Video Coding APS Types for Independent ALF and LMCS Updates
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Solution Overview
Problem
Existing video coding systems inefficiently manage adaptive loop filter (ALF) and luma mapping with chroma scaling (LMCS) parameters, leading to redundant coding and resource wastage due to signaling these parameters across multiple pictures, thereby increasing network, memory, and processing requirements.
Innovation Solution
Introduce multiple types of adaptation parameter sets (APS) including ALF, scaling list, and LMCS APS, each coded as separate NAL units, allowing independent updates without redundant coding, and utilize overlapping value spaces for APS IDs to reduce resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple parameter sets (ALF and LMCS) are signaled across multiple pictures, then comprehensive video coding parameters are provided, but network bandwidth, memory usage, and processing resources are wasted due to redundant coding
Solution Approach 1:
The patent segments the adaptation parameter sets into separate NAL units - ALF APS NAL units for adaptive loop filter parameters and LMCS APS NAL units for luma mapping with chroma scaling parameters. This segmentation allows independent signaling and updating of each parameter type, eliminating the need to retransmit all parameters whenever any single parameter changes, thereby reducing redundant network bandwidth consumption while maintaining complete parameter coverage for video coding
Solution Approach 2:
The patent implements dynamic parameter set management where the decoder can selectively update only the specific APS type that has changed (either ALF or LMCS parameters) based on picture type and change detection. This dynamic approach allows the system to adapt parameter transmission to actual needs, reducing unnecessary network traffic while ensuring coding parameter completeness is maintained when changes occur
2Device complexity
If ALF and LMCS parameters are coded together in a single APS, then simplified structure is maintained, but any parameter change requires re-coding of the entire APS including unchanged parameters
Solution Approach 1:
The patent divides the unified APS structure into separate ALF APS and LMCS APS NAL units with distinct types. This segmentation enables the decoder to update only the specific parameter set that has changed without re-coding the entire parameter set, thereby improving coding efficiency while maintaining structural simplicity through standardized NAL unit formats
Solution Approach 2:
The patent implements independent parameter change detection and updating mechanisms for ALF and LMCS parameters. When only ALF parameters change, only the ALF APS is updated; when only LMCS parameters change, only the LMCS APS is updated. This selective parameter updating approach eliminates redundant coding of unchanged parameters while maintaining a simple overall structure through consistent NAL unit handling
3Ease of operation
If a single APS type is used for all adaptation parameters, then easier management is achieved, but redundant coding occurs when only specific parameters need updating
Solution Approach 1:
The patent segments adaptation parameters into distinct ALF APS and LMCS APS types that can be independently managed and updated. The decoder identifies and processes only the relevant APS type based on the specific parameter changes needed, eliminating redundant processing of unchanged parameters while maintaining ease of management through standardized type identification and handling procedures
Data Source
AI summary
A video coding mechanism is disclosed. The mechanism includes receiving a bitstream comprising a first adaptation parameter set (APS) network abstraction layer (NAL) unit including an adaptive loop filter (ALF) type, a second APS NAL unit including a scaling list type, a third APS NAL unit including a luma mapping with chroma scaling (LMCS) type, and a slice. The mechanism further includes obtaining ALF parameters from the first APS NAL unit, obtaining scaling list parameters from the second APS NAL unit, and LMCS parameters from the third APS NAL unit. The mechanism further includes decoding the slice using the ALF parameters, the scaling list parameters, and the LMCS parameter. The mechanism further includes forwarding the slice for display as part of a decoded video sequence.