Biometric Authentication Chart Near-Infrared Skin Reflection Patches
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Solution Overview
Problem
Existing skin color charts for biometric authentication do not effectively simulate near-infrared reflections across different skin tones, leading to inconsistent biometric authentication results due to varying light environments.
Innovation Solution
A chart with a substrate featuring first and second skin reflection patch parts that simulate near-infrared reflections of a predetermined wavelength for two distinct skin colors, allowing for the determination of a suitable light environment for biometric authentication by capturing images with a near-infrared camera and lighting apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional skin color chart is used for biometric authentication, then the chart structure is simple, but the authentication reliability is poor due to inability to simulate near-infrared reflections across different skin tones
Solution Approach 1:
The chart divides the surface into multiple patch parts, each with different skin color characteristics. Each patch part is designed to simulate the near-infrared reflection properties of specific skin tones, creating local variations in reflectance properties to improve authentication reliability across different skin types.
Solution Approach 2:
The chart incorporates patch parts with varying near-infrared reflectance parameters to represent different skin tones. By changing the reflectance parameters of individual patches, the chart can simulate how different skin types interact with near-infrared light, enabling more reliable biometric authentication.
2Reliability
If the chart includes multiple skin reflection patch parts for different skin colors, then the authentication reliability improves, but the manufacturing precision requirements increase
Solution Approach 1:
The chart is segmented into multiple discrete patch parts, each representing different skin color characteristics. This segmentation allows for standardized manufacturing of individual patches with specific reflectance properties, reducing overall manufacturing complexity while maintaining precision through modular assembly.
Solution Approach 2:
The chart creates simplified representations (copies) of human skin's near-infrared reflection properties through painted or printed patch parts. These copies capture the essential reflectance characteristics of different skin tones without requiring actual human skin samples, facilitating precise and consistent manufacturing.
3Measurement precision
If the chart is designed to simulate near-infrared reflections accurately, then the measurement precision improves, but the device complexity increases due to multiple patch parts
Solution Approach 1:
Different regions of the chart (patch parts) are designed with specific local qualities corresponding to different skin tones. Each patch part accurately simulates the near-infrared reflection properties of its corresponding skin type, enabling precise measurements across diverse skin characteristics while maintaining a relatively simple overall chart structure.
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
Enables accurate determination of a suitable light environment for biometric authentication across different skin tones, ensuring reliable imaging conditions for both liveness and in-vehicle biometric applications.
Implementation Method 1
a first skin reflection patch part that is formed on the substrate and that simulates reflection of near-infrared rays of a predetermined wavelength, in a skin of a living body of a first skin color
Data Source
AI summary
A chart includes: a substrate; a first skin reflection patch part that is formed on the substrate and that simulates reflection of near-infrared rays of a predetermined wavelength, in a skin of a living body of a first skin color; and a second skin reflection patch part that is formed on the substrate and that simulates reflection of the near-infrared rays of the predetermined wavelength, in the skin of the living body of a second skin color that is different from the first skin color. According to such a chart, it is possible to properly determine whether or not an imaging environment of an image is suitable for biometric authentication.