VR Headset Camera Calibration for Thermal Deformation Compensation
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Solution Overview
Problem
Virtual or augmented reality systems suffer from misalignments due to thermal and mechanical deformations of headset components, leading to compromised image quality and user experience.
Innovation Solution
A continuous calibration method using bundle adjustment techniques to compensate for elastic deformations, dividing image data into groups based on miscalibration conditions, and optimizing extrinsic parameters to adjust camera alignment and orientation in real-time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous calibration is performed in real-time, then image quality is maintained despite deformations, but computational complexity increases
Solution Approach 1:
The patent segments the continuous calibration process into discrete groups of poses based on detected miscalibration conditions. This segmentation allows the system to perform bundle adjustment on manageable subsets of data rather than continuously processing all data, thereby maintaining image quality while reducing computational complexity.
Solution Approach 2:
The system performs calibration periodically based on detected miscalibration conditions rather than continuously. By triggering bundle adjustment only when miscalibration conditions are detected, the system maintains image quality while avoiding unnecessary computational overhead during stable periods.
2Measurement precision
If calibration data is collected continuously, then accuracy improves, but processing time increases
Solution Approach 1:
The patent divides continuous calibration data into separate groups based on miscalibration conditions. This segmentation enables the system to process smaller, manageable subsets of data independently, maintaining calibration accuracy while significantly reducing the time required to process the entire dataset.
Solution Approach 2:
The system performs preliminary detection of miscalibration conditions and pre-segments data into groups before performing bundle adjustment. This preliminary action allows the system to prepare data structures and identify processing boundaries in advance, reducing actual processing time while maintaining accuracy.
3Ease of operation
If the headset structure is made flexible and lightweight, then comfort improves, but sensor alignment stability deteriorates
Solution Approach 1:
The patent implements a dynamic calibration system that adapts to the flexible headset structure by detecting miscalibration conditions and adjusting calibration parameters in real-time. This dynamic approach allows the headset to remain comfortable and flexible while maintaining sensor alignment stability through continuous adaptation.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor sensor alignment and detect miscalibration conditions. This feedback loop enables the system to identify when flexible structure deformations affect alignment and trigger appropriate calibration adjustments, maintaining stability despite the flexible design.
Data Source
AI summary
Techniques for addressing deformations in a virtual or augmented headset described. In some implementations, cameras in a headset can obtain image data at different times as the headset moves through a series of poses of the headset. One or more miscalibration conditions for the headset that have occurred as the headset moved through the series of poses can be detected. The series of poses can be divided into groups of poses based on the one or more miscalibration conditions, and bundle adjustment for the groups of poses can be performed using a separate set of camera calibration data. The bundle adjustment for the poses in each group is performed using a same set of calibration data for the group. The camera calibration data for each group is estimated jointly with bundle adjustment estimation for the poses in the group.