CN110024386A - Method and apparatus for being encoded/decoded to image, for the recording medium of stored bits stream - Google Patents
Method and apparatus for being encoded/decoded to image, for the recording medium of stored bits stream Download PDFInfo
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- CN110024386A CN110024386A CN201780073904.9A CN201780073904A CN110024386A CN 110024386 A CN110024386 A CN 110024386A CN 201780073904 A CN201780073904 A CN 201780073904A CN 110024386 A CN110024386 A CN 110024386A
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Abstract
The present invention relates to a kind of methods and apparatus for encoding/decoding to image.Method according to the present invention for being decoded to image is comprising steps of be divided into one or more sub-blocks for current block；The intra prediction mode of each of one or more sub-block sub-block is derived using at least one of the intra prediction mode of current block and the intra prediction mode of contiguous block adjacent with current block；Intra prediction is executed to each of one or more sub-block sub-block using the intra prediction mode derived.
Description
Technical field
The present invention relates to a kind of methods and apparatus for encoding/decoding to image.In particular it relates to one
Kind of the method and apparatus that image is encoded/decoded using intra prediction and storage by image encoding method of the invention/
The recording medium for the bit stream that equipment generates.
Background technique
Recently, for high-resolution and high quality graphic (such as, fine definition (HD) image and ultrahigh resolution (UHD)
Image) demand increase in various application fields.However, the image data of higher resolution and quality and traditional images number
Data volume is increased according to comparing.Therefore, when the medium transmission picture number by using such as traditional wire and wireless broadband network
According to when, or when by using conventional storage media store image data when, the increased costs of transimission and storage.In order to solve with
The resolution ratio and Quality advance and these problems for occurring of image data, need a kind of for higher resolution and higher quality
Image efficient image coding/decoding technology.
Image Compression includes various technologies, and the various technologies include: from the previous picture of current picture or subsequent
Picture is to including inter-frame prediction techniques that the pixel value in current picture is predicted；By using the pixel in current picture
Information is to including infra-prediction techniques that the pixel value in current picture is predicted；It is carried out for the energy to residual signals
The transform and quantization technology of compression；Short code is distributed into the value with the high frequency of occurrences and distributes to long code with low appearance frequency
The entropy coding of the value of rate；Etc..Image data can be effectively incompressible by using such Image Compression, and
It can be transmitted or store.
Summary of the invention
Technical problem
The object of the present invention is to provide a kind of method for being coded and decoded image to improve compression efficiency
The recording medium of the bit stream generated with equipment and storage by image encoding method of the invention/equipment.
It is of the invention that another the goal is to provide a kind of is coded and decoded to image using intra prediction to improve pressure
The recording medium for the bit stream that the method and apparatus of contracting efficiency and storage are generated by image encoding method of the invention/equipment.
It is of the invention it is another the goal is to provide it is a kind of using transformation model, etc. spatial models or bilinear interpolation model hold
Row intra prediction is come the method and apparatus that is coded and decoded to image and storage by image encoding method of the invention/set
The recording medium of the standby bit stream generated.
Technical solution
A kind of picture decoding method according to the present invention can include: by current block subregion be one or more sub-blocks；It is logical
It crosses and is come using at least one of the intra prediction mode of current block and intra prediction mode of contiguous block adjacent with current block
Derive the intra prediction mode of each of one or more sub-block sub-block；And by using in the frame derived
Prediction mode executes intra prediction to each of one or more sub-block sub-block.
In picture decoding method according to the present invention, the step of deriving intra prediction mode can include: by using working as
At least one of intra prediction mode of preceding piece of intra prediction mode and contiguous block is pre- in the frame for current block to generate
It surveys direction field (IPDF)；And each of one or more sub-block is derived by using the IPDF of generation
The intra prediction mode of block.
In picture decoding method according to the present invention, transformation model can be used to generate IPDF, and transformation model can wrap
Include at least one of rigid body translation, similarity transformation, affine transformation, homography conversion and 3D transformation.
In picture decoding method according to the present invention, the intra prediction of the contiguous block used in the step of generating IPDF
Mode can be the seed point intra prediction mode (SPIPM) of the seed block including seed point, and can be based on current block or son
The size or shape of block adaptively determines seed point.
In picture decoding method according to the present invention, the list of SPIPM can configure, wherein the list of SPIPM includes making
For the intra prediction mode of the contiguous block of SPIPM candidate, and can be according to the quantity of SPIPM needed for generating IPDF from SPIPM
List in select SPIPM.
In picture decoding method according to the present invention, in contiguous block, intra prediction has been derived using IPDF when existing
When the contiguous block of mode, the IPDF of current block can be generated based on the IPDF of the contiguous block.
In picture decoding method according to the present invention, the intra prediction mode of contiguous block can be used to derive and be located at currently
The intra prediction mode of the outermost sub-block positioned at current block can be used for the intra prediction mode of the outermost sub-block of block
The intra prediction mode of at least one remaining sub-block is derived, and the outermost sub-block for spatially deriving and being located at current block can be waited
In two sub-blocks intra prediction mode and remaining sub-block intra prediction mode.
In picture decoding method according to the present invention, the intra prediction mode of contiguous block can be used to derive and be located at currently
The intra prediction mode of the outermost sub-block positioned at current block can be used for the intra prediction mode of the outermost sub-block of block
The intra prediction mode of at least one remaining sub-block is derived, and two in the outermost sub-block of current block can be passed through
The bilinear interpolation of the intra prediction mode of sub-block derives the intra prediction mode of remaining sub-block.
A kind of image decoding apparatus according to the present invention may include intraprediction unit, and intraprediction unit is configured as:
It is one or more sub-blocks by current block subregion；Intra prediction mode and the neighbour adjacent with current block by using current block
In frame of at least one of the intra prediction mode of nearly block to derive each of one or more sub-block sub-block
Prediction mode；And each of one or more sub-block sub-block is held by using the intra prediction mode of derivation
Row intra prediction.
A kind of image encoding method according to the present invention can include: by current block subregion be one or more sub-blocks；It is logical
It crosses and is come using at least one of the intra prediction mode of current block and intra prediction mode of contiguous block adjacent with current block
Determine the intra prediction mode of each of one or more sub-block sub-block；And by using pre- in determining frame
Survey mode executes intra prediction to each of one or more sub-block sub-block.
In image encoding method according to the present invention, the step of determining intra prediction mode can include: by using working as
At least one of intra prediction mode of preceding piece of intra prediction mode and contiguous block is pre- in the frame for current block to generate
It surveys direction field (IPDF)；And each of one or more sub-block is determined by using the IPDF of generation
The intra prediction mode of block.
In image encoding method according to the present invention, transformation model can be used to generate IPDF, and transformation model can wrap
Include at least one of rigid body translation, similarity transformation, affine transformation, homography conversion and 3D transformation.
In image encoding method according to the present invention, the intra prediction of the contiguous block used in the step of generating IPDF
Mode can be the seed point intra prediction mode (SPIPM) of the seed block including seed point, and can be based on current block or son
The size or shape of block adaptively determines seed point.
In image encoding method according to the present invention, the list of SPIPM can configure, wherein the list of SPIPM includes making
For the intra prediction mode of the contiguous block of SPIPM candidate, and can be according to the quantity of SPIPM needed for generating IPDF from SPIPM
List in select SPIPM.
In image encoding method according to the present invention, in contiguous block, intra prediction has been derived using IPDF when existing
When the contiguous block of mode, the IPDF of current block can be generated based on the IPDF of the contiguous block.
In image encoding method according to the present invention, the intra prediction mode of contiguous block can be used to determine and be located at currently
The intra prediction mode of the outermost sub-block positioned at current block can be used for the intra prediction mode of the outermost sub-block of block
It determines the intra prediction mode of at least one remaining sub-block, and the outermost sub-block for spatially determining and being located at current block can be waited
In two sub-blocks intra prediction mode and remaining sub-block intra prediction mode.
In image encoding method according to the present invention, the intra prediction mode of contiguous block can be used to determine and be located at currently
The intra prediction mode of the outermost sub-block positioned at current block can be used for the intra prediction mode of the outermost sub-block of block
It determines the intra prediction mode of at least one remaining sub-block, and two in the outermost sub-block of current block can be passed through
The bilinear interpolation of the intra prediction mode of sub-block determines the intra prediction mode of remaining sub-block.
A kind of image encoding apparatus according to the present invention may include intraprediction unit, and intraprediction unit is configured as:
It is one or more sub-blocks by current block subregion；Intra prediction mode and the neighbour adjacent with current block by using current block
In frame of at least one of the intra prediction mode of nearly block to determine each of one or more sub-block sub-block
Prediction mode；And each of one or more sub-block sub-block is held by using determining intra prediction mode
Row intra prediction.
A kind of computer readable recording medium according to the present invention can be stored by image encoding method generation of the invention
Bit stream.
Beneficial effect
According to the present invention, it is possible to provide a kind of image coding/decoding method for improving compression efficiency and equipment and storage
By the recording medium for the bit stream that image encoding method of the invention/equipment generates.
And according to the present invention, it is possible to provide a kind of encoding/decoding image using intra prediction for improving compression efficiency
The recording medium for the bit stream that method and apparatus and storage are generated by image encoding method of the invention/equipment.
And according to the present invention, it is possible to provide it is a kind of using transformation model, etc. spatial models or bilinear interpolation model execute
The ratio that the image coding/decoding method and equipment of intra prediction and storage are generated by image encoding method of the invention/equipment
The recording medium of spy's stream.
Detailed description of the invention
Fig. 1 is the block diagram for showing the configuration of encoding device of embodiment according to the present invention.
Fig. 2 is the block diagram for showing the configuration of decoding device of embodiment according to the present invention.
Fig. 3 is the diagram for schematically showing the partitioned organization of image when coding and decoding to image.
Fig. 4 is the diagram for showing intra-prediction process.
Fig. 5 is the diagram for showing the method that intra prediction is executed to current block of embodiment according to the present invention.
Fig. 6 is the diagram for showing the embodiment for the intra prediction mode that current block is derived using SPIPM.
Fig. 7 is the diagram for showing the embodiment of SPIPM list of the construction including two SPIPM.
Fig. 8 is the exemplary diagram for showing the embodiment of SPIPM list of the construction including three SPIPM.
Fig. 9 is the exemplary diagram for showing the embodiment of SPIPM list of the construction including four SPIPM.
Figure 10 be show current block size be the sub-block size in the case where 16 × 16 exemplary diagram.
Figure 11 is the diagram for showing the embodiment using determining IPDF distribution intra prediction mode.
Figure 12 is the exemplary diagram for showing the reconstructed block neighbouring with current block.
Figure 13 is the diagram for showing the embodiment that intra prediction mode is derived using neighbouring reconstructed block.
Figure 14 is the diagram for showing the embodiment for deriving the intra prediction mode based on sub-block.
Figure 15 is the diagram for showing another embodiment for deriving the intra prediction mode based on sub-block.
Figure 16 is the exemplary diagram for showing the neighbouring reconstruction sampling point line for the intra prediction that can be used for current block.
Figure 17 is to show for including the sub-block in current block to construct the diagram of the embodiment with reference to sampling point.
Figure 18 is the diagram shown using that can replace the unavailable method for rebuilding sampling point with reconstruction sampling point.
Figure 19 is the exemplary diagram for showing the intra prediction of the shape according to current block.
Specific embodiment
Invention mode
A variety of modifications can be made to the present invention, and there are various embodiments of the invention, wherein now with reference to attached drawing
The examples of the embodiments are provided and will be described in the examples of the embodiments.However, the invention is not limited thereto, and show
Example property embodiment can be interpreted as including all modifications, equivalent form or replacement in technical concept and technical scope of the invention
Form.Similar reference label refers to the same or similar function in all respects.In the accompanying drawings, for the sake of clarity, the shape of element
Shape and size can be exaggerated.In the following detailed description of the invention, to shown by way of diagram can to the present invention carry out
The attached drawing of the specific embodiment of implementation carries out reference.These embodiments are described in enough detail so that those skilled in the art's energy
Enough implement the disclosure.It should be understood that the various embodiments of the disclosure need not be mutually exclusive although difference.For example, not
In the case where being detached from spirit and scope of the present disclosure, described herein and the associated special characteristic of one embodiment, structure and spy
Property can be carried out in other embodiments.Moreover, it should be understood that without departing from the spirit and scope of the disclosure, often
The position of each element in a disclosed embodiment or arrangement can be modified.Therefore, described in detail below will be not with limitation
Meaning carries out, and the scope of the present disclosure only (in the case where suitable explain, is also wanted together with claim by appended claims
Seek the full scope of the equivalent of protection) it limits.
Term " first " used in the description, " second " etc. can be used for describing various assemblies, but these components are simultaneously
It is not construed as limited to the term.The term is only applied to distinguish a component with another component.For example, not
In the case where departing from the scope of the present invention, " first " component is referred to alternatively as " second " component, and " second " component can also be by class
As be known as " first " component.Term "and/or" include multiple combination or multiple items in any one.
It will be appreciated that in the present specification, be referred to simply as " being connected to " or " being integrated to " another element when element and
When not being " being directly connected to " or " being bonded directly to " another element, the element " can be directly connected to " or " bind directly
To " another element, or another element is connected to or is integrated in the case where being inserted into other elements therebetween.On the contrary, should
Understand, when element, which is referred to as " binding directly " or " being directly connected to ", arrives another element, intermediary element is not present.
In addition, the building block shown in an embodiment of the present invention is shown separately, so that spy different from each other is presented
Sexual function.Therefore, this is not meant to that each building block is configured with the component units of individual hardware or software.In other words
It says, for convenience, each building block includes each of the building block enumerated.Therefore, in each building block extremely
Few two building blocks, which can be combined to form a building block or a building block, can be divided into multiple building blocks
To execute each function.It is no be detached from essence of the invention in the case where, embodiment that each building block is combined and
One divided embodiment of building block is also included in the scope of the present invention.
The term used in the present specification is only used for description specific embodiment, is not intended to limit the invention.With odd number
The expression used includes plural number expression, unless it has visibly different meaning within a context.In the present specification, it will manage
Solution, the term of " including ... ", " having ... " etc. be intended to indicate feature disclosed in the description, quantity, step,
Behavior, component, assembly unit, or combinations thereof presence, and be not intended to exclude one or more other features, quantity, step, row
For, component, assembly unit, or combinations thereof there may be or a possibility that may be added.In other words, when particular element is referred to as
When " by including ", the element in addition to respective element is not excluded, but, element in addition can be included in reality of the invention
It applies in example or the scope of the present invention.
In addition, some constituent element may not be the indispensable building block for executing necessary function of the invention, but
Only promote the optional building block of its performance.It can be by only including substantive indispensable building block for carrying out the present invention
Without including implementing the present invention for the building block of improving performance.It only include the indispensable building block without including
The structure for being only used for the optional building block of improving performance is also included in the scope of the present invention.
