Intra Prediction Mode Selection for Block-Shape Video Coding

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Solution Overview

Problem

Existing image encoding/decoding methods do not consider the form of a current block, limiting the efficiency of intra prediction and increasing data transfer and storage costs for high-definition and high-quality pictures.

Innovation Solution

Derive an intra prediction mode for a current block based on a most probable mode (MPM) using neighboring block modes, construct a reference sample, and perform intra prediction using this mode, with MPM lists including neighboring block modes and adjusted values.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If intra prediction is performed without considering block form, then the encoding process is simple, but the encoding efficiency is limited

Engineering Contradiction:

Improveencoding efficiencyVSAvoidprediction process complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies local quality by determining intra prediction modes differently based on the specific form (aspect ratio) of each current block. Non-square blocks use directional prediction modes optimized for their orientation, while square blocks use different modes, thereby adapting the prediction quality to local block characteristics and improving overall encoding efficiency.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent introduces dynamics by making the intra prediction mode selection adaptive to the block form rather than static. The encoder dynamically chooses between different prediction modes (e.g., horizontal, vertical, diagonal) based on whether the current block is non-square or square, allowing the system to respond optimally to varying block geometries.

Inventive Principle:

Principle #15Dynamics

2Manufacturing precision

If high-definition high-quality pictures are used, then picture quality is improved, but data transfer and storage costs increase

Engineering Contradiction:

Improvepicture qualityVSAvoiddata volume

Core Design Contradiction:

Manufacturing precisionVSQuantity of substance

Solution Approach 1:

The patent changes the parameter of prediction mode selection based on block form characteristics. By optimizing the intra prediction mode according to whether blocks are square or non-square, the system improves compression efficiency, thereby reducing the overall data volume of high-definition pictures while maintaining picture quality.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12470696B2Intra prediction mode encoding/decoding method and device, and recording medium in which bitstream is stored

Publication Date: 2025.11.11 INTELLECTUAL DISCOVERY CO LTD

AI summary

There is provided a method and apparatus of encoding/decoding an intra prediction mode. The method comprises deriving an intra prediction mode with respect to a current block, constructing a reference sample for the current block on the basis of the derived intra prediction mode, and performing the intra prediction with respect to the current block using the derived intra prediction mode and the constructed reference sample, wherein the intra prediction mode is derived on the basis of a most probable mode (MPM).