Swipe Sensor Continuous Data Streaming
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Solution Overview
Problem
Existing swipe sensor technologies face challenges in capturing continuous biometric data due to sequential sampling, which introduces image skew and requires post-processing to reconstruct images from discrete slices, limiting their ability to freeze data at a single instant and resulting in inefficiencies.
Innovation Solution
The method involves scanning a digit relative to an array of sensor elements, detecting and outputting continuous streams of biometric data, and discrete sampling these streams in parallel, allowing for direct reconstruction of biometric images without the need for stitching together image slices, using a motion sensor to adjust sampling based on scanning speed and movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sequential sampling of sensor elements is used, then device complexity is reduced, but image skew is introduced and measurement precision deteriorates
Solution Approach 1:
The sensor array is divided into multiple independent sensor rows, each capable of simultaneous sampling. This segmentation allows parallel data acquisition across rows while maintaining simple sequential sampling within each row, thereby reducing image skew without significantly increasing overall device complexity.
Solution Approach 2:
The patent transitions from single-row sequential sampling to multi-row parallel sampling, adding a spatial dimension (row index) to the sampling process. This dimensional expansion enables simultaneous capture of multiple sensor lines, freezing motion artifacts while keeping individual sensor element complexity low.
2Productivity
If discrete image slices are captured and stitched together, then productivity is improved through parallel processing, but loss of time increases due to post-processing reconstruction
Solution Approach 1:
The patent performs preliminary spatial organization of data during the sampling phase by assigning each sensor element's data to its corresponding row and column position. This preliminary structuring eliminates the need for complex post-processing stitching operations, reducing reconstruction time while maintaining high parallel data capture productivity.
Solution Approach 2:
The patent extracts and eliminates the time-consuming image stitching operation from the processing pipeline by directly capturing complete image data in a single sweep across all sensor rows. This removal of the stitching step reduces post-processing time while preserving the parallel sampling capability.
3Device complexity
If fixed time interval sampling is used, then device complexity is reduced, but measurement precision deteriorates due to finger movement between slices
Solution Approach 1:
The patent implements dynamic sampling where the timing and triggering of data acquisition are adapted based on detected finger motion characteristics. The system can adjust sampling parameters in real-time to optimize capture quality, improving measurement precision while maintaining relatively simple control logic through motion-based triggering.
Data Source
AI summary
Methods and apparatus for processing biometric digit data variously include scanning a digit in a transverse direction relative to an array of sensor elements, detecting the scanned digit and/or a predetermined characteristic of the scanned digit, outputting from individual sensor elements of the array of sensor elements respective continuous streams of biometric data associated with the scanned digit, discrete sampling the respective continuous streams of data, and reconstructing the discrete sampled data. The discrete sampled data may be directly reconstructed, e.g., in accordance with a reconstruction characteristic associated with detecting and/or discrete sampling the scanned digit, to form a biometric characteristic image associated with the digit. Optionally, the respective continuous streams of data may be stored for later discrete sampling, or discrete sampled data may be stored for later reconstruction to form a biometric characteristic image associated with the digit.