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WO2018074617A1 - Procédé et appareil de codage vidéo utilisant une liste de modes de référence pour une prédiction intra - Google Patents

Procédé et appareil de codage vidéo utilisant une liste de modes de référence pour une prédiction intra Download PDF

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Publication number
WO2018074617A1
WO2018074617A1 PCT/KR2016/011659 KR2016011659W WO2018074617A1 WO 2018074617 A1 WO2018074617 A1 WO 2018074617A1 KR 2016011659 W KR2016011659 W KR 2016011659W WO 2018074617 A1 WO2018074617 A1 WO 2018074617A1
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Prior art keywords
intra prediction
mode
block
list
current block
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English (en)
Korean (ko)
Inventor
류호찬
안용조
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DigitalInsights Inc
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DigitalInsights Inc
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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
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods 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
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/11—Selection of coding mode or of prediction mode among a plurality of spatial predictive coding modes
    • 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
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods 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
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/105—Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
    • 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
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/157—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
    • H04N19/159—Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
    • 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
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods 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
    • H04N19/17—Methods 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 an image region, e.g. an object
    • H04N19/176—Methods 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 an image region, e.g. an object the region being a block, e.g. a macroblock
    • 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
    • H04N19/44—Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
    • 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
    • H04N19/46—Embedding additional information in the video signal during the compression process

