Sub-Block Intra Prediction for High-Resolution Image Compression
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Solution Overview
Problem
High-resolution and high-quality image data requires high-efficiency encoding/decoding techniques to reduce the increased costs of transmission and storage associated with conventional methods.
Innovation Solution
An image encoding/decoding method that utilizes intra prediction by dividing a current block into sub-blocks, deriving an intra prediction mode for each sub-block, and constructing reference samples to enhance compression efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional image encoding/decoding methods are used for high-resolution and high-quality images, then image quality and resolution are maintained, but transmission and storage costs increase significantly
Solution Approach 1:
The current block is divided into multiple sub-blocks, and intra prediction is performed separately for each sub-block. This segmentation allows for more precise local prediction, improving compression efficiency while maintaining high image quality, thereby reducing transmission and storage requirements
2Productivity
If intra prediction is performed on the entire current block without division, then encoding complexity is low, but compression efficiency is insufficient for high-resolution images
Solution Approach 1:
The current block is divided into multiple sub-blocks for separate intra prediction processing. This segmentation improves compression efficiency by capturing local variations in high-resolution images, while the division follows systematic patterns that manage encoding complexity
Solution Approach 2:
Different intra prediction modes are derived for different sub-blocks based on their local characteristics. This local quality approach allows each sub-block to be predicted with the most appropriate mode, improving overall compression efficiency for high-resolution images
3Loss of energy
If sub-block division is performed for intra prediction, then compression efficiency is improved, but encoding and decoding complexity increases
Solution Approach 1:
The current block is divided into sub-blocks with systematic patterns (e.g., horizontal or vertical division based on block size). This structured segmentation improves compression efficiency while keeping the division logic manageable and not excessively increasing complexity
Solution Approach 2:
Sub-block division is applied selectively based on block size and characteristics. Not all blocks are divided - only those where division provides significant compression benefit, thus improving efficiency without unnecessarily increasing complexity for all cases
Data Source
AI summary
The present invention relates to an image encoding/decoding method and apparatus. An image decoding method performing intra prediction according to the present invention may comprise dividing a current block into at least one sub-block; deriving an intra prediction mode for the at least one sub-block; constructing a reference sample for the intra prediction; and performing intra prediction for the at least one sub-block based on the derived intra prediction mode.