WO2021040330A1 - Method and device for coding and decoding - Google Patents

Method and device for coding and decoding Download PDF

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Publication number
WO2021040330A1
WO2021040330A1 PCT/KR2020/011171 KR2020011171W WO2021040330A1 WO 2021040330 A1 WO2021040330 A1 WO 2021040330A1 KR 2020011171 W KR2020011171 W KR 2020011171W WO 2021040330 A1 WO2021040330 A1 WO 2021040330A1
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pixel value
current coding
coding block
prediction
reference pixel
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PCT/KR2020/011171
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English (en)
French (fr)
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Xiao OUYANG
Fan Wang
Zhuoyi LV
Yinji Piao
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Samsung Electronics Co., Ltd.
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Definitions

  • the present disclosure relates to a technical field of video coding and decoding. More specifically, the present disclosure relates to a method and device for coding and decoding.
  • an image is generally divided into multiple image blocks, and then each image block is encoded or decoded.
  • Steps of coding the image block can include prediction, transformation, quantization, and entropy coding, wherein the prediction is to obtain prediction pixel values by performing prediction on a current image block to be encoded using the reconstructed pixel values (these pixels are referred to as reference pixels) of previously encoded image blocks, and then to encode the difference between the actual value and the prediction pixel value of the current image block into the bitstream.
  • a decoder also needs to obtain the prediction pixel values by performing prediction on the current image block to be decoded using the reconstructed pixel values (these pixels are referred to as reference pixel) of the previously decoded image blocks, and then to obtain reconstructed values of the decoded image block by adding the decoded difference values derived from the bitstream to the prediction pixel values.
  • the same reference pixel and the same prediction method in performing prediction must be adopted for both of coding and decoding.
  • the encoder selects a prediction mode according to the current image block, and then writes information about the selected prediction mode into the bitstream for informing the decoder, so that the decoder can perform prediction on the current coding block using the same prediction mode.
  • IPF Intra Prediction Filter
  • TCPM Two Step Cross Component Prediction Mode
  • DT Derived Tree
  • IPF obtains a new prediction pixel value by applying weights to part of the intra-prediction pixel values in the current coding block and the prediction pixel value on the left side (12) or the prediction pixel value on the upper side (14) of a current coding block (10), and to use the new prediction pixel value as the final prediction pixel value for the intra prediction, as shown in FIG. 1.
  • TSCPM finds two reference samples (24) from the reference pixels on the left side (22) and the reference pixels (28) on the upper side (26) of a current block (20), and constructs a linear model of a luminance component and a chrominance component based on the reference samples (24, 28), and finally predicts the chrominance component by using the linear model, as shown in FIG. 2.
  • the so-called DT partitions a current coding block into multiple prediction blocks (PU), performs prediction on each prediction block, and partitions the prediction block into transform blocks (TU) for transformation and quantization operations, as shown in FIG. 3.
  • the current coding block or prediction block not only can acquire the reference information of the left side and the reference information of the upper side of the current block (including the intra prediction direction, reference pixel values, etc.), but also can acquire the reference information of the right side of the current block.
  • New intra-prediction technologies IPF, TSCPM, DT, etc. do not consider how to use this information to further improve coding efficiency when more reference information is available.
  • a right-to-left coding order is proposed in MPEG EVC. This will enable the encoder to obtain the reference pixels on the right side of the current block when coding the current block.
  • the existing intra prediction technology only considers a case in which the reference information of the left side and the reference information of the upper side of the current block are available, but does not consider a case in which the reference information of the right side of the current block is available and a case in which both of the reference information of the left side and the reference information of the right side are available.
  • the exemplary embodiments of the present disclosure lie in providing a method and device for coding and decoding, to improve the efficiency of intra coding by maximize the use of surrounding reference pixel information.
  • a coding method comprising performing intra prediction on a current coding block based on availabilities of reference pixels of the current coding block, and writing information of intra prediction into a bitstream, wherein the information of intra prediction at least comprises information about an intra prediction mode of the current coding block.
  • the method and device for coding and decoding according to the exemplary embodiment of the present disclosure adopt a flexible coding order, expand the spatial reference information, and design Intra Prediction Filter (IPF) technology, Two Step Cross Component Prediction Mode (TSCPM) technology, and Derived Tree (DT) technology according to availabilities of adjacent reference pixel on the left side and the right side of the currently coding or decoding image block, which makes use of surrounding reference pixel information to the maximum extent so that the efficiency of intra coding is improved.
  • IPF Intra Prediction Filter
  • TCPM Two Step Cross Component Prediction Mode
  • DT Derived Tree
  • FIG. 1 illustrates a schematic diagram of reference pixels on the upper side and reference pixels on the left side of a current coding block in IPF technology
  • FIG. 2 illustrates a schematic diagram of finding two reference samples from reference pixels on the left side and the top side of the current coding block in TSCPM technology
  • FIG. 3 illustrates a schematic diagram of partitioning a coding block into prediction blocks in DT technology
  • FIG. 4 illustrates a flowchart of a coding method according to one exemplary embodiment of the present disclosure
  • FIG. 5 illustrates a schematic diagram of reference pixels on the upper side and reference pixels on the right side of a current coding block being available according to an exemplary embodiment of the present disclosure
  • FIG. 6 illustrates a schematic diagram of the reference pixels on the upper side, the reference pixels on the left side and the reference pixels on the right side of the current coding block according to an exemplary embodiment of the present disclosure
  • FIG. 7 illustrates a flowchart of a decoding method according to an exemplary embodiment of the present disclosure
  • FIG. 8 illustrates a flowchart of a coding method according to another exemplary embodiment of the present disclosure
  • FIG. 9 illustrates a schematic diagram of reference samples in TSCPM technology according to an exemplary embodiment of the present disclosure
  • FIG. 10 illustrates a flowchart of a decoding method according to another exemplary embodiment of the present disclosure
  • FIG. 11 illustrates a flowchart of a coding method according to another exemplary embodiment of the present disclosure
  • FIG. 12 illustrates a diagram of a coding order of prediction blocks according to an exemplary embodiment of the present disclosure
  • FIG. 13 illustrates a diagram of a coding order of prediction blocks according to another exemplary embodiment of the present disclosure
  • FIG. 14 illustrates a diagram of a coding order of prediction blocks according to another exemplary embodiment of the present disclosure
  • FIG. 15 illustrates a diagram of a coding order of transform blocks in a prediction block according to another exemplary embodiment of the present disclosure
  • FIG. 16 illustrates a diagram of a coding order of transform blocks in a prediction block according to another exemplary embodiment of the present disclosure
  • FIG. 17 illustrates a diagram of a coding order of transform blocks in a prediction block according to another exemplary embodiment of the present disclosure
  • FIG. 18 illustrates a flowchart of a decoding method according to another exemplary embodiment of the present disclosure
  • FIG. 19 illustrates a block diagram of a coding device according to an exemplary embodiment of the present disclosure
  • FIG. 20 illustrates a block diagram of a decoding device according to an exemplary embodiment of the present disclosure
  • FIG. 21 illustrates a block diagram of a coding device according to another exemplary embodiment of the present disclosure
  • FIG. 22 illustrates a block diagram of a decoding device according to another exemplary embodiment of the present disclosure
  • FIG. 23 illustrates a block diagram of a coding device according to another exemplary embodiment of the present disclosure.
  • FIG. 24 illustrates a block diagram of a decoding device according to another exemplary embodiment of the present disclosure.
  • FIG. 25 illustrates a schematic diagram of a computing device according to an exemplary embodiment of the present disclosure.
  • a coding method comprising performing intra prediction on a current coding block based on availabilities of reference pixels of the current coding block, and writing information of intra prediction into a bitstream, wherein the information of intra prediction at least comprises information about an intra prediction mode of the current coding block.
  • the performing the intra prediction on the current coding block may comprise traversing all intra prediction modes for the current coding block to obtain a prediction pixel value corresponding to each intra prediction mode and performing intra prediction filtering on the prediction pixel value to obtain a final prediction pixel value corresponding to each intra prediction mode, calculating a rate distortion cost corresponding to each intra prediction mode according to the final prediction pixel value, and using an intra prediction mode with the lowest rate distortion cost as the intra prediction mode of the current coding block according to the rate distortion cost of each intra prediction mode.
  • the performing the intra prediction filtering on the prediction pixel value may comprise performing the intra prediction filtering according to the intra prediction mode of the current coding block and a reference pixel value on the left side of the current coding block when the reference pixel value on the left side of the current coding block is available and a reference pixel value on the right side of the current coding block is not available, performing the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the right side of the current coding block when the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available, performing the intra prediction filtering according to the intra prediction mode of the current coding block, the reference pixel value on the left side of the current coding block and/or the reference pixel value on the right side of the current coding block when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available, and padding the reference pixel value on
  • the performing the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the right side of the current coding block may comprise obtaining the final prediction pixel value by applying weights to the prediction pixel value on the upper side, the prediction pixel value on the right side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block when the intra prediction mode of the current coding block is not an angular prediction mode, and calculating the final prediction pixel value according to an angle between a prediction direction of the current coding block and the horizontal direction or the vertical direction when the intra prediction mode of the current coding block is the angular prediction mode.
  • the calculating the final prediction pixel value according to the angle between the prediction direction of the current coding block and the horizontal direction or the vertical direction may comprise obtaining the final prediction pixel value by applying weights to the prediction pixel value on the upper side and the reference pixel value on the upper side of the current coding block when the angle between the prediction direction of the current coding block and the horizontal direction is less than a first angle, and obtaining the final prediction pixel value by applying weights to the prediction pixel value on the right side and the reference pixel value on the right side of the current coding block when the angle between the prediction direction of the current coding block and the vertical direction is less than a second angle.
  • the performing the intra prediction filtering according to the intra prediction mode of the current coding block, the reference pixel value on the left side of the current coding block and/or the reference pixel value on the right side of the current coding block may comprise performing the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the left side of the current coding block, or, performing the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the right side of the current coding block, or, performing the intra prediction filtering according to the intra prediction mode of the current coding block, the reference pixel value on the left side of the current coding block, and the reference pixel value on the right side of the current coding block, or, selecting an intra filtering mode with the lowest rate distortion cost to perform intra prediction filtering from among the intra filtering modes of an intra filtering mode in which the intra prediction filtering is performed according to the intra prediction mode of the current coding block and the reference pixel value on the left side of the current coding block,
  • the performing the intra prediction filtering according to the intra prediction mode of the current coding block, the reference pixel value on the left side of the current coding block and the reference pixel value on the right side of the current coding block may comprise obtaining the final prediction pixel value on the upper left side of the current coding block by applying weights to the prediction pixel value on the upper left side, the reference pixel value on the upper side and the reference pixel value on the left side of the current coding block, obtaining the final prediction pixel value on the left side of the current coding block by applying weights to the prediction pixel value on the left side, the reference pixel value on the upper side and the reference pixel value on the left side of the current coding block, obtaining the final prediction pixel value on the upper right side of the current coding block by applying weights to the prediction pixel value on the upper right side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block, and obtaining the final prediction pixel value on the right side of the current coding block
  • the information of intra prediction may further comprise information about the intra filtering mode of the current coding block, when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • a decoding method comprising: parsing information of intra prediction from a bitstream, wherein the information of intra prediction at least comprises information about an intra prediction mode of a current coding block; calculating a prediction pixel value of a current coding block according to the parsed information of intra prediction, based on availabilities of reference pixels of the current coding block; and obtaining a decoded image by reconstructing an image according to the prediction pixel value.
  • the information of intra prediction may further comprise information about the intra filtering mode of the current coding block, when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • the calculating a prediction pixel value of the current coding block may comprise performing the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the left side of the current coding block when the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available, performing the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the right side of the current coding block when the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available, performing the intra prediction filtering according to the intra prediction mode of the current coding block, the reference pixel value on the left side of the current coding block and/or the reference pixel value on the right side of the current coding block when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available, and padding the reference pixel value on
  • the performing the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the right side of the current coding block may comprise obtaining the final prediction pixel value on the upper side of the current coding block by applying weights to the prediction pixel value on the upper side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block and obtaining the final prediction pixel value on the right side of the current coding block by applying weights to the prediction pixel value on the right side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block, when the intra prediction mode of the current coding block is not an angular prediction mode, and calculating the final prediction pixel value according to an angle between a prediction direction of the current coding block and the horizontal direction or the vertical direction, when the intra prediction mode of the current coding block is the angular prediction mode.
