Facial Thermal Mapping for Biometric Spoof Detection
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Solution Overview
Problem
Existing biometric determination systems struggle to accurately differentiate between living bodies and spoofing attempts using temperature-based methods, particularly when faced with objects like masks or eyeglasses that can mimic body heat.
Innovation Solution
A biometric determination system that utilizes a face detection unit to locate a face in an image, a temperature acquisition unit to measure temperatures at multiple points on the face using infrared imaging, and a biometric determination unit to assess whether the face belongs to a living body based on these temperature readings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature-based biometric determination is used, then authentication can be performed, but accuracy deteriorates when faced with spoofing attempts using masks or eyeglasses that mimic body heat
Solution Approach 1:
The patent divides the face into multiple detection regions (forehead, cheeks, nose, chin) and obtains temperatures at multiple points within each region. This segmentation allows the system to detect temperature distributions across the face rather than relying on a single temperature reading, making it more difficult for spoofing objects to mimic natural human temperature patterns.
Solution Approach 2:
The patent applies different detection strategies to different regions of the face based on their specific characteristics. For example, the forehead region is detected with one method while cheek and nose regions use other methods. This local quality approach allows the system to account for natural temperature variations across different facial areas and better distinguish living bodies from spoofing attempts.
2Measurement precision
If multiple temperature points are measured, then spoofing detection accuracy improves, but device complexity increases
Solution Approach 1:
The patent uses a single infrared imaging device to perform multiple functions: obtaining temperature data at multiple points, detecting facial regions, and analyzing temperature distributions. This multi-functional approach avoids the need for multiple separate temperature sensors while still achieving high measurement precision through comprehensive spatial temperature mapping.
3Measurement precision
If temperature data from multiple points is collected, then differentiation between living bodies and spoofing improves, but processing time increases
Solution Approach 1:
The patent performs preliminary facial region detection and temperature point identification before the actual biometric determination. By pre-segmenting the face into relevant regions and pre-identifying temperature measurement points, the system can efficiently collect and process temperature data without significant time delay, maintaining both precision and speed.
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 system enhances the accuracy of biometric determination by considering multiple temperature points, allowing for precise differentiation between living bodies and spoofing attempts, and can also identify the presence of wearing items like masks or eyeglasses.
Implementation Method 1
a temperature acquisition unit 120 that obtains temperatures at a plurality of points of the face
Data Source
AI summary
A biometric determination system includes: a face detection unit that detects a position of a face from an image including the face; a temperature acquisition unit that obtains temperatures at a plurality of points of the face; and a biometric determination unit that determines whether or not the face belongs to a living body on the basis of the temperatures at the plurality of points. According to such a biometric determination system, it is possible to properly detect whether or not the face included in the image belongs to a living body.