Luma and Chroma Intra Prediction with Adaptive Block Division
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Solution Overview
Problem
Existing image compression technologies face challenges in accurately and efficiently deriving intra prediction modes for luma and chroma blocks, particularly in high-resolution and high-quality images, and in optimizing block division methods for improved prediction efficiency.
Innovation Solution
The method determines intra prediction modes for luma and chroma blocks based on an MPM list and MPM index, allows sharing of MPM lists among lower coding blocks, and performs adaptive block division based on block size and shape, with inter-components reference prediction using down-sampled luma regions for chroma blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If intra prediction mode is derived separately for each luma and chroma block, then prediction accuracy is improved, but device complexity and processing overhead increase
Solution Approach 1:
The current block is divided into multiple sub-blocks, and intra prediction mode is derived for each sub-block separately. This segmentation allows the patent to improve prediction accuracy by adapting to local variations within the block while managing complexity through systematic processing of smaller units.
Solution Approach 2:
The patent applies the same MPM list derivation mechanism to both luma and chroma blocks, creating a universal process that handles different block types. This multi-functionality approach improves prediction accuracy for both component types while avoiding the need for separate complex processing paths.
2Productivity
If MPM list is shared among multiple lower coding blocks, then processing efficiency is improved, but prediction accuracy may deteriorate
Solution Approach 1:
The patent dynamically determines whether to share the MPM list among lower coding blocks based on specific conditions. The MPM list can be shared when blocks have similar characteristics, improving efficiency, while allowing separate derivation when blocks require different prediction modes, maintaining accuracy.
Solution Approach 2:
Different lower coding blocks within the same higher coding block can have different MPM list configurations. The patent allows each block to have customized MPM lists when needed, while permitting sharing when appropriate, thus balancing local prediction accuracy with overall processing efficiency.
3Productivity
If block division is performed based on size and shape, then prediction efficiency is improved, but device complexity increases
Solution Approach 1:
The patent divides the current block into multiple sub-blocks based on size and shape characteristics, enabling more efficient prediction by adapting to the specific geometry of each sub-block. This segmentation strategy improves prediction efficiency while managing complexity through rule-based division.
Solution Approach 2:
The patent changes the parameters used for block division based on the size and shape of the current block. By adapting division parameters to block characteristics, the patent improves prediction efficiency without requiring complex fixed-structure division mechanisms.
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.