Dynamic Environment Mapping for Realistic AR Lighting
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Solution Overview
Problem
Conventional approaches to rendering augmented reality (AR) content fail to provide a realistic experience due to incorrect lighting and shading, as they do not accurately match the appearance of physical surroundings, leading to AR objects standing out as computer-generated.
Innovation Solution
The dynamic generation of an environment map, such as a cube map, is used to determine lighting effects for AR content, capturing image data of the scene to create a three-dimensional representation of lighting conditions, which is then applied to AR objects to match the physical environment's lighting, shading, and reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rendering approaches are used for AR content, then the rendering process is simple and fast, but the lighting and shading do not match the physical surroundings, reducing realism
Solution Approach 1:
The system performs preliminary capture of environment map data from the physical scene before rendering AR content. The environment map capturing process records lighting conditions, colors, and reflections of the surroundings in advance, which are then applied during AR content rendering to ensure realistic appearance without adding complexity to the real-time rendering process
Solution Approach 2:
The system creates a copy of the physical environment's lighting and color characteristics through environment map capture. This captured environment map serves as a reference that is applied to AR content, copying the appearance properties of the physical surroundings onto virtual objects to achieve visual consistency
2Measurement precision
If environment map capture is performed from multiple orientations, then lighting accuracy is improved, but the time and computational resources required increase
Solution Approach 1:
The system performs environment map capture as a preliminary action before AR content delivery. By capturing environment maps in advance when the device is stationary or during initial setup, the system accumulates orientation data without impacting real-time AR rendering performance or user experience
Solution Approach 2:
The system dynamically adjusts the environment map capture process based on device movement. When the device moves to new orientations, the system captures additional environment map data from those orientations. This dynamic approach ensures complete lighting coverage while adapting to actual usage patterns rather than requiring fixed pre-capture protocols
Data Source
AI summary
An environment map, such as a cube map, can be obtained for a scene that is appropriate for the current lighting state. A grayscale image representation is generated that represents physical objects visible in the scene. The grayscale representation is provided to a device for rendering AR content. A color lookup table (LUT) is generated for coloring the grayscale image representation. The color LUT can be appropriate for the current lighting conditions of the scene. As the lighting state changes, such as over the course of a day, different color LUTs can be sent to the device for purposes of updating the environment map. The grayscale image representation, once colored, can serve as an environment map for purposes of creating reflection effects on AR content to be rendered with respect to a live view of the scene.