WO2017052009A1 - 영상 코딩 시스템에서 amvr 기반한 영상 코딩 방법 및 장치 - Google Patents
영상 코딩 시스템에서 amvr 기반한 영상 코딩 방법 및 장치 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/136—Incoming video signal characteristics or properties
- H04N19/137—Motion inside a coding unit, e.g. average field, frame or block difference
- H04N19/139—Analysis of motion vectors, e.g. their magnitude, direction, variance or reliability
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
- H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/184—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being bits, e.g. of the compressed video stream
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
- H04N19/51—Motion estimation or motion compensation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
- H04N19/51—Motion estimation or motion compensation
- H04N19/513—Processing of motion vectors
- H04N19/517—Processing of motion vectors by encoding
- H04N19/52—Processing of motion vectors by encoding by predictive encoding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/70—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by syntax aspects related to video coding, e.g. related to compression standards
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
- H04N19/51—Motion estimation or motion compensation
- H04N19/513—Processing of motion vectors
- H04N19/517—Processing of motion vectors by encoding
Definitions
- the present invention relates to an image coding technology, and more particularly, to an image coding method and apparatus based on adaptive motion vector range (AMVR) in an image coding system.
- AMVR adaptive motion vector range
- the demand for high resolution and high quality images such as high definition (HD) images and ultra high definition (UHD) images is increasing in various fields.
- the higher the resolution and the higher quality of the image data the more information or bit rate is transmitted than the existing image data. Therefore, the image data can be transmitted by using a medium such as a conventional wired / wireless broadband line or by using a conventional storage medium. In the case of storage, the transmission cost and the storage cost are increased.
- a high efficiency image compression technique is required to effectively transmit, store, and reproduce high resolution, high quality image information.
- An object of the present invention is to provide a method and apparatus for improving image coding efficiency.
- Another object of the present invention is to provide a method and apparatus for improving the efficiency of inter prediction.
- Another technical problem of the present invention is to reduce bits allocated to MVD based on adaptive motion vector range (AMVR).
- AMVR adaptive motion vector range
- Another technical problem of the present invention is to provide an efficient MVD transmission / reception method based on a linear / non-linear MVD range.
- an image encoding method performed by an encoding apparatus includes generating an adaptive motion vector range (AMVR) enable flag, deriving a motion vector difference (MVD) for a current block, and an MVD range including a value of the MVD among a plurality of MVD ranges. Deriving an MVD representative value for the MVD representative, generating a coded MVD corresponding to the MVD representative value, and outputting the AMVR available flag and the coded MVD through a bitstream. .
- AMVR adaptive motion vector range
- an inter prediction method performed by a decoding apparatus includes obtaining an adaptive motion vector range (AMVR) enable flag from the bitstream, obtaining a coded motion vector difference (MVD) from the bitstream, and if the value of the AMVR available flag is 1 Deriving a representative MVD value corresponding to the value of the coded MVD, Deriving a motion vector predictor (MVP) for the current block based on neighboring blocks of the current block, The MVP And deriving a motion vector (MV) for the current block based on the representative MVD, and generating a predictive sample for the current block based on the MV.
- AMVR adaptive motion vector range
- MVD coded motion vector difference
- MVP motion vector predictor
- a decoding apparatus for performing inter prediction.
- the decoding apparatus includes: a decoding unit obtaining an adaptive motion vector range (AMVR) enable flag from a bitstream and a coded motion vector difference (MVD) from the bitstream, and a value of the AMVR available flag is 1;
- AMVR adaptive motion vector range
- MVD coded motion vector difference
- MVP motion vector predictor
- a prediction unit for deriving a motion vector (MV) for the current block based on the representative MVD and generating a predictive sample for the current block based on the MV.
- the present invention it is possible to efficiently perform inter prediction on the current block while using little additional information.
- the amount of bits allocated to the motion vector difference (MVD) may be reduced, thereby increasing the overall coding efficiency.
- FIG. 1 is a block diagram schematically illustrating a video encoding apparatus according to an embodiment of the present invention.
- FIG. 2 is a block diagram schematically illustrating a video decoding apparatus according to an embodiment of the present invention.
- FIG. 3 is a diagram schematically illustrating an embodiment of a candidate block that may be used when inter prediction is performed on a current block.
- 4 schematically illustrates positions of integer samples and fractional samples for quarter fractional sample interpolation in inter prediction.
- FIG. 5 shows an example of a method of inducing MV based on AMVR.
- FIG. 6 shows an AVMR method having a linear range.
- FIG. 8 shows an example of an AVMR method having a nonlinear range.
- FIG. 9 illustrates an example of constructing a nonlinear AMVR by parsing a nonlinear AVMR range parameter syntax according to the present invention.
- FIG. 10 shows an example of a non-linear AMVR method with adaptive MVD precision.
- FIG. 11 exemplarily illustrates a method for MVD derivation according to adaptive MVD precision according to the present invention.
- 12 to 14 exemplarily illustrate an MVD value decoding method in integer pel precision, half pel precision, or quarter pel precision according to the present invention.
- FIG 16 schematically shows an example of an inter prediction method according to the present invention.
- each of the components in the drawings described in the present invention are shown independently for the convenience of description of the different characteristic functions in the video encoding apparatus / decoding apparatus, each component is a separate hardware or separate software It does not mean that it is implemented.
- two or more of each configuration may be combined to form one configuration, or one configuration may be divided into a plurality of configurations.
- Embodiments in which each configuration is integrated and / or separated are also included in the present invention without departing from the spirit of the present invention.
- FIG. 1 is a block diagram schematically illustrating a video encoding apparatus according to an embodiment of the present invention.
- the encoding apparatus 100 may include a picture divider 105, a predictor 110, a transformer 115, a quantizer 120, a reordering unit 125, an entropy encoding unit 130, An inverse quantization unit 135, an inverse transform unit 140, a filter unit 145, and a memory 150 are provided.
- the picture dividing unit 105 may divide the input picture into at least one processing unit block.
- the block as the processing unit may be a prediction unit (PU), a transform unit (TU), or a coding unit (CU).
- a picture may be composed of a plurality of coding tree units (CTUs), and each CTU may be split into CUs in a quad-tree structure.
- a CU may be divided into quad tree structures with CUs of a lower depth.
- PU and TU may be obtained from a CU.
- a PU may be partitioned from a CU into a symmetrical or asymmetrical square structure.
- the TU may also be divided into quad tree structures from the CU.
- the predictor 110 includes an inter predictor for performing inter prediction and an intra predictor for performing intra prediction, as described below.
- the prediction unit 110 performs prediction on the processing unit of the picture in the picture division unit 105 to generate a prediction block including a prediction sample (or a prediction sample array).
- the processing unit of the picture in the prediction unit 110 may be a CU, a TU, or a PU.
- the prediction unit 110 may determine whether the prediction performed on the processing unit is inter prediction or intra prediction, and determine specific contents (eg, prediction mode, etc.) of each prediction method.
- the processing unit in which the prediction is performed and the processing unit in which the details of the prediction method and the prediction method are determined may be different.
- the method of prediction and the prediction mode may be determined in units of PUs, and the prediction may be performed in units of TUs.
- a prediction block may be generated by performing prediction based on information of at least one picture of a previous picture and / or a subsequent picture of the current picture.
- a prediction block may be generated by performing prediction based on pixel information in a current picture.
- a skip mode, a merge mode, an advanced motion vector prediction (AMVP), and the like can be used.
- a reference picture may be selected for a PU and a reference block corresponding to the PU may be selected.
- the reference block may be selected in units of integer pixels (or samples) or fractional pixels (or samples).
- a predictive block is generated in which a residual signal with the PU is minimized and the size of the motion vector is also minimized.
- a pixel, a pel, and a sample may be mixed with each other.
- the prediction block may be generated in integer pixel units, or may be generated in sub-pixel units such as 1/2 pixel unit or 1/4 pixel unit.
- the motion vector may also be expressed in units of integer pixels or less.