  • the calculating the final prediction pixel value according to the angle between the prediction direction of the current coding block and the horizontal direction or the vertical direction may comprise obtaining the final prediction pixel value on the upper side of the current coding block by applying weights to the prediction pixel value on the upper side and the reference pixel value on the upper side of the current coding block, when the angle between the prediction direction of the current coding block and the horizontal direction is less than a first angle, and obtaining the final prediction pixel value on the right side of the current coding block by applying weights to the prediction pixel value on the right side and the reference pixel value on the right side of the current coding block, when the angle between the prediction direction of the current coding block and the vertical direction is less than a second angle.
  • the performing the intra prediction filtering according to the intra prediction mode of the current coding block, the reference pixel value on the left side of the current coding block and/or the reference pixel value on the right side of the current coding block may comprise performing the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the left side of the current coding block, or, performing the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the right side of the current coding block, or, performing the intra prediction filtering according to the intra prediction mode of the current coding block, the reference pixel value on the left side of the current coding block, and the reference pixel value on the right side of the current coding block, or, performing the intra prediction filtering according to the parsed intra prediction mode.
  • the performing the intra prediction filtering according to the intra prediction mode of the current coding block, the reference pixel value on the left side of the current coding block, and the reference pixel value on the right side of the current coding block may comprise obtaining the final prediction pixel value on the upper left side of the current coding block by applying weights to the prediction pixel value on the upper left side, the reference pixel value on the left side and the reference pixel value on the upper side of the current coding block, obtaining the final prediction pixel value on the left side of the current coding block by applying weights to the prediction pixel value on the left side, the reference pixel value on the left side and the reference pixel value on the upper side of the current coding block, obtaining the final prediction pixel value on the upper right side of the current coding block by applying weights to the prediction pixel value on the upper right side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block, and obtaining the final prediction pixel value on the right side of the current coding block
  • a coding method comprising: determining reference samples for constructing a linear model based on availabilities of reference pixels of a current coding block, and constructing the linear model based on the determined reference samples; calculating a prediction pixel value of a chrominance component of the current coding block according to the constructed linear model, and determining an intra prediction mode of the current coding block; and writing the information of the intra prediction into a bitstream, wherein the information of the intra prediction at least comprises information about whether the intra prediction mode of the current coding block is a Two Step Cross Component Prediction Mode (TSCPM) mode.
  • TCPM Two Step Cross Component Prediction Mode
  • the determining reference samples for constructing a linear model may comprise selecting two reference samples from the reference pixels on the upper side and the reference pixels on the left side, respectively, when the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available; selecting two reference samples from the reference pixels on the upper side and the reference pixels on the right side, respectively, when the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available; selecting reference samples according to the case in which the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available, or, selecting reference samples according to the case in which the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available, or, selecting reference samples according to a case in which the rate distortion cost is small in the above two
  • the information of the intra prediction may further comprise information about reference pixel construction, when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • a decoding method comprising: parsing information of intra prediction from a bitstream, wherein the information of intra prediction at least comprises information about whether the intra prediction mode of a current coding block is TSCPM mode; determining reference samples for constructing a linear model based on availabilities of reference pixels of the current coding block, and constructing the linear model based on the determined reference samples; calculating a prediction pixel value of a chrominance component of the current coding block according to the constructed linear model; and obtaining a decoded image by reconstructing the chrominance component of the current coding block according to the prediction pixel value of the chrominance component of the current coding block.
  • the information of the intra prediction may further comprise information about the reference pixel construction, when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • the determining reference samples for constructing a linear model may comprise selecting two reference samples from the reference pixels on the upper side and the reference pixels on the left side, respectively, when the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available; selecting two reference samples from the reference pixels on the upper side and the reference pixels on the right side, respectively, when the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available, selecting reference samples according to the case in which the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available, or, selecting reference samples according to the case in which the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available, or, selecting reference samples according to the parsed information about the reference pixel construction.
  • a coding method comprising determining a coding order of prediction blocks in a current coding block based on a block partitioning mode and availabilities of reference pixels of the current coding block, determining a coding order of transform blocks in each prediction block of the current coding block, based on the block partitioning mode and the availabilities of the reference pixels of the current coding block, and writing Derived Tree (DT) mode information into a bitstream based on the determined coding order of the prediction blocks in the current coding block and the determined coding order of the transform blocks in the prediction block, wherein the DT mode information at least comprises information about the block partitioning mode of the current coding block.
  • DT Derived Tree
  • the determining a coding order of prediction blocks in a current coding block may comprise determining the coding order of the prediction blocks to be left-to-right when the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available; determining the coding order of the prediction blocks to be right-to-left when the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available; determining the coding order of the prediction blocks to be left-to-right when neither the reference pixel value on the left side nor the reference pixel value on the right side of the current coding block is available; and determining the coding order of the prediction blocks to be one of a left-to-right coding order, a right-to-left coding order, and a coding order with a lower rate distortion cost of the left-to-right coding order and the right-
  • the determining the coding order of transform blocks in each prediction block of the current coding block may comprise determining the coding order of the transform blocks to be left-to-right when the reference pixel value on the left side of the current prediction block is available and the reference pixel value on the right side of the current prediction block is not available; determining the coding order of the transform blocks to be right-to-left when the reference pixel value on the left side of the current prediction block is not available and the reference pixel value on the right side of the current prediction block is available; determining the coding order of the transform blocks to be left-to-right when neither the reference pixel value on the left side nor the reference pixel value on the right side of the current prediction block is available; and determining the coding order of the transform blocks to be one of a left-to-right coding order, a right-to-left coding order, and a coding order with a lower rate distortion cost of the left-to-right coding order and the right-to-left
  • the DT mode information may further comprise information about the coding order of the prediction blocks in the current coding block and/or information about the coding order of the transform blocks in each prediction block of the current coding block, when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • a decoding method comprising parsing DT mode information from a bitstream, wherein the DT mode information at least comprises information about a block partitioning mode of a current coding block; determining a decoding order of prediction blocks in a current coding block based on the block partitioning mode and availabilities of reference pixels of the current coding block; determining a decoding order of transform blocks in each prediction block of the current coding block based on the block partitioning mode and the availabilities of the reference pixels of the current coding block; and performing decoding according to the determined decoding order of the prediction blocks in the current coding block and the determined decoding order of the transform blocks in the prediction block.
  • the DT mode information may further comprise information about the coding order of the prediction blocks in the current coding block and/or information about the coding order of the transform blocks in each prediction block of the current coding block.
  • the determining a coding order of prediction blocks in the current coding block may comprise determining the decoding order of the prediction blocks to be left-to-right when the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available; determining the decoding order of the prediction blocks to be right-to-left when the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available; determining the decoding order of the prediction blocks to be left-to-right when neither the reference pixel value on the left side nor the reference pixel value on the right side of the current coding block is available; and determining the decoding order of the prediction blocks to be one of a left-to-right decoding order, a right-to-left decoding order, and a decoding order of the prediction blocks determined according to information about the decoding order of the prediction blocks when both of the reference
  • the determining the coding order of transform blocks in each prediction block of the current coding block may comprise determining the decoding order of the transform blocks to be left-to-right when the reference pixel value on the left side of the current prediction block is available and the reference pixel value on the right side of the current prediction block is not available; determining the decoding order of the transform blocks to be right-to-left when the reference pixel value on the left side of the current prediction block is not available and the reference pixel value on the right side of the current prediction block is available; determining the decoding order of the transform blocks to be left-to-right when neither the reference pixel value on the left side nor the reference pixel value on the right side of the current prediction block is available, and determining the decoding order of the transform blocks to be one of a left-to-right decoding order, a right-to-left decoding order, and a decoding order of the transform blocks in the prediction block determined according to information about the decoding order of the transform blocks when both of
  • a coding device comprising an intra prediction unit configured to perform intra prediction on a current coding block based on availabilities of reference pixels of the current coding block, and an information writing unit configured to write information of intra prediction into a bitstream, wherein the information of intra prediction at least comprises information about an intra prediction mode of the current coding block.
  • the intra prediction unit may be configured to traverse all intra prediction modes for the current coding block to obtain a prediction pixel value corresponding to each intra prediction mode and to perform intra prediction filtering on the prediction pixel value to obtain a final prediction pixel value corresponding to each intra prediction mode, to calculate a rate distortion cost corresponding to each intra prediction mode according to the final prediction pixel value, and to use an intra prediction mode with the lowest rate distortion cost as the intra prediction mode of the current coding block according to the rate distortion cost of each intra prediction mode.
  • the intra prediction unit may be further configured to perform the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the left side of the current coding block when the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available; to perform the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the right side of the current coding block when the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available; to peform the intra prediction filtering according to the intra prediction mode of the current coding block, the reference pixel value on the left side of the current coding block and/or the reference pixel value on the right side of the current coding block when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available; and to pad the reference pixel value on the left side or
  • the intra prediction unit may be further configured to obtain the final prediction pixel value by applying weights to the prediction pixel value on the upper side, the prediction pixel value on the right side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block when the intra prediction mode of the current coding block is not an angular prediction mode, and to calculate the final prediction pixel value according to an angle between a prediction direction of the current coding block and the horizontal direction or the vertical direction when the intra prediction mode of the current coding block is the angular prediction mode.
  • the intra prediction unit may be further configured to obtain the final prediction pixel value by applying weights to the prediction pixel value on the upper side and the reference pixel value on the upper side of the current coding block when the angle between the prediction direction of the current coding block and the horizontal direction is less than a first angle, and to obtain the final prediction pixel value by applying weights to the prediction pixel value on the right side and the reference pixel value on the right side of the current coding block when the angle between the prediction direction of the current coding block and the vertical direction is less than a second angle.
  • the intra prediction unit may be further configured to perform the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the left side of the current coding block, or, to perform the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the right side of the current coding block, or, to perform the intra prediction filtering according to the intra prediction mode of the current coding block, the reference pixel value on the left side of the current coding block, and the reference pixel value on the right side of the current coding block, or, to select an intra filtering mode with the lowest rate distortion cost to perform intra prediction filtering from among the intra filtering modes of an intra filtering mode in which the intra prediction filtering is performed according to the intra prediction mode of the current coding block and the reference pixel value on the left side of the current coding block, an intra filtering mode in which the intra prediction filtering is performed according to the intra prediction mode of the current coding block and the reference pixel value on the right side of the current coding block,
  • the intra prediction unit may be further configured to obtain the final prediction pixel value on the upper left side of the current coding block by applying weights to the prediction pixel value on the upper left side, the reference pixel value on the upper side and the reference pixel value on the left side of the current coding block and to obtain the final prediction pixel value on the left side of the current coding block by applying weights to the prediction pixel value on the left side, the reference pixel value on the upper side and the reference pixel value on the left side of the current coding block, to obtain the final prediction pixel value on the upper right side of the current coding block by applying weights to the prediction pixel value on the upper right side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block, and to obtain the final prediction pixel value on the right side of the current coding block by applying weights to the prediction pixel value on the right side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block, when the intra
  • the information of intra prediction may further comprise information about the intra filtering mode of the current coding block, when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • a decoding device comprising a prediction mode parsing unit configured to parse information of intra prediction from a bitstream, wherein the information of intra prediction at least comprises information about an intra prediction mode of a current coding block, a pixel value prediction unit configured to calculate a prediction pixel value of a current coding block according to the parsed information of intra prediction, based on availabilities of reference pixels of the current coding block, and an image reconstruction unit configured to obtain a decoded image by reconstructing an image according to the prediction pixel value.
  • the information of intra prediction may further include information about the intra filtering mode of the current coding block, when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • the pixel value prediction unit may be further configured to perform the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the left side of the current coding block when the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available, to perform the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the right side of the current coding block when the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available, to perform the intra prediction filtering according to the intra prediction mode of the current coding block, the reference pixel value on the left side of the current coding block and/or the reference pixel value on the right side of the current coding block when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available and to pad the reference pixel value on the left side or
  • the pixel value prediction unit may be further configured to obtain the final prediction pixel value on the upper side of the current coding block by applying weights to the prediction pixel value on the upper side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block and to obtain the final prediction pixel value on the right side of the current coding block by applying weights to the prediction pixel value on the right side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block, when the intra prediction mode of the current coding block is not an angular prediction mode, and to calculate the final prediction pixel value according to an angle between a prediction direction of the current coding block and the horizontal direction or the vertical direction, when the intra prediction mode of the current coding block is the angular prediction mode.
