Intra Prediction Mode Coding with Candidate Mode Prioritization

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Solution Overview

Problem

The increasing demand for high resolution and quality video data leads to higher data volumes, increasing costs for transmission and storage, necessitating more efficient video compression technologies.

Innovation Solution

A method and apparatus for encoding and decoding intra prediction modes using multiple candidate intra prediction modes, including determining and deriving candidate modes from neighboring blocks and prioritizing based on planar, DC, and vertical modes, to improve video encoding efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If traditional intra prediction mode encoding is used, then video quality is maintained, but data volume and transmission costs increase

Engineering Contradiction:

Improvedata volumeVSAvoidvideo quality

Core Design Contradiction:

Quantity of substanceVSManufacturing precision

Solution Approach 1:

The patent uses mode copying by deriving candidate intra prediction modes from neighboring blocks. Instead of encoding all possible intra prediction modes, the system copies relevant mode information from adjacent blocks to generate a limited set of candidates, significantly reducing the data volume required for encoding while maintaining prediction accuracy and video quality.

Inventive Principle:

Principle #26Copying

2Productivity

If multiple candidate intra prediction modes are derived and prioritized, then encoding efficiency improves, but decoding complexity increases

Engineering Contradiction:

Improveencoding efficiencyVSAvoiddecoding complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by pre-deriving and prioritizing candidate intra prediction modes at the encoder side before actual encoding. The modes are ordered based on probability or significance (e.g., planar, DC, vertical modes prioritized), allowing the encoder to efficiently select the best mode. The decoder simply follows the same prioritization rules to reconstruct modes without complex computations, thus improving encoding efficiency while keeping decoding complexity low.

Inventive Principle:

Principle #10Preliminary action

3Quantity of substance

If shorter codewords are used to represent intra prediction modes, then compression ratio improves, but mode representation precision may be reduced

Engineering Contradiction:

Improvecodeword lengthVSAvoidmode representation accuracy

Core Design Contradiction:

Quantity of substanceVSMeasurement precision

Solution Approach 1:

The patent applies local quality by using different codeword lengths for different intra prediction modes based on their probability of occurrence. High-probability modes (such as planar, DC, and vertical modes) are assigned shorter codewords, while less frequent modes receive longer codewords. This differential encoding approach reduces the overall average codeword length and improves compression ratio while maintaining precise representation of all modes through the variable-length coding scheme.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20260075216A1Methods and apparatuses of encoding/decoding intra prediction mode using candidate intra prediction modes

Publication Date: 2026.03.12 DOLBY LABORATORIES LICENSING CORP

AI summary

A method and an apparatus of encoding/decoding intra prediction mode using a plurality of candidate intra prediction modes are disclosed. The method includes deriving three candidate intra prediction modes about a current block and deriving an intra prediction mode of the current block.