Reference Picture Buffer Signaling for Long-Term Video Coding
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Solution Overview
Problem
Existing video coding schemes suffer from decreased coding efficiency due to redundant information in specifying long-term reference pictures and the use of large bit values for unique picture numbers, particularly in managing reference pictures in the decoded picture buffer.
Innovation Solution
An image coding method that writes buffer description defining information, including long-term information, into a sequence parameter set, and specifies a reference picture to be assigned as a long-term reference picture in the header, reducing redundant information and improving coding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If buffer description defining information is written into sequence parameter set, then coding efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments the buffer description information into different locations: sequence parameter set for long-term reference picture specification and picture parameter set for short-term reference picture specification. This segmentation allows efficient coding by placing different types of information in appropriate locations, improving coding efficiency while managing complexity through structured organization.
Solution Approach 2:
The patent performs preliminary action by writing buffer description defining information into the sequence parameter set in advance, before picture-level processing. This preliminary configuration establishes the long-term reference picture structure once, reducing redundant information and improving coding efficiency for subsequent pictures without requiring repeated specification at each picture level.
2Productivity
If long-term information is included in buffer description, then coding efficiency is improved, but loss of information increases
Solution Approach 1:
The patent extracts the long-term reference picture specification from the picture-level buffer description and places it in the sequence parameter set. This extraction removes redundant information from repeated picture descriptions, improving coding efficiency by avoiding redundant long-term reference specifications while maintaining necessary information through the sequence-level definition.
Solution Approach 2:
The sequence parameter set serves multiple functions: it defines buffer descriptions for long-term reference pictures and provides picture parameter set information. This multi-functionality reduces the need for separate dedicated structures, improving coding efficiency by consolidating information while maintaining completeness through the universal sequence parameter set.
3Productivity
If buffer description is selected for each processing unit, then coding efficiency is improved, but device complexity increases
Solution Approach 1:
The patent introduces dynamic selection of buffer descriptions at the picture parameter set level, allowing flexible choice of which buffer description to apply to each picture. This dynamic mechanism improves coding efficiency by adapting reference picture selection to specific picture requirements while managing complexity through a standardized selection process at the picture parameter set level.
Data Source
AI summary
An image coding method includes: writing, into a sequence parameter set, buffer description defining information for defining a plurality of buffer descriptions; selecting one of the buffer descriptions for each processing unit that is a picture or a slice, and writing buffer description selecting information for specifying the selected buffer description, into a first header of the processing unit which is included in the coded bitstream; and coding the processing unit using the selected buffer description, and the buffer description defining information includes long-term information for identifying, among a plurality of reference pictures indicated in the buffer descriptions, a reference picture to be assigned as a long-term reference picture.