WO2020050697A1 - Procédé de traitement d'image basé sur un mode de prédiction intra et dispositif associé - Google Patents

Procédé de traitement d'image basé sur un mode de prédiction intra et dispositif associé Download PDF

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WO2020050697A1
WO2020050697A1 PCT/KR2019/011588 KR2019011588W WO2020050697A1 WO 2020050697 A1 WO2020050697 A1 WO 2020050697A1 KR 2019011588 W KR2019011588 W KR 2019011588W WO 2020050697 A1 WO2020050697 A1 WO 2020050697A1
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block
mode
intra prediction
mpm
unit
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PCT/KR2019/011588
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English (en)
Korean (ko)
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이령
김승환
허진
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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
    • H04N19/10—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
    • H04N19/169—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
    • H04N19/184—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 bits, e.g. of the compressed video stream
    • 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
    • H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques

Definitions

  • the present invention relates to a method for processing a still image or a video, and more particularly, to a method for encoding / decoding a still image or a video based on an intra prediction mode and an apparatus supporting the same.
  • Compression coding refers to a series of signal processing techniques for transmitting digitized information through a communication line or storing it in a form suitable for a storage medium.
  • Media such as video, image, and audio may be the subject of compression encoding, and a technique for performing compression encoding on an image is referred to as video image compression.
  • Next-generation video content will have the characteristics of high spatial resolution, high frame rate and high dimensionality of scene representation. In order to process such content, a huge increase in terms of memory storage, memory access rate and processing power will be produced.
  • an object of the present invention is to propose a method for generating an MPM list that can improve such problems and increase diversity of MPM candidates.
  • an MPM flag indicating whether a Most Probable Mode (MPM) is applied to a current block, wherein the MPM is Indicates a mode in which the intra prediction mode of the current block is derived from the intra predicted block around the current block;
  • MPM is applied to the current block, constructing an MPM list based on intra prediction modes of left and upper neighboring blocks of the current block;
  • the upper neighboring block may be set as a block including pixels adjacent in a vertical direction of a right uppermost sample in the current block.
  • the constructing the MPM list may include: checking whether intra prediction modes of the left and upper neighboring blocks are the same; Checking whether the intra prediction mode of the upper neighboring block is less than 2 when the intra prediction mode of the left and upper neighboring blocks are the same; If the intra prediction mode of the upper neighboring block is less than 2, generating a first MPM list; And when the intra prediction mode of the upper neighboring block is not less than 2, generating a second MPM list.
  • the first MPM list includes a planar mode, a DC mode, a vertical mode, a horizontal mode, a horizontal diagonal mode and a vertical diagonal mode
  • the second MPM list includes a planar mode, a DC mode, and the upper neighbor
  • the intra prediction mode of the block and the two intra prediction modes closest to the intra prediction mode of the upper neighboring block may be included.
  • the step of constructing the MPM list is that the left or upper neighboring block is not available, is not a block coded in intra prediction mode, or is not located in a current coding tree unit (CTU). If not, the method may further include setting the intra prediction mode of the left or upper neighboring block to a planar mode.
  • CTU current coding tree unit
  • the MPM list includes 6 MPM candidates, and among indexes indicating the 6 MPM candidates, index 0 is binarized to 00, index 1 is binarized to 01, and index 2 is It can be binarized to 100, index 3 is binarized to 101, index 4 is binarized to 110, and index 5 can be binarized to 111.
  • an MPM flag acquiring unit that acquires an MPM flag indicating whether a Most Probable Mode (MPM) is applied to a current block
  • the MPM indicates a mode in which the intra prediction mode of the current block is derived from the intra predicted block around the current block
  • An MPM list construction unit configured to configure an MPM list based on intra prediction modes of left and upper neighboring blocks of the current block when MPM is applied to the current block
  • a prediction block generator configured to generate a prediction block of the current block using an intra prediction mode specified by the MPM index, wherein the left neighboring block includes pixels adjacent in the horizontal direction of the lower left sample in the current block.
  • the upper neighboring block may be set as a block including pixels adjacent in the vertical direction of the upper right sample in the current block.
  • the intra prediction mode of the left and upper neighboring blocks at different positions from the conventional image compression technique by using the intra prediction mode of the left and upper neighboring blocks at different positions from the conventional image compression technique, more various MPM lists can be constructed.
  • FIG. 1 is an embodiment to which the present invention is applied, and shows a schematic block diagram of an encoding device in which encoding of a video / image signal is performed.
  • FIG. 2 is an embodiment to which the present invention is applied, and shows a schematic block diagram of a decoding apparatus in which decoding of a video / image signal is performed.
  • 3 is an embodiment to which the present invention can be applied, and is a view showing an example of a multi-type tree structure.
  • FIG. 4 is an embodiment to which the present invention can be applied, and is a diagram illustrating a signaling mechanism of partition partitioning information of a quadtree with nested multi-type tree structure.
  • FIG. 5 is an embodiment to which the present invention can be applied, and is a diagram illustrating a method of dividing a CTU into multiple CUs based on a quadtree and nested multi-type tree structure.
  • FIG. 6 is an embodiment to which the present invention can be applied, and is a diagram illustrating a method for limiting ternary-tree partitioning.
  • FIG. 7 is an embodiment to which the present invention can be applied, and is a diagram illustrating redundant splitting patterns that may occur in binary tree splitting and ternary tree splitting.
  • FIGS. 8 and 9 are diagrams illustrating an intra prediction-based video / video encoding method according to an embodiment of the present invention and an intra prediction unit in an encoding device according to an embodiment of the present invention.
  • FIGS. 10 and 11 are diagrams illustrating an intra prediction-based video / image decoding method according to an embodiment of the present invention and an intra prediction unit in a decoding apparatus according to an embodiment of the present invention.
  • FIGS. 12 and 13 are views illustrating a prediction direction of an intra prediction mode according to an embodiment to which the present invention can be applied.
  • FIG 14 shows an example of a neighboring block used as an MPM candidate according to an embodiment to which the present invention can be applied.
  • 15 is a diagram illustrating an example of a component that generates an MPM list according to an embodiment of the present invention.
  • 16 is a flowchart illustrating a method of generating an intra prediction block according to an embodiment to which the present invention is applied.
  • 17 is a diagram illustrating an intra prediction apparatus according to an embodiment to which the present invention is applied.
  • FIG. 18 shows a video coding system to which the present invention is applied.
  • 19 is an embodiment to which the present invention is applied, and shows a structure diagram of a content streaming system.
  • the term 'processing unit' in the present specification means a unit in which encoding / decoding processing processes such as prediction, transformation, and / or quantization are performed.
  • the processing unit may be referred to as a 'processing block' or a 'block'.
  • the processing unit may be interpreted to include a unit for a luminance component and a unit for a chroma component.
  • the processing unit may correspond to a coding tree unit (CTU), a coding unit (CU), a prediction unit (PU), or a transform unit (TU).
  • CTU coding tree unit
  • CU coding unit
  • PU prediction unit
  • TU transform unit
  • the processing unit may be interpreted as a unit for a luma component or a unit for a chroma component.
  • the processing unit may include a coding tree block (CTB) for a luminance component, a coding block (CB), a prediction block (PU), or a transform block (TB). ).
  • CB coding tree block
  • PU prediction block
  • TB transform block
  • the processing unit may be interpreted to include a unit for a luminance component and a unit for a chroma component.
  • processing unit is not necessarily limited to square blocks, and may be configured in a polygonal shape having three or more vertices.
  • a pixel or a pixel is referred to as a sample in this specification.
  • using a sample may mean using a pixel value or a pixel value.
  • FIG. 1 is an embodiment to which the present invention is applied, and shows a schematic block diagram of an encoding device in which encoding of a video / image signal is performed.
  • the encoding apparatus 100 includes an image segmentation unit 110, a subtraction unit 115, a conversion unit 120, a quantization unit 130, an inverse quantization unit 140, and an inverse conversion unit 150, It may be configured to include an adder 155, a filtering unit 160, a memory 170, an inter prediction unit 180, an intra prediction unit 185, and an entropy encoding unit 190.
  • the inter prediction unit 180 and the intra prediction unit 185 may be collectively referred to as a prediction unit.
  • the prediction unit may include an inter prediction unit 180 and an intra prediction unit 185.
  • the transform unit 120, the quantization unit 130, the inverse quantization unit 140, and the inverse transform unit 150 may be included in a residual processing unit.
  • the residual processing unit may further include a subtraction unit 115.
