Head Tracking Eyewear Using Light Blob Correlation
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Solution Overview
Problem
Conventional head tracking systems are inadequate for precise tracking of a user's head position, especially when moving laterally, and often suffer from false positives due to additional reflections from eyewear glass surfaces, which can distort the perspective in horizontal perspective images.
Innovation Solution
A system using at least three emitters positioned on a tracking device, such as eyewear, and sensors coupled to a display device to detect light blobs and assess their position/orientation, with a processor correlating these to maintain accurate perspective and minimize distortion by using a bounding function to distinguish intended reflections from spurious ones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional head tracking systems are used to track user head position, then basic tracking functionality is provided, but tracking precision deteriorates when moving laterally and false positives occur due to reflections from eyewear glass surfaces
Solution Approach 1:
The tracking system segments the detection task by using multiple sensors (at least two sensors) to detect light blobs from multiple emitters (at least three emitters). This segmentation allows the system to cross-validate detections and distinguish true reflector positions from spurious reflections, thereby improving both tracking precision and reducing false positives.
Solution Approach 2:
The patent introduces a processor as an intermediary that correlates light blob positions from multiple sensors and emitters. This intermediary component assesses the three-dimensional position and orientation of the head by mathematically correlating the detected light blobs, filtering out false positives from glass reflections and improving overall tracking reliability.
2Measurement precision
If emitters are added to improve tracking accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The emitters on the eyewear serve multiple functions: they provide tracking markers for position and orientation detection, and their structured arrangement (at least three emitters in a known configuration) enables both lateral movement tracking and depth perception. This multi-functionality improves tracking accuracy without proportionally increasing device complexity.
Solution Approach 2:
The system transitions from two-dimensional image plane tracking to three-dimensional spatial tracking by using at least three emitters arranged in a known configuration and detecting their light blobs with multiple sensors. This dimensional enhancement provides accurate depth and orientation information while maintaining manageable system complexity through mathematical correlation.
3Reliability
If multiple sensors are used to reduce false positives, then reliability improves, but device complexity increases
Solution Approach 1:
The patent merges the detection capabilities of multiple sensors into a unified tracking system where the sensors work together to detect light blobs from multiple emitters. By combining their detections and correlating the results through a processor, the system achieves improved reliability in distinguishing true reflector positions from spurious reflections, while the integrated approach prevents excessive complexity multiplication.
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 system effectively tracks the user's head position and orientation, reducing image distortion and false positives, ensuring accurate three-dimensional illusions even when viewing from non-perpendicular angles, thus enhancing the realism of horizontal perspective images.
Implementation Method 1
A system using at least three emitters positioned on a tracking device, such as eyewear, and sensors coupled to a display device to detect light blobs
Implementation Method 2
The surface may be positionable, during use, with reference to the display device... detect light received from at least three of the emitters as light blobs
Data Source
AI summary
In some embodiments, a system for tracking with reference to a three-dimensional display system may include a display device, an image processor, a surface including at least three emitters, at least two sensors, a processor. The display device may image, during use, a first stereo three-dimensional image. The surface may be positionable, during use, with reference to the display device. At least two of the sensors may detect, during use, light received from at least three of the emitters as light blobs. The processor may correlate, during use, the assessed referenced position of the detected light blobs such that a first position/orientation of the surface is assessed. The image processor may generate, during use, the first stereo three-dimensional image using the assessed first position/orientation of the surface with reference to the display. The image processor may generate, during use, a second stereo three-dimensional image using an assessed second position/orientation of the surface with reference to the display.