Eye Tracking Device Coordinate System Correction
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Solution Overview
Problem
Existing eye tracking technologies face challenges in accurately measuring visual lines due to individual differences in eyeball shape, which affect detection accuracy and require correction methods that are not fully independent of gaze point positional relationships.
Innovation Solution
An eye tracking device comprising a light source, image-capturing unit, and correction unit that transforms visual line information from a world coordinate system into a correction coordinate system to correct detection errors caused by individual eyeball differences, using correction information derived from multiple gaze points to enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If correction is performed using individual error based on corneal reflection method, then detection accuracy is improved, but the correction is affected by positional relationship between gaze points reducing freedom of gaze destination
Solution Approach 1:
The patent transforms visual line information from world coordinate system to correction coordinate system, changing the reference frame parameters. This allows correction to be performed independently of the positional relationship between gaze points in the world coordinate system, thereby maintaining detection accuracy while increasing freedom of gaze destination selection
Solution Approach 2:
The patent introduces a correction coordinate system as an intermediary between the world coordinate system and the final visual line correction. This intermediate coordinate system serves as a mediator that decouples the correction process from the specific positional relationships of gaze points, allowing more flexible gaze destination selection while maintaining correction accuracy
2Measurement precision
If multiple gaze points are used for correction, then correction accuracy is improved, but the complexity of processing increases
Solution Approach 1:
The patent segments the correction process into distinct stages: transforming visual line information to correction coordinate system, performing correction calculations using multiple gaze points, and transforming back to world coordinate system. This segmentation allows systematic processing of multiple gaze points while managing computational complexity through structured decomposition of the correction algorithm
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 improves detection accuracy and increases the freedom of gaze destination by independently correcting visual line information, regardless of the positional relationship between gaze points, thereby addressing the limitations of existing methods.
Implementation Method 1
a light source (130) that emits light to form a corneal reflex point on an eyeball (200) of an object person (100) who gazes at a predetermined gaze point on a display (20), light from the light source (130) being reflected from the eyeball (200)
Data Source
AI summary
An eye tracking method in the disclosure comprises an image-capturing step of capturing a facial image including an eyeball of an object person, light from a light source that emits the light to form a corneal reflex point on the eyeball of the object person who gazes at a predetermined gaze point being reflected from the eyeball, a detecting step of calculating visual line information in a world coordinate system using the facial image captured in the image-capturing step and a correcting step of transforming the visual line information in the world coordinate system calculated in the detecting step into visual line information in a correction coordinate system that is a coordinate system different from the world coordinate system, and correcting the visual line information in the correction coordinate system using correction information for correcting a detection error caused by an individual difference of the eyeball.