Hereinafter, it will be described in detail with reference to the accompanying drawings the embodiment of the present invention.In description exemplary embodiment of the present invention
When, known function or structure will not be discussed in detail, this is because they can unnecessarily be obscured the present invention.In attached drawing
Identical constituent element indicated by identical reference label, and the repeated description of similar elements will be omitted.
In addition, hereinafter, image can mean the picture for constituting video, or can mean video itself.For example, " to figure
As being encoded or decoded or coded and decoded " can mean " video is encoded or is decoded or is carried out coding and
Decoding ", and can mean and " be encoded or decoded or carried out coding reconciliation to an image among the multiple images of video
Code ".Here, picture and image can have the same meaning.
Term description
Encoder: the equipment for executing coding is meant.
Decoder: it means and executes decoded equipment.
Block: for M × N matrix sampling point.Here, M and N means positive integer, and block can mean the sampling point square of two dimensional form
Battle array.Block can indicate unit.Current block can be meant becomes target as the encoding target block of target or upon decoding when encoding
Decoding object block.In addition, current block can be at least one of encoding block, prediction block, residual block and transform block.
Sampling point: being the basic unit for constituting block.It may be expressed as foundation bit-depth (Bd) and range is 0 to 2Bd- 1
Value.In the present invention, sampling point can be used as the meaning of pixel.
Unit: coding and decoding unit is meant.When coding and decoding to image, unit be can be by single
Image carries out subregion and the region that generates.In addition, unit can mean during coding or decoding when single image be partitioned it is more
Sub- division unit when a sub- division unit.When being coded and decoded to image, can be performed for the predetermined of each unit
Processing.One unit can be partitioned smaller subelement of the size than the unit.According to function, unit can mean block,
Macro block, coding tree unit, coding tree block, coding unit, encoding block, predicting unit, prediction block, residual unit, residual block, transformation
Unit, transform block etc..In addition, in order to distinguish unit and block, unit may include luminance component block, related to luminance component block
The chromatic component block of connection and the syntactic element of each color component block.Unit can have various sizes and shape, it is specific and
Speech, the form of unit can be two-dimentional geometric figure, rectangle, square, trapezoidal, triangle, pentagon etc..In addition, single
Metamessage may include cell type (instruction coding unit, predicting unit, converter unit etc.), unit size, unit depth, to list
At least one of sequence that member is coded and decoded etc..
Coding tree unit: single encoded tree block configured with luminance component Y and to two component Cb and Cr relevant two
A coding tree block.In addition, its can indicate include block and each piece syntactic element.Each coding tree unit can be by using four forks
Tree at least one of partition method and binary tree partition method are partitioned, such as coding unit, pre- to configure lower layer unit
Survey unit, converter unit etc..Coding tree unit is used as being decoded/compiling to the image as input picture for specifying
Become the term of the block of pixels of processing unit in code.
Coding tree block: can be used as specify Y coding tree block, Cb coding tree block and Cr coding tree block in any one
Term.
Contiguous block: the block adjacent with current block is meant.The block adjacent with current block can mean the borderless contact with current block
Block or positioned at away from the block within current block preset distance.Contiguous block can mean the block adjacent with the vertex of current block.Here,
The block adjacent with the vertex of current block can mean with the horizontally adjacent contiguous block in current block vertically adjacent to block or with it is vertical
Adjacent to the horizontally adjacent block of the contiguous block of current block.
It rebuilds contiguous block: meaning and be encoded on and the spatially/time adjacent with current block or decoded contiguous block.
Here, it is gratifying for reconstruction adjacent unit to rebuild contiguous block.Rebuilding spatial neighbor block can be in current picture and has led to
It crosses coding or decodes or encodes and decode the reconstructed block of the two.Reconstruction time contiguous block is drawing in reference picture with current
The contiguous block of block or the block of the current block in face at same position.
Unit depth: the degree that unit is partitioned is meant.In tree construction, root node can be highest node, leaf node
It can be minimum node.In addition, grade at unit can mean unit depth when unit is expressed as tree construction.
Bit stream: the bit stream including coded image information is meant.
Parameter set: corresponding to the head information in the configuration of bit stream.Video parameter collection, sequence parameter set, parameter sets
It may include in parameter set at least one parameter set in auto-adaptive parameter set.In addition, parameter set may include band (slice)
Head and parallel block (tile) head information etc..
Parsing: it can mean and determine the value of syntactic element by executing entropy decoding, or can mean entropy decoding itself.
Symbol: at least one in the syntactic element, coding parameter and transform coefficient values of coding/decoding object element can be meant
It is a.In addition, symbol can mean entropy coding target or entropy decoding result.
Predicting unit: it means when execution such as inter-prediction, intra prediction, interframe compensation, the interior compensation of frame and motion compensation
Prediction when basic unit.Single predicting unit can be partitioned multiple subregions of small size, or can be partitioned lower level
Predicting unit.
Predicting unit subregion: it means by way of carrying out subregion acquisition to predicting unit.
Converter unit: it means and is compiled when to residual signals execution such as transformation, inverse transformation, quantization, inverse quantization, transformation coefficient
Basic unit when code/decoded coding/decoding.Single converter unit can be partitioned multiple transformation lists with small size
Member.
Scaling: the processing that Graph One factor is multiplied with transform coefficient levels is meant.It can be by contracting to transform coefficient levels
It puts to generate transformation coefficient.Scaling may be additionally referred to as inverse quantization.
Quantization parameter: the value used during quantization when generating the transform coefficient levels of transformation coefficient can be meant.Quantization
The value that parameter uses when can mean during inverse quantization by zooming in and out to transform coefficient levels and generating transformation coefficient.Quantization ginseng
Number can be mapped to the value of the step sizes of quantization.
Increment (Delta) quantization parameter: the quantization parameter of coding/decoding object element and the quantization parameter predicted are meant
Between difference.
Scanning: the method being ranked up to the coefficient in block or matrix is meant.For example, the coefficient of two-dimensional matrix is changed into
The operation of one-dimensional matrix is referred to alternatively as scanning, and the operation that the coefficient of one-dimensional matrix changes into two-dimensional matrix is referred to alternatively as sweeping
It retouches or inverse scan.
Transformation coefficient: the coefficient value for executing generate after transformation in the encoder can be meant.It can mean in a decoder
Execute the coefficient value generated after at least one of entropy decoding and inverse quantization.By to transformation coefficient or the residual signals amount of progress
The transform coefficient levels for changing the quantification gradation or quantization that obtain can also fall into the meaning of transformation coefficient.
Quantification gradation: the value by carrying out quantization generation to transformation coefficient or residual signals in the encoder is meant.It is optional
Ground is selected, quantification gradation can be meant as in a decoder will be by the inverse quantization mesh target value of inverse quantization.Yearning between lovers, as transformation and
The transform coefficient levels of the quantization of the result of quantization can also fall into the meaning of quantification gradation.
Non-zero transform coefficient: the transformation coefficient with value except zero or the transformation series with value except zero are meant
Number grade.
Quantization matrix: it means in quantification treatment and the inverse quantization processing being performed using to improve main body (subject)
The matrix of picture quality or object (object) picture quality.Quantization matrix also referred to as scales list.
Quantization matrix coefficient: each element in quantization matrix is meant.Quantization matrix coefficient may be additionally referred to as matrix coefficient.
Default matrix: the predetermined quantitative matrix being predefined in the encoder and the decoder is meant.
Non-default matrix: the quantization for not being predefined but being sent by user with signal in the encoder and the decoder is meant
Matrix.
Fig. 1 is the block diagram for showing the configuration according to embodiment and application encoding device of the invention.
Encoding device 100 can be encoder, video encoder or image encoding apparatus.Video may include at least one
Image.Encoding device 100 can sequentially encode at least one image.
Referring to Fig.1, encoding device 100 may include motion prediction unit 111, motion compensation units 112, intraprediction unit
120, switch 115, subtracter 125, converter unit 130, quantifying unit 140, entropy code unit 150, inverse quantization unit 160,
Inverse transformation block 170, adder 175, filter cell 180 and reference picture buffer 190.
Encoding device 100 can be next pair by using frame mode or inter-frame mode or both frame mode and inter-frame mode
Input picture executes coding.In addition, encoding device 100 can generate bit stream by being encoded to input picture, and can be defeated
The bit stream generated out.The bit stream of generation can be stored in computer readable recording medium, or can be passed by wire/wireless
Defeated medium is streamed.When frame mode is used as prediction mode, switch 115 be can switch in frame.Selectively, work as frame
Between mode when being used as prediction mode, switch 115 can switch to inter-frame mode.Here, frame mode can mean intra prediction
Mode, inter-frame mode can mean inter-frame forecast mode.Encoding device 100 can produce the prediction block of the input block of input picture.This
Outside, after generating prediction block, encoding device 100 can encode the residual error of input block and prediction block.Input picture can quilt
The referred to as present image of present encoding target.Input block is referred to alternatively as the current block as present encoding target or can quilt
Referred to as encoding target block.
When prediction mode is frame mode, intraprediction unit 120 can will be encoded/decode and adjacent with current block
Block pixel value be used as reference pixel.Intraprediction unit 120 can usually execute spatial prediction by using reference image, or can
The prediction sampling point of input block is generated by executing spatial prediction.Here, intra prediction can mean in frame-prediction.
When prediction mode is inter-frame mode, motion prediction unit 111 can be searched when executing motion prediction from reference picture
Rope and the most matched region of input block, and motion vector can be derived by using the region searched.Reference picture can be stored
In reference picture buffer 190.
Motion compensation units 112 can execute motion compensation by using motion vector to generate prediction block.Here, interframe is pre-
Survey can mean interframe-prediction or motion compensation.
When the value of motion vector is not integer, motion prediction unit 111 and motion compensation units 112 can be by references
The partial region of picture generates prediction block using interpolation filter.In order to execute inter-prediction or movement benefit to coding unit
It repays, it may be determined that among skip mode, merging patterns, advanced motion-vector prediction (AMVP) mode and current picture reference model
Which mode be used for include predicting unit in corresponding coding unit motion prediction and compensation method.It then, can root
Inter-picture prediction or motion compensation are differently carried out according to determining mode.
Subtracter 125 can generate residual block by using the residual error of input block and prediction block.Residual block is referred to alternatively as residual
Difference signal.Residual signals can mean the difference between original signal and prediction signal.In addition, residual signals can be by original
Difference between signal and prediction signal is converted or is quantified or transform and quantization and the signal that generates.Residual block can be block
The residual signals of unit.
Converter unit 130 can generate transformation coefficient, and the transformation series of exportable generation by executing transformation to residual block
Number.Here, transformation coefficient can be the coefficient value generated and transformation by executing to residual block.When application converts skip mode
When, converter unit 130 can skip the transformation to residual block.
It can be by generating quantification gradation to transformation coefficient or residual signals application quantization.Hereinafter, in embodiment,
Transformation coefficient is referred to alternatively as by the grade of quantization.
Quantifying unit 140 can generate quantification gradation by being quantified according to parameter to transformation coefficient or residual signals,
And the quantification gradation of exportable generation.Here, quantifying unit 140 can be by using quantization matrix come to the transformation coefficient amount of progress
Change.
Entropy code unit 150 can be by by the calculated value of quantifying unit 140 or to calculated when executing coding
Encoded parameter values execution generates bit stream, and the bit stream of exportable generation according to the entropy coding of probability distribution.Entropy coding list
Member 150 can execute entropy coding to the Pixel Information of information and image for being decoded to image.For example, for image into
The decoded information of row may include syntactic element.
When entropy coding is by application, by with the high a small amount of bit of symbol distribution for generating probability and to low yield life
The symbol of probability distributes a large amount of bits to indicate symbol, so as to reduce for by the size of the bit stream for the symbol being encoded.
The coding method for entropy coding, such as Exp-Golomb, context-adaptive variable-length encoding can be used in entropy code unit 150
(CAVLC), context adaptive binary arithmetic coding (CABAC) etc..For example, entropy code unit 150 can be by using elongated
Coding/code (VLC) table executes entropy coding.In addition, entropy code unit 150 can derived object symbol binarization method and mesh
Reference symbol number/binary digit probabilistic model, and can be executed by using the binarization method and context model derived
Arithmetic coding.
In order to encode to transform coefficient levels, entropy code unit 150 can be incited somebody to action by using transformation coefficient scan method
Two-dimensional block form coefficient changes into one-dimensional vector form.
Coding parameter may include such as syntactic element that is encoded in the encoder and being signaled to decoder
Information information (mark, index etc.) and derived when executing coding or decoding.Coding parameter can be meant to carry out when to image
Necessary information when coding or decoding.For example, coding parameter may include at least one of following item value or combining form: single
Member/block size, unit/block depth, unit/block partition information, unit/block partitioned organization, point for whether carrying out quaternary tree form
Area, the subregion for whether carrying out binary tree form, the subregion direction (horizontal direction or vertical direction) of binary tree form, binary tree
The zoned format (symmetric partitioning or asymmetric subregion) of formula, intra prediction mode/direction, with reference to sampling point filtering method, prediction block
Filtering method, prediction block filter tap, prediction block filter coefficient, inter-frame forecast mode, motion information, motion vector, ginseng
Examine picture index, inter-prediction angle, inter-prediction indicator, reference picture list, reference picture, motion vector predictor
Candidate, motion vector candidates list, whether using merging patterns, merge it is candidate, merge candidate list, whether using skipping mould
The essence that formula, interpolation filter type, interpolation filter tap, interpolation filter coefficients, motion vector size, motion vector indicate
Exactness, alternative types, transform size, the letter that main (first) converts the information whether used, whether secondary transformation is used
Information, coded block pattern, the coded block flag that breath, main manipulative indexing, secondary manipulative indexing, residual signals whether there is
(CBF), quantization parameter, quantization matrix, whether using frame loop filter, frame loop filter coefficient, frame inner ring road filter
Whether wave device tap frame loop filter shape/form, applies de-blocking filter, de-blocking filter coefficient, de-blocking filter
Tap, de-blocking filter intensity, de-blocking filter shape/form, whether the adaptive sampling point of application deviates, adaptive sampling point deviates
Value, adaptive sampling point deviate classification, adaptive sampling point offset type, whether using in adaptive in-loop filter, adaptive ring
Filter coefficient, adaptive in-loop filter tap, adaptive in-loop filter shape/form, binaryzation/anti-binaryzation side
Method, context model determine method, context model update method, whether execute general mode, whether execute bypass mode, on
Hereafter binary digit, bypass binary digit, transformation coefficient, transform coefficient levels, transform coefficient levels scan method, image are aobvious
Show/output sequence, stripe identification information, type of strip, band partition information, parallel block identification information, parallel block type, parallel
The information of block partition information, picture type, bit-depth and luminance signal or carrier chrominance signal.
