Palm Vein Authentication via Multi-Position Touch Guidance
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Solution Overview
Problem
Biometric authentication using partial palm images in mobile terminals suffers from reduced authentication precision due to variations in user posture, leading to increased false acceptance rates.
Innovation Solution
A method involving a communication device with a touch panel that captures multiple images of different palm portions by guiding the user to perform specific manipulations, such as drawing shapes, to ensure a wide range of the palm is photographed, thereby stabilizing the posture and enhancing feature extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the user brings a particular finger into contact with the touch panel to control posture, then the posture becomes substantially the same, but the distance between the camera and the palm is shortened so only part of the palm is included in the image
Solution Approach 1:
The patent transitions from two-dimensional palm print recognition to three-dimensional vein pattern recognition by capturing images at multiple contact positions. The determining unit analyzes vein patterns in the depth direction (third dimension) to authenticate the user, thereby solving the problem of limited palm area coverage while maintaining consistent posture through finger contact guidance
2Length of stationary object
If only part of the palm is captured in the image, then the distance between the camera and the palm is reduced, but the features that can be extracted are lessened when compared with features extracted from a wide range
Solution Approach 1:
The patent captures multiple images of the palm at different contact positions and creates a composite or aggregated representation of the vein patterns. By combining information from multiple partial images, the system recovers comprehensive biometric features that would otherwise be lost, effectively copying and synthesizing the complete palm vein structure from fragmented views
3Ease of operation
If biometric information is created from an image of part of the palm, then the authentication precision is lowered when compared with a case in which biometric information is created from the whole of the palm, but the operation becomes simpler
Solution Approach 1:
The determining unit evaluates whether the captured palm images contain sufficient vein pattern information for reliable authentication. Based on this evaluation feedback, the system either proceeds with authentication using the captured images or requests the user to recapture images, thereby ensuring authentication precision is maintained while keeping the process simple and automated
Data Source
Figure 1A~1D
Figure 2
Figure 3A~3D
AI summary
A method includes acquiring, from a manipulation unit, a contact position of a manipulating body and contact information that indicates a degree to which the manipulating body is in contact at the contact position, acquiring, from photographing unit, a plurality of images captured while the manipulating body is in contact with a plurality of mutually different positions on the manipulation unit due to manipulations with the manipulating body, creating variation information that indicates a variation in contact information, according to a plurality of contact information corresponding to the plurality of contact positions, and deciding, according to the variation information, suitability of the plurality of images in the biometric authentication to be executed using the plurality of images.