WO2016153146A1 - 인트라 예측 모드 기반 영상 처리 방법 및 이를 위한 장치 - Google Patents
인트라 예측 모드 기반 영상 처리 방법 및 이를 위한 장치 Download PDFInfo
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- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/103—Selection of coding mode or of prediction mode
- H04N19/11—Selection of coding mode or of prediction mode among a plurality of spatial predictive coding modes
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- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
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- H04N19/157—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
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Definitions
- the present invention relates to a still image or moving image processing method, and more particularly, to a method for encoding / decoding a still image or moving image based on an intra prediction mode and an apparatus supporting the same.
- Compression coding refers to a series of signal processing techniques for transmitting digitized information through a communication line or for storing in a form suitable for a storage medium.
- Media such as an image, an image, an audio, and the like may be a target of compression encoding.
- a technique of performing compression encoding on an image is called video image compression.
- Next-generation video content will be characterized by high spatial resolution, high frame rate and high dimensionality of scene representation. Processing such content would result in a tremendous increase in terms of memory storage, memory access rate, and processing power.
- block-based image compression technology compresses the image by dividing the image into a fixed shape in a square, so that the characteristics of the image are appropriately
- the prediction accuracy decreases as the distance from the reference sample increases.
- an object of the present invention is to propose a method for segmenting an image based on the direction of an intra prediction mode.
- an object of the present invention is to propose a method of performing encoding / decoding on a divided block based on a direction of an intra prediction mode.
- An aspect of the present invention provides a method of processing an image based on an intra prediction mode, comprising: dividing the processing block based on an intra prediction mode of a processing block and intra targeting the split processing block. And performing prediction, wherein the division direction of the divided processing block is perpendicular to the prediction direction of the intra prediction mode of the processing block.
- An aspect of the present invention is an apparatus for processing an image based on an intra prediction mode, comprising: a splitter for dividing the processing block based on an intra prediction mode of a processing block and a target of the divided processing block; And an intra prediction processor configured to perform intra prediction, wherein the division direction of the divided processing block may be perpendicular to the prediction direction of the intra prediction mode of the processing block.
- the processing block may be divided.
- the processing block may be determined whether the processing block is divided in a quadrangle quadrature or perpendicular to the prediction direction.
- the processing block when the intra prediction mode of the processing block is an intra planar or intra DC, the processing block is partitioned in a quadrangle quadrangle manner, otherwise, the processing block is It can be split perpendicular to the prediction direction.
- the method may further include reconstructing the divided processing block into a square block and performing transform / inverse transform on the reconstructed processing block.
- the divided processing block is 2N ⁇ N / 2
- the divided processing block is divided into two blocks having a half horizontal size, and the two blocks are rearranged in the vertical direction to form an N ⁇ N square.
- the block can be reconstructed.
- the divided processing block is N / 2 x 2N
- the divided processing block is divided into two blocks having a half vertical size, and the two blocks are rearranged in a horizontal direction so that the N x N square The block can be reconstructed.
- the square blocks may be reconstructed by rearranging the samples included in the divided processing blocks in a predetermined order.
- the method may further include constructing a reference sample for the divided processing block.
- the reference sample is a sample adjacent to a left boundary of the divided processing block, on a top boundary of the divided processing block. It may consist of an adjacent sample and a sample neighboring the top-left of the divided processing block.
- the reference sample is a sample adjacent to a left boundary of the divided processing block, a sample adjacent to a top boundary of the divided processing block and the It may consist of samples neighboring the top-left of the divided processing block.
- the reference sample is a sample adjacent to a top-left boundary, a sample adjacent to a right boundary, and a bottom of the divided processing block. It may consist of samples adjacent to the boundary.
- the prediction accuracy may be increased by reducing the distance between the reference sample and the prediction sample when applying the intra prediction.
- the transform / inverse transform may be performed using a previously defined transform / inverse transform technique.
- FIG. 1 is a schematic block diagram of an encoder in which encoding of a still image or video signal is performed according to an embodiment to which the present invention is applied.
- FIG. 2 is a schematic block diagram of a decoder in which encoding of a still image or video signal is performed according to an embodiment to which the present invention is applied.
- FIG. 3 is a diagram for describing a partition structure of a coding unit that may be applied to the present invention.
- FIG. 4 is a diagram for explaining a prediction unit applicable to the present invention.
- FIG. 5 is a diagram illustrating an intra prediction method as an embodiment to which the present invention is applied.
- FIG. 6 illustrates a prediction direction according to an intra prediction mode.
- FIG. 7 and 8 are diagrams for explaining a problem in conventional intra mode prediction.
- FIG. 9 illustrates an intra prediction mode based partitioning method according to an embodiment of the present invention.
- FIG. 10 illustrates a method of constructing a reference sample for an intra prediction mode based partitioned block according to an embodiment of the present invention.
- FIG. 11 is a diagram for comparing and comparing an existing block division scheme and an intra prediction mode based block division scheme according to the present invention.
- FIG. 12 is a diagram more specifically illustrating an intra predictor according to an embodiment of the present invention.
- FIG. 13 and 14 illustrate an intra prediction mode based video signal processing method according to an embodiment of the present invention.
- FIG. 15 is a diagram for describing a method of relocating (or reconfiguring) a transform unit according to an exemplary embodiment.
- FIG. 16 is a diagram for explaining a conventional transform block partitioning method and a transform block reconstruction method according to the present invention.
- 17 is a view for explaining a method of relocating (or reconfiguring) a transform unit according to an embodiment of the present invention.
- FIG. 18 is a diagram for describing a method of relocating (or reconfiguring) a transform unit according to an embodiment of the present invention.
- FIG. 19 is a diagram more specifically illustrating a transform unit / inverse transform unit according to an embodiment of the present invention.
- 20 is a diagram illustrating an intra prediction mode based image signal processing method according to an embodiment of the present invention.
- the 'processing unit' refers to a unit in which a process of encoding / decoding such as prediction, transformation, and / or quantization is performed.
- the processing unit may be referred to as a 'processing block' or 'block'.
- the processing unit may be interpreted to include a unit for the luma component and a unit for the chroma component.
- the processing unit may correspond to a Coding Tree Unit (CTU), a Coding Unit (CU), a Prediction Unit (PU), or a Transform Unit (TU).
- CTU Coding Tree Unit
- CU Coding Unit
- PU Prediction Unit
- TU Transform Unit
- the processing unit may be interpreted as a unit for a luma component or a unit for a chroma component.
- the processing unit may be a coding tree block (CTB), a coding block (CB), a prediction block (PU), or a transform block (TB) for a luma component. May correspond to. Or, it may correspond to a coding tree block (CTB), a coding block (CB), a prediction block (PU), or a transform block (TB) for a chroma component.
- CTB coding tree block
- CB coding block
- PU prediction block
- TB transform block
- the present invention is not limited thereto, and the processing unit may be interpreted to include a unit for a luma component and a unit for a chroma component.
- processing unit is not necessarily limited to square blocks, but may also be configured in a polygonal form having three or more vertices.
- a pixel, a pixel, and the like are referred to collectively as samples.
- using a sample may mean using a pixel value or a pixel value.
- FIG. 1 is a schematic block diagram of an encoder in which encoding of a still image or video signal is performed according to an embodiment to which the present invention is applied.
