Image Chroma Block Direct Modes for Efficient Intra Prediction
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images leads to a significant increase in transmission and storage costs due to the rise in the amount of transmitted information, necessitating high-efficient image compression technologies.
Innovation Solution
An image encoding/decoding method that derives multiple direct modes for chroma blocks, determines one mode from both default and direct modes based on first information, and intra-predicts the chroma block using the determined mode, while adaptively applying direct modes based on tree types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-resolution and high-quality images are transmitted, then image quality is improved, but transmission cost and storage cost increase
Solution Approach 1:
The patent changes the parameter of chroma prediction by introducing multiple direct modes (DM0, DM1, DM2) with different derivation methods. Each mode uses different reference samples and calculation approaches, allowing the system to select the most efficient mode for each block, thereby improving compression efficiency while maintaining image quality
Solution Approach 2:
The patent dynamically selects among multiple chroma intra prediction modes based on block characteristics and tree type. The mode selection is not fixed but adapts to different situations, allowing the system to optimize the balance between image quality and transmission efficiency for each specific block
2Manufacturing precision
If multiple direct modes are derived for chroma blocks, then chroma intra prediction performance is improved, but encoding complexity increases
Solution Approach 1:
The patent segments the chroma prediction process into multiple distinct modes (DM0, DM1, DM2), each handling different prediction scenarios. This segmentation allows the encoder to choose the most appropriate mode for each block, improving prediction performance while managing complexity through organized mode selection
Solution Approach 2:
The patent derives multiple direct modes beyond the traditional single mode, providing more prediction options than strictly necessary. This excessive action improves prediction accuracy by having more candidates to choose from, while the actual encoding complexity is managed by selecting only the best mode for each block
3Adaptability or versatility
If default modes and direct modes are combined, then mode selection flexibility is improved, but overlap between modes creates redundancy
Solution Approach 1:
The patent extracts and removes overlapping modes from the combined set of default modes and direct modes. By identifying and eliminating redundant modes, the system maintains flexibility in mode selection while avoiding the inefficiency of transmitting information for modes that would never be selected due to overlap
Data Source
AI summary
An image encoding/decoding method, a bitstream transmission method, and a computer-readable recording medium for storing a bitstream are provided. The image decoding method according to the present disclosure is an image decoding method performed by an image decoding device, and may comprise deriving multiple direct mode (DM) candidates for a chroma block; determining one mode among default modes and the multiple DM candidates for the chroma block on the basis of first information obtained from a bitstream; and intra-predicting the chroma block on the basis of the determined mode.