be performed by various techniques such as scalar quantization, vector quantization, adaptive quantization, non-adaptive quantization, and the like.

The entropy coding unit 145 not only outputs the quantization unit 143 but also compresses additional information such as other motion vectors. Entropy coding techniques include Huffman coding, run length coding, LZ coding, dictionary coding, exponential golem coding (Exp-Golomb), adaptive arithmetic coding (CABAC), adaptive differential length coding (CAVLC), etc. It can be implemented in various ways. The entropy encoder 145 may use different coding techniques for different types of information such as DC coefficients, AC coefficients, and other types of additional information, and may select from among a plurality of code tables within a specific coding technique. .

Meanwhile, inverse quantization and inverse transformation are performed through the inverse quantization unit 150 and the inverse transform unit 155 for motion estimation and compensation for a subsequent picture. After the inverse transformation is performed through the inverse quantization unit 150 and the inverse transform unit 155, the added picture reconstructed by the predictor picture in the adder 160 is stored in the frame storage unit 130 as a reference picture. In order to adaptively smooth the discontinuity in the block of the reconstructed picture, the second loop filter unit 180 may be disposed between the adder 160 and the frame storage unit 130.

In addition, the residual picture 157 is generated through the inverse quantization unit 150 and the inverse transform unit 155. In order to adaptively smooth the discontinuity in the block of the reconstructed residual picture, the first loop filter unit 170 may be disposed between the inverse transform unit 155 and the frame storage unit 130.

Each of the units may perform operations in units of blocks of various sizes such as 16 × 16, 8 × 8, 8 × 4, 4 × 8, and 4 × 4.

3 is a flowchart provided to explain a video encoding method in a video encoding apparatus according to an embodiment of the present invention. Referring to FIG. 3, first, a residual picture Fr res of a reference picture reconstructed in the previous step is generated and stored in the frame storage 130 (S200). The residual picture Fr res ' of the reconstructed reference picture is generated during the encoding process for the reference picture F r and stored in the frame storage unit 130. That is, in the encoding process for the reference picture Fr, the residual picture Fr res for the reference picture generated through the difference unit 105 is converted into a transform unit 141, a quantizer 143, and an inverse quantizer 150. ), The inverse transform unit 155 and the first loop filter unit 170 are reconstructed and stored in the frame storage unit 130.

Next, it generates a residual picture (F res) of the current picture (S205). Similarly, the residual picture (F res) is a transformer 141 residual picture (F res) of the current picture is calculated through a difference calculator 105, a quantization unit 143, an inverse quantization unit 150, for the current picture The reconstructed by the inverse transform unit 155 and the first loop filter unit 170 is stored in the frame storage unit 130.

In a next step, the motion estimation unit 110 refers to the residual picture Fr res for the reference picture, and thus, a motion vector for the residual picture F res for the current picture, that is, a motion vector MV res on the residual domain. To calculate (S220). The motion compensator 120 performs motion compensation on the residual picture Fr res for the reference picture by using the calculated motion vector MV res on the residual domain to generate a residual prediction picture P res (S230). In operation S240, the second divider 107 generates a difference signal between the residual prediction picture P res and the residual picture F res for the current picture, that is, the residual picture F res ′ on the residual domain (S240). . The encoder 140 generates a bitstream including the residual signal R res on the generated residual domain and additional information such as a prediction mode, a quantization parameter, and a motion vector (S250).

By this process, the amount of data to be encoded can be reduced by using the residual signal R res on the residual domain, which further reduces temporal redundancy.

4 is a diagram referred to for describing a video encoding method according to an embodiment of the present invention. 4A illustrates the reference picture 300 and FIG. 4B illustrates the current picture 310. 4C shows the residual picture 320 for the reference picture, and FIG. 4D shows the residual picture 330 for the current picture.

