Reference Picture List Signaling for Low-Overhead Video Decoding
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Solution Overview
Problem
Existing video coding technologies face challenges in efficiently managing reference picture lists, leading to inefficiencies in the coding process and increased data requirements, particularly in limited bandwidth scenarios.
Innovation Solution
The method involves parsing a slice header to derive a reference picture list structure, ensuring the order of entries in the list matches the order of corresponding reference pictures, and utilizing flags and parameters to optimize the signaling of reference picture lists, particularly for P and B slices, thereby simplifying and enhancing the coding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference picture lists are signaled with detailed structures and flags for each entry, then the precision of reference picture selection is improved, but the data requirements and signaling overhead increase
Solution Approach 1:
The reference picture list signaling is segmented into two parts: a base structure that is always present, and optional supplemental information that is only included when needed. The slice header contains a reference picture list structure with basic entries, and additional flags or parameters are only signaled when they provide beneficial precision, thereby reducing overall data requirements while maintaining selection precision where necessary.
Solution Approach 2:
Instead of always signaling complete reference picture list information with all possible flags and parameters, the patent applies partial action by only signaling the necessary portion of reference picture list data for each slice. The decoder reconstructs the reference picture list using default values for unsignaled parameters, reducing data requirements while maintaining adequate precision for inter prediction.
2Manufacturing precision
If complex reference picture list structures with multiple flags and parameters are used, then the coding precision is improved, but the device complexity increases
Solution Approach 1:
The coding device complexity is reduced by segmenting the reference picture list processing into modular components: a base processing path that handles all slices using a standardized reference picture list structure, and optional enhancement paths that are only activated when specific flags are set. This modular segmentation allows the device to maintain coding precision where needed while avoiding unnecessary complexity in routine operations.
Solution Approach 2:
The patent applies local quality by making the reference picture list structure adaptive to local requirements. Different slices or different regions within slices can use enhanced reference picture list signaling with additional flags and parameters only where coding precision benefits are expected, while other regions use the simpler base structure, thereby balancing coding precision with device complexity.
3Manufacturing precision
If comprehensive reference picture list signaling is performed for all slices, then the coding accuracy is improved, but the processing time increases
Solution Approach 1:
The patent implements periodic action by applying comprehensive reference picture list signaling only periodically or selectively to certain slices rather than to all slices uniformly. The slice header contains indicators that determine whether enhanced reference picture list signaling is applied to the current slice, allowing the system to achieve coding accuracy where needed while reducing average processing time across the entire video sequence.
Solution Approach 2:
Instead of performing comprehensive reference picture list signaling for all slices, the patent applies partial action by signaling enhanced reference picture list information only for slices where it provides meaningful coding accuracy improvement. The decoder uses default or inherited reference picture lists for slices where enhanced signaling is not present, thereby reducing processing time while maintaining coding accuracy where beneficial.
Data Source
AI summary
A method of decoding a coded video bitstream is provided. The method includes parsing a slice header of a current slice represented in the coded video bitstream. The slice header includes a reference picture list structure. The method also includes deriving, based on the reference picture list structure, a reference picture list of the current slice; and obtaining, based on the reference picture list, at least one reconstructed block of the current slice.