Eye Tracking Sensor Calibration for Wearable Displays
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Solution Overview
Problem
Current wearable computing systems with head-mounted displays face challenges in accurately determining eye positions and tracking gaze directions, especially in environments with varying lighting conditions and complex eye movements, which affects their usability in applications like augmented and virtual reality.
Innovation Solution
The implementation of electromagnetic emitter/sensors (EESs) that emit and detect electromagnetic radiation to determine eye positions by analyzing glint patterns, allowing for precise calculation of pupil and iris positions, and integrating ambient light sensors to adjust emission parameters for improved detection in different lighting scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromagnetic emitter/sensors are used to detect eye positions, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The electromagnetic emitter/sensor system is designed to perform multiple functions: emitting electromagnetic radiation, detecting reflected radiation, determining eye position, and adapting to lighting conditions. By consolidating these functions into a single integrated system rather than separate components, the patent reduces overall device complexity while maintaining high measurement precision for eye tracking.
Solution Approach 2:
The system dynamically adjusts emission parameters of the electromagnetic radiation based on detected ambient lighting conditions. This parameter adaptation allows the sensor to maintain optimal measurement precision across varying environments without requiring multiple fixed-configuration sensors, thereby reducing device complexity.
2Adaptability or versatility
If calibration is performed in response to events, then adaptability is improved, but loss of time increases
Solution Approach 1:
The system performs calibration in advance in response to detected events (such as changes in lighting conditions or user actions). By proactively calibrating before the actual eye tracking measurement begins, the system adapts to current environmental conditions without causing time loss during critical measurement periods. The calibration is prepared beforehand so that when measurement is needed, the system is already optimized.
Solution Approach 2:
The calibration process is triggered periodically or event-driven rather than continuously. This approach allows the system to adapt to changing lighting conditions at appropriate intervals, maintaining adaptability while minimizing the total time spent on calibration. The periodic/event-based calibration ensures the system remains responsive without constant recalibration overhead.
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 method enables accurate and reliable eye tracking, enhancing the usability of wearable computing systems in various environments and applications, including augmented and virtual reality, by providing precise gaze direction data and adapting to lighting conditions.
Implementation Method 1
receiving data indicative of electromagnetic radiation reflected from a human eye at the sensor
Data Source
AI summary
Example methods and systems determine a position of a portion of a human eye based on electromagnetic radiation reflected from the surface of the human eye. A sensor associated with a computing device can be calibrated in response to an event. The computing device can receive data indicative of electromagnetic radiation reflected from a human eye. The computing device can determine a position of a portion of the human eye based on the received data indicative of electromagnetic radiation. The computing device can generate an indication including the position of the portion of the human eye. The computing device can transmit the indication from the computing device. In some embodiments, the data indicative of electromagnetic information can be provided by electromagnetic emitter/sensors mounted on a wearable computing device directed toward a human eye of a wearer of the wearable computing device.