Camera Focal-Length-Linked Reprojection Distance for ER Alignment
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Solution Overview
Problem
Current extended reality (ER) systems face geometric alignment errors due to variations in user head sizes and sensor positioning, leading to disorientation and unhelpful image presentation, especially when depth information is unknown or inaccurately guessed during planar reprojections.
Innovation Solution
Adjusting the focal length of a sensing system to automatically link with corresponding adjustments to the planar reprojection distance, optimizing the user's visual experience by ensuring sharp, focused, and undistorted regions of interest without separate user control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If planar reprojection is performed with a fixed or guessed distance, then the reprojection operation can be completed, but geometric alignment errors occur due to variations in user head sizes and sensor positioning
Solution Approach 1:
The patent changes the parameter used for reprojection distance from a fixed or guessed value to a value dynamically derived from the focal length of the passthrough camera. By linking reprojection distance to focal length (distance = k × focal length, where k is a scaling factor), the system adapts to different user head sizes and sensor positions without adding complex hardware, thereby improving geometric alignment accuracy while maintaining system simplicity
Solution Approach 2:
The system uses the focal length parameter as feedback to automatically adjust the reprojection distance. The focal length, which inherently reflects the optical characteristics and positioning of the camera, provides continuous feedback that enables the reprojection operation to self-correct for geometric alignment errors caused by variations in user anatomy and device configuration
2Measurement precision
If separate user control is added for selecting reprojection distance, then alignment accuracy can be improved, but ease of operation deteriorates
Solution Approach 1:
The system performs self-service by automatically determining the optimal reprojection distance through the focal length parameter without requiring user intervention. The passthrough camera's focal length inherently contains the information needed to calculate the correct reprojection distance, allowing the system to self-adjust and eliminate the need for separate user controls, thereby maintaining ease of operation while achieving accurate alignment
Solution Approach 2:
The focal length parameter serves multiple functions: it characterizes the optical properties of the camera and simultaneously determines the reprojection distance. This multi-functionality allows a single parameter to address both the optical configuration and the geometric alignment requirements, eliminating the need for separate user controls while maintaining accuracy across different users and configurations
Data Source
AI summary
Techniques for linking a distance used during a reprojection operation with a focal length of a sensing system are disclosed. As a result, modifications to the focal length result in corresponding modifications to the distance. A focal length of the sensing system is adjusted. An image generated by the sensing system is accessed. A particular distance is selected based on the adjusted focal length of the sensing system. The distance is used to reproject the image.