- the encoder 100 may include an image divider 110, a subtractor 115, a transform unit 120, a quantizer 130, an inverse quantizer 140, an inverse transform unit 150, and a filtering unit. 160, a decoded picture buffer (DPB) 170, a predictor 180, and an entropy encoder 190.
- the predictor 180 may include an inter predictor 181 and an intra predictor 182.
- the image divider 110 divides an input video signal (or a picture or a frame) input to the encoder 100 into one or more processing units.
- the subtractor 115 subtracts the difference from the prediction signal (or prediction block) output from the prediction unit 180 (that is, the inter prediction unit 181 or the intra prediction unit 182) in the input image signal. Generate a residual signal (or difference block). The generated difference signal (or difference block) is transmitted to the converter 120.
- the transform unit 120 may convert a differential signal (or a differential block) into a transform scheme (eg, a discrete cosine transform (DCT), a discrete sine transform (DST), a graph-based transform (GBT), and a karhunen-loeve transform (KLT)). Etc.) to generate transform coefficients.
- a transform scheme eg, a discrete cosine transform (DCT), a discrete sine transform (DST), a graph-based transform (GBT), and a karhunen-loeve transform (KLT)
- the transform unit 120 may perform the transformation by reconstructing the processing block into a square block. A more detailed description of the converter 120 will be described later.
- the quantization unit 130 quantizes the transform coefficients and transmits the transform coefficients to the entropy encoding unit 190, and the entropy encoding unit 190 entropy codes the quantized signals and outputs them as bit streams.
- the quantized signal output from the quantization unit 130 may be used to generate a prediction signal.
- the quantized signal may recover the differential signal by applying inverse quantization and inverse transformation through an inverse quantization unit 140 and an inverse transformation unit 150 in a loop.
- a reconstructed signal may be generated by adding the reconstructed difference signal to a prediction signal output from the inter predictor 181 or the intra predictor 182.
- the filtering unit 160 applies filtering to the reconstruction signal and outputs it to the reproduction apparatus or transmits the decoded picture buffer to the decoding picture buffer 170.
- the filtered signal transmitted to the decoded picture buffer 170 may be used as the reference picture in the inter prediction unit 181. As such, by using the filtered picture as a reference picture in the inter prediction mode, not only image quality but also encoding efficiency may be improved.
- the decoded picture buffer 170 may store the filtered picture for use as a reference picture in the inter prediction unit 181.
- the inter prediction unit 181 performs temporal prediction and / or spatial prediction to remove temporal redundancy and / or spatial redundancy with reference to a reconstructed picture.
- the reference picture used to perform the prediction is a transformed signal that has been quantized and dequantized in units of blocks at the time of encoding / decoding in the previous time, blocking artifacts or ringing artifacts may exist. have.
- the inter prediction unit 181 may interpolate the signals between pixels in sub-pixel units by applying a lowpass filter to solve performance degradation due to discontinuity or quantization of such signals.
- the subpixel refers to a virtual pixel generated by applying an interpolation filter
- the integer pixel refers to an actual pixel existing in the reconstructed picture.
- the interpolation method linear interpolation, bi-linear interpolation, wiener filter, or the like may be applied.
- the interpolation filter may be applied to a reconstructed picture to improve the precision of prediction.
- the inter prediction unit 181 generates an interpolation pixel by applying an interpolation filter to integer pixels, and uses an interpolated block composed of interpolated pixels as a prediction block. You can make predictions.
- the intra predictor 182 predicts the current block by referring to samples in the vicinity of the block to which the current encoding is to be performed.
- the intra prediction unit 182 may perform the following process to perform intra prediction. First, reference samples necessary for generating a prediction signal may be prepared. The prediction signal may be generated using the prepared reference sample. Then, the prediction mode is encoded. In this case, the reference sample may be prepared through reference sample padding and / or reference sample filtering. Since the reference sample has been predicted and reconstructed, there may be a quantization error. Accordingly, the reference sample filtering process may be performed for each prediction mode used for intra prediction to reduce such an error.
- the intra prediction unit 182 may divide a processing block according to a division direction determined based on an intra prediction mode, and perform intra prediction on the divided processing block. A detailed description of the intra predictor 182 will be described later.
- the prediction signal (or prediction block) generated by the inter prediction unit 181 or the intra prediction unit 182 is used to generate a reconstruction signal (or reconstruction block) or a differential signal (or differential block). It can be used to generate.
- FIG. 2 is a schematic block diagram of a decoder in which encoding of a still image or video signal is performed according to an embodiment to which the present invention is applied.
- the decoder 200 includes an entropy decoding unit 210, an inverse quantization unit 220, an inverse transform unit 230, an adder 235, a filtering unit 240, and a decoded picture buffer (DPB).
- Buffer Unit (250) the prediction unit 260 may be configured.
- the predictor 260 may include an inter predictor 261 and an intra predictor 262.
- the reconstructed video signal output through the decoder 200 may be reproduced through the reproducing apparatus.
- the decoder 200 receives a signal (ie, a bit stream) output from the encoder 100 of FIG. 1, and the received signal is entropy decoded through the entropy decoding unit 210.
- the inverse quantization unit 220 obtains a transform coefficient from the entropy decoded signal using the quantization step size information.
- the inverse transform unit 230 applies an inverse transform scheme to inverse transform the transform coefficients to obtain a residual signal (or a differential block).
- the inverse transform unit 230 may perform inverse transformation by reconfiguring the processing block into a square block.
- the inverse transform unit 230 will be described in detail later.
- the adder 235 outputs the obtained difference signal (or difference block) from the prediction unit 260 (that is, the prediction signal (or prediction block) output from the inter prediction unit 261 or the intra prediction unit 262. ) Generates a reconstructed signal (or a reconstruction block).
- the filtering unit 240 applies filtering to the reconstructed signal (or the reconstructed block) and outputs the filtering to the reproduction device or transmits the decoded picture buffer unit 250 to the reproduction device.
- the filtered signal transmitted to the decoded picture buffer unit 250 may be used as a reference picture in the inter predictor 261.
- the embodiments described by the filtering unit 160, the inter prediction unit 181, and the intra prediction unit 182 of the encoder 100 are respectively the filtering unit 240, the inter prediction unit 261, and the decoder of the decoder. The same may be applied to the intra predictor 262.
- the intra prediction unit 262 may divide a processing block according to a division direction determined based on an intra prediction mode, and perform intra prediction on the divided processing block. A detailed description of the intra predictor 262 will be described later.
- a still image or video compression technique uses a block-based image compression method.
- the block-based image compression method is a method of processing an image by dividing the image into specific block units, and may reduce memory usage and calculation amount.
- FIG. 3 is a diagram for describing a partition structure of a coding unit that may be applied to the present invention.
- the encoder splits one image (or picture) into units of a coding tree unit (CTU) in a rectangular shape.
- CTU coding tree unit
- one CTU is sequentially encoded according to a raster scan order.
- the size of the CTU may be set to any one of 64 ⁇ 64, 32 ⁇ 32, and 16 ⁇ 16.
- the encoder may select and use the size of the CTU according to the resolution of the input video or the characteristics of the input video.
- the CTU includes a coding tree block (CTB) for luma components and a CTB for two chroma components corresponding thereto.
