KR20170113724A - Cabac encoding method and apparatus using adaptive initialization for context model, and cabac decoding method and apparatus - Google Patents

Cabac encoding method and apparatus using adaptive initialization for context model, and cabac decoding method and apparatus Download PDF

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KR20170113724A
KR20170113724A KR1020160035090A KR20160035090A KR20170113724A KR 20170113724 A KR20170113724 A KR 20170113724A KR 1020160035090 A KR1020160035090 A KR 1020160035090A KR 20160035090 A KR20160035090 A KR 20160035090A KR 20170113724 A KR20170113724 A KR 20170113724A
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cabac context
context model
cabac
adaptive initialization
initialization
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KR1020160035090A
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Korean (ko)
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안용조
심동규
류호찬
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인텔렉추얼디스커버리 주식회사
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Priority to KR1020160035090A priority Critical patent/KR20170113724A/en
Priority claimed from CN201780029821.XA external-priority patent/CN109155847A/en
Publication of KR20170113724A publication Critical patent/KR20170113724A/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/13Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/40Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code
    • H03M7/4006Conversion to or from arithmetic code
    • H03M7/4012Binary arithmetic codes
    • H03M7/4018Context adapative binary arithmetic codes [CABAC]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/103Selection of coding mode or of prediction mode
    • H04N19/107Selection of coding mode or of prediction mode between spatial and temporal predictive coding, e.g. picture refresh
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/186Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a colour or a chrominance component
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/625Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding using discrete cosine transform [DCT]

Abstract

The present invention relates to a method and apparatus for initializing a context model of context-based adaptive binary arithmetic coding (CABAC) among video compression techniques.

Description

Field of the Invention [0001] The present invention relates to a CABAC encoding method and apparatus using adaptive initialization of a context model, and a CABAC decoding method and apparatus using CABAC encoding and adaptive initialization,

The present invention relates to an image processing technique, and more particularly, to a method and apparatus for initializing a context-based adaptive binary arithmetic coding (CABAC) context model in a video compression technique.

Recently, as the demand for high definition and high definition video increases, there is a need for a high efficiency video compression technology for next generation video service. Based on this need, MPEG and VCEG, which jointly standardized the H.264 / AVC video compression standard, formed Joint Collaborative Team on Video Coding (JCT-VC) to standardize the latest international video compression standard HEVC .

In video compression technology, CABAC is an algorithm used for video compression such as H.264 / AVC, HEVC, and is a method of performing binary arithmetic coding using previously added / decoded statistical information. The context is a collection environment of statistical information defined by previously coded / decoded symbols to improve the prediction performance of the probability of symbols. The compression rate of CABAC is affected by the context modeling method, and the coding performance improves as the probability of MPS (Most Probable Symbol) increases. In addition, the encoding performance depends on the initial probability value determined in the context model initialization that determines the initial probability value of each context. That is, the method and apparatus for setting the initial value of the context model to improve the CABAC encoding performance have a major influence.

It is an object of the present invention to provide a method and an apparatus for improving the coding efficiency of an existing video compression technique that fixedly initializes a context model of CABAC.

It is to be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may exist.

According to an aspect of the present invention, there is provided a video encoding apparatus and method, and a decoding apparatus and method therefor, including a CABAC context model adaptive initialization performance acquisition unit for acquiring adaptive initialization information on a CABAC context model, A CABAC context model adaptive initialization performing determination unit for determining whether to perform adaptive initialization of the CABAC context model using the adaptive initialization information of the context model, A CABAC context initial value load unit for loading a CABAC context initial value according to QP according to whether the adaptive initialization of the CABAC context model is performed and a CABAC context initial value load unit for loading the obtained CABAC context initial value according to QP, To use the CABAC context model And a CABAC context model initialization unit for initializing the CABAC context model.