- Information such as an index of a reference picture selected through inter prediction, a motion vector difference (MVD), a motion vector predictor (MVD), and a residual signal may be entropy encoded and transmitted to a decoding apparatus.
- the prediction block may be a reconstruction block, the residual may not be generated, transformed, quantized, or transmitted.
- a prediction mode When performing intra prediction, a prediction mode may be determined in units of PUs, and prediction may be performed in units of PUs. In addition, a prediction mode may be determined in units of PUs, and intra prediction may be performed in units of TUs.
- the prediction mode may have, for example, 33 directional prediction modes and at least two non-directional modes.
- the non-directional mode may include a DC prediction mode and a planner mode (Planar mode).
- a prediction block may be generated after applying a filter to a reference sample.
- whether to apply the filter to the reference sample may be determined according to the intra prediction mode and / or the size of the current block.
- the residual value (the residual block or the residual signal) between the generated prediction block and the original block is input to the converter 115.
- the prediction mode information, the motion vector information, etc. used for the prediction are encoded by the entropy encoding unit 130 together with the residual value and transmitted to the decoding apparatus.
- the transform unit 115 performs transform on the residual block in units of transform blocks and generates transform coefficients.
- the transform block is a rectangular block of samples to which the same transform is applied.
- the transform block can be a transform unit (TU) and can have a quad tree structure.
- the transformer 115 may perform the transformation according to the prediction mode applied to the residual block and the size of the block.
- the residual block is transformed using a discrete sine transform (DST), otherwise the residual block is transformed into a DCT (Discrete). Can be transformed using Cosine Transform.
- DST discrete sine transform
- DCT Discrete
- the transform unit 115 may generate a transform block of transform coefficients by the transform.
- the quantization unit 120 may generate quantized transform coefficients by quantizing the residual values transformed by the transform unit 115, that is, the transform coefficients.
- the value calculated by the quantization unit 120 is provided to the inverse quantization unit 135 and the reordering unit 125.
- the reordering unit 125 rearranges the quantized transform coefficients provided from the quantization unit 120. By rearranging the quantized transform coefficients, the encoding efficiency of the entropy encoding unit 130 may be increased.
- the reordering unit 125 may rearrange the quantized transform coefficients in the form of a 2D block into a 1D vector form through a coefficient scanning method.
- the entropy encoding unit 130 entropy-codes a symbol according to a probability distribution based on the quantized transform values rearranged by the reordering unit 125 or the encoding parameter value calculated in the coding process, thereby performing a bitstream. You can output The entropy encoding method receives a symbol having various values and expresses it as a decodable column while removing statistical redundancy.
- the symbol means a syntax element, a coding parameter, a value of a residual signal, etc., to be encoded / decoded.
- An encoding parameter is a parameter necessary for encoding and decoding, and may include information that may be inferred in the encoding or decoding process as well as information encoded by an encoding device and transmitted to the decoding device, such as a syntax element. It means the information you need when you do.
- the encoding parameter may be, for example, a value such as an intra / inter prediction mode, a moving / motion vector, a reference image index, a coding block pattern, a residual signal presence, a transform coefficient, a quantized transform coefficient, a quantization parameter, a block size, block partitioning information, or the like. May include statistics.
- the residual signal may mean a difference between the original signal and the prediction signal, and a signal in which the difference between the original signal and the prediction signal is transformed or a signal in which the difference between the original signal and the prediction signal is converted and quantized It may mean.
- the residual signal may be referred to as a residual block in the block unit, and the residual sample in the sample unit.
- Encoding methods such as exponential golomb, context-adaptive variable length coding (CAVLC), and context-adaptive binary arithmetic coding (CABAC) may be used for entropy encoding.
- the entropy encoding unit 130 may store a table for performing entropy encoding, such as a variable length coding (VLC) table, and the entropy encoding unit 130 may store the variable length coding. Entropy encoding can be performed using the (VLC) table.
- the entropy encoding unit 130 derives the binarization method of the target symbol and the probability model of the target symbol / bin, and then uses the derived binarization method or the probability model to entropy. You can also perform encoding.
- the entropy encoding unit 130 may apply a constant change to a parameter set or syntax to be transmitted.
- the inverse quantizer 135 inversely quantizes the quantized values (quantized transform coefficients) in the quantizer 120, and the inverse transformer 140 inversely transforms the inverse quantized values in the inverse quantizer 135.
- the residual value (or the residual sample or the residual sample array) generated by the inverse quantizer 135 and the inverse transform unit 140 and the prediction block predicted by the predictor 110 are added together to reconstruct the sample (or the reconstructed sample array).
- a reconstructed block including a may be generated.
- a reconstructed block is generated by adding a residual block and a prediction block through an adder.
- the adder may be viewed as a separate unit (restore block generation unit) for generating a reconstruction block.
- the filter unit 145 may apply a deblocking filter, an adaptive loop filter (ALF), and a sample adaptive offset (SAO) to the reconstructed picture.
- ALF adaptive loop filter
- SAO sample adaptive offset
- the deblocking filter may remove distortion generated at the boundary between blocks in the reconstructed picture.
- the adaptive loop filter may perform filtering based on a value obtained by comparing the reconstructed image with the original image after the block is filtered through the deblocking filter. ALF may be performed only when high efficiency is applied.
- the SAO restores the offset difference from the original image on a pixel-by-pixel basis for the residual block to which the deblocking filter is applied, and is applied in the form of a band offset and an edge offset.
- the filter unit 145 may not apply filtering to the reconstructed block used for inter prediction.
- the memory 150 may store the reconstructed block or the picture calculated by the filter unit 145.
- the reconstructed block or picture stored in the memory 150 may be provided to the predictor 110 that performs inter prediction.
- the video decoding apparatus 200 includes an entropy decoding unit 210, a reordering unit 215, an inverse quantization unit 220, an inverse transform unit 225, a prediction unit 230, and a filter unit 235.
- Memory 240 may be included.
- the input bitstream may be decoded according to a procedure in which image information is processed in the video encoding apparatus.
- the entropy decoding unit 210 may entropy decode the input bitstream according to a probability distribution to generate symbols including symbols in the form of quantized coefficients.
- the entropy decoding method is a method of generating each symbol by receiving a binary string.
- the entropy decoding method is similar to the entropy encoding method described above.
- VLC variable length coding
- 'VLC' variable length coding
- CABAC CABAC
- the CABAC entropy decoding method receives a bin corresponding to each syntax element in a bitstream, and decodes syntax element information and decoding information of neighboring and decoding target blocks or information of symbols / bins decoded in a previous step.
- the context model may be determined using the context model, the probability of occurrence of a bin may be predicted according to the determined context model, and arithmetic decoding of the bin may be performed to generate a symbol corresponding to the value of each syntax element. have.
- the CABAC entropy decoding method may update the context model by using the information of the decoded symbol / bin for the context model of the next symbol / bean after determining the context model.
- Information for generating the prediction block among the information decoded by the entropy decoding unit 210 is provided to the predictor 230, and a residual value where entropy decoding is performed by the entropy decoding unit 210, that is, a quantized transform coefficient It may be input to the reordering unit 215.
- the reordering unit 215 may reorder the information of the bitstream entropy decoded by the entropy decoding unit 210, that is, the quantized transform coefficients, based on the reordering method in the encoding apparatus.
- the reordering unit 215 may reorder the coefficients expressed in the form of a one-dimensional vector by restoring the coefficients in the form of a two-dimensional block.
- the reordering unit 215 scans the coefficients based on the prediction mode applied to the current block (transform block) and the size of the transform block to generate an array of coefficients (quantized transform coefficients) in the form of a two-dimensional block. Can be.
- the inverse quantization unit 220 may perform inverse quantization based on the quantization parameter provided by the encoding apparatus and the coefficient values of the rearranged block.
- the inverse transform unit 225 may perform inverse DCT and / or inverse DST on the DCT and the DST performed by the transform unit of the encoding apparatus with respect to the quantization result performed by the video encoding apparatus.
