VR Motion Tracking Synchronization via Hand Contact
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Solution Overview
Problem
Existing virtual reality (VR) tracking systems face challenges in aligning absolute reference frames, particularly when multiple users attempt to perform coordinated actions like handshakes, due to discrepancies in motion tracking and timing synchronization.
Innovation Solution
A calibration method involving users clapping each other's hands to detect spikes in motion data, synchronizing their systems by matching contact signal characteristics, timestamps, and locations, with prolonged calibration to reduce errors and establish a shared positional reference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple stand-alone VR tracking systems are used for multi-player virtual reality, then each user can have independent motion tracking, but the absolute reference frames of different systems cannot be aligned
Solution Approach 1:
The patent uses hand contact as an intermediary event to synchronize multiple VR systems. When users' hands touch, sensors detect the contact and generate a timestamped signal that serves as a reference point for aligning the absolute reference frames of different tracking systems. This intermediary contact event bridges the gap between independent systems, enabling precise spatial and temporal alignment without requiring complex calibration equipment.
2Measurement precision
If users perform hand contact calibration actions, then timing synchronization and positional reference can be established, but the calibration process requires user coordination and time
Solution Approach 1:
The calibration process uses periodic hand contact actions (such as repeated handshakes or high-fives) to establish multiple synchronization points. By performing the calibration action multiple times, the system accumulates timing data that can be averaged and refined, improving synchronization accuracy while providing users with feedback on calibration progress. The periodic nature of the action makes it intuitive and easy to perform.
Solution Approach 2:
The system provides real-time feedback to users during calibration by monitoring the quality and consistency of hand contact signals. When sufficient calibration data is collected and reference frames are successfully aligned, the system notifies users to stop the calibration action. This feedback mechanism prevents unnecessary calibration time and allows users to understand when the process is complete.
3Measurement precision
If sensors are integrated into gloves or implements for contact detection, then contact signals can be detected accurately, but the device complexity increases
Solution Approach 1:
The patent integrates multiple sensor types (accelerometers, gyroscopes, contact buttons, microphones) into single devices like gloves or implements that serve multiple functions. These devices not only detect hand contact for calibration but also track hand position, orientation, and motion throughout the VR experience. This multi-functionality reduces the need for separate calibration equipment and simplifies the overall system architecture.
Data Source
AI summary
Two virtual reality (VR) systems are calibrated to share a common reference frame using a calibration step in which multiple VR users clap each other's hands. As two players do so, spikes are detected in the motion data when their hands come in contact. The spikes are used to effect timing synchronization of the disparate systems to align the motions.