SPS Parameter Signaling for PTL, DPB, and HRD Bitstream Efficiency
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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 high-efficient image compression technology for effective transmission, storage, and reproduction.
Innovation Solution
An image encoding/decoding method and apparatus that efficiently signal PTL, DPB, and HRD related information in SPS by obtaining flag information to determine the presence of these structures in sequence parameter sets, allowing for improved encoding/decoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-resolution and high-quality image data is transmitted, then image quality is improved, but transmission cost and storage cost increase
Solution Approach 1:
The patent extracts and removes redundant information from the bitstream by selectively signaling PTL, DPB, and HRD parameters only when necessary (when flag information indicates their presence). This extraction of essential information while discarding redundant data reduces the overall bitstream size, thereby lowering transmission and storage costs while maintaining image quality.
Solution Approach 2:
The patent applies partial action by conditionally signaling parameters based on flag information. Instead of always transmitting all possible parameters (excessive action), the system transmits only the necessary subset of parameters (PTL, DPB, or HRD) depending on the specific encoding context, optimizing the balance between image quality and transmission efficiency.
2Measurement precision
If PTL, DPB, and HRD information is always signaled in SPS, then decoding accuracy is improved, but bitstream size increases
Solution Approach 1:
The patent introduces dynamic parameter signaling where the presence of PTL, DPB, and HRD structures in the SPS is determined by flag information rather than being static. This dynamic approach allows the bitstream to adaptively include or exclude parameters based on the specific encoding scenario, maintaining decoding accuracy when needed while minimizing bitstream size when full parameter sets are not required.
Solution Approach 2:
The patent applies local quality by allowing different parts of the bitstream to have different levels of parameter detail. Instead of uniformly signaling all parameters throughout, the system selectively provides detailed parameter information (PTL, DPB, HRD) only in specific locations where required by the flag information, optimizing the balance between decoding accuracy and bitstream efficiency.
3Productivity
If flag information is used to conditionally signal parameters, then transmission efficiency is improved, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining flag information that indicates the presence or absence of PTL, DPB, and HRD structures before actual parameter signaling. This preliminary flag mechanism allows the decoder to quickly determine which parameters to process, avoiding the need for complex runtime analysis and simplifying the processing complexity while maintaining high transmission efficiency.
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.