Definitions

  • the present invention relates to an image processing technique, and more particularly, to a video coding method and apparatus for generating and using a reference mode list for intra prediction in a video compression technique.
  • intra prediction is a method of performing prediction by referring to spatially adjacent neighboring pixel information of a block currently performing encoding or decoding.
  • Intra-picture prediction includes prediction pixel generation using a combination of various directionalities and neighboring pixels, determination of an optimal intra-picture prediction mode, and the like.
  • techniques such as increasing the number of intra prediction modes or generating a prediction mode candidate for determining an optimal intra prediction mode have been studied. However, as the number of intra prediction modes increases, a mode bit increases in encoding them.
  • the present invention provides a method and apparatus for improving coding efficiency compared to a conventional video compression technique by using an intra prediction prediction direction of neighboring pixels in a reference list of intra prediction modes to improve the performance of intra prediction.
  • the purpose is to improve coding efficiency compared to a conventional video compression technique by using an intra prediction prediction direction of neighboring pixels in a reference list of intra prediction modes to improve the performance of intra prediction.
  • a video coding method and apparatus are an extractor which extracts information used for intra prediction from a bitstream, and a mode list for determining a mode used in intra prediction.
  • a generator configured to determine a function, a determiner configured to determine an intra prediction mode for a current block with reference to the generated mode list, and a component configured to configure reference samples for performing intra prediction using the determined intra prediction mode
  • an intra prediction reconstruction unit for reconstructing the block by using the configured reference samples and the obtained differential time signal.
  • a video coding method and apparatus provide an acquirer for obtaining information on whether to generate a neighboring pixel based reference mode list from a bitstream, and whether to use a reference mode list of a current block.
  • An acquisition unit that acquires intra prediction mode information on the current block among a series of mode lists including modes other than the mode configured in the reference mode list when the use of the reference mode list is false, and an intra prediction And an acquisition unit for acquiring the difference signal.
  • a video coding method and apparatus may include a generation unit for acquiring intra prediction modes of neighboring blocks of a current block and generating a reference mode list for intra prediction, in a current block.
  • a determination unit for determining whether a neighboring pixel prediction direction based reference mode list is generated, a generation unit for acquiring an intra prediction mode of a template block spatially adjacent to the current block when generation of the neighboring pixel prediction direction based reference mode list is true; and And a correction unit for modifying a reference mode list for the intra prediction of the current block by using the acquired intra prediction mode of the template block.
  • a video coding method and apparatus for generating a spatially adjacent template block of a current block, and a generator for generating reference pixels of a spatially adjacent template block of the template block.
  • a performing unit performing an intra prediction on the template block by using reference pixels of the template block and at least one intra prediction mode, and a determining unit determining an optimal intra prediction mode on the template block. do.
  • An object of the present invention is to provide an intra prediction method and apparatus for using the intra prediction prediction direction of neighboring pixels in a reference list for the intra prediction mode in order to improve the performance of intra prediction.
  • the video encoding efficiency may be improved by using the intra-prediction direction of the neighboring pixels in the reference list for the intra prediction mode.
  • An object of the present invention is to provide an intra prediction method and apparatus for using the intra prediction prediction direction of neighboring pixels in a reference list for the intra prediction mode in order to improve the performance of intra prediction.
  • the video encoding efficiency may be improved by using the intra-prediction direction of the neighboring pixels in the reference list for the intra prediction mode.
  • ⁇ to '' or ⁇ of '' does not mean a step for.
  • first and second 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.
  • each component shown in the embodiments of the present invention are shown independently to represent different characteristic functions, and do not mean that each component is composed of separate hardware or one software unit. That is, each component is described by listing each component for convenience of description, and at least two of the components may be combined to form one component, or one component may be divided into a plurality of components to perform a function. The integrated and separated embodiments of each of these components are also included within the scope of the present invention without departing from the spirit of the invention.
  • FIG. 4 is a flowchart illustrating generation of a reference mode list for intra prediction according to an embodiment of the present invention.
  • the reference mode list generator includes an intra prediction mode obtaining unit 410 of a spatially adjacent block, a neighboring pixel prediction direction based reference mode list generation unit 420, and an adjacent pixel based intra prediction mode obtaining unit. 430, and a reference mode list constructing unit 440.
  • the intra prediction mode obtaining unit 410 of the spatially adjacent block includes acquiring the intra prediction mode of the block located at the left or the top of the currently decoded block.
  • the neighboring pixel prediction direction-based reference mode list generation unit 420 may determine whether to generate the neighboring pixel prediction direction-based reference mode list obtained from the bitstream using the information on whether to generate the neighboring pixel prediction direction-based reference mode list. And determining whether to use the intra prediction mode based on the neighboring pixel prediction direction to generate the reference mode list for determining the prediction mode.
  • the neighboring pixel-based intra prediction mode obtaining unit 430 may perform an intra prediction mode to minimize prediction errors by performing intra prediction on the pixels using spatially adjacent pixels of the current decoding block. Acquire.
  • the left and upper pixels are selected as templates based on a block currently decoded, and intra prediction is performed using adjacent pixels of the template.
  • one or more modes for minimizing the prediction error in the intra prediction operation on the template are selected to determine the intra prediction mode based on the surrounding pixels.
  • the reference mode list constructing unit 440 may be configured to include an intra prediction mode obtaining unit 410 and an intra pixel based intra prediction mode obtaining unit 430 of the spatially adjacent block.
  • the prediction modes are organized into one reference mode list.
  • the reference mode list constructing unit 440 includes eliminating redundant intra prediction modes in constructing the single reference mode list.
  • ⁇ to '' or ⁇ of '' does not mean a step for.
  • first and second 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.
  • each component shown in the embodiments of the present invention are shown independently to represent different characteristic functions, and do not mean that each component is composed of separate hardware or one software unit. That is, each component is described by listing each component for convenience of description, and at least two of the components may be combined to form one component, or one component may be divided into a plurality of components to perform a function. The integrated and separated embodiments of each of these components are also included within the scope of the present invention without departing from the spirit of the invention.