- CTB coding tree block
- One CTU may be divided into a quad-tree structure. That is, one CTU has a square shape and is divided into four units having a half horizontal size and a half vertical size to generate a coding unit (CU). have. This partitioning of the quad-tree structure can be performed recursively. That is, a CU is hierarchically divided into quad-tree structures from one CTU.
- CU coding unit
- the CU refers to a basic unit of coding in which an input image is processed, for example, intra / inter prediction is performed.
- the CU includes a coding block (CB) for a luma component and a CB for two chroma components corresponding thereto.
- CB coding block
- the size of a CU may be set to any one of 64 ⁇ 64, 32 ⁇ 32, 16 ⁇ 16, and 8 ⁇ 8.
- the root node of the quad-tree is associated with the CTU.
- the quad-tree is split until it reaches a leaf node, which corresponds to a CU.
- the CTU may not be divided according to the characteristics of the input image.
- the CTU corresponds to a CU.
- a node that is no longer divided ie, a leaf node
- CU a node that is no longer divided
- CU a node that is no longer divided
- CU a node corresponding to nodes a, b, and j are divided once in the CTU and have a depth of one.
- a node (ie, a leaf node) that is no longer divided in a lower node having a depth of 2 corresponds to a CU.
- CU (c), CU (h) and CU (i) corresponding to nodes c, h and i are divided twice in the CTU and have a depth of two.
- a node that is no longer partitioned (ie, a leaf node) in a lower node having a depth of 3 corresponds to a CU.
- CU (d), CU (e), CU (f), and CU (g) corresponding to nodes d, e, f, and g are divided three times in the CTU, Has depth.
- the maximum size or the minimum size of the CU may be determined according to characteristics (eg, resolution) of the video image or in consideration of encoding efficiency. Information about this or information capable of deriving the information may be included in the bitstream.
- a CU having a maximum size may be referred to as a largest coding unit (LCU), and a CU having a minimum size may be referred to as a smallest coding unit (SCU).
- LCU largest coding unit
- SCU smallest coding unit
- a CU having a tree structure may be hierarchically divided with predetermined maximum depth information (or maximum level information).
- Each partitioned CU may have depth information. Since the depth information indicates the number and / or degree of division of the CU, the depth information may include information about the size of the CU.
- the size of the SCU can be obtained by using the size and maximum depth information of the LCU. Or conversely, using the size of the SCU and the maximum depth information of the tree, the size of the LCU can be obtained.
- information indicating whether the corresponding CU is split may be transmitted to the decoder.
- This partitioning information is included in all CUs except the SCU. For example, if the flag indicating whether to split or not is '1', the CU is divided into 4 CUs again. If the flag indicating whether to split or not is '0', the CU is not divided further. Processing may be performed.
- a CU is a basic unit of coding in which intra prediction or inter prediction is performed.
- HEVC divides a CU into prediction units (PUs) in order to code an input image more effectively.
- the PU is a basic unit for generating a prediction block, and may generate different prediction blocks in PU units within one CU. However, PUs belonging to one CU are not mixed with intra prediction and inter prediction, and PUs belonging to one CU are coded by the same prediction method (ie, intra prediction or inter prediction).
- the PU is not divided into quad-tree structures, but is divided once in a predetermined form in one CU. This will be described with reference to the drawings below.
- FIG. 4 is a diagram for explaining a prediction unit applicable to the present invention.
- the PU is divided differently according to whether an intra prediction mode or an inter prediction mode is used as a coding mode of a CU to which the PU belongs.
- FIG. 4A illustrates a PU when an intra prediction mode is used
- FIG. 4B illustrates a PU when an inter prediction mode is used.
- N ⁇ N type PU when divided into N ⁇ N type PU, one CU is divided into four PUs, and different prediction blocks are generated for each PU unit.
- the division of the PU may be performed only when the size of the CB for the luminance component of the CU is the minimum size (that is, the CU is the SCU).
- one CU has 8 PU types (ie, 2N ⁇ 2N). , N ⁇ N, 2N ⁇ N, N ⁇ 2N, nL ⁇ 2N, nR ⁇ 2N, 2N ⁇ nU, 2N ⁇ nD).
- PU partitioning in the form of N ⁇ N may be performed only when the size of the CB for the luminance component of the CU is the minimum size (that is, the CU is the SCU).
- AMP Asymmetric Motion Partition
- 'n' means a 1/4 value of 2N.
- AMP cannot be used when the CU to which the PU belongs is a CU of the minimum size.
- an optimal partitioning structure of a coding unit (CU), a prediction unit (PU), and a transformation unit (TU) is subjected to the following process to perform a minimum rate-distortion. It can be determined based on the value. For example, looking at the optimal CU partitioning process in 64 ⁇ 64 CTU, rate-distortion cost can be calculated while partitioning from a 64 ⁇ 64 CU to an 8 ⁇ 8 CU.
- the specific process is as follows.
- the partition structure of the optimal PU and TU that generates the minimum rate-distortion value is determined by performing inter / intra prediction, transform / quantization, inverse quantization / inverse transform, and entropy encoding for a 64 ⁇ 64 CU.
- the 32 ⁇ 32 CU is subdivided into four 16 ⁇ 16 CUs, and a partition structure of an optimal PU and TU that generates a minimum rate-distortion value for each 16 ⁇ 16 CU is determined.
- 16 ⁇ 16 blocks by comparing the sum of the rate-distortion values of the 16 ⁇ 16 CUs calculated in 3) above with the rate-distortion values of the four 8 ⁇ 8 CUs calculated in 4) above. Determine the partition structure of the optimal CU within. This process is similarly performed for the remaining three 16 ⁇ 16 CUs.
- a prediction mode is selected in units of PUs, and prediction and reconstruction are performed in units of actual TUs for the selected prediction mode.
- the TU means a basic unit in which actual prediction and reconstruction are performed.
- the TU includes a transform block (TB) for a luma component and a TB for two chroma components corresponding thereto.
- TB transform block
- the TUs are hierarchically divided into quad-tree structures from one CU to be coded.
- the TU divided from the CU can be further divided into smaller lower TUs.
- the size of the TU may be set to any one of 32 ⁇ 32, 16 ⁇ 16, 8 ⁇ 8, and 4 ⁇ 4.
- a root node of the quad-tree is associated with a CU.
- the quad-tree is split until it reaches a leaf node, which corresponds to a TU.
- the CU may not be divided according to the characteristics of the input image.
- the CU corresponds to a TU.
- a node ie, a leaf node
- TU (a), TU (b), and TU (j) corresponding to nodes a, b, and j are divided once in a CU and have a depth of 1.
- FIG. 3B TU (a), TU (b), and TU (j) corresponding to nodes a, b, and j are divided once in a CU and have a depth of 1.
- a node (ie, a leaf node) that is no longer divided in a lower node having a depth of 2 corresponds to a TU.
- TU (c), TU (h), and TU (i) corresponding to nodes c, h, and i are divided twice in a CU and have a depth of two.
- a node that is no longer partitioned (ie, a leaf node) in a lower node having a depth of 3 corresponds to a CU.
- TU (d), TU (e), TU (f), and TU (g) corresponding to nodes d, e, f, and g are divided three times in a CU. Has depth.
- a TU having a tree structure may be hierarchically divided with predetermined maximum depth information (or maximum level information). Each divided TU may have depth information. Since the depth information indicates the number and / or degree of division of the TU, it may include information about the size of the TU.