- the inverse transformation may be performed based on a transmission unit determined by the encoding apparatus or a division unit of an image.
- the DCT and / or DST in the encoding unit of the encoding apparatus may be selectively performed according to a plurality of pieces of information, such as a prediction method, a size and a prediction direction of the current block, and the inverse transform unit 225 of the decoding apparatus is configured in the transformation unit of the encoding apparatus.
- Inverse transformation may be performed based on the performed transformation information.
- the prediction unit 230 may include prediction samples (or prediction sample arrays) based on prediction block generation related information provided by the entropy decoding unit 210 and previously decoded block and / or picture information provided by the memory 240.
- a prediction block can be generated.
- intra prediction for generating a prediction block based on pixel information in the current picture may be performed.
- inter prediction on the current PU may be performed based on information included in at least one of a previous picture or a subsequent picture of the current picture.
- motion information required for inter prediction of the current PU provided by the video encoding apparatus for example, a motion vector, a reference picture index, and the like, may be derived by checking a skip flag, a merge flag, and the like received from the encoding apparatus.
- a prediction block may be generated such that a residual signal with a current block is minimized and a motion vector size is also minimized.
- the motion information derivation scheme may vary depending on the prediction mode of the current block.
- Prediction modes applied for inter prediction may include an advanced motion vector prediction (AMVP) mode, a merge mode, and the like.
- AMVP advanced motion vector prediction
- the encoding apparatus and the decoding apparatus may generate a merge candidate list by using the motion vector of the reconstructed spatial neighboring block and / or the motion vector corresponding to the Col block, which is a temporal neighboring block.
- the motion vector of the candidate block selected from the merge candidate list is used as the motion vector of the current block.
- the encoding apparatus may transmit, to the decoding apparatus, a merge index indicating a candidate block having an optimal motion vector selected from candidate blocks included in the merge candidate list. In this case, the decoding apparatus may derive the motion vector of the current block by using the merge index.
- the encoding device and the decoding device use a motion vector corresponding to a motion vector of a reconstructed spatial neighboring block and / or a Col block, which is a temporal neighboring block, and a motion vector.
- a predictor candidate list may be generated. That is, the motion vector of the reconstructed spatial neighboring block and / or the Col vector, which is a temporal neighboring block, may be used as a motion vector candidate.
- the encoding apparatus may transmit the predicted motion vector index indicating the optimal motion vector selected from the motion vector candidates included in the list to the decoding apparatus. In this case, the decoding apparatus may select the predicted motion vector of the current block from the motion vector candidates included in the motion vector candidate list using the motion vector index.
- the encoding apparatus may obtain a motion vector difference MVD between the motion vector MV of the current block and the motion vector predictor MVP, and may encode the same and transmit the encoded motion vector to the decoding device. That is, MVD may be obtained by subtracting MVP from MV of the current block.
- the decoding apparatus may decode the received motion vector difference and derive the motion vector of the current block through the addition of the decoded motion vector difference and the motion vector predictor.
- the encoding apparatus may also transmit a reference picture index or the like indicating the reference picture to the decoding apparatus.
- the decoding apparatus may predict the motion vector of the current block using the motion information of the neighboring block, and may derive the motion vector for the current block using the residual received from the encoding apparatus.
- the decoding apparatus may generate a prediction block for the current block based on the derived motion vector and the reference picture index information received from the encoding apparatus.
- the encoding apparatus and the decoding apparatus may generate the merge candidate list using the motion information of the reconstructed neighboring block and / or the motion information of the call block. That is, the encoding apparatus and the decoding apparatus may use this as a merge candidate for the current block when there is motion information of the reconstructed neighboring block and / or the call block.
- the encoding apparatus may select a merge candidate capable of providing an optimal encoding efficiency among the merge candidates included in the merge candidate list as motion information for the current block.
- a merge index indicating the selected merge candidate may be included in the bitstream and transmitted to the decoding apparatus.
- the decoding apparatus may select one of the merge candidates included in the merge candidate list by using the transmitted merge index, and determine the selected merge candidate as motion information of the current block. Therefore, when the merge mode is applied, motion information corresponding to the reconstructed neighboring block and / or the call block may be used as the motion information of the current block.
- the decoding apparatus may reconstruct the current block by adding the prediction block and the residual transmitted from the encoding apparatus.
- the motion information of the reconstructed neighboring block and / or the motion information of the call block may be used to derive the motion information of the current block.
- the encoding apparatus does not transmit syntax information such as residual to the decoding apparatus other than information indicating which block motion information to use as the motion information of the current block.
- the encoding apparatus and the decoding apparatus may generate the prediction block of the current block by performing motion compensation on the current block based on the derived motion information.
- the prediction block may mean a motion compensated block generated as a result of performing motion compensation on the current block.
- the plurality of motion compensated blocks may constitute one motion compensated image.
- the reconstruction block may be generated using the prediction block generated by the predictor 230 and the residual block provided by the inverse transform unit 225.
- the reconstructed block is generated by combining the prediction block and the residual block in the adder.
- the adder may be viewed as a separate unit (restore block generation unit) for generating a reconstruction block.
- the reconstruction block includes a reconstruction sample (or reconstruction sample array) as described above
- the prediction block includes a prediction sample (or a prediction sample array)
- the residual block is a residual sample (or a residual sample). Array).
- a reconstructed sample (or reconstructed sample array) may be expressed as the sum of the corresponding predictive sample (or predictive sample array) and the residual sample (residual sample array).
- the residual is not transmitted for the block to which the skip mode is applied, and the prediction block may be a reconstruction block.
- the reconstructed block and / or picture may be provided to the filter unit 235.
- the filter unit 235 may apply deblocking filtering, sample adaptive offset (SAO), and / or ALF to the reconstructed block and / or picture.
- SAO sample adaptive offset
- the memory 240 may store the reconstructed picture or block to use as a reference picture or reference block and provide the reconstructed picture to the output unit.
- Components directly related to the decoding of an image for example, an entropy decoding unit 210, a reordering unit 215, an inverse quantization unit 220, an inverse transform unit 225, a prediction unit 230, and a filter unit ( 235) and the like may be distinguished from other components by a decoder or a decoder.
- the decoding apparatus 200 may further include a parsing unit (not shown) for parsing information related to the encoded image included in the bitstream.
- the parsing unit may include the entropy decoding unit 210 or may be included in the entropy decoding unit 210. Such a parser may also be implemented as one component of the decoder.
- FIG 3 is a diagram schematically illustrating an embodiment of a candidate block that may be used when inter prediction is performed on a current block.
- the current block may be a prediction block.
- the prediction unit of the encoding apparatus and the decoding apparatus may use the reconstructed neighboring block at a predetermined position around the current block 300 as a candidate block.
- two blocks A0 310 and A1 320 positioned to the left of the current block and three blocks B0 330, B1 340, and B2 350 located above the current block are spatially ( spatial) candidate blocks.
- A0 310 may be referred to as a lower left neighboring block
- A1 320 may be referred to as a left neighboring block.
- B0 330 may be referred to as an upper right neighboring block
- B1 340 may be referred to as an upper neighboring block
- B2 350 may be referred to as an upper left neighboring block.
- the Col block 360 described above may be used as a candidate block as a temporal candidate block in addition to the spatially adjacent blocks.
- the Col block 360 may be referred to as a Col prediction block (ColPb), and is a block corresponding to the current block in a collocated picture, which is one of reconstructed reference pictures, and has a predetermined relative position (eg, The number of blocks that exist at an arithmetic shift according to a predetermined criterion from the lower right peripheral sample position or the center lower right sample position of the block existing at the same position as the current block in the Col picture. have.
- a predetermined relative position eg, The number of blocks that exist at an arithmetic shift according to a predetermined criterion from the lower right peripheral sample position or the center lower right sample position of the block existing at the same position as the current block in the Col picture. have.