  • FIG. 1 is a block diagram illustrating a configuration of a video encoding method and apparatus according to an embodiment of the present invention.
  • the video encoding method and apparatus may include an inter prediction unit 120, an intra prediction unit 125, a subtraction unit 130, a transform unit 140, a quantization unit 150, and an entropy encoding unit 160. ), An inverse transform unit 145, an inverse quantization unit 155, an adder 135, an in-loop filter unit 180, and a reconstructed picture buffer 190.
  • the inter prediction unit 120 generates a prediction signal by performing motion prediction using the reconstructed image stored in the input image 110 and the reconstructed picture buffer 190.
  • the intra prediction unit 125 generates a prediction signal by performing spatial prediction using pixel values of pre-restored neighboring blocks adjacent to the current block to be encoded.
  • the subtractor 130 generates a residual signal using the prediction signal generated by the input image and the inter-prediction unit 120 or the intra prediction unit 125.
  • the transformer 140 and the quantizer 150 generate quantized coefficients by performing transform and quantization on the residual signal generated by the subtractor 130.
  • the entropy encoder 160 outputs a bitstream by performing entropy encoding on encoding information such as syntax elements and quantized coefficients defined in the video encoder.
  • the inverse transformer 145 and the inverse quantizer 155 receive the quantization coefficients, perform inverse quantization and inverse transformation in order, and generate a reconstructed residual signal.
  • the adder 135 generates a reconstruction signal by using the prediction signal generated by the inter prediction unit 120 or the intra prediction unit 125 and the reconstructed residual signal.
  • the reconstruction signal is transmitted to the in-loop filter unit 180.
  • the reconstructed picture to which the filtering is applied is stored in the reconstructed picture buffer 190 and may be used as a reference picture in the inter prediction unit 120.
  • FIG. 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 may include an entropy decoder 210, an inverse quantizer 220, an inverse transformer 230, an intra prediction unit 240, an inter prediction unit 250, and an adder ( 260, an in-loop filter unit 270, and a reconstructed picture buffer 280.
  • the entropy decoder 210 decodes the input bitstream 200 and outputs decoding information such as syntax elements and quantized coefficients.
  • the inverse quantization unit 220 and the inverse transform unit 230 receive the quantization coefficients, 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 pixel values of the pre-decoded neighboring block adjacent to the current block to be decoded.
  • the inter prediction unit 250 generates a prediction signal by performing motion compensation using the motion vector extracted from the bitstream and the reconstructed image stored in the reconstructed picture buffer 280.
  • the prediction signals output from the intra prediction unit 240 and the intra prediction unit 250 are combined with the residual signal through the adder 260, and thus the reconstruction signal generated in units of blocks includes a reconstructed image. .
  • the reconstructed image is transmitted to the in-loop filter unit 270.
  • the reconstructed picture to which the filtering is applied is stored in the reconstructed picture buffer 280 and may be used as a reference picture in the inter prediction unit 250.
  • FIG. 3 is a flowchart of intra prediction in a video decoding apparatus according to an embodiment of the present invention.
  • the intra prediction unit may include an intra prediction parser 310, a reference mode list generator 320, an intra prediction mode determiner 330, and an intra prediction prediction sample configuration unit. 340, and an intra prediction predictor 350.
  • the intra prediction parser 310 obtains information about an intra prediction mode from a bitstream.
  • the information about the intra prediction mode includes information on whether the reference mode list of the intra prediction mode of the current coding block is included.
  • the information about the intra prediction mode includes information about whether a reference mode list of the intra prediction mode is included in the current coding block, one index of the current coding block is included in the intra prediction mode list. If not included, mode information of one of the remaining modes is included.
  • the reference mode list generator 320 generates a reference mode list for determining an intra prediction mode acquired by the intra prediction parser 310.
  • the intra prediction mode information generated by using the intra prediction mode information of the spatially adjacent pixels and the intra prediction mode information of the spatially adjacent blocks of the current coding block Generating a reference mode list for prediction mode determination.
  • the intra prediction mode determiner 330 may include intra prediction mode information acquired by the intra prediction parser 310 and the reference mode list generator 320 and a reference mode list for intra prediction. Determine the intra prediction mode of the current coding block by using.
  • the reference mode list generated by the reference mode list generator 320 and the reference obtained by the intra prediction parser 310
  • the intra prediction mode of the current coding block is determined using the mode list index.
  • the intra prediction mode of the current coding block is not included in the reference mode list for the intra prediction mode, the intra prediction mode is obtained by using the intra prediction mode information acquired by the intra prediction parser 310.
  • the intra prediction reference sample configuring unit 340 configures intra prediction pictures for the current coding block using the intra prediction mode of the current coding block determined by the intra prediction mode determiner 330. do.
  • the intra-prediction reference sample configuration unit 340 includes reference pixel padding, reference pixel filtering, and the like for improving prediction performance with respect to spatially intact pixels of the current coding block.
  • the intra prediction reconstruction unit 350 combines a prediction signal and a difference signal obtained by the intra prediction prediction sample configuration unit 340 and the intra prediction prediction parser 310 to form one reconstruction block.
  • FIG. 5 illustrates an example of acquiring a prediction mode in a neighboring pixel based screen according to an embodiment of the present invention.
  • a space between a neighboring neighboring pixel template 520 and a spatially neighboring reference pixel 530 for the neighboring pixel template is determined based on the current decoding block 510. It includes performing intra prediction. As shown in FIG. 5, the spatially adjacent neighboring pixel template 520 and the spatially adjacent reference pixels 530 with respect to the neighboring pixel template based on the current decoding block 510 may be selected in an area which has already been restored. The non-reconstructed area is not included. However, pixels generated using reference sample padding, reference sample filtering, and the like for intra prediction may be included. According to an embodiment, the current decoding block 510 includes a rectangular block of MxN including a square.
  • FIG. 6 illustrates an example of generating a neighboring pixel template and a reference pixel for acquiring a prediction mode in a neighboring pixel-based screen according to an embodiment of the present invention.
  • the spatially adjacent neighboring pixel template 620 and the spatially neighboring reference pixels 630 with respect to the neighboring pixel template are determined based on the current decoding block 610.
  • the current decoding block 610 is a block having a size of M ⁇ N. If M and N are the same, the decoding block 610 is configured as a square block. Otherwise, the decoding block 610 is configured as a rectangular block.
  • the peripheral pixel template 620 is composed of blocks having sizes of Mxn1 and m1xN, and the size information of the template includes using a fixed size, and the size information m 1 and n 1 are higher level. Including acquiring through syntax. M 1 and n 1 have integer values greater than one. According to an embodiment, m 2 and n 2 , which are size information of spatially adjacent reference pixels 630 of the neighboring pixel template, are also obtained through high level syntax, and m2 and n2 are integers greater than 1. Has a value.

