High-Resolution Eye-Tracking via Purkinje Reflection Segmentation
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Solution Overview
Problem
Current eye-tracking technologies provide only coarse estimation of gaze location, which is insufficient for applications like virtual and augmented reality, and existing Dual-Purkinje Image (DPI) tracking systems are cumbersome, expensive, and difficult to operate, limiting their use to specialized laboratories.
Innovation Solution
A new eye-tracking system and method that uses a minimal number of components, includes a gaze tracking device with an illumination source and camera to acquire digital images of the eye, and employs advanced processing algorithms to locate Purkinje reflections, predicting their positions to achieve high-resolution eye-tracking without moving parts, suitable for both table-mounted and head-mounted applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Dual-Purkinje Image (DPI) tracking is used to achieve high-resolution eye-tracking, then measurement precision is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The patent segments the eye-tracking measurement into two distinct Purkinje image components (P1 and P4) that are tracked separately. By dividing the tracking task into these two reflection points, the system achieves high-resolution gaze localization while using a simpler optical setup compared to traditional DPI systems that require complex multi-component arrangements.
Solution Approach 2:
The patent makes the eye-tracking system universal by enabling it to work in multiple configurations (table-mounted and head-mounted) and for various applications (scientific research, clinical use, virtual/augmented reality). This multi-functionality is achieved through a simplified design that removes the need for specialized laboratory equipment, allowing the same system to serve diverse purposes.
2Measurement precision
If Dual-Purkinje Image (DPI) tracking is used to achieve high-resolution eye-tracking, then measurement precision is improved, but ease of operation worsens
Solution Approach 1:
The patent implements self-service through automated calibration procedures that require minimal user intervention. The system automatically performs calibration by tracking the user's gaze across multiple points and computing the necessary transformation parameters, eliminating the need for operators to manually adjust complex optical components or perform tedious alignment procedures.
Solution Approach 2:
The patent replaces complex mechanical adjustment mechanisms with computational methods. Instead of requiring manual mechanical alignment of optical components, the system uses image processing algorithms and coordinate transformation computations to achieve precise gaze tracking, thereby simplifying operation while maintaining high measurement precision.
3Ease of operation
If traditional eye-tracking systems are used, then ease of operation is maintained, but measurement precision deteriorates
Solution Approach 1:
The patent changes the measurement parameters by tracking two specific Purkinje images (P1 and P4) instead of using traditional single-point or pupil-only methods. This parameter change enables high-resolution gaze localization while maintaining ease of operation through automated processing. The system computes gaze position based on the relative positions of these two reflection points, achieving superior precision without complicating the user interface or operation.
4Measurement precision
If high-resolution eye-tracking is implemented, then measurement precision is improved, but device complexity worsens
Solution Approach 1:
The patent extracts only the essential components needed for high-resolution eye-tracking: an illumination source, a camera, and processing algorithms to locate Purkinje images P1 and P4. By taking out and eliminating unnecessary complex components from traditional DPI systems, the patent achieves high measurement precision with a simplified device structure that can be implemented in both table-mounted and head-mounted configurations.
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 achieves high-resolution eye-tracking with robustness and precision, enabling accurate gaze localization over a large field of view, suitable for both scientific and clinical applications, and opens the potential for widespread use beyond specialized laboratories.
Implementation Method 1
running the gaze tracking process to locate at least two Purkinje reflections of the illuminating source from the eye in the images
Data Source
AI summary
A method for determining gaze location includes: providing a gaze tracking device including an illumination source to illuminate an eye of an observer at an angle of about 20 degrees to 40 degrees relative to a resting eye position of the eye, a camera or an imager includes at least one focusing lens, the camera or imager to acquire sequences of digital images of the eye, and a processor to run a gaze tracking process; and running the gaze tracking process to locate at least two Purkinje reflections of the illuminating source from the eye in the images. A gaze tracking system and a gaze tracking device are also described.