VAR Photometric Rendering for Natural Exposure Simulation
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Solution Overview
Problem
Existing virtual and augmented reality (VAR) systems struggle to represent photometrically diverse scenes on displays with limited dynamic ranges, leading to unnatural representations due to the loss of relative exposure information.
Innovation Solution
A method is developed to simulate photometrically diverse VAR scenes by determining device orientation, calculating a 3D projection, computing ray directions, and adjusting virtual photometric parameters based on user inputs and intrinsic photographic inputs, using techniques such as image lookup and optimization to enhance image detail and immersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a static function is used to remap photometric parameters to a narrower dynamic range, then the display can show VAR scenes on limited-range displays, but relative exposure information is lost and the result looks unnatural
Solution Approach 1:
The patent applies dynamics by transitioning from a static remapping function to a dynamic exposure simulation system. The system continuously adjusts virtual photometric parameters based on real-time analysis of intrinsic photographic inputs from multiple images, allowing the exposure characteristics to adapt dynamically rather than applying a fixed transformation. This enables the display to maintain natural appearance while adapting to limited display ranges.
Solution Approach 2:
The patent changes parameters by introducing multiple virtual photometric parameters (exposure, aperture, ISO) that can be independently adjusted based on statistical analysis of input images. Instead of a simple static remap, the system computes optimal parameter values that preserve relative exposure relationships across different scenes and viewing conditions, thereby maintaining information integrity while adapting to display constraints.
2Loss of information
If multiple images with different exposures are captured to preserve detail, then the dynamic range is expanded, but the system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-capturing multiple images with different exposure settings before the actual viewing event. These pre-captured images serve as a library of intrinsic photographic inputs that can be selectively combined or analyzed to reconstruct the scene with preserved detail across the full dynamic range, avoiding the need for complex real-time processing during display.
Solution Approach 2:
The patent uses copying by creating virtual representations of the scene through multiple captured images. Instead of directly displaying the complex multi-exposure data, the system generates simplified virtual photometric parameters that copy the essential exposure relationships from the source images, enabling natural appearance on standard displays without requiring the display system to handle the full complexity of multi-exposure data.
3Adaptability or versatility
If the VAR scene content spans multiple directions with diverse photometric content, then the scene realism is improved, but the display cannot represent all photometric parameters simultaneously
Solution Approach 1:
The patent applies segmentation by dividing the diverse photometric content across multiple directional views into separate captured images, each optimized for its specific viewing angle and lighting conditions. The system then processes these segmented views independently to determine appropriate virtual photometric parameters for each, preserving the photometric diversity of different scene regions while enabling representation on displays with limited simultaneous parameter ranges.
Data Source
AI summary
A preferred method for dynamically displaying virtual and augmented reality scenes can include determining input parameters, calculating virtual photometric parameters, and rendering a VAR scene with a set of simulated photometric parameters.