Referring to FIG. 4, a motion vector may be calculated by comparing the macro block A 315 of the current picture 310 with the macro block refA 305 of the reference picture 300. In addition, the residual signal resA for the macroblock A 315 may be calculated by the difference between the macroblock refA 305 and the macroblock A 315.

Similarly, the motion vector on the residual domain may be calculated by comparing the macroblock resA 335 of the residual picture 330 of the current picture with the macroblock ref_resA 325 of the residual picture 320 with respect to the reference picture. In addition, the residual signal res A 'on the residual domain may be calculated by the difference between the macroblock ref_resA 325 and the macroblock resA 335.

Therefore, the residual signal res A 'on the residual domain may be represented as follows.

Figure 112007059598579-PAT00001

5 is a block diagram of a video decoding apparatus according to an embodiment of the present invention. Referring to FIG. 5, the video decoding apparatus 400 includes a decoder 410, a motion compensator 420, a frame storage 430, a loop filter 440, a first adder 445, and And a second adder 447. The decoder 410 includes an entropy decoder 411, an inverse quantizer 413, and an inverse transformer 415.

In the decoder 410, the entropy decoder 411 decodes the entropy-coded data as the inverse of the entropy encoding performed by the encoding apparatus. That is, the entropy coded data such as the residual signal and additional information such as a motion vector is decoded. Entropy decoding can be implemented as a variety of techniques, such as in the case of entropy encoding, using different decoding techniques for different types of information, such as DC coefficients, AC coefficients, other kinds of side information, and the like within specific decoding techniques. You can choose from a number of code tables at.

The dequantization unit 413 dequantizes the entropy decoded data. In other words, the entropy coded residual signal or the residual signal on the residual domain is inversely quantized. Inverse quantization may be performed by various techniques such as scalar inverse quantization, vector inverse quantization, adaptive inverse quantization, non-adaptive inverse quantization, and the like.

The inverse transformer 415 converts the quantized frequency domain data into spatial domain video data. That is, the inverse quantized residual signal is inversely transformed to obtain a residual signal R. When motion compensation on the residual domain is used, a residual signal R res on the residual domain is calculated by inversely converting the residual signal on the inverse quantized domain. The inverse transform unit 415 may convert the frequency domain data into the video data of the spatial domain by using the inverse transform of the various transformation techniques described above.

The frame storage unit 430 stores a previous reconstructed reference picture Fr 'and a residual picture Fr res ' of the reference picture for use as a reference picture.

The motion compensator 420 calculates the predictive picture P by motion compensating the reconstructed reference picture Fr 'based on the motion vector MV decoded by the entropy decoder 411. The first adder 445 synthesizes the predicted picture P calculated by the motion compensator 420 and the decoded residual signal to generate a current picture F. FIG. The decoded picture generated by the first adder 445 is stored in the frame storage 430 to be used for decoding the next picture.

When motion compensation on the residual domain is used, the motion compensator 420 motion-compensates the residual picture Fr res of the reference picture by using the motion vector MV res on the residual domain to obtain the residual prediction picture P res . Create The first adder 445 generates a residual picture F res of the current picture by summing up the residual prediction picture P res and the residual signal R res on the decoded residual domain. A second adder 447 by summing the predicted picture (P) is calculated from the residual picture (F res), the motion compensation unit 420 to the current picture to generate a current picture.

In order to adaptively smooth the discontinuity in the block of the decoded picture, the loop filter unit 440 may be disposed between the first adder 445 and the frame storage unit 430.

Each unit may be performed in various block units such as 16 × 16, 8 × 8, 8 × 4, 4 × 8, and 4 × 4.