According to an aspect of the present invention, there is provided a video decoding apparatus and method for performing adaptive initialization of a CABAC context model for extracting information on whether to perform adaptive initialization of a CABAC context model with respect to a bitstream to be decoded, A CABAC context state load unit for loading a reference CABAC context state when adaptive initialization use information of the extracted CABAC context model indicates adaptive initialization use of the CABAC context model, And a CABAC context model initialization unit for initializing the CABAC context model using the CABAC context model.

According to an aspect of the present invention, there is provided a video decoding apparatus and method for performing adaptive initialization of a CABAC context model for extracting information on whether to perform adaptive initialization of a CABAC context model with respect to a bitstream to be decoded, If the adaptive initialization use information of the extracted CABAC context model does not indicate the adaptive initialization use of the CABAC context model, the CABAC context initial value load according to the QP that loads the CABAC context initial value according to the QP And a CABAC context model initialization unit for initializing the CABAC context model using the obtained CABAC context.

According to an aspect of the present invention, there is provided a video encoding apparatus and method for performing adaptive initialization of a CABAC context model for encoding adaptive initialization information of a CABAC context model to a current bitstream, A CABAC context state storage unit for storing a reference CABAC context state when the adaptive initialization use information of the encoded CABAC context model indicates adaptive initialization use of the CABAC context model; And a CABAC context model initialization unit for initializing the CABAC context model using the obtained CABAC context.

According to an aspect of the present invention, there is provided a video encoding apparatus and method for performing adaptive initialization of a CABAC context model for encoding adaptive initialization information of a CABAC context model to a current bitstream, If the adaptive initialization use information of the encoded CABAC context model does not mean adaptive initialization use of the CABAC context model, the CABAC context initial value according to the QP for loading the CABAC context initial value according to the QP And a CABAC context model initialization unit for initializing the CABAC context model using the obtained CABAC context.

According to an aspect of the present invention, there is provided a video decoding apparatus and method, including: a CABAC context model for each degradation unit for extracting adaptive initialization information of a CABAC context model for each parallelization unit with respect to a bitstream to be decoded; An adaptive initialization execution unit for determining whether to perform adaptive initialization of the CABAC context model for each parallelization unit using adaptive initialization information of the CABAC context model for each parallelization unit, A reference CABAC context state load unit for loading a corresponding reference CABAC context state according to whether the adaptive initialization of the CABAC context model for each parallelization unit is performed, whether or not to perform adaptive initialization of the CABAC context model for each parallelization unit, Therefore, CABAC Text includes CABAC context initial value loading unit according to the QP to load the initial value, and the parts of the obtained used to initialize parallelism CABAC context model parallelism CABAC context model per unit to initialize the unit by a CABAC context.

According to an aspect of the present invention, there is provided a video encoding apparatus and method, including: a CABAC context-by-parallelization unit that encodes adaptive initialization information of a CABAC context model for each parallelization unit into a flag type, Adaptive initialization of the model, adaptation of the CABAC context model for each parallelization unit to determine whether to perform adaptive initialization of the CABAC context model for each parallelization unit using the adaptive initialization information of the CABAC context model for each parallelization unit A reference CABAC context state storage unit for storing a reference CABAC context state corresponding to whether the adaptive initialization of the CABAC context model for each parallelization unit is performed, a CABAC context state storage unit for each parallelization unit, Loading A CABAC context initial value load unit for loading a CABAC context initial value according to the QP according to whether the adaptive initialization of the CABAC context model for each parallelization unit is performed according to the parallelization unit, And a CABAC context model initialization unit for each serialization unit that initializes the CABAC context model for each parallelization unit using the CABAC context.

It is an object of the present invention to provide a method and an apparatus for initializing a context model initialization of a CABAC according to a QP used in an existing video compression technique with reference to a state value of a CABAC context model stored in a coding process do.

According to an embodiment of the present invention, the state value of the CABAC context model stored in the encoding process of the previous picture in the encoding order or the reference picture using the same QP is set as the initial value of the CABAC context model of the current picture to be encoded, Can be improved.

