Fingerprint Recognition Image Correction via Foreign Material Subtraction
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Solution Overview
Problem
Fingerprint recognition accuracy is compromised by foreign materials on the fingerprint sensor, leading to increased false matches and decreased user efficiency in electronic devices.
Innovation Solution
A method for fingerprint recognition that collects an original fingerprint image and a foreign material image, with the foreign material image obtained when the user's finger is not present, allowing for the correction of the fingerprint image by removing overlapping foreign material regions, and comparing the corrected image with a pre-stored fingerprint image to determine a match.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fingerprint recognition is performed using original fingerprint images collected from the sensor, then the recognition process is simple and fast, but foreign materials on the sensor cause false matches and reduce accuracy
Solution Approach 1:
The system performs preliminary action by collecting a foreign material image before fingerprint recognition and storing it for later use. This pre-captured image is then subtracted from subsequent fingerprint images to remove foreign material interference, thereby improving recognition accuracy without adding complex real-time processing during authentication
Solution Approach 2:
The invention extracts the foreign material component from the fingerprint image by subtracting the pre-captured foreign material image from the original fingerprint image. This extraction process isolates and removes the harmful foreign material elements, leaving only the genuine fingerprint patterns for accurate recognition
2Measurement precision
If foreign material images are collected and used to correct fingerprint images, then recognition accuracy improves, but the processing time and computational resources increase
Solution Approach 1:
The foreign material image is captured and stored in advance during device initialization or screen assembly, rather than during each fingerprint recognition event. This preliminary capture eliminates the need for real-time foreign material detection, reducing processing time during actual authentication while maintaining high accuracy through subsequent image subtraction
3Ease of operation
If the fingerprint collecting region is made larger to improve user convenience, then ease of operation improves, but the impact of foreign materials on recognition accuracy increases
Solution Approach 1:
By subtracting the foreign material image from the fingerprint image, the invention removes the harmful influence of foreign materials regardless of the collecting region size. This allows the fingerprint collecting region to be enlarged for user convenience while maintaining recognition accuracy, as the foreign material subtraction process eliminates interference from any area of the sensor surface
Data Source
AI summary
Provided are a method for fingerprint recognition, an electronic device, and a non-transitory computer-readable storage medium. The method is applicable to the electronic device. The method includes the following. An image of a user's finger placed on a fingerprint collecting region of a display screen of the electronic device is collected as an original fingerprint image. A corrected fingerprint image is obtained according to the original fingerprint image and a predetermined foreign material image, where the predetermined foreign material image is obtained when the user's finger is not placed on the fingerprint collecting region and indicative of a foreign material on the fingerprint collecting region. Determine whether a match between the corrected fingerprint image and a pre-stored fingerprint image exists by comparing the corrected fingerprint image with the pre-stored fingerprint image. The electronic device is triggered to perform a preset action in response to that the match exists.