Intra Sub-Partition Prediction for VPDU-Aligned Image Coding
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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
The implementation of Intra Sub-Partitions (ISP) in image coding systems, applied to blocks smaller than or equal to the size of a Virtual Pipeline Data Unit (VPDU), considering the decoding pipeline for hardware implementation, to enhance image coding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-resolution and high-quality images are transmitted or stored, then image quality is improved, but transmission cost and storage cost increase
Solution Approach 1:
The current block is divided into multiple sub-partitions (e.g., 2x2, 4x4, or 4x2 partitions) for independent intra prediction processing. This segmentation allows more flexible and accurate prediction by adapting to local image characteristics in different regions, thereby improving compression efficiency without sacrificing image quality
Solution Approach 2:
Different intra prediction modes are applied to different sub-partitions based on local image characteristics. Each sub-partition can use the most suitable prediction mode (e.g., planar, angular, or DC mode) according to its local features, achieving better compression performance while maintaining high image quality
2Productivity
If Intra Sub-Partitions (ISP) are applied to blocks larger than VPDU size, then image coding efficiency is improved, but VPDU processing becomes misaligned
Solution Approach 1:
The patent segments the current block into sub-partitions with sizes that are multiples of the VPDU size (e.g., 64x64, 128x64, or 128x128). This segmentation strategy ensures that each sub-partition can be processed independently by the hardware pipeline without misalignment, while still achieving the compression benefits of ISP
Solution Approach 2:
The patent changes the partitioning parameters to ensure sub-partition dimensions are compatible with VPDU size requirements. By adjusting the segmentation strategy to produce sub-partitions that are integer multiples of VPDU dimensions, the system maintains both coding efficiency and hardware processing alignment
3Measurement precision
If ISP is applied without considering VPDU size constraints, then intra prediction accuracy is improved, but hardware implementation complexity increases
Solution Approach 1:
The patent segments the block into sub-partitions that align with VPDU boundaries, enabling independent hardware pipeline processing. This segmentation maintains prediction accuracy by allowing mode-specific optimization while simplifying hardware implementation through standardized processing units
Solution Approach 2:
The patent creates a universal processing framework where sub-partitions are designed to be compatible with standard VPDU dimensions. This multi-functionality allows the same hardware pipeline to process different block sizes and prediction modes without requiring specialized processing paths, reducing overall system complexity
Data Source
AI summary
A method by which a decoding device decodes an image, according to the present document, comprises the steps of: receiving prediction mode information about a current block; receiving intra sub-partitions (ISP)-related information about the current block on the basis of the size and the maximum conversion block size of the current block; deriving an intra prediction mode of the current block on the basis of the prediction mode information; and generating a prediction sample of the current block on the basis of the intra prediction mode and the ISP-related information.