Eye-Gaze and Head-Motion Sensing for Effective Visual Field Detection
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Solution Overview
Problem
Existing technologies struggle to accurately detect an individual's effective visual field, which varies significantly based on internal state and personal differences, making it difficult to assess this field effectively.
Innovation Solution
A visual-line-movement-related-value-acquisition device that utilizes eye and head motion data to determine a visual line movement-related value, incorporating a coordinated motion analysis to derive an effective visual field index, accounting for individual characteristics and situational changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If head movement angle is used to determine effective visual field, then visual field can be estimated, but it does not reflect actual visual line direction when head and visual line movements differ
Solution Approach 1:
The patent introduces a camera as an intermediary device to capture the subject's eye images. Instead of directly measuring head movement, the system uses the camera to obtain visual line direction information from eye images, which serves as a mediator between the subject's actual gaze and the measurement system.
Solution Approach 2:
The patent replaces the mechanical head movement measurement approach with an optical/image processing approach. By using a camera to capture eye images and processing these images to determine visual line direction, the system substitutes mechanical measurement with optical and computational methods, achieving higher precision without significantly complicating operation.
2Measurement precision
If eye image acquisition is added to determine visual line direction, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent makes the camera serve multiple functions: it captures both the subject's eye images for visual line determination and records the overall scene for later analysis. This multi-functionality reduces the need for separate specialized devices, thereby limiting the increase in device complexity while still achieving precise visual line measurement.
Solution Approach 2:
The system creates a visual copy of the eye's appearance through camera imaging. By capturing and analyzing the image copy of the eye rather than directly measuring the physical eye position, the system achieves precise visual line direction determination while keeping the physical interaction minimal and the device structure relatively simple.
3Measurement precision
If visual line movement data is collected continuously, then effective visual field accuracy improves, but information processing load increases
Solution Approach 1:
The patent performs preliminary actions by pre-defining multiple candidate effective visual field patterns and their corresponding coordinate relationships. Instead of processing all possible visual line movements from scratch, the system has these patterns prepared in advance, allowing for more efficient matching and determination of the actual effective visual field during operation.
Solution Approach 2:
The system determines visual line direction by analyzing specific key features in eye images (such as pupil position and iris patterns) rather than processing every pixel or detail. This partial action approach focuses computational resources on the most informative aspects of the eye images, maintaining measurement precision while reducing overall data processing load.
Data Source
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AI summary
A structure in which an effective visual field of a person can be detected is achieved. A visual-line-movement-related-value-acquisition device 220 comprises a database configured to store a relationship between the subject's visual line movement-related value and the coordinated motion-related value in advance, and configured to acquire a subject's visual line movement-related value when a coordinated motion-related value is a predetermined value from the database by using a relationship between the acquired subject's visual line movement-related value and the acquired coordinated motion-related value, to thereby acquire an index related to an effective visual field of the subject.