SPS PTL, DPB, and HRD Signaling for Layer-Aware Video Coding
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images leads to an increase in transmission and storage costs due to the rise in the amount of transmitted information or bits, necessitating improved image encoding/decoding efficiency, particularly in signaling PTL, DPB, and HRD related information in SPS.
Innovation Solution
An image encoding/decoding method and apparatus that efficiently signals PTL, DPB, and HRD information by obtaining flag information indicating the presence of these structures in SPS or VPS, allowing for improved processing of the current output layer set based on the obtained syntax 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 applies parameter changes by dynamically adjusting the signaling of PTL, DPB, and HRD parameters based on the actual needs of the image data. When these parameters are not needed, the syntax structures are omitted or set to default values, reducing the bit rate while maintaining image quality when necessary.
Solution Approach 2:
The patent implements partial action by selectively signaling only the necessary PTL, DPB, and HRD parameters rather than always signaling all parameters. This is achieved through conditional syntax structures that only include these parameters when they are actually needed for the given image data, avoiding unnecessary bits while ensuring quality when required.
2Reliability
If PTL, DPB, and HRD related information is always signaled in SPS, then decoding reliability is improved, but bit rate increases
Solution Approach 1:
The patent changes the presence parameters of PTL, DPB, and HRD syntax structures based on actual decoding needs. The encoder determines whether these parameters should be signaled by checking if they are needed for the current image data, and adjusts the bitstream accordingly to maintain reliability only when necessary.
Solution Approach 2:
The patent applies partial action by providing complete parameter signaling only when necessary. The syntax structures include PTL, DPB, and HRD parameters only when the image data requires them, rather than always including all parameters. This ensures decoding reliability is maintained when needed while reducing bit rate when these parameters are not required.
3Manufacturing precision
If complete syntax structures are used for PTL, DPB, and HRD, then encoding accuracy is improved, but encoding complexity increases
Solution Approach 1:
The patent implements partial action by using conditional syntax structures that only include complete PTL, DPB, and HRD parameter sets when necessary. When these parameters are not needed, the syntax structures are simplified or omitted entirely. This maintains encoding accuracy for cases requiring full parameter signaling while reducing encoding complexity for cases where simplified handling is sufficient.
Data Source
AI summary
An image encoding/decoding method and apparatus for signaling PTL, DPB and HRD related information in SPS and a method of transmitting a bitstream are provided. The image decoding method may comprise obtaining flag information indicating whether a profile tier level (PTL) syntax structure, a decoded picture buffer (DPB) parameter syntax structure and a hypothetical reference decoder (HRD) parameter syntax structure are present in a sequence parameter set (SPS), obtaining at least one among the PTL syntax structure, DPB parameter syntax structure and HRD parameter syntax structure, based on the flag information, and processing a current output layer set (OLS), based on the obtained syntax structure. The flag information may have a predetermined value, based on that an OLS including only one layer having the same layer identifier as a layer identifier of the SPS is present.