Dynamic Visual Field Measurement Using Moving Targets
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Solution Overview
Problem
Existing techniques for visual field measurement do not account for the difference between the visual field for a moving target and a stationary target, which can affect driving assistance systems.
Innovation Solution
A method for determining a visual field by relatively moving a target with respect to a subject and determining the visual field based on the subject's line of sight direction at specific points in time, considering various parameters such as movement characteristics, line of sight direction, and environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a visual field inspection is performed by irradiating a windshield with light on a stationary target, then the measurement process is simple, but the measurement precision is insufficient for moving targets
Solution Approach 1:
The patent applies the dynamics principle by making the target move during visual field measurement. The moving target allows the system to capture the subject's line of sight changes over time and space, enabling accurate measurement of visual field in dynamic conditions. The target moves along a predetermined path while the subject tracks it, and the system records positional information at multiple time points to determine visual field boundaries.
2Measurement precision
If the visual field measurement accounts for moving target conditions, then the measurement precision improves, but the ease of operation decreases
Solution Approach 1:
The patent applies the self-service principle by having the subject themselves perform the tracking action. The subject naturally follows the moving target with their line of sight, and the system automatically records the positional information. This eliminates the need for complex manual operations by the operator, as the measurement process leverages the subject's own visual tracking behavior to gather necessary data.
Solution Approach 2:
The patent applies the preliminary action principle by pre-programming the target's movement path and characteristics before the measurement begins. The control device stores predetermined movement patterns, and the target automatically follows these patterns during measurement. This preliminary setup simplifies the actual measurement process, as the system already has the target trajectory prepared and only needs to capture the subject's response.
3Adaptability or versatility
If the visual field measurement is performed in dynamic situations with moving targets, then the adaptability improves, but the difficulty of detecting and measuring increases
Solution Approach 1:
The patent applies the intermediary principle by introducing a visible moving target as a mediator between the measurement system and the subject's line of sight. The target serves as a clear, trackable object that the subject can easily follow, making the invisible line of sight visible and measurable. The target's movement and the subject's tracking of it provide concrete positional data that the system can use to determine visual field boundaries without directly attempting to measure the intangible concept of line of sight.
Data Source
AI summary
A method for determining a visual field of a subject is provided. The method includes relatively moving a target with respect to the subject, and determining a visual field of the subject based on a position of the target at a point in time when the subject has directed a line of sight of the subject to the target relatively moving with respect to the subject.