BDPCM Intra Prediction Mapping for Efficient Image Decoding

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Solution Overview

Problem

The increasing demand for high-resolution and high-quality images leads to increased transmission and storage costs due to the higher amount of information required, necessitating a more efficient image compression technique.

Innovation Solution

Implementing Block-based Delta Pulse Code Modulation (BDPCM) to improve image coding efficiency by storing the intra prediction mode based on the BDPCM prediction direction as the intra prediction mode of the current block.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If high-resolution and high-quality images are transmitted or stored, then image quality is improved, but transmission cost and storage cost increase

Engineering Contradiction:

Improveimage qualityVSAvoidamount of data

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent extracts only the essential information for image reconstruction by using BDPCM to encode residual differences between predicted and actual pixel values. Instead of transmitting or storing complete high-resolution image data, only the differential residuals are encoded and stored, significantly reducing the data quantity while preserving image quality.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the parameter representation from storing actual pixel values to storing differential residuals. By transforming the data into a difference domain and applying BDPCM encoding, the patent reduces the amount of data required to represent the same image quality, effectively resolving the contradiction between image quality and data quantity.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If BDPCM is applied to current block, then coding efficiency is improved, but intra prediction mode accuracy may be compromised

Engineering Contradiction:

Improvecoding efficiencyVSAvoidintra prediction mode accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent performs preliminary action by storing the intra prediction mode derived from BDPCM direction flag before actual decoding. This pre-stored prediction mode is then used during decoding to reconstruct the current block, ensuring that both the coding efficiency benefits of BDPCM and the accuracy of intra prediction mode are maintained simultaneously.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces an intermediary mechanism where the BDPCM direction flag serves as a mediator between the BDPCM encoding process and the intra prediction mode selection. This intermediary allows the system to derive and store the appropriate intra prediction mode based on BDPCM direction, resolving the potential conflict between coding efficiency and prediction accuracy.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20260075243A1Image decoding method and device thereof

Publication Date: 2026.03.12 LG ELECTRONICS INC

AI summary

An image decoding method performed by a decoding device according to the present document comprises the steps of: acquiring a block-based delta pulse code modulation (BDPCM) flag for a current block; on the basis of the BDPCM flag indicating that BDPCM is applied to the current block, acquiring a BDPCM direction flag for the current block; and storing, as an intra-prediction mode of the current block, an intra-prediction mode of a prediction direction derived on the basis of the BDPCM direction flag.