Dynamic Lighting Position for Eye Tracking Glare Reduction
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Solution Overview
Problem
Traditional eye gaze tracking systems face interference from environmental factors and variable lighting conditions, such as glare from eyeglasses, which can cause poor tracking performance and intermittent operation.
Innovation Solution
An eye tracking device with a dynamic lighting position that detects changes in lighting conditions, such as glare, and adjusts the position of the light sources to maintain clear images of the eyes for accurate gaze characteristic determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed light source position is used for eye tracking, then the system structure is simple, but tracking performance deteriorates under variable lighting conditions and glare
Solution Approach 1:
The patent implements dynamic light source positioning by providing multiple light sources at different positions and selectively activating them based on detected lighting conditions. The system transitions from a fixed light source to a dynamic configuration where the active light source position changes in real-time to maintain optimal eye illumination despite environmental lighting variations and glare conditions.
Solution Approach 2:
The system employs feedback mechanisms by continuously monitoring lighting conditions and glare in the captured images, then using this information to determine which light source position should be active. This closed-loop control ensures the light source configuration adapts to current environmental conditions, maintaining reliable tracking performance.
2Measurement precision
If environmental lighting conditions are not monitored, then the system operation is simple, but tracking accuracy deteriorates due to glare and variable lighting
Solution Approach 1:
The system performs preliminary analysis of lighting conditions and glare in captured images before finalizing gaze direction measurements. By detecting and characterizing environmental lighting factors in advance, the system can compensate for their effects and maintain measurement precision under varying conditions.
Solution Approach 2:
The system changes operational parameters (which light source position is active) based on detected lighting conditions. By adjusting the light source position parameter in response to environmental changes, the system maintains optimal illumination of the eyes and preserves gaze direction measurement accuracy.
3Object-affected harmful factors
If light source position is dynamically adjusted, then resistance to lighting interference is improved, but system complexity increases
Solution Approach 1:
The patent implements dynamic light source positioning by providing multiple light sources at different positions and selectively activating them based on detected lighting conditions. The system transitions from a fixed light source to a dynamic configuration where the active light source position changes in real-time to maintain optimal eye illumination despite environmental lighting variations and glare conditions.
Solution Approach 2:
The system uses the detected glare and lighting conditions information not just as problematic data but as useful feedback to determine optimal light source positioning. By converting the harmful effect information into a control signal for light source selection, the system transforms the problem into a solution that actively compensates for environmental interference.
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 effectively minimizes interference from changing lighting conditions, ensuring continuous and accurate eye gaze tracking by dynamically adjusting the lighting position in real-time, thereby improving tracking performance.
Implementation Method 1
illuminating the eyes by emitting light from one or more light sources
Implementation Method 2
detecting reflections of the emitted light off of the eyes with a sensor
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2
AI summary
Aspects of the present disclosure relate to eye tracking systems and methods which track eyes by illuminating the eyes using a light source and detecting the eye illuminations using a sensor. Implementations of the present disclosure may utilize a light source with a dynamic lighting position to account for changes in lighting conditions during the tracking which interfere with detection of the eye illuminations, such as reflections in glasses which may obscure a user's eyes.