Reference Picture List Management in the Decoded Picture Buffer
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Solution Overview
Problem
Existing video coding technologies face challenges in efficiently managing reference pictures, leading to inefficiencies in compression and decompression processes, particularly in limited bandwidth scenarios.
Innovation Solution
The method involves constructing and managing reference picture lists by marking the status of reference pictures in a decoded picture buffer as used for short-term or long-term reference, simplifying the signaling process and improving the overall coding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference picture lists are managed with detailed status marking for each picture, then reference picture management accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments reference picture management into two distinct lists: short-term reference picture list and long-term reference picture list. This segmentation allows precise tracking of reference picture status without requiring complex marking mechanisms across a single unified structure, thereby improving management accuracy while controlling complexity.
Solution Approach 2:
The patent implements dynamic list management where reference pictures are automatically added to or removed from short-term and long-term lists based on picture decoding order and reference needs. This dynamic approach replaces static detailed status marking with flexible list operations, maintaining accuracy while reducing complexity.
2Manufacturing precision
If more reference pictures are maintained in the decoded picture buffer, then image quality is improved, but memory resources are consumed
Solution Approach 1:
The patent implements automatic removal of pictures from the short-term reference picture list when they are no longer needed for reference, while maintaining them in the long-term reference picture list when needed. This discarding and recovering mechanism optimizes memory usage by keeping only necessary reference pictures in each list, improving image quality without excessive memory consumption.
Solution Approach 2:
The patent uses dynamic list management where the composition of short-term and long-term reference picture lists changes based on decoding progress and reference requirements. This allows the system to adapt memory allocation to actual needs, maintaining high image quality while efficiently utilizing limited memory resources.
3Productivity
If reference picture status is frequently updated during decoding, then coding efficiency is improved, but processing time increases
Solution Approach 1:
The patent performs preliminary organization of reference pictures into short-term and long-term lists during the decoding process, so that subsequent reference operations can proceed efficiently without requiring frequent status updates. This preliminary action reduces the number of status change operations needed, improving coding efficiency while minimizing processing time overhead.
Data Source
AI summary
A method of decoding a coded video bitstream. The method includes obtaining a first reference picture list of a current slice represented in the coded video bitstream and a second reference picture list of the current slice, and marking a status of a reference picture in a decoded picture buffer (DPB) based on the first reference picture list and the second reference picture list when the current slice is a first slice in a current picture to which the current slice belongs. The status of the reference picture in the decoded picture buffer is used for short-term reference, used for long-term reference, or unused for reference. The method also includes using the reference picture in a reconstructing process of the current picture or a picture following the current picture when the status of the reference picture is used for short-term reference or used for long-term reference.