Omnidirectional Image Mapping for 3D Virtual Space Ground Distance
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Solution Overview
Problem
Existing methods for creating background images for 3D virtual spaces using omnidirectional images result in a feeling of floating for users, as they lack accurate representation of ground distance, leading to a decreased sense of realism and immersion.
Innovation Solution
An image processing device that forms a 3D model by combining a spherical model and a horizontal plane model, with the horizontal plane model's distance from the spherical model's center set based on ground distance information, allowing for accurate mapping of omnidirectional images onto the 3D model.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plane mesh-shaped model is formed to correspond to the horizontal plane in the omnidirectional image regardless of ground distance, then the user's feeling of floating is reduced, but the distance perception to the ground becomes strange and realism decreases
Solution Approach 1:
The patent changes the parameter of plane model positioning from fixed position to dynamic position based on ground distance. Specifically, it calculates the distance from the imaging position to the ground in the omnidirectional image, and uses this distance to determine the correct position of the plane model in the 3D virtual space, thereby achieving accurate ground distance perception while maintaining immersion
Solution Approach 2:
The patent implements feedback by using ground distance information from the omnidirectional image to adjust the plane model's position. The system measures the actual ground distance in the captured image, feeds this information back to the rendering process, and adjusts the virtual ground position accordingly to match real-world perception
2Ease of manufacture
If only a spherical 3D model is used for mapping omnidirectional image, then the implementation is simple, but there is no ground information in the 3D virtual space causing floating feeling
Solution Approach 1:
The patent merges a spherical model and a plane model into a composite 3D model structure. The spherical model provides the upper hemisphere for sky and surrounding environment mapping, while the plane model provides the ground surface, together forming a complete virtual environment that eliminates the floating feeling while maintaining implementation simplicity
Data Source
AI summary
An image processing device includes a modeler that creates a spherical model having a reference point of a 3D virtual space as a center, and a horizontal plane model having a distance to the center of the spherical model set based on ground distance information; and a drawing part associating coordinate values of respective vertexes on the spherical model and coordinate values of respective vertexes on the horizontal plane model with coordinate values of the omnidirectional image, replaces the coordinate values of the omnidirectional image corresponding to the coordinate values of the respective vertexes on the horizontal plane model with coordinate values of the omnidirectional image that are set to respective intersections between respective direction vectors directed from the center of the spherical model to the respective vertexes, and the spherical model, and maps the omnidirectional image on the spherical model and the horizontal plane model to form a background image Imap for the 3D virtual space.