Video Signal Decoding With Conditional Sub-Picture Syntax Parsing
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Solution Overview
Problem
Existing video signal processing methods lack efficiency in encoding and decoding processes, particularly in handling sub-pictures within video signals.
Innovation Solution
A video signal processing method and device that decodes and encodes video signals by parsing specific syntax elements related to the number and boundary processing of sub-pictures, including loop filtering decisions based on the number of sub-pictures, with ID mapping handled differently for single and multiple sub-pictures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the second syntax element is always parsed regardless of sub-picture number, then the decoding process is simple and uniform, but unnecessary parsing operations waste processing time and resources when there is only one sub-picture
Solution Approach 1:
The patent applies partial action by conditionally parsing the second syntax element only when necessary (when num_subpics_minus1 is greater than 0). This avoids performing unnecessary parsing operations when there is only one sub-picture, thereby improving processing efficiency without requiring complex structural changes to the decoding device.
2Productivity
If loop filtering is always applied to sub-picture boundaries, then boundary processing is consistent and simple, but unnecessary filtering operations increase processing overhead when there is only one sub-picture
Solution Approach 1:
The patent implements partial action by applying loop filtering to sub-picture boundaries only when multiple sub-pictures are present (num_subpics_minus1 > 0). This conditional filtering approach eliminates unnecessary processing overhead for single-sub-picture cases while maintaining consistent boundary processing when needed, thereby improving overall filtering efficiency.
3Adaptability or versatility
If the syntax structure includes optional elements for sub-picture handling, then the system is more adaptable to different video configurations, but the syntax parsing becomes more complex
Solution Approach 1:
The patent applies dynamics by making the syntax element inclusion conditional based on the value of num_subpics_minus1. The second syntax element is dynamically included in the bitstream only when multiple sub-pictures are present, allowing the system to adapt to different video configurations while keeping the parsing logic relatively simple through clear conditional rules.
Data Source
AI summary
A video signal decoding device comprises a processor, wherein: the processor decodes a sequence parameter set (SPS) raw byte sequence payload (RBSP) syntax included in a bitstream of a video signal, and decodes the bitstream on the basis of the decoding result of the SPS RBSP syntax; the SPS RBSP syntax includes a first syntax element related to the number of one or more sub-pictures configuring one picture, and a second syntax element indicating whether to process a boundary of the one or more sub-pictures as a boundary of the one picture on the basis of the first syntax element; and the second syntax element is parsed only when the number of the one or more sub-pictures is two or more.