Point Cloud Visibility Map for Adaptive V-PCC Bandwidth
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Solution Overview
Problem
In video-based point cloud compression (V-PCC), high-definition display requires acquiring entire objects including invisible portions, leading to unnecessary bit rate increase and network bandwidth inefficiency, as existing methods uniformly compress data across all projection planes without adapting to viewing direction.
Innovation Solution
An information processing device generates an identification region map using normal vector orientation and object outline information to determine visible and invisible regions, allowing for adaptive stream selection and distribution based on the viewing position, reducing unnecessary data acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If uniform compression is applied to all projection planes in V-PCC, then definition in all directions is equal, but bit rate increases unnecessarily and network bandwidth utilization deteriorates
Solution Approach 1:
The patent applies local quality by differentiating compression treatment across different spatial regions. Visible regions (front-facing surfaces) are compressed with higher quality settings while invisible regions (back-facing surfaces) use lower quality settings. This is achieved by calculating visibility determination for each projection plane based on viewing position, then applying region-specific compression parameters to match local visibility requirements.
2Measurement precision
If high-definition display is performed by acquiring entire objects including invisible portions, then viewing quality is maintained, but network bandwidth utilization deteriorates
Solution Approach 1:
The patent extracts and transmits only the necessary visible portions of the point cloud data based on calculated visibility regions. By determining which projection planes correspond to visible surfaces from the viewing position, the system extracts only those data streams needed for high-definition display, excluding invisible portions entirely from transmission.
3Productivity
If viewing direction adaptive distribution is implemented by dividing streams for each projection plane, then network bandwidth utilization improves, but device complexity increases due to stream identification requirements
Solution Approach 1:
The patent performs preliminary calculation of visibility determination and identifies the necessary divided streams before the actual streaming process. By pre-calculating which projection planes are visible from the given viewing position and preparing the identification region map in advance, the system reduces the complexity of real-time stream identification and selection during playback.
Data Source
AI summary
Provided is a generation unit that generates an identification region map indicating whether or not each divided object data is visible from each position in a three-dimensional space by using information regarding orientation of a normal vector dividing an object in the three-dimensional space and information regarding an outline of the object.