  • the pixel value prediction unit may be further configured to obtain the final prediction pixel value on the upper side of the current coding block by applying weights to the prediction pixel value on the upper side and the reference pixel value on the upper side of the current coding block, when the angle between the prediction direction of the current coding block and the horizontal direction is less than a first angle, and to obtain the final prediction pixel value on the right side of the current coding block by applying weights to the prediction pixel value on the right side and the reference pixel value on the right side of the current coding block, when the angle between the prediction direction of the current coding block and the vertical direction is less than a second angle.
  • the pixel value prediction unit may be further configured to perform the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the left side of the current coding block, or, to perform the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the right side of the current coding block, or, to perform the intra prediction filtering according to the intra prediction mode of the current coding block, the reference pixel value on the left side of the current coding block, and the reference pixel value on the right side of the current coding block, or, to perform the intra prediction filtering according to the parsed intra prediction mode.
  • the pixel value prediction unit may be further configured to obtain the final prediction pixel value on the upper left side of the current coding block by applying weights to the prediction pixel value on the upper left side, the reference pixel value on the upper side and the reference pixel value on the upper side of the current coding block, to obtain the final prediction pixel value on the left side of the current coding block by applying weights to the prediction pixel value on the left side, the reference pixel value on the upper side and the reference pixel value on the upper side of the current coding block, to obtain the final prediction pixel value on the upper right side of the current coding block by applying weights to the prediction pixel value on the upper right side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block, and to obtain the final prediction pixel value on the right side of the current coding block by applying weights to the prediction pixel value on the right side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block, and to obtain
  • a coding device comprising a model constructing unit configured to determine reference samples for constructing a linear model based on availabilities of reference pixels of the current coding block and to construct a linear model based on the determined reference samples, a mode determining unit configured to calculate a prediction pixel value of a chrominance component of a current coding block according to the constructed linear model, and to determine an intra prediction mode of the current coding block, and a TSCPM mode writing unit configured to write the information of the intra prediction into a bitstream, wherein the information of the intra prediction at least comprises information about whether the intra prediction mode of the current coding block is TSCPM mode.
  • the mode determining unit may be configured to select two reference samples from the reference pixels on the upper side and the reference pixels on the left side, respectively, when the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available, to select two reference samples from the reference pixels on the upper side and the reference pixels on the right side, respectively, when the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available, to select reference samples according to the case in which the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available, or, to select reference samples according to the case in which the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available, or, to select reference samples according to a case in which the rate distortion cost is small in the above two cases
  • the information of the intra prediction may further comprise information about the reference pixel construction, when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • a decoding device comprising a TSCPM mode parsing unit configured to parse information of intra prediction from a bitstream, wherein the information of intra prediction at least comprises information about whether an intra prediction mode of a current coding block is TSCPM mode, a model constructing unit configured to determine reference samples for constructing a linear model based on availabilities of reference pixels of the current coding block and to construct the linear model based on the determined reference samples, a chrominance prediction unit configured to calculate a prediction pixel value of a chrominance component of a current coding block according to the constructed linear model, and a chrominance reconstruction unit configured to obtain a decoded image by reconstructing the chrominance component of the current coding block, according to the prediction pixel value of the chrominance component of the current coding block.
  • the information of the intra prediction may further comprise information about the reference pixel construction, when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • the model constructing unit may be configured to select two reference samples from the reference pixels on the upper side and the reference pixels on the left side, respectively, when the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available, to select two reference samples from the reference pixels on the upper side and the reference pixels on the right side, respectively, when the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available, to select reference samples according to the case in which the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available, or, to select reference samples according to the case in which the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available, or, to select reference samples according to the parsed information about the reference pixel construction.
  • a coding device comprising a first coding order determining unit configured to determine a coding order of prediction blocks in a current coding block based on a block partitioning mode and availabilities of reference pixels of the current coding block, a second coding order determining unit configured to determine a coding order of transform blocks in each prediction block of the current coding block, based on the block partitioning mode and the availabilities of the reference pixels of the current coding block, and a coding unit configured to write Derived Tree (DT) mode information into a bitstream based on the determined coding order of the prediction blocks in the current coding block and the determined coding order of the transform blocks in the prediction block, wherein the DT mode information at least comprises information about the block partitioning mode of the current coding block.
  • DT Derived Tree
  • the first coding order determining unit may be configured, when the block partitioning mode is vertical partitioning, to determine the coding order of the prediction blocks to be left-to-right when the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available, to determine the coding order of the prediction blocks to be right-to-left when the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available, to determine the coding order of the prediction blocks to be left-to-right when neither the reference pixel value on the left side nor the reference pixel value on the right side of the current coding block is available, and to determine the coding order of the prediction blocks to be one of a left-to-right coding order, a right-to-left coding order, and a coding order with a lower rate distortion cost of the left-to-right coding order and the right-to-left coding order when both
  • the second coding order determining unit may be configured, when the block partitioning mode is vertical partitioning, to determine the coding order of the transform blocks to be left-to-right when the reference pixel value on the left side of the current prediction block is available and the reference pixel value on the right side of the current prediction block is not available, to determine the coding order of the transform blocks to be right-to-left when the reference pixel value on the left side of the current prediction block is not available and the reference pixel value on the right side of the current prediction block is available, to determine the coding order of the transform blocks to be left-to-right when neither the reference pixel value on the left side nor the reference pixel value on the right side of the current prediction block is available, and to determine the coding order of the transform blocks to be s one of a left-to-right coding order, a right-to-left coding order, and a coding order with a lower rate distortion cost of the left-to-right coding order and the right-to-left coding order when both of the reference
  • the DT mode information may further comprise information about the coding order of the prediction blocks in the current coding block and/or information about the coding order of the transform blocks in each prediction block of the current coding block, when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • a decoding device comprising a DT information parsing unit configured to parsing DT mode information from a bitstream, wherein the DT mode information at least comprises information about the block partitioning mode of a current coding block, a first decoding order determining unit configured to determine a decoding order of prediction blocks in a current coding block based on a block partitioning mode and availabilities of reference pixels of the current coding block, a second decoding order determining unit configured to determine a decoding order of transform blocks in each prediction block of the current coding block, based on the block partitioning mode and the availabilities of the reference pixels of the current coding block, and a decoding unit configured to perform decoding according to the determined decoding order of the prediction blocks in the current coding block and the determined decoding order of the transform blocks in the prediction block.
  • the DT mode information may further comprise information about the decoding order of the prediction blocks in the current coding block and/or information about the decoding order of the transform blocks in each prediction block of the current coding block.
  • the first decoding order determining unit may be configured, when the block partitioning mode is vertical partitioning, to determine the decoding order of the prediction blocks to be left-to-right when the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available, to determine the decoding order of the prediction blocks to be right-to-left when the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available, to determine the decoding order of the prediction blocks to be left-to-right when neither the reference pixel value on the left side nor the reference pixel value on the right side of the current coding block is available, and to determine the decoding order of the prediction blocks to be one of a left-to-right decoding order, a right-to-left decoding order, and a decoding order of the prediction blocks determined according to information about the decoding order of the prediction blocks when both of the reference pixel value on the left side
  • the second decoding order determining unit may be configured, when the block partitioning mode is vertical partitioning, to determine the decoding order of the transform blocks to be left-to-right when the reference pixel value on the left side of the current prediction block is available and the reference pixel value on the right side of the current prediction block is not available, to determine the decoding order of the transform blocks to be right-to-left when the reference pixel value on the left side of the current prediction block is not available and the reference pixel value on the right side of the current prediction block is available, to determine the decoding order of the transform blocks to be left-to-right when neither the reference pixel value on the left side nor the reference pixel value on the right side of the current prediction block is available, and to determine the decoding order of the transform blocks to be one of a left-to-right decoding order, a right-to-left decoding order, and a decoding order of the transform blocks in the prediction block determined according to information about the decoding order of the transform blocks when both of the reference pixel value on the left side and
  • a computer-readable storage medium storing a computer program thereon, and when the computer program is executed by a processor, a method for coding and decoding according to the exemplary embodiment of the present disclosure is implemented.
  • a computing device including a processor and a storage storing a computer program, wherein when the computer program is executed by the processor, a method for coding and decoding according to the exemplary embodiment of the present disclosure is implemented.
  • the method and device for coding and decoding according to the exemplary embodiment of the present disclosure adopt a flexible coding order, expand the spatial reference information, and design Intra Prediction Filter (IPF) technology, Two Step Cross Component Prediction Mode (TSCPM) technology, and Derived Tree (DT) technology according to availabilities of adjacent reference pixel on the left side and the right side of the currently coding or decoding image block, which makes use of surrounding reference pixel information to the maximum extent so that the efficiency of intra coding is improved.
  • IPF Intra Prediction Filter
  • TCPM Two Step Cross Component Prediction Mode
  • DT Derived Tree
  • the pixels on the right side of the image block are available, for the IPF technology, the pixels on the right side and the pixels on the upper side are used as the filtering pixels, that is, new predicted values are obtained by applying weights to the pixels on the right side and the pixels on the upper side, and the predicted values.
  • the TSCPM technology a linear model of the luminance component and the chrominance component is derived by using the pixels on the right side and the pixels on the upper side, and the linear model is used to predict the chrominance component.
  • the prediction blocks and the transform blocks are encoded in a right-to-left order, so that when the right-to-left coding order is used, it is still possible to make use of the encoded or decoded pixel information of the surrounding image blocks to the maximum extent which improves the efficiency of intra prediction and thus improves the performance of video coding.
  • FIG. 4 illustrates a flowchart of a coding method according to one exemplary embodiment of the present disclosure.
  • the coding method in FIG. 4 may be applied to an encoder using the Intra Prediction Filter (IPF) technology.
  • IPF Intra Prediction Filter
  • step S401 intra prediction is performed on a current coding block based on availabilities of reference pixels of the current coding block.
  • all intra prediction modes may be traversed for the current coding block to obtain a prediction pixel value corresponding to each intra prediction mode, and intra prediction filtering may be performed on the prediction pixel value to obtain a final prediction pixel value corresponding to each intra prediction mode, then a rate distortion cost corresponding to each intra prediction mode may be calculated according to the final prediction pixel value, and then an intra prediction mode with the lowest rate distortion cost may be used as the intra prediction mode of the current coding block, according to the rate distortion cost of each intra prediction mode.
  • the intra prediction filtering in performing of the intra prediction filtering on the prediction pixel value, may be performed according to the intra prediction mode of the current coding block and a reference pixel value on the left side of the current coding block when the reference pixel value on the left side of the current coding block is available and a reference pixel value on the right side of the current coding block is not available.
  • the intra prediction filtering may be performed according to the intra prediction mode of the current coding block and the reference pixel value on the right side of the current coding block when the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available.
  • the intra prediction filtering may be performed according to the intra prediction mode of the current coding block, the reference pixel value on the left side of the current coding block and/or the reference pixel value on the right side of the current coding block when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • the reference pixel value on the left side or the reference pixel value on the right side may be padded so that the intra prediction filtering is performed according to a case in which the reference pixel value on the left side of the current coding block is not available the reference pixel value on the right side of the current coding block is available or a case in which the reference pixel value on the right side is available and the reference pixel value on the left side of the current coding block is not available, when neither the reference pixel value on the left side nor the reference pixel value on the right side of the current coding block is available.
  • the final prediction pixel value in performing of the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the right side of the current coding block, may be obtained by applying weights to the prediction pixel value on the upper side, the prediction pixel value on the right side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block when the intra prediction mode of the current coding block is not an angular prediction mode.
  • the final prediction pixel value may be calculated according to an angle between a prediction direction of the current coding block and the horizontal direction or the vertical direction when the intra prediction mode of the current coding block is the angular prediction mode.
  • the final prediction pixel value in calculating of the final prediction pixel value according to the angle between the prediction direction of the current coding block and the horizontal direction or the vertical direction, may be obtained by applying weights to the prediction pixel value on the upper side and the reference pixel value on the upper side of the current coding block when the angle between the prediction direction of the current coding block and the horizontal direction is less than a first angle, and the final prediction pixel value may be obtained by applying weights to the prediction pixel value on the right side and the reference pixel value on the right side of the current coding block when the angle between the prediction direction of the current coding block and the vertical direction is less than a second angle.