- information indicating whether the corresponding TU is split may be delivered to the decoder.
- This partitioning information is included in all TUs except the smallest TU. For example, if the value of the flag indicating whether to split is '1', the corresponding TU is divided into four TUs again. If the value of the flag indicating whether to split is '0', the corresponding TU is no longer divided.
- FIG. 5 is a diagram illustrating an intra prediction method as an embodiment to which the present invention is applied.
- the decoder derives the intra prediction mode of the current processing block (S501).
- the prediction direction may have a prediction direction with respect to the position of the reference sample used for the prediction according to the prediction mode.
- An intra prediction mode having a prediction direction is referred to as an intra directional prediction mode.
- an intra prediction mode having no prediction direction there are an intra planner (INTRA_PLANAR) prediction mode and an intra DC (INTRA_DC) prediction mode.
- Table 1 illustrates an intra prediction mode and related names
- FIG. 6 illustrates a prediction direction according to the intra prediction mode.
- Intra prediction performs prediction on the current processing block based on the derived prediction mode. Since the reference sample used for prediction and the specific prediction method vary according to the prediction mode, when the current block is encoded in the intra prediction mode, the decoder derives the prediction mode of the current block to perform the prediction.
- the decoder checks whether neighboring samples of the current processing block can be used for prediction and constructs reference samples to be used for prediction (S502).
- the neighboring samples of the current processing block are the samples adjacent to the left boundary of the current processing block of size nS ⁇ nS and the total 2 ⁇ nS samples neighboring the bottom-left, It means a total of 2 x nS samples adjacent to the top border and a sample adjacent to the top-right and one sample neighboring the top-left of the current processing block.
- the decoder can construct reference samples for use in prediction by substituting samples that are not available with the available samples.
- the decoder may perform filtering of the reference sample based on the intra prediction mode (S503).
- Whether filtering of the reference sample is performed may be determined based on the size of the current processing block.
- the filtering method of the reference sample may be determined by the filtering flag transmitted from the encoder.
- the decoder generates a prediction block for the current processing block based on the intra prediction mode and the reference samples (S504). That is, the decoder predicts the current processing block based on the intra prediction mode derived in the intra prediction mode derivation step S501 and the reference samples obtained through the reference sample configuration step S502 and the reference sample filtering step S503. Generate a block (ie, generate a predictive sample).
- the left boundary sample ie, the sample in the prediction block adjacent to the left boundary
- the upper side of the prediction block in step S504.
- (top) boundary samples i.e., samples in prediction blocks adjacent to the upper boundary
- filtering may be applied to the left boundary sample or the upper boundary sample in the vertical direction mode and the horizontal mode among the intra directional prediction modes similarly to the INTRA_DC mode.
- the value of the prediction sample may be derived based on a reference sample located in the prediction direction.
- a boundary sample which is not located in the prediction direction among the left boundary sample or the upper boundary sample of the prediction block may be adjacent to a reference sample which is not used for prediction. That is, the distance from the reference sample not used for prediction may be much closer than the distance from the reference sample used for prediction.
- the decoder may adaptively apply filtering to left boundary samples or upper boundary samples depending on whether the intra prediction direction is vertical or horizontal. That is, when the intra prediction direction is the vertical direction, the filtering may be applied to the left boundary samples, and when the intra prediction direction is the horizontal direction, the filtering may be applied to the upper boundary samples.
- FIG. 7 is a diagram for explaining a problem in conventional intra mode prediction.
- a 4 ⁇ 4 TU is encoded in a vertical intra prediction mode in a vertical direction, and an arrow indicates a prediction direction.
- a predicted sample value is derived using a reference sample located in the vertical direction.
- the prediction sample 702 located at the top boundary in the TU has high prediction accuracy because it is close to the reference sample 701, but the prediction sample 703 located at the bottom boundary in the TU is referred to.
- the prediction accuracy is low because the distance from the sample 701 is far.
- FIG. 8 is a diagram for explaining a problem in conventional intra mode prediction.
- the CU In intra prediction encoding of HEVC, as shown in FIG. 8, the CU is divided into TUs in a square shape, and actual prediction and reconstruction is performed on each divided square TU. Therefore, as shown in Figure 4, when the size of the PU is 2N ⁇ 2N and the TU depth is 1, the lower right side of the TU for the intra prediction mode in all directions as well as the intra prediction mode in the vertical direction and the intra prediction mode in the horizontal direction, respectively In the case of the sample 802, the prediction accuracy is lowered by the distance N between the reference sample 801 and the prediction sample.
- the present invention proposes a method for increasing the accuracy of intra prediction by minimizing the distance between the reference sample and the prediction sample in intra prediction.
- the present invention proposes a method of performing intra prediction by dividing a processing unit into various forms based on each intra prediction mode.
- the processing unit may be divided in a form orthogonal to the prediction direction of each intra prediction mode.
- a unit for performing intra prediction and transformation is a transform unit (TU) (or transform block), and the transform unit is a coding unit (CU) (or coding block).
- the unit of which the intra prediction mode is divided and is determined is assumed on the assumption of a prediction unit (PU) (or prediction block), but this is merely an example and the present invention is not limited thereto.
- the transform unit / coding unit / prediction unit may be replaced by a processing unit (or a processing block) or the like having any size or shape.
- FIG. 9 illustrates an intra prediction mode based partitioning method according to an embodiment of the present invention.
- FIG. 9 a 2N ⁇ 2N size PU (ie, same as a CU) and a TU having a depth of 1 are illustrated.
- FIG. 9 (a) illustrates a method of partitioning a TU in an intra prediction mode in a vertical direction
- FIG. 9 (b) illustrates a method of partitioning a TU in an intra prediction mode in a horizontal direction
- FIG. 9 (c) shows a lower right side.
- a division method of a TU in the intra prediction mode of the direction ie, 135 °
- a coding sequence of a TU is performed as TU_0, TU_1, TU_2, and TU_3, and after one TU is encoded and decoded, it is used as a reference sample for encoding the next TU.
- the TU may be split in the horizontal direction from the CU. As such, by dividing the TU in a direction perpendicular to the direction of the intra prediction mode and performing prediction, the distance between the reference sample 901a and the far right lower prediction sample 902a at TU_0 may be reduced to N / 2. .
- TU_1 when TU_0 is encoded and decoded and used as a reference pixel, the distance between the reference sample and the right lowermost prediction sample in TU_1 may be reduced to N / 2.
- the same method can be used for TU_2 and TU_3 to reduce the distance between the reference sample and the farthest prediction sample to N / 2.
- the TU may be split from the CU in the vertical direction. As such, by dividing the TU in a direction perpendicular to the direction of the intra prediction mode and performing prediction, the distance between the reference sample 901b and the far right lower prediction sample 902b at TU_0 may be reduced to N / 2. .
- TU_1 when TU0 is encoded and decoded and used as a reference pixel, the distance between the reference sample and the right lowermost prediction sample in TU_1 may be reduced to N / 2.
- the same method can be used for TU_2 and TU_3 to reduce the distance between the reference sample and the farthest prediction sample to N / 2.
