Long-Term Reference Picture Signaling in Video Coding
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Solution Overview
Problem
Current systems for representing and processing digital media face challenges in efficiently encoding and decoding high-quality media due to increased complexity and bit overhead, particularly in managing long-term reference pictures for inter prediction.
Innovation Solution
The development of an electronic device capable of decoding and encoding long-term reference picture sets, utilizing a long-term reference picture indicator, the number of long-term reference pictures, least significant bit (LSB) values of the absolute Picture Order Count (POC), and used by current picture flags to determine the utilization of long-term reference pictures for inter prediction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If long-term reference pictures are used for inter prediction, then prediction accuracy is improved, but bit overhead and system complexity increase
Solution Approach 1:
The patent segments the reference picture management into distinct categories: long-term reference pictures and short-term reference pictures. This segmentation allows the system to maintain prediction accuracy through long-term references while reducing complexity by managing short-term references separately with simpler mechanisms, thus resolving the contradiction between prediction accuracy and system complexity.
Solution Approach 2:
The patent applies different management strategies to different types of reference pictures based on their local characteristics. Long-term reference pictures use absolute POC indexing for accurate identification, while short-term reference pictures use relative indexing. This local differentiation optimizes both prediction accuracy for long-term references and system complexity for short-term references.
2Measurement precision
If absolute Picture Order Count (POC) values are used to identify long-term reference pictures, then picture identification accuracy is improved, but bit overhead increases
Solution Approach 1:
The patent segments the reference picture identification into two approaches: absolute POC identification for long-term references (where accuracy is critical) and relative identification for short-term references (where bit efficiency is prioritized). This segmentation allows the system to use absolute POC only where necessary, reducing overall bit overhead while maintaining identification accuracy for long-term references.
Solution Approach 2:
The patent applies absolute POC identification partially - only to long-term reference pictures - rather than universally to all reference pictures. This partial application reduces the total bit overhead while maintaining sufficient identification accuracy for the specific use case of long-term references, avoiding excessive action on short-term references where absolute precision is less critical.
Data Source
AI summary
A method for sending a long-term reference picture indicator by an electronic device is described. A long-term reference picture indicator is generated. The long-term reference picture indicator is sent. An absolute Picture Order Count (POC) corresponding to a long-term reference picture is generated. The absolute POC includes a least significant bit (LSB) value. The LSB value of the absolute POC corresponding to a long-term reference picture is sent. A used by current picture flag corresponding to a current picture is generated. The used by current picture flag in at least one parameter set is sent.