Restricting EoB NAL Layer IDs for Accurate Inter-Layer Reference Picture Positioning
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Solution Overview
Problem
In multi-layer video coding schemes, End of Bitstream (EoB) Network Access Layer (NAL) units and Reference Picture Sets (RPS) are often dropped or processed incorrectly due to unrestricted layer identifiers, leading to incorrect bitstream decoding and incorrect positioning of inter-layer reference pictures.
Innovation Solution
Restricting the layer identifiers of EoB NAL units to zero and correctly inserting 'no reference picture' entries into the RPS inter-layer subsets based on the view identifier of the current picture to prevent incorrect processing and ensure correct decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If layer identifiers of EoB NAL units are unrestricted, then multi-layer coding flexibility is improved, but EoB NAL units are dropped or processed incorrectly leading to decoding errors
Solution Approach 1:
The patent changes the parameter of layer identifier restriction for EoB NAL units. By restricting the layer identifier to a specific value (e.g., base layer identifier), the patent ensures that EoB NAL units are correctly identified and processed during decoding, preventing them from being dropped or misprocessed while maintaining multi-layer coding functionality through proper reference picture set management.
Solution Approach 2:
The patent introduces an intermediary mechanism through the reference picture set (RPS) management. By correctly inserting 'no reference picture' entries into RPS inter-layer subsets based on view identifiers, the patent creates a mediating structure that ensures proper handling of EoB NAL units across different layers, preventing decoding errors while maintaining coding flexibility.
2Device complexity
If inter-layer reference pictures are not correctly positioned in RPS, then decoding complexity is reduced, but incorrect bitstream decoding occurs
Solution Approach 1:
The patent applies preliminary action by pre-establishing the correct positioning rules for inter-layer reference pictures in the reference picture set before decoding occurs. By defining clear rules for inserting 'no reference picture' entries based on view identifiers, the patent ensures that reference pictures are correctly positioned in advance, preventing decoding errors without increasing runtime decoding complexity.
3Loss of energy
If EoB NAL units are dropped due to unrestricted layer identifiers, then device resource usage is reduced, but video coding performance deteriorates
Solution Approach 1:
The patent enables self-service through proper EoB NAL unit handling. By restricting layer identifiers and implementing correct RPS management, the decoding process automatically and correctly processes EoB NAL units without requiring additional complex control mechanisms or increasing device resource usage, thereby maintaining video coding performance through reliable automatic handling.
Data Source
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AI summary
Methods for coding an inter-layer reference picture set (RPS) and coding end of bitstream (EoB) network access (NAL) units in multi-layer coding are disclosed. In one aspect, the method includes determining whether a candidate inter-layer reference picture is present in the video information. The video information includes an inter-layer RPS including a plurality of subsets. The method further includes determining an inter-layer RPS subset to which the candidate inter-layer reference picture belongs in response to determining that the candidate inter-layer reference picture is not present, and indicating that no reference picture is present in the inter-layer RPS subset to which the candidate inter-layer reference picture belongs.