Constructed Reference Samples for Image Intra Prediction

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Solution Overview

Problem

High-resolution and high-quality image data requires high-efficiency encoding/decoding techniques to reduce the increased costs of transmission and storage associated with conventional methods.

Innovation Solution

The method involves deriving an intra prediction mode using rightmost and bottommost samples of a block, constructing reference samples through interpolation, and performing intra prediction with weighted sums and overlay predictors to enhance compression efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

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

Engineering Contradiction:

Improveimage qualityVSAvoidtransmission and storage costs

Core Design Contradiction:

Measurement precisionVSLoss of energy

Solution Approach 1:

The image block is divided into multiple regions (e.g., first block, second block, third block, fourth block) with different prediction modes applied to each region. This segmentation allows the patent to use more complex prediction methods for critical areas while using simpler methods for other areas, thereby improving overall image quality while controlling compression complexity and transmission costs.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different prediction modes (e.g., planar mode for some regions, directional modes for others) are applied to different regions of the image block based on local characteristics. This local quality approach ensures that each region is encoded with the most appropriate method for its specific features, improving overall image quality while maintaining efficient compression.

Inventive Principle:

Principle #3Local quality

2Device complexity

If intra prediction uses only top and left reference samples, then device complexity is reduced, but compression efficiency deteriorates

Engineering Contradiction:

Improveprediction process complexityVSAvoidcompression efficiency

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent extends the reference sample usage from traditional top and left directions to include bottom and right directions as well. By utilizing reference samples from all four directions (top, left, bottom, right), the patent improves prediction accuracy and compression efficiency while maintaining manageable device complexity through systematic processing.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent creates multiple prediction blocks (first, second, third, fourth blocks) using different prediction modes, each serving different functional purposes. This multi-functionality approach allows the system to handle various image characteristics efficiently, improving overall compression efficiency without significantly increasing device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20250310521A1Image encoding/decoding method and apparatus, and recording medium for storing bitstream that involves performing intra prediction using constructed reference sample

Publication Date: 2025.10.02 INTELLECTUAL DISCOVERY CO LTD

AI summary

A method of decoding an image includes, deriving an intra prediction mode for a current block, decoding at least one original sample that is present in a rightmost column and a bottommost row (a bottom row) of the current block, constructing a reference sample by using the at least one decoded original sample and performing intra prediction on the current block by using the constructed reference sample.