  • the intra prediction filtering in performing of the intra prediction filtering according to the intra prediction mode of the current coding block, the reference pixel value on the left side of the current coding block and/or the reference pixel value on the right side of the current coding block, the intra prediction filtering may be performed according to the intra prediction mode of the current coding block and the reference pixel value on the left side of the current coding block, or, the intra prediction filtering may be performed according to the intra prediction mode of the current coding block and the reference pixel value on the right side of the current coding block, or, the intra prediction filtering may be performed according to the intra prediction mode of the current coding block, the reference pixel value on the left side of the current coding block, and the reference pixel value on the right side of the current coding block, or, an intra filtering mode with the lowest rate distortion cost to perform intra prediction filtering may be selected from among a plurality of intra filtering modes; the intra filtering modes including a first intra filtering mode in which the intra prediction filtering may be performed according
  • the reference pixel value on the left side of the current coding block and the reference pixel value on the right side of the current coding block when the intra prediction mode of the current coding block is not the angular prediction mode, the final prediction pixel value on the upper left side of the current coding block may be obtained by applying weights to the prediction pixel value on the upper left side, the reference pixel value on the upper side and the reference pixel value on the left side of the current coding block.
  • the final prediction pixel value on the left side of the current coding block may be obtained by applying weights to the prediction pixel value on the left side, the reference pixel value on the upper side and the reference pixel value on the left side of the current coding block.
  • the final prediction pixel value on the upper right side of the current coding block may be obtained by applying weights to the prediction pixel value on the upper right side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block.
  • the final prediction pixel value on the right side of the current coding block may be obtained by applying weights to the prediction pixel value on the right side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block.
  • the intra prediction mode of the current coding block is the angular prediction mode
  • the final prediction pixel value on the upper side of the current coding block may be obtained by applying weights to the prediction pixel value on the upper side and the reference pixel value on the upper side of the current coding block when the angle between the prediction direction of the current coding block and the horizontal direction is less than a third angle.
  • the final prediction pixel value on the left side of the current coding block may be obtained by applying weights to the prediction pixel value on the left side and the reference pixel value on the left side of the current coding block and the final prediction pixel value on the right side of the current coding block may be obtained by applying weights to the prediction pixel value on the right side with the reference pixel value on the right side of the current coding block when the angle between the prediction direction of the current coding block and the vertical direction is less than a fourth angle.
  • the first angle to the fourth angle may be the same or may be different.
  • the information of intra prediction may further include information about the intra filtering mode of the current coding block when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • the encoder may firstly traverse all the intra prediction modes for the current coding block to obtain a prediction pixel value corresponding to each intra prediction mode, and perform intra prediction filtering on the prediction pixel value to obtain final prediction pixel value. Then the current encoded block may be transformed and quantized according to the final prediction pixel value to calculate a rate distortion cost corresponding to each intra prediction mode. Finally, an intra prediction mode with the lowest output distortion cost may be selected according to the rate distortion cost of each intra prediction mode.
  • FIG. 1 illustrates a schematic diagram of the reference pixels on the upper side (14) and the reference pixels on the left side (12) of the current coding block (10) in IPF technology.
  • FIG. 1 illustrates a schematic diagram of the reference pixels on the upper side (14) and the reference pixels on the left side (12) of the current coding block (10) in IPF technology.
  • PredMode intra prediction mode
  • the intra prediction mode of the current coding block (10) is not the angular prediction mode (for example, the prediction mode is a Direct Current mode (DC), a Planar mode (Planar), or a Bilinear mode (Bilinear), etc.)
  • a final prediction pixel value adjacent to the upper side (14) of the current coding block is obtained by applying weights to the prediction pixel value adjacent to the upper side (14) of the current coding block and the corresponding reference pixel value on the upper side (14) and the corresponding reference pixel value on the left side (12)
  • a final prediction pixel value adjacent to the left side (12) of the current coding block is obtained by applying weights to the prediction pixel value adjacent to the left side (12) of the current coding block and the corresponding reference pixel value on the upper side (14) and the corresponding reference pixel value on the left side (12).
  • the final prediction pixel value adjacent to the upper side (14) of the current coding block is obtained by applying weights to the prediction pixel value adjacent to the upper side (14) of the current coding block and the corresponding reference pixel value on the upper side (14).
  • the final prediction pixel value adjacent to the left side (12) of the current coding block is obtained by applying weights to the prediction pixel value adjacent to the left side (12) of the current coding block and the corresponding reference pixel value on the left side (12).
  • FIG. 5 illustrates a schematic diagram of the reference pixels on the upper side (52) and the reference pixels on the right side (54) of a current coding block (50) according to an exemplary embodiment of the present disclosure.
  • filtering is performed according to the intra prediction mode of the current coding block (50).
  • a final prediction pixel value adjacent to the upper side (52) of the current coding block (50) is obtained by applying weights to the prediction pixel value adjacent to the upper side (52) of the current coding block and the corresponding reference pixel value on the upper side (52) and the corresponding reference pixel value on the right side (54), and a final prediction pixel value adjacent to the right side (54) of the current coding block is obtained by applying weights to the prediction pixel value adjacent to the upper side (52) of the current coding block and the corresponding reference pixel value on the upper side (52) and the corresponding reference pixel value on the right side (54).
  • the intra prediction mode (59) of the current coding block (50) is the angular prediction mode and the angle between the prediction direction (59) of the current coding block and the horizontal direction is less than 45°
  • the final prediction pixel value adjacent to the upper side (52) of the current coding block is obtained by applying weights to the prediction pixel value adjacent to the upper side (52) of the current coding block and the corresponding reference pixel value on the upper side (52).
  • the final prediction pixel value adjacent to the right side (54) of the current coding block is obtained by applying weights to the prediction pixel value adjacent to the right side (54) of the current coding block and the corresponding reference pixel value on the right side (54).
  • one possible implementation method is to pad the reference pixel value on the left side (56), so that the intra prediction filtering is performed according to a case in which the reference pixel value on the left side (56) of the current coding block is available and the reference pixel value on the right side (54) of the current coding block is not available.
  • Another possible implementation method is to pad the reference pixel value on the right side (54), so that the intra prediction filtering is performed according to a case in which the reference pixel value on the left side (56) of the current coding block is not available and the reference pixel value on the right side (54) of the current coding block is available.
  • one possible method is to perform the intra prediction filtering according to the case in which the reference pixel value on the left side (64) of the current coding block (60) is available and the reference pixel value on the right side (66) of the current coding block (60) is not available.
  • Another possible method is to perform the intra prediction filtering according to a case in which the reference pixel value on the left side (64) of the current coding block (60) is not available and the reference pixel value on the right side (66) of the current coding block (60) is available.
  • a further possible method is for example as shown in FIG.
  • FIG. 6 which illustrates a schematic diagram of reference pixels on the upper side (62), reference pixels on the left side (64) and reference pixels on the right side (66) of the current coding block (60) according to an exemplary embodiment of the present disclosure.
  • the intra prediction mode of the current coding block (60) is not the angular prediction mode (for example, when the prediction mode is a mode such as DC, Planar, Bilinear, etc.)
  • a final prediction pixel value adjacent to the upper left side (62) of the current coding block is obtained by applying weights to the prediction pixel value adjacent to the upper left side (64) of the current coding block and the corresponding reference pixel value on the upper side (62) and the corresponding reference pixel value on the left side (66)
  • a final prediction pixel value adjacent to the left side (64) of the current coding block is obtained by applying weights to the prediction pixel value adjacent to the left side (64) of the current coding block and the corresponding reference pixel value on the upper side (62) and the corresponding reference pixel value
  • the intra prediction mode of the current coding block is the angular prediction mode, and the angle between the prediction direction (69) of the current coding block and the horizontal direction is less than 45°
  • the final prediction pixel value adjacent to the upper side (62) of the current coding block is obtained by applying weights to the prediction pixel value adjacent to the upper side (62) of the current coding block and the corresponding reference pixel value on the upper side (62).
  • the final prediction pixel value adjacent to the left side (64) of the current coding block is obtained by applying weights to the prediction pixel value adjacent to the left side (64) of the current coding block and the corresponding reference pixel value on the left side (64), the final prediction pixel value adjacent to the right side (66) of the current coding block is obtained by applying weights to the prediction pixel value adjacent to the right side (66) of the current coding block and the corresponding reference pixel value on the right side (66).
  • One possible method is to traverse the intra filtering modes in the above three methods, and select an intra filtering mode with the lowest rate distortion cost for intra filtering.
  • information of the selected intra filtering mode needs to be written into the bitstream.
  • the information of the intra filtering mode may be an index value of filtering mode, which is not limited here.
  • step S402 information of intra prediction may be written into a bitstream, wherein the information of intra prediction at least includes information about an intra prediction mode of the current coding block.
  • one possible method is to write the intra prediction mode into the bitstream according to the prior art, and another possible method is to firstly write the intra prediction mode into the bitstream according to the prior art, and write filtering mode information into the bitstream when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • FIG. 7 illustrates a flowchart of a decoding method according to an exemplary embodiment of the present disclosure.
  • the decoding method in FIG. 7 may be applied to a decoder using the Intra Prediction Filter (IPF) technology.
  • IPF Intra Prediction Filter
  • step S701 information of intra prediction may be parsed from a bitstream, wherein the information of intra prediction at least includes information about an intra prediction mode of a current coding block.
  • the information of intra prediction may further includes information about the intra filtering mode of the current coding block when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • one possible method is to parse information of intra prediction from a bitstream according to the prior art
  • another possible method is to firstly parse information of intra prediction from the bitstream according to the prior art, obtain reference pixel information of current coding, and then parse the information of intra prediction when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • a prediction pixel value of the current coding block may be calculated according to the parsed information of intra prediction, based on availabilities of reference pixels of the current coding block.
  • the intra prediction filtering in calculating of a prediction pixel value of the current coding block, may be performed according to the intra prediction mode of the current coding block and the reference pixel value on the left side of the current coding block when the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available.
  • the intra prediction filtering may be performed according to the intra prediction mode of the current coding block and the reference pixel value on the right side of the current coding block when the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available.
  • the intra prediction filtering may be performed according to the intra prediction mode of the current coding block, the reference pixel value on the left side of the current coding block and/or the reference pixel value on the right side of the current coding block when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • the reference pixel value on the left side or the reference pixel value on the right side may be padded, so that the intra prediction filtering may be performed according to a case in which the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available or a case in which the reference pixel value on the right side is available and the reference pixel value on the left side of the current coding block is not available, when neither the reference pixel value on the left side nor the reference pixel value on the right side of the current coding block is available.
  • the final prediction pixel value on the upper side of the current coding block may be obtained by applying weights to the prediction pixel value on the upper side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block and the final prediction pixel value on the right side of the current coding block may be obtained by applying weights to the prediction pixel value on the right side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block.
  • the final prediction pixel value may be calculated according to an angle between the prediction direction of the current coding block and the horizontal direction or the vertical direction when the intra prediction mode of the current coding block is the angular prediction mode.
  • the final prediction pixel value on the upper side of the current coding block may be obtained by applying weights to the prediction pixel value on the upper side and the reference pixel value on the upper side of the current coding block when the angle between the prediction direction of the current coding block and the horizontal direction is less than a first angle.
  • the final prediction pixel value on the right side of the current coding block may be obtained by applying weights to the prediction pixel value on the right side and the reference pixel value on the right side of the current coding block when the angle between the prediction direction of the current coding block and the vertical direction is less than a second angle.
  • the intra prediction filtering in performing of the intra prediction filtering according to the intra prediction mode of the current coding block, the reference pixel value on the left side of the current coding block and/or the reference pixel value on the right side of the current coding block, the intra prediction filtering may be performed according to the intra prediction mode of the current coding block and the reference pixel value on the left side of the current coding block, or, the intra prediction filtering may be performed according to the intra prediction mode of the current coding block and the reference pixel value on the right side of the current coding block, or, the intra prediction filtering may be performed according to the intra prediction mode of the current coding block, the reference pixel value on the left side of the current coding block, and the reference pixel value on the right side of the current coding block, or, the intra prediction filtering may be performed according to the parsed intra prediction mode.