  • the filtering unit 160, the inter prediction unit 180, the intra prediction unit 185, and the entropy encoding unit 190 may be configured by one hardware component (for example, an encoder or processor).
  • the memory 170 may include a decoded picture buffer (DPB), or may be configured by a digital storage medium.
  • DPB decoded picture buffer
  • the image splitter 110 may divide the input image (or picture, frame) input to the encoding apparatus 100 into one or more processing units.
  • the processing unit may be called a coding unit (CU).
  • the coding unit may be recursively divided according to a quad-tree binary-tree (QTBT) structure from a coding tree unit (CTU) or a largest coding unit (LCU).
  • QTBT quad-tree binary-tree
  • CTU coding tree unit
  • LCU largest coding unit
  • one coding unit may be divided into a plurality of coding units of a deeper depth based on a quad tree structure and / or a binary tree structure.
  • a quad tree structure may be applied first, and a binary tree structure may be applied later.
  • a binary tree structure may be applied first.
  • the coding procedure according to the present invention can be performed based on the final coding unit that is no longer split.
  • the maximum coding unit may be directly used as a final coding unit based on coding efficiency according to image characteristics, or the coding unit may be recursively divided into coding units having a lower depth than optimal if necessary.
  • the coding unit of the size of can be used as the final coding unit.
  • the coding procedure may include procedures such as prediction, transformation, and reconstruction, which will be described later.
  • the processing unit may further include a prediction unit (PU) or a transform unit (TU).
  • the prediction unit and the transform unit may be partitioned or partitioned from the above-described final coding unit, respectively.
  • the prediction unit may be a unit of sample prediction
  • the transformation unit may be a unit for deriving a transform coefficient and / or a unit for deriving a residual signal from the transform coefficient.
  • the unit may be used interchangeably with terms such as a block or area depending on the case.
  • the MxN block may represent samples of M columns and N rows or a set of transform coefficients.
  • the sample may generally represent a pixel or a pixel value, and may indicate only a pixel / pixel value of a luma component or only a pixel / pixel value of a saturation component.
  • the sample may be used as a term for one picture (or image) corresponding to a pixel or pel.
  • the encoding apparatus 100 subtracts a prediction signal (a predicted block, a prediction sample array) output from the inter prediction unit 180 or the intra prediction unit 185 from the input image signal (original block, original sample array)
  • a signal residual signal, residual block, residual sample array
  • a unit that subtracts a prediction signal (a prediction block, a prediction sample array) from an input image signal (original block, original sample array) in the encoder 100 may be referred to as a subtraction unit 115.
  • the prediction unit may perform prediction on a block to be processed (hereinafter, referred to as a current block), and generate a predicted block including prediction samples for the current block.
  • the prediction unit may determine whether intra prediction or inter prediction is applied in units of a current block or CU. As described later in the description of each prediction mode, the prediction unit may generate various information regarding prediction, such as prediction mode information, and transmit it to the entropy encoding unit 190.
  • the prediction information may be encoded by the entropy encoding unit 190 and output in the form of a bitstream.
  • the intra prediction unit 185 may predict the current block by referring to samples in the current picture.
  • the referenced samples may be located in the neighborhood of the current block or may be located apart depending on a prediction mode.
  • prediction modes may include a plurality of non-directional modes and a plurality of directional modes.
  • the non-directional mode may include, for example, a DC mode and a planar mode (Planar mode).
  • the directional mode may include, for example, 33 directional prediction modes or 65 directional prediction modes depending on the degree of detail of the prediction direction. However, this is an example, and more or less directional prediction modes may be used depending on the setting.
  • the intra prediction unit 185 may determine a prediction mode applied to the current block using a prediction mode applied to neighboring blocks.
  • the inter prediction unit 180 may derive a predicted block for the current block based on a reference block (reference sample array) specified by a motion vector on the reference picture.
  • motion information may be predicted in units of blocks, subblocks, or samples based on the correlation of motion information between a neighboring block and a current block.
  • the motion information may include a motion vector and a reference picture index.
  • the motion information may further include inter prediction direction (L0 prediction, L1 prediction, Bi prediction, etc.) information.
  • the neighboring block may include a spatial neighboring block existing in the current picture and a temporal neighboring block present in the reference picture.
  • the reference picture including the reference block and the reference picture including the temporal neighboring block may be the same or different.
  • the temporal neighboring block may be referred to by a name such as a collocated reference block or a colCU, and a reference picture including the temporal neighboring block may be called a collocated picture (colPic).
  • the inter prediction unit 180 constructs a motion information candidate list based on neighboring blocks, and provides information indicating which candidate is used to derive the motion vector and / or reference picture index of the current block. Can be created. Inter prediction may be performed based on various prediction modes. For example, in the case of the skip mode and the merge mode, the inter prediction unit 180 may use motion information of neighboring blocks as motion information of the current block.
  • the residual signal may not be transmitted.
  • a motion vector of a current block is obtained by using a motion vector of a neighboring block as a motion vector predictor and signaling a motion vector difference. I can order.
  • the prediction signal generated by the inter prediction unit 180 or the intra prediction unit 185 may be used to generate a reconstructed signal or may be used to generate a residual signal.
  • the transform unit 120 may generate transform coefficients by applying a transform technique to the residual signal.
  • the transformation technique may include at least one of a DCT (Discrete Cosine Transform), a DST (Discrete Sine Transform), a KLT (Karhunen-Loeve Transform), a GBT (Graph-Based Transform), or a CNT (Conditionally Non-linear Transform).
  • GBT refers to a transformation obtained from this graph when it is said that the relationship information between pixels is graphically represented.
  • CNT means a transform obtained by generating a predictive signal using all previously reconstructed pixels and based on it.
  • the transform process may be applied to pixel blocks having the same size of a square, or may be applied to blocks of variable sizes other than squares.
  • the quantization unit 130 quantizes the transform coefficients and transmits them to the entropy encoding unit 190, and the entropy encoding unit 190 encodes a quantized signal (information about quantized transform coefficients) and outputs it as a bitstream. have. Information about the quantized transform coefficients may be called residual information.
  • the quantization unit 130 may rearrange block-type quantized transform coefficients into a one-dimensional vector form based on a coefficient scan order, and quantize the quantized transform coefficients based on the one-dimensional vector form. Information regarding transform coefficients may be generated.
  • the entropy encoding unit 190 may perform various encoding methods such as exponential Golomb (CAVLC), context-adaptive variable length coding (CAVLC), and context-adaptive binary arithmetic coding (CABAC).
  • the entropy encoding unit 190 may encode information necessary for video / image reconstruction (eg, values of syntax elements, etc.) together with the quantized transform coefficients together or separately.
  • the encoded information (ex. Encoded video / video information) may be transmitted or stored in units of network abstraction layer (NAL) units in the form of a bitstream.
  • NAL network abstraction layer
  • the network may include a broadcasting network and / or a communication network
  • the digital storage medium may include various storage media such as USB, SD, CD, DVD, Blu-ray, HDD, SSD.
  • the signal output from the entropy encoding unit 190 may be configured as an internal / external element of the encoding apparatus 100 by a transmitting unit (not shown) and / or a storing unit (not shown) for storing, or the transmitting unit It may be a component of the entropy encoding unit 190.
  • the quantized transform coefficients output from the quantization unit 130 may be used to generate a prediction signal.
  • the residual signal may be reconstructed by applying inverse quantization and inverse transform to the quantized transform coefficients through the inverse quantization unit 140 and the inverse transform unit 150 in the loop.
  • the adder 155 adds the reconstructed residual signal to the predicted signal output from the inter predictor 180 or the intra predictor 185, so that the reconstructed signal (restored picture, reconstructed block, reconstructed sample array) Can be created. If there is no residual for the block to be processed, such as when the skip mode is applied, the predicted block may be used as a reconstructed block.
  • the adding unit 155 may be called a restoration unit or a restoration block generation unit.
  • the generated reconstructed signal may be used for intra prediction of the next processing target block in the current picture, or may be used for inter prediction of the next picture through filtering as described below.
  • the filtering unit 160 may apply subjective filtering to the reconstructed signal to improve subjective / objective image quality.
  • the filtering unit 160 may generate a modified reconstructed picture by applying various filtering methods to the reconstructed picture, and the modified reconstructed picture may be a DPB of the memory 170, specifically, the memory 170 Can be stored in.
  • the various filtering methods may include, for example, deblocking filtering, sample adaptive offset, adaptive loop filter, bilateral filter, and the like.
