Video Intra Sub-Partition Coding With Multiple Transform Selection

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing video encoding and decoding technologies face challenges in achieving high compression efficiency, particularly in intra coding, due to limitations in transform selection and prediction methods for intra sub block partitions.

Innovation Solution

The implementation of multiple transform selection and matrix-based intra prediction modes for intra sub partitions, allowing for improved compression efficiency by applying a set of transforms or intra prediction techniques to sub-partitions based on 2D matrices and 1D vectors, or predicting samples using multiple reference lines.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple transform selection and matrix-based intra prediction modes are applied to intra sub partitions, then compression efficiency is improved, but device complexity increases

Engineering Contradiction:

Improvecompression efficiencyVSAvoidtransform selection and prediction method complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The coding unit is divided into multiple intra sub partitions, each of which can independently apply different transform types and prediction modes. This segmentation allows flexible adaptation to different block characteristics while managing complexity through localized processing decisions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically selects from multiple transform types (e.g., DCT, DST, ADCT) and prediction modes based on the specific characteristics of each intra sub partition. This dynamic adaptation enables optimization of compression efficiency for each block while maintaining a manageable complexity through structured selection processes.

Inventive Principle:

Principle #15Dynamics

2Productivity

If multiple transform types and prediction modes are provided for intra sub partitions, then compression efficiency improves, but the complexity of selecting and signaling the appropriate transforms increases

Engineering Contradiction:

Improvecompression efficiencyVSAvoidtransform selection and signaling complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The system changes parameters such as transform type, prediction mode, and reference line selection based on block size, position, and content characteristics. By systematically varying these parameters across different intra sub partitions, the system achieves high compression efficiency while using structured parameter changes to manage selection and signaling complexity.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250337891A1Intra sub partitions for video encoding and decoding combined with multiple transform selection, matrix weighted intra prediction or multi-reference-line intra prediction

Publication Date: 2025.10.30 INTERDIGITAL CE PATENT HOLDINGS SAS

AI summary

In an encoding apparatus or a decoding apparatus, an encoding method or decoding method combines various coding tools with intra sub partitioning mode in which a coding unit is split in multiple sub partitions. At least one embodiment particularly aims at the selection of primary transforms among a set of multiple transforms for video encoding or decoding of intra sub block partitions. At least one embodiment particularly aims at intra coding using Matrix-Based Intra Prediction mode combined with Intra Sub Partition mode. At least one embodiment particularly aims at intra coding using Multi-Reference-Line intra prediction mode combined with Intra Sub Partition mode.