Reordering decoder-side intra mode derivation merge mode candidates

The DIMD merge mode in video coding technologies addresses the challenge of intra mode derivation by generating and reordering a list of DIMD merge candidates, resulting in reduced bitrate and enhanced compression efficiency.

WO2025080497A1PCT designated stage expired Publication Date: 2025-04-17OFINNO LLC
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Patent Information

Application Number
PCT/US2024/049876
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-10-09
Filing Date
2024-10-04
Publication Date
2025-04-17

AI Technical Summary

Technical Problem

Existing video coding technologies face challenges in efficiently deriving intra modes for video blocks, particularly in decoder-side processing, which can lead to increased bitrates and reduced compression efficiency.

Method used

The proposed solution involves a decoder-side intra mode derivation (DIMD) merge mode that generates a list of DIMD merge candidates by combining DIMD information from spatial and temporal neighboring blocks, and then reorders this list using template-based and direction-based reordering techniques to enhance encoding efficiency.

Benefits of technology

This approach reduces the bitrate by allowing the decoder to efficiently derive optimal intra prediction modes without explicit signaling from the encoder, thereby improving compression efficiency and video quality.

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Abstract

A video coder (encoder or decoder) reorders a list of merge candidates. The list of merge candidates comprises a merge candidate comprising decoder-side intra mode derivation (DIMD) information or Template-based Intra Mode Derivation (TIMD) information associated with a spatially neighboring block of a current block in a current frame. The video coder determines an indicator of the merge candidate in the list of merge candidates and codes the current block based on the DIMD information of the merge candidate in the list of merge candidates according to the indicator.
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Citation Information

Patent Citations

  • Method, apparatus, and medium for video processing

    WO2023072283A1

  • Intra prediction modes signaling

    WO2023081322A1

Cited By

  • Intra merge list with derived candidates

    WO2025207777A1