Decoder-Side Intra Prediction Derivation for Bitstream Overhead Reduction

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Solution Overview

Problem

The increasing demand for high-resolution, high-quality video and immersive media formats necessitates more efficient image compression techniques to reduce transmission and storage costs, as existing methods are inadequate for handling the increased data volume.

Innovation Solution

An intra prediction method that derives intra prediction modes using Decoder side Intra Mode Derivation (DIMD) information from a bitstream, reducing the need to signal intra prediction modes explicitly and improving coding efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If intra prediction mode is signaled through bitstream, then decoding accuracy is improved, but transmission overhead increases

Engineering Contradiction:

Improvedecoding accuracyVSAvoidtransmission overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The decoder independently derives the intra prediction mode using already decoded neighboring pixels and DIMD parameters, without requiring the encoder to explicitly signal the prediction mode. This self-service mechanism reduces transmission overhead while maintaining decoding accuracy through collaborative derivation between encoder and decoder.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

DIMD parameters serve as intermediaries that bridge the encoder and decoder. Instead of directly transmitting the intra prediction mode, the system transmits DIMD parameters that enable both sides to derive the same prediction mode independently, reducing the amount of information that needs to be transmitted while ensuring consistent decoding.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If more intra prediction modes are supported, then coding flexibility is improved, but processing complexity increases

Engineering Contradiction:

Improvecoding flexibilityVSAvoidprocessing complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The intra prediction process is segmented into two independent parts: DIMD parameter derivation and intra prediction mode derivation. This segmentation allows the system to support multiple prediction modes without increasing overall processing complexity, as each block can independently determine its prediction mode based on its specific DIMD parameters and neighboring pixel characteristics.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12563226B2Intra prediction method and device based on intra prediction mode derivation

Publication Date: 2026.02.24 LG ELECTRONICS INC

AI summary

According to one embodiment of the present document, a method by which a decoding device decodes an image is provided. The method comprises the steps of: acquiring, from a bitstream, image information including decoder side intra mode derivation (DIMD)-related information; determining whether a DIMD mode is applied to the current block on the basis of the DIMD-related information; deriving an intra prediction mode for the current block on the basis of the determined result; and generating prediction samples for the current block on the basis of the intra prediction mode.