  • the final prediction pixel value on the upper left side of the current coding block may be obtained by applying weights to the prediction pixel value on the upper left side, the reference pixel value on the left side and the reference pixel value on the upper side of the current coding block, the final prediction pixel value on the left side of the current coding block may be obtained by applying weights to the prediction pixel value on the left side, the reference pixel value on the left side and the reference pixel value on the upper side of the current coding block, the final prediction pixel value on the upper right side of the current coding block may be obtained by applying weights to the prediction pixel value on the upper right side, the reference pixel value on the upper side and the reference pixel
  • the intra prediction mode of the current coding block is the angular prediction mode
  • the final prediction pixel value on the upper side of the current coding block may be obtained by applying weights to the prediction pixel value on the upper side and the reference pixel value on the upper side of the current coding block, .
  • the final prediction pixel value on the left side of the current coding block may be obtained by applying weights to the prediction pixel value on the left side and the reference pixel value on the left side of the current coding block
  • the final prediction pixel value on the right side of the current coding block may be obtained by applying weights to the prediction pixel value on the right side and the reference pixel value on the right side of the current coding block.
  • a decoder may perform filtering according to the intra prediction modes of the current coding block. That is, when the intra prediction mode of the current coding block is not the angular prediction mode (for example, the prediction mode is a Direct Current mode (DC), a Planar mode (Planar), or a Bilinear mode (Bilinear), etc.), a final prediction pixel value adjacent to the upper side of the current coding block may be obtained by applying weights to the prediction pixel value adjacent to the upper side of the current coding block and the corresponding reference pixel value on the upper side and the corresponding reference pixel value on the left side, and a final prediction pixel value adjacent to the left side of the current coding block may be obtained by applying weights to the prediction pixel value adjacent to the left side of the current coding block and the corresponding reference pixel value on the upper side and the corresponding reference pixel value on the left side.
  • DC Direct Current mode
  • Planar Planar
  • Bilinear Bilinear
  • the final prediction pixel value adjacent to the upper side of the current coding block may be obtained by applying weights to the prediction pixel value adjacent to the upper side of the current coding block and the corresponding reference pixel value on the upper side.
  • a final prediction pixel value adjacent to the left side of the current coding block may be obtained by applying weights to the prediction pixel value adjacent to the left side of the current coding block and the corresponding reference pixel value on the left side.
  • the filtering may be performed according to the intra prediction mode of the current coding block.
  • the intra prediction mode of the current coding block is not the angular prediction mode (for example, when the prediction mode is a mode such as DC, Planar, Bilinear, etc.)
  • a final prediction pixel value adjacent to the upper side of the current coding block may be obtained by applying weights to the prediction pixel value adjacent to the upper side of the current coding block and the corresponding reference pixel value on the upper side and the corresponding reference pixel value on the right side
  • a final prediction pixel value adjacent to the right side of the current coding block may be obtained by applying weights to the prediction pixel value adjacent to the upper side of the current coding block and the corresponding reference pixel value on the upper side and the corresponding reference pixel value on the right side.
  • a final prediction pixel value adjacent to the upper side of the current coding block may be obtained by applying weights to the prediction pixel value adjacent to the upper side of the current coding block and the corresponding reference pixel value on the upper side.
  • a final prediction pixel value adjacent to the right side of the current coding block may be obtained by applying weights to the prediction pixel value adjacent to the right side of the current coding block and the corresponding reference pixel value on the right side.
  • one possible implementation method is to pad the reference pixel value on the left side, so that the intra prediction filtering is performed according to a case in which the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available.
  • Another possible implementation method is to pad the reference pixel value on the right side, so that the intra prediction filtering is performed according to a case in which the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available.
  • one possible method is to perform the intra prediction filtering according to the case in which the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available.
  • Another possible method is to perform the intra prediction filtering according to a case in which the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available.
  • a further possible method is for example as shown in FIG.
  • a final prediction pixel value adjacent to the upper left side of the current coding block may be obtained by applying weights to the prediction pixel value adjacent to the upper left side of the current coding block and the corresponding reference pixel value on the upper side and the corresponding reference pixel value on the left side
  • a final prediction pixel value adjacent to the left side of the current coding block may be obtained by applying weights to the prediction pixel value adjacent to the left side of the current coding block and the corresponding reference pixel value on the upper side and the corresponding reference pixel value on the left side
  • a final prediction pixel value adjacent to the upper right side of the current coding block may be obtained by applying weights to the prediction pixel value adjacent to the upper right side of the current coding block and the corresponding reference pixel value on the upper side and the corresponding reference pixel value on the right side
  • a final prediction pixel value adjacent to the upper right side of the current coding block may be obtained by applying weights to the prediction pixel value adjacent to the upper right side of the current coding block and the
  • a final prediction pixel value adjacent to the upper side of the current coding block may be obtained by applying weights to the prediction pixel value adjacent to the upper side of the current coding block and the corresponding reference pixel value on the upper side.
  • a final prediction pixel value adjacent to the left side of the current coding block may be obtained by applying weights to the prediction pixel value adjacent to the left side of the current coding block and the corresponding reference pixel value on the left side.
  • Another possible method is to perform intra filtering on the current coding block according to the filtering mode corresponding to the filtering mode information obtained in step S702, to obtain the final prediction pixel value.
  • a decoded image may be obtained by reconstructing the image according to the prediction pixel value.
  • the decoder may reconstruct the image according to the final prediction pixel values to obtain a final decoded image.
  • FIG. 8 illustrates a flowchart of a coding method according to another exemplary embodiment of the present disclosure.
  • the coding method in FIG. 8 may be applied to an encoder using the Two Step Cross Component Prediction Mode (TSCPM) technology.
  • TCPM Two Step Cross Component Prediction Mode
  • reference samples for constructing a linear model may be determined based on availabilities of reference pixels of a current coding block, and constructing the linear model based on the determined reference samples.
  • two reference samples may be selected from the reference pixels on the upper side and the reference pixels on the left side, respectively, when the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available.
  • two reference samples may be selected from the reference pixels on the upper side and the reference pixels on the right side, respectively.
  • reference samples may be selected according to the case in which the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available, or, reference samples are selected according to the case in which the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available, or, reference samples are selected according to a case in which the rate distortion cost is small in the above two cases.
  • the information of the intra prediction may further include information about reference pixel construction, when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • FIG. 2 illustrates a schematic diagram of finding two reference samples from reference pixels on the left side and the top side of the current block in TSCPM technology.
  • two reference samples including a chrominance component and a luminance component
  • the reference pixels (28) on the upper side and the reference pixels (24) on the left side may be selected from the reference pixels (28) on the upper side and the reference pixels (24) on the left side, respectively.
  • the first position of the two reference pixels (28) on the upper side is 2, i.e., the second reference sample of the reference pixels (26) on the upper side
  • the first position of the two reference pixels on the left side (24) is 2, i.e., the second reference sample of the reference pixels (22) on the left side.
  • a width of a current coding block (20) is greater than or equal to a height of the current coding block (20)
  • the second position of the two reference pixels (28) on the upper side is width-width/height+2
  • the second position of the two reference pixels (24) on the left side is height
  • the second position of the two reference pixels (28) on the upper side is width
  • the second position of the two reference pixels (24) on the left side is height-height/width+2.
  • FIG. 9 illustrates a schematic diagram of reference samples in TSCPM technology according to an exemplary embodiment of the present disclosure.
  • two reference samples (98, 94) are selected from the reference pixels (96) on the upper side and the reference pixels (92) on the right side, respectively.
  • the first position of the two reference pixels (98) on the upper side is Width-1
  • the first position of the two reference pixels (94) on the right side is 2, i.e., the second reference sample of the reference pixels (92) on the right side.
  • the second position of the two reference pixels (98) on the upper side is width/height-2, and the second position of the two reference pixels (94) on the left side is height; otherwise, the second position of the two reference pixels (98) on the upper side is 1, i.e., the first reference sample of the reference pixels (96) on the upper side, and the second position of the two reference pixels (98) on the right side is height-height/width+2.
  • one possible method is to acquire reference samples according to the case in which the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available.
  • Another possible method is to acquire reference samples according to the case in which the reference pixel value on the right side is available and the reference pixel value on the left side of the current coding block is not available.
  • a further possible method is to traverse the case in which the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available, and the case in which the reference pixel value on the left side is not available and the reference pixel value on the right side of the current coding block is available, so that the case with the small rate distortion cost is selected as the optimal case according to the rate distortion cost, and the reference sample construction information in this case is written into the bitstream.
  • the predChroma is the prediction pixel value of the chrominance component and the recLuma is the reconstructed value of the luminance component.
  • a prediction pixel value of a chrominance component of the current coding block may be calculated according to the constructed linear model, and determining an intra prediction mode of the current coding block.
  • the information of the intra prediction may be written into a bitstream, wherein the information of the intra prediction at least includes information about whether the intra prediction mode of the current coding block is a Two Step Cross Component Prediction Mode (TSCPM) mode.
  • TCPM Two Step Cross Component Prediction Mode
  • one possible method is to write the identification of whether it is TSCPM mode into the bitstream.
  • Another possible method is to write the identification of whether it is TSCPM mode into the bitstream, and write the reference sample construction information into the bitstream when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • FIG. 10 illustrates a flowchart of a decoding method according to another exemplary embodiment of the present disclosure.
  • the decoding method in FIG. 10 may be applied to a decoder using the Two Step Cross Component Prediction Mode (TSCPM) technology.
  • TCPM Two Step Cross Component Prediction Mode
  • step S1001 information of intra prediction may be parsed from a bitstream, wherein the information of intra prediction at least includes information about whether the intra prediction mode of a current coding block is TSCPM mode.
  • the information of the intra prediction may further include information about the reference pixel construction, when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • one possible method is to parse the prediction mode from the bitstream, and if the prediction mode is identified as the TSCPM mode, the TSCPM may be used to predict the chrominance component, otherwise the intra prediction may be performed according to the prior art.
  • Another possible method is to parse the prediction mode from the bitstream, and if the prediction mode is identified as the TSCPM mode, the TSCPM may be used to predict the chrominance component, otherwise the intra prediction may be performed according to the prior art. If the TSCPM is used to predict the chrominance component, when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available, the reference sample construction information may be then parsed from the bitstream.
  • reference samples for constructing a linear model may be determined based on availabilities of reference pixels of the current coding block, and the linear model may be constructed based on the determined reference samples.
  • two reference samples may be selected from the reference pixels on the upper side and the reference pixels on the left side, respectively, when the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available.
  • two reference samples may be selected from the reference pixels on the upper side and the reference pixels on the right side, respectively.
  • reference samples may be selected according to the case in which the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available. Or, reference samples may be selected according to the case in which the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available. Or, reference samples may be selected according to a case in which the rate distortion cost is small in the above two cases.
  • two reference samples may be selected from the reference pixels on the upper side and the reference pixels on the left side, respectively.
  • the first position of the reference pixels on the upper side is 2, i.e., the second reference sample of the reference pixels on the upper side.
  • the first position of the reference pixels on the left side is 2, i.e., the second reference sample of the reference pixels on the left side.
  • the second position of the reference pixels on the upper side is width-width/height+2, and the second position of the reference pixels on the left side is height, otherwise, the second position of the reference pixels on the upper side is width, and the second position of the reference pixels on the left side is height-height/width+2.
  • two reference samples may be selected from the reference pixels on the upper side and the reference pixels on the right side, respectively.
  • the first position of the reference pixels on the upper side is width-1
  • the first position of the reference pixels on the right side is 2, i.e., the second reference sample of the reference pixels on the left side.
  • the second position of the reference pixels on the upper side is width/height-2, and the second position of the reference pixels on the left side is height; otherwise, the second position of the reference pixels on the upper side is 1, i.e., the first reference sample of the reference pixels on the upper side, and the second position of the reference pixels on the right side is height-height/width+2.
  • one possible method is to acquire reference samples according to the case in which the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available.
  • Another possible method is to acquire reference samples according to the case in which the reference pixel value on the right side is available and the reference pixel value on the left side of the current coding block is not available.
  • a further possible method is to select, according to the parsed reference sample and construction information based on the analysis of points in the bitstream, i.e., the reference pixels on which side are used, one case from two cases of a case in which both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available and a case in which neither the reference pixel value on the left side nor the reference pixel value on the right side of the current coding block is available, to obtain the reference samples.
  • the predChroma is the prediction pixel value of the chrominance component and the recLuma is the reconstructed value of the luminance component.
