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    Image encoding/decoding method and device for determining division mode on basis of color format, and method for transmitting bitstream
    12.
    发明授权
    Image encoding/decoding method and device for determining division mode on basis of color format, and method for transmitting bitstream 有权

    公开(公告)号：US11997261B2

    公开(公告)日：2024-05-28

    申请号：US17968311

    申请日：2022-10-18

    Applicant: LG ELECTRONICS INC.

    Inventor： Hyeong Moon Jang

    IPC: H04N19/109 ,  H04N19/176 ,  H04N19/186 ,  H04N19/70

    CPC classification number: H04N19/109 ,  H04N19/176 ,  H04N19/186 ,  H04N19/70

    Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may comprise determining prediction mode characteristic information based on a color format of a current block, determining a prediction mode type of a lower-layer block split from the current block based on the prediction mode characteristic information, obtaining the lower-layer block by splitting the current block based on the prediction mode type of the lower-layer block, and decoding the lower-layer block based on the prediction mode type of the lower-layer block. The prediction mode type of the lower-layer block comprises a first prediction mode type specifying that both an intra prediction mode and an inter prediction mode are available, a second prediction mode type specifying that only the intra prediction mode is available and a third prediction mode type specifying that only the inter prediction mode is available. Based on a first condition for the current block being satisfied, the prediction mode characteristic information has a first value, and the first condition comprises a case where a color format of the current block is a monochrome format or a 4:4:4 format. Based on the first condition for the current block being not satisfied, the prediction mode characteristic information has a second value or a third value based on at least one of a color format, split mode or size of the current block.

    Video encoding/decoding method and apparatus for performing PDPC and method for transmitting bitstream
    18.
    发明授权
    Video encoding/decoding method and apparatus for performing PDPC and method for transmitting bitstream 有权

    公开(公告)号：US12177450B2

    公开(公告)日：2024-12-24

    申请号：US18234710

    申请日：2023-08-16

    Applicant: LG Electronics Inc.

    Inventor： Jin Heo ,  Hyeong Moon Jang ,  Jangwon Choi

    IPC: H04N19/159 ,  H04N19/105 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186

    Abstract: An image encoding/decoding method and apparatus include features of generating a prediction block by performing intra prediction on a current block, determining whether to apply position dependent intra prediction combination (PDPC) to the prediction block, and generating a final prediction block of the current block, by applying PDPC to the prediction block based on the determination. The determining whether to apply PDPC to the prediction block may include determining whether a size of the current block satisfies a predetermined condition. Based on the size of the current block satisfying the predetermined condition, it may be determined to apply PDPC to the prediction block. Based on the size of the current block not satisfying the predetermined condition, a determination of a color component of the current block may be skipped and it may be determined not to apply PDPC to the prediction block.

    IMAGE ENCODING/DECODING METHOD AND APPARATUS USING QUANTIZATION MATRIX, AND METHOD FOR TRANSMITTING BITSTREAM
    19.
    发明公开
    IMAGE ENCODING/DECODING METHOD AND APPARATUS USING QUANTIZATION MATRIX, AND METHOD FOR TRANSMITTING BITSTREAM 审中-公开

    公开(公告)号：US20240348774A1

    公开(公告)日：2024-10-17

    申请号：US18751625

    申请日：2024-06-24

    Applicant: LG ELECTRONICS INC.

    Inventor： Hyeong Moon Jang ,  Seung Hwan Kim

    IPC: H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46 ,  H04N19/70

    CPC classification number: H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46 ,  H04N19/70

    Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus comprises obtaining quantization mode information for a current block from a bitstream, determining whether a quantization matrix for the current block is constructed from a reference quantization matrix, based on the quantization mode information, and constructing the quantization matrix for the current block, based on a result of determination. When the quantization matrix for the current block is constructed from the reference quantization matrix, the quantization matrix for the current block may be constructed based on identification information of the reference quantization matrix. When the quantization matrix for the current block is not constructed from the reference quantization matrix, the quantization matrix for the current block may be constructed based on a value of the quantization matrix obtained from the bitstream. When the current block is an intra-predicted chroma block, the quantization matrix for the current block may be constructed only when a size of the current block is greater than 2×2.

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