Inter-prediction parameter derivation for video encoding
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Solution Overview
Problem
Existing video encoding and decoding technologies face challenges in achieving high compression efficiency due to limitations in predicting and transforming video content, particularly in deriving effective inter-prediction parameters for merge candidates.
Innovation Solution
The method involves deriving an inter-prediction parameter based on first and second merge candidates used to generate a pairwise merge candidate, which includes indices for weighted bi-prediction or interpolation filter indices, and using these parameters for encoding and decoding picture information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional inter-prediction parameter derivation methods are used for merge candidates, then the encoding process is simple, but compression efficiency is limited
Solution Approach 1:
The patent applies self-service by deriving inter-prediction parameters automatically from available merge candidate information without requiring external input or complex manual configuration. The encoder and decoder independently derive the same parameters from the bitstream and reference picture data, enabling autonomous operation while improving compression efficiency through optimized prediction parameter selection.
Solution Approach 2:
The patent implements preliminary action by pre-deriving inter-prediction parameters from merge candidates before the actual encoding/decoding process. The parameters including motion vectors, reference picture indices, and prediction modes are prepared in advance from available reference data, allowing the main encoding process to proceed efficiently without real-time parameter calculation overhead.
2Measurement precision
If advanced inter-prediction parameters are derived for pairwise merge candidates, then prediction accuracy improves, but computational complexity increases
Solution Approach 1:
The patent applies parameter changes by dynamically selecting and deriving inter-prediction parameters based on the specific characteristics of pairwise merge candidates. Different parameter sets including motion vectors, reference picture indices, and prediction modes are chosen and derived according to the candidate type and available reference data, optimizing prediction accuracy while adapting computational requirements to the specific encoding context.
3Manufacturing precision
If more inter-prediction parameters are encoded, then reconstruction quality improves, but bitstream size increases
Solution Approach 1:
The patent extracts only the essential inter-prediction parameters from the available merge candidate information and encodes them in the bitstream. By selecting and encoding only the most critical parameters such as motion vector differences and reference picture indices while deriving other parameters at the decoder side, the patent reduces bitstream overhead while maintaining reconstruction quality through efficient parameter selection and derivation.
Data Source
AI summary
Video processing such as encoding and/or decoding a picture can involve deriving an inter-prediction parameter based on first and second merge candidates used to generate a pairwise merge candidate, wherein the inter-prediction parameter comprises at least one of an index for weighted bi-prediction or an interpolation filter index; and encoding at least a portion of the picture information based on the inter-prediction parameter.