Conditional General Constraint Signaling in Video Coding
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Solution Overview
Problem
Current video coding standards face challenges in effectively signaling and parsing general constraint information, which is crucial for efficient video compression and decoding, particularly in next-generation video coding standards like VVC, where complex syntax structures and varying constraints require precise handling.
Innovation Solution
The method involves receiving and parsing a profile level tier syntax structure that includes level information and optional profile, tier, sub-profile, and general constraints information, using specific syntax elements to determine the presence and imposition of constraints, enabling conditional signaling and parsing of general constraint information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If general constraint information is always signaled in the profile level tier syntax structure, then decoding accuracy is improved, but bitstream complexity increases
Solution Approach 1:
The patent applies dynamics by making the signaling of general constraint information conditional rather than static. A flag syntax element dynamically controls whether general constraint information is signaled based on actual needs, allowing the system to adapt between signaling and non-signaling states to optimize the balance between decoding accuracy and bitstream complexity
Solution Approach 2:
The patent changes the parameter of constraint information signaling from a fixed state to a variable state controlled by a flag. The flag syntax element acts as a parameter that switches between different signaling modes, enabling the system to adjust the amount of constraint information transmitted based on specific decoding requirements
2Productivity
If conditional signaling of general constraint information is implemented, then bitstream efficiency is improved, but parsing complexity increases
Solution Approach 1:
The patent applies preliminary action by placing a flag syntax element at the beginning of the profile level tier syntax structure that pre-indicates whether general constraint information will be present. This allows the decoder to prepare appropriately before processing the actual constraint information, simplifying the parsing logic by enabling early decision-making about whether to expect and process constraint data
3Manufacturing precision
If precise constraint handling is implemented in next-generation video coding standards, then video compression performance is improved, but syntax structure complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the profile level tier syntax structure into distinct segments: a flag syntax element segment that controls constraint information signaling, and the general constraint information segment itself. This segmentation allows precise constraint handling to be optionally applied only where needed, rather than requiring complex syntax structures throughout the entire coding framework
Data Source
AI summary
A device may be configured to general constraint information according to one or more of the techniques described herein.