6DOF Hand-Held Tracking via Wrist Coupling
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Solution Overview
Problem
Current hand-held device tracking systems in augmented and virtual reality environments face challenges with high power consumption and computational requirements due to the need for high-frame rate tracking, which limits battery life and increases costs, especially when using optical signals that can be obscured by object motion.
Innovation Solution
A 6DOF hand-held device tracking system that couples a 3DOF wrist-based device with a 3DOF hand-held device, using inverse kinematics to calculate positional and orientational data, reducing the need for high-frame rate tracking on the hand and allowing for lower power consumption by placing the tracking target on the wrist rather than the hand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-frame rate tracking is used to track hand-held devices, then tracking accuracy is improved, but power consumption and computational resources increase
Solution Approach 1:
The system divides tracking into two segments: high-frame-rate optical tracking for hand-held devices when needed, and lower-frame-rate tracking for other devices. The hand-held device tracker operates independently at high frame rates only when the device is in use, while other trackers can operate at lower frame rates, reducing overall power consumption while maintaining accuracy when required.
Solution Approach 2:
The hand-held device tracker activates periodically or on-demand based on device usage rather than continuously operating at high frame rate. The system can switch between high-frame-rate tracking mode and lower-power mode, reducing average power consumption while maintaining tracking accuracy during active periods.
2Measurement precision
If high-frame rate tracking is used to track hand-held devices, then tracking accuracy is improved, but computational resources increase
Solution Approach 1:
The system segments tracking computations by device type and usage pattern. Hand-held device tracking computations are performed separately from other device tracking, allowing the system to allocate computational resources efficiently. The hand-held tracker uses dedicated hardware or processing units that operate independently, reducing the computational burden on the main system processor.
3Difficulty of detecting and measuring
If optical signals are used for tracking, then tracking capability is improved, but reliability decreases when signals are obscured by object motion
Solution Approach 1:
The system uses visible light sources as intermediaries to enhance optical tracking. By placing visible light sources on or near the hand-held device, the system creates a more reliable optical signal that can be detected even during rapid motion. The light sources act as mediators between the tracker and the device, ensuring consistent detection despite motion-induced obscuration.
Data Source
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Figure 3~4b
AI summary
A system and method enable an electronic device to determine six-degree of freedom (6DOF) of a hand-held controller. The device includes one or more tracking devices and a processor. The one or more tracking devices are configured to indicate a first three-degree of freedom (3DOF) information regarding an orientation tracker device, and indicate a second 3DOF information regarding the hand-held controller. The processor is configured to determine a six-degree of freedom (6DOF) information of the hand-held controller as a function of the first 3DOF information and the second 3DOF information, wherein the orientation tracker device is different than the hand-held controller.