Here, sending mark or index with signal can mean and indicate accordingly or index by encoder entropy coding and be included in
In bit stream, and it can mean corresponding mark or index by decoder the entropy decoding from bit stream.
When encoding device 100 by inter-prediction execute encode when, can by the current picture of coding be used as will by with
The reference picture of another image of post-processing.Therefore, encoding device 100 can be rebuild or be decoded to the current picture of coding,
Can will rebuild or decoded image be stored as reference picture.
Quantification gradation can be in inverse quantization unit 160 by inverse quantization, or can be inversely transformed in inverse transformation block 170.It can
The coefficient of the coefficient or inverse quantization of the coefficient of inverse quantization or inverse transformation and inverse transformation is added with prediction block by adder 175.
By the way that the coefficient of the coefficient of the coefficient of inverse quantization or inverse transformation or inverse quantization and inverse transformation to be added with prediction block, weight can produce
Build block.Here, the coefficient of inverse quantization or the coefficient of inverse transformation or inverse quantization and the coefficient of inverse transformation can mean and perform inverse
Change the coefficient at least one of inverse transformation, and can indicate reconstructive residual error block.
Reconstructed block can pass through filter cell 180.Filter cell 180 can be to reconstructed block or reconstruction picture application deblocking filter
At least one of wave device, sampling point self adaptation skew (SAO) (SAO) and auto-adaptive loop filter (ALF).Filter cell 180 can
Referred to as in-loop filter.
De-blocking filter can remove the block distortion generated in boundary between blocks.In order to determine whether using deblocking filtering
Device can be determined whether based on including the pixel in several row or column in block to current block application de-blocking filter.When going
When blocking filter is applied to block, another filter can be applied according to required deblocking filtering intensity.
It, can be by using sampling point self adaptation skew (SAO) by deviant appropriate and pixel value in order to be compensated to encoding error
It is added.Sampling point self adaptation skew (SAO) can carry out school to the offset between the image and original image after deblocking as unit of pixel
Just.The method that the marginal information for considering each pixel can be used to apply offset, or use following methods: by the pixel of image point
Area is the region of predetermined quantity, is determined the region of application offset, and is deviated to the application of identified region.
Auto-adaptive loop filter can execute filtering based on the reconstruction picture of filtering and the comparison result of raw frames.It can
The pixel partitions being included in image are predetermined group, it may be determined that will be applied to each group of filter, and can be directed to
The different filtering of each group of execution.Whether can be sent by coding unit (CU) with signal using the information of ALF, and will be by
Form and coefficient applied to each piece of ALF is alterable.
It can be stored in reference picture buffer 190 by the reconstructed block or reconstruction image of filter cell 180.Fig. 2
It is the block diagram for showing the configuration according to embodiment and application decoding device of the invention.
Decoding device 200 can be decoder, video decoding apparatus or image decoding apparatus.
Referring to Fig. 2, decoding device 200 may include entropy decoding unit 210, inverse quantization unit 220, inverse transformation block 230, frame
Interior prediction unit 240, motion compensation units 250, adder 255, filter cell 260 and reference picture buffer 270.
Decoding device 200 can receive the bit stream exported from encoding device 100.Decoding device 200 can receive and be stored in meter
Bit stream in calculation machine readable medium recording program performing, or can receive and spread defeated bit stream by wire/wireless transmission medium.Decoding is set
Standby 200 can decode bit stream by using frame mode or inter-frame mode.In addition, decoding device 200 can produce and pass through
Decoding and the reconstruction image that generates can produce decoded image, and exportable reconstruction image or decoded image.
When the prediction mode used in decoding is frame mode, switch can be switched in frame.Selectively, when
When the prediction mode used in decoding is inter-frame mode, switch can be switched to inter-frame mode.
Decoding device 200 can obtain reconstructive residual error block by being decoded to the bit stream of input, and can produce prediction
Block.When reconstructive residual error block and obtained prediction block, decoding device 200 can be by producing reconstructive residual error block and prediction block phase Calais
It is generated as the reconstructed block of decoding target.Decoding object block is referred to alternatively as current block.
Entropy decoding unit 210 can generate symbol by executing entropy decoding to bit stream according to probability distribution.The symbol of generation
It number may include the symbol of quantification gradation form.Here, entropy decoding method can be the inversely processing of the method for above-mentioned entropy coding.
In order to be decoded to transform coefficient levels, entropy decoding unit 210 can be incited somebody to action by using transformation coefficient scan method
One direction vector form coefficient changes into two-dimensional block form.
Quantification gradation can be in inverse quantization unit 220 by inverse quantization, or can be inversely transformed in inverse transformation block 230.Amount
Change grade can be both inverse quantization or inverse transformation or inverse quantization and inverse transformation as a result, and reconstructive residual error can be generated as
Block.Here, inverse quantization unit 220 can be to quantification gradation application quantization matrix.
When frame mode quilt in use, intraprediction unit 240 can generate prediction block by executing spatial prediction,
In, spatial prediction uses the pixel value with adjacent and decoded piece of object block of decoding.
When inter-frame mode quilt in use, motion compensation units 250 can generate prediction block by executing motion compensation,
In, motion compensation uses motion vector and the reference picture being stored in reference picture buffer 270.
Adder 255 can be by generating reconstructed block for reconstructive residual error block and prediction block phase Calais.Filter cell 260 can be right
At least one of reconstructed block or reconstruction image application de-blocking filter, sampling point self adaptation skew (SAO) and auto-adaptive loop filter.
The exportable reconstruction image of filter cell 260.Reconstructed block or reconstruction image can be stored in reference picture buffer 270, and
It can be used when executing inter-prediction.
Fig. 3 is the diagram for schematically showing the partitioned organization of the image when coding and decoding to image.Fig. 3 shows
Example by individual unit subregion for multiple lower layer units is shown to meaning property.
Efficient zoned in order to carry out to image, when coding and decoding, coding unit (CU) can be used.Coding unit can
As the basic unit when being encoded/decoded to image.Image is compiled in addition, coding unit can be used to work as
The unit of code/decoding time zone framing internal schema and inter-frame mode.Coding unit can be the prediction for transformation coefficient, transformation,
The basic unit that quantization, inverse transformation, inverse quantization or coding/decoding are handled.
Referring to Fig. 3, image 300 is by sequential partition in maximum coding unit (LCU), and LCU unit is confirmed as point
Plot structure.Here, it is identical meaning that LCU can be used with coding tree unit (CTU).Unit subregion can be meant to related to unit
The block of connection carries out subregion.In block partition information, it may include the information of unit depth.Depth information can indicate what unit was partitioned
The degree or both that number or unit are partitioned.Individual unit can be according to layer quilt associated with the depth information based on tree construction
Subregion.Each of the lower layer unit that subregion goes out can have depth information.Depth information can be the size for indicating CU
Information, and can be stored in each CU.
Partitioned organization can mean the distribution of the coding unit (CU) in LCU 310.Such distribution can be according to whether by single
A CU subregion is determined for multiple (positive integer equal to or more than 2, including 2,4,8,16 etc.) CU.The CU generated by subregion
Horizontal size and vertical dimension may respectively be the horizontal size of the CU before subregion and the half of vertical dimension, or can basis
The number of subregion be respectively provided with less than subregion before horizontal size and vertical dimension size.CU can be more by recursively subregion
A CU.The subregion of CU can be executed recursively until predefined depth or predefined size.For example, the depth of LCU can be with
It is 0, and the depth of minimum coding unit (SCU) can be predefined depth capacity.Here, as described above, LCU can be tool
There is the coding unit of maximum coding unit size, and SCU can be the coding unit with minimum coding unit size.From
LCU 310 starts subregion, as the horizontal size or vertical dimension or both horizontal size and vertical dimension of CU passes through subregion
When operating and reducing, CU depth increases by 1.
In addition, the information whether CU is partitioned can be indicated by using the partition information of CU.Partition information can be 1 ratio
Special information.All CU in addition to SCU may include partition information.For example, CU can not be partitioned when the value of partition information is 1,
When the value of partition information is 2, CU can be partitioned.
It can be 64 × 64 pieces referring to Fig. 3, the LCU with depth 0.0 can be minimum-depth.SCU with depth 3 can
To be 8 × 8 pieces.3 can be depth capacity.32 × 32 pieces and 16 × 16 pieces of CU can be respectively expressed as depth 1 and depth 2.
For example, when single encoded unit is partitioned four coding units, the coding unit of four subregions out
Horizontal size and vertical dimension can be the horizontal size of the CU before subregion and a half-size scale of vertical dimension.Implement at one
In example, when the coding unit with 32 × 32 sizes is partitioned four coding units, the coding list of four subregions out
Each of member can have 16 × 16 sizes.When single encoded unit is partitioned four coding units, can claim to encode
Unit can be partitioned quaternary tree form.
For example, when single encoded unit is partitioned two coding units, the horizontal size of described two coding units
Or vertical dimension can be the horizontal size of the coding unit before subregion or the half of vertical dimension.For example, when have 32 ×
When the coding unit of 32 sizes is partitioned according to vertical direction, each of the coding unit that two subregions go out can have 16 ×
32 size.When single encoded unit is partitioned two coding units, coding unit can be claimed to be partitioned binary tree
Formula.The LCU 320 of Fig. 3 is the example of the LCU of both the subregion for applying quaternary tree form and the subregion of binary tree form.
Fig. 4 is the diagram for showing intra-prediction process.
Intra prediction mode can be non-angled mode or angle mode.Non-angled mode can be DC mode or plane mould
Formula, angle mode can be the prediction mode with specific direction or angle.Intra prediction mode can be by MODE NUMBER, mode
The expression of at least one of value, mode number and pattern angles.The quantity of intra prediction mode can be M and non-side including 1
To sexual norm and directional mode.
The quantity of intra prediction mode can be fixed to N regardless of block size.Selectively, the quantity of intra prediction mode
It can change according to block size or color component type or both block size and color component type.For example, with block size
Become larger, the quantity of intra prediction mode can increase.Selectively, the quantity of the intra prediction mode of luminance component block can be greater than color
Spend the quantity of the intra prediction mode of component blocks.
In order to carry out intra prediction to current block, whether executable determination includes that can be used as in the sampling point rebuild in contiguous block
The step of reference sampling point of current block.When exist be not available as current block the sampling point of reference sampling point when, by be included in weight
At least one sample value built in the sampling point in contiguous block is replicated or is executed interpolation or replicated and executed interpolation two
Person and the value obtained can be used for the not available sample value for replacing sampling point, and the sample value replaced as a result, is used as current block
With reference to sampling point.
When intra prediction, filter can be applied to reference to sampling point based on intra prediction mode and current block size and
Predict at least one of sampling point.
In the case where plane mode, when generating the prediction block of current block, according to prediction target sampling point in prediction block
Position, sampling point can be referred to reference to the upper right side of sampling point and current sample and lower left side by using the upper left side of current sample
Weighted sum come generate prediction target sampling point sample value.In addition, in the case where DC mode, when the prediction block for generating current block
When, the upside of current block and the average value of left side reference sampling point can be used.In addition, in the case where angle mode, it can be by making
Prediction block is generated with reference to sampling point with the upside of current block, left side, upper right side and/or lower left side.In order to generate prediction sample value,
The interpolation of executable real number unit.
It can be predicted by the intra prediction mode to the block adjacent with current block come the intra prediction mould to current block
Formula carries out entropy coding/entropy decoding.When current block is identical with the intra prediction mode of contiguous block, can be believed by using predetermined flag
Breath sends the identical information of intra prediction mode of current block and contiguous block with signal.In addition, available signal transmission is multiple neighbouring
The indicator information of intra prediction mode identical with the intra prediction mode of current block in the intra prediction mode of block.When working as
Preceding piece it is different with the intra prediction mode of contiguous block when, can pass through the intra prediction mode based on contiguous block execute entropy coding/entropy
Decoding to carry out entropy coding/entropy decoding to the intraprediction mode information of current block.
Fig. 5 is the diagram for showing the method that intra prediction is executed to current block of embodiment according to the present invention.
As shown in Figure 5, intra prediction may include that intra prediction mode derives step S510, with reference to sampling point configuration step
S520 and/or intra prediction execute step S530.
It is derived in step S510 in intra prediction mode, it is current to derive that at least one method in following methods can be used
The intra prediction mode of block: it is solved using the method for the intra prediction mode of contiguous block, to the intra prediction mode of current block
The method of code (for example, entropy decoding), using contiguous block coding parameter method, use the intra prediction mode of color component
Method and/or the method for using the intra prediction mode using transformation model.
It, can intra prediction mode by using contiguous block, neighbour in the method using the intra prediction mode of contiguous block
In the combination of one or more intra prediction modes of nearly block and/or the intra prediction mode derived by using MPM extremely
The intra prediction mode for lacking one to derive current block.
In the method using the intra prediction mode using transformation model, rigid body translation, similarity transformation, affine transformation
It can be used to determine the intra prediction mode of the sub-block in current block at least one of homography conversion.
Selectively, in the method using the intra prediction mode using transformation model, spatial models and bilinearity are waited
At least one of filter mode can be used to determine the intra prediction mode of the sub-block in current block.
In reference sampling point configuration step S520, it can be performed with reference to sampling point selection step and/or refer to sampling point filter step,
So that can be configured with reference to sampling point.
It, can be according to son in the step of configuring the reference sampling point of the sub-block in current block in reference sampling point selection step
Block scan method (raster scanning, zigzag scanning, vertical scanning etc.) is differently selected with reference to sampling point.
Intra prediction execute step S530, non-directional prediction, directional prediction, the prediction based on location information and/
Or at least one method in the prediction between color component can be used for the intra prediction for executing current block.It is held in intra prediction
The filtering for prediction sampling point can be performed in row step S530.
Hereinafter, will be described in intra prediction mode derives step S510.
The contiguous block of current block can be in lower left side, left side, upper left side and the upper right side contiguous block of current block at least
One.In contiguous block, the contiguous block that intra prediction mode only can be used can be used.
In the contiguous block of current block, the intra prediction mode of the contiguous block in specific position can be derived as current block
Intra prediction mode.
Selectively, two or more contiguous blocks are selected, it can be by the statistics of the intra prediction mode of the contiguous block of selection
Value is derived as the intra prediction mode of current block.It can be indicated by least one of MODE NUMBER, mode value and pattern angles
Intra prediction mode.In the description, statistical value can be minimum value, maximum value, average value, weighted average, mode and in
At least one of value.
It can be the block in predefined fixed position in the contiguous block of specific position and/or the contiguous block of selection.It is optional
Ground is selected, block can be specified with the information that signal is sent based on by bit stream.
When using at least two intra prediction modes, it is contemplated that it is also non-direction that intra prediction mode, which has directionality,
Property.For example, directional intra prediction mode can be used to derive the frame of current block in two or more intra prediction modes
Inner estimation mode.Selectively, non-directional intra prediction mode can be used to derive the intra prediction mode of current block.
