Image Decoding with BDPCM Direction-Based Intra Prediction

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Solution Overview

Problem

The increasing demand for high-resolution and high-quality images leads to a significant increase in 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, allowing accurate intra prediction and enhancing residual coding efficiency.

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 information

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The image block is divided into two separate prediction directions (horizontal and vertical), and BDPCM is applied independently in each direction. This segmentation allows the encoder to select the most efficient prediction direction for each block, reducing the overall bit rate while maintaining high image quality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the prediction parameter by using BDPCM direction flags to indicate whether horizontal or vertical prediction is applied. By dynamically selecting prediction directions and using delta pulse code modulation, the system achieves better compression efficiency without sacrificing image quality.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If BDPCM is applied to current block, then coding efficiency is improved, but additional flags and complexity are required

Engineering Contradiction:

Improvecoding efficiencyVSAvoidflag processing complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent merges the BDPCM application flag and the BDPCM direction flag into a unified signaling mechanism. The decoder processes these flags together to determine both whether BDPCM is applied and in which direction, reducing the overall complexity of flag processing while maintaining coding efficiency.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The intra prediction mode is automatically derived based on the BDPCM direction flag without requiring separate mode signaling. The system uses the BDPCM direction information to self-determine the appropriate intra prediction mode, reducing the complexity of mode selection while improving coding efficiency.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12501069B2Image decoding method and device thereof

Publication Date: 2025.12.16 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.