- an optimal MVP for the current block is selected from an MVP candidate list including motion vector predictor (MVP) candidates derived from candidate blocks.
- the encoding apparatus derives an optimal MVP from the MVP candidate list based on the MV of the current block derived by performing motion estimation, and calculates an MVD obtained by subtracting the MVP from the MV.
- the encoding apparatus encodes the bitstream by encoding MVP index information indicating which MVP candidate is the MVP for the current block among the MVP candidates included in the MVP candidate list, and MVD information indicating the x-axis value and the y-axis value of the obtained MVD. Through the transmission to the decoding device.
- the decoding apparatus may derive the MVP for the current block from the MVP candidate list based on the MVP index information and the MVD information transmitted from the encoding apparatus, and derive the MV of the current block by adding the MVD to the derived MVP.
- a reference block on a reference picture may be derived based on the MV of the current block, and the reference block may be used as a prediction block for the current block. That is, samples in the reference block may be used as prediction samples for the current block.
- the decoding apparatus may receive the information about the residual sample from the encoding apparatus to generate the residual samples.
- the information about the residual sample may include information about transform coefficients.
- the decoding apparatus may receive transform coefficients from the encoding apparatus through a bitstream, and inversely transform the transform coefficients to generate a residual block (or residual samples).
- the residual sample may indicate a difference between the original sample and the prediction sample
- the residual block may indicate a difference between the original block including the original samples and the prediction block including the prediction samples.
- the motion vector may have a sample resolution of less than or equal to an integer unit. For example, it may have a 1/4 sample resolution for the luma component. Therefore, by generating a quarter sample from an integer sample or full sample through interpolation on a reference picture and selecting a reference block in an area including the fraction sample, the current block is selected. May refer to a more similar reference block.
- Fractional samples of integer units or less may be generated through interpolation filters based on integer samples.
- a luma component sample hereinafter, referred to as a luma sample
- the resolution of the motion vector is 1/4 fractional samples
- the encoding apparatus and the decoding apparatus generate sub-integer sample information in units of 1/4 samples through interpolation. can do.
- an 8-tap interpolation filter with different filter coefficients can be used.
- FIG. 4 schematically illustrates positions of integer samples and fractional samples for quarter fractional sample interpolation in inter prediction.
- shaded (or capitalized) positions correspond to integer samples
- shaded (or lowercase) positions correspond to fractional samples.
- Table 1 below shows an example of filter coefficients according to sample positions.
- the filter coefficients can be applied to a sample of luma components.
- fractional samples of FIG. 4 may be derived by applying an 8-tap filter based on the filter coefficients.
- the reference block can be detected in fractional sample units, MV in fractional sample units can be derived, and inter prediction can be performed more precisely.
- the MVD must also be indicated in fractional sample units, and the amount of data allocated to the MVD is relatively increased.
- coding efficiency may be increased by adaptively adjusting the range or resolution of the motion vector.
- This may be called an adaptive motion vector range (AMVR), and MV may be determined in units of 1/2 fractional samples (or half samples) or integer samples to reduce side information.
- MV adaptive motion vector range
- a uniform fractional sample unit, an integer sample unit, or the like may be used in the whole range, or a range of sample units may be set differently according to the area.
- the former can be called a linear AMVR and the latter can be called a non-linear AMVR.
- a method of inducing MV based on AMVR is as follows.
- FIG. 5 shows an example of a method of inducing MV based on AMVR.
- the method disclosed in FIG. 5 may be performed by a decoding apparatus.
- the decoding apparatus derives one MVP from a list of MVP candidates configured based on spatial neighboring blocks and temporal corresponding blocks of the current block.
- the MVP may be the MV of one of the spatial neighboring blocks and the temporal corresponding block, and thus may be the original quarter fractional pel unit.
- the decoding apparatus derives the MVP of the integer pel unit through the rounding procedure.
- the MVD may be received in integer pel units, in which case the decoding apparatus scales up the received MVD.
- the decoding apparatus scales up the value of MVD to distinguish the quarter fractional pel unit and derives the MVD of the integer pel unit. That is, the value 1 of the MVD in quarter pel units could represent a quarter fractional pel, and the value 4 could represent one integer pel. A value of 4 can be made to represent 4 integer pels.
- the decoding apparatus derives the MV of the integer pel unit based on the MVP of the integer pel unit and the MVD of the integer pel unit.
- the decoding apparatus may derive the MV of the integer pel unit by adding the MVP of the integer pel unit and the MVD of the integer pel unit.
- pixels, pels, and samples may be mixed with each other.
- the encoding apparatus determines a first (temporary) MV by finding a sample position having an optimum rate-distortion cost through motion estimation.
- the first MV may be an MV in fractional pel units.
- the encoding apparatus generates an AMVP candidate list and derives the first MVP in the same manner as the decoding apparatus.
- the first MVP may be a fractional pel unit.
- the encoding apparatus rounds off the first MVP to derive a second MVP in an integer pel unit.
- the encoding apparatus generates a first MVD based on the difference between the first MV and the first MVP, and then rounds up the first MVD to derive a second MVD in an integer Pel unit.
- the encoding apparatus derives a second MV in integer whole units based on the addition of the second MVP and the second MVD.
- the encoding apparatus compares the RD cost based on the first MV with the RD cost based on the second MV, and selects a mode having a better RD cost (ie, a lower RD cost).
- a mode for performing prediction based on the first MV may be called a normal mode
- a mode for performing prediction based on the second MV may be called an AMVR mode.
- AMVR is a method of reducing the absolute size (ie, bit amount) of MVD to be coded by expressing MV in integer pel units.
- the MVD may be transmitted through a syntax, for example, as shown in Table 2 below.
- the syntax may be included in the bitstream and transmitted.
- abs_mvd_grater0_flag [0/1] indicates whether the absolute value of the x component / y component of the motion vector difference is greater than zero.
- abs_mvd_grater1_flag [0/1] indicates whether the absolute value of the x component / y component of the motion vector difference is greater than one.
- abs_mvd_grater1_flag [0/1] may be transmitted and received and parsed when abs_mvd_grater0_flag [0/1] is true (that is, when the value of abs_mvd_grater0_flag [0/1] is 1).
- abs_mvd_minus2 [0/1] plus 2 represents the absolute value of the x component / y component of the motion vector difference.
- abs_mvd_minus2 [0/1] may be transmitted and received and parsed when abs_mvd_grater1_flag [0/1] is true (that is, when the value of abs_mvd_grater1_flag [0/1] is 1).
- mvd_sign_flag [0/1] represents a sign of an x component / y component of a motion vector difference.
- the x component / y component of the motion vector difference has a positive value.
- the value of mvd_sign_flag [0/1] is 1, the x component / y component of the motion vector difference has a negative value.
- mvd_sign_flag [0/1] may be transmitted / received and parsed when abs_mvd_grater1_flag [0/1] is abs_mvd_grater0_flag [0/1] is true (that is, when the value of abs_mvd_grater0_flag [0/1] is 1). .
- the absolute value of the MVD can be reduced since it can be expressed in integer pel units, thereby reducing the transmitted bits. have.
- a nonlinear MV range may be applied.
- an integer pel unit or more units is used to increase the correlation of the predicted value to increase energy compaction, and a range of not only the integer pel to the range where the predicted value is less correlated
- the half pel and quarter pel positions can be adaptively represented to obtain bit savings while maintaining the accuracy of the prediction.
- Embodiment 1 of the present invention a method for efficiently performing bit transmission by efficiently performing energy compression of MVD while maintaining a linear MVD range is provided.
- FIG. 6 shows an AVMR method having a linear range.
- the linear MVD range may be based on a method of scaling down the MVD value of the quarter pel unit by a multiple of 4 and then down to 4. That is, in this case, for example, the MVD of the quarter pel unit having a value of -4 to -1 becomes the MVD of the integer pel unit having a value of -1, and the MVD of the quarter pel unit having a value of 0 to 3 is 0 It becomes MVD of the integral pel unit which has a value, and the MVD of the quarter pel unit which has a value of 4-7 becomes the MVD of the integral pel unit which has a value.