When weighted average is used as statistical value, relatively high weight distribution can be given to specific intra prediction mode.It is special
Framing inner estimation mode can be such as at least one of vertical mode, horizontal pattern, diagonal pattern, non-directional mode.
Selectively, the information about specific intra prediction mode can be sent by bit stream signal.Specific intra prediction mode
Each weight can be same or different to each other.Selectively, weight can be determined based on the size of contiguous block.For example, can will be relatively high
Weight distribution give relatively large contiguous block intra prediction mode.
MPM (most probable mode) can be used to derive the intra prediction mode of current block.
When using MPM, it can be configured using the N number of intra prediction mode derived using the intra prediction mode of contiguous block
MPM list.N is positive integer, and can have size and/or shape according to current block and different values.Selectively, can pass through
Bit stream sends the information about N with signal.
It may include that intra prediction mode in MPM list can be the lower left side of current block, left side, upper left side, upside
And/or the intra prediction mode of upper right side contiguous block.In addition, non-directional mode may include in MPM list.Intra prediction mould
Formula can be included in MPM list according to predetermined order.Predetermined order can be the mould of the mode, upper block of such as lower-left lateral mass
Formula, plane mode, DC mode, the mode of lower-left lateral mass, the sequence of the mode of the mode of upper right lateral mass and upper left lateral mass.It may be selected
Ground, predetermined order can be the mode of left side block, the mode of upper block, plane mode, DC mode, the mode of lower-left lateral mass, the right side
The sequence of the mode of the mode and upper left lateral mass of upper block.
MPM list can be configured to not include replication mode.When the quantity for including intra prediction mode in MPM list
It can include in MPM list by additional intraprediction mode when less than N.Additional intraprediction mode can be and be included in MPM
The corresponding mode of+k ,-k of directional intra prediction mode in list.It can be by the specified integer equal to or more than one of k.It is optional
With selecting, in horizontal pattern, vertical mode and diagonal pattern (45 degree of angle mould formulas, 135 degree of angle mould formulas and 225 degree of angle mould formulas) at least
One may include in MPM list.Selectively, the statistical value of at least one intra prediction mode of contiguous block can be used for pushing away
Lead the intra prediction mode being included in MPM list.
Several MPM lists may be present, and several MPM lists can be configured according to distinct methods.It is included in each MPM list
In intra prediction mode can not repeat.
It can send whether the intra prediction mode of instruction current block includes the letter in MPM list by bit stream signal
It ceases (for example, flag information).When there are N number of MPM list, N flag information may be present.It can be according to for N number of MPM list
Sequence whether there is in MPM list to execute the intra prediction mode of determining current block.Selectively, available signal transmission refers to
Show the information of the MPM list of the intra prediction mode including current block in N number of MPM list.
When the intra prediction mode of current block includes in MPM list, can be sent by bit stream signal for referring to
It surely include the index information of which mode in the mode in MPM list.It selectively, can be by MPM list in certain bits
The mode for setting (for example, first) is derived as the intra prediction mode of current block.
In the step of configuring MPM list, a MPM list can be configured for predetermined size block.When predetermined size block quilt
When subregion is several sub-blocks, the MPM list of configuration is can be used in each of several sub-blocks.
Selectively, the intra prediction mode of contiguous block and the intra prediction mould using the MPM current block derived can be used
At least one of formula derives the intra prediction mode of current block.
For example, when the intra prediction mode of the current block derived using MPM is Pred_mpm, by using contiguous block
Pred_mpm is changed into preassigned pattern by least one intra prediction mode, so that the intra prediction mode of current block can be pushed away
It leads.For example, can be by the way that the size of Pred_mpm and the intra prediction mode of contiguous block be compared to increase Pred_mpm
Or reduce N.Here, N can be predetermined integers, such as ,+1 ,+2 ,+3,0, -1, -2, -3 etc..
Selectively, when one in the mode of Pred_mpm and contiguous block is non-directional mode and the other is side
When to sexual norm, non-directional mode can be derived as to the intra prediction mode of current block, or directional mode can be derived
For the intra prediction mode of current block.
The intra prediction mode of another color component can be used to derive the intra prediction mode of current block.For example, working as
Preceding piece when being chrominance block, the intra prediction mode of at least one associated luminance block corresponding with colorimetric targets block can be used for deriving
The intra prediction mode of chrominance block.It here, can at least one of position, size, shape or coding parameter based on chrominance block
To determine associated luminance block.Selectively, it can be determined based at least one of the size of luminance block, shape or coding parameter
Associated luminance block.
Usable includes the luminance block of sampling point corresponding with the center of chrominance block, or use respectively includes and coloration
At least two luminance blocks of the corresponding sampling point at least two positions of block, to determine associated luminance block.At least two position
It may include upper left sampling point position and center sampling point position.
When there are several associated luminance blocks, the statistical value of the intra prediction mode of at least two associated luminance blocks can be pushed away
Lead the intra prediction mode for chrominance block.Selectively, the intra prediction mode of relatively large associated luminance block can be derived as
The intra prediction mode of chrominance block.Selectively, when the size of luminance block corresponding with the predetermined position of chrominance block is equal to or greatly
When the size of chrominance block, the intra prediction mode of associated luminance block can be used to derive the intra prediction mode of chrominance block.
For example, at least one for deriving the intra prediction mode of current block can be used when current block is partitioned sub-block
Method derives the intra prediction mode of each of the sub-block sub-block that subregion goes out.
In the step of deriving intra prediction mode, current block can be divided into multiple sub-blocks less than current block, and with
The intra prediction mode of each sub-block can be derived afterwards.Here, intra prediction mode can indicate intra prediction direction.Intra prediction mould
Formula may include in the set of predefined intra prediction mode in the encoder and the decoder.
/ decoded piece is encoded by using intra prediction with the neighbouring reconstructed block of current block for example, can be used
At least one of intra prediction mode and the intra prediction mode of current block generate the intra prediction direction of current block
Field (IPDF).Predetermined map model can be used for generating IPDF.After IPDF is generated, IPDF can be used to determine current block
Each sub-block intra prediction mode.
In addition, similar to above example, if current block from bigger than current block or more low depth block is divided, currently
Block can be bigger or more low depth block sub-block.In this case, it can be used and or more low depth block bigger than current block
At least one of being encoded by intra prediction in neighbouring reconstructed block/decoded piece intra prediction mode derives
The intra prediction mode of current block.The intra prediction mode of current block can be derived by generating IPDF.
As predetermined map model, rigid body translation, similarity transformation, affine transformation, homography conversion, 3D transformation can be used
With it is other transformation at least one of.Homography conversion can be perspective transform.
/ decoded piece is encoded by using intra prediction with current block neighbouring reconstructed block due to can be used
The intra prediction mode of at least one of intra prediction mode and current block come derive from current block divide each sub-block
Intra prediction mode, therefore can reduce entropy coding/entropy decoding is carried out to the intra prediction mode of each sub-block needed for bit number.
The size (granularity) of sub-block may be less than or equal to the size of current block.For example, if the size of current block is M × N
(M be positive integer with N), then the size of sub-block can be M/K × N/L.K and M can be positive integer, and L can be the positive divisor of N.
In addition, M/K or N/L can be positive integer.
In addition, P sub-block may be present in current block.P can be 0 or positive integer.For example, 1,2,4 or 16 sub-block can
It is present in current block.
In addition, can not individually whether be had been divided instruction current block for sub-block when current block is divided into sub-block
Information carries out entropy coding/entropy decoding.The information that whether can be derived based on sub-block based on the intra prediction mode of instruction current block
To determine whether current block has been divided as sub-block.
Further, since using encoded/decoded by using intra prediction in the reconstructed block neighbouring with current block
The intra prediction mode of at least one of intra prediction mode of block and current block derives the intra prediction mode of sub-block,
Therefore entropy coding/entropy decoding can not be carried out to the intra prediction mode of sub-block.However, can be carried out to the intra prediction mode of current block
Entropy coding/entropy decoding.Especially, if current block is constructed by a sub-block, can not intra prediction mode to current block into
Row entropy coding/entropy decoding, and can be used and be encoded/decoded piece with the intra prediction that passed through in the neighbouring reconstructed block of current block
At least one of intra prediction mode derive the intra prediction mode of current block.
With current block in neighbouring reconstructed block by using intra prediction be encoded/decoded piece (for IPDF produce
It is raw) it is referred to alternatively as seed block (seed block).The position of seed block is referred to alternatively as seed point (seedpoint).Including seed
The intra prediction mode that the seed block of point has is referred to alternatively as seed point intra prediction mode (SPIPM).
Fig. 6 is the diagram for showing the embodiment for the intra prediction mode that current block is derived using SPIPM.
In the example being shown in FIG. 6, the size of current block can be 16 × 16, and the size of each sub-block can be (16/
4)×(16/4).Here, seed block can be at least one passed through in intra prediction multiple contiguous blocks encoded/decoded
It is a.Seed block or seed point can be the fixation position relative to current block.Alternatively, can be by upside, left side, upper left side, lower-left
Side and at least one of upper right lateral mass or position are determined as seed block or seed point.
For example, the intra prediction mode of at least one of upside contiguous block c, d, e, f and g of current block can be used as
SPIPM.Alternatively, the intra prediction mode of the upper right lateral mass h neighbouring with current block can be used as SPIPM.Alternatively, can will with it is current
The intra prediction mode of at least one of block neighbouring upper left lateral mass a and b are used as SPIPM.Alternatively, can will be neighbouring with current block
The intra prediction mode of at least one of left side block i, j, k and l be used as SPIPM.Alternatively, can be by a left side neighbouring with current block
The intra prediction mode of lower lateral mass m is used as SPIPM.For example, the intra prediction mode of current block can also be used as SPIPM.
The SPIPM of one or more seed points can be used to generate IPDF.
For example, if the coordinate of multiple seed points of the parameter for determining predetermined map model is (x_sp, y_sp) (sp
=1,2,3 ...), and the SPIPM of the seed block including seed point be mode_sp (sp=1,2,3 ...), then can will convert it
The coordinate (x_sp ', y_sp ') of seed point is determined as (x_sp ', y_sp ')=(x_sp+dx, y_sp+dy) afterwards.Here, dx can table
Show the displacement of x-axis direction, dy can indicate the displacement in y-axis direction.Furthermore, it may be determined that dx=D_sub*cos Θ and dy=D_
sub*sinΘ。
Here, Θ can be determined according to SPIPM.For example, if intra prediction mode is directional mode as shown in Figure 6,
Then each SPIPM can have unique direction, and can will be determined as Θ for the positive-angle of x-axis.
For example, for vertical intra prediction mode, Θ=270 °.For example, for horizontal intra prediction mode, Θ=0 °.
For example, for diagonal down-left intra prediction mode, Θ=225 °.For example, intra prediction mode diagonal for upper right, Θ=45 °.
For example, for lower-right diagonal position intra prediction mode, Θ=135 °.
Here, for not having the intra prediction mode of directionality, Θ can be determined as by such as DC mode or plane mode
Particular value.Particular value can be such as 0,90,180 or 270 degree.
SPIPM can indicate the directionality relative to seed point, and D_sub can indicate the size for having directive vector.It can
The size of D_sub is determined according to the size and/or shape of seed block belonging to seed point.In addition, D_sub can be for each
Intra prediction mode has fixed value P.Here, P can be 0 or integer.For example, if the size of current block is M × N (M and N
Positive integer) and D_cur=S (S is positive integer), then can by the D_sub of K × L sub-block (K be positive integer with L) (sub=1,
2,3 ...) it is determined as D_sub=S* (K × L)/(M × N).For example, if the size of current block is 16 × 16, D_ in Fig. 6
Cur=S and the D_sub that can determine seed block at least one of in accordance with the following methods.
For example, for seed block d or e, it may be determined that D_sub=S* (4 × 8)/(16 × 16)=S/8.For example, for seed
Block g or j, it may be determined that D_sub=S* (8 × 8)/(16 × 16)=S/4.For example, for seed block k or l, it may be determined that D_sub=
S* (8 × 4)/(16 × 16)=S/8.For example, for seed block m or h, it may be determined that D_sub=S* (16 × 16)/(16 × 16)=
S.For example, D_sub can be determined as S for each seed block.
Candidate can be configured by construction SPIPM list, the generation of the IPDF for current block.The neighbour of current block can be used
The intra prediction mode of at least one of nearly block generates SPIPM list.For example, SPIPM can be the upper left side of current block
(SPIPM_TL), one in upper right side (SPIPM_TR), lower left side (SPIPM_BL) and lower right side (SPIPM_BR) SPIPM or
The set of more.For W × H current block, SPIPM_TL can have upside, the upper left side of the position (0,0) for current block
With at least one of the intra prediction mode of left side contiguous block as candidate.SPIPM_TR can have the position for current block
At least one of the upside of (W-1,0) and the intra prediction mode of upper right side contiguous block are used as candidate.SPIPM_BL can have
At least one of intra prediction mode in left side and lower left side contiguous block for the position (0, H-1) of current block is as time
Choosing.SPIPM_BR can indicate the intra prediction mode of the contiguous block of current block.Or SPIPM_BR can be used for indicating current block
Intra prediction mode.
In the example being shown in FIG. 6, SPIPM_TL can have in the intra prediction mode of contiguous block d, b and j at least
One.In addition, SPIPM_TR can have at least one of the intra prediction mode of contiguous block g and h.In addition, SPIPM_BL can
At least one of intra prediction mode with contiguous block i and m.In addition, SPIPM_BR can have the intra prediction of current block
At least one of mode.
In addition, can be according to predetermined order nodes for research block or seed point.For example, can be by according to left side, upside, lower-left
The sequential search seed block or seed point of side, upper right side and upside carry out the intra prediction mode by corresponding seed block or seed point
Constitute SPIPM list.
It, can be for each in SPIPM_TL, SPIPM_TR, SPIPM_BL and SPIPM_BR in order to construct SPIPM list
At least one of a candidate, which executes, to be excluded from other modes based on the similitude between intra prediction mode with different
The processing of the intra prediction mode in direction.Here, can intra prediction mode is poor (IPMD) be used as mark for measuring similitude
It is quasi-.Non-directional mode (for example, DC_MODE and PLANAR_MODE) can be excluded when constructing SPIPM list.
For example, if in each of three candidate pattern SPIPM_TL_mode of SPIPM_TL and SPIPM_
In comparison between the candidate pattern of neighbor (neighbor=TR or BL or BR), IPMD=abs (SPIPM_TL_mode-
SPIPM_neighbor) > Th1 (Th1 is positive integer), then can exclude corresponding mode from the candidate collection of SPIPM_TL.
