Intra-frame Chrominance Decoding Mode Reduction
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Solution Overview
Problem
The existing HEVC solution for intra-frame decoding of image blocks experiences high complexity due to the selection of prediction modes for chrominance components, which increases computational complexity and power consumption, especially in mobile devices.
Innovation Solution
The proposed method simplifies the prediction mode set for chrominance components by limiting it to only the DM mode and LM mode, eliminating redundant modes and using a single flag to indicate the prediction mode, thereby reducing decoding complexity and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a comprehensive prediction mode set including DM mode, LM mode, DC mode, Planar mode, Horizontal mode, and Vertical mode is used for chrominance component, then prediction accuracy is improved, but decoding complexity increases
Solution Approach 1:
The patent extracts and removes redundant prediction modes from the comprehensive set. Specifically, it eliminates DC mode, Planar mode, Horizontal mode, and Vertical mode from the chrominance component prediction mode set, retaining only DM mode and LM mode. This extraction principle reduces decoding complexity while maintaining essential prediction functionality.
Solution Approach 2:
The patent makes the chrominance component prediction mode set universal by making it consistent with the luminance component prediction mode set. Both components use the same prediction modes (DM mode and LM mode), simplifying the decoding process. The decoder can use the same prediction mode indication mechanism for both components, reducing overall system complexity.
2Adaptability or versatility
If multiple prediction modes are available for chrominance component, then coding flexibility is improved, but power consumption increases
Solution Approach 1:
The patent extracts only the essential prediction modes (DM mode and LM mode) needed for chrominance component coding, removing unnecessary modes. This reduces the computational burden during decoding, thereby lowering power consumption in mobile devices while retaining sufficient coding flexibility through the remaining modes.
3Measurement precision
If a large prediction mode set is used for intra-frame prediction, then prediction quality is improved, but coding time increases
Solution Approach 1:
The patent extracts and removes redundant prediction modes from the intra-frame prediction process for chrominance components. By eliminating DC mode, Planar mode, Horizontal mode, and Vertical mode, the coding time is reduced by approximately 10% while prediction quality is maintained through the retained DM mode and LM mode, which are sufficient for chrominance prediction needs.
Data Source
AI summary
Embodiments of the present invention provide an intra-frame decoding method and apparatus for a signal component sampling point of an image block. The method includes: obtaining prediction mode information about a first signal component of a current block from a video code stream; determining a prediction mode for the first signal component of the current block, where the prediction mode for the first signal component of the current block is one of a DM mode and an LM mode; obtaining a prediction value of a first signal component sampling point of the current block according to the prediction mode for the first signal component of the current block; and obtaining a reconstruction value of the first signal component sampling point of the current block. The technical solutions provided by the embodiments of the present invention reduce complexity of implementing a decoding end.