Biometric Image Capture Stabilization via Contact Position Detection
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Solution Overview
Problem
Biometric authentication accuracy is reduced due to fluctuations in the state of input, such as hand position and orientation, during biometric information input.
Innovation Solution
An image capture device with a processor that detects the location of a subject's fingertip on a surface and adjusts the image sensor to capture images when the distance between the fingertip and the sensor meets specific criteria, ensuring the palm is positioned optimally within the sensor's field of view, thereby stabilizing the inclination and height of the palm for consistent image capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If biometric authentication is performed without controlling subject position, then the operation is simple, but authentication accuracy is reduced due to fluctuations in hand position and orientation
Solution Approach 1:
The system performs preliminary detection of the subject's position and orientation before the actual biometric authentication. The processor detects the location where the subject contacts the surface and calculates the distance between this location and the image sensor, determining whether the subject is in the appropriate position for authentication before capturing the biometric data.
Solution Approach 2:
The system provides feedback to the subject about their position relative to the optimal authentication position. By detecting the contact location and calculating distances, the system can determine whether the subject needs to adjust their hand position or orientation to achieve proper alignment with the image sensor for accurate authentication.
2Reliability
If the image sensor captures images at various distances, then the device is versatile, but the reproducibility of biometric information input is reduced
Solution Approach 1:
The system dynamically adjusts the authentication process based on the detected subject position. Rather than using a fixed capture distance, the processor calculates the actual distance between the contact location and the image sensor, and uses this information to determine whether to proceed with authentication or request position adjustment, allowing the system to adapt to varying subject positions while maintaining reproducibility.
Solution Approach 2:
The system changes the operational parameters of authentication based on detected position. By measuring the distance between the contact location and image sensor, the system can determine whether the subject is within the appropriate distance range for authentication, and adjust the authentication process accordingly to ensure consistent and reproducible biometric input quality.
3Measurement precision
If the system detects and verifies subject position before authentication, then authentication accuracy is improved, but processing time is increased
Solution Approach 1:
The position detection and verification is performed as a preliminary step before the actual biometric authentication. The processor quickly detects the contact location and calculates the distance to determine if the subject is in the correct position, allowing for rapid position verification without significantly increasing overall processing time.
Solution Approach 2:
The system can skip the detailed authentication process if the subject position is not appropriate, quickly determining that authentication should not proceed. This allows the system to rapidly reject improperly positioned subjects without performing full authentication, reducing time loss for incorrect positions while maintaining accuracy for correct positions.
Data Source
AI summary
An image capture device includes a casing, an image sensor provided to a surface of the casing, and a processor configured to: detect a location with which a subject is in contact on the surface, and cause the image sensor to perform image capture processing when a distance between a first portion of the subject and the image sensor meets a certain criterion, the first portion being different from a second portion of the subject, the second portion being in contact with the surface in the location, wherein the certain criterion is set based on first distance information indicating a first distance between the location and the image sensor and second distance information indicating a second distance between a certain location on the surface and the image sensor.