For example, if in each of two candidate pattern SPIPM_TR_mode of SPIPM_TR and SPIPM_
In comparison between the candidate pattern of neighbor (neighbor=TL or BL or BR), IPMD=abs (SPIPM_TR_mode-
SPIPM_neighbor) > Th2 (Th2 is positive integer), then can exclude corresponding mode from the candidate collection of SPIPM_TR.
For example, if in each of two candidate pattern SPIPM_BL_mode of SPIPM_BL and SPIPM_
In comparison between the candidate pattern of neighbor (neighbor=TL or TR or BR), IPMD=abs (SPIPM_BL_mode-
SPIPM_neighbor) > Th3 (Th3 is positive integer), then can exclude corresponding mode from the candidate collection of SPIPM_BL.
For example, if in each of candidate pattern SPIPM_BR_mode of SPIPM_BR and SPIPM_neighbor
In comparison between the candidate pattern of (neighbor=TL or TR or BL), IPMD=abs (SPIPM_BR_mode-SPIPM_
Neighbor) > Th4 (Th4 is positive integer), then can exclude corresponding mode from the candidate collection of SPIPM_BR.
For example, if in the candidate of each of SPIPM_TL, SPIPM_TR, SPIPM_BL and SPIPM_BR at least
One is non-directional intra prediction mode, such as DC mode or plane mode, then can exclude to wait accordingly from candidate collection
Choosing.
It, can be according to using after the candidate with small similitude in the candidate for constructing SPIPM list is excluded
Specific 2D transformation model come determine IPDF generate needed for SPIPM quantity.For example, 2D transformation model may include that rigid body becomes
It changes, similarity transformation, affine transformation and homography conversion.In addition, can be determined as the quantity of SPIPM according to 2D transformation model can
1,2,3,4 or N of variate (N is positive integer).
For example, at least two SPIPM can be needed if being rigid body translation for the IPDF transformation model generated.
Rigid body translation can have 3DOF (3-DoF), as described in [equation 1].Here, (x, y) can be seed point
Coordinate before transformation, (x ', y ') can be the transformed coordinate of seed point.Θ, tx and ty be by determined model parameter,
They can be rotation angle, x-axis displacement and y-axis displacement respectively.
[equation 1]
It is right to obtain (x, y)-(x ', y ') that the Θ determined from a SPIPM can be used, and can by by (x, y)-(x ',
Y ') two equatioies relevant to Θ, tx and ty are determined to substitution [equation 1].In addition, can and Θ, tx determining from two SPIPM
Four equatioies relevant with ty, and three equatioies in four equatioies can be used to determine rigid body translation model.
It can be determined by least two in selection SPIPM_TL, SPIPM_TR, SPIPM_BL and SPIPM_BR described
Two SPIPM.The SPIPM of selection can be added in SPIPM list.
Fig. 7 is the diagram for showing the embodiment of SPIPM list of the construction including two SPIPM.
As shown in fig. 7, SPIPM list can be filled according to the ascending order of the IPMD sum of two SPIPM candidate patterns.
For example, one in one and SPIPM_TR in the candidate pattern of SPIPM_TL candidate pattern can be used as two
A SPIPM.For example, one in one and SPIPM_BL in the candidate pattern of SPIPM_TL candidate pattern can be used as two
A SPIPM.For example, one in one and SPIPM_BR in the candidate pattern of SPIPM_TL candidate pattern can be used as two
A SPIPM.For example, one in one and SPIPM_BL in the candidate pattern of SPIPM_TR candidate pattern can be used as two
A SPIPM.For example, one in one and SPIPM_BR in the candidate pattern of SPIPM_TR candidate pattern can be used as two
A SPIPM.For example, one in one and SPIPM_BR in the candidate pattern of SPIPM_BL candidate pattern can be used as two
A SPIPM.
If being not filled by two SPIPM, may be used can fill SPIPM list with SPIPM.For example, SPIPM can be used
± delta fills SPIPM list.Here, delta can be any positive integer, for example, 1,2,3 ....
Once two SPIPM (SPIPM1, SPIPM2) are determined, can be generated by [equation 1] relevant to Θ, tx and ty
Four equatioies.The parameter that three in four equatioies can be used to determine rigid body translation model.Determining model can be used for
IPDF is generated.
For example, can be used by SPIPM1 two equatioies calculated and by least one of SPIPM2 two equatioies calculated
To determine rigid body translation.For example, can be used in two equatioies by SPIPM1 two equatioies calculated and by SPIPM2 calculating
At least one determines rigid body translation.
For example, at least two can be needed if similarity transformation is used as the transformation model generated for IPDF
SPIPM。
Similarity transformation can have 4-DoF, as described in [equation 2].Here, before (x, y) can be the transformation of seed point
Coordinate, (x ', y ') can be the transformed coordinate of seed point.A, b, c and d can be determined model parameter.
[equation 2]
It is right to obtain (x, y)-(x ', y ') that the Θ determined from a SPIPM can be used, and can by by (x, y)-(x ',
Y ') two equatioies relevant to a, b, c and d are determined to substitution [equation 2].In addition, can and a, b, c determining from two SPIPM
Four equatioies relevant with d, and four equatioies can be used to obtain similarity transformation's model.
Two can be determined by least two in selection SPIPM_TL, SPIPM_TR, SPIPM_BL and SPIPM_BR
SPIPM.The SPIPM of selection can be added in SPIPM list.It here, as shown in Figure 22, can be according to two SPIPM candidates
The ascending order of the sum of the IPMD value of mode fills SPIPM list.
For example, one in one and SPIPM_TR in the candidate pattern of SPIPM_TL candidate pattern can be used as two
A SPIPM.For example, one in one and SPIPM_BL in the candidate pattern of SPIPM_TL candidate pattern can be used as two
A SPIPM.For example, one in one and SPIPM_BR in the candidate pattern of SPIPM_TL candidate pattern can be used as two
A SPIPM.For example, one in one and SPIPM_BL in the candidate pattern of SPIPM_TR candidate pattern can be used as two
A SPIPM.For example, one in one and SPIPM_BR in the candidate pattern of SPIPM_TR candidate pattern can be used as two
A SPIPM.For example, one in one and SPIPM_BR in the candidate pattern of SPIPM_BL candidate pattern can be used as two
A SPIPM.
If being not filled by two SPIPM, may be used can fill SPIPM list with SPIPM.For example, SPIPM can be used
± delta fills SPIPM list.Here, delta can be any positive integer, for example, 1,2,3 ....
Once two SPIPM (SPIPM1, SPIPM2) are determined, can be generated by [equation 2] relevant to a, b, c and d
Four equatioies determine the parameter of similarity transformation's model.Determining model can be used for IPDF generation.
For example, at least three SPIPM can be needed if affine transformation is used as the transformation model generated for IPDF.
Affine transformation can have 6-DoF, as described in [equation 3].Here, before (x, y) can be the transformation of seed point
Coordinate, (x ', y ') can be the transformed coordinate of seed point.A, b, c, d, e and f can be determined model parameter.
[equation 3]
It is right to obtain (x, y)-(x ', y ') that the Θ determined from a SPIPM can be used, and can by by (x, y)-(x ',
Y ') two equatioies relevant to a, b, c, d, e and f are determined to substitution [equation 3].In addition, can from three SPIPM it is determining with a,
B, relevant six equatioies of c, d, e and f, and six equatioies can be used to obtain affine Transform Model.
Three can be determined by least three in selection SPIPM_TL, SPIPM_TR, SPIPM_BL and SPIPM_BR
SPIPM.The SPIPM of selection can be added in SPIPM list.
Fig. 8 is the exemplary diagram for showing the embodiment of SPIPM list of the construction including three SPIPM.
As shown in figure 8, can be filled according to the ascending order of the sum of the IPMD value of three SPIPM candidate patterns using SPIPM
SPIPM list.
For example, can by one in one in the candidate pattern of SPIPM_TL, the candidate pattern of SPIPM_TR and
One in the candidate pattern of SPIPM_BL is used as three SPIPM.For example, can by one in the candidate pattern of SPIPM_TL,
One in one and SPIPM_BR candidate pattern in the candidate pattern of SPIPM_TR is used as three SPIPM.For example, can incite somebody to action
In one in the candidate pattern of SPIPM_TL, one in the candidate pattern of SPIPM_BL and the candidate pattern of SPIPM_BR
One is used as three SPIPM.For example, can will be in one in the candidate pattern of SPIPM_TR, the candidate pattern of SPIPM_BL
One in one and SPIPM_BR candidate pattern is used as three SPIPM.
If being not filled by three SPIPM, may be used can fill SPIPM list with SPIPM.For example, SPIPM can be used
± delta fills SPIPM list.Here, delta can be any positive integer, for example, 1,2,3 ....
Once three SPIPM (SPIPM1, SPIPM2, SPIPM3) are determined, can by [equation 3] generate with a, b, c, d,
Relevant six equatioies of e and f determine the parameter of affine Transform Model.Determining model can be used for IPDF generation.
For example, can be needed if homography conversion (or perspective transform) is used as the transformation model generated for IPDF
At least four SPIPM.
Affine transformation can have 8-DoF, as described in [equation 4].Here, before (x, y) can be the transformation of seed point
Coordinate, (x ', y ') can be the transformed coordinate of seed point.H1, h2, h3, h4, h5, h6, h7 and h8, which can be, to be determined
Model parameter.
[equation 4]
It is right to obtain (x, y)-(x ', y ') that the Θ determined from a SPIPM can be used, and can by by (x, y)-(x ',
Y ') two equatioies relevant to h1, h2, h3, h4, h5, h6, h7 and h8 are determined to substitution [equation 4].In addition, can be from four
SPIPM determines eight equatioies relevant to h1, h2, h3, h4, h5, h6, h7 and h8, and eight equatioies can be used to obtain
Obtain homography conversion model.
Four can be determined by least four in selection SPIPM_TL, SPIPM_TR, SPIPM_BL and SPIPM_BR
SPIPM.The SPIPM of selection can be added in SPIPM list.
Fig. 9 is the exemplary diagram for showing the embodiment of SPIPM list of the construction including four SPIPM.
As shown in figure 9, can according to the ascending order of the sum of the IPMD value of four SPIPM candidate patterns come using SPIPM sequentially
Fill SPIPM list.
For example, two in two and SPIPM_TR in the candidate pattern of SPIPM_TL candidate patterns can be used as four
A SPIPM.For example, two in two and SPIPM_BL in the candidate pattern of SPIPM_TL candidate patterns can be used as four
A SPIPM.For example, two in two and SPIPM_BR in the candidate pattern of SPIPM_TL candidate patterns can be used as four
A SPIPM.For example, two in two and SPIPM_TR in the candidate pattern of SPIPM_BL candidate patterns can be used as four
A SPIPM.For example, two in two and SPIPM_BR in the candidate pattern of SPIPM_BL candidate patterns can be used as four
A SPIPM.For example, can by one in two in the candidate pattern of SPIPM_TL, the candidate pattern of SPIPM_TR and
One in the candidate pattern of SPIPM_BL is used as four SPIPM.For example, can by two in the candidate pattern of SPIPM_TL,
One in one and SPIPM_BR candidate pattern in the candidate pattern of SPIPM_TR is used as four SPIPM.For example, can incite somebody to action
In two in the candidate pattern of SPIPM_TL, one in the candidate pattern of SPIPM_BL and the candidate pattern of SPIPM_BR
One is used as four SPIPM.For example, can will be in two in the candidate pattern of SPIPM_TR, the candidate pattern of SPIPM_TL
One in one and SPIPM_BL candidate pattern is used as four SPIPM.For example, can will be in the candidate pattern of SPIPM_TR
Two, one in the candidate pattern of SPIPM_TL and one in the candidate pattern of SPIPM_BR are used as four SPIPM.Example
It such as, can be by one and SPIPM_BL candidate in two in the candidate pattern of SPIPM_TR, the candidate pattern of SPIPM_TL
One in mode is used as four SPIPM.For example, can be by two in the candidate pattern of SPIPM_BL, the candidate of SPIPM_TL
One in one and SPIPM_TR candidate pattern in mode is used as four SPIPM.For example, can be by the candidate of SPIPM_BL
Two in mode, one in the candidate pattern of SPIPM_TL and one in the candidate pattern of SPIPM_BR are used as four
SPIPM.For example, can be by one and SPIPM_ in two in the candidate pattern of SPIPM_BL, the candidate pattern of SPIPM_TR
One in the candidate pattern of BR is used as four SPIPM.For example, can be by two, SPIPM_ in the candidate pattern of SPIPM_BR
One in one and SPIPM_TR candidate pattern in the candidate pattern of TL is used as four SPIPM.For example, can be by SPIPM_
Two in the candidate pattern of BR, one in the candidate pattern of SPIPM_TL and a use in the candidate pattern of SPIPM_BL
Make four SPIPM.For example, can by one in two in the candidate pattern of SPIPM_BR, the candidate pattern of SPIPM_TR and
One in the candidate pattern of SPIPM_BL is used as four SPIPM.For example, can by one in the candidate pattern of SPIPM_TL,
In one in the candidate pattern of SPIPM_TR, one in the candidate pattern of SPIPM_BL and the candidate pattern of SPIPM_BR
One is used as four SPIPM.
If being not filled by four SPIPM, may be used can fill SPIPM list with SPIPM.For example, SPIPM can be used
± delta fills SPIPM list.Here, delta can be any positive integer, for example, 1,2,3 ....
Once four SPIPM (SPIPM1, SPIPM2, SPIPM3, SPIPM4) are determined, can by [equation 4] generate with
Relevant eight equatioies of h1, h2, h3, h4, h5, h6, h7 and h8 determine the parameter of homography conversion model.Determining model can
It is generated for IPDF.
After generating IPDF using predetermined map model, the IPDF generated can be used that intra prediction mode is distributed to W
K × L sub-block in × H current block.Here, (K is equal to size K × L of each sub-block or the positive integer less than M, L are equal to
Or the positive integer less than H) it can be the fixed dimension of size equal to or less than current block.Or the size of usable current block
And/or IPMD adaptively determines sub-block size.Or sub-block can be equal to the size of current block.
Figure 10 be show current block size be the sub-block size in the case where 16 × 16 exemplary diagram.
As shown in (a) of Figure 10, the size of sub-block can be fixed as 8 × 8.Alternatively, as shown in (b) of Figure 10, the ruler of sub-block
It is very little to be fixed as 4 × 4.Alternatively, the size of sub-block can be fixed as 2 × 2 as shown in (c) of Figure 10.Alternatively, such as (d) institute of Figure 10
Show, the size of sub-block can be fixed as 1 × 1.Fixed dimension 1 × 1 can be the size of sampling point unit.
For example, the size of sub-block can be determined based on the size of current block.For example, can SPIPM_TL based on current block,
At least one of IPMD of SPIPM_TR, SPIPM_BL and SPIPM_BR determines the size of sub-block.For example, can be based on current
The size of at least one of IPMD of SPIPM_TL, SPIPM_TR, SPIPM_BL and SPIPM_BR of block and current block is come
Determine the size of sub-block.
