Hand Imaging Range Adjustment for Blur-Free Finger Capture
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Solution Overview
Problem
Fingerprint reading apparatuses that capture moving fingertips can result in blurred images due to the fixed camera positions, leading to potential image blurring.
Innovation Solution
A photographing system and method that includes a guiding unit to display a guiding image along a predetermined trajectory, a photographing unit to adjust its range accordingly, and a photographing range adjustment unit to synchronize the image capture with the guiding image, ensuring clear hand images by minimizing hand movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed cameras are used to capture moving fingertips, then the device structure is simple, but the photographed image becomes blurred
Solution Approach 1:
The patent applies the dynamics principle by making the photographing range adjustable and movable to track the guiding image position. The photographing range adjustment unit dynamically changes the capture area to follow the moving guiding image along the trajectory, transforming a static fixed-camera system into a dynamic tracking system that maintains image clarity while accommodating hand movement
Solution Approach 2:
The patent implements feedback by using the guiding image position as a reference to control the photographing range adjustment. The system continuously monitors the guiding image position and adjusts the photographing range accordingly, creating a closed-loop control system that ensures the hand remains within the optimal photographing range, thereby preventing image blurring
2Manufacturing precision
If the photographing range is adjusted to follow hand movement, then image clarity is maintained, but the device complexity increases
Solution Approach 1:
The patent uses the guiding image as an intermediary element that mediates between the hand movement and the photographing range adjustment. The guiding image serves as a visual reference that simplifies the control process, allowing the system to adjust the photographing range without requiring complex direct tracking mechanisms, thus maintaining photographing precision while limiting device complexity
Solution Approach 2:
The patent replaces complex mechanical tracking systems with a simpler control approach where the photographing range adjustment unit responds to guiding image position changes. Instead of using elaborate mechanical devices to physically track and follow hand movement, the system uses controlled adjustment of the photographing range based on guiding image coordinates, reducing mechanical complexity while maintaining precision
Data Source
AI summary
A photographing system (101) according to an aspect of the present disclosure includes a photographing means (11), a guiding means (12), and a photographing range adjustment means (13). The photographing means (11) photographs a hand of a user. The guiding means (12) displays a guiding image serving as a mark for the user for guiding a position of his/her hand. Further, the guiding means (12) moves a position at which the guiding image is displayed. The photographing range adjustment means (13) adjusts a photographing range of the photographing means (11) to a range corresponding to the position at which the guiding image is displayed.