  • the filtering unit 160 may generate various information regarding filtering as described later in the description of each filtering method and transmit it to the entropy encoding unit 190.
  • the filtering information may be encoded by the entropy encoding unit 190 and output in the form of a bitstream.
  • the modified reconstructed picture transmitted to the memory 170 may be used as a reference picture in the inter prediction unit 180.
  • the inter prediction is applied through the encoding apparatus, prediction mismatch between the encoding apparatus 100 and the decoding apparatus can be avoided, and encoding efficiency can be improved.
  • the memory 170 DPB may store the modified reconstructed picture for use as a reference picture in the inter prediction unit 180.
  • the memory 170 may store motion information of a block from which motion information in a current picture is derived (or encoded) and / or motion information of blocks in a picture that has already been reconstructed.
  • the stored motion information may be transmitted to the inter prediction unit 180 for use as motion information of a spatial neighboring block or motion information of a temporal neighboring block.
  • the memory 170 may store reconstructed samples of blocks reconstructed in the current picture, and may transmit the reconstructed samples to the intra prediction unit 185.
  • FIG. 2 is an embodiment to which the present invention is applied, and shows a schematic block diagram of a decoding apparatus in which decoding of a video / image signal is performed.
  • the decoding apparatus 200 includes an entropy decoding unit 210, an inverse quantization unit 220, an inverse conversion unit 230, an addition unit 235, a filtering unit 240, a memory 250, and an inter It may be configured to include a prediction unit 260 and the intra prediction unit 265.
  • the inter prediction unit 260 and the intra prediction unit 265 may be collectively called a prediction unit. That is, the prediction unit may include an inter prediction unit 180 and an intra prediction unit 185.
  • the inverse quantization unit 220 and the inverse conversion unit 230 may be collectively referred to as a residual processing unit. That is, the residual processing unit may include an inverse quantization unit 220 and an inverse conversion unit 230.
  • the entropy decoding unit 210, the inverse quantization unit 220, the inverse transform unit 230, the addition unit 235, the filtering unit 240, the inter prediction unit 260, and the intra prediction unit 265 described above are embodiments. It may be configured by one hardware component (for example, a decoder or processor). Also, the memory 170 may include a decoded picture buffer (DPB), or may be configured by a digital storage medium.
  • DPB decoded picture buffer
  • the decoding apparatus 200 may restore an image in response to a process in which the video / image information is processed in the encoding apparatus of FIG. 1.
  • the decoding apparatus 200 may perform decoding using a processing unit applied in the encoding apparatus.
  • the processing unit of decoding may be, for example, a coding unit, and the coding unit may be divided along a quad tree structure and / or a binary tree structure from a coding tree unit or a largest coding unit. Then, the decoded video signal decoded and output through the decoding apparatus 200 may be reproduced through the reproduction apparatus.
  • the decoding apparatus 200 may receive the signal output from the encoding apparatus of FIG. 1 in the form of a bitstream, and the received signal may be decoded through the entropy decoding unit 210.
  • the entropy decoding unit 210 may parse the bitstream to derive information (eg, video / image information) necessary for image reconstruction (or picture reconstruction).
  • the entropy decoding unit 210 decodes information in a bitstream based on a coding method such as exponential Golomb coding, CAVLC, or CABAC, and quantizes a value of a syntax element required for image reconstruction and a transform coefficient for residual.
  • the CABAC entropy decoding method receives bins corresponding to each syntax element in the bitstream, and decodes the syntax element information to be decoded and decoding information of neighboring and decoding target blocks or information of symbols / bins decoded in the previous step.
  • the context model is determined by using, and the probability of occurrence of the bin is predicted according to the determined context model, and arithmetic decoding of the bin is performed to generate a symbol corresponding to the value of each syntax element. have.
  • the CABAC entropy decoding method may update the context model using the decoded symbol / bin information for the next symbol / bin context model after determining the context model.
  • the entropy decoding unit 210 performs entropy decoding.
  • the dual value that is, quantized transform coefficients and related parameter information may be input to the inverse quantization unit 220.
  • information related to filtering among information decoded by the entropy decoding unit 210 may be provided to the filtering unit 240.
  • a receiving unit (not shown) receiving a signal output from the encoding device may be further configured as an internal / external element of the decoding device 200, or the receiving unit may be a component of the entropy decoding unit 210.
  • the inverse quantization unit 220 may inverse quantize the quantized transform coefficients to output transform coefficients.
  • the inverse quantization unit 220 may rearrange the quantized transform coefficients in a two-dimensional block form. In this case, the reordering may be performed based on the coefficient scan order performed by the encoding device.
  • the inverse quantization unit 220 may perform inverse quantization on the quantized transform coefficients by using a quantization parameter (for example, quantization step size information), and obtain transform coefficients.
  • a quantization parameter for example, quantization step size information
  • the inverse transform unit 230 inversely transforms the transform coefficients to obtain a residual signal (residual block, residual sample array).
  • the prediction unit may perform prediction on the current block and generate a predicted block including prediction samples for the current block.
  • the prediction unit may determine whether intra prediction is applied or inter prediction is applied to the current block based on information about the prediction output from the entropy decoding unit 210, and may determine a specific intra / inter prediction mode.
  • the intra prediction unit 265 may predict the current block by referring to samples in the current picture.
  • the referenced samples may be located in the neighborhood of the current block or may be located apart depending on a prediction mode.
  • prediction modes may include a plurality of non-directional modes and a plurality of directional modes.
  • the intra prediction unit 265 may determine a prediction mode applied to the current block using a prediction mode applied to neighboring blocks.
  • the inter prediction unit 260 may derive the predicted block for the current block based on a reference block (reference sample array) specified by a motion vector on the reference picture.
  • motion information may be predicted in units of blocks, subblocks, or samples based on the correlation of motion information between a neighboring block and a current block.
  • the motion information may include a motion vector and a reference picture index.
  • the motion information may further include inter prediction direction (L0 prediction, L1 prediction, Bi prediction, etc.) information.
  • the neighboring block may include a spatial neighboring block existing in the current picture and a temporal neighboring block present in the reference picture.
  • the inter prediction unit 260 may construct a motion information candidate list based on neighboring blocks, and derive a motion vector and / or reference picture index of the current block based on the received candidate selection information.
  • Inter prediction may be performed based on various prediction modes, and information on the prediction may include information indicating a mode of inter prediction for the current block.
  • the adding unit 235 adds the obtained residual signal to the prediction signal (predicted block, prediction sample array) output from the inter prediction unit 260 or the intra prediction unit 265, thereby restoring signals (restored pictures, reconstructed blocks). , A reconstructed sample array). If there is no residual for the block to be processed, such as when the skip mode is applied, the predicted block may be used as a reconstructed block.
  • the adding unit 235 may be called a restoration unit or a restoration block generation unit.
  • the generated reconstructed signal may be used for intra prediction of the next processing target block in the current picture, or may be used for inter prediction of the next picture through filtering as described below.
  • the filtering unit 240 may improve subjective / objective image quality by applying filtering to the reconstructed signal.
  • the filtering unit 240 may generate a modified reconstructed picture by applying various filtering methods to the reconstructed picture, and the modified reconstructed picture may be a DPB of the memory 250, specifically, the memory 250 Can be transferred to.
  • the various filtering methods may include, for example, deblocking filtering, sample adaptive offset, adaptive loop filter, bilateral filter, and the like.
  • the (corrected) reconstructed picture stored in the DPB of the memory 250 may be used as a reference picture in the inter prediction unit 260.
  • the memory 250 may store motion information of a block from which motion information in a current picture is derived (or decoded) and / or motion information of blocks in a picture that has already been reconstructed.
  • the stored motion information may be transmitted to the inter prediction unit 260 to be used as motion information of a spatial neighboring block or motion information of a temporal neighboring block.
  • the memory 170 may store reconstructed samples of blocks reconstructed in the current picture, and may transmit the reconstructed samples to the intra prediction unit 265.
  • the embodiments described in the filtering unit 160, the inter prediction unit 180, and the intra prediction unit 185 of the encoding apparatus 100 are respectively the filtering unit 240 and the inter prediction of the decoding apparatus 200. The same may be applied to the unit 260 and the intra prediction unit 265.
  • the video / image coding method according to this document may be performed based on various detailed technologies, and the detailed description of each detailed technology is as follows.