6 is a flowchart provided to explain an encoding method in a video decoding apparatus according to an embodiment of the present invention. Referring to FIG. 6, when the video decoding apparatus receives a compressed bitstream through a network abstraction layer (NAL) (S500), the motion compensator 420 may generate a motion vector (MV res ) on the residual domain extracted from the bitstream. In operation S510, motion residual compensation of the residual picture Fr res of the reference picture is performed to generate a residual prediction picture P res . The first adder 445 generates a residual picture (F res) of the current picture by using a residual signal (R res), on the residual prediction picture (P res) and the residual domain (S520). The motion compensator 420 generates a predictive picture P by motion compensating the reference picture Fr using the motion vector MV (S530). The second adder 447 generates the current picture F by summing up the predictive picture P and the residual picture Fr res of the current picture (S540).

By this process, the current picture F may be generated using the residual signal R res on the residual domain.

7 and 8 are views referred to for describing a smoothing method used to reduce blocking artifacts in the video encoding and decoding method according to the present invention. FIG. 7A illustrates a residual picture 600 and FIG. 7B illustrates a block 610 of the residual picture.

As illustrated in FIG. 7, in the encoding process or the decoding process, blocking artifacts due to quantization errors may be included in generating a residual picture. In order to reduce such blocking art artifacts, as shown in FIG. 8, it is necessary to perform a smoothing process in the boundary region of each block when generating the residual picture.

First, the vertical smoothing process may be performed by the following equation.

Figure 112007059598579-PAT00002

As shown in Equation 2, the pixel value of the boundary region is converted into a new value with reference to the adjacent pixel value. Similarly, the smoothing process in the horizontal direction may be performed by the following equation.

Figure 112007059598579-PAT00003

Such a smoothing method may be performed by each loop filter unit of the encoding apparatus and the decoding apparatus.

Meanwhile, to indicate whether motion compensation on the residual domain is used, the following flag may be inserted into the bitstream generated during the encoding process.

First, at the slice level in the video sequence, if use_MC_in_res_domain_flag is set in the slice header, this indicates that the current slice uses motion compensation on the remaining domain. In this case, the current picture F is generated by using the residual signal R res on the residual domain.

If use_MC_in_res_domain_flag is not set, this indicates that motion compensation is not used on the remaining domain. In this case, the current picture F is generated by using the general residual signal R.

Therefore, in the decoding process, it may be known whether motion compensation on the remaining domain is used by referring to use_MC_in_res_domain_flag included in the slice head.

In addition, at the macroblock level in the video sequence, if residual_pred_flag is set in the MB layer, it indicates that the current macroblock uses motion compensation on the residual domain. If residual_pred_flag is not set, this indicates that motion compensation is not used on the residual domain.

Using such a flag, it is possible to know whether motion compensation on the residual domain is used in the decoding process, and thus it is possible to adaptively decode video data encoded corresponding thereto.

9 is a diagram provided to explain a reference index assigned to a hatched residual picture. In the decoding process for constructing a reference picture list or the decoding process for generating a reference picture with respect to the encoded residual picture, as shown in FIG. 9, the encoded residual pictures 702, 712, and 722. , 732, 742 may be coupled to the corresponding pictures 700, 710, 720, 730, and 740, respectively. That is, the same reference indexes as the pictures 700, 710, 720, 730, and 740 decoded by the general method are assigned to the respective encoded residual pictures 702, 712, 722, 732, and 742, so that the same picture order count is obtained. ).

The present invention can also be embodied as processor readable code on a processor readable recording medium. The processor-readable recording medium includes all kinds of recording devices that store data that can be read by a computer system. Examples of a processor-readable recording medium include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like, and also include a carrier wave such as transmission over the Internet. The processor-readable recording medium can also be distributed over network coupled computer systems so that the processor-readable code is stored and executed in a distributed fashion.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

1 is a diagram illustrating an example of a residual picture;

2 is a block diagram of a video encoding apparatus according to an embodiment of the present invention;

3 is a flowchart provided to explain a video encoding method in a video encoding apparatus according to an embodiment of the present invention;

4 is a diagram referred to for describing a video encoding method according to an embodiment of the present invention;

5 is a block diagram of a video decoding apparatus according to an embodiment of the present invention;

6 is a flowchart provided to explain a video decoding method in a video decoding apparatus according to an embodiment of the present invention;

8 and 9 are views referred to in the description of a smoothing method for reducing blocking artifacts, and

FIG. 9 is a diagram provided to explain a reference index allocated to an encoded residual picture. FIG.

