HRD Parameter Signaling in Video Coding
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Solution Overview
Problem
Current video coding standards face challenges in efficiently signaling and decoding hypothetical reference decoder parameters, particularly in handling temporal sub-layers, which affects the compression and transmission of video data.
Innovation Solution
The method involves decoding and encoding techniques that signal a flag to indicate whether HRD parameters are signaled for each temporal sub-layer or a single instance for all sub-layers, and defining a starting sub-layer based on this flag, allowing for efficient encoding and decoding of video data by utilizing a processor and memory to manage the parameters effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If HRD parameters are signaled for each temporal sub-layer, then the precision of video decoding control is improved, but the signaling overhead and data volume increase
Solution Approach 1:
The patent segments the HRD parameter signaling by introducing a flag that allows selective signaling: when the flag indicates per-sub-layer signaling, parameters are divided and signaled for each temporal sub-layer individually; when the flag indicates unified signaling, parameters are signaled once for all sub-layers. This segmentation enables flexible control precision while managing signaling overhead.
Solution Approach 2:
The patent implements dynamic signaling behavior based on the flag state. The system can switch between two operational modes: dynamic per-sub-layer parameter signaling for higher precision control, and dynamic unified parameter signaling for reduced overhead. This dynamic adaptability allows the system to optimize between precision and overhead based on specific encoding/decoding requirements.
2Quantity of substance
If a single instance of HRD parameters is signaled for all temporal sub-layers, then the signaling overhead is reduced, but the adaptability to different temporal sub-layers decreases
Solution Approach 1:
The patent makes the HRD parameter signaling universal by introducing a flag that enables a single parameter instance to serve multiple temporal sub-layers. When the unified signaling mode is selected, the same HRD parameters are applied across all temporal sub-layers, reducing overhead while maintaining functional coverage. This universal approach allows one set of parameters to fulfill the role of controlling multiple sub-layers.
Solution Approach 2:
The system dynamically adjusts its adaptability level based on the flag state. In unified signaling mode, the system provides broad coverage across all sub-layers with reduced overhead. In per-sub-layer signaling mode, the system provides specialized adaptation for each sub-layer. This dynamic switching enables the system to balance between overhead reduction and adaptability maintenance.
3Reliability
If hypothetical reference decoder parameters syntax structure includes parameters for all temporal sub-layers, then the completeness of decoding information is improved, but the complexity of the syntax structure increases
Solution Approach 1:
The patent extracts the decision logic for parameter inclusion into a separate flag element. Instead of always including all parameters for all sub-layers, the flag extracts and controls which parameter sets are included in the syntax structure. This extraction simplifies the syntax structure by conditionally including only necessary parameters while maintaining completeness when needed.
Solution Approach 2:
The patent segments the parameter inclusion logic by introducing a flag that divides the syntax structure into two possible configurations: one where parameters are included for each temporal sub-layer, and another where parameters are included only for the maximum temporal sub-layer. This segmentation reduces syntax complexity by avoiding the need to always include all parameters for all sub-layers.
4Manufacturing precision
If the decoder processes parameters for each temporal sub-layer individually, then the accuracy of video reconstruction is improved, but the processing time increases
Solution Approach 1:
The patent implements dynamic processing behavior based on the flag state. When per-sub-layer parameter signaling is enabled, the decoder dynamically processes parameters for each temporal sub-layer individually, achieving higher reconstruction accuracy. When unified signaling is enabled, the decoder dynamically processes parameters once for all sub-layers, reducing processing time. This dynamic approach allows the system to balance between accuracy and processing time based on specific requirements.
Solution Approach 2:
The patent allows partial processing action by enabling the system to process parameters for only the necessary temporal sub-layers based on the flag state. When unified signaling is used, the system performs a single processing action that suffices for all sub-layers, avoiding excessive processing. When per-sub-layer signaling is used, the system performs targeted processing for each sub-layer, achieving accuracy without always performing excessive full processing.
Data Source
AI summary
A device may be configured to signal hypothetical reference decoder parameters according to one or more of the techniques described herein.