Biometric Authentication Device Orientation Alignment
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Solution Overview
Problem
Biometric authentication systems face challenges in maintaining accuracy and reducing processing time when the direction of biometric information at registration differs from the direction at matching, especially in non-contact sensors and small devices like notebook personal computers, where space for rotation mechanisms is limited and accurate determination of palm direction is difficult.
Innovation Solution
The biometric authentication apparatus generates a position determination image to estimate the direction of biometric information relative to the sensor, using a processing unit to detect the user's position and determine the necessary rotation angle for alignment, thereby reducing the rotation angle range and improving matching accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the sensor is fixedly installed at the end of the apparatus, then the device complexity is reduced, but the authentication accuracy deteriorates due to angular difference between body part direction and sensor direction
Solution Approach 1:
The system performs preliminary detection of the user's position and body part direction before authentication. By detecting the angular difference between the body part direction and sensor direction in advance, the system can determine whether to proceed with authentication or request the user to adjust their posture, thereby maintaining high authentication accuracy with a fixed sensor installation
Solution Approach 2:
The system provides feedback to the user about their position and posture relative to the sensor. By displaying the detected body part direction and comparing it with the optimal direction, the system guides the user to adjust their posture, ensuring that the angular difference remains within the allowable range for accurate authentication
2Ease of operation
If the allowable angular range is widened to accommodate users at different positions, then the ease of operation is improved, but the false acceptance rate increases
Solution Approach 1:
The system performs preliminary detection of the user's position and body part direction before authentication. By detecting the angular difference between the body part direction and sensor direction in advance, the system can determine whether to proceed with authentication or request the user to adjust their posture, thereby maintaining high authentication accuracy with a fixed sensor installation
Solution Approach 2:
The system provides feedback to the user about their position and posture relative to the sensor. By displaying the detected body part direction and comparing it with the optimal direction, the system guides the user to adjust their posture, ensuring that the angular difference remains within the allowable range for accurate authentication
3Measurement precision
If rotational scanning is performed to align biometric information directions, then the authentication accuracy is improved, but the processing time increases
Solution Approach 1:
The system performs preliminary detection of the user's position and body part direction before authentication. By detecting the angular difference between the body part direction and sensor direction in advance, the system can determine whether to proceed with authentication or request the user to adjust their posture, thereby maintaining high authentication accuracy with a fixed sensor installation
Solution Approach 2:
The system provides feedback to the user about their position and posture relative to the sensor. By displaying the detected body part direction and comparing it with the optimal direction, the system guides the user to adjust their posture, ensuring that the angular difference remains within the allowable range for accurate authentication
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A biometric authentication apparatus includes a biometric information acquiring unit which captures an image of a first body part of a user carrying biometric information to generate a biometric image representing the biometric information, a storage unit which stores a reference table representing a relationship between the user's position relative to a predetermined reference position, a rotation angle of the biometric information and a template for registered biometric information of each registered user, and a processing unit. The processing unit determines a position of a second body part of the user different from the first body part on a position detection image in which an image of the second body part is captured to determine the user's position relative to the predetermined reference position, determines the rotation angle corresponding to the user's position with reference to the reference table, rotates the registered biometric information or the biometric information on the biometric image according to the rotation angle so as to make the direction of the registered biometric information substantially parallel to the direction of the biometric information on the biometric image, and compares the registered biometric information and the biometric information to each other, the direction of the registered biometric information and the direction of the biometric information having been made substantially parallel to each other.