Adaptive Reference Sample Lines for Intra Image Prediction

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Solution Overview

Problem

High-resolution and high-quality image data requires high-efficiency encoding/decoding techniques to manage increasing data volumes, leading to higher transmission and storage costs.

Innovation Solution

An image encoding/decoding method utilizing intra prediction with adaptive configuration of reference sample lines, including padding and filtering, to enhance compression efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If conventional image encoding techniques are used for high-resolution images, then transmission and storage costs increase, but image quality and resolution are maintained

Engineering Contradiction:

Improvetransmission and storage costsVSAvoidimage data volume

Core Design Contradiction:

Loss of energyVSQuantity of substance

Solution Approach 1:

The current block is divided into multiple prediction blocks, and different intra prediction modes are applied to different segments. This allows more precise local prediction, reducing residual energy and improving compression efficiency without sacrificing image quality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent dynamically selects intra prediction modes and adapts the number of reference sample lines based on block characteristics. This dynamic adaptation optimizes compression for different image regions, reducing overall data volume while maintaining quality.

Inventive Principle:

Principle #15Dynamics

2Manufacturing precision

If the number of reference sample lines is increased to improve prediction accuracy, then compression efficiency improves, but computational complexity increases

Engineering Contradiction:

Improveprediction accuracyVSAvoidcomputational complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent uses a limited number of reference sample lines (typically 2-4 lines) rather than all available reference samples. This partial action provides sufficient prediction accuracy for most cases while avoiding the excessive computational complexity of using all reference data.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent changes the parameter of reference sample line configuration adaptively based on prediction mode and block characteristics. This allows optimization of the balance between prediction accuracy and computational complexity for different scenarios.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If padding is performed on reference samples to ensure availability, then intra prediction can be performed without boundary issues, but additional processing steps are required

Engineering Contradiction:

Improvereference sample availabilityVSAvoidprocessing steps

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent performs padding of reference samples in advance, before the actual intra prediction process. This preliminary action ensures that all necessary reference samples are available, preventing boundary issues during prediction while the padding can be efficiently integrated into the existing processing pipeline.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12549715B2Method and device for encoding/decoding image, and recording medium in which bitstream is stored

Publication Date: 2026.02.10 LX SEMICON CO LTD

AI summary

An image encoding/decoding method and apparatus for performing intra prediction using a plurality of reference sample lines are provided. An image decoding method may comprise configuring a plurality of reference sample lines, reconstructing an intra prediction mode of a current block, and performing intra prediction for the current block based on the intra prediction mode and the plurality of reference sample lines.