Video Bitstream GCI Defaults for Consistent VVC Processing
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Solution Overview
Problem
Existing video coding standards, particularly VVC, face challenges in efficiently processing video data due to the absence of defined values for general constraints information (GCI) syntax elements, leading to inconsistencies in video processing and reduced coding efficiency.
Innovation Solution
A method is proposed to infer predetermined values (e.g., 0) for absent GCI syntax elements such as gci_all_rap_pictures_constraint_flag, gci_no_extended_precision_processing_constraint_flag, and others, ensuring a uniform process and improved coding efficiency by defining these values when they are absent from the bitstream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If GCI syntax elements are left undefined when absent from bitstream, then bitstream parsing remains simple, but video processing consistency deteriorates
Solution Approach 1:
The patent changes the parameter status of absent GCI syntax elements from undefined to explicitly defined as having predetermined values (e.g., 0). This parameter change resolves the contradiction by providing deterministic behavior for parsing while ensuring consistent video processing across different scenarios.
Solution Approach 2:
The patent performs preliminary action by pre-defining the values of absent GCI syntax elements before they are encountered during parsing. This preliminary definition ensures that both encoder and decoder handle missing syntax elements uniformly, maintaining processing consistency without complicating the parsing process.
2Reliability
If GCI syntax elements are explicitly signaled in bitstream, then processing consistency is improved, but bitstream complexity increases
Solution Approach 1:
The patent applies partial action by selectively signaling GCI syntax elements only when necessary (when their values differ from predetermined defaults). This approach maintains processing consistency for critical parameters while avoiding unnecessary bitstream complexity by omitting redundant information where predetermined values apply.
Solution Approach 2:
The patent implements self-service by allowing the decoder to automatically use predetermined values for absent GCI syntax elements without requiring explicit signaling. This self-service mechanism reduces bitstream complexity while maintaining consistent processing behavior through the built-in default value system.
3Productivity
If predetermined values are assigned to absent GCI syntax elements, then coding efficiency is improved, but parsing requirements become more complex
Solution Approach 1:
The patent applies self-service by enabling the parsing system to automatically handle absent GCI syntax elements through built-in predetermined values. This eliminates the need for complex conditional parsing logic, as the system self-corrects by using default values when syntax elements are missing, thereby improving coding efficiency without significantly increasing parsing complexity.
Solution Approach 2:
The patent changes the parameter interpretation from requiring explicit values to accepting predetermined defaults. This parameter change simplifies parsing requirements by providing a clear fallback mechanism, allowing the system to maintain high coding efficiency while avoiding overly complex parsing logic for handling missing syntax elements.
Data Source
AI summary
Embodiments of the present disclosure provide a solution for video processing. A method for video processing is proposed. The method comprises: performing a conversion between a current video block of a video and a bitstream of the video based on general constraints information (GCI) for the video, the GCI comprising one or more syntax elements, wherein each of the one or more syntax elements is absent from the bitstream and has a value equal to a first predetermined value. Compared with the conventional solution, the proposed method can advantageously improve the coding efficiency.