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    Chroma intra prediction in video coding
    231.
    发明授权
    Chroma intra prediction in video coding 有权

    公开(公告)号：US11019332B2

    公开(公告)日：2021-05-25

    申请号：US16829626

    申请日：2020-03-25

    Applicant: QUALCOMM Incorporated

    Inventor： Hongtao Wang ,  Han Huang ,  Yu Han ,  Geert Van der Auwera ,  Wei-Jung Chien ,  Marta Karczewicz

    IPC: H04N19/11 ,  H04N19/139 ,  H04N19/132 ,  H04N19/159 ,  H04N19/70 ,  H04N19/186 ,  H04N19/176

    Abstract: A video coder selects a set of wide-angle intra prediction directions based on a size of a luma block of a picture having a YUV 4:2:2 chroma sampling format. Additionally, the video coder determines an intra prediction direction for the luma block. The intra prediction direction for the luma block is in the set of wide-angle intra prediction directions. The video coder also determines an intra prediction direction for a chroma block. The luma block is collocated in the picture with the chroma block. The chroma block has a different width/height ratio than the luma block. The intra prediction direction for the chroma block is guaranteed to have the intra prediction direction for the luma block. The video coder uses the intra prediction directions for the luma and chroma blocks to generate prediction blocks for the luma and chroma blocks, respectively.

    BLOCK-BASED QUANTIZED RESIDUAL DOMAIN PULSE CODE MODULATION ASSIGNMENT FOR INTRA PREDICTION MODE DERIVATION
    232.
    发明申请
    BLOCK-BASED QUANTIZED RESIDUAL DOMAIN PULSE CODE MODULATION ASSIGNMENT FOR INTRA PREDICTION MODE DERIVATION 审中-公开

    公开(公告)号：US20200344469A1

    公开(公告)日：2020-10-29

    申请号：US16854720

    申请日：2020-04-21

    Applicant: QUALCOMM Incorporated

    Inventor： Muhammed Zeyd COBAN ,  Geert Van der Auwera ,  Marta KARCZEWICZ

    IPC: H04N19/105 ,  H04N19/159 ,  H04N19/46 ,  H04N19/186 ,  H04N19/176

    Abstract: Techniques are described for improving video coding. For example, a first block of a picture included in an encoded video bitstream can be obtained. A second block of the picture can be determined as being coded (e.g., encoded) using a type of block-based quantized residual domain pulse code modulation (BDPCM) mode, such as vertical BDPCM mode or horizontal BDPCM mode. In the event the second block is coded using the vertical BDPCM mode, a vertical intra-prediction mode can be determined for an intra-prediction mode list for the first block. The vertical intra-prediction mode can be added to the intra-prediction mode list for the first block. In the event the second block is coded using the horizontal BDPCM mode, a horizontal intra-prediction mode can be determined for the intra-prediction mode list for the first block and the horizontal intra-prediction mode can be added to the intra-prediction mode list.

    RECONSTRUCTION OF BLOCKS OF VIDEO DATA USING BLOCK SIZE RESTRICTION
    234.
    发明申请
    RECONSTRUCTION OF BLOCKS OF VIDEO DATA USING BLOCK SIZE RESTRICTION 审中-公开

    公开(公告)号：US20200296367A1

    公开(公告)日：2020-09-17

    申请号：US16813508

    申请日：2020-03-09

    Applicant: QUALCOMM Incorporated

    Inventor： Luong Pham Van ,  Geert Van der Auwera ,  Adarsh Krishnan Ramasubramonian ,  Han Huang ,  Marta Karczewicz

    IPC: H04N19/119 ,  H04N19/96 ,  H04N19/186 ,  H04N19/176

    Abstract: A method of decoding video data includes determining, by one or more processors implemented in circuitry, a partition of the video data into a plurality of blocks. The partition of the video data applies a block size restriction to prevent a splitting of a block of the plurality of blocks that would result in a small block comprising a block width and a block height when the block height times the block width is less than a threshold. The method further includes generating, by the one or more processors, prediction information for the block and determining, by the one or more processors, a predicted block for the block based on the prediction information. The method further includes decoding, by the one or more processors, a residual block for the block and combining, by the one or more processors, the predicted block and the residual block to decode the block.

    SUB-PARTITION INTRA PREDICTION
    236.
    发明申请
    SUB-PARTITION INTRA PREDICTION 审中-公开

    公开(公告)号：US20200252608A1

    公开(公告)日：2020-08-06

    申请号：US16777732

    申请日：2020-01-30

    Applicant: QUALCOMM Incorporated

    Inventor： Adarsh Krishnan RAMASUBRAMONIAN ,  Geert Van der Auwera ,  Luong PHAM VAN ,  Marta KARCZEWICZ

    IPC: H04N19/119 ,  H04N19/176 ,  H04N19/59 ,  H04N19/61 ,  H04N19/593

    Abstract: Techniques are described for improving intra-subpartitioning (ISP) mode for splitting coding blocks into sub-blocks. In some cases, whether ISP mode is enabled for a coding block is based on size constraints pertaining to data units (e.g., VPDUs, transform blocks, among others). For instance, based on a size constraint related to a VPDU, the ISP mode can be disabled for coding blocks crossing VPDU boundaries. In some cases, whether to enable ISP mode may be based on comparison of the width and/or height of the coding block to size thresholds corresponding to one or more maximum transform block sizes. In some cases, where the ISP mode is enabled for a coding block, a value of a flag used for defining a type of split, horizontal or vertical, for the coding block, can be inferred based on the width and/or height of the coding block relative to one or more thresholds.

    CROSS-COMPONENT PREDICTION FOR VIDEO CODING
    237.
    发明申请
    CROSS-COMPONENT PREDICTION FOR VIDEO CODING 审中-公开

    公开(公告)号：US20200154115A1

    公开(公告)日：2020-05-14

    申请号：US16678041

    申请日：2019-11-08

    Applicant: QUALCOMM Incorporated

    Inventor： Adarsh Krishnan Ramasubramonian ,  Geert Van der Auwera ,  Cheng-Teh Hsieh ,  Marta Karczewicz

    IPC: H04N19/186 ,  H04N19/176 ,  H04N19/159 ,  H04N19/124

    Abstract: A video coder determines a boundary luma value and derives a chroma value that corresponds to the boundary luma value. The video coder may derive a first prediction model and a second prediction model based on the derived chroma value. The video coder may use the first prediction model to determine a first set of predicted chroma samples of a prediction block for the current block. The first set of predicted chroma samples corresponds to the luma samples of the prediction block that have values less than or equal to the boundary luma value. The video coder may use the second prediction model to determine a second set of predicted chroma samples of the prediction block. The second set of predicted chroma samples corresponds to the luma samples of the prediction block that have values greater than the boundary luma value.

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