- the MVD related syntax checks whether the absolute value of the MVD is greater than 0, and transmits 1 bit abs_mvd_grater0_flag having a value of 0 if not greater than 0. On the other hand, if the magnitude of the absolute value of the MVD is greater than 0, it is additionally checked to be greater than 1, and if it is not greater than 1, one bit of abs_mvd_grater1_flag having a value of 0 is additionally transmitted. On the other hand, if both cases are not satisfied (that is, when MVD is greater than or equal to 2), the value obtained by subtracting 2 from the absolute value of MVD is coded and transmitted based on the first-order exponential golem.
- the balanced linear MVD range may be based on a method of decreasing the MVD value plus 2 of the quarter pel unit by a multiple of 4 and then scaling down to 4. That is, in this case, for example, the MVD of the quarter pel unit having a value of -6 to -3 becomes the MVD of the integer pel unit having a value of -1 represented by the representative value -4, and the value of -2 to 1
- the MVD of the quarter pel unit having is represented by the representative value 0 and becomes the MVD of the integer fel unit having a value of 0, and the MVD of the quarter pel unit having a value of 2 to 5 is the integer pel represented by the representative value 4 and having a value of 1 It is the MVD of the unit.
- the balanced linear MVD range may be based on a method of decreasing the MVD value plus one of quarter quarter units plus one to a multiple of four and then scaling down to four.
- Embodiment 2 of the present invention by applying a non-linear MVD range instead of a linear MVD range, a method of reducing the amount of bits to be transmitted is provided by increasing the ratio of using abs_mvd_grater0_flag or abs_mvd_grater1_flag.
- FIG. 8 shows an example of an AVMR method having a nonlinear range.
- the non-linear MVD range may be based on 8 units of the scaleable range of MVD values in quarter-pel units to ⁇ 1, 0, and 1, and the remaining range of 4 units. That is, for the central region, the MVD value plus 4 of the quarter pel unit may be lowered to a multiple of 8 and then scaled down to 8.
- the MVD of a quarter pel unit having a value of -12 to -5 is represented by a representative value of -8 and scaled down to an MVD of an integer pel unit having a value of -1, having a value of -4 to 3
- the MVD of the quarter pel unit is represented by the representative value 0 and scaled down to the MVD of the integer fel unit having a value of 0, and the MVD of the quarter pel unit having the values of 4 to 11 is represented by the representative value 8 and scaled down to 1 It becomes MVD of the integer pel unit which has a value.
- the MVD belonging to the nonlinear range is represented by a representative value of the corresponding range, and the value after performing the adaptive scale-down according to the range is coded and transmitted through the bitstream.
- energy compression may be improved by increasing the ratio represented by 0 or 1 of the MVD value coded and transmitted.
- nonlinear AMVR may be indicated through a non_linear_amvr_range_flag syntax element as shown in the following table.
- amvr_enable_flag indicates whether the AMVR mode is available.
- non_linear_amvr_range_flag indicates whether a nonlinear AMVR range is applied.
- the non_linear_amvr_range_flag may be transmitted and received and parsed when the value of amvr_enable_flag is 1.
- the syntax disclosed in Table 3 may be included in, for example, a sequence parameter set (SPS) syntax.
- SPS sequence parameter set
- the nonlinear AMVR range is not applied. That is, in this case, the linear AMVR range is applied in representing the MVD.
- the nonlinear AMVR range may be applied. That is, the decoding apparatus may determine whether the nonlinear AMVR range is applied based on the non_linear_amvr_range_flag.
- the decoding apparatus knows information about the nonlinear range and range representative value information.
- the value of the non_linear_amvr_range_flag is 1, if there is no additional information, the predetermined default nonlinear range may be used.
- Embodiment 3 of the present invention provides a method for indicating a specific nonlinear AMVR range in addition to Embodiment 2 described above.
- amvr_enable_flag when the value of amvr_enable_flag is 1, it may indicate whether a linear AMVR range or a nonlinear AMVR range is to be used through non_linear_amvr_range_flag.
- the nonlinear AMVR is shown in the following table. Range related parameters may be transmitted to adaptively inform the decoding apparatus of the nonlinear AMVR range.
- sps_amvr_enable_flag indicates whether the AMVR mode is available.
- the sps_amvr_enable_flag may be mixed with amvr_enable_flag.
- non_linear_amvr_range_flag indicates whether a nonlinear AMVR range is applied.
- the non_linear_amvr_range_flag may be transmitted and received and parsed when the value of sps_amvr_enable_flag is 1.
- the non_linear_amvr_range_paramter syntax may be further transmitted and received and parsed / called.
- the non_linear_amvr_range_parameter syntax indicates the nonlinear AMVR range related parameters.
- the nonlinear AMVR range related parameters may be divided into three ranges, for example, to indicate a range value corresponding to each position and a representative value of the range.
- the nonlinear AMVR range related parameters may include, for example, the following syntax elements.
- num_non_linear_range_table_candidate represents the number of nonlinear range table candidates.
- Each nonlinear range table candidate may include first_range_value, first_range_representative_value, second_range_value, second_range_representative_value, third_range_value, and third_range_representative_value.
- the encoding apparatus may indicate one of the nonlinear range table candidates through a range table index. Meanwhile, if one nonlinear range table is used or a fixed number is used, the num_non_linear_range_table_candidate may be omitted.
- the first_range_value, the second_range_value, and the third_range_value indicate a first range value, a second range value, and a third range value centered on zero, respectively.
- the first range is a range including zero.
- the first_range_value, second_range_value, and third_range_value may each represent a value of 0 or more.
- first_range_representative_value, second_range_representative_value, and third_range_representative_value each represent a representative value of a related range.
- the value of the second_range_value is b and the value of the second_range_representative_value is m
- -b ⁇ MVD ⁇ -a and a ⁇ MVD ⁇ b become the second range, and the representative values of the second range are respectively.
- -m and m are respectively.
- the value of the third_range_value is c and the value of the third_range_representative_value is n
- -c ⁇ MVD ⁇ -b and b ⁇ MVD ⁇ c become the third range
- the representative value of the third range is -n, respectively.
- FIG. 9 illustrates an example of constructing a nonlinear AMVR by parsing a nonlinear AVMR range parameter syntax according to the present invention.
- a positive domain is mainly shown and described.
- the value of the first_range_value is 6, the value of the first_range_representative_value is 0, the value of the second_range_value is 10, the value of the second_range_representative_value is 8, the value of the third_range_value is 14, and the value of the third_range_representative_value is 12.
- the first range is ⁇ 6 ⁇ MVD ⁇ 6, and the representative value for the first range is zero.
- the second range of positive domains is 6 ⁇ MVD ⁇ 10 and the representative value for the second range is 8.
- the third range of the positive domain is 10 ⁇ MVD ⁇ 14 and the representative value for the third range is 12.
- Representative values for the first to third ranges may be scaled down to correspond to 0, 1, and 2, respectively.
- the nonlinear AMVR range can be derived as shown in (a).
- the portion (e.g., the range 13 to 17), and so on denoted here represent the remaining ranges other than the first to the third range, the remaining ranges may be set according to a predefined criterion.
- the value of the first_range_value is 4, the value of the first_range_representative_value is 0, the value of the second_range_value is 12, the value of the second_range_representative_value is 8, the value of the third_range_value is 16, and the value of the third_range_representative_value.
- the value is 14.
- the first range is ⁇ 4 ⁇ MVD ⁇ 4, and the representative value for the first range is zero.
- the second range of positive domains is 4 ⁇ MVD ⁇ 12, with a representative value of 8 for the second range.
- the third range of positive domains is 12 ⁇ MVD ⁇ 16 and the representative value for the third range is 14.
- Representative values for the first to third ranges may be scaled down to correspond to 0, 1, and 2, respectively.
- the nonlinear AMVR range can be derived as shown in (a).
