Interlayer Prediction Signaling in Scalable Video Coding
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Solution Overview
Problem
Existing video coding and decoding technologies face challenges in efficiently signaling inter-layer prediction and scalability in video bitstreams, which affects coding efficiency and bandwidth usage.
Innovation Solution
The introduction of new syntaxes and the use of Reference Picture Resampling (RPR) or Adaptive Resolution Change (ARC) within the high-level syntax (HLS) of video bitstreams, allowing for inter-layer prediction and scalability support without additional resampling processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If inter-layer prediction is implemented in scalable video coding, then coding efficiency is improved, but device complexity increases due to additional reference picture management and resampling processes
Solution Approach 1:
The patent extracts the resampling operation from a separate processing step and integrates it directly into the reference picture list construction process. By taking out the redundant resampling step and combining it with reference picture management, the system maintains inter-layer prediction capabilities while reducing operational complexity
Solution Approach 2:
The patent merges the resampling process with the reference picture list construction by using the same syntax elements (colocated reference picture lists) to control both functions. This combining of operations eliminates the need for separate resampling processes while maintaining the ability to perform inter-layer prediction across different resolutions
2Adaptability or versatility
If reference picture resampling is performed for inter-layer prediction, then scalability is improved, but bandwidth requirements increase due to additional bitstream data
Solution Approach 1:
The patent makes the reference picture lists universal by allowing the same syntax elements to serve multiple purposes: defining both the reference picture relationships and the resampling parameters. This multi-functionality enables scalability to be signaled without requiring separate dedicated bitstream elements, thereby avoiding additional bandwidth consumption
Solution Approach 2:
The patent changes the parameter representation by using flags and indices within existing syntax structures to indicate resampling operations. Instead of transmitting full resampling parameters, the system uses compact parameter indicators that reference pre-defined resampling configurations, reducing the bandwidth required to signal scalability information
3Measurement precision
If separate resampling processes are added for inter-layer prediction, then prediction accuracy is improved, but ease of operation deteriorates due to increased processing steps
Solution Approach 1:
The patent performs resampling as a preliminary action during the reference picture list construction phase, before the actual prediction process. By preparing the resampled reference pictures in advance and incorporating them into the reference lists, the system ensures prediction accuracy is maintained while simplifying the operational flow, as no additional resampling steps are needed during decoding
Data Source
AI summary
There is included a method and apparatus comprising computer code configured to cause a processor or processors to perform parsing at least one video parameter set comprising at least one syntax element indicating whether at least one layer in the scalable bitstream is one of a dependent layer of the scalable bitstream and an independent layer of the scalable bitstream, coding a picture in the dependent layer by parsing and interpreting an inter-layer reference picture list, and coding a picture in an independent layer without parsing and interpreting the inter-layer reference picture list.