Reference Picture Resampling for Adaptive Resolution Decoding
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Solution Overview
Problem
Existing video coding technologies struggle with efficiently managing changes in picture size and resolution within a coded video sequence, particularly in modern codecs like VVC, which require efficient signaling of adaptive resolution changes and reference picture resampling for spatial scalability.
Innovation Solution
A method and device for decoding video bitstreams that utilize flags to determine if picture resolution is changed, enabling or disabling reference picture resampling for spatial scalability and adaptive resolution change (ARC) based on these flags, and employing specific signaling mechanisms for ARC parameters within the video coding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If reference picture resampling is performed for spatial scalability and adaptive resolution change, then flexibility in managing picture size and resolution is improved, but device complexity increases due to additional signaling mechanisms and processing requirements
Solution Approach 1:
The patent implements dynamic resolution adjustment by enabling reference picture resampling with different scaling factors (e.g., 2:1, 3:2, 4:3, 16:9) based on scene requirements. The system can adaptively change picture resolution within a coded video sequence rather than maintaining a fixed resolution, allowing the decoder to resample reference pictures at different resolutions for spatial scalability and adaptive resolution change (ARC).
Solution Approach 2:
The patent introduces new syntax elements and parameters to control reference picture resampling, including scaling factors, resampling enable/disable flags, and ARC-specific parameters. These parameters allow the encoder to signal resolution change information to the decoder, enabling flexible picture size management while maintaining standardized processing through defined parameter sets and signaling mechanisms.
2Productivity
If modern video codecs like VVC implement adaptive resolution changes and reference picture resampling, then compression efficiency is improved, but the complexity of signaling mechanisms increases
Solution Approach 1:
The patent segments the resolution control mechanism into distinct components: base layer resolution parameters, enhancement layer resolution parameters, and ARC-specific parameters. This segmentation allows independent control of different resolution aspects and enables selective signaling based on whether spatial scalability or adaptive resolution change is being used, reducing overall signaling complexity through modular parameter management.
Solution Approach 2:
The patent creates a universal reference picture resampling framework that serves multiple functions: spatial scalability (different resolutions for different layers), adaptive resolution change (temporal resolution adaptation), and picture size management. This multi-functional approach allows a single set of signaling mechanisms to handle various resolution-related operations, improving compression efficiency across different scenarios without requiring separate specialized mechanisms for each function.
Data Source
AI summary
A method, device, and non-transitory computer-readable medium for decoding an encoded video bitstream using at least one processor, including, obtaining from the encoded video bitstream a first flag indicating that reference picture resampling is enabled for coded video sequence (CVS); determining a value of a second flag indicating whether a picture resolution is changed in the CVS; based on the value of the second flag indicating that the picture resolution is changed in the CVS, decoding the CVS using the reference picture resampling for spatial scalability and adaptive resolution change (ARC); and based on the value of the second flag indicating that the picture resolution is not changed in the CVS, decoding the CVS using the reference picture resampling for the spatial scalability, and without using the reference picture resampling for the ARC.