Fingerprint Identification Using Common Camera Lens Focus
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Solution Overview
Problem
Existing fingerprint identification technologies are costly and complex, lacking efficient methods for image acquisition and processing using common, affordable cameras.
Innovation Solution
A method and system utilizing a common camera to focus on a lens, capture fingerprint images, and process them using an image processing module, which includes adjusting the camera to focus, capturing images, and processing them to acquire fingerprints, potentially with an anti-fingerprint film for clear imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical fingerprint module is used, then fingerprint identification function is achieved, but structure becomes complicated
Solution Approach 1:
The camera lens is designed to serve dual purposes: general photography and fingerprint capture. By making the lens capable of focusing on both distant objects and close-up fingerprint patterns, the system eliminates the need for a separate fingerprint imaging device, thereby simplifying the overall structure while maintaining identification functionality
Solution Approach 2:
The invention uses a standard camera system to capture optical patterns from the fingerprint, creating a digital copy of the fingerprint's ridge and valley structures. This digital replica can then be processed and stored for identification purposes, replacing the need for specialized fingerprint sensing hardware
2Reliability
If semiconductor fingerprint module is used, then fingerprint identification function is achieved, but price increases and design limitations increase
Solution Approach 1:
The invention employs standard, mass-produced camera lenses and image sensors that are significantly cheaper than specialized semiconductor fingerprint modules. These conventional imaging components can be easily replaced or upgraded, providing cost-effective fingerprint identification without the high manufacturing costs and design constraints of dedicated fingerprint sensors
Solution Approach 2:
The system changes the operating parameters of a standard camera by adjusting focus distance and lighting conditions to optimize for fingerprint capture. By modifying these parameters rather than using specialized hardware, the invention achieves fingerprint identification functionality at lower cost with greater design flexibility
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables easy, low-cost fingerprint identification using a common camera, reducing operational complexity and costs by focusing on lens-based imaging and processing.
Implementation Method 1
adjusting a camera to focus the camera on a lens
Implementation Method 2
capturing continuously by the camera fingerprint images formed by a finger pressing the lens
Data Source
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Figure 3~5
AI summary
The invention discloses a method and system for identifying fingerprint. The method comprises: S1: adjusting a camera to focus the camera on a lens; S2: capturing continuously by the camera fingerprint images formed by a finger pressing the lens, and sending the fingerprint images to an image processing module; and S3: processing the fingerprint images by the image processing module so as to acquire fingerprints. In this way, only a common camera is required for acquiring the fingerprint according to the invention, which is easy to operate at a low cost.