Explanation of symbols on the main parts of the drawings

110: motion estimation unit 120: motion compensation unit

130: frame storage unit 140: encoder

150: inverse quantization unit 155: inverse transform unit

Claims (13)

Motion compensating the residual picture for the reference picture to generate a residual prediction picture; Generating a residual picture for the current picture based on the residual prediction picture and the residual signal on the residual domain, which is a signal based on a difference between the residual prediction picture and the residual picture for the current picture; Motion compensating the reference picture to generate a predictive picture; And Generating a current picture based on the predicted picture and the residual picture for the current picture. The method of claim 1, Reconstructing a bitstream of the received video signal to generate a motion vector used for motion compensation of the residual picture for the reference picture and the residual picture for the current picture, and a residual signal on the residual domain, respectively. Video decoding method comprising a. The method of claim 1, And performing deblocking filtering on generation of the residual picture for the reference picture and the residual picture for the current picture. Generating a residual picture for the reference picture; Generating a residual picture for the current picture; Calculating a motion vector of the residual picture with respect to the current picture by referring to the residual picture with respect to the reference picture; And Generating a residual prediction picture by motion compensating the residual picture for the reference picture based on the motion vector, and generating a signal based on a difference between the residual prediction picture and the residual picture for the current picture; Video encoding method. The method of claim 4, wherein And generating a bitstream including the encoded data of the signal. The method of claim 4, wherein The residual picture for the reference picture is generated based on a difference between the predictive picture for the reference picture and the reference picture. The method of claim 4, wherein The residual picture for the current picture is generated based on a difference between the predictive picture for the current picture and the current picture. A motion compensation unit configured to generate a residual prediction picture by motion compensation of the residual picture with respect to the reference picture, and to generate a prediction picture by motion compensation of the reference picture; A first adder for generating a residual picture for the current picture based on the sum of the residual prediction picture and the residual signal on the residual domain; A second adder for generating a current picture based on the sum of the prediction picture and the residual picture for the current picture; And And a decoder configured to reconstruct a bitstream of the received video signal to generate a motion vector used for motion compensation of the residual picture for the reference picture and the residual picture for the current picture, and a residual signal on the residual domain. And a video decoding apparatus. A motion estimation unit for calculating a motion vector of the residual picture with respect to the current picture with reference to the residual picture with respect to the reference picture; A motion compensator for generating a residual predicted picture by motion compensation using the motion vector on the residual picture with respect to the reference picture; A difference generator for generating a signal based on the difference between the residual prediction picture and the residual picture for the current picture; And And an encoder configured to generate a bitstream including data obtained by encoding the signal generated by the difference unit. In the decryption process, Receiving and processing a flag indicating whether to use motion compensation on the residual domain at a predetermined syntax level in the video sequence; Receiving and processing a motion vector and a residual signal on a residual domain in the video sequence when the flag is activated; And Generating a residual prediction picture by motion compensating the residual picture for the reference picture based on the motion vector, and generating a residual picture for the current picture based on the residual prediction picture and the residual signal on the residual domain. And a video decoding method. In the encoding process, Signaling a flag indicating whether to use motion compensation on the residual domain at a predetermined syntax level in the video sequence; And A motion vector for generating a residual prediction picture by motion compensating the residual picture for a reference picture when the flag is activated; Signaling a signal for generating a residual picture for a current picture from the residual prediction picture; And a video encoding method. A processor-readable recording medium having recorded thereon a program for executing the decoding method of claim 1. A processor-readable recording medium having recorded thereon a program for executing the encoding method of claim 4.
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