  • a prediction pixel value of a chrominance component of the current coding block may be calculated according to the constructed linear model.
  • a decoded image may be obtained by reconstructing the chrominance component of the current coding block according to the prediction pixel value of the chrominance component of the current coding block.
  • FIG. 11 illustrates a flowchart of a coding method according to another exemplary embodiment of the present disclosure.
  • the coding method in FIG. 11 may be applied to an encoder using the Derived Tree (DT) technology.
  • DT Derived Tree
  • a coding order of prediction blocks in a current coding block may be determined based on a block partitioning mode and availabilities of reference pixels of the current coding block.
  • the coding order of the prediction blocks when the block partitioning mode is vertical partitioning, in determining of the coding order of prediction blocks in the current coding block, the coding order of the prediction blocks may be determined to be left-to-right when the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available.
  • the coding order of the prediction blocks may be determined to be right-to-left when the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available.
  • the coding order of the prediction blocks may be determined to be left-to-right when neither the reference pixel value on the left side nor the reference pixel value on the right side of the current coding block is available. And when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available, the coding order of the prediction blocks may be determined to be one of a left-to-right coding order, a right-to-left coding order, and a coding order with a lower rate distortion cost of the left-to-right coding order and the right-to-left coding order.
  • FIG. 12 illustrates a coding order of prediction blocks according to an exemplary embodiment of the present disclosure.
  • the reference pixel value (1210) on the left side of the current coding block (1200) is available and the reference pixel value (1220) on the right side is not available
  • the coding of the prediction blocks (1250, 1260) is performed in the left-to-right order.
  • FIG. 13 illustrates a coding order of prediction blocks according to another exemplary embodiment of the present disclosure. As shown in FIG.
  • FIG. 14 illustrates a coding order of prediction blocks according to another exemplary embodiment of the present disclosure. As shown in FIG. 14, when neither the reference pixel value (1410) on the left side nor the reference pixel value (1420) on the right side of the current coding block (1400) is available, when the current coding block (1400) is vertically partitioned, the coding of the prediction blocks (1450, 1460) is performed in the left-to-right order.
  • one possible implementation method is that, when the current coding block is vertically partitioned, the coding of the prediction blocks may be performed in the left-to-right order. Another possible implementation method is that, when the current coding block is vertically partitioned, the coding of the prediction blocks may be performed in the left-to-right order.
  • a further possible implementation method is to compare the rate-distortion costs of left-to-right order and right-to-left order, so that the prediction blocks' coding order with the lowest rate distortion cost is selected, and then the identification of the prediction blocks' coding order corresponding to this prediction block coding order may be determined.
  • a coding order of transform blocks in a prediction block for each prediction block of the current coding block may be determined based on the block partitioning mode and the availabilities of the reference pixels of the current coding block.
  • the coding order of the transform blocks when the block partitioning mode is vertical partitioning, in determining of the coding order of transform blocks in the prediction block, the coding order of the transform blocks may be determined to be left-to-right when the reference pixel value on the left side of a current prediction block is available and the reference pixel value on the right side of the current prediction block is not available.
  • the coding order of the transform blocks may be determined to be right-to-left when the reference pixel value on the left side of the current prediction block is not available and the reference pixel value on the right side of the current coding block is available.
  • the coding order of the transform blocks may be determined to be left-to-right when neither the reference pixel value on the left side nor the reference pixel value on the right side of the current prediction block is available. And when both of the reference pixel value on the left side and the reference pixel value on the right side of the current prediction block are available, the coding order of the transform blocks may be determined to be one of a left-to-right coding order, a right-to-left coding order, and a coding order with a lower rate distortion cost of the left-to-right coding order and the right-to-left coding order.
  • FIG. 15 illustrates a coding order of transform blocks in a prediction block according to another exemplary embodiment of the present disclosure.
  • the coding of the transform blocks (1550, 1560, 1570) is performed in the left-to-right order.
  • FIG. 16 illustrates a coding order of the transform blocks in a prediction block according to another exemplary embodiment of the present disclosure. As shown in FIG.
  • FIG. 17 illustrates a coding order of transform blocks in a prediction block according to another exemplary embodiment of the present disclosure. As shown in FIG.
  • one possible implementation method is that, when the current prediction block is partitioned vertically, the coding of the transform blocks is performed in the left-to-right order.
  • Another possible implementation method is that, when the current prediction block is partitioned vertically, the coding of the transform blocks is performed in the left-to-right order.
  • a further possible implementation method is to traverse the above two coding orders to select a coding order with the lowest rate distortion cost, and then the identification of the coding order of the prediction blocks corresponding to the transform block coding order may be determined.
  • Derived Tree (DT) mode information may be written into a bitstream, based on the determined coding order of the prediction blocks in the current coding block and the determined coding order of the transform blocks in the prediction block.
  • the DT mode information at least includes information about the block partitioning mode of the current coding block.
  • the DT mode information may further include information about the coding order of the prediction blocks in the current coding block and/or information about the coding order of the transform blocks in each prediction block of the current coding block, when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • one possible implementation method is to write the partitioning mode used by the DT into the bitstream.
  • Another possible implementation method is to write the partitioning mode used by the DT into the bitstream, and when both of the reference pixel value on the left side and the reference pixel value on the right side of the prediction block are available, the identification of the coding order of prediction blocks is written into the bitstream, and when both of the reference pixel value on the left side and the reference pixel value on the right side of the transform block are available, the identification of coding order of the transform blocks is written into the bitstream.
  • FIG. 18 illustrates a flowchart of a decoding method according to another exemplary embodiment of the present disclosure.
  • the decoding method in FIG. 18 may be applied to a decoder using the Derived Tree (DT) technology.
  • DT Derived Tree
  • DT mode information may be parsed from a bitstream, wherein the DT mode information at least includes information about a block partitioning mode of a current coding block.
  • the DT mode information may further include information about the decoding order of the prediction blocks in the current coding block and/or information about the decoding order of the transform blocks in each prediction block of the current coding block.
  • one possible implementation method is to parse the division mode adopted by DT from the bitstream.
  • Another possible implementation method is to parse the partition mode adopted by DT from the bitstream, and when both of the reference pixel value on the left side and the reference pixel value on the right side of the prediction block are available, an identification of the decoding order of prediction blocks may be parsed from the bitstream, and when both of the reference pixel value on the left side and the reference pixel value on the right side of the transform block are available, an identification of the decoding order the transform block may be parsed from the bitstream.
  • a decoding order of prediction blocks in the current coding block may be determined based on the block partitioning mode and availabilities of reference pixels of the current coding block.
  • the decoding order of the prediction blocks when the block partitioning mode is vertical partitioning, in determining of the decoding order of prediction blocks in the current coding block, the decoding order of the prediction blocks may be determined to be left-to-right when the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available.
  • the decoding order of the prediction blocks may be determined to be right-to-left when the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available.
  • the decoding order of the prediction blocks may be determined to be left-to-right when neither the reference pixel value on the left side nor the reference pixel value on the right side of the current coding block is available. And when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available, the decoding order of the prediction blocks may be determined to be one of a left-to-right decoding order, a right-to-left decoding order, and an decoding order with a lower rate distortion cost of the left-to-right decoding order and the right-to-left decoding order.
  • the decoding of the prediction blocks may be performed in the left-to-right order.
  • the decoding of the prediction blocks may be performed in the right-to-left order.
  • the decoding of the prediction blocks may be performed in the left-to-right order.
  • the decoding of the prediction blocks is performed in the left-to-right order.
  • Another possible implementation method is that, when the current coding block is partitioned vertically, the decoding of the prediction blocks is performed in the left-to-right order.
  • a further possible implementation method is to compare the rate-distortion costs of left-to-right order and right-to-left order, so that the decoding order of prediction blocks with the lowest rate distortion cost may be selected, and then an identification of the decoding order of the prediction blocks corresponding to the decoding order of the prediction blocks may be determined.
  • a decoding order of transform blocks in a prediction block may be determined based on the block partitioning mode and the availabilities of the reference pixels of the current coding block.
  • the decoding of order of the transform blocks when the block partitioning mode is vertical partitioning, in determining of the decoding order of transform blocks in a prediction block, the decoding of order of the transform blocks may be determined to be left-to-right when the reference pixel value on the left side of a current prediction block is available and the reference pixel value on the right side of the current prediction block is not available.
  • the decoding order of the transform blocks may be determined to be right-to-left when the reference pixel value on the left side of the current prediction block is not available and the reference pixel value on the right side of the current prediction block is available.
  • the decoding order of the transform blocks may be determined to be left-to-right when neither the reference pixel value on the left side nor the reference pixel value on the right side of the current prediction block is available. And when both of the reference pixel value on the left side and the reference pixel value on the right side of the current prediction block are available, the decoding order of the transform blocks may be determined to be one of a left-to-right decoding order, a right-to-left decoding order, and a coding order with a lower rate distortion cost of the left-to-right decoding order and the right-to-left decoding order.
  • the decoding of the transform blocks may be performed in the left-to-right order.
  • the decoding of the transform blocks may be performed in the right-to-left order.
  • the decoding of the transform blocks may be performed in the left-to-right order.
  • one possible implementation method is that, when the current prediction block is partitioned vertically, the decoding of the transform blocks is performed in the left-to-right order.
  • Another possible implementation method is that, when the current prediction block is partitioned vertically, the decoding of the transform blocks is performed in the left-to-right order.
  • a further possible implementation method is to select a decoding order of left-to-right or right-to-left according to the identification of decoding order of the transform blocks.
  • step S1804 the decoding may be performed according to the determined decoding order of the prediction blocks in the current coding block and the determined decoding order of the transform blocks in the prediction block.
  • FIG. 19 illustrates a block diagram of a coding device according to an exemplary embodiment of the present disclosure.
  • the coding device includes an intra prediction unit 191 and an information writing unit 192.
  • the intra prediction unit 191 is configured to perform intra prediction on a current coding block based on availabilities of reference pixels of the current coding block.
  • the intra prediction unit 191 may be configured to traverse all intra prediction modes for the current coding block to obtain a prediction pixel value corresponding to each intra prediction mode and to perform intra prediction filtering on the prediction pixel value to obtain a final prediction pixel value corresponding to each intra prediction mode, to calculate a rate distortion cost corresponding to each intra prediction mode according to the final prediction pixel value, and to use an intra prediction mode with the lowest rate distortion cost as the intra prediction mode of the current coding block according to the rate distortion cost of each intra prediction mode.
  • the intra prediction unit 191 may be further configured to perform the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the left side of the current coding block when the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available.
  • the intra prediction unit 191 may be further configured to perform the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the right side of the current coding block when the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available.
  • the intra prediction unit 191 may be further configured to perform the intra prediction filtering according to the intra prediction mode of the current coding block, the reference pixel value on the left side of the current coding block and/or the reference pixel value on the right side of the current coding block when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • the intra prediction unit 191 may be further configured to pad the reference pixel value on the left side or the reference pixel value on the right side and to perform the intra prediction filtering according to a case in which the reference pixel value on the left side of the current coding block is not available the reference pixel value on the right side of the current coding block is available or a case in which the reference pixel value on the right side is available and the reference pixel value on the left side of the current coding block is not available when neither the reference pixel value on the left side nor the reference pixel value on the right side of the current coding block is available.
  • the intra prediction unit 191 may be further configured to obtain the final prediction pixel value by applying weights to the prediction pixel value on the upper side, the prediction pixel value on the right side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block when the intra prediction mode of the current coding block is not an angular prediction mode.
  • the intra prediction unit 191 may be configured to calculate the final prediction pixel value according to an angle between the prediction direction of the current coding block and the horizontal direction or the vertical direction when the intra prediction mode of the current coding block is the angular prediction mode.
  • the intra prediction unit 191 may be further configured to obtain the final prediction pixel value by applying weights to the prediction pixel value on the upper side and the reference pixel value on the upper side of the current coding block when the angle between the prediction direction of the current coding block and the horizontal direction is less than a first angle.
  • the intra prediction unit 191 may be configured to obtain the final prediction pixel value by applying weights to the prediction pixel value on the right side and the reference pixel value on the right side of the current coding block when the angle between the prediction direction of the current coding block and the vertical direction is less than a second angle.
