Intra-Prediction Mode Derivation for Image Compression
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Solution Overview
Problem
Current image encoding/decoding techniques face inefficiencies in compressing high-resolution and high-quality image data, leading to increased transmission and storage costs due to the large amount of data required.
Innovation Solution
The method involves deriving the intra prediction mode of a current block using the intra prediction mode of adjacent neighbor blocks, constructing a Most Probable Mode (MPM) list, and performing intra prediction based on this mode, regardless of multi-reference sample line information, subblock partition prediction, and intra/inter combination prediction information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional image encoding techniques are used for high-resolution images, then image quality is maintained, but data volume increases leading to higher transmission and storage costs
Solution Approach 1:
The patent uses intra-prediction to create a copy of the current block from reference blocks, replacing the need to transmit actual pixel data. The decoder reconstructs the current block by copying and processing reference block data according to prediction modes, significantly reducing the amount of data that needs to be transmitted while maintaining image quality
Solution Approach 2:
The patent extracts only the essential information needed for reconstruction by transmitting prediction mode indicators and residual data rather than complete pixel values. The actual pixel data is extracted from reference blocks during decoding, separating the transmission of prediction parameters from the actual image content
2Productivity
If intra-prediction using neighbor blocks is implemented, then compression efficiency is improved, but the complexity of mode derivation increases
Solution Approach 1:
The patent performs preliminary action by pre-constructing an MPM list of most probable modes based on neighbor block prediction modes before the actual prediction process. This pre-computation of likely prediction modes simplifies the subsequent mode selection and derivation process, reducing the complexity of mode derivation while maintaining high compression efficiency
Solution Approach 2:
The patent changes parameters by dynamically adjusting the MPM list composition based on the specific prediction modes of neighbor blocks. The list is reconfigured according to the statistical properties and spatial relationships of adjacent blocks, optimizing the prediction process for different image regions and reducing overall computational complexity
Data Source
AI summary
Disclosed herein is a method of decoding an image including deriving intra prediction mode of a current block using an intra prediction mode of a neighbor block adjacent to the current block, constructing a reference sample of the current block, and performing intra prediction with respect to the current block using the intra prediction mode and the reference sample. The deriving of the intra prediction mode of the current block includes constructing a most probable mode (MPM) list based on whether the intra prediction mode of the current block is a Planar mode.