Multi-Perspective Eye Acquisition via Mirror Reflection
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Solution Overview
Problem
Single imaging devices in head-mounted displays often result in inaccurate biometric authentication and gaze tracking due to obstruction or occlusion of the eye, and the use of multiple devices increases production costs and computational complexity.
Innovation Solution
A system with multiple mirrors positioned around the eye to capture images from different perspectives, coupled with an imaging device and a mirror angle adjustment mechanism to ensure reliable eye imaging, allowing for accurate gaze tracking and biometric authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single imaging device is used, then production costs are reduced, but measurement precision of eye gaze and biometric authentication deteriorates due to occlusion
Solution Approach 1:
The imaging function is segmented across multiple mirrors positioned at different locations around the eye. Each mirror captures a different perspective of the eye, and the imaging device sequentially or simultaneously captures images from each mirror's reflection, achieving multi-perspective imaging without using multiple imaging devices
Solution Approach 2:
Mirrors are introduced as intermediary elements between the eye and the imaging device. The mirrors reflect light from different angles around the eye to the single imaging device, enabling the device to capture eye images from multiple perspectives without direct line-of-sight requirements
2Measurement precision
If multiple imaging devices are used, then measurement precision of eye gaze and biometric authentication is improved, but device complexity and computational processing requirements increase
Solution Approach 1:
Multiple imaging functions are merged into a single imaging device by using multiple mirrors to provide different viewing angles. The single imaging device captures images reflected from multiple mirrors, combining the capabilities of what would otherwise require multiple separate imaging devices
Solution Approach 2:
The system adds a spatial dimension to imaging by positioning mirrors at different locations around the eye. Instead of using multiple devices at different positions, the mirrors create virtual imaging positions through reflection, achieving multi-perspective imaging from a single device location
3Measurement precision
If multiple imaging devices are used, then measurement precision is improved, but loss of time increases due to additional data processing and fusion requirements
Solution Approach 1:
The imaging process is segmented across multiple mirrors that capture different perspectives simultaneously or sequentially. This segmentation allows the system to gather multiple views without requiring multiple imaging devices, reducing the computational burden of fusing data from multiple independent devices
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
The system provides robust and accurate gaze tracking and biometric authentication by capturing images of the eye from multiple angles, reducing occlusion issues and maintaining lower production costs compared to multi-device systems.
Implementation Method 1
a single imaging device that directly images an eye of a wearer of the head-mounted device may result in inaccurate biometric authentication of the wearer and/or tracking of a gaze of the wearer. Further, a single imaging device may not provide viable images that sufficiently capture, for example, an iris of the eye of the wearer
Data Source
AI summary
A device, such as a head-mounted device (HMD), may include a frame and a plurality of mirrors coupled to an interior portion of the frame. An imaging device may be coupled to the frame at a position to capture images of an eye of the wearer reflected from the mirrors. The HMD may also include a mirror angle adjustment device to adjust an angle of one or more of the mirrors relative to the imaging device so that the mirror(s) reflect the eye of the wearer to the imaging device.