  • the intra prediction unit 191 may be further configured to perform the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the left side of the current coding block. Or, the intra prediction unit 191 may be configured to perform the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the right side of the current coding block. Or, the intra prediction unit 191 may be configured to perform the intra prediction filtering according to the intra prediction mode of the current coding block, the reference pixel value on the left side of the current coding block, and the reference pixel value on the right side of the current coding block.
  • the intra prediction unit 191 may be configured to select an intra filtering mode with the lowest rate distortion cost to perform intra prediction filtering from among the intra filtering modes of an intra filtering mode in which the intra prediction filtering is performed according to the intra prediction mode of the current coding block and the reference pixel value on the left side of the current coding block, an intra filtering mode in which the intra prediction filtering is performed according to the intra prediction mode of the current coding block and the reference pixel value on the right side of the current coding block, an intra filtering mode in which the intra prediction filtering is performed according to the intra prediction mode of the current coding block, the reference pixel value on the left side and the reference pixel value on the right side of the current coding block.
  • the intra prediction unit 191 may be further configured to obtain the final prediction pixel value on the upper left side of the current coding block by applying weights to the prediction pixel value on the upper left side, the reference pixel value on the upper side and the reference pixel value on the left side of the current coding block.
  • the intra prediction unit 191 may be configured to obtain the final prediction pixel value on the left side of the current coding block by applying weights to the prediction pixel value on the left side, the reference pixel value on the upper side and the reference pixel value on the left side of the current coding block.
  • the intra prediction unit 191 may be configured to obtain the final prediction pixel value on the upper right side of the current coding block by applying weights to the prediction pixel value on the upper right side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block.
  • the intra prediction unit 191 may be configured to obtain the final prediction pixel value on the right side of the current coding block by applying weights to the prediction pixel value on the right side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block,
  • the intra prediction unit 191 may be configured to confirm whether the angle between the prediction direction of the current coding block and the horizontal direction or the vertical direction is less than a preset angle when the intra prediction mode of the current coding block is the angular prediction mode.
  • the intra prediction unit 191 may be configured to obtain the final prediction pixel value on the upper side of the current coding block by applying weights to the prediction pixel value on the upper side and the reference pixel value on the upper side of the current coding block when the angle between the prediction direction of the current coding block and the horizontal direction is less than a third angle.
  • the intra prediction unit 191 may be configured to obtain the final prediction pixel value on the left side of the current coding block by applying weights to the prediction pixel value on the left side and the reference pixel value on the left side of the current coding block and to obtain the final prediction pixel value on the right side of the current coding block by applying weights to the prediction pixel value on the right side and the reference pixel value on the right side of the current coding block when the angle between the prediction direction of the current coding block and the vertical direction is less than a fourth angle.
  • the information writing unit 192 is configured to write information of intra prediction into a bitstream, wherein the information of intra prediction at least includes information about an intra prediction mode of the current coding block.
  • the information of intra prediction may further include information about the intra filtering mode of the current coding block, when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • FIG. 20 illustrates a block diagram of a decoding device according to an exemplary embodiment of the present disclosure.
  • the decoding device includes a prediction mode parsing unit 201, a pixel value prediction unit 202, and an image reconstruction unit 203.
  • the prediction mode parsing unit 201 is configured to parse information of intra prediction from a bitstream, wherein the information of intra prediction at least includes information about an intra prediction mode of a current coding block.
  • the information of intra prediction may further include information about the intra filtering mode of the current coding block, when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • the pixel value prediction unit 202 is configured to calculate a prediction pixel value of a current coding block according to the parsed information of intra prediction, based on availabilities of reference pixels of the current coding block.
  • the pixel value prediction unit 202 may be further configured to perform the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the left side of the current coding block when the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available.
  • the pixel value prediction unit 202 may be configured to perform the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the right side of the current coding block when the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available.
  • the pixel value prediction unit 202 may be configured to perform the intra prediction filtering according to the intra prediction mode of the current coding block, the reference pixel value on the left side of the current coding block and/or the reference pixel value on the right side of the current coding block when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • the pixel value prediction unit 202 may be configured to pad the reference pixel value on the left side or the reference pixel value on the right side and then to perform the intra prediction filtering according to a case in which the reference pixel value on the left side of the current coding block is not available the reference pixel value on the right side of the current coding block is available or a case in which the reference pixel value on the right side is available and the reference pixel value on the left side of the current coding block is not available, when neither the reference pixel value on the left side nor the reference pixel value on the right side of the current coding block is available.
  • the pixel value prediction unit 202 may be further configured to obtain the final prediction pixel value on the upper side of the current coding block by applying weights to the prediction pixel value on the upper side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block and to obtain the final prediction pixel value on the right side of the current coding block by applying weights to the prediction pixel value on the right side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block, when the intra prediction mode of the current coding block is not the angular prediction mode.
  • the pixel value prediction unit 202 may be configured to calculate the final prediction pixel value according to an angle between the prediction direction of the current coding block and the horizontal direction or the vertical direction, when the intra prediction mode of the current coding block is the angular prediction mode.
  • the pixel value prediction unit 202 may be further configured to obtain the final prediction pixel value on the upper side of the current coding block by applying weights to the prediction pixel value on the upper side and the reference pixel value on the upper side of the current coding block, when the angle between the prediction direction of the current coding block and the horizontal direction is less than a first angle.
  • the pixel value prediction unit 202 may be configured to obtain the final prediction pixel value on the right side of the current coding block by applying weights to the prediction pixel value on the right side and the reference pixel value on the right side of the current coding block, when the angle between the prediction direction of the current coding block and the vertical direction is less than a second angle.
  • the pixel value prediction unit 202 may be further configured to perform the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the left side of the current coding block.
  • the pixel value prediction unit 202 may be configured to perform the intra prediction filtering according to the intra prediction mode of the current coding block and the reference pixel value on the right side of the current coding block.
  • the pixel value prediction unit 202 may be configured to perform the intra prediction filtering according to the intra prediction mode of the current coding block, the reference pixel value on the left side of the current coding block, and the reference pixel value on the right side of the current coding block.
  • the pixel value prediction unit 202 may be configured to perform the intra prediction filtering according to the parsed intra prediction mode.
  • the pixel value prediction unit 202 may be further configured to obtain the final prediction pixel value on the upper left side of the current coding block by applying weights to the prediction pixel value on the upper left side, the reference pixel value on the left side and the reference pixel value on the upper side of the current coding block, to obtain the final prediction pixel value on the left side of the current coding block by applying weights to the prediction pixel value on the left side, the reference pixel value on the left side and the reference pixel value on the upper side of the current coding block, to obtain the final prediction pixel value on the upper right side of the current coding block by applying weights to the prediction pixel value on the upper right side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block, and to obtain the final prediction pixel value on the right side of the current coding block by applying weights to the prediction pixel value on the right side, the reference pixel value on the upper side and the reference pixel value on the right side of the current coding block, and
  • the pixel value prediction unit 202 may be configured to confirm whether the angle between the prediction direction of the current coding block and the horizontal direction or the vertical direction is less than a preset angle, when the intra prediction mode of the current coding block is the angular prediction mode.
  • the pixel value prediction unit 202 may be configured to obtain the final prediction pixel value on the upper side of the current coding block by applying weights to the prediction pixel value on the upper side and the reference pixel value on the upper side of the current coding block, when the angle between the prediction direction of the current coding block and the horizontal direction is less than a third angle.
  • the pixel value prediction unit 202 may be configured to obtain the final prediction pixel value on the left side of the current coding block by applying weights to the prediction pixel value on the left side and the reference pixel value on the left side of the current coding block and to obtain the final prediction pixel value on the right side of the current coding block by applying weights to the prediction pixel value on the right side with the reference pixel value on the right side of the current coding block, when the angle between the prediction direction of the current coding block and the vertical direction is less than a fourth angle.
  • the image reconstruction unit 203 is configured to obtain a decoded image by reconstructing an image according to the prediction pixel value.
  • FIG. 21 illustrates a block diagram of a coding device according to another exemplary embodiment of the present disclosure.
  • the coding device includes a model constructing unit 211, a mode determining unit 212, and a TSCPM mode writing unit 213.
  • the model constructing unit 211 may be configured to determine reference samples for constructing a linear model based on availabilities of reference pixels of the current coding block and to construct a linear model based on the determined reference samples.
  • the mode determining unit 211 may be configured to select two reference samples from the reference pixels on the upper side and the reference pixels on the left side, respectively, when the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available.
  • the mode determining unit 211 may be configured to select two reference samples from the reference pixels on the upper side and the reference pixels on the right side, respectively, when the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available.
  • the mode determining unit 211 may be configured to select reference samples according to the case in which the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available. Or, the mode determining unit 211 may be configured to select reference samples according to the case in which the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available. Or, the mode determining unit 211 may be configured to select reference samples according to a case in which the rate distortion cost is small in the above two cases, when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • the mode determining unit 212 is configured to calculate a prediction pixel value of a chrominance component of a current coding block according to the constructed linear model, and to determine an intra prediction mode of the current coding block.
  • the TSCPM mode writing unit 213 is configured to write the information of the intra prediction into a bitstream, wherein the information of the intra prediction at least includes information about whether the intra prediction mode of the current coding block is TSCPM mode.
  • the information of the intra prediction may further include information about the reference pixel construction, when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • FIG. 22 illustrates a block diagram of a decoding device according to another exemplary embodiment of the present disclosure.
  • the decoding device includes a TSCPM mode parsing unit 221, a model constructing unit 222, a chrominance prediction unit 223, and a chrominance reconstruction unit 224.
  • the TSCPM mode parsing unit 221 may be configured to parse information of intra prediction from a bitstream, wherein the information of intra prediction at least includes information about whether an intra prediction mode of the current coding block is the TSCPM mode.
  • the information of the intra prediction may further include information about the reference pixel construction, when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • the model constructing unit 222 may be configured to determine reference samples for constructing a linear model based on availabilities of reference pixels of the current coding block and to construct the linear model based on the determined reference samples.
  • the model constructing unit 222 may be configured to select two reference samples from the reference pixels on the upper side and the reference pixels on the left side, respectively, when the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available.
  • the model constructing unit 222 may be configured to select two reference samples from the reference pixels on the upper side and the reference pixels on the right side, respectively, when the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available.
  • the model constructing unit 222 may be configured to select reference samples according to the case in which the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available. Or, the model constructing unit 222 may be configured to select reference samples according to the case in which the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available. Or, the model constructing unit 222 may be configured to select reference samples according to the parsed information about the reference pixel construction.
  • the chrominance prediction unit 223 is configured to calculate a prediction pixel value of a chrominance component of the current coding block according to the constructed linear model.
  • the chrominance reconstruction unit 224 is configured to obtain a decoded image by reconstructing the chrominance component of the current coding block, according to the prediction pixel value of the chrominance component of the current coding block.
  • FIG. 23 illustrates a block diagram of a coding device according to another exemplary embodiment of the present disclosure.
  • the coding device includes a first coding order determining unit 231, a second coding order determining unit 232 and a coding unit 233.
  • the first coding order determining unit 231 is configured to determine a coding order of prediction blocks in a current coding block based on a block partitioning mode and availabilities of reference pixels of the current coding block.
  • the first coding order determining unit 231 may be configured to determine the coding order of the prediction blocks to be left-to-right when the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available.
  • the first coding order determining unit 231 may be configured to determine the coding order of the prediction blocks to be right-to-left when the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available.
  • the first coding order determining unit 231 may be configured to determine the coding order of the prediction blocks to be left-to-right when neither the reference pixel value on the left side nor the reference pixel value on the right side of the current coding block is available. And the first coding order determining unit 231 may be configured to determine the coding order of the prediction blocks to be one of a left-to-right coding order, a right-to-left coding order, and a coding order with a low rate distortion cost of the left-to-right coding order and the right-to-left coding order when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • the second coding order determining unit 232 may be configured to determine a coding order of transform blocks in each prediction block of the current coding block, based on the block partitioning mode and the availabilities of the reference pixels of the current coding block.
  • the second coding order determining unit 232 may be configured to determine the coding order of the transform blocks to be left-to-right when the reference pixel value on the left side of the current prediction block is available and the reference pixel value on the right side of the current prediction block is not available.
  • the second coding order determining unit 232 may be configured to determine the coding order of the transform blocks to be right-to-left when the reference pixel value on the left side of the current prediction block is not available and the reference pixel value on the right side of the current prediction block is available.