- the encoding apparatus may indicate one of the candidates based on the range table index, and the decoding apparatus may receive and parse the range table index to receive the candidates. You can choose one.
- the range table index may be transmitted through the following syntax, for example.
- slice_non_linear_ambr_range_table_idx may indicate the above range table index.
- the slice_non_linear_ambr_range_table_idx may be transmitted and received and parsed when the value of non_linear_amvr_range_flag (or sps_non_linear_amvr_flag) described above in Table 4 is 1.
- the slice_non_linear_ambr_range_table_idx may be transmitted in the slice header stage. That is, the slice_non_linear_ambr_range_table_idx syntax element may be transmitted through a slice segment header syntax regarding a slice including the current block.
- the current block may be a PU or a PB.
- the decoding apparatus may derive the MVD based on range values for the nonlinear range table candidates corresponding to the index indicated by the slice_non_linear_ambr_range_table_idx.
- the expression unit of the MVD can be adaptively changed according to the range.
- the expression unit of the MVD may be adaptively changed to an integer pel unit, a half pel unit, a quarter pel unit, or the like.
- FIG. 10 shows an example of a non-linear AMVR method with adaptive MVD precision.
- the range -8 ⁇ MVD ⁇ 8 has integer pel precision
- the range -18 ⁇ MVD ⁇ -8 and 8 ⁇ MVD ⁇ 18 has half pel precision
- the range -24 ⁇ MVD ⁇ -18 And 18 ⁇ MVD ⁇ 24 were set to have quarter pel precision. That is, in this case, the encoding apparatus derives the MVD with integer pel precision in the range of -8 ⁇ MVD ⁇ 8, and derives the MVD with half pel precision in the range of -18 ⁇ MVD ⁇ -8 and 8 ⁇ MVD ⁇ 18
- the -24 ⁇ MVD ⁇ -18 range and 18 ⁇ MVD ⁇ 24 range can derive the MVD with quarter pel precision.
- the encoding apparatus reduces the bit amount of MVD by estimating and expressing the MV predicted according to the relationship between distortion and rate during the RD optimization process in integer Pel units when it belongs to a high correlation range.
- the distortion can be further reduced by estimating and expressing in a lower unit (for example, half pel or quarter pel).
- FIG. 11 exemplarily illustrates a method for MVD derivation according to adaptive MVD precision according to the present invention.
- the method of FIG. 11 may be performed by a decoding apparatus.
- the decoding apparatus parses an MVD (S1100). Parsing an MVD includes receiving and parsing an MVD related syntax.
- the decoding apparatus checks whether the MVD has an integer pel precision based on the range to which the coded value of the MVD belongs (S1110).
- the decoding apparatus derives a representative value for the coded value of the MVD in consideration of the integer pel precision (S1120).
- the decoding apparatus checks whether the MVD has half pel precision based on a range to which the coded value of the MVD belongs (S1130).
- the decoding apparatus derives a representative value for the coded value of the MVD in consideration of the half pel precision (S1140).
- the decoding apparatus derives a representative value for the coded value of the MVD in consideration of the quarter pel precision. (S1150).
- 12 to 14 exemplarily illustrate an MVD value decoding method in integer pel precision, half pel precision, or quarter pel precision according to the present invention.
- the range ⁇ 8 MVD < 18 has a half pel precision
- the decoding apparatus decodes the encoded 0 value to obtain a 0 value.
- the decoding apparatus may derive the MV for the current block by adding the MVD of 0 to the MVP.
- the 11 is represented by the representative value 10
- the 10 is scaled down and encoded into a 1 value, and the decoding apparatus decodes the encoded 1 value. , Scale up to obtain 10 as the MVD value.
- the decoding apparatus may decode the encoded 6 value and obtain a value of 21 as the MVD value corresponding to the coded value 6.
- the decoding apparatus may decode the three values and obtain a value of 20 as the MVD value corresponding to the three.
- the range information for the adaptive MVD precision may be indicated based on the SPS syntax and the slice header syntax as described above in the third embodiment.
- the SPS syntax may include a syntax element regarding the number of MVD precision range table candidates, and may include information on at least one of integer pel precision range and half pel precision range for each MVD precision range table candidate. Can be.
- a precision range table index indicating one candidate among the MVD precision range table candidates may be indicated through the slice header syntax.
- the syntax for the nonlinear AMVR range parameters may include information about the integer pel precision range and the half pel precision range, as shown in the following table.
- num_non_linear_range_table_candidate represents the number of nonlinear range table candidates.
- Each nonlinear range table candidate may include integer_pel_precision_range and half_pel precision_range syntax elements.
- integer_pel_precision_range represents an integer pel precision range
- half_pel precision_range represents a half pel precision range.
- the integer pel precision range and the half pel precision range may be used in combination with first to third ranges based on first_range_value, first_range_representative_value, second_range_value, second_range_representative_value, third_range_value and third_range_representative_value of Table 7.
- a value representing each precision range may be scaled down and transmitted.
- the value represented by integer_pel_precision_range may be scaled down to 4 and transmitted, and the value represented by half_pel precision_range may be transmitted after the difference value with the value represented by integer_pel_precision_range scales down to 2.
- FIG. 10 8 which is a value represented by integer_pel_precision_range, is scaled down to 4 and transmitted as a value of 2, and 5, which is 10, which is 10 minus 8 from 18, which is a value represented by integer_pel_precision_range, is transmitted to 2.
- the decoding apparatus may decode each precision range through a procedure opposite to the above procedure.
- FIG. 15 schematically illustrates an example of an image coding method according to the present invention.
- the method disclosed in FIG. 15 may be performed by an encoding device.
- the encoding apparatus generates an AMVR available flag (S1500).
- the encoding apparatus determines whether to perform AMVR for inter prediction on the current block. If the encoding apparatus determines that performing the AMVR is better for RD optimization, the encoding apparatus may determine to perform the AMVR and set the value of the AMVR available flag to 1.
- the encoding apparatus derives the MVD for the current block (S1510).
- the MVD may be MVD in quarter pel units.
- the MVD may be integral or half pel units depending on the MVD precision range.
- the encoding apparatus may derive the MV for the current block through motion estimation.
- the encoding apparatus may derive an MVP for the current block based on the spatial neighboring blocks and the temporal neighboring block (or temporal corresponding block) of the current block.
- the encoding apparatus may derive the MVP for the current block based on the MV and the MVP.
- the MVP may be an MVP in quarter quarter units.
- the MVP may be an MVP of an integer pel unit, rounded up a temporary MVP of a quarter pel unit to an integer pel unit.
- the encoding apparatus derives an MVD representative value for the MVD range including the value of the MVD among a plurality of MVD ranges (S1520), and generates a coded MVD corresponding to the MVD representative value (S1530).
- the plurality of MVD ranges may be linear MVD ranges having an equivalent range.
- the MVD representative value may be a value obtained by rounding down the value of the MVD plus 2 to a multiple of 4.
- the coded MVD may be a value obtained by scaling down the MVD representative value to 4.
- the plurality of MVD ranges may be non-linear MVD ranges having non-uniform ranges.
- the MVD ranges located in the center region of the nonlinear MVD ranges may have a relatively wide range.
- MVD ranges corresponding to the coded MVD values ⁇ 1, 0, and 1 of the nonlinear MVD ranges may have a relatively wider range than the remaining MVD ranges.
- the coded MVD value is one of -1, 0, 1
- the MVD representative value may be a value obtained by rounding down the value of the MVD plus 4 to a multiple of 8.
- the coded MVD value may be a value obtained by scaling down the MVD representative value to 8.
- the encoding apparatus outputs the AMVR available flag and the coded MVD through a bitstream (S1540).
- the AMVR available flag may be output through the bitstream at the SPS level.
- the coded MVD may be output through the bitstream at the PU level.
- the output bitstream may be transmitted to a decoding apparatus through a network or a storage medium.
- the encoding apparatus may generate a non-linear AMVR range flag indicating whether the plurality of MVD ranges have an uneven range.
