Point Cloud Tile Inventory Scope for Efficient Bitstream Coding
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Solution Overview
Problem
The persistency scope and bitstream order of tile inventory in the Geometry-based Point Cloud Compression (G-PCC) standard are not clearly specified, leading to inefficiencies in coding efficiency.
Innovation Solution
Specify that the tile inventory is valid starting from the first coded point cloud frame following the tile inventory data unit in bitstream order, with the frame counter partially indicated in the data unit, and remains valid until replaced or until the end of the sequence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the persistency scope of tile inventory is not clearly specified in conventional G-PCC, then the coding efficiency is reduced and bitstream order restrictions occur, but the patent resolves this by clearly specifying that the tile inventory remains valid starting from the first coded point cloud frame following the tile inventory data unit in bitstream order
Solution Approach 1:
The patent changes the parameter of persistency scope definition from undefined to clearly specified, establishing that the tile inventory remains valid starting from the first coded point cloud frame following the tile inventory data unit in bitstream order. This parameter change resolves the contradiction by providing clear validity boundaries that improve coding efficiency while eliminating bitstream order restrictions.
2Reliability
If the tile inventory validity start point is defined as the first coded point cloud frame following the data unit, then the persistency scope is clearly specified and coding efficiency improves, but this requires precise bitstream order tracking
Solution Approach 1:
The patent applies preliminary action by pre-defining the validity scope of the tile inventory data unit in the bitstream structure. By specifying that the tile inventory remains valid starting from the first coded point cloud frame following the data unit, the reliability of persistency scope is improved while the bitstream order tracking becomes a straightforward structural rule rather than a complex detection task.
Data Source
AI summary
Embodiments of the present disclosure provide a solution for point cloud coding. A method for point cloud coding is proposed. The method comprises: performing a conversion between a point cloud sequence and a bitstream of the point cloud sequence based on a tile inventory, the tile inventory being valid starting from a first coded point cloud frame in the bitstream, the first coded point cloud frame immediately following a data unit for the tile inventory in a bitstream order, or the first coded point cloud frame following the data unit in the bitstream order and having a frame counter partially indicated in the data unit. Thereby, the proposed method can advantageously better support the application of the tile inventory.