Affine motion prediction-based image decoding method and device using affine merge candidate list in image coding system

    公开(公告)号:US12206889B2

    公开(公告)日:2025-01-21

    申请号:US18240219

    申请日:2023-08-30

    Inventor: Jaeho Lee

    Abstract: An image decoding method performed by means of a decoding device according to the present disclosure comprises the steps of: configuring an affine merge candidate list with respect to a current block; deriving CPMVs with respect to CPs of the current block on the basis of the affine merge candidate list; deriving prediction samples with respect to the current block on the basis of the CPMVs; and generating a reconstructed picture with respect to the current block on the basis of the derived prediction samples, wherein the maximum number of inherited affine candidates is two, a first inherited affine candidate is derived on the basis of a left block group of the current block, and a second inherited affine candidate is derived on the basis of an upper block group of the current block.

    Inter-prediction method and apparatus in image coding system

    公开(公告)号:US12160583B2

    公开(公告)日:2024-12-03

    申请号:US18368336

    申请日:2023-09-14

    Abstract: An image decoding method performed by a decoding apparatus includes the operations: deriving a correspondence block corresponding to the current block of the current picture, the correspondence block being located in a co-located picture; deriving a movement vector of the correspondence block; scaling the movement vector of the correspondence block based on a first temporal distance and second temporal distance, the first temporal distance being the difference between the POC values of the co-located picture and POC values of the reference picture of the correspondence block, and the second temporal distance being the difference between the POC values of the co-located picture and POC values of the current picture containing the current block; deriving the movement vector updated based on the scaled movement vector and location of the current block; and deriving a movement vector of the current block based on the updated movement vector.

    Method for processing image on basis of inter-prediction mode and apparatus therefor

    公开(公告)号:US12058344B2

    公开(公告)日:2024-08-06

    申请号:US18107782

    申请日:2023-02-09

    Inventor: Jaeho Lee

    CPC classification number: H04N19/159 H04N19/105 H04N19/176 H04N19/52 H04N19/70

    Abstract: Disclosed are a method for decoding a video signal and an apparatus therefor. Specifically, a method for decoding an image based on an inter-prediction mode may include: configuring a merge candidate list by using motion information of a spatial candidate and a temporal candidate adjacent to a current block; parsing a first syntax element indicating a particular candidate applied to inter-prediction of the current block among a predefined number of candidates in the merge candidate list; deriving a refined candidate by adding a motion vector offset to a motion vector of a candidate indicated by the first syntax element; and generating a prediction block of the current block by using the motion information of the refined candidate.

    Method and device for processing video signal by using affine motion prediction

    公开(公告)号:US11758170B2

    公开(公告)日:2023-09-12

    申请号:US17831119

    申请日:2022-06-02

    Inventor: Jaeho Lee

    CPC classification number: H04N19/44 H04N19/105 H04N19/176 H04N19/70

    Abstract: Disclosed are a method for processing a video signal by using an affine motion prediction and an apparatus thereof. A method for processing a video signal according to the present disclosure may include: adding, to an affine candidate list, an affine coded block coded in an affine prediction mode among neighbor blocks of a current block; obtaining a syntax element indicating a candidate used for the affine motion prediction of the current block in the affine candidate list; deriving a control point motion vector predictor of the current block based on an affine motion model of the candidate indicated by the syntax element; deriving a control point motion vector of the current block by adding a control point motion vector difference to the control point motion vector predictor; and generating a prediction block of the current block by using the control point motion vector of the current block.

    Image coding method based on affine motion prediction, and device for same

    公开(公告)号:US11323696B2

    公开(公告)日:2022-05-03

    申请号:US17060657

    申请日:2020-10-01

    Inventor: Jaeho Lee

    Abstract: A picture decoding method implemented by a decoding device, according to the present invention, comprises the steps of: acquiring motion prediction information from a bitstream; generating an affine MVP candidate list comprising affine MVP candidates for the current block; deriving CPMVPs for the respective CPs of the current block on the basis of one affine MVP candidate among the affine MVP candidates included in the affine MVP candidate list; deriving CPMVDs for the CPs of the current block on the basis of information on the CPMVDs for the respective CPs included in the acquired motion prediction information; and deriving CPMVs for the CPs of the current block on the basis of the CPMVPs and the CPMVDs.

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