Fingerprint Sensor Resolution Adjustment for Verification Reliability
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Solution Overview
Problem
Current electronic devices with in-display fingerprint sensing technology face increased failure rates in fingerprint verification due to differences in image resolution caused by protective films affecting the optical magnification between captured and registered fingerprint images.
Innovation Solution
An electronic device with a fingerprint sensor and processor that adjusts the image resolution of either the captured or registered fingerprint images and re-executes the comparison to ensure successful verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If in-display fingerprint sensing technology is adopted, then the display and fingerprint sensing functions are integrated, but the protective film causes different optical magnification between captured and registered images, leading to image resolution differences and verification failures
Solution Approach 1:
The system dynamically adjusts the image resolution parameter of the captured fingerprint image based on the detected protective film condition. When a protective film is detected, the system modifies the resolution parameter to compensate for the optical magnification difference, ensuring accurate fingerprint matching while maintaining the integrated display and sensing functionality
2Reliability
If the image resolution is adjusted to compensate for protective film effects, then the fingerprint verification success rate improves, but the processing time and computational complexity increase
Solution Approach 1:
The system performs preliminary detection of the protective film condition before the fingerprint verification process. By detecting whether a protective film is present in advance and pre-adjusting the image resolution parameter accordingly, the system avoids unnecessary processing time during the actual verification, thus improving success rate without significantly increasing processing time
Solution Approach 2:
The system implements a feedback mechanism where the protective film detection result is used to dynamically adjust the image resolution parameter. The feedback loop continuously monitors the verification process and adjusts parameters in real-time, optimizing the balance between verification accuracy and processing efficiency
Data Source
AI summary
An electronic device with fingerprint sensing function and a fingerprint comparison method are provided. The electronic device includes a fingerprint sensor and a processor. The fingerprint sensor is configured to obtain a first fingerprint image. The processor is coupled to the fingerprint sensor and configured to execute a fingerprint comparison operation to compare the first fingerprint image with a first registered image. When comparison between the first fingerprint image and the first registered image fails, the processor adjusts an image resolution of one of the first fingerprint image and the first registered image, and re-executes the fingerprint comparison operation to determine whether a current fingerprint sensing passes fingerprint verification.