Intra Prediction for Luma-Chroma Blocks Using Adaptive MPM Division
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Solution Overview
Problem
Existing image compression technologies face challenges in accurately and efficiently determining intra prediction modes for luma and chroma blocks, particularly in high-resolution and high-quality images, and there is a need for improved methods and apparatuses to enhance intra prediction efficiency.
Innovation Solution
The method and apparatus determine intra prediction modes for luma and chroma blocks using an MPM list and MPM index, perform adaptive block division, and utilize inter-components reference for chroma blocks, enhancing prediction accuracy and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If intra prediction mode is derived separately for luma and chroma blocks, then prediction accuracy is improved, but device complexity increases
Solution Approach 1:
The patent divides the current block into multiple sub-blocks and derives intra prediction modes separately for each sub-block rather than for the entire block. This segmentation allows for more accurate local prediction while managing complexity through localized processing. The MPM list is constructed and applied at the sub-block level, enabling precise prediction adaptation to local image characteristics.
Solution Approach 2:
The patent applies different intra prediction modes to different regions (sub-blocks) of the current block based on local characteristics. By deriving MPM lists and selecting prediction modes independently for each sub-block, the system achieves local optimization of prediction accuracy without uniformly increasing complexity across the entire block.
2Productivity
If MPM list is shared among multiple lower coding blocks, then encoding efficiency is improved, but prediction precision deteriorates
Solution Approach 1:
The patent implements a dynamic approach where the MPM list can be shared among multiple lower coding blocks when beneficial for encoding efficiency, but can also be individually constructed when prediction precision requires it. The system adaptively determines whether to share or separately construct MPM lists based on the specific characteristics and requirements of each coding block, balancing efficiency and precision dynamically.
3Productivity
If block division is performed adaptively, then intra prediction efficiency is improved, but device complexity increases
Solution Approach 1:
The patent performs adaptive block division by dividing the current block into multiple sub-blocks based on local characteristics. This segmentation enables more efficient intra prediction by allowing different prediction modes to be applied to different sub-blocks, improving overall prediction efficiency while managing complexity through structured subdivision.
Solution Approach 2:
The patent performs block division and MPM list construction as preliminary actions before actual intra prediction. By pre-processing the block structure and preparing prediction mode lists in advance, the system optimizes the subsequent prediction process, improving efficiency while organizing complexity into manageable preparatory steps.
Data Source
AI summary
The image encoding/decoding method and device according to the present invention may determine an intra prediction mode of a current block and perform intra prediction on the current block on the basis of the intra prediction mode, wherein the intra prediction mode of the current block is determined for each of a luminance block and a color difference block.