Eyeball Movement Analysis Using Segmented Iris and Pupil Tracking

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Solution Overview

Problem

Existing eyeball movement analysis systems can measure rotational angles but fail to accurately calculate translational distances due to the complexity of eyeball movement, which involves both rotation and translation.

Innovation Solution

An eyeball movement analysis system and method that captures images of the eyeball at a reference and moved location, calculating rotational and translational distances using specific equations (y=0.52+0.07x−8.14e−4x2 for one range and y=0.46+0.05x−4.93e−4x2 for another range), where y is the translational distance and x is the rotational angle, considering the orbit and eyeball dimensions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If only rotational angle measurement is implemented using iris pattern, then rotational movement can be measured, but translational distance cannot be measured

Engineering Contradiction:

Improverotational angle measurementVSAvoidtranslational distance information

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent segments the eyeball movement analysis into two distinct components: rotational angle measurement (using iris pattern) and translational distance measurement (using pupil center position). By dividing the measurement task into separate segments, the system can independently optimize each measurement method and combine them to achieve complete movement analysis.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent makes the image capturing system multi-functional by enabling it to perform both rotational angle measurement (through iris pattern recognition) and translational distance measurement (through pupil center tracking) using the same captured images, thereby eliminating the need for separate measurement systems.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of manufacture

If a single equation is used for translational distance calculation, then the calculation process is simplified, but accuracy decreases for different eyeball dimensions

Engineering Contradiction:

Improvecalculation process simplicityVSAvoidtranslational distance accuracy

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The patent applies local quality by using different calculation equations tailored to specific eyeball size categories. Instead of a universal equation, the system selects from multiple equations (Eq. 1, Eq. 2, Eq. 3) based on the measured eyeball dimensions, ensuring each calculation uses the most appropriate formula for that specific case.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the parameters of the calculation system by selecting different equations based on eyeball size parameters. The system measures eyeball diameter and axial length, then uses these parameters to determine which equation to apply, thereby adapting the calculation method to the specific physical characteristics of each subject.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11164322B2Eyeball movement analysis system and eyeball movement analysis method

Publication Date: 2021.11.02 INDUSTRY UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY

AI summary

Disclosed is an eyeball movement analysis system. The eyeball movement analysis system includes an image capturing unit configured to acquire a first image of an eyeball at a reference location and acquire a second image of the eyeball at a moved location, and an eyeball movement analyzing unit configured to calculate a rotational angle of the eyeball and a translational distance of the eyeball in a process of moving the eyeball from the reference location to the moved location through comparison of the first image and the second image.