HMD Tracking Delay Measurement for Virtual Hand Motion Sync
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Solution Overview
Problem
Existing head-mounted displays (HMDs) in flight simulators face challenges in accurately tracking body part movements, leading to false visual cues and motion sickness due to undesirable position changes and vibration, which affect the realism and effectiveness of the simulation experience.
Innovation Solution
A method and apparatus for measuring and quantifying body part tracking delay by generating a virtual environment on a test stand, using sensors to track hand motion, updating the virtual environment based on real-world positions, and adjusting the HMD luminance to measure and encode signaling from contact sensors and light sensors, thereby determining the delay within a threshold distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If body part tracking is implemented in HMD to enhance immersion, then realism is improved, but tracking delay causes false visual cues and motion sickness
Solution Approach 1:
The system performs preliminary measurement of tracking delay by displaying a test pattern and measuring the time difference between actual body part movement and its virtual representation. This advance measurement allows the system to compensate for the identified delay, preventing motion sickness before it occurs during normal operation.
Solution Approach 2:
The system continuously monitors the position of body parts using sensors and compares them with their virtual representations in real-time. This feedback mechanism allows the system to detect and correct tracking delays, ensuring synchronization between physical and virtual environments and eliminating false visual cues.
2Measurement precision
If tracking sensitivity is increased to reduce delay, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system introduces a test pattern as an intermediary element that simplifies the measurement process. By using a high-contrast test pattern that easily distinguishes physical from virtual representations, the system achieves accurate delay measurement without requiring complex sensing algorithms or multiple sensors.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for precise measurement and compensation of tracking delays, reducing false visual cues and motion sickness, ensuring accurate and realistic simulation experiences by maintaining synchronization between real-world and virtual environments.
Implementation Method 1
receiving, by the DAQ, from a light sensor mounted on the model head, signaling based on changing the luminance of the HMD
Data Source
AI summary
A method, apparatus, and medium are provided. The method includes generating a virtual environment (VE) including at least a first shape that precisely fills a virtual field of view from the first virtual viewpoint, receiving from a first hand contact sensor, signaling indicating contact, receiving from a second hand contact sensor, signaling indicating contact, where the second hand contact sensor is a first distance from the first hand contact sensor, tracking the operator's hand motion and updating the VE based on the position of the operator's hand, changing a luminance of the HMD when the virtual hand is within a threshold distance from a virtual representation of the second hand contact sensor, receiving signaling based on changing the luminance of the HMD, and generating a data file encoding the signaling from the first hand contact sensor, the second hand contact sensor, and the light sensor.