Video Coding With Position-Dependent Prediction Combination
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Solution Overview
Problem
Existing video coding technologies face challenges in efficiently combining intra and inter prediction methods, particularly in scenarios where bi-directional optical flow refinement is not applicable, leading to suboptimal compression efficiency and increased bandwidth requirements.
Innovation Solution
The implementation of a position-dependent prediction combination (PDPC) that combines intra and inter prediction, utilizing flags to determine the usage of PDPC and applying filters on neighboring samples to reconstruct current blocks, while excluding bi-directional optical flow refinement when certain conditions are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bi-directional optical flow refinement is applied in inter prediction, then prediction accuracy is improved, but computational complexity and bandwidth requirements increase
Solution Approach 1:
The patent applies position-dependent prediction combination that selectively uses bi-directional optical flow refinement only for specific sample positions within a block rather than uniformly across all samples. This local application maintains prediction accuracy where needed while reducing overall computational complexity and bandwidth requirements.
2Productivity
If intra and inter prediction are combined, then compression efficiency is improved, but processing complexity increases
Solution Approach 1:
The patent implements a flag-based mechanism that enables position-dependent prediction combination only when beneficial, rather than applying it universally. This partial application maintains compression efficiency improvements while avoiding the processing complexity overhead in cases where the benefit would be minimal.
3Quantity of substance
If position-dependent prediction combination is applied, then bandwidth requirements are reduced, but filtering complexity increases
Solution Approach 1:
The patent modifies the prediction combination process by introducing position-dependent weighting parameters that are derived from neighboring sample values. This parameter change enables bandwidth reduction through more accurate prediction while managing filtering complexity through systematic parameter derivation rather than complex filtering operations.
Data Source
AI summary
Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for video decoding includes processing circuitry. For example, the processing circuitry decodes prediction information of a current block from a coded video bitstream. The prediction information indicates that a prediction of the current block is at least partially based on an inter prediction. Then, the processing circuitry reconstructs at least a sample of the current block as a combination of a result from the inter prediction and neighboring samples of the block that are selected based on a position of the sample.