Mobile Device Pose Calibration for Headset MR Rendering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Low-cost headsets for mixed reality (MR) and virtual reality (VR) face challenges in maintaining optimal rendering of 3D virtual content due to variability in the pose of mobile electronic devices relative to the headset, leading to distorted images and misalignment with real-world content.
Innovation Solution
A mobile electronic device with a holder configured to maintain a defined pose relative to the headset, equipped with a camera and display device, uses calibration parameters to identify the pose of optically identifiable features and adjust the rendering of graphical objects accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If low-cost headsets use variable positioning of mobile electronic devices, then ease of operation and adaptability improve, but manufacturing precision and rendering quality deteriorate due to pose variability
Solution Approach 1:
The system performs preliminary calibration by capturing images of optically identifiable features at defined poses, stores calibration parameters, and uses these pre-established parameters to compensate for pose variability during operation, enabling accurate rendering without requiring precise manufacturing tolerances
Solution Approach 2:
The system changes calibration parameters based on identified pose variability, adjusting rendering parameters dynamically according to the actual pose of the mobile electronic device relative to the headset, thereby maintaining rendering precision across different positioning scenarios
2Manufacturing precision
If headsets use fixed defined pose for mobile electronic device, then rendering precision improves, but device complexity and holder design complexity increase
Solution Approach 1:
The holder is pre-configured with optically identifiable features at specific locations that enable automated pose detection through image capture and processing, eliminating the need for complex mechanical positioning mechanisms while maintaining defined pose relationships
Solution Approach 2:
The system replaces complex mechanical positioning and alignment mechanisms with an optical detection system using cameras and image processing algorithms to identify pose based on optically identifiable features, simplifying the mechanical holder design
3Manufacturing precision
If calibration parameters are stored for compensating pose variability, then rendering quality improves, but loss of time increases due to calibration processing
Solution Approach 1:
Calibration parameters are captured and stored in advance during device insertion or setup phase, allowing the system to use pre-computed parameters for rapid pose compensation during actual operation without repeated calibration processing delays
Solution Approach 2:
The system automatically performs calibration processing without requiring manual intervention or user calibration actions, capturing images and computing parameters autonomously when the device is inserted into the holder, thereby minimizing perceived calibration time
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution optimizes the operation of mobile electronic devices within headsets by compensating for pose variability, improving the quality and alignment of 3D virtual content for users, and providing guidance for optimal device positioning.
Implementation Method 1
The camera is configured to output digital pictures and arranged by the holder to view a portion of the headset
Implementation Method 2
light emitted by a display device of a mobile electronic device is projected toward a lens
Implementation Method 3
The lens reflects the light toward the user's eyes (e.g., along path 200b, predominantly by virtue of specular reflection)
Data Source
AI summary
A mobile electronic device is provided for use with a headset. A camera outputs digital pictures of a portion of the headset. A display device displays information for viewing by a user wearing the headset. A processor retrieves calibration parameters that characterize at least a pose of the camera relative to the display device, and processes a digital picture from the camera to identify a pose of an optically identifiable feature within the digital picture. A pose of the mobile electronic device is identified relative to the holder based on the identified pose of the optically identifiable feature within the digital picture and based on at least the pose of the camera relative to the display device as characterized by the calibration parameters. The processor controls where graphical objects are rendered on the display device based on the identified pose of the mobile electronic device relative to the holder.