  • the techniques described below include prediction in the video / image encoding / decoding procedure described above and / or described below, residual processing ((inverse) transform, (inverse) quantization, etc.), syntax element coding, filtering, partitioning / partitioning, etc. It will be apparent to those skilled in the art that it may be involved in the relevant procedures.
  • the block partitioning procedure according to the present document is performed by the image segmentation unit 110 of the above-described encoding device, so that the partitioning-related information is (encoded) processed by the entropy encoding unit 190 and transmitted to the decoding device in the form of a bitstream.
  • the entropy decoding unit 210 of the decoding apparatus derives a block partitioning structure of the current picture based on the partitioning-related information obtained from the bitstream, and based on this, a series of procedures for decoding the image (ex. Prediction, residual Processing, block reconstruction, in-loop filtering, etc.).
  • the CTU may correspond to a coding tree block (CTB).
  • CTB coding tree block
  • the CTU may include a coding tree block of luma samples and two coding tree blocks of corresponding chroma samples.
  • the CTU may include two corresponding blocks of chroma samples and an NxN block of luma samples.
  • the maximum allowable size of the CTU for coding and prediction may be different from the maximum allowable size of the CTU for transformation.
  • the maximum allowable size of the luma block in the CTU may be 128x128.
  • the CTU may be divided into CUs based on a quad-tree (QT) structure.
  • the quadtree structure may be referred to as a quaternary tree structure. This is to reflect various local characteristics.
  • the CTU can be divided based on multi-type tree structure division including a binary tree (BT) and a ternary tree (TT) as well as a quad tree.
  • the QTBT structure may include a quadtree and binary tree based partitioning structure
  • the QTBTTT may include a quadtree, binary tree and ternary tree based partitioning structure.
  • the QTBT structure may include a quadtree, binary tree, and ternary tree based splitting structure.
  • the CU can have a square or rectangular shape.
  • the CTU can be first divided into a quadtree structure. Thereafter, leaf nodes having a quadtree structure may be additionally divided by a multi-type tree structure.
  • 3 is an embodiment to which the present invention can be applied, and is a view showing an example of a multi-type tree structure.
  • the multitype tree structure may include four split types as shown in FIG. 3.
  • the four division types are vertical binary splitting (SPLIT_BT_VER), horizontal binary splitting (SPLIT_BT_HOR), vertical ternary splitting (SPLIT_TT_VER), horizontal ternary splitting (horizontal ternary splitting, SPLIT_TT_HOR) ).
  • Leaf nodes of the multi-type tree structure may be referred to as CUs. These CUs can be used for prediction and transformation procedures.
  • CU, PU, and TU may have the same block size. However, when the maximum supported transform length is smaller than the width or height of the color component of the CU, the CU and the TU may have different block sizes.
  • FIG. 4 is an embodiment to which the present invention can be applied, and is a diagram illustrating a signaling mechanism of partition partitioning information of a quadtree with nested multi-type tree structure.
  • the CTU is treated as the root of the quadtree, and is first partitioned into a quadtree structure.
  • Each quadtree leaf node can then be further partitioned into a multitype tree structure.
  • a first flag (ex. Mtt_split_cu_flag) is signaled to indicate whether the corresponding node is additionally partitioned. If the corresponding node is additionally partitioned, a second flag (a second flag, ex. Mtt_split_cu_verticla_flag) may be signaled to indicate a splitting direction. Then, a third flag (a third flag, ex.
  • Mtt_split_cu_binary_flag may be signaled to indicate whether the partition type is binary partition or ternary partition. For example, based on the mtt_split_cu_vertical_flag and the mtt_split_cu_binary_flag, a multi-type tree splitting mode (MttSplitMode) of a CU may be derived as shown in Table 1 below.
  • FIG. 5 is an embodiment to which the present invention can be applied, and is a diagram illustrating a method of dividing a CTU into multiple CUs based on a quadtree and nested multi-type tree structure.
  • a quadtree partition with a multitype tree can provide a content-adapted coding tree structure.
  • the CU may correspond to a coding block (CB).
  • the CU may include a coding block of luma samples and two coding blocks of corresponding chroma samples.
  • the size of a CU may be as large as a CTU, or may be cut by 4x4 in luma sample units. For example, in the case of a 4: 2: 0 color format (or chroma format), the maximum chroma CB size may be 64x64 and the minimum chroma CB size may be 2x2.
  • the maximum allowed luma TB size may be 64x64 and the maximum allowed chroma TB size may be 32x32. If the width or height of the CB divided according to the tree structure is greater than the maximum conversion width or height, the CB may be automatically (or implicitly) divided until the horizontal and vertical TB size limitations are satisfied.
  • the following parameters may be defined and identified as SPS syntax elements.
  • -CTU size the root node size of a quaternary tree
  • the CTU size may be set to 64x64 blocks of 128x128 luma samples and two corresponding chroma samples (in 4: 2: 0 chroma format).
  • MinOTSize is set to 16x16
  • MaxBtSize is set to 128x1208
  • MaxTtSzie is set to 64x64
  • MinBtSize and MinTtSize (for both width and height) can be set to 4x4
  • MaxMttDepth can be set to 4.
  • Quarttree partitioning can be applied to CTU to generate quadtree leaf nodes.
  • the quadtree leaf node may be referred to as a leaf QT node.
  • Quadtree leaf nodes may have a size of 128x128 (i.e. the CTU size) from a size of 16x16 (i.e. the MinOTSize). If the leaf QT node is 128x128, it may not be additionally divided into a binary tree / ternary tree. This is because, even in this case, it exceeds MaxBtsize and MaxTtszie (i.e. 64x64). In other cases, the leaf QT node may be further divided into a multi-type tree. Therefore, the leaf QT node is a root node for the multitype tree, and the leaf QT node may have a multitype tree depth (mttDepth) 0 value.
  • mttDepth multitype tree depth
  • MaxMttdepth (ex. 4)
  • further partitioning may not be considered. If the width of the multitype tree node is equal to MinBtSize and less than or equal to 2xMinTtSize, additional horizontal splitting may no longer be considered. If the height of the multitype tree node is equal to MinBtSize and less than or equal to 2xMinTtSize, additional vertical splitting may not be considered any more.
  • FIG. 6 is an embodiment to which the present invention can be applied, and is a diagram illustrating a method for limiting ternary-tree partitioning.
  • TT partitioning may be limited in certain cases to allow for a 64x64 luma block and 32x32 chroma pipeline design in a hardware decoder. For example, if the width or height of the luma coding block is greater than a predetermined specific value (eg, 32, 64), as illustrated in FIG. 6, TT segmentation may be limited.
  • a predetermined specific value eg, 32, 64
  • the coding tree scheme may support luma and chroma blocks having a separate block tree structure.
  • luma and chroma CTBs in one CTU can be restricted to have the same coding tree structure.
  • luma and chroma blocks may have a separate block tree structure from each other. If the individual block tree mode is applied, the luma CTB may be divided into CUs based on a specific coding tree structure, and the chroma CTB may be divided into chroma CUs based on another coding tree structure. This may mean that a CU in an I slice is composed of a coding block of luma components or coding blocks of two chroma components, and a CU of a P or B slice can be composed of blocks of three color components.
  • a quadtree coding tree structure with a multi-type tree has been described, but the structure in which the CU is divided is not limited to this.
  • the BT structure and the TT structure may be interpreted as a concept included in a multiple partitioning tree (MPT) structure, and a CU may be divided through a QT structure and an MPT structure.
  • MPT multiple partitioning tree
  • a syntax element for example, MPT_split_type
  • MPT_split_mode a syntax element including information about which direction is divided between and horizontal.
  • the CU may be divided in a different way from the QT structure, BT structure or TT structure. That is, according to the QT structure, the CU of the lower depth is divided into 1/4 the size of the CU of the upper depth, or the CU of the lower depth is divided into 1/2 the size of the CU of the upper depth according to the BT structure, or according to the TT structure Unlike the CU of the lower depth, which is divided into 1/4 or 1/2 the size of the CU of the upper depth, the CU of the lower depth may be 1/5, 1/3, 3/8, 3 of the CU of the upper depth depending on the case. It may be divided into / 5, 2/3, or 5/8 size, and the method in which the CU is divided is not limited thereto.
  • the tree node block ensures that all samples of all coded CUs are located within the picture boundaries. Can be limited. In this case, for example, the following division rule may be applied.
  • the block is forced to be split with QT split mode.
  • the block is forced to be split with SPLIT_BT_HOR mode
  • the block is forced to be split with QT split mode.
