VR Motion Computing System for Drift Error Compensation
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Solution Overview
Problem
Conventional mixed reality technologies face issues with drift error in inertial measurement units and dead zone errors in head-mounted displays, leading to biased interactive input in virtual reality environments.
Innovation Solution
A motion computing system comprising a wearable device with an inertial measurement unit and a head-mounted display that uses hand tracking algorithms to determine the device position and rotation, calculating a pointer direction to generate a ray in a virtual reality field, thereby improving interactive input accuracy and allowing hand-free user interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an inertial measurement unit is used to detect user motion, then the user can interact with the electronic device through motion detection, but drift error occurs leading to biased interactive input
Solution Approach 1:
The patent combines multiple sensing technologies (inertial measurement unit, optical tracking, and electromagnetic field sensors) into an integrated motion computing system. The IMU provides motion detection capability while optical tracking and electromagnetic sensors compensate for drift errors, achieving both ease of motion-based operation and high measurement precision through sensor fusion
Solution Approach 2:
The system implements continuous feedback by constantly monitoring position and orientation data from multiple sensors and using filtering algorithms (such as Kalman filters) to correct drift errors in real-time. The feedback loop compares expected motion patterns with actual sensor readings and adjusts the interactive input accordingly, maintaining accuracy over extended periods
2Ease of operation
If a controller is used to detect interactive input data, then button pressing and direct control are enabled, but the user cannot operate hand-free
Solution Approach 1:
The system creates a universal interaction framework that supports multiple input modalities including hand gestures, full hand tracking, and motion-based control. The motion computing system can adapt to different interaction scenarios, providing direct control when needed while enabling hand-free operation through gesture recognition and spatial tracking, making the system versatile across different use cases
3Adaptability or versatility
If a head-mounted display is used to simulate virtual reality environments, then immersive experience is provided, but dead zone error occurs reducing interaction accuracy
Solution Approach 1:
The patent introduces electromagnetic field sensors and optical tracking systems as intermediary technologies between the head-mounted display and the user's hand movements. These intermediary sensors detect hand position and gesture independently of the HMD's display system, providing accurate pointer direction calculation that compensates for dead zone errors while maintaining VR immersion
Data Source
AI summary
A motion computing system for virtual reality is provided, which comprises a wearable device and a head-mounted display. The head-mounted display performs following steps for: setting a wearing position of the wearable device; determining whether to generate a hand model having finger skeleton data for the hand of the user is found in a monitored field by a hand tracking algorithm; in response respond to that determine the hand model is found in the monitored field, identifying a device position according to the wearing position and the finger skeleton data, and identifying a device rotation of the wearable device in the monitored field according to the inertial data; calculating a pointer direction in the monitored field according to the device position and the device rotation; and generating a ray in a virtual reality field according to the pointer direction and the device position.