Data Glasses Viewing Direction Determination Using Pupil Contour Ellipse Comparison
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Solution Overview
Problem
Existing methods for determining the instantaneous viewing direction of users with data glasses, particularly those using virtual retina displays, face challenges in resource efficiency and robustness, especially in handling variations in eye position and movement.
Innovation Solution
The method involves projecting substantially parallel infrared laser beams onto the user's eye, capturing two-dimensional images, and determining pupil contours to ascertain the instantaneous viewing direction by comparing the elliptical shape of the pupil contour with a reference shape, allowing for efficient calculation of eye models and adaptive tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex eye models are used to determine viewing direction, then measurement precision improves, but use of energy and computational resources increases
Solution Approach 1:
The patent extracts only the essential geometric parameters needed for viewing direction determination by comparing pupil contour ellipses, rather than using complete complex eye models. This selective extraction of necessary information reduces computational overhead while maintaining measurement precision for the specific task of view vector determination
Solution Approach 2:
Instead of using complex forward models to predict pupil appearance from eye parameters, the patent inverts the approach by directly measuring pupil contour ellipses and deriving viewing direction from the geometric comparison, simplifying the computational pathway
2Measurement precision
If traditional pupil recognition methods are used, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent extracts only the essential geometric parameters needed for viewing direction determination by comparing pupil contour ellipses, rather than using complete complex eye models. This selective extraction of necessary information reduces computational overhead while maintaining measurement precision for the specific task of view vector determination
Solution Approach 2:
The patent changes the approach from using complex physiological eye parameters to using simple geometric ellipse parameters for pupil contours. This parameter transformation simplifies the system while maintaining the precision needed for viewing direction calculation
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 approach enables a simple, resource-efficient, and robust determination of the view vector, facilitating hands-free operation and adaptive tracking of image content, while maintaining high user friendliness and accuracy even with displacements of the data glasses.
Implementation Method 1
capturing two-dimensional images from the infrared laser beams reflected back by the eye of the user
Data Source
AI summary
A method for determining a current viewing direction of a user of a pair of data glasses having a virtual retina scan display. The method includes at least the method steps: projecting at least substantially parallel infrared laser beams onto an eye of a user of the data glasses, acquiring two-dimensional images from the infrared laser beams reflected back by the eye of the user, and determining pupil contours in the acquired two-dimensional images. The instantaneous viewing direction of the user of the data glasses is ascertained from a comparison of an instantaneous elliptical shape of the pupil contour with an elliptical shape of a reference pupil contour.