  • the block is a QT node, and the size of the block is larger than the minimum QT size and the size of the block is smaller than or equal to the maximum BT size, the block is forced to be split with QT split mode or SPLIT_BT_HOR mode.
  • the block is forced to be split with SPLIT_BT_HOR mode.
  • the block is forced to be split with QT split mode.
  • the block is a QT node, and the size of the block is larger than the minimum QT size and the size of the block is smaller than or equal to the maximum BT size, the block is forced to be split with QT split mode or SPLIT_BT_VER mode.
  • the block is forced to be split with SPLIT_BT_VER mode.
  • the above-described quadtree coding block structure accompanying the multi-type tree can provide a very flexible block partitioning structure. Due to the division types supported in the multitype tree, different division patterns can potentially result in the same coding block structure in some cases. By limiting the occurrence of such redundant partition patterns, the data amount of partitioning information can be reduced. It will be described with reference to the drawings below.
  • FIG. 7 is an embodiment to which the present invention can be applied, and is a diagram illustrating redundant splitting patterns that may occur in binary tree splitting and ternary tree splitting.
  • two levels of consecutive binary splits in one direction have the same coding block structure as binary partitions for the center partition after ternary splitting.
  • the binary tree partition for the center partition of the ternary tree partition may be limited. This limitation can be applied to CUs of all pictures. When such a specific partition is limited, signaling of corresponding syntax elements can be modified to reflect this limited case, thereby reducing the number of bits signaled for partitioning. For example, as in the example shown in FIG.
  • the mtt_split_cu_binary_flag syntax element indicating whether the partition is a binary partition or a ternary partition is not signaled, and its value is It can be inferred by the decoder to zero.
  • a decoded portion of the current picture or other pictures including the current processing unit may be used.
  • Predict a picture (slice) that uses only the current picture for reconstruction i.e., a picture (slice) that performs only intra-picture prediction, an intra picture or an I picture (slice), and up to one motion vector and a reference index to predict each unit
  • a picture (slice) using a predictive picture or a P picture (slice), up to two motion vectors and a reference index may be referred to as a bi-predictive picture or a B picture (slice).
  • Inter-prediction refers to a prediction method that derives a current processing block based on a data element (eg, a sample value or a motion vector) of a picture other than the current picture. That is, it means a method of predicting a pixel value of a current processing block by referring to reconstructed regions in another reconstructed picture other than the current picture.
  • a data element eg, a sample value or a motion vector
  • intra prediction (or intra prediction) will be described in more detail.
  • Intra prediction or intra prediction
  • Intra prediction refers to a prediction method that derives a current processing block from data elements (eg, sample values, etc.) of the same decoded picture (or slice). That is, it means a method of predicting the pixel value of the current processing block by referring to the reconstructed regions in the current picture.
  • data elements eg, sample values, etc.
  • the intra prediction may represent prediction for generating a prediction sample for the current block based on a reference sample outside the current block in a picture to which the current block belongs (hereinafter, the current picture).
  • the present invention describes the detailed technique of the intra prediction method described above with reference to FIGS. 1 and 2, and may be represented by the intra prediction based video / image decoding method of FIG. 10 and the intra prediction unit of the decoding apparatus of FIG. 11, which will be described later. .
  • the encoder may be represented by the intra prediction-based video / video encoding method of FIG. 8 described later and the intra prediction unit in the encoding apparatus of FIG. 9.
  • the data encoded by FIGS. 8 and 9 can be stored in the form of a bitstream.
  • peripheral reference samples to be used for intra prediction of the current block may be derived.
  • the neighboring reference samples of the current block are samples adjacent to the left boundary of the current block of nWxnH size and total 2xnH samples adjacent to the bottom-left, samples adjacent to the top boundary of the current block. And a total of 2xnW samples neighboring the top-right and one sample neighboring the top-left of the current block.
  • the peripheral reference samples of the current block may include multiple columns of upper peripheral samples and multiple rows of left peripheral samples.
  • the neighboring reference samples of the current block have a total nH samples adjacent to the right boundary of the current block of size nWxnH, a total nW samples adjacent to the bottom boundary of the current block, and the lower right side of the current block. (bottom-right) may include one neighboring sample.
  • the decoder may construct surrounding reference samples to be used for prediction by substituting unavailable samples with available samples.
  • peripheral reference samples to be used for prediction may be configured through interpolation of available samples.
  • a prediction sample may be derived based on an average or interpolation of neighboring reference samples of the current block, and (ii) prediction among neighboring reference samples of the current block
  • the prediction sample may be derived based on a reference sample present in a specific (predictive) direction with respect to the sample. In the case of (i), it may be called a non-directional mode or a non-angle mode, and in the case of (ii), a directional mode or an angular mode.
  • the interpolation between the second neighboring sample and the first neighboring sample located in a direction opposite to the prediction direction of the intra prediction mode of the current block based on the predicted sample of the current block among the neighboring reference samples Predictive samples may be generated.
  • LIP linear interpolation intra prediction
  • a temporary prediction sample of the current block is derived based on filtered peripheral reference samples, and at least one of the existing peripheral reference samples, ie, unfiltered peripheral reference samples, derived according to the intra prediction mode
  • a prediction sample of the current block may be derived by weighting a sum of a reference sample and the temporary prediction sample.
  • PDPC Part dependent intra prediction
  • post-process filtering may be performed on the predicted samples derived as necessary.
  • the intra prediction procedure may include an intra prediction mode determination step, a peripheral reference sample derivation step, and an intra prediction mode based prediction sample derivation step. Also, a post-filtering step may be performed on the predicted sample derived as necessary.
  • the video / video encoding procedure based on intra prediction and the intra prediction unit in the encoding device may schematically include, for example, the following.
  • FIGS. 8 and 9 are diagrams illustrating an intra prediction-based video / video encoding method according to an embodiment of the present invention and an intra prediction unit in an encoding device according to an embodiment of the present invention.
  • S801 may be performed by the intra prediction unit 185 of the encoding device, and S802 may be performed by the residual processing unit of the encoding device. Specifically, S802 may be performed by the subtraction unit 115 of the encoding device.
  • the prediction information is derived by the intra prediction unit 185 and may be encoded by the entropy encoding unit 190.
  • the residual information is derived by the residual processing unit and may be encoded by the entropy encoding unit 190.
  • the residual information is information about the residual samples.
  • the residual information may include information about quantized transform coefficients for the residual samples.
  • the residual samples may be derived as transform coefficients through the transform unit 120 of the encoding apparatus, and the transform coefficients may be derived as quantized transform coefficients through the quantization unit 130.
  • Information about the quantized transform coefficients may be encoded in the entropy encoding unit 190 through a residual coding procedure.
  • the encoding device performs intra prediction on the current block (S801).
  • the encoding apparatus may derive an intra prediction mode for the current block, derive neighbor reference samples of the current block, and generate prediction samples in the current block based on the intra prediction mode and the neighbor reference samples.
  • the intra prediction mode determination, neighboring reference samples may be performed simultaneously, or one procedure may be performed before another procedure.
  • the intra prediction unit of the encoding apparatus may include a prediction mode determination unit 186, a reference sample derivation unit 187, a prediction sample derivation unit 188, and the prediction mode determination unit 186 determines an intra prediction mode for the current block
  • the reference sample derivation unit 187 may derive neighboring reference samples of the current block, and the prediction sample derivation unit 188 may deduce motion samples of the current block.
  • the intra prediction unit 185 may further include a prediction sample filter unit (not shown)
  • the encoding device may include the current block among a plurality of intra prediction modes. The encoding apparatus may compare the RD cost for the intra prediction modes and determine an optimal intra prediction mode for the current block.
  • the encoding device may perform a prediction sample filtering procedure.
  • Predictive sample filtering may be referred to as post filtering. Some or all of the prediction samples may be filtered by the prediction sample filtering procedure. In some cases, the prediction sample filtering procedure may be omitted.
  • the encoding apparatus generates residual samples for the current block based on the (filtered) prediction sample (S802).
  • the encoding apparatus may encode image information including prediction mode information indicating the intra prediction mode and residual information about the residual samples (S803).
  • the encoded image information may be output in the form of a bit stream.
  • the output bitstream may be delivered to a decoding device through a storage medium or network.
  • the encoding apparatus may generate a reconstructed picture (including reconstructed samples and reconstructed blocks) based on the reference samples and the residual samples. This is for deriving the same prediction result as that performed in the decoding device in the encoding device, because it is possible to increase coding efficiency.