According to an embodiment of the present invention, when a single picture is divided using a parallelization tool, in a process of initializing a CABAC context model for each parallelization unit, a parallelization unit at a corresponding position in a coding order, or a reference parallelization The state value of the CABAC context model stored in the unit can be set as the initial value of the CABAC context model of the parallelization unit to be encoded at present, thereby improving the performance of the encoding.

1 is a block diagram showing a configuration of a video encoding apparatus according to an embodiment of the present invention.
2 is a block diagram illustrating a configuration of a video decoding apparatus according to an embodiment of the present invention.
FIG. 3 is a block diagram illustrating a procedure for determining whether to initialize an adaptive CABAC context model according to an embodiment of the present invention and performing a CABAC context model initialization.
4 is a table showing an example of a syntax for transmitting whether to initialize an adaptive CABAC context model according to an embodiment of the present invention.
FIG. 5 is a conceptual diagram illustrating an exemplary implementation of an adaptive CABAC context model initialization according to an embodiment of the present invention.
6 is a table showing an example of a syntax for transmitting whether or not to initialize an adaptive CABAC context model for each parallelization unit according to an embodiment of the present invention.
FIG. 7 is a conceptual diagram illustrating an example of performing an initialization of an adaptive CABAC context model for each parallelization unit according to an embodiment of the present invention.
FIG. 8 is a conceptual diagram illustrating an example of performing initialization of a CABAC context model for each parallelization unit in conventional video encoding according to an embodiment of the present invention.
FIG. 9 is a conceptual diagram illustrating an example of the CABAC context model initialization according to the application of the parallelization tool according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings attached hereto, so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout this specification, when a part is referred to as being 'connected' to another part, it includes not only a case where it is directly connected but also a case where the part is electrically connected with another part in between.

In addition, when an element is referred to as being "comprising" an element throughout the specification, it is understood that the element may include other elements, but not other elements, unless specifically stated otherwise.

The term (or step) or step of (~) used in the present specification does not imply a step for.

Also, the terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

In addition, the components shown in the embodiments of the present invention are shown independently to represent different characteristic functions, which does not mean that each component is composed of separate hardware or software constituent units. That is, each constituent unit is described by arranging each constituent unit for convenience of explanation, and at least two constituent units of each constituent unit may be combined to form one constituent unit or one constituent unit may be divided into a plurality of constituent units to perform a function. The integrated embodiments and the separate embodiments of each of these components are also included in the scope of the present invention without departing from the essence of the present invention.

In the various embodiments of the present invention described herein, the 'parallelization unit' refers to a coding and decoding unit in which one coding and decoding unit is divided for parallel processing in the video coding and decoding step, and one coding and decoding unit A plurality of encoding and decoding units for dividing a decoding unit can be collectively referred to.

Hereinafter, a CABAC encoding method and apparatus using adaptive initialization of the proposed context model according to an embodiment of the present invention, and a CABAC decoding method and apparatus will be described in detail with reference to FIG.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram illustrating a video encoding method and apparatus according to an embodiment of the present invention.

The video encoding method and apparatus according to one embodiment includes an inter picture prediction unit 120, an intra picture prediction unit 125, a subtraction unit 130, a transform unit 140, a quantization unit 150, an entropy encoding unit 160 An inverse transform unit 145, an inverse quantization unit 155, an adding unit 135, an in-loop filter unit 180, and a reconstruction picture buffer 190.

The inter-picture prediction unit 120 performs motion prediction using the reconstructed image stored in the input image 110 and the reconstructed picture buffer 190 to generate a prediction signal.

The intra prediction unit 125 performs spatial prediction using the pixel values of neighboring neighboring blocks that are adjacent to the current block to be encoded, thereby generating a prediction signal.

The subtractor 130 generates a residual signal using the input image and the prediction signal generated through the inter-picture predicting unit 120 or the intra-picture predicting unit 125.

The conversion unit 140 and the quantization unit 150 convert and quantize the residual signal generated through the subtraction unit 130 to generate a quantized coefficient.

