Optical Fingerprint Sensor Image Superimposing Circuit
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Solution Overview
Problem
Optical fingerprint sensing technologies face challenges in achieving high matching success rates, especially in unfavorable environments like low-temperature or bright-light conditions, due to poor image quality and instability of fingerprint images during the sensing process.
Innovation Solution
An optical fingerprint sensing device and method that captures multiple images of a fingerprint and uses an image superimposing circuit to combine them based on specific parameters, enhancing the quality of the fingerprint image for improved matching by the fingerprint matching circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple fingerprint images are captured and superimposed to improve image quality, then matching success rate is improved, but sensing time is increased
Solution Approach 1:
The system performs preliminary actions by capturing multiple fingerprint images in advance and superimposing them to create a high-quality reference fingerprint image before the actual matching process. This preliminary image enhancement ensures that subsequent matching operations have optimal input quality, improving success rates while the system can operate efficiently during actual authentication.
2Reliability
If failure-to-recapture comparing mechanism is used to reduce false rejection rate, then matching accuracy is improved, but user experience is degraded due to repeated sensing requirements
Solution Approach 1:
The system performs preliminary image enhancement by capturing and superimposing multiple fingerprint images before the actual matching process. This creates a high-quality reference image that significantly reduces false rejections, eliminating the need for users to repeatedly sense their fingerprints and improving overall user experience while maintaining high matching accuracy.
3Device complexity
If conventional optical sensing is used in unfavorable environments (low-temperature, dry-finger, bright-light), then device simplicity is maintained, but image quality deteriorates leading to recognition failure
Solution Approach 1:
The system performs preliminary image enhancement by capturing multiple fingerprint images and superimposing them to create a high-quality reference image before matching. This pre-processing step compensates for poor image quality caused by unfavorable environmental conditions, maintaining recognition accuracy without requiring complex hardware modifications.
Solution Approach 2:
The system merges multiple fingerprint images through superimposition to create a single high-quality reference image. By combining multiple images captured under the same environmental conditions, the system enhances fingerprint features and reduces noise, improving image quality without changing the basic optical sensing mechanism.
Data Source
AI summary
An optical fingerprint sensing device and an operation method thereof are provided. The optical fingerprint sensing device includes an optical fingerprint sensing circuit, an image superimposing circuit and a fingerprint matching circuit. The optical fingerprint sensing circuit is configured to capture an original image of the fingerprint. The image superimposing circuit is coupled to the optical fingerprint sensing circuit. The image superimposing circuit is configured to collect the original image of the fingerprint to obtain a plurality of original fingerprint images. The image superimposing circuit superimposes the original fingerprint images according to at least one superimposition parameter to obtain a superimposed fingerprint image. The fingerprint matching circuit is coupled to the image superimposing circuit to receive the superimposed fingerprint image. The fingerprint matching circuit performs fingerprint matching on the superimposed fingerprint image.