Combined Intra-Inter Prediction for Video Coding Efficiency
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Solution Overview
Problem
Current video coding technologies face limitations in efficiently combining intra and inter prediction methods, leading to suboptimal compression ratios and increased bandwidth/storage requirements due to the lack of effective tools for weighting and transform techniques in inter prediction.
Innovation Solution
The implementation of combined intra/inter prediction (CIIP) and inter position-dependent prediction combination (PDPC) modes, which enable weighted bi-prediction, secondary transforms, and the disabling of certain tools like local illumination compensation, to enhance coding efficiency by combining intra and inter prediction techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional intra coding or separate intra/inter prediction methods are used, then the coding process is simple, but the compression ratio is suboptimal and bandwidth/storage requirements increase
Solution Approach 1:
The patent combines intra prediction and inter prediction into a unified combined intra/inter prediction (CIIP) mode. The decoder receives prediction information indicating a prediction mode that combines both intra prediction (based on reference samples in the current picture) and inter prediction (based on reference samples in a reference picture). This merging allows the system to achieve higher compression ratios by leveraging the strengths of both prediction methods simultaneously, rather than choosing one or the other, thus resolving the contradiction between compression efficiency and method simplicity.
Solution Approach 2:
The patent implements dynamic selection and weighting of prediction modes through the CIIP and inter position-dependent prediction combination (PDPC) mechanisms. The system dynamically determines the optimal combination of intra and inter prediction based on the specific block being decoded, using prediction information from the coded video bitstream to adaptively adjust the prediction strategy. This dynamic approach allows the system to optimize compression ratio for each block while managing complexity through structured decision-making processes.
2Productivity
If more prediction tools and techniques are implemented, then coding efficiency improves, but device complexity and processing overhead increase
Solution Approach 1:
The patent segments the prediction process into distinct, manageable components: intra prediction generation, inter prediction generation, and combination weighting. The decoder determines coding tools associated with the prediction mode and reconstructs samples by applying the appropriate combination of these segmented tools. This segmentation allows complex prediction functionality to be implemented in a modular fashion, improving coding efficiency while managing device complexity through organized, step-by-step processing of each prediction component.
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. The processing circuitry decodes prediction information of a current block in a current picture from a coded video bitstream. The prediction information is indicative of a prediction mode that combines an intra prediction and an inter prediction. The intra prediction is based on at least a first reference sample in the current picture, and the inter prediction is based on at least a second reference sample in a reference picture of the current picture. Further, the processing circuitry determines coding tools associated with the prediction mode that combines the intra prediction and the inter prediction and reconstruct at least a sample of the current block according to the determined coding tools associated with the prediction mode.