The entropy encoding unit 160 performs entropy encoding on the encoding information such as syntax elements and quantized coefficients defined in the video encoder and outputs the bitstream.

The inverse transform unit 145 and the inverse quantization unit 155 receive the quantized coefficients, perform inverse quantization and inverse transformation in order, and generate a reconstructed residual signal.

The adder 135 generates a reconstructed signal using the predictive signal generated through the inter-picture predicting unit 120 or the intra-picture predictor 125 and the reconstructed residual signal.

The restored signal is transmitted to the in-loop filter unit 180. The restored picture to which the filtering is applied is stored in the restored picture buffer 190, and can be used as a reference picture in the inter-picture predicting unit 120.

2 is a block diagram showing the configuration of a video decoding apparatus and method according to an embodiment of the present invention.

The video decoding apparatus and method according to one embodiment includes an entropy decoding unit 210, an inverse quantization unit 220, an inverse transform unit 230, an intra prediction unit 240, an inter prediction unit 250, 260, an in-loop filter unit 270, and a reconstruction picture buffer 280.

The entropy decoding unit 210 decodes the input bitstream 200 and outputs decoded information such as syntax elements and quantized coefficients.

The inverse quantization unit 220 and the inverse transformation unit 230 receive the quantization coefficient, perform inverse quantization and inverse transformation in order, and output a residual signal.

The intra prediction unit 240 generates a prediction signal by performing spatial prediction using the pixel values of the neighboring decoded neighboring blocks adjacent to the current block to be decoded.

The inter-picture prediction unit 250 performs motion compensation using a motion vector extracted from the bit stream and a reconstructed picture stored in the reconstruction picture buffer 280 to generate a prediction signal.

The prediction signals output from the intra prediction unit 240 and the intra prediction unit 250 are summed with the residual signal through the adder 260 and the reconstructed signal generated on a block-by-block basis includes the reconstructed image .

The reconstructed image is transferred to the in-loop filter unit 270. The restored picture to which the filtering is applied is stored in the restored picture buffer 280, and can be used as a reference picture in the inter-picture predicting unit 250.

FIG. 3 is a block diagram illustrating a procedure for determining whether to initialize an adaptive CABAC context model according to an embodiment of the present invention and performing a CABAC context model initialization.

The CABAC encoding method and apparatus using adaptive initialization of the context model according to an embodiment, and the CABAC decoding method and apparatus include an adaptive CABAC context initialization determiner 320 for initializing a CABAC context model, a reference CABAC context initialization determining unit 320, Unit 330, a CABAC context initial value load unit 340 according to the QP, and a CABAC context initialization unit 350.

The adaptive CABAC context initialization determiner 320 receives the adaptive CABAC context initialization use information and determines whether to use the adaptive CABAC context initialization. The adaptive CABAC context initialization enablement information may be signaled in at least one high-level syntax.

The adaptive CABAC context initialization use information according to an embodiment determines whether to use the adaptive CABAC context initialization proposed in the present invention in initializing the CABAC context, And a specific index form for specifying the state information. If the adaptive CABAC context initialization is performed according to whether or not the adaptive CABAC context initialization is performed, the reference CABAC context state load unit 330 may load the reference CABAC context state to perform the initialization of the CABAC context . If the adaptive CABAC context initialization is not performed, the CABAC context initial value stored in the table according to the QP is loaded through the CABAC context initial value load unit 340 according to the QP to initialize the CABAC context.

The reference CABAC context state load unit 330 loads the CABAC context state stored in the previous decoding step to initialize the CABAC context.

The CABAC context state stored in the previous decoding step according to an embodiment implies a CABAC context state referred to for initializing the adaptive CABAC context proposed in the present invention. The CABAC context state referred to above refers to a CABAC context state stored at a specific location of a picture that has already been decoded according to a decoding order. Or a CABAC context state stored at a specific position of a corresponding parallelization unit in a decoded picture if the picture is divided into a parallelization unit (e.g., slice, tile, etc.).