  • the above-described in-loop filtering procedure may be further applied to the reconstructed picture.
  • FIGS. 10 and 11 are diagrams illustrating an intra prediction-based video / image decoding method according to an embodiment of the present invention and an intra prediction unit in a decoding apparatus according to an embodiment of the present invention.
  • the decoding apparatus may perform an operation corresponding to an operation performed in the encoding apparatus.
  • the decoding apparatus may perform prediction on the current block based on the received prediction information and derive prediction samples.
  • the decoding apparatus may derive an intra prediction mode for the current block based on the received prediction mode information (S1001).
  • the decoding apparatus may derive neighboring reference samples of the current block (S1002).
  • the decoding apparatus generates prediction samples in the current block based on the intra prediction mode and the surrounding reference samples (S1003).
  • the decoding apparatus may perform a prediction sample filtering procedure. Predictive sample filtering may be referred to as post filtering. Some or all of the prediction samples may be filtered by the prediction sample filtering procedure. In some cases, the prediction sample filtering procedure may be omitted.
  • the decoding apparatus generates residual samples for the current block based on the received residual information (S1004).
  • the decoding apparatus may generate reconstructed samples for the current block based on the (filtered) predicted samples and the residual samples, and generate a reconstructed picture based on the reconstructed pictures (S1005).
  • the intra prediction unit 265 of the decoding apparatus may include a prediction mode determination unit 266, a reference sample derivation unit 267, and a prediction sample derivation unit 268, and the prediction mode determination unit 266 is encoded.
  • the intra prediction mode for the current block is determined based on the prediction mode information received from the prediction mode determination unit 186 of the device, and the reference sample derivation unit 266 derives neighboring reference samples of the current block and predicts it.
  • the sample derivation unit 267 may derive prediction samples of the current block.
  • the intra prediction unit 265 may further include a prediction sample filter unit (not shown).
  • the prediction mode information may include flag information (ex. Prev_intra_luma_pred_flag) indicating whether most probable mode (MPM) is applied to the current block or remaining mode, and the MPM is the current When applied to a block, the prediction mode information may further include index information (ex. Mpm_idx) indicating one of the intra prediction mode candidates (MPM candidates).
  • the intra prediction mode candidates (MPM candidates) may be configured as an MPM candidate list or an MPM list.
  • the prediction mode information further includes remodeling mode information (eg, rem_inra_luma_pred_mode) indicating one of the remaining intra prediction modes except the intra prediction mode candidates (MPM candidates). It can contain.
  • the decoding apparatus may determine an intra prediction mode of the current block based on the prediction mode information.
  • the prediction mode information may be encoded / decoded through a coding method described below.
  • the prediction mode information may be encoded / decoded through encoding coding (eg, CABAC, CAVLC) based on truncated (rice) binary code.
  • an intra prediction mode applied to a current block may be determined using an intra prediction mode of neighboring blocks.
  • the decoding apparatus may select one of the most probable mode (mpm) candidates derived based on the intra prediction mode of the left block of the current block and the intra prediction mode of the upper block based on the received mpm index, or One of the remaining intra prediction modes that are not included in the mpm candidates may be selected based on the remodeling intra prediction mode information.
  • the mpm index may be signaled in the form of an mpm_idx syntax element
  • the remodeling intra prediction mode information may be signaled in the form of a rem_intra_luma_pred_mode syntax element.
  • the re-maining intra-prediction mode information may indicate one of the intra-prediction modes by indexing the remaining intra-prediction modes not included in the mpm candidates in order of prediction mode number.
  • FIGS. 12 and 13 are views illustrating a prediction direction of an intra prediction mode according to an embodiment to which the present invention can be applied.
  • the intra prediction mode may include two non-directional intra prediction modes and 33 directional intra prediction modes.
  • the non-directional intra prediction modes may include a planar intra prediction mode and a DC intra prediction mode, and the directional intra prediction modes may include intra prediction modes 2 to 34.
  • the planner intra prediction mode may be called a planner mode, and the DC intra prediction mode may be called a DC mode.
  • the directional intra prediction mode may be extended from the existing 33 to 65, as shown in FIG. 13 to be described later.
  • the intra prediction mode may include two non-directional intra prediction modes and 65 directional intra prediction modes.
  • the non-directional intra prediction modes may include a planar intra prediction mode and a DC intra prediction mode, and the directional intra prediction modes may include intra prediction modes 2 to 66.
  • the extended directional intra prediction can be applied to blocks of all sizes, and can be applied to both luma and chroma components.
  • the intra prediction mode may include 67 modes.
  • the prediction direction according to each prediction mode index (or mode number) is as illustrated in FIG. 13.
  • Prediction mode indexes 0 and 1 indicate planner mode and DC mode, respectively.
  • the prediction mode indexes 2 to 66 indicate a prediction direction of an angle divided from an arrow in the lower left direction to an arrow in the upper right direction. Of the 65 angles, prediction modes 2, 18, 50, and 66 indicate horizontal diagonal directions, horizontal directions, vertical directions, and vertical diagonal directions, respectively.
  • the intra prediction mode may include two non-directional intra prediction modes and 129 directional intra prediction modes.
  • the non-directional intra prediction modes may include a planar intra prediction mode and a DC intra prediction mode, and the directional intra prediction modes may include 2 to 130 intra prediction modes.
  • the prediction unit of the encoding device / decoding device may derive a reference sample according to the intra prediction mode of the current block among neighboring reference samples of the current block, and generate a prediction sample of the current block based on the reference sample. .
  • a prediction sample may be derived based on an average or interpolation of neighboring reference samples of the current block, and (ii) specific to a prediction sample among neighboring reference samples of the current block.
  • the prediction sample may be derived based on a reference sample present in the (prediction) direction. In the case of (i), it may be called a non-directional mode or a non-angle mode, and in the case of (ii), a directional mode or an angular mode.
  • multi-reference sample lines using one or more reference sample lines for intra prediction may be used for more accurate prediction.
  • the most probale mode is configured to effectively reduce the overhead signaling the intra prediction mode. Suggest how to do it.
  • coding efficiency can be improved in terms of reducing signaling overhead by efficiently coding the intra prediction mode. By reducing the signaling overhead, better coding efficiency can be obtained in terms of BD-rate / BD-PSNR.
  • the best intra prediction mode is determined as an optimized prediction mode by jointly considering bit-rate and distortion. Then, the optimal (selected) predictive intra mode is coded through the bit stream, and the decoder performs intra prediction using the optimal intra prediction mode parsed from the bit stream.
  • the increased number of intra prediction modes require efficient intra mode coding to minimize signaling overhead.
  • the MPM list (or MPM candidate list) may be constructed using intra prediction modes of neighboring intra coded blocks at both the encoder and decoder.
  • the optimal prediction mode selected by the encoder is one of prediction modes included in the MPM list, overhead may be minimized through MPM index signaling.
  • FIG 14 shows an example of a neighboring block used as an MPM candidate according to an embodiment to which the present invention can be applied.
  • a conventional image compression technique for example, HEVC
  • three MPM lists are generated based on two neighbor intra prediction modes of positions F and G shown in FIG. 14.
  • F or G may be set to DC mode, respectively.
  • -F or G is not an intra coded block
  • intra prediction modes of the A to G position blocks illustrated in FIG. 14 may be represented by A to G, respectively. That is, the F or G represents the intra prediction mode of the F or G position block, respectively. If F and G are determined, the three MPM lists may be constructed based on the pseudo codes of Table 2 below.
  • a first MPM list is generated (or derived), and F is 2 If not smaller, a second MPM list may be generated.
  • the number of MPM candidates included in the MPM list may be set differently according to the number of intra prediction modes. In general, as the number of intra prediction modes increases, the number of MPM candidates may increase. However, the present invention is not limited thereto, and for example, 35 and 67 intra modes may have various numbers of MPM candidates such as 3, 4, and 5 depending on design.
  • this intra prediction mode may be used to construct the MPM list.
  • Various intra modes need to be included in the MPM list to improve the intra mode coding efficiency and make the MPM mode more frequent.
  • the more various modes of intra-consideration are considered from various neighboring locations the better coding efficiency can be achieved.
  • the probability of having various MPM lists may increase.
  • HEVC HEVC
  • a method of constructing an MPM list using more neighboring blocks has been discussed.
  • searching for a block of a large number of locations a problem of significantly increasing complexity may occur.
  • an object of the present invention is to propose a method for generating an MPM list that can improve such problems and increase diversity of MPM candidates.
