Decoder-Side Intra Prediction With Plurality DIMD Modes

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Solution Overview

Problem

The increasing demand for high-resolution, high-quality video and immersive media formats such as VR and AR content necessitates more efficient image compression techniques to reduce transmission and storage costs while maintaining or improving prediction accuracy.

Innovation Solution

The method involves deriving intra prediction modes using Decoder side Intra Mode Derivation (DIMD) based on information from a bitstream, reducing the need for signaling intra prediction modes and enhancing coding efficiency by using weighted averages of prediction samples.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If traditional intra prediction mode signaling is used, then prediction accuracy can be maintained, but bitstream overhead increases

Engineering Contradiction:

Improvebitstream overheadVSAvoidprediction accuracy

Core Design Contradiction:

Loss of informationVSMeasurement precision

Solution Approach 1:

The decoder derives intra prediction modes autonomously using already decoded neighboring pixels without requiring explicit mode signaling from the bitstream. The decoder self-determines the prediction mode based on local pixel characteristics and neighboring block information, eliminating the need for overhead-consuming mode signaling while maintaining prediction accuracy through intelligent mode derivation.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent copies the intra prediction mode from neighboring blocks (left, top, or top-left) and adapts it for the current block. By deriving the prediction mode from already-coded neighboring blocks rather than signaling it explicitly, the system reduces bitstream overhead while preserving prediction accuracy through mode inheritance and adaptation mechanisms.

Inventive Principle:

Principle #26Copying

2Productivity

If DIMD mode is applied to all blocks, then coding efficiency improves, but complexity of mode derivation increases

Engineering Contradiction:

Improvecoding efficiencyVSAvoidmode derivation complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies DIMD mode selectively based on local block characteristics rather than uniformly to all blocks. The decoder determines whether to apply DIMD derivation based on factors such as block size, neighboring block availability, and local image characteristics, optimizing coding efficiency for suitable blocks while avoiding unnecessary complexity for blocks where traditional signaling remains more appropriate.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system dynamically adapts the prediction mode derivation process based on local conditions. The decoder flexibly switches between DIMD mode derivation and traditional signaled modes depending on the specific block characteristics, neighboring block properties, and coding context, creating a dynamic and adaptive coding strategy that balances efficiency and complexity.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12413776B2Method and device for intra prediction based on plurality of DIMD modes

Publication Date: 2025.09.09 LG ELECTRONICS INC

AI summary

According to one embodiment of the present specification, provided is an image decoding method performed by a decoding device. The method comprises the steps of: acquiring, from a bitstream, image information comprising information related to decoder-side intra mode derivation (DIMD); determining, on the basis of the information related to DIMD, whether DIMD is applied to a current block; deriving DIMD modes for the current block on the basis that DIMD is applied to the current block; and generating a prediction sample for the current block on the basis of the DIMD modes.