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Abstract

La présente invention concerne un procédé et un appareil de codage vidéo, parmi les schémas de codage vidéo, pour générer une liste de références de mode de prédiction intra afin d'améliorer l'efficacité de codage/décodage. Le procédé comprend les étapes consistant à : extraire, d'un flux binaire, de données utilisées dans une prédiction intra ; générer une liste de modes à laquelle il est fait référence pour déterminer le mode utilisé dans la prédiction intra ; déterminer le mode de prédiction intra pour le bloc actuel en se référant à la liste de modes générés ; établir des échantillons de référence, pour exécuter une prédiction intra, à l'aide du mode de prédiction intra déterminé ; et reconstituer une prédiction intra pour reconstituer le bloc à l'aide des échantillons de référence établis et le signal différentiel acquis.
PCT/KR2016/011659 2016-10-17 2016-10-18 Procédé et appareil de codage vidéo utilisant une liste de modes de référence pour une prédiction intra Ceased WO2018074617A1 (fr)

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KR10-2016-0134041 2016-10-17
KR1020160134041A KR20180041833A (ko) 2016-10-17 2016-10-17 화면 내 예측에 대한 참조 모드 리스트를 사용하는 비디오 코딩 방법 및 장치

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US20240373035A1 (en) * 2021-06-29 2024-11-07 Kt Corporation Video signal encoding/decoding method based on intra prediction in sub-block units, and recording medium for storing bit-stream

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KR20090096659A (ko) * 2008-03-09 2009-09-14 엘지전자 주식회사 비디오 신호의 인코딩 또는 디코딩에 관한 방법과 장치
KR20140098113A (ko) * 2011-11-04 2014-08-07 퀄컴 인코포레이티드 인트라 모드 비디오 코딩
KR20150115833A (ko) * 2013-02-01 2015-10-14 퀄컴 인코포레이티드 인트라 예측을 위한 모드 결정 단순화
KR20160037873A (ko) * 2011-09-28 2016-04-06 한국전자통신연구원 인트라 예측 모드 부호화/복호화 방법 및 장치
KR20160048025A (ko) * 2013-01-07 2016-05-03 엘지전자 주식회사 비디오 신호 처리 방법 및 장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090096659A (ko) * 2008-03-09 2009-09-14 엘지전자 주식회사 비디오 신호의 인코딩 또는 디코딩에 관한 방법과 장치
KR20160037873A (ko) * 2011-09-28 2016-04-06 한국전자통신연구원 인트라 예측 모드 부호화/복호화 방법 및 장치
KR20140098113A (ko) * 2011-11-04 2014-08-07 퀄컴 인코포레이티드 인트라 모드 비디오 코딩
KR20160048025A (ko) * 2013-01-07 2016-05-03 엘지전자 주식회사 비디오 신호 처리 방법 및 장치
KR20150115833A (ko) * 2013-02-01 2015-10-14 퀄컴 인코포레이티드 인트라 예측을 위한 모드 결정 단순화

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