  • the geometrical distance between the G block and the F block is shorter than that of the B block and the D block. Since the distance between the B block and the D block is relatively larger than the distance between the G block and the F block, the probability is different between the G and the F (i.e., the difference between the B and D intra prediction modes). , Difference between intra prediction modes of G and F) may be small. At the same time, since the distance between the B block and the D block is relatively larger than the distance between the G block and the F block, the probability of B and D being equal may be lower than the probability of G and F being equal.
  • the C block or the E block has a position in a diagonal direction based on the current block to be predicted, and the probability of being outside the current CTU or the current pipe lining unit is greater than the B block and the D block.
  • the intra preliminary mode of the corresponding position may be regarded as a planner mode or a DC mode as in the embodiments described below. Therefore, in this case, the C block or the E block can bring about a low diversity in MPM candidate configuration compared to the B block and the D block.
  • the encoder / decoder proposes a method of constructing an MPM list using an intra prediction mode of neighboring blocks of B and D positions. That is, in the present embodiment, the encoder / decoder proposes a method of constructing an MPM list using a limited number of neighboring locations B and D in order to increase diversity of MPM candidates.
  • the locations of B and D can be used to construct MPM lists instead of G and F, respectively.
  • W and H represent the width and height of the current block.
  • 15 is a diagram illustrating an example of a component that generates an MPM list according to an embodiment of the present invention.
  • the component of FIG. 15 may be implemented with a configuration included in a decoder (or a decoding apparatus, 200 of FIG. 2 above).
  • the decoder is mainly described, but the MPM list generation method according to the present embodiment can be applied to the encoder substantially the same, and the component of FIG. 15 is similarly applied to the encoder (or encoding device, 100 of FIG. 1 above). It can be implemented in an included configuration.
  • a component for generating an MPM list may include a first component 1501, a second component 1502, and a third component 1503.
  • the first component 1501 may check whether the left and upper peripheral blocks are available. At this time, the left and upper peripheral blocks may be the peripheral blocks of positions B and D of FIG. 14 described above.
  • the second component 1502 may acquire intra prediction modes of the left and upper neighboring blocks.
  • the third component 1503 may generate the MPM list based on a predefined condition (or branch). An embodiment of the MPM list generation method will be described later.
  • the length of the MPM list (ie, the number of MPM candidates) may be extended to increase the diversity of MPMs.
  • the neighboring blocks at positions B and D can be used for generation of the extended MPM list.
  • the length of the extended MPM list may vary depending on the number of intra prediction modes, and may be defined (or determined, set) by a number greater than 3, such as 4, 5, 6, and the like.
  • the encoder / decoder can confirm whether B and D (that is, intra prediction mode of B and intra prediction mode of D) are the same.
  • the encoder / decoder can check whether B is smaller than 2 (that is, the prediction mode 2 of FIG. 13 described above). If B is less than 2, the encoder / decoder may generate (or derive) a first MPM list, and if B is not less than 2, it may generate a second MPM list.
  • the encoder / decoder can check whether B or D is not in the planner mode. If B or D is not in the planner mode, the encoder / decoder may generate a third MPM list, and if (B + D) is less than 2, a fourth list. And, in other cases, the encoder / decoder may generate the fifth MPM list.
  • an example of the MPM list generated according to the MPM list construction method of this embodiment is shown in Table 4 below.
  • the first to fifth MPM lists may include MPM candidates as shown in Table 4.
  • the length of the extended MPM list may be 4, and in this case, the encoder / decoder may construct 4 MPM lists by adding 1 MPM candidate to 3 existing MPM lists.
  • the encoder / decoder may instead use a prediction mode that occurs statistically. At this time, considering that the probability of occurrence of the planner mode is higher than that of the DC mode, the encoder / decoder sets the planner mode to the prediction mode of B or D when the intra prediction mode of the neighboring blocks of the B and D positions cannot be used ( Or use). Specifically, when at least one of the following conditions is satisfied, the encoder / decoder may set the planner mode as the prediction mode of B or D.
  • a method for binarizing an extended MPM list is proposed to efficiently code MPM.
  • 6 MPM when 6 MPM is used, as an optimal mode, a specific MPM index is spread to all indexes rather than being inclined to an index having a low probability of being hit. Therefore, hereinafter, a method of performing binarization using only 2 or 3 bins for indexes for 6 MPM candidates is proposed. Examples of the binarization proposed in this embodiment are shown in Table 5 below.
  • both the conventional 6 MPM and the proposed extended 6 MPM are binarized.
  • the proposed binarization has more advantages in MPM coding than the conventional 6 MPM, since the probability of choosing the optimal mode is not biased to a particular index.
  • the maximum number of bins required for the proposed binarization is three, whereas according to the conventional binarization, the maximum number of bins required for binarization is five.
  • the remaining modes can be coded with 5 bits.
  • 16 is a flowchart illustrating a method of generating an intra prediction block according to an embodiment to which the present invention is applied.
  • a decoder is mainly described, but the present invention is not limited thereto, and an intra prediction block generation method according to an embodiment of the present invention may be performed in the same manner in an encoder and a decoder.
  • the decoder acquires an MPM flag indicating whether a Most Probable Mode (MPM) is applied to the current block (S1601).
  • MPM indicates a mode in which the intra prediction mode of the current block is derived from the intra predicted block around the current block.
  • the decoder configures an MPM list based on intra prediction modes of the left and upper neighboring blocks of the current block (S1602).
  • the decoder acquires an MPM index indicating a specific intra prediction mode in the MPM list (S1603).
  • the decoder generates a prediction block of the current block using the intra prediction mode specified by the MPM index (S1604).
  • the left neighboring block is set as a block including pixels adjacent in the horizontal direction of the lower left sample in the current block, and the upper neighboring block includes pixels adjacent in the vertical direction of the upper right sample in the current block. It can be set as a block.
  • the step S1602 includes: checking whether intra prediction modes of the left and upper neighboring blocks are the same; Checking whether the intra prediction mode of the upper neighboring block is less than 2 when the intra prediction mode of the left and upper neighboring blocks are the same; If the intra prediction mode of the upper neighboring block is less than 2, generating a first MPM list; And when the intra prediction mode of the upper neighboring block is not less than 2, generating a second MPM list.
  • the first MPM list includes a planar mode, a DC mode, a vertical mode, a horizontal mode, a horizontal diagonal mode, and a vertical diagonal mode
  • the second MPM list is a planner mode, a DC mode , The intra prediction mode of the upper neighboring block and the two intra prediction modes closest to the intra prediction mode of the upper neighboring block.
  • the left or upper neighboring block is not available, is not a block coded in an intra prediction mode, or is not located in a current coding tree unit (CTU). If not, the method may further include setting the intra prediction mode of the left or upper neighboring block to a planar mode.
  • CTU current coding tree unit
  • the MPM list includes 6 MPM candidates, and among indexes indicating the 6 MPM candidates, index 0 is binarized to 00 and index 1 is binarized to 01, Index 2 can be binarized to 100, index 3 can be binarized to 101, index 4 can be binarized to 110, and index 5 can be binarized to 111.
  • 17 is a diagram illustrating an intra prediction apparatus according to an embodiment to which the present invention is applied.
  • the intra prediction unit is illustrated as one block, but the intra prediction unit may be implemented in a configuration included in the encoder and / or decoder.
  • the intra prediction unit implements the functions, processes, and / or methods previously proposed in FIGS. 8 to 16.
  • the intra prediction unit may include an MPM flag acquisition unit 1701, an MPM list construction unit 1702, an MPM index acquisition unit 1703, and a prediction block generation unit 1704.
  • the MPM flag acquiring unit 1701 acquires an MPM flag indicating whether Most Probable Mode (MPM) is applied to the current block.
  • MPM indicates a mode in which the intra prediction mode of the current block is derived from the intra predicted block around the current block.
  • the MPM list construction unit 1702 configures the MPM list based on the intra prediction mode of the left and upper neighboring blocks of the current block.
  • the MPM index obtaining unit 1703 acquires an MPM index indicating a specific intra prediction mode in the MPM list.
  • the prediction block generator 1704 generates a prediction block of the current block using an intra prediction mode specified by the MPM index.
  • the left neighboring block is set as a block including pixels adjacent in the horizontal direction of the lower left sample in the current block, and the upper neighboring block includes pixels adjacent in the vertical direction of the upper right sample in the current block. It can be set as a block.