The information to the size (granularity) about sub-block it can carry out entropy coding/entropy decoding in the bitstream.It here, can be
The information is carried out at least one of VPS, SPS, PPS, APS, slice header, parallel build, CTU, CU, PU, TU, block and sub-block
Entropy coding/entropy decoding.
Can adaptively be derived according to the size and/or IPMD of current block should without sending about the information of sub-block size
Information.
In addition, can at least one of the coding parameter of contiguous block of coding parameter and current block based on current block come really
Stator block size.
Determining IPDF can be used to distribute the intra prediction mode of sub-block.It can be true by substituting into the coordinate of specific position
The intra prediction mode in specific position in each sub-block is embodied as vector by fixed IPDF model.It can be true by specific position
It is set to the position or the position adjacent with the boundary of sub-block of the pixel in sub-block.For example, can by the upper left side of sub-block, upper right side,
At least one of lower left side, lower right side and medium position are determined as specific position.If the coordinate of the specific position in sub-block
It is (x, y) and is (x ', y ') by the transformation coefficient of the position calculated IPDF, then can passes through θSB=atan [(y '-y)/(x '-
X)] the direction θ of vector is determinedSB。
Figure 11 is the diagram for showing the embodiment using determining IPDF distribution intra prediction mode.
It as shown in figure 11, can be by θSBThe intra prediction mould oriented according to most like direction being mapped in directional mode
Formula.Look-up table (LUT) can be used to execute θSBIt is mapped to intra prediction mode.
In addition, IPDF can be distributed based on nearest method when using the intra prediction mode of IPDF distribution sub-block
For the intra prediction mode of sub-block.It, can be by by IPDF amount in addition, when intra prediction mode is distributed to sub-block using IPDF
It turns to integer and intra prediction mode is distributed into sub-block.In addition, when intra prediction mode is distributed to sub-block using IPDF,
Intra prediction mode can be distributed into sub-block for immediate integer by being rounded IPDF.
It, will be in the bitstream by other entropy coding/entropy decoding for the intra prediction by sub-block based on transformation model
Information may include it is following at least one.
Indicate whether that being directed to current block performs the information of the intra prediction by sub-block based on transformation model: TBIP_
flag
TBIP_flag can be indicate whether using in the reconstructed block neighbouring with current block by using intra prediction
Be encoded/intra prediction mode of at least one of decoded piece of intra prediction mode and current block derives each sub-block
Intra prediction mode information.
Indicate the index of the SPIPM used set: SPIPM_idx
Now, another embodiment that the intra prediction mode based on sub-block is derived using transformation model will be provided.For example,
Exist in neighbouring reconstructed block by the intra prediction by sub-block based on transformation model it is encoded/decoded piece in the case where,
It the IPDF model of contiguous block can be used to derive intra prediction mode for each sub-block, rather than directly generate current block
IPDF。
Pass through the frame by sub-block based on transformation model to determine to whether there is in the neighbouring reconstructed block of current block
Interior prediction is encoded/any piece decoded, and predefined scanning sequency can be used.Scanning sequency can be in following sequence at least
One.
Figure 12 is the exemplary diagram for showing the reconstructed block neighbouring with current block.
For example, in Figure 12 scanning can be executed according to A → B → C → D → E sequence.Alternatively, can be according to A → B → D → C
The sequence of → E executes scanning.Alternatively, scanning can be executed according to B → A → D → C → E sequence.Alternatively, can according to E → A → B →
The sequence of C → D executes scanning.Alternatively, scanning can be executed according to any other sequence.
Alternatively, a part of block A, B, C, D and C can be excluded in a scan.Alternatively, can scan in addition to block A, B, C, D and C it
Outer block.It can be based on size as described herein, shape and the coding parameter of at least one of neighbouring reconstructed block and current block
At least one of determine scanned neighbouring reconstructed block.
Figure 13 is the diagram for showing the embodiment that intra prediction mode is derived using neighbouring reconstructed block.
In the example depicted in fig. 13, by using transformation model by the intra prediction that sub-block is unit to as working as
In the case that the block A of preceding piece of contiguous block is encoded/decoded, SPIPM_A_TL, SPIPM_A_TR of usable block A,
At least one of SPIPM_A_BL and SPIPM_A_BR generate the IPDF of block A.
The IPDF of block A can be used derive SPIPM_Cur_TL, SPIPM_Cur_TR, SPIPM_Cur_BL of current block and
At least one of SPIPM_Cur_BR, and SPIPM_Cur_TL, SPIPM_Cur_TR, the SPIPM_Cur_ derived can be used
At least one described IPDF to generate current block in BL and SPIPM_Cur_BR, thereby executing the intra prediction for pressing sub-block.
If at least one of neighbouring reconstructed block of current block is to be encoded/decoded piece using IPDF, may be used
The IPDF of current block is accordingly derived adjacent to the IPDF of reconstructed block.In addition, entropy coding/entropy can be carried out to the information of TBIP_flag
Decoding.
The spatial models such as use to derive another embodiment of the intra prediction mode based on sub-block description.
Figure 14 is the diagram for showing the embodiment for deriving the intra prediction mode based on sub-block.
In the case where equal spatial models are by use, it may be desired at least two SPIPM.For example, as shown in (a) of Figure 14,
Four candidate patterns can be selected in total, that is, one in the candidate pattern of SPIPM_TL, one in the candidate pattern of SPIPM_TR
One in a, SPIPM_BL candidate pattern and one in the candidate pattern of SPIPM_BR.As shown in figure 9, can be according to
Four SPIPM candidate patterns of selection are filled into SPIPM list by the ascending order of the sum of IPMD value.
SPIPM_TL, SPIPM_TR, SPIPM_BL and/or SPIPM_BR can be used to determine outermost of current block first
The intra prediction mode of block.Determine that intra prediction mode can be indicated using at least two intra prediction modes at equal intervals Deng spatially
Ground divide to the value of intra prediction mode and the intra prediction mode value after division is distributed to sub-block.
For example, if it is 21 that SPIPM_TL, which is 24 and SPIPM_TR, can make in the example as shown in (a) of Figure 14
Value with SPIPM_TL and SPIPM_TR etc. spatially determines the intra prediction mode of sub-block A, B, C and D.For example, such as Figure 14
(b) shown in, it may be determined that A=24, B=23, C=22 and D=21.For example, in the example as shown in (a) of Figure 14, if
SPIPM_TL is that 25 and SPIPM_BL is 38, may be used value of SPIPM_TL and SPIPM_BL etc. spatially determine sub-block A,
E, the intra prediction mode of I and M.For example, as shown in (b) of Figure 14, it may be determined that A=24, E=29, I=34 and M=38.Example
Such as, in the example as shown in (a) of Figure 14, if it is 35 that SPIPM_BL, which is 38 and SPIPM_BR, SPIPM_BL may be used
The intra prediction mode of sub-block M, N, O and P are spatially determined with the value of SPIPM_BR etc..For example, as shown in (b) of Figure 14, it can
Determine M=38, N=37, O=36 and P=35.For example, in the example as shown in (a) of Figure 14, if SPIPM_TR is 21
And SPIPM_BR is 35, and value of SPIPM_TR and SPIPM_BR etc. may be used and spatially determine in the frame of sub-block D, H, I and P
Prediction mode.For example, as shown in (b) of Figure 14, it may be determined that D=21, H=26, I=31 and P=35.
After all intra prediction modes of the outermost sub-block of current block are determined, it may be determined that the frame of secondary outside sub-block
Inner estimation mode.In the example shown in Figure 14, secondary outside sub-block can be sub-block F, G, J and K.It here, can be by SPIPM_TL
Be reset to time the upper left side position of the upper left side sub-block (the sub-block F in (a) of Figure 14) in the sub-block of outside mode (Figure 14's
(a) mode of the sub-block A in) value.In addition, SPIPM_TR can be reset to upper right side sub-block (Figure 14 in time outside sub-block
(a) in sub-block G) upper right side position mode (mode of the sub-block D in (a) of Figure 14) value.In addition, can incite somebody to action
SPIPM_BL is reset to the mode of the lower-left side position of the lower left side sub-block (the sub-block J in (a) of Figure 14) in time outside sub-block
The value of (mode of the sub-block M in (a) of Figure 14).In addition, SPIPM_BR can be reset to lower right side in time outside sub-block
The value of the mode (mode of the sub-block P in (a) of Figure 14) of the bottom right side position of block (the sub-block K in (a) of Figure 14).It can recurrence
Ground repeats the operation, until the mode of all sub-blocks of current block is determined.
For example, if it is 21 that SPIPM_TL, which is 24 and SPIPM_TR, can make in the example shown in (b) of Figure 14
Value with SPIPM_TL and SPIPM_TR etc. spatially determines the intra prediction mode of sub-block F and G.For example, such as (c) institute of Figure 14
Show, it may be determined that F=24 and G=21.For example, in the example shown in (b) of Figure 14, if SPIPM_BL be 38 and
SPIPM_BR is 35, and the intra prediction mould that value of SPIPM_BL and SPIPM_BR etc. spatially determines sub-block J and K may be used
Formula.For example, as shown in (c) of Figure 14, it may be determined that J=38 and K=35.
It will can be with by the information of other entropy coding/entropy decoding for the intra prediction by sub-block based on equal spatial models
It is at least one of the following.
Indicate whether that being directed to current block performs the information of the intra prediction by sub-block based on equal spatial models: ES_
flag
Indicate the index of the SPIPM used set: SPIPM_idx
Now, another embodiment using intra prediction mode of the bi-linear filter model inference based on sub-block will be provided
Description.
Figure 15 is the diagram for showing another embodiment for deriving the intra prediction mode based on sub-block.
The intra prediction mode based on sub-block is determined in order to use bi-linear filter model, it may be desired at least two
SPIPM.It, can one, the time of SPIPM_TR in the candidate pattern by selecting SPIPM_TL for example, as shown in (a) of Figure 15
One in lectotype, one in the candidate pattern of SPIPM_BL and one in the candidate pattern of SPIPM_BR it is total to select
Totally four candidate patterns.As shown in figure 9, can be according to the ascending order of the sum of IPMD value by four SPIPM candidate patterns sequences of selection
Ground is filled into SPIPM list.
The mode of upper left side sub-block (the sub-block A in (a) of Figure 15) in current block can be determined as SPIPM_TL.This
Outside, the mode of the upper right side sub-block (the sub-block D in (a) of Figure 15) in current block can be determined as SPIPM_TR.In addition, can incite somebody to action
The mode of lower left side sub-block (the sub-block M in (a) of Figure 15) in current block is determined as SPIPM_BL.In addition, can be by current block
In the mode of lower right side sub-block (the sub-block P in (a) of Figure 15) be determined as SPIPM_BR.As shown in (b) of Figure 15, it can will work as
The intra prediction mode of upper left side, upper right side, lower left side and lower right side sub-block in preceding piece be identified as SPIPM_TL,
SPIPM_TR, SPIPM_BL and SPIPM_BR.However, upper left side, upper right side, lower left side and lower right side sub-block in current block
Intra prediction mode is not limited to SPIPM_TL, SPIPM_TR, SPIPM_BL and SPIPM_BR, and can be by the upper left in current block
At least one of side, upper right side, lower left side and intra prediction mode of lower right side sub-block are determined as SPIPM_TL, SPIPM_
At least one of TR, SPIPM_BL and SPIPM_BR.
Bi-linear filter scheme can be used to determine the intra prediction mode of other sub-blocks.For example, following [etc. can be used
Formula 5].In [equation 5], function () can be floor () or at least one of ceil () or round ().Scheming
In example shown in 15, function () can be round ().In addition, #of SubBlk in wdt can in [equation 5]
Indicate the quantity of the horizontal sub-block in current block.Similarly, #ofSubBlkin hgt can indicate the vertical sub-block in current block
Quantity.
[equation 5]
For example, [equation 5] can be used to determine the intra prediction mode of remaining sub-block as shown in (c) of Figure 15.
It will be for the intra prediction by sub-block based on bi-linear filter model and by the letter of other entropy coding/entropy decoding
Breath can be at least one of the following.
Indicate whether that being directed to current block performs the letter of the intra prediction by sub-block based on bi-linear filter model
Breath: BF_flag
Indicate the index of the SPIPM used set: SPIPM_idx
Can be used in the neighbouring reconstructed block of current block pass through intra prediction it is encoded/decoded piece of intra prediction
The intra prediction mode of at least one of mode and current block derives intra prediction mode to be based on sub-block, and can be used
The intra prediction mode derived executes intra prediction to be based on sub-block.Here, can be included within previously based on sub-block be encoded/
Sampling point in decoded sub-block is used as the reference sampling point of the subsequent intra prediction by sub-block.
Encoder can be by executing transformation, secondary change for the first time for the residual block generated after the intra prediction by sub-block
It at least one of changes and quantifies to generate transformation coefficient.Entropy coding can be carried out to the transformation coefficient of generation.Current block can be directed to
Or transformation, quadratic transformation and quantization for the first time are executed based on sub-block.For example, transformation, two for the first time can be executed for entire current block
At least one of secondary transform and quantization, or can be executed for each sub-block in transformation, quadratic transformation and quantization for the first time extremely
It is one few.Here, transformation, quadratic transformation and quantization for the first time can not be executed for current block or sub-block.
Entropy decoding can be carried out to transformation coefficient in a decoder.It can be by executing inverse for the transformation coefficient after entropy decoding
Change, inverse transformation for the first time and secondary inverting at least one of change to generate reconstructive residual error block.For current block or sub-block can be based on
To execute transformation, quadratic transformation and quantization for the first time.For example, transformation, quadratic transformation and amount for the first time can be executed for entire current block
At least one of change, and at least one of transformation, quadratic transformation and quantization for the first time can be executed for each sub-block.This
In, transformation, quadratic transformation and quantization for the first time can not be executed for current block or sub-block.
Entropy coding/entropy decoding can be carried out to intraframe prediction information from bit stream.Figure 31 is shown including intra prediction mould
The exemplary diagram of the syntactic structure of formula information.As shown in figure 31, intraframe prediction information may include in following information at least
One.Here, it can be sent at least one of VPS, SPS, PPS, APS, slice header and parallel build with signal pre- in frame
Measurement information.
