Image encoding / decoding method and device, and recording medium on which bitstream is stored

By constructing candidate lists and using DIPMs for intra-prediction modes based on reference blocks, the method addresses inefficiencies in encoding and decoding high-resolution video, enhancing coding efficiency.

WO2026155624A1PCT designated stage Publication Date: 2026-07-23LG ELECTRONICS INC
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
LG ELECTRONICS INC
Filing Date
2026-01-19
Publication Date
2026-07-23

AI Technical Summary

Technical Problem

Existing video compression technologies face challenges in efficiently encoding and decoding high-resolution, high-quality video due to limitations in intra-prediction modes, particularly when dealing with blocks coded in non-normal modes, leading to suboptimal coding efficiency.

Method used

The method involves constructing a candidate list for a current block based on a reference block, setting candidate modes for the current block, and deriving predicted samples using Derived Intra Prediction Modes (DIPMs) or intra-prediction modes from the reference block, especially when it is coded in non-normal modes, to improve coding efficiency.

Benefits of technology

This approach enhances the coding efficiency of intra prediction by effectively configuring candidate modes and lists, thereby improving the overall video encoding and decoding process.

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Abstract

An image decoding method and device according to the present disclosure can construct a candidate list for a current block on the basis of a candidate mode of the current block, derive prediction samples of the current block on the basis of the candidate list, and reconstruct the current block on the basis of the prediction samples. Here, the candidate mode of the current block can be derived on the basis of a predetermined reference block.
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