Dual-Tracking VR Stylus for Sub-Millimeter Motion Precision
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Solution Overview
Problem
Current virtual reality (VR) and augmented reality (AR) controller technologies are not well-suited to capture the precise motions of the human hand, particularly for applications like computer-aided design (CAD) and media, as they fail to accurately track the fine movements of a stylus tip, both on surfaces and in mid-air.
Innovation Solution
A dual-tracking system comprising a primary hand-worn sensor and a secondary stylus-mounted sensor, along with optional tip sensors, to provide precise location and orientation data of the stylus tip within a VR tracking volume, enabling accurate tracking of fine motions and allowing writing on surfaces or in mid-air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current VR/AR controller technologies are used, then basic hand tracking is achieved, but precise stylus tip motion capture is not achieved
Solution Approach 1:
The tracking system is divided into two independent but coordinated components: a hand-worn tracker for gross hand movement and a stylus-mounted tracker for fine tip movements. This segmentation allows each component to be optimized for its specific function, achieving high overall precision without requiring a single overly complex system
Solution Approach 2:
The hand-worn tracker serves as an intermediary that captures overall hand position and orientation, while the stylus-mounted tracker captures fine tip movements. The combination of these two trackers provides complete tracking information, with the hand tracker compensating for any drift in the stylus tracker and vice versa
2Measurement precision
If a single tracking system is used on the stylus, then device simplicity is maintained, but tracking accuracy for fine motions deteriorates
Solution Approach 1:
The tracking function is segmented between two devices: the hand-worn tracker handles gross movements while the stylus tracker handles fine movements. This division allows each tracker to be simpler in design while collectively achieving high precision that would be difficult for a single tracker to achieve alone
Solution Approach 2:
The data from the hand-worn tracker and stylus-mounted tracker are merged in the processing system to produce the final tracked position. This combination leverages the strengths of both trackers: the stability of the hand-mounted system and the precision of the stylus-mounted system
Data Source
AI summary
An apparatus is disclosed to monitor movement of a held object in a virtual reality system. The apparatus comprises a primary tracking system with a first sensor to monitor movement of the user's hand, and a secondary tracking system with a second sensor to monitor a position of the held object. The position is measured in relation to the hand movement.