- the TU may be split from the CU in the 45 ° direction. As such, by dividing the TU in a direction perpendicular to the direction of the intra prediction mode and performing prediction, the distance between the reference sample 901c and the far right lower prediction sample 902c farthest from TU_0 may be reduced.
- TU_1 when TU_0 is encoded and decoded and used as a reference pixel, the distance between the reference sample and the right lowermost prediction sample in TU_1 may be reduced to N / 2.
- the same method can be used for TU_2 and TU_3 to reduce the distance between the reference sample and the farthest prediction sample to N / 2.
- the TU is split from the CU in a direction orthogonal to the prediction direction of the intra prediction mode, but may be split in a quad-tree similarly to the conventional method. That is, one CU may be divided into four TUs of depth one.
- a TU having a depth of 1 is illustrated for convenience of description, but the present invention is not limited thereto. That is, the TU may be divided by applying the same method as the example of FIG. 9 to the TU having a depth of 2 or more.
- the TU of depth 2 may be divided from each TU of depth 1 in the intra prediction mode in the vertical direction, so that each TU of depth 2 has a vertical height. All may be N / 8. That is, the division scheme may be equally applied to a method in which a TU having a depth of 1 is divided from a CU.
- each of the TUs of the same depth divided from one CU may be divided so that the area is the same.
- each of the TUs of the same depth divided from one CU may be divided to include the same number of samples.
- TU 0, TU 1, TU 2, and TU 3 may all be divided to have the same area or to include the same number of samples.
- the TU may be divided in a direction perpendicular to the intra prediction direction with respect to various intra prediction directions.
- intra prediction uses a total of 35 prediction modes, and when the present invention is applied to 33 prediction modes having bidirectionality, 33 kinds of intra prediction modes are used according to directions according to 33 intra prediction modes.
- the division direction (eg, perpendicular to the intra prediction direction) of the TU of may be determined.
- FIG. 10 illustrates a method of constructing a reference sample for an intra prediction mode based partitioned block according to an embodiment of the present invention.
- FIG. 10 illustrates only reference samples for TU 0 and TU 2 for each intra prediction mode for convenience of description, but reference samples for TU 1 and TU 3 may be configured in the same manner.
- FIG. 10 (a) illustrates a reference sample for a TU split in the horizontal direction according to the intra prediction mode in the vertical direction
- FIG. 10 (b) illustrates a TU split in the vertical direction according to the intra prediction mode in the horizontal direction
- 10C illustrates a reference sample for a TU divided in a 45 ° direction according to an intra prediction mode in the 135 ° direction (eg, INTRA_ANGULAR18 in the example of FIG. 6 above).
- reference samples 1001a and 1002a for TUs divided in the horizontal direction are left boundaries of the TUs for each TU (TU 1, TU 2, TU 3, and TU 4). It may consist of a sample adjacent to, a sample adjacent to the top boundary of the TU, and a sample neighboring the top-left of the TU.
- the number of reference samples may be determined based on the size of the TU and / or the partition type of the TU.
- the total number of reference samples 1001a and 1002a of the TU is divided by a conventional quad-tree method. And a different number from the TU having the same depth. That is, in the case of an N ⁇ N-sized TU divided into square quad-trees, the reference samples 1001a and 1002a consist of 4N + 1 in total, whereas 2N ⁇ N as shown in FIG.
- the top-left (N-top) sample can be composed of a total of (3N) + (N / 2) + one.
- the reference samples 1001a and 1002a are samples adjacent to the left boundary of the TU and bottom-left.
- the number of samples neighboring to is N
- the number of samples adjacent to the top boundary of the TU and the number of samples neighboring to the top-right are (2N) + (N / 2)
- the top left may be configured as a total of (3N) + (N / 2) +1.
- reference samples 1001b and 1002b for TUs divided in the vertical direction are left boundaries of the TUs for each TU (TU 1, TU 2, TU 3, and TU 4). It may consist of a sample adjacent to, a sample adjacent to the top boundary of the TU, and a sample neighboring the top-left of the TU.
- the number of reference samples may be determined based on the size of the TU and / or the partition type of the TU.
- the total number of reference samples 1001b and 1002b of the TU is divided by a quad-tree method of square and the same. It may be configured with a different number from the TU having a depth. That is, in the case of an N ⁇ N-sized TU divided into square quad-trees, reference samples 1001b and 1002b are composed of 4N + 1 in total, whereas N / 2 as shown in FIG. 10 (b).
- 3N samples adjacent to the left boundary and bottom-left neighbors of the corresponding TU of the TU, 3N samples adjacent to the top boundary, and right upper side N ⁇ 2 samples that are adjacent to (top-right) may be configured as a total of (3N) + (N / 2) +1 which is one sample that is adjacent to the top-left.
- the reference samples 1001b and 1002b are samples adjacent to the left boundary of the TU and bottom-left.
- the number of samples neighboring to is (2N) + (N / 2)
- the number of samples adjacent to the top boundary of the TU and the number of samples neighboring to the top-right are N and the upper left (
- One number of samples neighboring the top-left) may be configured as a total of (3N) + (N / 2) +1.
- a reference sample for a TU divided in a 45 ° direction may include neighboring samples adjacent to a boundary of the corresponding TU for each TU.
- the reference sample 1001c is a sample adjacent to the left boundary of the TU, a sample adjacent to the top boundary, and samples neighboring to the top-left. Can be configured.
- the reference sample 1002c is a sample adjacent to the top-left boundary, the sample adjacent to the right boundary, and the sample adjacent to the bottom boundary of the TU. Can be configured.
- FIG. 10 (c) only the TU divided in the 45 ° direction is illustrated, but in the case of the prediction direction other than the vertical and horizontal directions, the reference sample may be configured in the same manner as in FIG. 10 (c). have.
- the number of reference samples may be determined based on the size of the TU and / or the partition type of the TU.
- the total number of reference samples 1001c and 1002c of the TU is divided in a quad-tree manner in a square and is different from a TU having the same depth.
- Other numbers can be configured. That is, the total number of reference samples 1001c and 1002c may be configured to be different from the N ⁇ N-sized TU divided into square quad-trees.
- the reference sample may have a boundary (eg, a boundary of an adjacent TU).
- the number of reference samples may be determined according to the length).
- FIG. 11 is a diagram for comparing and comparing an existing block division scheme and an intra prediction mode based block division scheme according to the present invention.
- a split form of a TU is illustrated according to a split depth of the TU.
- FIG. 11 (a) illustrates a case in which a TU is divided by a conventional quad-tree scheme
- FIG. 11 (b) illustrates a case in which a TU is divided based on an intra prediction mode according to the present invention.
- the intra prediction mode may be determined in units of PUs in the intra prediction mode, and prediction and reconstruction may be performed in units of TUs.
- the TUs included in the PU are all predicted and reconstructed according to the same intra prediction mode.
- the prediction mode (PredMode) of the PU is A as shown in FIG. 11, regardless of whether the TU is partitioned from the CU in a conventional quad quadtree or whether the TU is split in a direction perpendicular to the intra prediction direction according to the present invention. Both TUs perform prediction and reconstruction according to the same prediction mode A. In FIG. 11, it is assumed that the prediction mode A is the intra mode prediction mode in the horizontal direction.
- the splitting direction is determined according to the direction of the intra prediction mode, but the number of splitting of the TUs may be the same as that of a conventional quad-tree. That is, in the case of a TU of depth 1, one CU is divided into 4 TUs, and in the case of a TU of depth 2, one CU is divided into 16 TUs.