In a case where a picture is divided in parallel units according to an exemplary embodiment, the location of the CABAC context state referred to for the initialization of the adaptive CABAC context proposed in the present invention is a location in which the size and number of parallelization units are the same, Quot; refers to a specific location within a parallelization unit. On the other hand, when the size and the number of the parallelization units are not the same, based on the position information on the stored CABAC context state in the decoded picture, state information of a position closest to the parallelization unit that divides the current picture is selected .

In a case where a picture is divided by a parallelization unit according to an embodiment, when the size and the number of the parallelization units are not the same, a parallelization process of dividing a current picture based on position information on a stored CABAC context state in a decoded picture And using the CABAC context state stored in the parallelization unit in the already decoded picture with the largest area / size when matched with the unit.

4 is a table showing an example of a syntax for transmitting whether to initialize an adaptive CABAC context model according to an embodiment of the present invention.

A CABAC encoding method and apparatus using adaptive initialization of a context model according to an exemplary embodiment, and a CABAC decoding method and apparatus include adaptive CABAC context model initialization information using a video sequence parameter set (VPS), a sequence parameter set (SPS) And a PPS (Picture Parameter Set).

FIG. 5 is a conceptual diagram illustrating an exemplary implementation of an adaptive CABAC context model initialization according to an embodiment of the present invention.

The CABAC encoding method and apparatus using the adaptive initialization of the context model according to an embodiment, and the CABAC decoding method and apparatus are previously encoded or decoded to perform the initialization of the adaptive CABAC context model, (Step 530) of referring to the stored CABAC context state at a specific location of the current picture 520, and a CABAC context initialization process of the current picture 520 to be currently encoded or decoded.

In the process of initializing the adaptive CABAC context model according to an embodiment, the specific location of the reference picture 510 refers to the absolute position and the relative position of the coding units mutually defined in advance before the coding and decoding, The specific location information does not include transmission to the decoder.

In the process of initializing the adaptive CABAC context model according to an exemplary embodiment, the specific location of the reference picture 510 indicates an absolute position and a relative position of a coding unit designated in the coding step. In this case, Lt; / RTI >

6 is a table showing an example of a syntax for transmitting whether or not to initialize an adaptive CABAC context model for each parallelization unit according to an embodiment of the present invention.

The CABAC encoding method and apparatus using the adaptive initialization of the context model according to an embodiment, and the CABAC decoding method and apparatus include transmitting the flag indicating whether the adaptive CABAC context model is initialized for each parallelization unit.

And independently performing an initialization of an adaptive CABAC context model for each parallelization unit using a flag for performing an initialization of an adaptive CABAC context model for each parallelization unit according to an exemplary embodiment.

FIG. 7 is a conceptual diagram illustrating an example of performing an initialization of an adaptive CABAC context model for each parallelization unit according to an embodiment of the present invention.

The CABAC encoding method and apparatus using the adaptive initialization of the context model according to an embodiment and the CABAC decoding method and apparatus are previously encoded or decoded to perform initialization of the adaptive CABAC context model for each parallelization unit, (731, 732, 733, 734) referencing the stored CABAC context state at a specific location corresponding to the corresponding parallelization unit 711, 712, 713, 714 of the current picture 710 And the CABAC context initialization of the corresponding parallelization unit 721, 722, 723,

In the process of initializing the adaptive CABAC context model according to an exemplary embodiment, a specific location of each parallelization unit 711, 712, 713, and 714 of the reference picture 710 may include a pre- And in this case, the specific position information does not include transmission to the decoder.

The specific position of each parallelization unit 711, 712, 713, and 714 of the reference picture 710 in the process of performing the initialization of the adaptive CABAC context model according to an exemplary embodiment includes an absolute position of a coding unit designated in the coding step, , And in this case, includes transmitting the specific location information to the decoder.

8 and 9 are conceptual diagrams illustrating an example of performing initialization of a CABAC context model for each parallelization unit in an existing video encoding according to an embodiment of the present invention and a CABAC context model initialization according to an embodiment of the present invention 1 shows a conceptual diagram showing an example of the performance.

