Contactless Biometric Print Capture With Angled Lighting
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Solution Overview
Problem
Contactless biometric devices struggle with the prominent presence of skin wrinkles in captured images, leading to errors in feature extraction.
Innovation Solution
A contactless biometric device is designed with specific angles between the image-acquiring device and lighting means, minimizing wrinkle visibility by directing light reflections away from the image sensor and towards the user compartment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If contactless imaging is used to capture biometric prints, then user convenience and hygiene are improved, but skin wrinkles become prominently visible in the captured images causing errors in feature extraction
Solution Approach 1:
The patent applies parameter changes by optimizing the lighting angle (alpha between 30-60 degrees from the optical axis) and light source positioning to minimize wrinkle visibility. This involves changing the illumination parameters rather than the contactless imaging itself, allowing the system to maintain both contactless operation and high measurement precision by controlling how light interacts with the skin surface
2Device complexity
If contactless imaging is used to capture biometric prints, then device simplicity is improved, but wrinkle visibility increases leading to imaging errors
Solution Approach 1:
The patent maintains device simplicity while reducing wrinkle visibility by changing illumination parameters - specifically positioning light sources at optimized angles (alpha between 30-60 degrees) relative to the optical axis. This parameter optimization allows the simple contactless device structure to produce high-quality images without requiring complex mechanical components
Solution Approach 2:
The patent introduces light as an intermediary element to solve the wrinkle visibility problem. By carefully controlling the illumination angle and direction, the light mediator highlights the biometric features while minimizing the appearance of wrinkles, effectively decoupling the simplicity of contactless imaging from the quality of the captured image
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 effectively reduces the visibility of skin wrinkles in captured images, enhancing the accuracy of biometric feature extraction.
Implementation Method 1
minimizing wrinkle visibility by directing light reflections away from the image sensor and towards the user compartment
Data Source
AI summary
The invention relates to a contactless device (1) for capturing a biometric print, said device comprising a user region (10) and an electronic compartment (20), the user region (10) being suitable for receiving a hand portion of a user according to an orientation vector (V), the electronic compartment (20) comprising lighting means and an image-acquiring device (40), the image-acquiring device (40) being oriented along an optical axis (A1) making a first angle (B1) to the orientation vector (V), the lighting means comprising a light source (31) oriented along a lighting axis (A31) such that the projection (PA31) of said lighting axis (A31) in the plane defined by the orientation vector (V) and the optical axis (A1) makes a second angle (B31) to the orientation vector (V), the first angle (B1) being smaller than or equal to eighty degrees, the second angle (B31) being smaller than or equal to eighty degrees.