Indicate the whether matched mark of MPM: for example, prev_intra_luma_pred_flag
Indicate the index of the position in MPM list: for example, mpm_idx
Luma prediction modes information in frame: for example, rem_intra_luma_pred_mode
Prediction mode for chroma information in frame: for example, intra_chroma_pred_mode
Indicate the mark that the intra prediction mode of current block and sub-block is derived using the intra prediction mode of contiguous block: example
Such as, NDIP_flag
It is carried out when the intra prediction mode for deriving current block using N number of MPM list or to the intra prediction mode of current block
When entropy coding/entropy decoding, in each of N number of MPM list instruction frame identical with the intra prediction mode of current block
Whether prediction mode includes the indicator (MPM mark) in the intra prediction mode of MPM list: for example, MPM_FLAG_1,
MPM_FLAG_2、…、MPM_FLAG_N
As specific one that intra prediction mode identical with the intra prediction mode of current block includes in N number of MPM list
When in the intra prediction mode of a MPM list, the index of position or sequence of the intra prediction mode in the MPM list is indicated
Information: for example, MPM_IDX_1, MPM_IDX_2 ..., MPM_IDX_N
Indicate whether that being directed to current block performs the information of the intra prediction by sub-block based on transformation model and refer to
Show the index of the SPIPM used set: for example, TBIP_flag and SPIPM_idx
Indicate whether to be directed to current block use etc. spatial models based on sub-block derived the information of intra prediction mode with
And indicate the index of the SPIPM used set: ES_flag and SPIPM_idx
Indicate whether that being directed to current block has derived intra prediction mode based on sub-block using bi-linear filter model
The index for the SPIPM set that information and instruction use: BF_flag and SPIPM_idx
It, can be from including being encoded/solution by using MPM index mpm_idx when MPM (most probable mode) mark is 1
The candidate pattern of the frame mode of the adjacent cells of code derives the intra prediction mode of luminance component.
It, can be by using the intraprediction mode information about luminance component when MPM (most probable mode) mark is 0
Rem_intra_luma_pred_mode encodes/decodes the intra prediction mode of luminance component.
It can be by using the intraprediction mode information intra_chroma_pred_mode and/or color about chromatic component
The corresponding intra prediction mode of degree component blocks encodes/decodes the intra prediction mode of chromatic component.
Entropy coding/entropy decoding can be carried out to intraframe prediction information from bit stream based at least one of coding parameter.
For example, can be encoded/decoded based on block division information to NDIP_flag.
For example, if at least one of split_flag, quadtree_flag and binarytree_flag are " 0 ",
And therefore block is no longer divided, then can be encoded/decoded to NDIP_flag.For example, if binarytree_flag is
1, then NDIP_flag can not be encoded/decoded.
At least one of size and shape of block can be not based on to be sent in above-mentioned a plurality of intraframe prediction information with signal
At least one.
For example, intra prediction of the signal transmission about current block can not had to if the size of current block is predetermined size
At least one information in information, and can be used corresponding with previous coding/size of decoded upper layer block about pre- in frame
At least one information in the information of survey.For example, can not have to signal if the shape of current block is rectangle and send about current
At least one information in the intraframe prediction information of block, and can be used corresponding to previous coding/size of decoded upper layer block
The information about intra prediction at least one information.
When carrying out entropy coding/entropy decoding at least one information in intraframe prediction information, following binaryzation can be used
At least one of method method.
This binarization method of Lay is truncated
- K rank Exp-Golomb binarization method
Limited K rank Exp-Golomb binarization method
Regular length binarization method
Unitary binarization method
Unitary binarization method is truncated
Now, the detailed description with reference to sampling point construction step S520 will be provided.
In the son based on the intra prediction mode derived to current block or than current block with smaller szie and/or shape
Block carries out that the reference sampling point for prediction can be constructed in the step of intra prediction.Following retouch is provided according to the context of current block
It states, and current block can mean sub-block.It one or more reconstruction sampling points or sampling point neighbouring with current block can be used to combine to come
Building refers to sampling point.In addition, can be in building be with reference to the step of sampling point using filtering.Here, it can be used as former state according to its multiple heavy
Each reconstruction sampling point for building on sampling point line is constructed with reference to sampling point.Alternatively, can be between the sampling point on identical reconstruction sampling point line
Building is with reference to sampling point after being filtered.Alternatively, can be to structure after being filtered between the sampling point on different reconstruction sampling point lines
It builds with reference to sampling point.The reference sampling point of building can indicate by ref [m, n], rebuild neighbouring sampling point or by rebuild neighbouring sampling point into
The sampling point that row filtering obtains can be indicated by rec [m, n].Here, m or n can be predetermined integers value.It is W in the size of current block
It, then can will be with the sampling point position if the top side sampling point position of current block is (0,0) in the case where (level) × H (vertical)
Immediate most upper left side is set as (- 1, -1) with reference to the relative position of sampling point.
Figure 16 is the exemplary diagram for showing the neighbouring reconstruction sampling point line for the intra prediction that can be used for current block.
As shown in figure 16, one or more reconstruction sampling point lines adjacent with current block can be used to construct with reference to sampling point.
For example, multiple one rebuild in sampling point line shown in Figure 16 may be selected, and the reconstruction sampling point of selection can be used
Line building refers to sampling point.It can be by the scheduled one reconstruction sampling point line being fixedly selected as selection in multiple reconstruction sampling point lines.
Alternatively, the reconstruction sampling point line for selection can be adaptive selected specific one in multiple reconstruction sampling point lines.In this feelings
Under condition, available signal sends the indicator of the reconstruction sampling point line for selection.
For example, can in combination using shown in Figure 16 it is multiple rebuild in sampling point line one or more construct reference
Sampling point.For example, reference sampling point can be configured to one or more weighted sums (or weighted average) for rebuilding sampling point.Can based on away from
The distance of current block distributes the weight for weighted sum.Here, biggish weight can be distributed to away from the shorter distance of current block.
For example, following [equation 6] can be used.
[equation 6]
Ref [- 1, -1]=(rec [- 2, -1]+2*rec [- 1, -1]+rec [- 1, -2]+2) > > 2
Ref [x, -1]=(rec [x, -2]+3*rec [x, -1]+2) > > 2, (x=0~W+H-1)
Ref [- 1, y]=(rec [- 2, y]+3*rec [- 1, y]+2) > > 2, (y=0~W+H-1)
Alternatively, multiple reconstruction sampling points can be used based on distance or at least one of intra prediction mode away from current block
At least one of average value, maximum value, minimum value, intermediate value and most frequent value construct with reference to sampling point.
Alternatively, can be constructed based on the change (variation) of multiple continuous values for rebuilding sampling point with reference to sampling point.For example, can be based on
Whether the difference between two continuous values for rebuilding sampling point is equal to or more than threshold value, two continuous values for rebuilding sampling points be it is continuous or
It is discontinuous at least one of to change etc. to construct with reference to sampling point.For example, if between rec [- 1, -1] and rec [- 2, -1]
Difference is equal to or more than threshold value, then ref [- 1, -1] can be determined as to rec [- 1, -1] or by using distributing to rec [- 1, -1]
Predefined weight application weighting is average and the value that obtains.For example, if being somebody's turn to do as multiple continuous reconstruction sampling points are closer to current block
Multiple continuous values for rebuilding sampling point change n every time, then can will be determined as rec [- 1, -1]-n with reference to sampling point ref [- 1, -1].
Can according to the upside of current block or left border whether in picture, band, parallel block and coding tree block (CTB)
The boundary of at least one accordingly differently determines the quantity for rebuilding sampling point line and position and for constructing the structure for referring to sampling point
At least one of construction method.
For example, using rebuilding in the step of building of sampling point line 1 and 2 refers to sampling point, when the boundary and CTB of current block
When boundary is corresponding, rebuilding sampling point line 1 can be used for upside and rebuilds sampling point line 1 and 2 to can be used for left side.
For example, using rebuilding in the step of building of sampling point line 1 to 4 refers to sampling point, when the boundary and CTB of current block
When boundary is corresponding, rebuilding sampling point line 1 and 2 can be used for upside and rebuilds sampling point line 1 to 4 to can be used for left side.
For example, using rebuilding in the step of building of sampling point line 2 refers to sampling point, when boundary and the side CTB of current block
When boundary is corresponding, rebuilding sampling point line 1 can be used for upside and rebuilds sampling point line 2 to can be used for left side.
It can be one or more with reference to sampling point line by handling building above.
The reference sampling point construction method of the upside of current block can be different from the reference sampling point construction method in the left side of current block.
The information with reference to sampling point can be constructed using at least one method in above method to instruction encode/solve
Code.For example, can be encoded/decoded to the information for having used multiple reconstruction sampling point lines are indicated whether.
If current block is divided into multiple sub-blocks, and each sub-block has independent intra prediction mode, then can needle
Sampling point is referred to the building of each sub-block.
Figure 17 is to show for including the sub-block in current block to construct the diagram of the embodiment with reference to sampling point.
As shown in figure 17, if the size of current block is that 16 × 16 and 16 4 × 4 sub-blocks have independent intra prediction
Mode can be then directed to according to the sweeping scheme for being predicted sub-block using at least one of following methods to construct
The reference sampling point of each sub-block.
For example, the N number of reconstruction sampling point line adjacent with current block can be used, construct for each sub-block with reference to sampling point.?
In example shown in Figure 17, N is 1.
For example, the case where the raster scan order according to 1 → 2 → 3 →...→ 15 → 16 predicts multiple sub-blocks
Under, can be used be encoded/sampling point of at least one of decoded left side, upside, upper right side and lower left side sub-block constructs
For the reference sampling point of k-th sub block.
For example, the Z scanning sequency according to 1 → 2 → 5 → 6 → 3 → 4 → 7 →...→ 12 → 15 → 16 to multiple sub-blocks into
In the case where row prediction, it can be used and be encoded/at least one of decoded left side, upside, upper right side and lower left side sub-block
Sampling point construct the reference sampling point for k-th sub block.
For example, in the sawtooth scan sequence according to 1 → 2 → 5 → 9 → 6 → 3 → 4 →...→ 12 → 15 → 16 to multiple sons
In the case that block is predicted, can be used be encoded/decoded left side, upside, upper right side and lower left side sub-block at least
One sampling point constructs the reference sampling point for k-th sub block.
For example, according to 1 → 5 → 9 → 13 → 2 → 6 →...→ 8 → 12 → 16 vertical scanning sequence to multiple sub-blocks into
In the case where row prediction, it can be used and be encoded/at least one of decoded left side, upside, upper right side and lower left side sub-block
Sampling point construct the reference sampling point for k-th sub block.
In the case where predicting according to the scanning sequency other than the above scanning sequency multiple sub-blocks, can be used
Be encoded/sampling point of at least one of decoded left side, upside, upper right side and lower left side sub-block constructs for k-th sub
The reference sampling point of block.
In selection is with reference to the step of sampling point, executable includes the determination and/or filling of the availability of the block with reference to sampling point.
For example, if include with reference to sampling point block it is available, may be used with reference to sampling point.Meanwhile it can not with reference to the block of sampling point if including
With, then can by fill come using it is one or more it is available neighbouring replace with reference to sampling points it is unavailable with reference to sampling point.
If be present in picture boundaries, parallel block boundary, band boundaries, the boundary CTB and predetermined margin with reference to sampling point
Except at least one, then it can determine unavailable with reference to sampling point.
In the case where being encoded by CIP (constraint intra prediction) to current block, if according to inter-frame forecast mode
To including being encoded/decoded with reference to the block of sampling point, then can determine unavailable with reference to sampling point.
Figure 18 is the diagram shown using that can replace the unavailable method for rebuilding sampling point with reconstruction sampling point.
If it is determined that neighbouring sampling point of rebuilding is unavailable, neighbouring available sampling point of rebuilding may be used and replace unavailable sampling point.Example
Such as, as shown in figure 18, in the presence of sampling point and unavailable sampling point can be used, one or more available sampling points can be used to replace
Change unavailable sampling point.
The sample value that unavailable sampling point can be replaced with the sample value of sampling point can be used according to predetermined order.Can be used with can not
With sampling point it is adjacent unavailable sampling point can be replaced with sampling point.In the case where adjacent available sampling point is not present, can be used first
The available sampling point or immediate available sampling point occurred.The replacement sequence of unavailable sampling point can be from most lower left side to most upper right
The sequence of side.Or the replacement sequence of unavailable sampling point can be the sequence from most upper right side to most lower left side.Or it is unavailable
The replacement sequence of sampling point can be from most upper left side to most lower right side and/or the sequence of most lower left side.Or unavailable sampling point
Replacement sequence can be from most upper right side and/or most lower left side to the sequence of most upper left side.
It as shown in figure 18, can be according to unavailable to replace from most lower left side sampling point position 0 to the sequence of most upper right side sampling point
Sampling point.In this case, it can be used and occur first or immediate can replace four unavailable samples first with the value of sampling point a
The value of point.The value that following 13 unavailable sampling points can be finally replaced with the value of sampling point b can be used.
Alternatively, can be used can replace unavailable sampling point with the combination of sampling point.For example, two with unavailable sampling point can be used
Hold adjacent can replace unavailable sampling point with the intermediate value of sampling point.For example, can be used can be filled out with the value of sampling point a in Figure 18
Four unavailable sampling points first are filled, can be used can be with sampling point b and can filling following 13 unavailable samples with the intermediate value of sampling point c
Point.Alternatively, can be used can fill with sampling point b and with the arbitrary value between the value of sampling point c this 13 unavailable sampling points.At this
In the case of kind, different value can be used to replace unavailable sampling point.For example, can make as the closer available sampling point a of unavailable sampling point
With with value that unavailable sampling point can be replaced with the close value of the value of sampling point a.Similarly, when the closer available sample of unavailable sampling point
When point b, the value of unavailable sampling point is can be used and can replaced with the close value of the value of sampling point b.That is, can be based on from can not
With sampling point to the value that can determine unavailable sampling point with the distance of sampling point a and/or b.
In order to replace unavailable sampling point, optionally application includes one or more in multiple methods of above method
It is a.Can information signal in the bitstream sends method for replacing unavailable sampling point by including, or can be used by
The scheduled method of encoder and decoder.Or method for replacing unavailable sampling point can be derived by predetermined scheme.For example,
It can be based on can be selected with the quantity of the poor and/or unavailable sampling point between the value of sampling point a and b for replacing unavailable sampling point
Method.For example, can difference between the value based on two available sampling points compared between threshold value and/or the quantity of unavailable sampling point
The method for replacing unavailable sampling point is selected compared between threshold value.For example, if between the value of two available sampling points
Difference be greater than threshold value and/or if unavailable sampling point quantity be greater than threshold value, different value may be used to replace unavailable sampling point
Value.
One or more for building refer to sampling point, it may be determined whether according to the intra prediction mode of current block, ruler
At least one of very little and shape filters to apply.It, can intra prediction mode according to current block, size if application filtering
Come at least one of shape using different filter types.
For example, can differently determine whether with reference to each of sampling point line using filtering and/or filter for multiple
Type.For example, the first adjacent threads can be applied filtering in, and the second adjacent threads can not be applied filtering in.For example, can will filter
Both value and unfiltered value afterwards are for referring to sampling point.For example, in 3 tap filters, 5 tap filters and 7 tap filterings
In device, at least one filter can be selected and applied according at least one of the intra prediction mode of block, size and shape.
Hereinafter, will be described in the step of executing intra prediction (S530).
