Spectacle Camera Positioning for Pupil Detection Accuracy
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Solution Overview
Problem
Conventional eye-tracking spectacles face challenges in accurately detecting pupil positions across diverse ethnic groups due to varying nose shapes and eye configurations, leading to interference issues with eyelashes, eyelids, and cheekbones, as well as distortion in the field of view, which affects measurement accuracy and comfort of wear.
Innovation Solution
The spectacles feature eye detection cameras positioned within the nose frame at specific angles (17.5° to 22.5° relative to the Z axis) and coordinates (3 mm to 15 mm along the Z axis), allowing for detection of pupil centers across different ethnicities without protruding parts, reducing interference and distortion, and enabling inconspicuous wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the camera is arranged in the nose frame at higher positions, then the interference from eyelashes and eyelids is reduced, but the interference from cheekbones increases and the field of view becomes distorted
Solution Approach 1:
The patent applies parameter changes by precisely controlling the Z-axis coordinate (distance from the highest point of the nose frame) within the range of 3mm to 15mm, and the angle beta between 17.5° to 22.5°. This optimization balances the trade-off between reducing eyelash/eyelid interference (which requires higher positions) and avoiding cheekbone interference and distortion (which occurs at extreme positions), thereby achieving improved pupil detection accuracy without introducing new harmful factors.
2Adaptability or versatility
If the eye detection cameras are positioned to accommodate diverse ethnic groups, then the adaptability is improved, but the device complexity increases due to varying nose shapes and eye configurations
Solution Approach 1:
The patent achieves universality by defining a standardized coordinate system and specific parameter ranges (Z-axis: 3-15mm, angle beta: 17.5°-22.5°) that work across diverse ethnic groups. Instead of creating multiple specialized configurations for different populations, the invention uses a single unified configuration that accommodates variations in nose shapes and eye configurations through the optimized parameter ranges, thereby improving adaptability without increasing device complexity.
3Object-affected harmful factors
If protruding parts such as cameras and cables are minimized, then the safety and comfort of wear is improved, but the measurement accuracy may be compromised
Solution Approach 1:
The patent applies the nesting principle by integrating the eye detection cameras within the nose frame structure itself, rather than having them protrude outward. The cameras are positioned at specific Z-axis coordinates (3-15mm from the highest point) and angles (beta: 17.5°-22.5°), effectively nesting the measurement devices within the existing frame geometry. This eliminates protruding parts that could cause safety issues or discomfort while maintaining measurement accuracy through precise angular and positional configuration.
Data Source
AI summary
The present invention concerns improved spectacles, system and method for eye tracking able to detect the pupil position of different types of wearers. The detection of the pupil is improved over the prior art on the basis of a new specific position of the eye cameras on the spectacles frame.