Image Decoding Apparatus HRD Signaling Optimization
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images has led to a need for highly efficient image compression techniques to reduce transmission and storage costs.
Innovation Solution
The proposed method and apparatus improve image coding efficiency by signaling HRD-related syntax elements for OLS, DPB-related syntax elements, and/or PTL-related syntax elements, and by determining whether to transmit HRD for each OLS, reducing the number of bits required for signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If HRD-related syntax elements are signaled for each OLS in a multi-layer system, then decoding accuracy is improved, but the number of bits for signaling increases
Solution Approach 1:
The patent segments the HRD parameter signaling by introducing a flag `ols_hrd_params_present_flag` that allows selective signaling of HRD parameters for each OLS. This segmentation enables the system to transmit HRD-related syntax elements only when necessary for specific OLS configurations, thereby maintaining decoding accuracy where needed while reducing overall signaling bit consumption.
Solution Approach 2:
The patent applies partial action by conditionally signaling HRD parameters only for OLS that require them. Through the `ols_hrd_params_present_flag`, the system performs HRD parameter signaling partially (only for specific OLS) rather than for all OLS, achieving the necessary decoding accuracy while minimizing the quantity of signaling bits used.
2Manufacturing 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 HRD parameter signaling from a fixed state (always signaled) to a variable state (conditionally signaled based on `ols_hrd_params_present_flag`). This parameter change enables adaptive transmission where HRD parameters are included only when necessary for the specific OLS configuration, reducing transmission data volume and associated costs while preserving image quality through selective parameter transmission.
Data Source
AI summary
An image decoding method performed by a decoding apparatus according to the present disclosure comprises the steps of: obtaining image information including HRD-related information relating to a target OLS, wherein the target OLS is one of OLSs including a plurality of layers; determining whether an HRD parameter syntax structure relating to the target OLS exists, on the basis of the HRD-related information; deriving an HRD parameter syntax structure relating to the target OLS on the basis of a result of the determination; performing a DPB management process relating to a DPB on the basis of the HRD parameter syntax structure for the target OLS; and decoding a current picture on the basis of the DPB.