In the WPP (Parallel Processing) method used in conventional video encoding and decoding apparatuses and methods, CABAC context model initialization is performed for each line of encoding units 810, 820, 830, 840 and 850, The initial encoding unit performs CABAC context model initialization referring to the CABAC context state of the second encoding unit of the previous encoding line.

The CABAC encoding method and apparatus using the adaptive initialization of the context model according to an embodiment, and the CABAC decoding method and apparatus, when encoding and decoding using the WPP parallelization method, are previously encoded or decoded, A CABAC context initialization process of a line 921 of a first encoding unit of a current picture 920 to be currently encoded or decoded, .

In the process of initializing the adaptive CABAC context model according to an embodiment, the specific location of the reference picture 910 refers to the absolute position and the relative position of the coding units mutually defined in advance before performing the coding and decoding, The specific location information does not include transmission to the decoder.

In the process of initializing the adaptive CABAC context model according to an exemplary embodiment, the specific location of the reference picture 910 refers to the absolute position and the relative position of the encoding unit designated in the encoding step. In this case, Lt; / RTI >

Claims (14)

  1. A video encoding and decoding method,
    Obtaining information on whether to perform adaptive initialization of the CABAC context model;
    Determining whether to perform adaptive initialization of the CABAC context model using the adaptive initialization execution information of the CABAC context model;
    Loading a reference CABAC context state according to the adaptive initialization of the CABAC context model;
    Loading a CABAC context initial value according to QP according to whether or not adaptive initialization of the CABAC context model is performed; And
    And initializing the CABAC context model using the obtained CABAC context.
  2. The method according to claim 1,
    Extracting information on whether to perform adaptive initialization of a CABAC context model in a flag form with respect to a bitstream to be decoded;
    Loading the reference CABAC context state when adaptive initialization use information of the extracted CABAC context model indicates adaptive initialization use of the CABAC context model; And
    And initializing the CABAC context model using the obtained CABAC context.
  3. The method according to claim 1,
    Encoding the adaptive initialization information of the CABAC context model into a flag type for the current bitstream;
    Storing a reference CABAC context state when adaptive initialization use information of the CABAC context model to be encoded implies adaptive initialization use of a CABAC context model;
    Loading the stored reference CABAC context state; And
    And initializing a CABAC context model using the stored CABAC context state.
  4. The method according to claim 1,
    Extracting information on whether to perform adaptive initialization of a CABAC context model in a flag form with respect to a bitstream to be decoded;
    Loading the CABAC context initial value according to the QP when the adaptive initialization use information of the extracted CABAC context model does not mean adaptive initialization use of the CABAC context model; And
    And initializing the CABAC context model using the obtained CABAC context.
  5. The method according to claim 1,
    Encoding the adaptive initialization information of the CABAC context model into a flag type for the current bitstream;
    Extracting a CABAC context initial value according to the QP when the adaptive initialization use information of the CABAC context model to be encoded does not mean adaptive initialization use of the CABAC context model; And
    And initializing the CABAC context model using the extracted initial value of the CABAC context.
  6. A video decoding method comprising:
    Acquiring information on whether to perform adaptive initialization of the CABAC context model for each parallelization unit;
    Determining whether to perform adaptive initialization of the CABAC context model for each parallelization unit using the adaptive initialization execution information of the CABAC context model for each parallelization unit;
    Loading a corresponding reference CABAC context state according to whether or not adaptive initialization of the CABAC context model for each parallelization unit is performed;
    Loading a CABAC context initial value according to the QP according to whether the adaptive initialization of the CABAC context model for each parallelization unit is performed; And
    And initializing a CABAC context model for each parallelization unit using the obtained CABAC context.
  7. A video parallel encoding method comprising:
    Encoding the adaptive initialization performance information of the CABAC context model for each parallelization unit into a flag type;
    Determining whether to perform adaptive initialization of the CABAC context model for each parallelization unit using the adaptive initialization execution information of the CABAC context model for each parallelization unit;