- one CU (or TU) may be divided into four TUs of lower levels.
- FIG. 12 is a diagram more specifically illustrating an intra predictor according to an embodiment of the present invention.
- the intra predictor 182 (see FIG. 1, 262; FIG. 2) implements the functions, processes, and / or methods proposed in FIGS. 7 to 11.
- the intra prediction units 182 and 262 may include a TU splitter 1202 and an intra prediction processor 1203.
- intra prediction units 182 and 262 may further include a TU division scheme determination unit 1201.
- the TU partitioning scheme determination unit 1201 determines whether the current TU (or TB) partitioning scheme is a conventional quad-tree partitioning scheme or a partitioning scheme based on an intra prediction mode.
- the partitioning scheme of the current TU (or TB) may be determined based on the intra prediction mode.
- the intra prediction mode is defined as shown in Table 1 above
- the partitioning method of the TU (or TB) to which the non-directional intra prediction mode (ie, 0 and 1) is applied is determined as a square quad-tree partitioning method.
- the division scheme of the TU (or TB) to which the directional intra prediction mode (ie, 2 to 34) is applied may be determined as the intra prediction mode based division scheme.
- the TU division scheme determination unit 1201 performs intra prediction. It may not be included in the portions 182 and 262.
- the TU splitter 1202 may split the current TU (or TB) based on the intra prediction mode. In this case, the TU splitter 1202 divides the current TU (or TB) in a quad-tree manner in a direction orthogonal to the prediction direction of the intra prediction mode of the current TU (or TB) as illustrated in FIGS. 9 to 11. can do.
- the decoder may determine whether to divide the current TU (or TB) by using the division flag provided from the encoder.
- the TU splitter 1202 may split the current TU (or TB) in a conventional quad-tree splitting scheme.
- the intra prediction processor 1203 performs intra prediction for each TU (or TB).
- the intra prediction processor 1203 may perform intra prediction on the current TU (or TB) by using the process according to the example of FIG. 5.
- the reference sample may be configured according to the example of FIG. 10.
- FIG. 13 is a diagram illustrating an intra prediction mode based image signal processing method according to an embodiment of the present invention.
- the decoder determines whether the split flag of the current TU (or TB) is 1 (S1301).
- the position value (eg, coordinate value) for specifying the current TU (or TB) is set to the position value of the top-left sample of the current TU (or TB), whereby the current TU (or TB) ) Can be specified.
- the division flag may be provided as a syntax element from the encoder.
- step S1301 if the splitting flag is 1, the decoder splits the current TU (or TB) based on the intra prediction mode (S1302).
- the decoder may split the data into a form orthogonal to the prediction direction of the intra prediction mode of the current TU (or TB).
- dividing the current TU (or TB) means that a position value (eg, coordinate value) for specifying the current TU (or TB) is obtained from a specific sample of the TU (or TB) divided based on the intra prediction mode. It may mean that it is set to a position value (eg, a position value of a top-left sample).
- the divided TU (or TB) corresponds to the current TU (or TB), and step S1301 is performed again. Then, steps S1301 and S1302 are repeated until the current flag of the TU (or TB) is not 1.
- step S1301 if the splitting flag is 0, the decoder performs intra prediction on the current TU (or TB) based on the intra prediction mode (S1303).
- the decoder may perform intra prediction on the current TU (or TB) by using the process according to the example of FIG. 5.
- the reference sample may be configured according to the example of FIG. 10.
- the same operation may be performed except for the step S1301 in the step of FIG. 13. That is, the current TU (or TB) may be divided and intra prediction may be performed based on the intra prediction mode.
- FIG. 14 is a diagram illustrating an intra prediction mode based image signal processing method according to an embodiment of the present invention.
- a decoder determines a division scheme of a current TU (or TB) (S1401).
- the partitioning scheme of the current TU (or TB) may be determined based on the intra prediction mode.
- the intra prediction mode is defined as shown in Table 1 above
- the partitioning method of the TU (or TB) to which the non-directional intra prediction mode (ie, 0 and 1) is applied is determined as a square quad-tree partitioning method.
- the division scheme of the TU (or TB) to which the directional intra prediction mode (ie, 2 to 34) is applied may be determined as the intra prediction mode based division scheme.
- the position value (eg, coordinate value) for specifying the current TU (or TB) is set to the position value of the top-left sample of the current TU (or TB), whereby the current TU (or TB) ) Can be specified.
- step S1404 when the splitting scheme of the current TU (or TB) is a square quad-tree splitting scheme, the decoder determines whether a split flag of the current TU (or TB) is 1 (S1402).
- the division flag may be provided as a syntax element from the encoder.
- step S1402 if the splitting flag is 1, the decoder splits the current TU (or TB) in a square quad-tree manner (S1403).
- the decoder may split the current TU (or TB) in a square quad-tree scheme.
- dividing the current TU (or TB) means that the position value (for example, the coordinate value) for specifying the current TU (or TB) is the upper left side of the TU (or TB) in which the quadrature is divided in a square quad-tree manner. top-left) may be set to the position value of the sample.
- the divided TU (or TB) corresponds to the current TU (or TB), and step S1402 is performed again. Then, steps S1402 and S1403 are repeated until the split flag of the current TU (or TB) is not 1.
- step S1401 when the splitting scheme of the current TU (or TB) is an intra prediction mode based splitting scheme, the decoder determines whether the split flag of the current TU (or TB) is 1 (S1404). ).
- the division flag may be provided as a syntax element from the encoder.
- step S1404 if the splitting flag is 1, the decoder splits the current TU (or TB) based on the intra prediction mode (S1302).
- the decoder may split the data into a form orthogonal to the prediction direction of the intra prediction mode of the current TU (or TB).
- dividing the current TU (or TB) means that a position value (eg, coordinate value) for specifying the current TU (or TB) is obtained from a specific sample of the TU (or TB) divided based on the intra prediction mode. It may mean that it is set to a position value (eg, a position value of a top-left sample).
- the divided TU (or TB) corresponds to the current TU (or TB), and step S1404 is performed again. Then, steps S1404 and S1405 are repeated until the current flag of the TU (or TB) is not 1.
- step S1402 or S1404 if the split flag is 0, the decoder performs intra prediction on the current TU (or TB) based on the intra prediction mode (S1406).
- the decoder may perform intra prediction on the current TU (or TB) by using the process according to the example of FIG. 5.
- the reference sample may be configured according to the example of FIG. 10.
- the same operation may be performed except for the steps S1402 and S1404 in the step of FIG. 14. That is, the division scheme of the current TU (or TB) may be determined, and the intra prediction may be performed after partitioning the current TU (or TB) according to the division scheme.
- FIG. 15 is a diagram for describing a method of relocating (or reconfiguring) a transform unit according to an exemplary embodiment.
- FIG. 15 illustrates a case where an intra mode prediction direction is vertical and is divided into four TUs having a depth of 1 in a horizontal direction from a CU having a size of 2N ⁇ 2N.
- the TU divided in the form orthogonal to the intra prediction direction is rearranged (or reconstructed) to apply the transform of HEVC.
