Video Intra-Prediction Coding with Shared Luma-Chroma Matrices
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Solution Overview
Problem
The increasing volume and complexity of video data due to higher picture sizes, resolutions, and frame rates necessitate improved compression techniques with better encoding efficiency and image quality than existing methods like H.264/AVC and HEVC.
Innovation Solution
Intra-prediction coding techniques are enhanced by using matrix-based intra prediction (MIP) for both luma and chroma components, with adaptations for different sampling formats and shared matrices and offsets, and efficient signaling methods for MIP modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If matrix-based intra prediction (MIP) is applied to both luma and chroma components, then prediction performance and encoding efficiency are improved, but implementation complexity increases
Solution Approach 1:
The patent merges the MIP processing for luma and chroma components by using shared matrix structures and unified processing pathways. The same matrix-based prediction methodology is applied to both color components, consolidating the implementation approach and reducing overall system complexity while maintaining improved encoding efficiency.
Solution Approach 2:
The patent creates a universal MIP framework that handles both luma and chroma prediction through common matrix operations. The matrix-based prediction engine serves multiple functions by processing different color components with the same underlying methodology, reducing the need for separate dedicated processing paths.
2Measurement precision
If MIP modes are signaled for chroma blocks, then prediction accuracy improves, but bitstream overhead increases
Solution Approach 1:
The patent extracts and removes redundant MIP mode signaling for chroma blocks by deriving chroma MIP modes from luma MIP modes. Instead of signaling separate MIP mode information for chroma, the system extracts chroma prediction parameters from the already-signaled luma MIP mode, eliminating unnecessary bitstream overhead while preserving prediction accuracy.
Solution Approach 2:
The patent uses copying by deriving chroma MIP mode information from luma MIP mode information. The chroma component copies the MIP mode selection and parameters from the luma component, avoiding duplicate signaling and reducing bitstream overhead while maintaining consistent prediction quality across color channels.
3Measurement precision
If separate MIP matrices are used for luma and chroma, then prediction precision is improved, but memory requirements and processing complexity increase
Solution Approach 1:
The patent merges the MIP matrix storage for luma and chroma components by implementing shared matrix structures. Instead of maintaining separate matrix copies for each color component, the system uses a single set of MIP matrices that serve both luma and chroma prediction, significantly reducing memory requirements while maintaining prediction precision through unified matrix operations.
Data Source
AI summary
A method and an apparatus are configured for intra prediction coding of video data. An apparatus for decoding video data includes: a decoding unit which obtains, from a bitstream, information on a luma prediction mode and information on a chroma prediction mode of a current coding block; and an intra prediction unit which generates luma prediction samples and chroma prediction samples of the current coding block. The intra prediction unit derives a luma intra prediction type and a luma intra prediction mode of the current coding block on the basis of the information on the luma prediction mode, and determines a chroma intra prediction mode of the current coding block on the basis of the luma intra prediction type and the luma intra prediction mode of the current coding block, and the information on the chroma prediction mode.