  • the second coding order determining unit 232 may be configured to determine the coding order of the transform blocks to be left-to-right when neither the reference pixel value on the left side nor the reference pixel value on the right side of the current prediction block is available. And the second coding order determining unit 232 may be configured to determine the coding order of the transform blocks to be one of a left-to-right coding order, a right-to-left coding order, and a coding order with a lower rate distortion cost of the left-to-right coding order and the right-to-left coding order when both of the reference pixel value on the left side and the reference pixel value on the right side of the current prediction block are available.
  • the coding unit 233 may be configured to write Derived Tree (DT) mode information into a bitstream based on the determined coding order of the prediction blocks in the current coding block and the determined coding order of the transform blocks in the prediction block, wherein the DT mode information at least includes information about the block partitioning mode of the current coding block.
  • DT Derived Tree
  • the DT mode information may further include information about the coding order of the prediction blocks in the current coding block and/or information about the coding order of the transform blocks in each prediction block of the current coding block, when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • FIG. 24 illustrates a block diagram of a decoding device according to another exemplary embodiment of the present disclosure.
  • the decoding device includes a DT information parsing unit 241, a first decoding order determining unit 242, a second decoding order determining unit 243 and a decoding unit 244.
  • the DT information parsing unit 241 is configured to parsing DT mode information from a bitstream, wherein the DT mode information at least includes information about the block partitioning mode of a current coding block.
  • the DT mode information may further include information about the coding order of the prediction blocks in the current coding block and/or information about the coding order of the transform blocks in each prediction block of the current coding block.
  • the first decoding order determining unit 242 may be configured to determine a decoding order of prediction blocks in the current coding block based on a block partitioning mode and availabilities of reference pixels of the current coding block.
  • the first decoding order determining unit 242 may be configured to determine the decoding order of the prediction blocks to be left-to-right when the reference pixel value on the left side of the current coding block is available and the reference pixel value on the right side of the current coding block is not available.
  • the first decoding order determining unit 242 may be configured to determine the decoding order of the prediction blocks to be right-to-left when the reference pixel value on the left side of the current coding block is not available and the reference pixel value on the right side of the current coding block is available.
  • the first decoding order determining unit 242 may be configured to determine the decoding order of the prediction blocks to be left-to-right when neither the reference pixel value on the left side nor the reference pixel value on the right side of the current coding block is available. And the first decoding order determining unit 242 may be configured to determine the decoding order of the prediction blocks to be one of a left-to-right decoding order, a right-to-left decoding order, and a decoding order of the prediction blocks determined according to the information about the decoding order of the prediction blocks when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • the second decoding order determining unit 243 is configured to determine a decoding order of transform blocks in a prediction block based on the block partitioning mode and the availabilities of the reference pixels of the current coding block.
  • the second decoding order determining unit 243 may be configured to determine the decoding order of the transform blocks to be left-to-right when the reference pixel value on the left side of the current prediction block is available and the reference pixel value on the right side of the current prediction block is not available.
  • the second decoding order determining unit 243 may be configured to determine the decoding order of the transform blocks to be right-to-left when the reference pixel value on the left side of the current prediction block is not available and the reference pixel value on the right side of the prediction coding block is available.
  • the second decoding order determining unit 243 may be configured to determine the decoding order of the transform blocks to be left-to-right when neither the reference pixel value on the left side nor the reference pixel value on the right side of the current prediction block is available. And the second decoding order determining unit 243 may be configured to determine the decoding order of the transform blocks to be one of a left-to-right decoding order, a right-to-left decoding order, and a decoding order of the transform blocks determined according to information about the decoding order of the transform blocks in the prediction block when both of the reference pixel value on the left side and the reference pixel value on the right side of the current coding block are available.
  • the decoding unit 244 is configured to perform decoding according to the determined decoding order of the prediction blocks in the current coding block and the determined decoding order of the transform blocks in the prediction block.
  • a computer-readable storage medium storing a computer program thereon, when the computer program is executed, the method for coding and decoding according to the exemplary embodiment of the present disclosure is implemented.
  • the computer-readable storage medium may carry one or more programs, and when the computer program is executed, the following steps may be implemented: performing intra prediction on a current coding block based on availabilities of reference pixels of the current coding block and writing information of intra prediction including at least information about an intra prediction mode of the current coding block into a bitstream.
  • the computer-readable storage medium may carry one or more programs, and when the computer program is executed, the following steps may be implemented: parsing information of intra prediction including information about an intra prediction mode of a current coding block from a bitstream, calculating a prediction pixel value of the current coding block according to the parsed information of intra prediction based on availabilities of reference pixels of the current coding block, and obtaining a decoded image by reconstructing an image according to the prediction pixel value.
  • the computer-readable storage medium may carry one or more programs, and when the computer program is executed, the following steps may be implemented: determining reference samples for constructing a linear model based on availabilities of reference pixels of a current coding block, and constructing the linear model based on the determined reference samples; calculating a prediction pixel value of a chrominance component of the current coding block according to the constructed linear model, and determining an intra prediction mode of the current coding block; and writing the information of the intra prediction into a bitstream, wherein the information of the intra prediction at least includes information about whether the intra prediction mode of the current coding block is a Two Step Cross Component Prediction Mode (TSCPM) mode.
  • TCPM Two Step Cross Component Prediction Mode
  • the computer-readable storage medium may carry one or more programs, and when the computer program is executed, the following steps may be implemented: parsing information of intra prediction from a bitstream, wherein the information of intra prediction at least includes information about whether the intra prediction mode of a current coding block is TSCPM mode; determining reference samples for constructing a linear model based on availabilities of reference pixels of the current coding block, and constructing the linear model based on the determined reference samples; calculating a prediction pixel value of a chrominance component of the current coding block according to the constructed linear model; and obtaining a decoded image by reconstructing the chrominance component of the current coding block according to the prediction pixel value of the chrominance component of the current coding block.
  • the computer-readable storage medium may carry one or more programs, and when the computer program is executed, the following steps may be implemented: determining a coding order of prediction blocks in a current coding block based on a block partitioning mode and availabilities of reference pixels of the current coding block; determining a coding order of transform blocks in each prediction block of the current coding block, based on the block partitioning mode and the availabilities of the reference pixels of the current coding block; and writing Derived Tree (DT) mode information into a bitstream, based on the determined coding order of the prediction blocks in the current coding block and the determined coding order of the transform blocks in the prediction block, wherein the DT mode information at least includes information about the block partitioning mode of the current coding block.
  • DT Derived Tree
  • the computer-readable storage medium may carry one or more programs, and when the computer program is executed, the following steps may be implemented: parsing DT mode information from a bitstream, wherein the DT mode information at least includes information about a block partitioning mode of a current coding block; determining a decoding order of prediction blocks in a current coding block based on the block partitioning mode and availabilities of reference pixels of the current coding block; determining a decoding order of transform blocks in a prediction block based on the block partitioning mode and the availabilities of the reference pixels of the current coding block; and performing decoding according to the determined decoding order of the prediction blocks in the current coding block and the determined decoding order of the transform blocks in the prediction block.
  • the computer-readable storage medium may be, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above-mentioned. More specific examples of the computer-readable storage medium may include, for example, but are not limited to an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above-mentioned.
  • the computer-readable storage medium may be any tangible medium containing or storing a computer program, and the computer program may be used by an instruction execution system, an apparatus or a device or a combination thereof.
  • Computer programs contained in the computer-readable storage medium may be transmitted by any appropriate medium, including but not limited to: electrical wires, fiber optic cables, RF (radio frequency), etc., or any suitable combination of the above-mentioned.
  • the computer-readable storage medium may be contained in any device; and may also exist alone without being assembled in the device.
  • FIG. 25 illustrates a schematic diagram of a computing device according to an exemplary embodiment of the present disclosure.
  • a computing device 25 includes a storage 251 and a processor 252.
  • the storage 251 stores a computer program thereon, and when the computer program is executed by the processor 252, the coding method or the decoding method according to the exemplary embodiment of the present disclosure is implemented.
  • the following steps may be implemented: performing intra prediction on the current coding block based on availabilities of reference pixels of a current coding block, and writing information of intra prediction of the current coding block into a bitstream.
  • the following steps may be implemented: parsing information of intra prediction from a bitstream, wherein the information of intra prediction at least includes information about an intra prediction mode of a current coding block, calculating a prediction pixel value of the current coding block according to the parsed information of intra prediction, based on availabilities of reference pixels of the current coding block, and obtaining a decoded image by reconstructing an image according to the prediction pixel value.
  • the following steps may be implemented: determining reference samples for constructing a linear model based on availabilities of reference pixels of a current coding block, and constructing the linear model based on the determined reference samples; calculating a prediction pixel value of a chrominance component of the current coding block according to the constructed linear model, and determining an intra prediction mode of the current coding block; and writing the information of the intra prediction into a bitstream, wherein the information of the intra prediction at least includes information about whether the intra prediction mode of the current coding block is a Two Step Cross Component Prediction Mode (TSCPM) mode.
  • TCPM Two Step Cross Component Prediction Mode
  • the following steps may be implemented: parsing information of intra prediction from a bitstream, wherein the information of intra prediction at least includes information about whether the intra prediction mode of a current coding block is TSCPM mode; determining reference samples for constructing a linear model based on availabilities of reference pixels of the current coding block, and constructing the linear model based on the determined reference samples; calculating a prediction pixel value of a chrominance component of the current coding block according to the constructed linear model; and obtaining a decoded image by reconstructing the chrominance component of the current coding block according to the prediction pixel value of the chrominance component of the current coding block.
  • the following steps may be implemented: determining a coding order of prediction blocks in a current coding block based on a block partitioning mode and availabilities of reference pixels of the current coding block; determining a coding order of transform blocks in each prediction block of the current coding block, based on the block partitioning mode and the availabilities of the reference pixels of the current coding block; and writing Derived Tree (DT) mode information into a bitstream, based on the determined coding order of the prediction blocks in the current coding block and the determined coding order of the transform blocks in the prediction block, wherein the DT mode information at least includes information about the block partitioning mode of the current coding block.
  • DT Derived Tree
  • the following steps may be implemented: parsing DT mode information from a bitstream, wherein the DT mode information at least includes information about a block partitioning mode of a current coding block; determining a decoding order of prediction blocks in the current coding block based on the block partitioning mode and availabilities of reference pixels of the current coding block; determining a decoding order of transform blocks in a prediction block based on the block partitioning mode and the availabilities of the reference pixels of the current coding block; and performing decoding according to the determined decoding order of the prediction blocks in the current coding block and the determined decoding order of the transform blocks in the prediction block.
  • the computing device shown in Fig. 25 is only an example, which should not bring any limitation to the function and the range of application of the embodiments of the present disclosure.
  • Figs. 1-25 The method and device for coding and decoding according to the exemplary embodiments of the present disclosure have been described by referring to Figs. 1-25.
  • the video sampling apparatus and units thereof shown in Fig. 19-24 may be respectively configured as software, hardware, firmware, or any combination of the above mentioned items performing specific functions
  • the computing device shown in Fig. 25 is not limited to including the components shown above, but some components that may be added or deleted as needed, and the above components may also be combined.
  • the method and device for coding and decoding according to the exemplary embodiment of the present disclosure adopt a flexible coding order, expand the spatial reference information, and design Intra Prediction Filter (IPF) technology, Two Step Cross Component Prediction Mode (TSCPM) technology, and Derived Tree (DT) technology according to availabilities of adjacent reference pixels on the left side and the right side of the currently coding or decoding image block, which makes use of surrounding reference pixel information to the maximum extent, so that the efficiency of intra coding is improved.
  • IPF Intra Prediction Filter
  • TCPM Two Step Cross Component Prediction Mode
  • DT Derived Tree
  • the pixels on the right side of the image block are available, for the IPF technology, the pixels on the right side and the pixels on the upper side are used as the filtering pixels, that is, new predicted values are obtained by applying weights to the pixels on the right side and the pixels on the upper side, and the predicted values.
  • the TSCPM technology a linear model of the luminance component and the chrominance component is derived by using the pixels on the right side and the pixels on the upper side, and the linear model is used to predict the chrominance component.
  • the prediction blocks and the transform blocks are encoded in a right-to-left order, so that when the right-to-left coding order is used, it is still possible to make use of the encoded or decoded pixel information of the surrounding image blocks to the maximum extent, which improves the efficiency of intra prediction and thus improves the performance of video coding.

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