3D Geometry Bitstream Metadata for Low-Load Partial Decoding
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Solution Overview
Problem
The application of existing methods to improve the efficiency of partial decoding and adaptive distribution of G-PCC bitstreams in ISOBMFF files leads to increased load on reproduction processing due to the need to parse the bitstream for spatial configuration and dependency information, potentially reducing efficiency.
Innovation Solution
An information processing apparatus and method that generates and stores metadata containing spatial configuration and dependency information of subgroups and layer-groups in a tree structure within the file container, allowing direct access to these details without parsing the bitstream, thus reducing the load on reproduction processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the method using layer-group and subgroup is applied to improve partial decoding efficiency, then the granularity of partial access can be made finer, but it is necessary to parse the G-PCC bitstream to obtain spatial configuration and dependency information, which increases the load of reproduction processing
Solution Approach 1:
The patent extracts spatial configuration information and dependency information from the G-PCC bitstream and stores them separately in the ISOBMFF file structure. This allows the reproduction device to access this information directly from the file without parsing the entire bitstream, thereby reducing reproduction processing load while maintaining fine-grained partial access capability through layer-group and subgroup structures
Solution Approach 2:
The patent performs preliminary organization of spatial configuration and dependency information during the encoding phase, storing these metadata in the file structure before reproduction. This preliminary action enables the reproduction device to quickly access necessary information without real-time parsing, reducing processing load during playback while supporting efficient partial decoding
2Productivity
If the number of tiles is increased to reduce the granularity of partial access, then the efficiency of partial decoding and adaptive distribution is improved, but the encoding efficiency of the G-PCC bitstream decreases
Solution Approach 1:
The patent segments the point cloud data into a hierarchical structure of layers and groups, where the geometry is divided into multiple layers (e.g., LOD levels) and each layer is further divided into groups. This segmentation enables fine-grained partial access without requiring an excessive number of tiles, as the hierarchical structure allows selective decoding of specific layers and groups, improving partial decoding efficiency while maintaining reasonable encoding efficiency
Data Source
AI summary
The present disclosure relates to an information processing apparatus and method capable of suppressing an increase in load of reproduction processing.The metadata including the spatial configuration information of the subgroup and the dependency information of the subgroup and the layer-group is generated on the basis of the bitstream of the geometry of the 3D data, and the file storing the bitstream and the metadata are generated. Further, on the basis of the spatial configuration information of the subgroup and the dependency information of the subgroup and the layer-group stored in the file as metadata, a bitstream of the geometry of the 3D data corresponding to the desired layer-group and the subgroup stored in the file is extracted, and the extracted bitstream is decoded. The present disclosure can be applied to, for example, an information processing apparatus, an information processing method, or the like.