Image Prediction Using Reference Pixels and Affine Sub-Blocks
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Solution Overview
Problem
Existing image compression technologies face challenges in efficiently performing intra prediction based on reference pixel availability, inter prediction in units of sub-blocks, and determining affine candidates.
Innovation Solution
The method involves checking a reference pixel region, determining a reference pixel processing setting based on availability, generating a candidate list for motion information prediction, deriving a control point vector, and performing intra and inter prediction using motion vectors, with affine candidates including spatial, temporal, and constructed candidates, and motion vectors derived in units of sub-blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If intra prediction is performed based on reference pixel availability, then coding performance is improved, but device complexity increases due to additional availability checking and processing setting determination
Solution Approach 1:
The patent checks reference pixel availability and determines processing settings in advance before performing intra prediction. This preliminary action allows the system to prepare the optimal prediction approach based on available reference data, improving coding efficiency without adding complex runtime decisions.
Solution Approach 2:
The patent dynamically adjusts the intra prediction processing based on the availability of reference pixels. The system adapts its prediction strategy according to the determined reference pixel processing setting, allowing flexible optimization of coding performance for different block types and reference availability scenarios.
2Measurement precision
If inter prediction is performed in units of sub-blocks with affine candidates, then inter prediction accuracy is improved, but encoding/decoding time increases due to additional candidate generation and motion vector derivation
Solution Approach 1:
The patent divides the current block into sub-blocks and performs inter prediction independently for each sub-block using affine motion models. This segmentation allows more precise motion compensation for different regions while maintaining manageable computational complexity through localized processing.
Solution Approach 2:
The patent changes the motion modeling parameters by introducing affine transformation parameters (control point vectors, motion vectors) that describe motion more accurately than traditional block-based methods. This parameter change enables higher prediction accuracy by modeling rotational, scaling, and shearing motions.
3Measurement precision
If multiple affine candidates including spatial, temporal, and constructed candidates are generated, then motion information prediction accuracy is improved, but device complexity increases due to expanded candidate list management
Solution Approach 1:
The patent merges multiple types of motion candidates (spatial, temporal, and constructed candidates) into a unified candidate list. This combination allows the system to leverage diverse motion information sources, improving prediction accuracy by selecting from a broader range of motion models.
Solution Approach 2:
The patent introduces constructed candidates as intermediary motion models that combine information from spatial and temporal neighbors. These constructed candidates act as mediators that synthesize motion information from multiple sources, providing additional accurate prediction options without requiring separate processing paths.
Data Source
AI summary
An image prediction method according to the present invention may comprise: identifying a reference pixel region designated for obtaining correlation information; determining a reference pixel processing configuration on the basis of determination of the availability of the reference pixel region; and performing intra prediction according to the determined reference pixel processing. As described above, performing intra prediction on the basis of the availability of a reference pixel according to the present invention can improve encoding performance.