AR Head Tracking via Sensor Fusion and Predictive Rendering
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Solution Overview
Problem
Current augmented reality (AR) systems face challenges in accurately localizing the position and orientation of objects, particularly due to high latency and low head-tracking accuracy, which can lead to motion sickness and unstable virtual object placement.
Innovation Solution
The proposed system includes a head-mounted AR display device equipped with sensors and processors that monitor head pose and orientation, using a combination of cameras, depth sensors, and electromagnetic tracking to accurately track the user's head and real objects in space, thereby enhancing the precision and stability of virtual content rendering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If head tracking accuracy is improved using sensors and processors, then virtual object placement stability is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple tracking technologies (electromagnetic tracking, optical tracking, inertial measurement) into a unified head tracking system. This integration allows the system to achieve high measurement precision for head pose and position while distributing the computational load across different sensor types, thereby managing device complexity through synergistic combination rather than relying on a single complex system
Solution Approach 2:
The patent introduces electromagnetic field emitters and sensors as intermediary elements between the user's head and the AR system's processing units. These intermediaries enable non-contact, high-precision tracking of head movements, improving measurement accuracy without requiring direct mechanical coupling or complex contact-based sensing systems
2Loss of time
If latency is reduced for real-time rendering, then AR experience stability is improved, but processing power requirements increase
Solution Approach 1:
The patent implements predictive algorithms that anticipate future head positions and orientations based on current motion trends. By pre-calculating rendering parameters for predicted viewpoints, the system reduces actual rendering latency without requiring sustained high processing power during rapid head movements, as the computational work is performed in advance based on predicted needs
3Measurement precision
If multiple sensors are added for better localization, then object localization accuracy is improved, but device weight increases
Solution Approach 1:
The patent utilizes electromagnetic fields as a lightweight sensing modality that provides high-precision localization data without adding significant mass. By changing the sensing parameter from mechanical or heavy electronic sensors to electromagnetic field detection, the system achieves improved object localization accuracy while minimizing the weight penalty associated with multiple physical sensors
Data Source
AI summary
Methods and systems for triggering presentation of virtual content based on sensor information. The display system may be an augmented reality display system configured to provide virtual content on a plurality of depth planes using different wavefront divergences. The system may monitor information detected via the sensors, and based on the monitored information, trigger access to virtual content identified in the sensor information. Virtual content can be obtained, and presented as augmented reality content via the display system. The system may monitor information detected via the sensors to identify a QR code, or a presence of a wireless beacon. The QR code or wireless beacon can trigger the display system to obtain virtual content for presentation.