Mobile Device Eye Center of Rotation Measurement
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Solution Overview
Problem
Existing methods for determining the center of rotation of the eye require specialized and costly equipment, making it difficult for individuals to measure this parameter conveniently and cost-effectively, especially for applications like augmented reality glasses and diagnostic purposes.
Innovation Solution
A method using a mobile device with a camera and sensors to capture images of the eye from different positions, allowing for the determination of the center of rotation and eye diameter without the need for additional equipment, by integrating acceleration data and using existing hardware like smartphones or tablets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If specialized equipment is used to determine the center of rotation of the eye, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies universality by using a mobile device with existing multi-functional components (camera, acceleration sensor, display) to perform eye center of rotation measurement. The camera captures eye images, the acceleration sensor tracks device movement, and the display provides visual feedback - all standard components that serve multiple purposes, eliminating the need for specialized single-function measurement equipment.
Solution Approach 2:
The mobile device performs self-calibration and self-measurement by using its own camera and sensors. The system captures images of the eye, tracks its own movement through acceleration sensors, and processes the data autonomously to determine the center of rotation, eliminating the need for external specialized measurement devices.
2Measurement precision
If specialized equipment is used to determine the center of rotation of the eye, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent uses a universal mobile device that everyone possesses instead of specialized measurement equipment. The camera, acceleration sensor, and display are standard components that make the device accessible and easy to operate, while still achieving precise eye measurement through software processing.
Solution Approach 2:
The patent replaces complex mechanical measurement systems with a software-based solution running on a mobile device. The camera captures images, the acceleration sensor records movement, and software algorithms process this data to determine the center of rotation, substituting mechanical complexity with computational processing that is easier to operate.
3Measurement precision
If a calibrated camera system with fixed target is used, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
Instead of fixing the camera and moving the target, the patent inverts the approach by moving the camera (mobile device) and keeping the target (eye) stationary. This inversion simplifies the system by eliminating the need for a fixed calibrated camera setup and external targets, using the mobile device's own movement tracking capabilities for measurement.
Solution Approach 2:
The mobile device serves multiple functions: it acts as the camera, the target display, and the movement tracking system through its acceleration sensor. This multi-functionality eliminates the need for separate calibrated camera systems and external targets, reducing overall system complexity while maintaining measurement precision.
Data Source
AI summary
Computer implemented methods for mobile device, mobile devices and computer programs are utilized for determining the center of rotation of the eye. An image of an eye of a person is captured in at least two positions of the mobile device, and the position of the center of rotation is determined based on the images and the position. In a similar manner, optionally a pupil position may be determined.