Reference Picture List Switching in Slice-Adaptive Video Decoding
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Solution Overview
Problem
Existing video encoding and decoding technologies struggle to efficiently manage reference picture lists, leading to inefficiencies in handling diverse video qualities and network environments, particularly in high-definition and ultrahigh-definition video services.
Innovation Solution
A method and apparatus for signaling and modifying reference picture list information in a bitstream, using picture parameter sets to determine whether the same reference picture list is applied to slices and if additional modifications are needed, allowing for dynamic construction based on picture characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same reference picture list is applied to all slices in a picture, then decoding complexity is reduced, but adaptability to different slice characteristics is worsened
Solution Approach 1:
The patent introduces a dynamic mechanism where the reference picture list construction mode can be flexibly switched between picture-level and slice-level based on signaling information. This allows the system to adapt its complexity to the actual content requirements, resolving the contradiction between fixed low-complexity mode and flexible high-adaptability mode.
Solution Approach 2:
The patent changes the parameter of reference picture list construction granularity from fixed (either picture-level or slice-level) to variable, controlled by signaling flags. This enables the system to adjust the reference picture list construction approach according to different picture and slice characteristics, balancing complexity and adaptability.
2Measurement precision
If additional information on modification of reference picture list is signaled, then precision of reference picture selection is improved, but bitstream overhead increases
Solution Approach 1:
The patent extracts only the necessary modification information from the full reference picture list construction process. Instead of signaling complete reference picture lists, it signals only the modification flags and differential information, reducing bitstream overhead while maintaining precision where needed.
Solution Approach 2:
The patent applies partial signaling by only transmitting modification information when actually needed (controlled by flags). When no modification is required, no additional bits are transmitted, thus avoiding unnecessary overhead while maintaining the capability for precise reference picture selection when required.
3Adaptability or versatility
If reference picture list is constructed by each slice, then adaptability to slice characteristics is improved, but decoding complexity increases
Solution Approach 1:
The patent implements a dynamic construction approach where the reference picture list can be constructed at picture-level or slice-level depending on signaling information. This dynamic switching allows the system to achieve slice-level adaptability only when necessary, thereby managing decoding complexity effectively.
Solution Approach 2:
The patent creates a universal reference picture list construction mechanism that can function at both picture-level and slice-level. This multi-functional approach allows the same decoding infrastructure to handle both construction modes, reducing the complexity increase that would result from implementing separate dedicated mechanisms for each mode.
Data Source
AI summary
Disclosed is a video decoding method that decodes a bitstream, the method including receiving a picture parameter set (PPS) comprising at least one of first information indicating whether the same reference picture list is applied to slices comprised in a picture and second information indicating whether additional information on modification of the reference picture list is present, and deriving a construction of the reference picture list based on the PPS. Accordingly, there are provided a method and an apparatus for signaling by a picture whether the construction of the reference picture list is modified when constructing the reference picture list.