Palm Vein Authentication Using Finger Position Reference
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Solution Overview
Problem
Vein authentication methods face challenges in speed and accuracy due to the instability of palm position during partial authentication, leading to increased False Rejection Rate (FRR) and longer processing times, as they lack reference points like fingerprint whorls for determining the position of the captured vein pattern relative to the entire palm.
Innovation Solution
A terminal apparatus equipped with an information input device to detect coordinate values and a biometric sensor that captures palm vein patterns, allowing for partial matching by correlating input operation positions with registered data, thereby stabilizing the capture area and improving authentication speed and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the terminal apparatus is held by one hand to capture the palm of the other hand from a position slightly separated, then the entire palm can be captured, but the position of the captured palm region becomes unstable and the authentication failing rate increases
Solution Approach 1:
The patent introduces an intermediary reference point system using finger position detection on the terminal apparatus surface. This intermediary mechanism mediates between the unstable hand-held capture position and the need for stable authentication, by detecting which finger is touching the terminal and using that position to identify and extract the corresponding palm region from the captured image, thereby stabilizing the authentication process despite position variations
2Reliability
If the hand holding the terminal apparatus is captured, then the position of the captured palm region stabilizes, but the distance between the palm and terminal apparatus becomes short, making it difficult to capture the entire palm
Solution Approach 1:
The patent applies segmentation by dividing the palm authentication process into distinct regions based on finger position. Instead of requiring the entire palm to be captured in one stable view, the system segments the palm into multiple regions corresponding to different finger positions on the terminal apparatus, allowing partial palm captures to be processed independently and combined for authentication
3Adaptability or versatility
If partial authentication is performed by scanning the vein pattern of the entire palm to find matching positions, then authentication can be performed with partial palm capture, but the processing time increases significantly
Solution Approach 1:
The patent implements preliminary action by pre-establishing the correspondence relationship between terminal apparatus surface positions and palm regions during the registration phase. This preliminary mapping allows the authentication phase to directly extract and compare corresponding palm regions without performing time-consuming scans to find matching positions, significantly reducing processing time while maintaining partial authentication capability
Data Source
AI summary
A terminal apparatus includes an information input device that detects a coordinate value of an input operation position touched by a user, a biometric sensor that captures a capture area of a palm of the user at a time of an input operation to the information input device, to generate biometric data, and a processor. The processor performs a process including matching the biometric data to a corresponding portion of registered biometric data registered in advance and read based on the coordinate value, to compute a similarity of the biometric data to the corresponding portion.