Video Parameter Set DPB Signaling for Bitstream Efficiency
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Solution Overview
Problem
There is a need for high-efficient image compression technology to effectively transmit, store, and reproduce high-resolution and high-quality images, as the increased amount of transmitted information leads to higher transmission and storage costs.
Innovation Solution
An image encoding/decoding method and apparatus that improves encoding/decoding efficiency by efficiently signaling a Decoded Picture Buffer (DPB) parameter, including obtaining information about output layer sets and DPB parameter syntax structures within a video parameter set, and managing the DPB based on these structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-resolution and high-quality images are transmitted, then image quality is improved, but transmission cost and storage cost increase
Solution Approach 1:
The patent changes the parameter of DPB parameter syntax structure signaling in the video bitstream. By introducing a flag `vps_all_independent_layers_flag` and conditionally signaling DPB parameters based on this flag, the system optimizes the balance between image quality and data quantity. When the flag is set to 0, DPB parameters are not signaled in VPS, reducing bitstream size while maintaining quality through alternative parameter derivation methods.
2Measurement precision
If DPB parameter syntax structures are always signaled in VPS, then decoding accuracy is improved, but bitstream complexity increases
Solution Approach 1:
The patent makes the DPB parameter signaling dynamic rather than static. The `vps_all_independent_layers_flag` dynamically controls whether DPB parameters are signaled in the VPS based on the actual layer structure. This dynamic approach allows the system to adapt the bitstream structure to the specific encoding scenario, avoiding unnecessary complexity when DPB parameters can be derived from other sources.
Solution Approach 2:
The patent applies local quality by differentiating the signaling requirements based on the specific layer configuration. When `vps_allindependentlayersflag` is 0, the system uses a simplified approach where DPB parameters are not repeated in VPS. Instead, the system derives DPB parameters locally from layer-specific parameters or defaults, optimizing the balance between accuracy and complexity for each local scenario.
Data Source
AI summary
An image encoding/decoding method and apparatus for signaling a VPS and a recording medium storing a bitstream are provided. An image decoding method may comprise obtaining first information indicating whether each output layer set (OLS) specified by a video parameter set (VPS) includes only one layer, obtaining second information indicating the number of decoded picture buffer (DPB) parameter syntax structures in the VPS, based on the first information, obtaining the DPB parameter syntax structures in the VPS based on the second information, and managing a DPB based on the DPB parameter syntax structures.