Intra prediction mode based on derivation and intra prediction can be executed to current block or sub-block with reference to sampling point.It is retouched following
In stating, current block can mean sub-block.
For example, executable non-directional intra prediction.Non-directional intra prediction mode can be DC mode peace face mould
At least one of formula.
One or more intermediate values in the reference sampling point of building can be used to execute the intra prediction of DC mode.It can incite somebody to action
Filtering application is in one or more prediction sampling points on the boundary in current block.Can according in the size and shape of current block extremely
Few one adaptively executes DC mode intra prediction.
Figure 19 is the exemplary diagram for showing the intra prediction of the shape according to current block.
For example, as Figure 19 (a) shown in, if the shape of current block is square, may be used current block upside and
The intermediate value of the reference sampling point in left side predicts current block.
For example, as Figure 19 (b) shown in, if the shape of current block be rectangle, may be used with current block width and
The neighbouring intermediate value with reference to sampling point of longer sides among length predicts current block.
For example, if the size of current block within a predetermined range, is selected from the upside of current block or left side reference sampling point
It selects predetermined sampling point, and the intermediate value of the sampling point of selection can be used to execute prediction.
It can be by consideration according to reference of the position away from one or more buildings of the target intra prediction sampling point of current block
The distance of sampling point calculates weighted sum to execute plane mode intra prediction.
For example, N number of weighted sum with reference to sampling point can be calculated as prediction block according to the position (x, y) of target prediction sampling point.N
It can be positive integer, for example, 4.
For example, executable directional intra prediction.Directional prediction mode can be horizontal pattern, vertical mode and have
At least one of mode of predetermined angular.
It can be used one or more with reference to sampling point on the horizontal/vertical line of the position in target intra prediction sampling point
To execute horizontal vertical pattern intra prediction.
The position relative to target intra prediction sampling point can be used that there are one or more ginsengs on the line of predetermined angular
Sampling point is examined to execute the intra prediction under the mode with the predetermined angular.Here, N number of sampling point can be used.N can be just whole
Number, such as, 2,3,4,5 or 6.In addition, for example, can be by the way that using N tap filter, (such as, 2 taps, 3 taps, 4 taps, 5 are taken out
Head or 6 tap filters) execute prediction.
For example, intra prediction can be executed based on location information.Location information can be encoded/decoded, and can will be
The reconstruction sampling point block of the position is derived as the intra-frame prediction block of current block.Or it can will be detected by decoder and current block class
As block be derived as the intra-frame prediction block of current block.
For example, color component prediction in executable frame.For example, can be used the reconstruction luminance component of current block for coloration point
Amount executes intra prediction.Alternatively, a reconstruction chromatic component Cb of current block can be used to execute frame for another chromatic component Cr
Interior prediction.
It can be by executing intra prediction using one or more in above-mentioned various intra-frame prediction methods in combination.Example
Such as, by using the block that predetermined non-directional intra prediction mode is predicted and predetermined party tropism intra prediction mode quilt can be used
The weighted sum of the block of prediction constructs intra-frame prediction block to be directed to current block.It here, can intra prediction mode, block according to current block
At least one of size, shape and/or sampling point position apply different weights.
Above embodiments can be executed by the same way in the encoder and the decoder.
The sequence for being applied to above embodiments can be different between encoder and decoder, or are applied to above embodiments
Sequence can be identical between encoder and decoder.
Above embodiments can be executed to each luminance signal and carrier chrominance signal, or can be to luminance signal and carrier chrominance signal etc.
Above embodiments are executed together.
The block form that above embodiments of the invention are applied to can have square form or non-square form.
Above embodiments of the invention can be according to encoding block, prediction block, transform block, block, current block, coding unit, prediction
The size of at least one of unit, converter unit, unit and active cell and applied.Here, the size can be defined
For minimum dimension or full-size perhaps both minimum dimension and full-size so that above embodiments are applied or can be determined
Justice is the fixed dimension that above embodiments are applied to.In addition, in the embodiment above, first embodiment can be applied to first
Size, second embodiment can be applied to the second size.In other words, above embodiments can be combined and answer according to the size
With.In addition, above embodiments can be applied when size is equal to or more than minimum dimension and is equal to or less than full-size.It changes
Sentence is talked about, and when block size includes within a predetermined range, above embodiments can be applied.
For example, above embodiments can be applied when the size of current block is 8 × 8 or bigger.For example, when current block
When having a size of 4 × 4 or bigger, above embodiments can be applied.For example, when the size of current block is 16 × 16 or bigger, with
Upper embodiment can be applied.For example, when the size of current block is equal to or more than 16 × 16 and is equal to or less than 64 × 64, it is above
Embodiment can be applied.
Above embodiments of the invention can be applied according to time horizon.It can be applied to identify above embodiments
Time horizon, available signal send corresponding identifier, and above embodiments can be applied to be indicated by corresponding identifier
Specific time layer.Here, the identifier can be defined as lowermost layer that above embodiments can be applied to or it is top or
Lowermost layer and top the two, or can be defined as indicating the certain layer that the embodiment is applied to.In addition, the implementation
The set time layer that example is applied to can be defined.
For example, above embodiments can be applied when the time horizon of present image is lowermost layer.For example, working as present image
Time layer identifier be 1 when, above embodiments can be applied.For example, when the time horizon of present image is top, it is above
Embodiment can be applied.
It can define the type of strip that above embodiments of the invention are applied to, and can be answered according to corresponding type of strip
Use above embodiments.
In the above-described embodiments, the method, but this hair are described based on the flow chart with a series of steps or units
The bright sequence for being not limited to the step, but, some steps can be performed simultaneously with other steps, or can be pressed with other steps
It is performed according to different order.It will be appreciated by one of ordinary skill in the art that the step in flow chart does not repel one another, and
And in the case where not influencing the scope of the present invention, other steps can be added in flow chart or some steps can be from stream
Journey figure is deleted.
Embodiment includes the example of various aspects.The all possible combination of various aspects, but this field can not be described
Technical staff will recognize that different combinations.Therefore, the present invention may include all replacements in the scope of the claims, repair
Change and changes.
The embodiment of the present invention can (program instruction can be executed by various computer modules, and be recorded according to program instruction
In computer readable recording medium) form be implemented.Computer readable recording medium may include individual program instruction, number
According to the combination of file, data structure etc. or program instruction, data file, data structure etc..It is recorded in computer-readable record
Program instruction in medium can be especially designed and be configured to the present invention or for the common of computer software technical field
It is well known for technical staff.The example of computer readable recording medium include: magnetic recording media (such as hard disk, floppy disk and
Tape)；Optical data carrier (such as CD-ROM or DVD-ROM)；Magnet-optical medium (such as floptical)；And by special structure
Make hardware device (such as read-only memory (ROM), random access memory (RAM), the sudden strain of a muscle for storing and implementation procedure instructs
It deposits).The example of program instruction not only includes the machine language code dissolved by compiler format, further includes that can be made by computer
The higher-level language code implemented with interpreter.Hardware device can be configured to be operated by one or more software modules to carry out
Processing according to the present invention, vice versa.
Although describing the present invention according to specific term (such as detailed elements) and limited embodiments and attached drawing, it
Be only provided to help more generically understand the present invention, present invention is not limited to the above embodiments.It is of the art
The skilled person will understand that various modifications and change can be made from the above description.
Therefore, spirit of the invention should not be so limited to above-described embodiment, whole models of the following claims and their equivalents
Enclosing will be considered within the scope and spirit of the invention.
Industrial applicability
The present invention can be used for encoding/decoding video.
Claims (19)
1. a kind of picture decoding method executed by video decoding apparatus, which comprises
It is one or more sub-blocks by current block subregion；
By using in the intra prediction mode of current block and the intra prediction mode of the contiguous block adjacent with current block at least
One derives the intra prediction mode of each of one or more sub-block sub-block；And
Each of one or more sub-block sub-block is executed in frame by using the intra prediction mode derived
Prediction.
2. the step of the method for claim 1, wherein deriving intra prediction mode includes:
It is used for by using at least one of the intra prediction mode of current block and intra prediction mode of contiguous block to generate
The intra prediction direction field IPDF of current block；And
The intra prediction mode of each of one or more sub-block sub-block is derived by using the IPDF of generation.
3. method according to claim 2, wherein generate IPDF using transformation model, and transformation model includes that rigid body becomes
Change, similarity transformation, affine transformation, homography conversion and 3D transformation at least one of.
4. method according to claim 2, wherein the intra prediction mode of the contiguous block used in the step of generating IPDF
Be include seed point seed block seed point intra prediction mode SPIPM, and
Seed point is that the size or shape based on current block or sub-block adaptively determines.
5. method as claimed in claim 4, wherein configure the list of SPIPM, wherein the list of SPIPM includes conduct
The intra prediction mode of the contiguous block of SPIPM candidate, and
SPIPM is selected from the list of SPIPM according to the quantity of SPIPM needed for generating IPDF.
6. method according to claim 2, wherein in contiguous block, derived intra prediction mode using IPDF when existing
Contiguous block when, IPDF based on the contiguous block generates the IPDF of current block.
7. the method for claim 1, wherein being derived positioned at current block most using the intra prediction mode of contiguous block
The intra prediction mode of the sub-block in outside,
It is derived using the intra prediction mode for the outermost sub-block for being located at current block pre- in the frame of at least one remaining sub-block
Survey mode, and
Deng the intra prediction mode and remaining sub-block for spatially deriving two sub-blocks being located in the outermost sub-block of current block
Intra prediction mode.
8. the method for claim 1, wherein being derived positioned at current block most using the intra prediction mode of contiguous block
The intra prediction mode of the sub-block in outside,
It is derived using the intra prediction mode for the outermost sub-block for being located at current block pre- in the frame of at least one remaining sub-block
Survey mode, and
It is derived by the bilinear interpolation of the intra prediction mode of two sub-blocks in the outermost sub-block of current block
The intra prediction mode of remaining sub-block.
9. a kind of image decoding apparatus including intraprediction unit,
Wherein, intraprediction unit is configured as:
It is one or more sub-blocks by current block subregion；
By using in the intra prediction mode of current block and the intra prediction mode of the contiguous block adjacent with current block at least
One derives the intra prediction mode of each of one or more sub-block sub-block；And
Each of one or more sub-block sub-block is executed in frame by using the intra prediction mode derived
Prediction.
10. a kind of image encoding method executed by video encoder, which comprises
It is one or more sub-blocks by current block subregion；
By using in the intra prediction mode of current block and the intra prediction mode of the contiguous block adjacent with current block at least
One determines the intra prediction mode of each of one or more sub-block sub-block；And
Each of one or more sub-block sub-block is executed by using determining intra prediction mode pre- in frame
It surveys.
11. method as claimed in claim 10, wherein the step of determining intra prediction mode include:
It is used for by using at least one of the intra prediction mode of current block and intra prediction mode of contiguous block to generate
The intra prediction direction field IPDF of current block；And
The intra prediction mode of each of one or more sub-block sub-block is determined by using the IPDF of generation.
12. method as claimed in claim 11, wherein IPDF is generated using transformation model, and
Transformation model includes at least one of rigid body translation, similarity transformation, affine transformation, homography conversion and 3D transformation.
13. method as claimed in claim 11, wherein the intra prediction mould of the contiguous block used in the step of generating IPDF
Formula be include seed point seed block seed point intra prediction mode SPIPM, and
Seed point is that the size or shape based on current block or sub-block adaptively determines.
14. method as claimed in claim 13, wherein configure the list of SPIPM, wherein the list of SPIPM includes conduct
The intra prediction mode of the contiguous block of SPIPM candidate, and
SPIPM is selected from the list of SPIPM according to the quantity of SPIPM needed for generating IPDF.
15. method as claimed in claim 11, wherein in contiguous block, derived intra prediction mould using IPDF when existing
When the contiguous block of formula, the IPDF based on the contiguous block generates the IPDF of current block.
16. method as claimed in claim 10, wherein determined using the intra prediction mode of contiguous block positioned at current block
The intra prediction mode of outermost sub-block,
It is determined using the intra prediction mode for the outermost sub-block for being located at current block pre- in the frame of at least one remaining sub-block
Survey mode, and
Intra prediction mode and remaining sub-block Deng two sub-blocks in the spatially determining outermost sub-block for being located at current block
Intra prediction mode.
17. method as claimed in claim 10, wherein determined using the intra prediction mode of contiguous block positioned at current block
The intra prediction mode of outermost sub-block,
It is determined using the intra prediction mode for the outermost sub-block for being located at current block pre- in the frame of at least one remaining sub-block
Survey mode, and
It is determined by the bilinear interpolation of the intra prediction mode of two sub-blocks in the outermost sub-block of current block
The intra prediction mode of remaining sub-block.
18. a kind of image encoding apparatus including intraprediction unit,
Wherein, intraprediction unit is configured as:
It is one or more sub-blocks by current block subregion；
By using in the intra prediction mode of current block and the intra prediction mode of the contiguous block adjacent with current block at least
One determines the intra prediction mode of each of one or more sub-block sub-block；And
Each of one or more sub-block sub-block is executed by using determining intra prediction mode pre- in frame
It surveys.
19. a kind of computer readable recording medium for storing the bit stream generated by image encoding method, described image coding staff
Method includes:
It is one or more sub-blocks by current block subregion；
By using in the intra prediction mode of current block and the intra prediction mode of the contiguous block adjacent with current block at least
One determines the intra prediction mode of each of one or more sub-block sub-block；And
Each of one or more sub-block sub-block is executed by using determining intra prediction mode pre- in frame
It surveys.
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| CN202311235479.2A CN117041568A (en) | 2016-11-29 | 2017-11-27 | Image encoding/decoding method and recording medium for storing bit stream |
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| CN112291558A (en) * | 2019-07-23 | 2021-01-29 | 杭州海康威视数字技术股份有限公司 | Encoding and decoding method, device and equipment |
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| CN116647696A (en) | 2018-09-06 | 2023-08-25 | Lg电子株式会社 | Image decoding method, image encoding method, storage medium, and transmission method |
| DK3700216T3 (en) | 2018-09-10 | 2022-09-12 | Lg Electronics Inc | Image coding based on affine motion prediction using affine MVP candidate list |
| EP4319164A3 (en) * | 2018-11-23 | 2024-03-27 | Intellectual Discovery Co., Ltd. | Inter-component prediction |
| CN110135308A (en) * | 2019-04-30 | 2019-08-16 | 天津工业大学 | A kind of direct free kick type identification method based on video analysis |
| CN110312127B (en) * | 2019-06-25 | 2022-04-19 | 浙江大华技术股份有限公司 | Method for constructing most probable prediction mode list, image coding method and processing device |
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| CN110024386B (en) | 2023-10-20 |
| CN117041568A (en) | 2023-11-10 |
| KR20240001097A (en) | 2024-01-03 |
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