- a TU 0 1510 having a size of 2N ⁇ N / 2 is divided into two blocks 1511 and 1512 having a half horizontal size and rearranged in a vertical direction (or Reconstructed) to form a square TU 0 (1520) of size N ⁇ N.
- the TU may be rearranged according to a predetermined scan order. For example, according to the raster scan order, since the decoding process is performed before the left TU 0 1511 before the right TU 0 1512, when the TU is rearranged for conversion, the upper 1521 is replaced with the left TU 0 1511. And TU 0 1512 on the lower side 1522.
- the decoder performs the same process for the remaining TU 1, TU 2, and TU 3 in the same manner as above.
- the decoder performs prediction and reconstruction on the basis of each intra prediction mode in units of divided TUs. Then, the block is rearranged into a square block according to a predefined scan order, and the transform is performed in units of the relocated TUs.
- FIG. 16 is a diagram for explaining a conventional transform block partitioning method and a transform block reconstruction method according to the present invention.
- FIG. 16 a division type of a TU having a CU of 2N ⁇ 2N and a division depth of 1 is illustrated.
- FIG. 16 (a) illustrates a case where a TU is divided by a conventional quad-tree scheme
- FIG. 16 (b) illustrates a case where a TU is split based on an intra prediction direction according to the present invention.
- the intra mode prediction direction is vertical and is divided into four TUs in the horizontal direction.
- the decoder When a TU is partitioned by the existing quad quad-tree method as shown in FIG. 16 (a), the decoder performs prediction and reconstruction for each TU of a square shape according to a predefined scan order, and also performs transformation.
- a TU when a TU is divided based on an intra prediction mode, prediction and reconstruction are performed according to a predefined scan order in units of the TU divided to be perpendicular to the prediction direction of the intra prediction mode.
- the decoder performs rearrangement after rearranging (or reconstructing) the divided TUs so as to be perpendicular to the prediction direction, to square-shaped TUs.
- FIG. 15 and FIG. 16 illustrate the case in which the prediction direction of the intra prediction mode is a vertical direction, the above method may be equally applied even when the prediction direction is different from this.
- 17 is a view for explaining a method of relocating (or reconfiguring) a transform unit according to an embodiment of the present invention.
- FIG. 17 illustrates a case where an intra mode prediction direction is horizontal and is divided into four TUs having a depth of 1 in a vertical direction from a CU having a size of 2N ⁇ 2N.
- the TU partition type is determined according to the intra prediction direction, it is difficult to apply the transform provided by the HEVC, and thus, the TU partitioned in the form orthogonal to the intra prediction direction is relocated to apply the transform of the HEVC. (Or reconfigure).
- a TU 0 1710 having an N / 2 ⁇ 2N size is divided into two blocks 1711 and 1712 having a half vertical size and rearranged in a horizontal direction to form a square. It consists of TU 0 (1720) of the form NxN size.
- the TU may be rearranged according to a predetermined scan order. For example, according to the raster scan order, since the decoding process is performed before the upper TU 0 (1711) before the lower TU 0 (1712), the upper TU 0 (1711) to the left (1721) when relocating the TU for conversion.
- the lower TU 0 1712 may be disposed on the right side 1722.
- the decoder performs the same process for the remaining TU 1, TU 2, and TU 3 in the same manner as above.
- the decoder performs prediction and reconstruction on the basis of each intra prediction mode in units of divided TUs. Then, the block is rearranged into a square block according to a predefined scan order, and the transform is performed in units of the relocated TUs.
- FIG. 18 is a diagram for describing a method of relocating (or reconfiguring) a transform unit according to an embodiment of the present invention.
- the intra mode prediction direction is 135 ° (for example, INTRA_ANGULAR18 in the example of FIG. 6), and is divided into four TUs having a depth of 1 in a 45 ° direction from a 2N ⁇ 2N size CU. Illustrate the case.
- the decoder configures a square TU 0 1820 by rearranging (or reconstructing) samples included in the divided TU 0 1810 based on the intra prediction mode in a predetermined order.
- the TU may be rearranged (or reconfigured) according to a predetermined scan order. For example, according to the raster scan order, the samples included in the divided TU 0 1810 based on the intra prediction mode are sequentially started from the top-left sample to the bottom-right sample. It can be placed in the square TU 0 (1820).
- the square TU may be configured by rearranging (or reconstructing) the samples included in the corresponding TU in a square shape as illustrated in FIG. 18. It may be.
- FIG. 19 is a diagram more specifically illustrating a transform unit / inverse transform unit according to an embodiment of the present invention.
- the converter / inverse converter 120/150 (refer to FIG. 1 and 230; FIG. 2) is shown as one block, but the converter / inverse transform unit 120 (see FIG. 1 and 230) is shown. 2) corresponds to a transform unit or an inverse transform, and the transform / inverse transform processor 1093 corresponds to a transform processor or an inverse transform processor.
- the converters / inverse converters 120 and 230 are included in the decoder, they correspond to inverse converters, and the converter / inverse converter 1093 corresponds to inverse converters.
- the transform unit / inverse transform unit 120 and 230 implements the functions, processes, and / or methods proposed in FIGS. 15 to 18.
- the transform unit / inverse transform unit 120 and 230 may include a TU partition identification unit 1901, a TU reconstruction unit 1902, and a transform / inverse transform processing unit 1903.
- the TU partition identification unit 1901 identifies whether the current TU (or TB) is divided into squares. That is, it identifies whether the current TU (or TB) is partitioned by the existing square quad-tree method or the partitioning method based on the intra prediction mode.
- the TU partition identification unit 1901 may identify a partition scheme based on the intra prediction mode of the current TU (or TB). For example, when the intra prediction mode is defined as shown in Table 1 above, the partitioning method of the TU (or TB) to which the non-directional intra prediction mode (ie, 0 and 1) is applied is identified as a quadrature quad-tree partitioning method. In addition, the division scheme of the TU (or TB) to which the directional intra prediction mode (ie, 2 to 34) is applied may be identified as an intra prediction mode based division scheme.
- the TU reconstruction unit 1902 reconstructs (or rearranges) the current TU (or TB) into square blocks.
- the TU reconstruction unit 1902 may reconstruct (or relocate) the current TU (or TB) into a square block by using the reconstruction (or relocation) method of the TU (or TB) according to FIGS. 15 to 18. have.
- the transform / inverse transform processing unit 1903 performs a transform / inverse transform process on the current TU (or TB).
- the transform / inverse transform processing unit 1903 may convert / inverse transform in the manner described above with reference to FIGS. 1 and 2.
- 20 is a diagram illustrating an intra prediction mode based image signal processing method according to an embodiment of the present invention.
- the transform / inverse transform step is illustrated as one step for convenience of description, but the encoder may perform the transform or the inverse transform, and the decoder may perform the inverse transform.
- the decoder / encoder (in particular, the intra prediction unit) identifies whether the current TU (or TB) is a square block (S2001).
- the decoder / encoder may identify the division scheme based on the intra prediction mode of the current TU (or TB). For example, when the intra prediction mode is defined as shown in Table 1 above, the partitioning method of the TU (or TB) to which the non-directional intra prediction mode (ie, 0 and 1) is applied is identified as a quadrature quad-tree partitioning method. In addition, the division scheme of the TU (or TB) to which the directional intra prediction mode (ie, 2 to 34) is applied may be identified as an intra prediction mode based division scheme.
