Wearable Tracking System Position Conversion Fusion
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Solution Overview
Problem
Existing augmented reality (AR) and virtual reality (VR) devices are bulky and difficult to use, often requiring users to hold control devices intuitively and maintain a specific field of view for camera tracking, leading to challenges in intuitive interaction and tracking accuracy.
Innovation Solution
A wearable tracking system comprising a controller, camera, and sensor that determines a position conversion relationship between a user's body part and the wearable device's tracking position, using camera and sensor data to output fusion data that improves tracking precision and user experience, even when the user is out of the camera's field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If camera tracking is used to track user position, then tracking can be achieved, but the user must maintain a specific field of view and hold control devices intuitively, reducing ease of operation
Solution Approach 1:
The patent combines camera-based tracking with sensor-based tracking (accelerometer, gyroscope, magnetometer) into a unified tracking system. The controller integrates data from both sources to determine the wearing part's position, allowing accurate tracking without requiring the user to maintain specific field of view or hold control devices in particular ways.
Solution Approach 2:
The patent introduces a position conversion relationship as an intermediary that maps between camera coordinate system and sensor coordinate system. This conversion relationship enables the system to translate sensor data into meaningful position information without requiring direct camera visibility of the wearing part.
2Measurement precision
If camera data alone is used for tracking, then system complexity is reduced, but tracking precision deteriorates when user is out of camera field of view
Solution Approach 1:
The patent merges camera data processing with sensor data processing in a unified tracking framework. The controller receives and processes data from both the camera and the wearable sensor simultaneously, combining their respective strengths to achieve continuous accurate tracking regardless of camera field of view constraints.
Solution Approach 2:
The patent changes the tracking parameters by switching between camera-based visual tracking and sensor-based inertial tracking based on availability and reliability. The system dynamically adjusts which data source and processing method to use, optimizing tracking precision while managing computational complexity.
3Ease of operation
If fusion data is calculated using position conversion relationship, then user experience is improved, but computational complexity increases
Solution Approach 1:
The patent performs preliminary calculations to establish the position conversion relationship between camera coordinate system and sensor coordinate system before actual tracking operations. This pre-computed transformation matrix is then reused during tracking, reducing real-time computational complexity while maintaining accurate fusion data generation.
Data Source
AI summary
A controller is provided. The controller is adapted to determine a position conversion relationship between a predetermined position of a body part of a user and a tracking position of a wearing part of the user. The wearing part is where a wearable device is disposed on the user. The controller is configured to: obtain a camera data of a previous moment from a camera, wherein the camera data comprises an image of a wearable device; obtain a sensor data of the previous moment from a sensor of the wearable device; determine the position conversion relationship based on the camera data of the previous moment and the sensor data of the previous moment; and output a fusion data of the wearing part of a current moment based on the position conversion relationship.