Biometric Authentication Device Palm Orientation Correction
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Solution Overview
Problem
Conventional biometric authentication systems face challenges in achieving high accuracy and simplicity during enrollment, particularly when the degree of freedom in placing the palm is increased, leading to difficulties in obtaining proper images due to restricted or complex positioning requirements.
Innovation Solution
A biometric authentication device that includes a fingerprint sensor and a vein sensor, with units for determining fingerprint and palm positions, providing feedback to correctly align fingers and the palm, and rotating/moving images to match enrollment references, enhancing the degree of freedom and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the degree of freedom in placing the palm is increased, then the ease of operation is improved, but the difficulty in obtaining proper images increases due to restricted positioning requirements
Solution Approach 1:
The system provides feedback information to the user indicating the current palm placement status and guiding them to achieve proper positioning. The feedback mechanism allows users to adjust their palm placement based on real-time guidance, thereby maintaining ease of operation while ensuring proper image quality is achieved.
2Measurement precision
If multiple types of biometric information are used, then the authentication precision is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple biometric sensing functions (fingerprint sensing and vein pattern sensing) into a single integrated device with a unified sensor assembly. This merging approach maintains high authentication precision by utilizing multiple biometric types while reducing device complexity through shared structural components, control circuits, and housing.
3Measurement precision
If the entire palm is shot for vein pattern, then the measurement precision is improved, but the time required for image acquisition increases
Solution Approach 1:
The system performs preliminary positioning guidance before actual image acquisition, providing feedback to ensure the palm is correctly positioned in advance. This preliminary action prevents the need for repeated imaging attempts, thereby reducing overall acquisition time while ensuring complete palm coverage for accurate vein pattern recognition.
Data Source
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AI summary
A fingerprint image obtaining unit (1) obtains a fingerprint image of multiple fingers. A vein image obtaining unit (3) obtains a palm vein image. An authentication information DB (6) stores reference vein characteristic information, and a reference direction of a predetermined finger in a reference palm vein image for which the reference vein characteristic information is obtained. A reference obtaining unit (20) detects a longitudinal direction of a predetermined finger based on the fingerprint image obtained by the fingerprint image obtaining unit (1). A position correcting unit (40) corrects the palm vein image obtained by the vein image obtaining unit (3) based on the longitudinal direction of the predetermined finger detected by the reference obtaining unit (20), and the reference direction of the predetermined finger. A vein characteristic information extracting unit (4) obtains vein characteristic information from a corrected palm vein image. A verification processing unit (32) matches the vein characteristic information obtained by the vein characteristic information extracting unit (4) with the reference vein characteristic information for authentication.