Reference Picture Tracking in Video Decoding via Cycle Parameters
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Solution Overview
Problem
Existing methods for tracking reference pictures in electronic devices face challenges such as high overhead in signaling long-term reference pictures, ambiguity in picture identification due to POC wrap-around, and reliance on information from previous pictures, which can lead to errors and increased bit requirements.
Innovation Solution
The systems and methods described utilize a cycle parameter and modified buffer descriptions to track reference pictures with reduced overhead, including the use of a poc_cycle parameter and explicit signaling of wrap indicators, allowing for efficient identification and management of reference pictures within the decoded picture buffer (DPB) without relying on previous picture information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If absolute long-term picture referencing is used, then reference picture tracking is achieved, but overhead for signaling is high
Solution Approach 1:
The patent changes the parameter representation from absolute POC values to relative POC differences (delta POC). Instead of signaling the absolute position of reference pictures, the system signals the difference between consecutive reference picture positions, significantly reducing the number of bits required while maintaining the ability to track reference pictures accurately through cumulative calculation.
Solution Approach 2:
The patent segments the reference picture buffer into multiple regions or groups, allowing independent tracking and management of different reference picture sets. This segmentation enables more efficient signaling by only transmitting changes within specific segments rather than the entire buffer, reducing overall signaling overhead.
2Duration of action of stationary object
If POC wrap-around is used, then picture identification continues indefinitely, but ambiguity in picture identification occurs
Solution Approach 1:
The patent introduces an intermediary reference system using picture order count differences (delta POC) as a mediator between the wrapping POC values and the actual picture identification. This intermediary allows the system to handle POC wrap-around gracefully by calculating reference picture positions relative to the current picture, eliminating ambiguity even when absolute POC values wrap.
3Stability of the object's composition
If information from previous pictures is relied upon, then reference tracking is maintained, but errors propagate and bit requirements increase
Solution Approach 1:
The patent performs preliminary calculation and validation of POC differences before they are used for reference picture tracking. By pre-computing and verifying delta POC values, the system ensures that error propagation is prevented while maintaining continuous reference tracking. This preliminary action allows the decoder to detect and correct potential errors before they affect the reference picture buffer.
Data Source
AI summary
A method for tracking a reference picture on an electronic device is described. The method includes receiving a bitstream. The method also includes decoding a portion of the bitstream to produce a decoded reference picture. The method further includes tracking the decoded reference picture in a decoded picture buffer (DPB) with reduced overhead referencing based on a designated picture. The method additionally includes decoding a picture based on the decoded reference picture.