Intra Prediction Mode Selection Using Sub-Template Cost Analysis

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

The accuracy of prediction in the template-based intra mode derivation (TIMD) solution for intra prediction in H.266/VVC needs improvement to enhance compression efficiency.

Innovation Solution

Determine a prediction mode for a current block by analyzing costs of candidate modes on multiple sub-templates of the current block, allowing for more accurate intra prediction by applying different weighting factors to different parts of the block based on the sub-templates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If template-based intra mode derivation (TIMD) is used to estimate prediction effect on current block through template, then intra prediction accuracy is improved, but prediction accuracy still needs further improvement to enhance compression efficiency

Engineering Contradiction:

Improveprediction accuracyVSAvoidcompression efficiency

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The template is divided into multiple sub-templates, and the current block is divided into multiple sub-blocks. Different prediction modes are evaluated on each sub-template independently, allowing for more granular and accurate prediction mode selection for different regions of the current block, thereby improving overall prediction accuracy and compression efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different prediction modes are selected for different sub-blocks based on their respective sub-template evaluations. This allows each sub-block to have its own optimized prediction mode, improving local prediction quality and overall compression efficiency by adapting to local characteristics rather than using a single global prediction mode.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12574508B2Intra prediction methods, encoder and decoder

Publication Date: 2026.03.10 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

Intra prediction methods, an encoder, and a decoder are provided. In the method, a template of a current block is divided into sub-templates; a prediction mode is determined according to costs of candidate modes on the sub-templates of the current block; an intra prediction value of a current frame can then be determined according to the prediction mode.