ISOBMFF V-PCC Tile Tracks for Partial Point Cloud Access

The patent segments the V-PCC bitstream into multiple independent tile groups, where each tile group can be independently decoded and accessed. This is achieved by dividing the point cloud data into multiple tiles organized in groups, with each group having its own syntax elements and data structures. The segmentation enables partial access to specific regions of interest without requiring decoding of the entire bitstream, thus improving adaptability while maintaining manageable complexity through structured organization.

The patent introduces a new dimension of organization by creating a hierarchical structure with tile groups at one level and individual tiles at another level. This multi-level hierarchy adds structural depth to the signaling, allowing access control and decoding operations to occur at different granularities. The dimensional expansion from flat bitstream structure to hierarchical tile group structure enables flexible partial access while organizing complexity in a manageable framework.

The patent extracts and isolates specific tile groups from the complete V-PCC sequence, allowing the decoder to process only the extracted portions that contain regions of interest. By separating desired data from the complete sequence and providing independent syntax elements for each tile group, the system enables selective decoding that eliminates unnecessary computational overhead associated with decoding entire sequences when only partial access is required.

The patent implements partial action by enabling decoders to perform only the necessary decoding operations for specific tile groups rather than processing the complete V-PCC sequence. The independent structure of tile groups with their own syntax elements allows the decoder to execute partial decoding operations, performing exactly the amount of work needed to access regions of interest without excessive processing of unrelated data, thus improving productivity and reducing time loss.

The patent applies local quality by assigning different properties and characteristics to different tile groups based on their spatial locations and importance. Each tile group can have independent syntax elements, data structures, and decoding parameters tailored to its specific requirements. This localized approach allows flexible access to different regions with appropriate processing characteristics while organizing the overall mapping structure in a systematic manner that manages complexity through consistent local patterns.

The patent utilizes parameter changes by allowing different syntax elements and configuration parameters to be applied to different tile groups. The mapping structure supports variable parameters for each tile group, enabling adaptive control over decoding behavior, precision, and resource allocation based on regional requirements. This parameter variability provides access flexibility while the structured parameter organization maintains manageable complexity through consistent rules and patterns.