Fingerprint Verification Device Dual Resolution Capture
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Solution Overview
Problem
Fingerprint verification systems in hardware-constrained devices, such as smart cards, face challenges with high resolution requirements for accurate authentication, which lead to increased processing times and resource consumption, while lowering resolution results in higher false acceptance and rejection rates.
Innovation Solution
A fingerprint verification device operating in both high and low resolution modes, capturing fingerprint images in low resolution initially and selectively recapturing high-resolution areas of interest, allowing for efficient processing and reduced resource usage while maintaining authentication accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high resolution mode is used for fingerprint capture, then authentication accuracy is improved, but processing time and resource consumption increase
Solution Approach 1:
The patent divides the fingerprint verification process into two stages: initial verification using low resolution mode for the entire fingerprint image, and selective high resolution recapture only for specific areas of interest (such as ridge endings and bifurcations). This segmentation allows the system to achieve high authentication accuracy for critical features while minimizing overall processing time and resource consumption.
Solution Approach 2:
The patent applies different resolution qualities to different parts of the fingerprint image. Instead of uniformly using high resolution across the entire image, the system captures the full fingerprint at low resolution and then selectively recovers high resolution data only for locally important areas identified during initial processing. This local quality approach optimizes the balance between accuracy and efficiency.
2Measurement precision
If high resolution mode is used for fingerprint capture, then authentication accuracy is improved, but resource consumption increases
Solution Approach 1:
The patent segments the resource-intensive high resolution capture operation to be performed only on selected areas of interest rather than the entire fingerprint image. This reduces the total computational load and power consumption while maintaining authentication accuracy for the critical features that determine verification outcomes.
Solution Approach 2:
The patent applies partial action by using low resolution mode for the complete fingerprint image initially, and then applying high resolution recapture only partially to specific areas where additional detail is necessary for accurate authentication. This avoids the excessive resource consumption of full high resolution capture while maintaining sufficient accuracy.
3Productivity
If low resolution mode is used for fingerprint capture, then processing time and resource consumption are reduced, but false acceptance and rejection rates increase
Solution Approach 1:
The patent segments the verification process to use low resolution mode for initial processing and high resolution mode for critical feature verification. This ensures that productivity benefits from low resolution processing are maintained while reliability is preserved through selective high resolution analysis of important fingerprint characteristics.
Solution Approach 2:
The patent uses the low resolution fingerprint image as an intermediary step that identifies areas of interest, which then trigger targeted high resolution recapture. This intermediary approach allows the system to efficiently filter out non-critical regions while focusing computational resources on features that most impact reliability and reduce false acceptance/rejection rates.
Data Source
AI summary
According to a first aspect of the present disclosure, a fingerprint verification device is provided, comprising a fingerprint image sensor and a processing unit, the fingerprint verification device being configured to operate in a first resolution mode and in a second resolution mode, wherein the first resolution is higher than the second resolution, the fingerprint verification device further being configured to operate in a verification mode in which: the fingerprint image sensor captures a fingerprint image in the second resolution mode and the processing unit processes the captured fingerprint image; the processing unit selects one or more areas of the captured fingerprint image; the fingerprint image sensor recaptures the selected areas in the first resolution mode and the processing unit processes the recaptured selected areas. Furthermore, a corresponding fingerprint verification method is conceived, as well as a corresponding non-transitory machine-readable medium that comprises executable instructions.