- the value 0 of the nonlinear AMVR range flag may indicate that the plurality of MVD ranges have an equal range, and the value 1 of the nonlinear AMVR range flag may indicate that the plurality of MVD ranges have an uneven range.
- the encoding apparatus may output the generated nonlinear AMVR flag through the bitstream.
- the encoding apparatus may generate a nonlinear AMVR related parameter and output it through the bitstream.
- the nonlinear AMVR related parameters may include the information described above in Tables 5 and 7 above.
- the nonlinear AMVR range related parameter may include information on the size of the center three MVD ranges of the MVD ranges and representative values of the ranges.
- the nonlinear AMVR range related parameter may include information about the number of nonlinear range table candidates.
- the nonlinear AMVR range related parameter may include information about the size of the central three MVD ranges corresponding to each of the nonlinear range table candidates and representative values of the corresponding ranges.
- the encoding apparatus may generate a range table index pointing to one of the nonlinear range table candidates, and output the range table index through the bitstream.
- the range table index may be output through the bitstream at the slice header level.
- the expression unit of the MVD can be adaptively changed according to the range.
- the encoding apparatus may generate MVD precision information indicating whether the MVD has integer pel precision or half pel precision, and output the MVD precision information through the bitstream.
- the MVD precision information may include, for example, at least one of the above-described integer_pel_precision_range syntax element and half_pel_precision_range syntax element.
- FIG. 16 schematically shows an example of an inter prediction method according to the present invention.
- the method disclosed in FIG. 16 may be performed by a decoding apparatus.
- the decoding apparatus parses and obtains an AMVR available flag from a bitstream received from an encoding apparatus (S1600).
- the decoding device may receive the bitstream via a network or a storage medium.
- the AMVR available flag may be parsed and obtained at the SPS level, for example.
- the decoding apparatus parses and acquires the coded MVD from the bitstream (S1610).
- the coded MVD may be parsed and obtained at the PU level.
- the decoding apparatus derives a value of the representative MVD corresponding to the value of the coded MVD (S1620).
- the MVD representative value is a representative value for an MVD range including a value of an original MVD among a plurality of MVD ranges.
- the plurality of MVD ranges may be linear MVD ranges having an equivalent range
- the coded MVD value may be a value obtained by scaling up the MVD representative value to 4.
- the plurality of MVD ranges may be non-linear MVD ranges having non-uniform ranges.
- the MVD ranges located in the center region of the nonlinear MVD ranges may have a relatively wide range.
- MVD ranges corresponding to the coded MVD values ⁇ 1, 0, and 1 of the nonlinear MVD ranges may have a relatively wider range than the remaining MVD ranges.
- the coded MVD value is one of -1, 0, 1
- the MVD representative value may be a value obtained by rounding down the value of the MVD plus 4 to a multiple of 8.
- the MVD representative value may be a value obtained by scaling up the coded MVD value to 8.
- the original MVD may be a quarter pel unit MVD.
- the original MVD may be whole pel or half pel units depending on the MVD precision range.
- the decoding apparatus derives an MVP for the current block based on the spatial neighboring blocks and the temporal neighboring block (or temporal corresponding block) of the current block (S1630).
- the MVP may be an MVP in quarter quarter units.
- the MVP may be an MVP of an integer pel unit, rounded up a temporary MVP of a quarter pel unit to an integer pel unit.
- the decoding apparatus derives an MV for the current block based on the MVP and the representative MVD (S1640).
- the decoding apparatus may derive the MV for the current block by adding the MVP and the representative MVD.
- the decoding apparatus performs inter prediction based on the MV, and generates a prediction sample (or a prediction sample array) for the current block (S1650).
- the decoding apparatus may generate a prediction sample (or prediction sample array) for the current block based on a reconstruction sample (or reconstruction sample array) in a reference block at a relative position indicated by the MV on a reference picture.
- the decoding apparatus may obtain transform coefficients for the residual signal from the bitstream.
- the decoding apparatus may inverse transform the transform coefficients and obtain a residual sample (or residual sample array) for the current block from the transform coefficients.
- the decoding apparatus may generate a reconstructed sample and a reconstructed picture based on the prediction sample and the residual sample.
- the decoding apparatus may receive a nonlinear AMVR range flag indicating whether the plurality of MVD ranges have an uneven range through the bitstream.
- the value 0 of the nonlinear AMVR range flag may indicate that the plurality of MVD ranges have an equal range
- the value 1 of the nonlinear AMVR range flag may indicate that the plurality of MVD ranges have an uneven range.
- the nonlinear AMVR related parameters may include the information described above in Tables 5 and 7 above.
- the nonlinear AMVR range related parameter may include information on the size of the center three MVD ranges of the MVD ranges and representative values of the ranges.
- the nonlinear AMVR range related parameter may include information about the number of nonlinear range table candidates.
- the nonlinear AMVR range related parameter may include information about the size of the central three MVD ranges corresponding to each of the nonlinear range table candidates and representative values of the corresponding ranges.
- the decoding apparatus may derive the representative MVD value based on the nonlinear AMVR range related parameter and the coded MVD value.
- the decoding apparatus may obtain a range table index from the bitstream, and select one of the nonlinear range table candidates based on the range table index.
- the decoding apparatus may know sizes and representative values of MVD ranges based on the selected candidate, and may derive a representative MVD value corresponding to the coded MVD value based on the selected candidate.
- the representation unit of the original MVD may be adaptively changed according to the precision range.
- the decoding apparatus obtains MVD precision information indicating whether the original MVD has integer pel precision or half pel precision through the bitstream, and corresponds to the coded MVD value based on the MVD precision information.
- MVD ranges and the representative MVD values can be derived.
- the MVD precision information may include, for example, at least one of the above-described integer_pel_precision_range syntax element and half_pel_precision_range syntax element.
- the present invention described above it is possible to efficiently perform inter prediction on the current block while using little additional information.
- the amount of bits allocated to the MVD may be reduced, thereby increasing the overall coding efficiency.
- the above-described method may be implemented as a module (process, function, etc.) for performing the above-described function.
- the module may be stored in memory and executed by a processor.
- the memory may be internal or external to the processor and may be coupled to the processor by various well known means.
- the processor may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
- the memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device.
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Abstract
Description
샘플 위치 | 필터 계수 |
1/4 | {-1, 4, -10, 58, 17, -5, 1, 0} |
2/4 | {-1, 4, -11, 40, 40, -11, 4, -1} |
3/4 | {0, 1, -5, 17, 58, -10, 4, -1} |
Claims (15)
- 인코딩 장치에 의하여 수행되는 영상 인코딩 방법에 있어서,AMVR(adaptive motion vector range) 가용(enable) 플래그를 생성하는 단계;현재 블록에 대한 MVD(motion vector difference)를 도출하는 단계;다수의 MVD 범위들 중 상기 MVD의 값이 포함되는 MVD 범위에 대한 MVD 대표값을 도출하는 단계;상기 MVD 대표값에 대응하는 코딩된 MVD를 생성하는 단계; 및상기 AMVR 가용 플래그 및 상기 코딩된 MVD를 비트스트림을 통하여 출력하는 단계를 포함함을 특징으로 하는, 인코딩 방법.
- 제1항에 있어서,상기 다수의 MVD 범위들은 균등한 범위를 가지는 선형(linear) MVD 범위들이고,상기 MVD 대표값은 상기 MVD의 값 플러스 2를 4의 배수로 내림한 값이고,상기 코딩된 MVD 값은 상기 MVD 대표값을 4로 스케일 다운한 값인 것을 특징으로 하는, 인코딩 방법.
- 제1항에 있어서,상기 다수의 MVD 범위들은 비균등한 범위를 가지는 비선형(non-linear) MVD 범위들이고,상기 비선형 MVD 범위들 중 상기 코딩된 MVD 값 -1, 0, 1에 대응되는 MVD 범위들이 나머지 MVD 범위들보다 상대적으로 더 넓은 범위를 가지는 것을 특징으로 하는 인코딩 방법.
