Matrix Intra Prediction Mode Derivation to Reduce Signaling

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Solution Overview

Problem

Existing video coding techniques face inefficiencies due to the addition of additional matrix intra prediction (MIP) modes, which can increase signaling overhead and decrease coding efficiency.

Innovation Solution

The techniques determine a prediction mode from a set of possible modes using information from the current block and neighboring blocks, employing decoder-side intra mode derivation (DIMD) and low frequency non-separable transform (LFNST) for improved coding efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If additional matrix intra prediction (MIP) modes are added to improve prediction accuracy, then coding efficiency deteriorates due to increased signaling overhead

Engineering Contradiction:

Improveprediction accuracyVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent changes the parameter of prediction mode selection by using decoder-side intra mode derivation (DIMD) to implicitly determine MIP mode based on block characteristics (size, position, neighboring block information) rather than explicitly signaling the mode. This parameter change eliminates the need for additional syntax elements while maintaining prediction accuracy.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent enables the decoder to self-determine the prediction mode using available block information without requiring explicit signaling from the encoder. The decoder uses DIMD to derive the MIP mode index based on block size, position, and neighboring block characteristics, making the system self-sufficient and reducing signaling overhead.

Inventive Principle:

Principle #25Self-service

2Adaptability or versatility

If multiple prediction modes are supported to improve coding flexibility, then device complexity increases

Engineering Contradiction:

Improvecoding flexibilityVSAvoidmode determination complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent simplifies device complexity by changing the approach from explicit mode signaling to implicit mode derivation. The decoder uses a standardized DIMD process that determines MIP mode based on block parameters (size, position, neighboring blocks), reducing the complexity of mode determination while maintaining coding flexibility.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a universal DIMD mechanism that can determine multiple prediction modes (PM_0, PM_1, PM_2) using the same block characteristics and neighboring information. This multi-functional approach allows a single derivation process to handle different prediction scenarios, reducing overall system complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20250324040A1Position and block characteristics dependent matrix intra prediction for video coding

Publication Date: 2025.10.16 QUALCOMM INC

AI summary

A video coder is configured to receive a syntax element indicating a prediction mode type for a current block of video data, determine a prediction mode having the prediction mode type from a set of two more possible prediction modes based on one or more of information related to the current block or information related to neighboring blocks of the current block, and code the current block using the prediction mode. The prediction mode type may be a matrix intra prediction (MIP) mode.