  • the MPM list construction unit 1702 checks whether the intra prediction modes of the left and upper neighboring blocks are the same, and when the intra prediction modes of the left and upper neighboring blocks are the same, the It is checked whether the intra prediction mode of the upper neighboring block is less than 2, and if the intra prediction mode of the upper neighboring block is less than 2, a first MPM list is generated, and the intra prediction mode of the upper neighboring block is If not less than 2, a second MPM list may be generated.
  • the first MPM list includes a planar mode, a DC mode, a vertical mode, a horizontal mode, a horizontal diagonal mode, and a vertical diagonal mode
  • the second MPM list is a planner mode, a DC mode , The intra prediction mode of the upper neighboring block and the two intra prediction modes closest to the intra prediction mode of the upper neighboring block.
  • the MPM list construction unit 1702 is not available in the left or upper neighboring block, is not a block coded in intra prediction mode, or is currently a coding tree unit (CTU). ),
  • the intra prediction mode of the left or upper neighboring block may be set as a planar mode.
  • the MPM list includes 6 MPM candidates, and among indexes indicating the 6 MPM candidates, index 0 is binarized to 00 and index 1 is binarized to 01, Index 2 can be binarized to 100, index 3 can be binarized to 101, index 4 can be binarized to 110, and index 5 can be binarized to 111.
  • FIG. 18 shows a video coding system to which the present invention is applied.
  • the video coding system may include a source device and a receiving device.
  • the source device may deliver the encoded video / video information or data to a receiving device through a digital storage medium or network in the form of a file or streaming.
  • the source device may include a video source, an encoding apparatus, and a transmitter.
  • the receiving device may include a receiver, a decoding apparatus, and a renderer.
  • the encoding device may be called a video / video encoding device, and the decoding device may be called a video / video decoding device.
  • the transmitter can be included in the encoding device.
  • the receiver may be included in the decoding device.
  • the renderer may include a display unit, and the display unit may be configured as a separate device or an external component.
  • the video source may acquire a video / image through a capture, synthesis, or generation process of the video / image.
  • the video source may include a video / image capture device and / or a video / image generation device.
  • the video / image capture device may include, for example, one or more cameras, a video / image archive including previously captured video / images, and the like.
  • the video / image generating device may include, for example, a computer, a tablet and a smart phone, and the like (electronically) to generate the video / image.
  • a virtual video / image may be generated through a computer or the like, and in this case, the video / image capture process may be replaced by a process in which related data is generated.
  • the encoding device can encode the input video / video.
  • the encoding apparatus may perform a series of procedures such as prediction, transformation, and quantization for compression and coding efficiency.
  • the encoded data (encoded video / video information) may be output in the form of a bitstream.
  • the transmitting unit may transmit the encoded video / video information or data output in the form of a bitstream to a receiving unit of a receiving device through a digital storage medium or a network in a file or streaming format.
  • the digital storage media may include various storage media such as USB, SD, CD, DVD, Blu-ray, HDD, SSD.
  • the transmission unit may include an element for generating a media file through a predetermined file format, and may include an element for transmission through a broadcast / communication network.
  • the receiver may extract the bitstream and transmit it to the decoding device.
  • the decoding apparatus may decode a video / image by performing a series of procedures such as inverse quantization, inverse transformation, and prediction corresponding to the operation of the encoding apparatus.
  • the renderer can render the decoded video / image.
  • the rendered video / image may be displayed through the display unit.
  • 19 is an embodiment to which the present invention is applied, and shows a structure diagram of a content streaming system.
  • a content streaming system to which the present invention is applied may largely include an encoding server, a streaming server, a web server, a media storage, a user device, and a multimedia input device.
  • the encoding server serves to compress a content input from multimedia input devices such as a smartphone, a camera, and a camcorder into digital data to generate a bitstream and transmit it to the streaming server.
  • multimedia input devices such as a smartphone, a camera, and a camcorder directly generate a bitstream
  • the encoding server may be omitted.
  • the bitstream may be generated by an encoding method or a bitstream generation method to which the present invention is applied, and the streaming server may temporarily store the bitstream in the process of transmitting or receiving the bitstream.
  • the streaming server transmits multimedia data to a user device based on a user request through a web server, and the web server serves as an intermediary to inform the user of the service.
  • the web server delivers it to the streaming server, and the streaming server transmits multimedia data to the user.
  • the content streaming system may include a separate control server, in which case the control server serves to control commands / responses between devices in the content streaming system.
  • the streaming server may receive content from a media storage and / or encoding server. For example, when content is received from the encoding server, the content may be received in real time. In this case, in order to provide a smooth streaming service, the streaming server may store the bitstream for a predetermined time.
  • Examples of the user device include a mobile phone, a smart phone, a laptop computer, a terminal for digital broadcasting, a personal digital assistants (PDA), a portable multimedia player (PMP), navigation, a slate PC, Tablet PC, ultrabook, wearable device (e.g., smartwatch, smart glass, head mounted display (HMD)), digital TV, desktop Computers, digital signage, and the like.
  • PDA personal digital assistants
  • PMP portable multimedia player
  • slate PC slate PC
  • Tablet PC tablet
  • ultrabook ultrabook
  • wearable device e.g., smartwatch, smart glass, head mounted display (HMD)
  • digital TV desktop Computers, digital signage, and the like.
  • Each server in the content streaming system can be operated as a distributed server, and in this case, data received from each server can be distributed.
  • the embodiments described in the present invention may be implemented and implemented on a processor, microprocessor, controller, or chip.
  • the functional units illustrated in each drawing may be implemented and implemented on a computer, processor, microprocessor, controller, or chip.
  • the decoder and encoder to which the present invention is applied are a multimedia broadcast transmission / reception device, a mobile communication terminal, a home cinema video device, a digital cinema video device, a surveillance camera, a video communication device, a real-time communication device such as video communication, a mobile streaming device, Storage media, camcorders, video-on-demand (VoD) service providers, OTT video (Over the top video) devices, Internet streaming service providers, three-dimensional (3D) video devices, video telephony video devices, and medical video devices. And can be used to process video signals or data signals.
  • the OTT video (Over the top video) device may include a game console, a Blu-ray player, an Internet-connected TV, a home theater system, a smartphone, a tablet PC, and a digital video recorder (DVR).
  • the processing method to which the present invention is applied can be produced in the form of a computer-implemented program, and can be stored in a computer-readable recording medium.
  • Multimedia data having a data structure according to the present invention can also be stored in a computer-readable recording medium.
  • the computer-readable recording medium includes all kinds of storage devices and distributed storage devices in which computer-readable data is stored.
  • the computer-readable recording medium includes, for example, Blu-ray Disc (BD), Universal Serial Bus (USB), ROM, PROM, EPROM, EEPROM, RAM, CD-ROM, magnetic tape, floppy disk and optical. It may include a data storage device.
  • the computer-readable recording medium includes media implemented in the form of a carrier wave (for example, transmission via the Internet).
  • the bitstream generated by the encoding method may be stored in a computer-readable recording medium or transmitted through a wired or wireless communication network.
  • an embodiment of the present invention may be implemented as a computer program product by program code, and the program code may be executed on a computer by an embodiment of the present invention.
  • the program code can be stored on a computer readable carrier.
  • Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
  • one embodiment of the invention includes one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • processors controllers, microcontrollers, microprocessors, and the like.
  • an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above.
  • the software code can be stored in memory and driven by a processor.
  • the memory is located inside or outside the processor, and can exchange data with the processor by various known means.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

La présente invention concerne un procédé de décodage d'un signal vidéo et un dispositif associé. Plus particulièrement, un procédé de décodage d'une image basé sur un mode de prédiction intra peut comprendre les étapes consistant : à acquérir un indicateur de mode le plus probable (MPM) indiquant si le MPM est appliqué au bloc actuel, le MPM représentant un mode dans lequel un mode de prédiction intra du bloc actuel est dérivé d'un bloc intra-prédit autour du bloc actuel; lorsque le MPM est appliqué au bloc actuel, à former une liste MPM sur la base de modes de prédiction intra des blocs voisins se trouvant à gauche et au-dessus du bloc actuel; à acquérir un indice MPM indiquant un mode de prédiction intra particulier dans la liste MPM; et à générer un bloc de prédiction destiné au bloc actuel à l'aide d'un mode de prédiction intra spécifié par l'indice MPM.
PCT/KR2019/011588 2018-09-06 2019-09-06 Procédé de traitement d'image basé sur un mode de prédiction intra et dispositif associé WO2020050697A1 (fr)

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