Decoder Side Intra Mode Derivation MPM List Construction

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Solution Overview

Problem

Existing video coding techniques, such as those using decoder-side Intra Mode Derivation (DIMD), face inefficiencies due to potential underutilization of DIMD modes and sacrifices in robustness, where optimal prediction may be from a single mode rather than blended modes, leading to suboptimal coding efficiency.

Innovation Solution

Incorporating DIMD derived modes into the Most Probable Mode (MPM) list, allowing for selection of the optimal prediction mode, either from derived modes or single modes, to enhance coding efficiency by reducing bit usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If DIMD prediction is used with blended prediction from multiple derived modes, then coding efficiency may be improved through implicit mode derivation, but robustness is sacrificed because the optimal prediction mode might be a single mode rather than a blended prediction

Engineering Contradiction:

Improvecoding efficiencyVSAvoidrobustness

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent changes the parameter of prediction mode representation by including DIMD-derived modes as discrete candidates in the MPM list with specific indices, allowing the decoder to select the optimal mode (either single or blended) based on the signaled index without sacrificing robustness

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces dynamic selection capability where the video coder can signal which specific DIMD-derived mode from the MPM list to use, enabling adaptive choice between single mode and blended prediction based on actual content characteristics rather than fixed blended prediction

Inventive Principle:

Principle #15Dynamics

2Reliability

If traditional MPM list construction is used without DIMD modes, then robustness is maintained through explicit mode signaling, but coding efficiency is reduced due to increased bit usage for mode representation

Engineering Contradiction:

ImproverobustnessVSAvoidcoding efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent merges DIMD-derived modes with traditional MPM list construction, combining the benefits of implicit mode derivation (coding efficiency) with explicit mode signaling (robustness) by integrating DIMD modes as candidates in the unified MPM list

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent creates a universal MPM list construction method that can accommodate both traditional neighboring block modes and DIMD-derived modes, allowing the system to function effectively with either explicit signaling or implicit derivation depending on the specific coding scenario

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11671589B2Decoder side intra mode derivation for most probable mode list construction in video coding

Publication Date: 2023.06.06 QUALCOMM INC

AI summary

An method of decoding video data includes deriving, for a current block of video data and using decoder side intra mode derivation (DIMD), a list of intra modes using reconstructed samples of neighboring blocks; constructing, for the current block, a most probable mode (MPM) list, wherein constructing the MPM list comprises inserting, into the MPM list, at least one intra mode from the derived list of intra modes; and predicting, using a candidate selected from the constructed MPM list, the current block.