Dual-Camera Hand Authentication via Stationary Detection
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Solution Overview
Problem
Existing biological authentication devices are primarily contact-based, which can lead to decreased accuracy due to camera shake and increased hygiene risks from contact with multiple persons and objects, necessitating a non-contact solution for stable biological information acquisition.
Innovation Solution
A dual-camera system where a first camera captures a hand image and detects the stationary state of the hand, allowing a second camera to image the hand for biological authentication, enabling non-contact acquisition and authentication without compromising accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a contact type biological authentication device is used to fix the finger, then authentication accuracy is maintained, but hygiene risks increase due to contact with multiple persons and objects
Solution Approach 1:
The patent introduces a glass surface as an intermediary between the user's finger and the camera. The finger is placed on the glass surface which transmits light, allowing optical capture of biological information without direct contact between the sensor and the user's skin. This mediator enables non-contact authentication while maintaining image quality.
Solution Approach 2:
The patent replaces the mechanical contact-based fixation system with an optical field-based system. Instead of using physical clamps or holders to fix the finger position, the system uses optical fields (light) to capture biological information through the glass surface, eliminating mechanical contact while maintaining authentication accuracy.
2Object-affected harmful factors
If a non-contact type biological authentication device is used, then hygiene risks are reduced, but authentication accuracy decreases due to camera shake
Solution Approach 1:
The glass surface serves as a stable intermediary platform that the finger rests on during non-contact authentication. This provides a reference plane that helps maintain consistent positioning and reduces the impact of hand movements, thereby improving image stability without requiring mechanical contact fixation.
Solution Approach 2:
The system captures a preliminary image to detect whether the hand is in a stationary state before proceeding with authentication image capture. This preliminary detection action ensures that only stable, shake-free images are used for authentication, preventing accuracy degradation from camera shake.
3Measurement precision
If the base side of the finger is brought into contact with the base holding portion for fixation, then authentication accuracy is maintained, but the opportunity for contact with unspecified persons and objects increases
Solution Approach 1:
The glass surface acts as a universal intermediary that replaces the base holding portion for finger support. Users place their fingers on the glass surface rather than contacting the base holding portion, eliminating direct contact with shared components while the glass transmits light for accurate biological information capture.
Solution Approach 2:
The patent replaces the mechanical base holding portion contact system with an optical transmission system through glass. The finger is supported on the glass surface without mechanical fixation, and biological information is captured optically, eliminating the need for mechanical contact while maintaining authentication accuracy.
Data Source
AI summary
This biological information acquisition device comprises: a first camera which captures a first hand image of a user, the hand being inserted into an imaging region; a second camera which captures a second hand image of the user used for biological authentication; and a processor which causes the second camera to capture the second hand image when a stop of the user's hand is detected on the basis of the hand image captured by the first camera.