- 제1항에 있어서,상기 다수의 MVD 범위들은 비균등한 범위를 가지는 비선형(non-linear) MVD 범위들이고,상기 코딩된 MVD 값이 -1, 0, 1 중 하나인 경우,상기 MVD 대표값은 상기 MVD의 값 플러스 4를 8의 배수로 내림한 값이고,상기 코딩된 MVD 값은 상기 MVD 대표값을 8로 스케일 다운한 값인 것을 특징으로 하는, 인코딩 방법.
- 제1항에 있어서,상기 다수의 MVD 범위들이 비균등한 범위를 가지는지 여부를 나타내는 비선형 AMVR 범위 플래그를 생성하는 단계; 및상기 비선형 AMVR 범위 플래그를 상기 비트스트림을 통하여 출력하는 단계를 더 포함함을 특징으로 하는, 인코딩 방법.
- 제5항에 있어서,상기 비선형 AMVR 범위 플래그의 값이 1인 경우, 비선형 AMVR 범위 관련 파라미터를 상기 비트스트림을 통하여 출력하는 단계를 더 포함하되,상기 비선형 AMVR 범위 관련 파라미터는 상기 MVD 범위들 중 중앙 3개 MVD 범위들의 크기 및 해당 범위들의 대표값들에 관한 정보를 포함함을 특징으로 하는, 인코딩 방법.
- 제6항에 있어서,상기 비선형 AMVR 범위 관련 파라미터는 비선형 범위 테이블 후보들의 개수에 관한 정보를 포함하고,상기 비선형 AMVR 범위 관련 파라미터는 상기 비선형 범위 테이블 후보들 각각에 대응하는 중앙 3개 MVD 범위들의 크기 및 해당 범위들의 대표값들에 관한 정보를 포함함을 특징으로 하는, 인코딩 방법.
- 제7항에 있어서,상기 비선형 범위 테이블 후보들 중 하나의 후보를 가리키는 범위 테이블 인덱스를 생성하는 단계; 및상기 범위 테이블 인덱스를 상기 비트스트림을 통하여 출력하는 단계를 더 포함함을 특징으로 하는, 인코딩 방법.
- 제1항에 있어서,상기 MVD가 정수 펠 정밀도(precision) 또는 하프 펠 정밀도를 갖는지 여부를 나타내는 MVD 정밀도 정보를 생성하는 단계;상기 MVD 정밀도 정보를 상기 비트스트림을 통하여 출력하는 단계를 더 포함함을 특징으로 하는, 인코딩 방법.
- 디코딩 장치에 의하여 수행되는 인터 예측 방법에 있어서,AMVR(adaptive motion vector range) 가용(enable) 플래그를 비트스트림으로부터 획득하는 단계;코딩된 MVD(motion vector difference)를 상기 비트스트림으로부터 획득하는 단계;상기 AMVR 가용 플래그의 값이 1인 경우, 상기 코딩된 MVD의 값에 대응하는 대표 MVD의 값을 도출하는 단계;현재 블록의 주변 블록을 기반으로 상기 현재 블록에 대한 움직임 벡터 예측자(motion vector predictor, MVP)를 도출하는 단계;상기 MVP 및 상기 대표 MVD를 기반으로 상기 현재 블록에 대한 움직임 벡터(motion vector, MV)를 도출하는 단계; 및상기 MV를 기반으로 상기 현재 블록에 대한 예측 샘플을 생성하는 단계를 포함함을 특징으로 하는, 인터 예측 방법.
- 제10항에 있어서,상기 MVD 대표값은 다수의 MVD 범위들 중 원본(original) MVD의 값이 포함되는 MVD 범위에 대한 대표값인 것을 특징으로 하는, 인터 예측 방법.
- 제11항에 있어서,상기 다수의 MVD 범위들은 균등한 범위를 가지는 선형(linear) MVD 범위들이고,상기 코딩된 MVD 값은 상기 MVD 대표값을 4로 스케일 업한 값인 것을 특징으로 하는, 인터 예측 방법.
- 제11항에 있어서,상기 다수의 MVD 범위들은 비균등한 범위를 가지는 비선형(non-linear) MVD 범위들이고,상기 비선형 MVD 범위들 중 상기 코딩된 MVD 값 -1, 0, 1에 대응되는 MVD 범위들이 나머지 MVD 범위들보다 상대적으로 더 넓은 범위를 가지는 것을 특징으로 하는, 인터 예측 방법.
- 제11항에 있어서,상기 다수의 MVD 범위들이 비균등한 범위를 가지는지 여부를 나타내는 비선형 AMVR 범위 플래그를 상기 비트스트림으로부터 획득하는 단계; 및상기 비선형 AMVR 범위 플래그의 값이 1인 경우, 비선형 AMVR 범위 관련 파라미터를 상기 비트스트림으로부터 획득하는 단계를 더 포함하되,상기 대표 MVD 값은 상기 비선형 AMVR 범위 관련 파라미터 및 상기 코딩된 MVD 값을 기반으로 도출됨을 특징으로 하는, 인터 예측 방법.
- 제14항에 있어서,범위 테이블 인덱스를 상기 비트스트림을 통하여 획득하는 단계를 더 포함하되,상기 비선형 AMVR 범위 관련 파라미터는 비선형 범위 테이블 후보들의 개수에 관한 정보를 포함하고,상기 비선형 AMVR 범위 관련 파라미터는 상기 비선형 범위 테이블 후보들 각각에 대응하는 중앙 3개 MVD 범위들의 크기 및 해당 범위들의 대표값들에 관한 정보를 포함하고,상기 범위 테이블 인덱스는 상기 비선형 범위 테이블 후보들 중 하나의 후보를 가리키는 것을 특징으로 하는, 인터 예측 방법.
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2016
- 2016-03-03 JP JP2018515808A patent/JP2018533298A/ja active Pending
- 2016-03-03 EP EP16848735.3A patent/EP3355582B1/en active Active
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- 2016-03-03 WO PCT/KR2016/002161 patent/WO2017052009A1/ko active Application Filing
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CN112385230A (zh) * | 2018-07-02 | 2021-02-19 | Lg电子株式会社 | 通过使用仿射预测处理视频信号的方法和设备 |
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US11115652B2 (en) | 2018-12-07 | 2021-09-07 | Tencent America LLC | Method and apparatus for further improved context design for prediction mode and coded block flag (CBF) |
US11533473B2 (en) | 2018-12-07 | 2022-12-20 | Tencent America LLC | Method and apparatus for further improved context design for prediction mode and coded block flag (CBF) |
JP2022521157A (ja) * | 2019-02-28 | 2022-04-06 | テンセント・アメリカ・エルエルシー | 映像復号のための方法、装置、及びコンピュータプログラム |
JP7125563B2 (ja) | 2019-02-28 | 2022-08-24 | テンセント・アメリカ・エルエルシー | 映像復号のための方法、装置、及びコンピュータプログラム |
US11418794B2 (en) | 2019-04-25 | 2022-08-16 | Beijing Bytedance Network Technology Co., Ltd. | Restrictions on motion vector difference |
US11909982B2 (en) | 2019-04-25 | 2024-02-20 | Beijing Bytedance Network Technology Co., Ltd. | Restrictions on motion vector difference |
US11812028B2 (en) | 2019-06-25 | 2023-11-07 | Beijing Bytedance Network Technology Co., Ltd. | Restrictions on motion vector difference |
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US10547847B2 (en) | 2020-01-28 |
EP3355582B1 (en) | 2021-04-28 |
EP3355582A1 (en) | 2018-08-01 |
CN108353176A (zh) | 2018-07-31 |
CN108353176B (zh) | 2022-05-03 |
KR20180059444A (ko) | 2018-06-04 |
US20180270485A1 (en) | 2018-09-20 |
EP3355582A4 (en) | 2019-04-17 |
JP2018533298A (ja) | 2018-11-08 |
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