Invention Application
- Patent Title: IMAGE CODING METHOD BASED ON TRANSFORM, AND DEVICE THEREFOR
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Application No.: US17762634Application Date: 2020-09-23
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Publication No.: US20220353504A1Publication Date: 2022-11-03
- Inventor: Moonmo KOO , Jaehyun LIM , Seunghwan KIM
- Applicant: LG ELECTRONICS INC.
- Applicant Address: KR Seoul
- Assignee: LG ELECTRONICS INC.
- Current Assignee: LG ELECTRONICS INC.
- Current Assignee Address: KR Seoul
- International Application: PCT/KR2020/012859 WO 20200923
- Main IPC: H04N19/132
- IPC: H04N19/132 ; H04N19/60 ; H04N19/18 ; H04N19/176

Abstract:
An image decoding method according to the present document comprises the steps of: when an ISP is applied to a current block and the width or height of a sub-partition block is less than or equal to 2, applying LFNST to the transform coefficients to derive modified transform coefficients; deriving residual samples for the objective block on the basis of an inverse primary transform for the modified transform coefficients; and generating a reconstructed picture on the basis of the residual samples for the objective block, wherein when the sub-partition block is an N×2 block or a 2×N block, (M×2) or (2×M) number of modified transform coefficients are derived by applying an LFNST matrix to a predetermined number of transform coefficients in an upper left M×2 area or 2×M (M≤N) area of the sub-partition block.
Public/Granted literature
- US12206856B2 Image coding method based on transform, and device therefor Public/Granted day:2025-01-21
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