Dual-Wavelength Vein Pattern Sensor for Fake Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hand vein pattern recognition systems cannot reliably distinguish between real and fake vein patterns, as they rely solely on infrared images and fail to account for the differences in light reflection properties between real and artificial patterns.
Innovation Solution
A dual-sensor system that captures both infrared and visible light images of a hand vein pattern, comparing the degree of matching between the two to classify the pattern as real or fake, utilizing near-infrared light to penetrate the skin and visible light to detect surface-based fakes, and employing a processor unit to determine the authenticity based on predetermined matching criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only infrared imaging is used for vein pattern recognition, then the system structure remains simple, but the system cannot reliably distinguish between real and fake vein patterns
Solution Approach 1:
The patent combines infrared imaging and visible light imaging into a single sensor system. The imaging sensor includes both infrared-sensitive pixels and visible light-sensitive pixels, allowing the system to capture both types of images simultaneously or sequentially and compare them to detect fakes. This merging approach maintains reliability improvement while controlling device complexity through integration.
Solution Approach 2:
The imaging sensor is designed with multi-functionality, capable of detecting both infrared radiation and visible light. This universal sensor can perform both traditional infrared vein pattern recognition and the new fake detection function by comparing infrared and visible light images, eliminating the need for separate dedicated sensors for each function.
2Measurement precision
If dual-wavelength imaging is implemented to detect fakes, then recognition accuracy improves, but the device complexity increases
Solution Approach 1:
The patent merges infrared and visible light detection capabilities into a single imaging sensor rather than using separate camera chips. This integrated approach reduces device complexity while maintaining the measurement precision needed for accurate fake detection through multi-wavelength imaging.
Solution Approach 2:
The imaging sensor is designed as a universal device that can detect multiple wavelengths (infrared and visible light) simultaneously. This multi-functional sensor reduces the need for multiple specialized components, thereby lowering device complexity while achieving high measurement precision for fake detection.
3Reliability
If multiple light sources with different wavelengths are used, then the ability to detect fakes improves, but the energy consumption increases
Solution Approach 1:
The patent employs periodic action by alternately activating infrared and visible light light sources rather than keeping them continuously on. The controller switches between different wavelength illuminations in sequence, capturing images at different times. This periodic activation maintains the ability to detect fakes through comparison while significantly reducing overall energy consumption compared to continuous operation of all light sources.
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
Effectively enhances the security of access controls by accurately differentiating between real and fake vein patterns, improving recognition accuracy and preventing unauthorized access.
Implementation Method 1
The first light source is configured to illuminate the detection range of the camera across the entire surface and to emit during operation electromagnetic waves with wavelengths in the near infrared range which are absorbed by hemoglobin
Implementation Method 2
The camera comprises a first and a second camera chip or a single first, combined camera chip, of which the first camera chip is configured to record reflected electromagnetic waves with wavelengths in the near infrared range and to convert them into a corresponding infrared image
Data Source
AI summary
The invention relates to a sensor system for checking a vein pattern. The sensor system comprises a first light source that is configured to emit during operation across the entire surface electromagnetic waves with wavelengths in the near infrared range, which are absorbed by hemoglobin. Furthermore, the sensor system comprises a second light source that is configured to emit during operation across the entire surface electromagnetic waves with wavelengths in the range of visible light. Furthermore, the sensor system comprises a camera with a first camera chip that is configured to record reflected electromagnetic waves with wavelengths in the near infrared range and to convert them into a corresponding infrared image, and with a second camera chip that is configured to record reflected electromagnetic waves with wavelengths in the range of visible light and to convert them into a corresponding photographic image. Finally, the sensor system comprises a first processor unit which is connected to the first camera chip and the second camera chip and which is configured to compare the photographic image with the infrared image, to determine the degree of matching between the photographic image and the infrared image and to classify the vein pattern as real if the degree of matching is less than a predetermined degree of matching, and to classify the vein pattern as not real if the degree of matching is greater than or equal to the predetermined degree of matching.