Eye Detection Structured Light for 3D Eye Topography
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Solution Overview
Problem
Conventional eye trackers are limited to two-dimensional information acquisition, failing to measure eye relief in the Z direction and thus cannot generate a fine three-dimensional contour of the eye, which is crucial for accurate interpupillary distance and gaze point rendering in mixed reality systems.
Innovation Solution
An eye detection apparatus with a transmitting-side assembly that includes a light source and a light modulation element to generate patterned light beams forming discrete light spots on the eye, and a receiving-side assembly with a camera to capture these spots for creating three-dimensional topographical information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional eye tracker based on pupil corneal reflection is used, then the system structure is simple, but it can only acquire two-dimensional information and cannot measure eye relief in the Z direction
Solution Approach 1:
The patent transitions from two-dimensional pupil position detection to three-dimensional eye topography measurement by introducing structured light projection. The light modulation element projects patterned light onto the eye surface, and the camera captures the reflected pattern from multiple dimensions, enabling measurement of eye relief (Z direction) in addition to XY plane coordinates, thus achieving complete three-dimensional eye information acquisition
Solution Approach 2:
The patent introduces a light modulation element as an intermediary component between the light source and the eye. This element modulates the light to create structured patterns that carry spatial information, which then reflects off the eye surface and is captured by the camera. This intermediary mechanism enables the system to extract three-dimensional topographical information without requiring complex multi-camera setups
2Measurement precision
If structured light projection is used to achieve three-dimensional measurement, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The camera in the system serves multiple functions: it captures the projected light pattern for three-dimensional reconstruction, detects pupil position, and identifies corneal reflection points. This multi-functionality reduces the need for additional specialized sensors, thereby limiting the increase in device complexity while achieving precise eye relief measurement
Solution Approach 2:
The patent combines the eye tracking function and three-dimensional topography measurement function into a single integrated system. The same camera and optical path are used for both purposes, merging what could have been separate systems into one unified apparatus, thus reducing overall device complexity while maintaining measurement precision
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
Enables the acquisition of complete three-dimensional eye information, enhancing interpupillary distance measurement and gaze point accuracy, thereby improving interaction perception in mixed reality systems.
Implementation Method 1
a light modulation element, wherein the light modulation element is configured to modulate light emitted by the light source to generate a patterned light beam for forming discrete light spots on an eye
Implementation Method 2
a receiving-side assembly including a camera configured to acquire an eye image including an image of the discrete light spots to create three-dimensional topographical information of the eye
Data Source
AI summary
Embodiments of the disclosure provide an eye detection apparatus and an electronic device. The apparatus includes a transmitting-side assembly and a receiving-side assembly. The transmitting-side assembly includes a light source and a light modulation element, wherein the light modulation element is configured to modulate light emitted by the light source to generate a patterned light beam for forming discrete light spots on an eye. The receiving-side assembly includes a camera configured to acquire an eye image including an image of the discrete light spots to create three-dimensional topographical information of the eye.