    Storing a corresponding reference CABAC context state according to the adaptive initialization of the CABAC context model for each parallelization unit;
    Loading the stored reference parallel CABAC context state;
    Loading a CABAC context initial value according to the QP according to whether the adaptive initialization of the CABAC context model for each parallelization unit is performed; And
    And initializing a CABAC context model for each parallelization unit using the obtained CABAC context.
  8. A video encoding and decoding apparatus comprising:
    Obtaining information on whether to perform adaptive initialization of the CABAC context model;
    Determining whether to perform adaptive initialization of the CABAC context model using the adaptive initialization execution information of the CABAC context model;
    Loading a reference CABAC context state according to the adaptive initialization of the CABAC context model;
    Loading a CABAC context initial value according to QP according to whether or not adaptive initialization of the CABAC context model is performed; And
    And initializing the CABAC context model using the obtained CABAC context.
  9. 9. The method of claim 8,
    Extracting information on whether to perform adaptive initialization of a CABAC context model in a flag form with respect to a bitstream to be decoded;
    Loading the reference CABAC context state when adaptive initialization use information of the extracted CABAC context model indicates adaptive initialization use of the CABAC context model; And
    And initializing the CABAC context model using the obtained CABAC context.
  10. 9. The method of claim 8,
    Encoding the adaptive initialization information of the CABAC context model into a flag type for the current bitstream;
    Storing a reference CABAC context state when adaptive initialization use information of the CABAC context model to be encoded implies adaptive initialization use of a CABAC context model;
    Loading the stored reference CABAC context state; And
    And initializing the CABAC context model using the stored CABAC context state.
  11. 9. The method of claim 8,
    Extracting information on whether to perform adaptive initialization of a CABAC context model in a flag form with respect to a bitstream to be decoded;
    Loading the CABAC context initial value according to the QP when the adaptive initialization use information of the extracted CABAC context model does not mean adaptive initialization use of the CABAC context model; And
    And initializing the CABAC context model using the obtained CABAC context.
  12. 9. The method of claim 8,
    Encoding the adaptive initialization information of the CABAC context model into a flag type for the current bitstream;
    Extracting a CABAC context initial value according to the QP when the adaptive initialization use information of the CABAC context model to be encoded does not mean adaptive initialization use of the CABAC context model; And
    And initializing the CABAC context model using the extracted CABAC context initial value.
  13. A video decoding apparatus comprising:
    Acquiring information on whether to perform adaptive initialization of the CABAC context model for each parallelization unit;
    Determining whether to perform adaptive initialization of the CABAC context model for each parallelization unit using the adaptive initialization execution information of the CABAC context model for each parallelization unit;
    Loading a corresponding reference CABAC context state according to whether or not adaptive initialization of the CABAC context model for each parallelization unit is performed;
    Loading a CABAC context initial value according to the QP according to whether the adaptive initialization of the CABAC context model for each parallelization unit is performed; And
    And initializing a CABAC context model for each parallelization unit using the obtained CABAC context.
  14. A video parallel encoding apparatus comprising:
    Encoding the adaptive initialization performance information of the CABAC context model for each parallelization unit into a flag type;
    Determining whether to perform adaptive initialization of the CABAC context model for each parallelization unit using the adaptive initialization execution information of the CABAC context model for each parallelization unit;
    Storing a corresponding reference CABAC context state according to the adaptive initialization of the CABAC context model for each parallelization unit;
    Loading a corresponding reference CABAC context state according to whether or not adaptive initialization of the CABAC context model for each parallelization unit is performed;
    Loading a CABAC context initial value according to the QP according to whether the adaptive initialization of the CABAC context model for each parallelization unit is performed; And
    And initializing a CABAC context model for each parallelization unit using the obtained CABAC context.
KR1020160035090A 2016-03-24 2016-03-24 Cabac encoding method and apparatus using adaptive initialization for context model, and cabac decoding method and apparatus KR20170113724A (en)

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