Linear Sensor Array Fingerprint Motion Tracking
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Solution Overview
Problem
Conventional fingerprint sensing devices for portable electronics face challenges in efficiently capturing and reconstructing fingerprints with minimal power consumption, as they require extensive processing resources and demand substantial power due to the need for large pixel information processing and navigation functions.
Innovation Solution
A fingerprint motion tracking system using a linear sensor array with contiguous sensing elements that captures overlapping segments of image data, allowing for efficient motion detection and image reconstruction with reduced processing and power requirements by separating motion analysis from image capture and using motion information to reconstruct the fingerprint image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional fingerprint sensing devices use large pixel arrays to capture complete fingerprint images, then image quality and identification accuracy are improved, but power consumption and processing requirements increase substantially
Solution Approach 1:
The fingerprint sensing array is divided into multiple sensing lines arranged in parallel, with each line capturing a specific portion of the fingerprint image. This segmentation allows the system to process smaller data chunks independently, reducing overall power consumption while maintaining complete fingerprint capture capability through sequential scanning of multiple lines.
Solution Approach 2:
Motion detection algorithms analyze the temporal variation of fingerprint feature positions across sequential sensing lines to determine finger movement speed and direction before complete image reconstruction. This preliminary motion analysis enables optimization of subsequent processing steps and reduces overall computational power requirements.
2Measurement precision
If conventional devices capture and store large amounts of pixel information for fingerprint reconstruction, then identification accuracy is improved, but processing time and computational burden increase
Solution Approach 1:
The fingerprint image is divided into multiple horizontal sensing lines, each processed independently to extract motion information and image data. This segmentation enables parallel processing of multiple image portions simultaneously, reducing total processing time while maintaining complete fingerprint data for accurate identification.
Solution Approach 2:
Motion detection is performed preliminarily on each sensing line's data before final image reconstruction, allowing the system to optimize processing based on detected motion characteristics. This preliminary analysis enables adaptive processing strategies that reduce overall computational burden.
3Measurement precision
If devices use extensive processing algorithms for motion detection and image reconstruction, then navigation accuracy and fingerprint reconstruction quality are improved, but power consumption increases
Solution Approach 1:
Motion detection is segmented into line-by-line analysis of individual sensing rows rather than processing the entire fingerprint image simultaneously. This segmentation reduces the computational complexity of motion algorithms while maintaining accurate motion detection capability, thereby reducing processor power consumption.
Solution Approach 2:
Simple motion detection algorithms operate preliminarily on each sensing line's data to determine finger movement characteristics before complete image reconstruction. These preliminary motion analyses use computationally lightweight methods that significantly reduce overall processing power requirements while maintaining sufficient accuracy for navigation functions.
Data Source
AI summary
A fingerprint motion tracking method and system is provided for sensing features of a fingerprint along an axis of finger motion, where a linear sensor array has a plurality of substantially contiguous sensing elements configured to capture substantially contiguous overlapping segments of image data. A processing element is configured to receive segments of image data captured by the linear sensor array and to generate fingerprint motion data. Multiple sensor arrays may be included for generating directional data. The motion tracking data may be used in conjunction with a fingerprint image sensor to reconstruct a fingerprint image using the motion data either alone or together with the directional data.