Inter-Layer Video Decoding Syntax for Lower Bitrate Signaling
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Solution Overview
Problem
Existing video coding technologies face challenges in efficiently compressing video data across limited bandwidth networks without sacrificing picture quality, particularly in scenarios involving multiple layers with different resolutions.
Innovation Solution
Implementing inter-layer prediction techniques by using syntax elements to determine the necessity of inter-layer reference pictures, allowing for reduced bitrate by disabling unnecessary signaling of inter-layer prediction information when not needed, and encoding/decoding methods that manage video bitstreams based on sequence parameter sets and video parameter sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If inter-layer prediction is always enabled and signaled in multi-layer video coding, then prediction accuracy is improved, but bitrate increases due to unnecessary signaling overhead
Solution Approach 1:
The patent applies dynamics by making the inter-layer prediction capability configurable and conditional rather than fixed. The system dynamically enables or disables inter-layer prediction based on the presence of VPS and specific syntax element values, allowing the prediction mechanism to adapt its behavior to the actual multi-layer configuration and requirements of the video content being decoded.
Solution Approach 2:
The patent applies local quality by enabling inter-layer prediction selectively rather than uniformly across all layers and all prediction units. The syntax elements allow different parts of the video data (different layers, different picture regions) to use inter-layer prediction only where it provides benefit, avoiding unnecessary signaling and processing in areas where it is not needed.
2Reliability
If VPS is always referenced by SPS in multi-layer coding, then inter-layer reference functionality is ensured, but complexity increases due to additional parameter set management
Solution Approach 1:
The patent applies dynamics by making the VPS reference relationship conditional rather than mandatory. The system dynamically determines whether to reference VPS based on the sps_video_parameter_set_id value and the presence of inter-layer enabled syntax elements, allowing the parameter set management structure to adapt to the actual multi-layer coding requirements and reduce unnecessary complexity.
3Adaptability or versatility
If all syntax elements for inter-layer prediction are always transmitted, then decoding flexibility is improved, but compression efficiency deteriorates due to increased data volume
Solution Approach 1:
The patent applies the extraction principle by selectively removing unnecessary syntax elements from the bitstream. When inter-layer prediction is not required (determined by sps_video_parameter_set_id value and layer configuration), the corresponding syntax elements are not transmitted, extracting only the essential information needed for decoding while eliminating redundant data that would reduce compression efficiency.
Solution Approach 2:
The patent applies partial action by transmitting inter-layer prediction syntax elements only partially - specifically when and where they are needed. Rather than always transmitting all possible syntax elements for maximum decoding flexibility, the system transmits only the subset necessary for the current multi-layer configuration, achieving adequate flexibility without excessive data volume.
Data Source
AI summary
A method of decoding a coded video bitstream includes obtaining a sequence parameter set (SPS)-level syntax element from the bitstream, wherein that the SPS-level syntax element equaling a preset value specifies that no video parameter set (VPS) is referred to by a SPS, and wherein the SPS-level syntax element being greater than the preset value specifies that the SPS refers to a VPS. The method further includes obtaining, when the SPS-level syntax element is greater than the preset value, an inter-layer enabled syntax element specifying whether one or more inter-layer reference pictures (ILRPs) are enabled to be used for the inter prediction of one or more coded pictures, and predicting one or more coded pictures based on the value of the inter-layer enabled syntax element.