- step S2001 the decoder / encoder reconstructs (or rearranges) the current TU (or TB) into a square block if the current TU (or TB) is not a square block (S2002).
- the decoder / encoder may reconstruct (or reconfigure) the current TU (or TB) into a square block by using the reconstruction (or relocation) method of the TU (or TB) according to FIGS. 15 to 18. Relocation).
- the decoder / encoder may replace the current TU (or TB).
- the transformation / inverse transformation is performed on the target (S2003).
- the decoder / encoder may convert / inverse transform the current TU (or TB) to the target in the manner described above with reference to FIGS. 1 and 2.
- each component or feature is to be considered optional unless stated otherwise.
- Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention.
- the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.
- Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
- an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.
- ASICs application specific integrated circuits
- DSPs digital signal processors
- DSPDs digital signal processing devices
- PLDs programmable logic devices
- FPGAs field programmable gate arrays
- processors controllers, microcontrollers, microprocessors, and the like.
- an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above.
- the software code may be stored in memory and driven by the processor.
- the memory may be located inside or outside the processor, and may exchange data with the processor by various known means.
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Abstract
Description
Claims (13)
- 인트라 예측(intra prediction) 모드 기반으로 영상을 처리하는 방법에 있어서,처리 블록의 인트라 예측 모드에 기반하여 상기 처리 블록을 분할하는 단계; 및상기 분할된 처리 블록을 대상으로 인트라 예측을 수행하는 단계를 포함하고,상기 분할된 처리 블록의 분할 방향은 상기 처리 블록의 인트라 예측 모드의 예측 방향에 수직하는 인트라 예측 모드 기반 영상 처리 방법.
- 제1항에 있어서,상기 처리 블록의 분할 플래그가 1인 경우, 상기 처리 블록이 분할되는 인트라 예측 모드 기반 영상 처리 방법.
- 제1항에 있어서,상기 처리 블록의 인트라 예측 모드를 기반으로 상기 처리 블록이 정방형의 쿼드-트리 방식으로 분할되는지 상기 예측 방향에 수직하여 분할되는지 결정되는 인트라 예측 모드 기반 영상 처리 방법.
- 제3항에 있어서,상기 처리 블록의 인트라 예측 모드가 인트라 플래너(intra planar) 또는 인트라 DC(intra DC)인 경우, 상기 처리 블록은 정방형의 쿼드-트리 방식으로 분할되고,그렇지 않은 경우, 상기 처리 블록은 상기 예측 방향에 수직하여 분할되는 인트라 예측 모드 기반 영상 처리 방법.
- 제1항에 있어서,상기 분할된 처리 블록을 정방형의 블록으로 재구성하는 단계; 및상기 재구성된 처리 블록을 대상으로 변환/역변환을 수행하는 단계를 더 포함하는 인트라 예측 모드 기반 영상 처리 방법.
- 제5항에 있어서,상기 분할된 처리 블록이 2N×N/2인 경우,절반의 수평 크기(half horizontal size)를 가지는 2개의 블록으로 분할되고, 상기 2개의 블록이 수직 방향으로 재배치됨으로써 N×N 정방형의 블록이 재구성되는 인트라 예측 모드 기반 영상 처리 방법.
- 제5항에 있어서,상기 분할된 처리 블록이 N/2×2N인 경우,절반의 수직 크기(half vertical size)를 가지는 2개의 블록으로 분할되고, 상기 2개의 블록을 수평 방향으로 재배치됨으로써 N×N 정방형의 블록이 재구성되는 인트라 예측 모드 기반 영상 처리 방법.
- 제5항에 있어서,상기 분할된 처리 블록에 포함된 샘플이 미리 정해진 순서에 따라 재배치됨으로써 정방형의 블록이 재구성되는 인트라 예측 모드 기반 영상 처리 방법.
- 제1항에 있어서,상기 분할된 처리 블록에 대한 참조 샘플을 구성하는 단계를 더 포함하는 인트라 예측 모드 기반 영상 처리 방법.
- 제9항에 있어서,상기 분할된 처리 블록의 분할 방향이 수평 또는 수직 방향인 경우,상기 참조 샘플은 상기 분할된 처리 블록의 좌측(left) 경계에 인접한 샘플, 상기 분할된 처리 블록의 상측(top) 경계에 인접한 샘플 및 상기 분할된 처리 블록의 좌상측(top-left)에 이웃하는 샘플로 구성되는 인트라 예측 모드 기반 영상 처리 방법.
- 제9항에 있어서,상기 처리 블록의 분할 방향이 45°인 경우,상기 참조 샘플은 상기 분할된 처리 블록의 좌측(left) 경계에 인접한 샘플, 상기 분할된 처리 블록의 상측(top) 경계에 인접한 샘플 및 상기 분할된 처리 블록의 좌상측(top-left)에 이웃하는 샘플로 구성되는 인트라 예측 모드 기반 영상 처리 방법.
- 제9항에 있어서,상기 처리 블록의 분할 방향이 45°인 경우,상기 참조 샘플은 상기 분할된 처리 블록의 좌상측(top-left) 경계에 인접한 샘플, 우측(right) 경계에 인접한 샘플 및 하측(bottom) 경계에 인접한 샘플로 구성되는 인트라 예측 모드 기반 영상 처리 방법.
- 인트라 예측(intra prediction) 모드 기반으로 영상을 처리하는 장치에 있어서,처리 블록의 인트라 예측 모드에 기반하여 상기 처리 블록을 분할하는 분할부; 및상기 분할된 처리 블록을 대상으로 인트라 예측을 수행하는 인트라 예측 처리부를 포함하고,상기 분할된 처리 블록의 분할 방향은 상기 처리 블록의 인트라 예측 모드의 예측 방향에 수직하는 장치.
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KR20200097825A (ko) | 2020-08-19 |
US10880553B2 (en) | 2020-12-29 |
US11575907B2 (en) | 2023-02-07 |
KR102145439B1 (ko) | 2020-08-18 |
CN111885381A (zh) | 2020-11-03 |
US20180098074A1 (en) | 2018-04-05 |
KR20230088846A (ko) | 2023-06-20 |
KR102250070B1 (ko) | 2021-05-11 |
CN111885379B (zh) | 2023-10-27 |
EP3276958A1 (en) | 2018-01-31 |
CN107409207B (zh) | 2020-07-28 |
KR102543471B1 (ko) | 2023-06-15 |
US12028531B2 (en) | 2024-07-02 |
US20230232018A1 (en) | 2023-07-20 |
KR20210054050A (ko) | 2021-05-12 |
US20200084455A1 (en) | 2020-03-12 |
US10506238B2 (en) | 2019-12-10 |
CN111885381B (zh) | 2023-10-13 |
CN111885379A (zh) | 2020-11-03 |
US20210112255A1 (en) | 2021-04-15 |
KR20170126918A (ko) | 2017-11-20 |
CN111885380B (zh) | 2024-04-12 |
CN107409207A (zh) | 2017-11-28 |
KR102351431B1 (ko) | 2022-01-17 |
KR20220009502A (ko) | 2022-01-24 |
CN111885380A (zh) | 2020-11-03 |
KR102403685B1 (ko) | 2022-05-30 |
KR20220074995A (ko) | 2022-06-03 |
EP3276958A4 (en) | 2018-08-29 |
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