Multiple-IMU Angular Acceleration for Motion-Synchronized Mixed Reality
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Solution Overview
Problem
Conventional VR systems face challenges such as motion sickness, disorientation, high computational burden, and inability to leverage real-world sensory data, while AR and MR systems struggle with integrating virtual and real environments accurately and maintaining persistence.
Innovation Solution
Systems and methods for calculating angular acceleration using multiple inertial measurement units (IMUs) to estimate the position of a wearable head device, allowing for precise presentation of virtual content in mixed reality environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If VR systems present a full 3D virtual environment to replace the real environment, then user immersion is improved, but computational burden increases and motion sickness occurs
Solution Approach 1:
The system segments the virtual environment rendering by using multiple IMUs to handle different spatial zones independently. Each IMU processes inertial data for its specific region, dividing the computational load and enabling efficient presentation of virtual content without requiring full 3D environment rendering.
Solution Approach 2:
The patent introduces angular acceleration calculation as an intermediary mechanism between raw inertial data and virtual content presentation. By computing angular acceleration from multiple IMUs, the system creates a mediator layer that translates complex sensor data into precise head position estimates, reducing the computational burden on the virtual environment rendering system.
2Reliability
If VR systems replace the real environment with virtual content, then immersion is enhanced, but motion sickness and disorientation increase
Solution Approach 1:
The system implements feedback by continuously monitoring angular acceleration and head position through multiple IMUs. This real-time feedback mechanism allows the virtual content presentation to adapt to actual user head movements, maintaining synchronization between visual stimuli and vestibular sensations, thereby reducing motion sickness and disorientation.
Solution Approach 2:
The patent applies preliminary action by calculating angular acceleration and estimating head position before presenting virtual content. This anticipatory computation ensures that virtual content is ready and properly positioned according to predicted head movements, preventing delays that could cause disorientation or motion sickness.
3Adaptability or versatility
If AR/MR systems integrate virtual content with real environment, then real-world sensory data utilization is improved, but integration accuracy and persistence maintenance become challenging
Solution Approach 1:
The system merges data from multiple IMUs with real-world sensory input to create a unified spatial understanding. By combining inertial measurements from different units, the system achieves more accurate head position estimation that integrates virtual content placement with real environment context, improving both adaptability and measurement precision.
Solution Approach 2:
The patent uses a composite approach by integrating data from multiple inertial measurement units with different measurement axes. This composite sensing strategy combines the strengths of each IMU to achieve more accurate and reliable head position estimation, enhancing the precision of virtual-real environment integration.
Data Source
AI summary
Disclosed herein are systems and methods for calculating angular acceleration based on inertial data using two or more inertial measurement units (IMUs). The calculated angular acceleration may be used to estimate a position of a wearable head device comprising the IMUs. Virtual content may be presented based on the position of the wearable head device. In some embodiments, a first IMU and a second IMU share a coincident measurement axis.