Biometric Authentication Lighting With Reflective Glare Reduction
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Solution Overview
Problem
In biometric authentication, such as face recognition, there is a need to brightly illuminate the subject while minimizing glare, which existing systems often fail to achieve effectively.
Innovation Solution
An authentication device that uses an illuminating unit to irradiate light, a reflecting unit to disperse the light, and an image-capturing unit to capture the reflected light, thereby reducing glare and enhancing illumination uniformity, allowing for high-accuracy biometric authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light is directly irradiated onto the subject from the front, then the subject is brightly illuminated, but glare increases and causes discomfort to the authentication subject
Solution Approach 1:
A reflecting plate is introduced as an intermediary between the light source and the subject. The light source irradiates light upward onto the reflecting plate, which then reflects the light onto the subject's face. This indirect illumination path eliminates direct glare while maintaining brightness, as the light reaches the subject through reflection rather than direct line-of-sight from the source.
2Illumination intensity
If the light source is positioned directly in front of the subject, then illumination is achieved, but shadows are formed on the subject's face
Solution Approach 1:
The illumination geometry is changed from a direct front-facing arrangement to an indirect overhead arrangement. The light source is positioned above the subject, irradiating light upward onto the reflecting plate, which then reflects light down onto the subject's face. This dimensional change in the light path eliminates shadow formation while maintaining uniform illumination coverage.
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
The device achieves bright illumination with reduced glare, minimizing shadow formation and improving the accuracy of biometric authentication, particularly face recognition.
Implementation Method 1
a reflecting means that reflects light irradiated from the illuminating means
Data Source
AI summary
An authentication device includes a light source irradiating light, a reflecting sheet reflecting the light irradiated from the light source, and a camera capturing an image of a subject irradiated with the light that has been reflected by the reflecting sheet, and performs biometric authentication using the image of the subject that has been captured by the camera