Point Cloud LoD Selection by Viewpoint Density
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Solution Overview
Problem
Existing methods for distributing and rendering 3D point cloud data struggle to maintain subjective image quality while controlling data load, as the appropriate level of detail (LoD) selection is inadequate due to variations in viewpoint distance and orientation, leading to potential image degradation and increased load.
Innovation Solution
An image processing apparatus and method that calculates the necessary point density based on the display size of a point cloud object relative to the viewpoint position, selecting or correcting the LoD content file to ensure the point density meets or exceeds this requirement, thereby maintaining image quality and controlling data load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If LoD selection is based only on distance from viewpoint to object, then data transmission load is reduced, but subjective image quality degrades due to insufficient point density at certain viewing angles
Solution Approach 1:
The patent changes the selection criteria from a single parameter (distance) to multiple parameters (distance and viewing angle), dynamically adjusting the LoD selection based on the combination of these parameters to maintain appropriate point density across different viewing conditions
Solution Approach 2:
The patent introduces dynamic LoD selection that adapts to changing viewpoint conditions. The system continuously monitors both distance and viewing angle, and adjusts the selected LoD in real-time to maintain optimal point density regardless of the viewer's position or orientation
2Manufacturing precision
If high-definition LoD is selected for all objects, then subjective image quality is maintained, but data transmission load and processing load increase significantly
Solution Approach 1:
The patent applies different LoD levels to different objects or regions based on their specific viewing conditions. Instead of uniformly applying high-definition LoD to all objects, the system selectively applies appropriate LoD levels to each object based on its distance and viewing angle, optimizing the balance between quality and data load
Solution Approach 2:
The patent applies high-definition LoD only when necessary (when viewing angle and distance require it) rather than always. This partial application of high-definition rendering maintains image quality where needed while reducing overall data transmission load by using lower LoD levels for objects that don't require high definition
3Device complexity
If LoD selection does not consider viewing angle, then device complexity is reduced, but point density becomes insufficient for objects at certain orientations causing image degradation
Solution Approach 1:
The patent extends the selection algorithm to consider additional parameters (viewing angle) without fundamentally complicating the core logic. The system calculates viewing angle and uses it as an additional criterion for LoD selection, maintaining a relatively simple algorithm structure while improving accuracy
Data Source
AI summary
The present disclosure relates to an image processing apparatus and an image processing method capable of suppressing degradation of subjective image quality while suppressing an increase in load.On the basis of the display size of a point cloud object depending on the relative position of the point cloud object based on the position of a viewpoint, the necessary point density that is the density of points necessary for displaying the point cloud object is calculated, and the content file of LoD in which the density of points of the point cloud object is equal to or higher than the calculated necessary point density is selected. The present disclosure can be applied to, for example, an image processing apparatus, an information processing apparatus, a reproduction device, a 3D rendering device, an electronic device, a method thereof, and the like.