Segmented Image Acquisition Timing Control for Fingerprint Sensors
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Solution Overview
Problem
Current fingerprint sensors face challenges in accuracy due to timing differences between pixel capture operations for adjacent segments during segmented image acquisition, leading to artifacts at the boundary, which can misalign fingerprint patterns and impact authentication performance.
Innovation Solution
The method involves determining and minimizing timing differences between pixel capture operations for adjacent pixels by selecting an optimal pixel capture sequence, such as progressive or non-progressive sequences, to ensure concurrent capture of image segments with reduced artifacts, using a scoring system to compare and select sequences that minimize summation of timing differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If segmented image acquisition is used to improve capture speed, then image acquisition time is reduced, but timing differences between adjacent segments cause artifacts at boundaries
Solution Approach 1:
The image sensor is divided into multiple segments that can be captured concurrently. Each segment is processed independently and then combined to form the complete image, enabling parallel acquisition and improving overall capture speed while maintaining manageable complexity through modular processing
Solution Approach 2:
The patent implements dynamic timing adjustment where the controller modifies the timing of pixel capture operations based on the specific segment being captured. By adjusting timing parameters dynamically for each segment's capture operation, the system minimizes timing differences between adjacent segments and reduces boundary artifacts while maintaining high acquisition speed
2Reliability
If conventional pixel capture sequences are used, then device complexity is low, but timing differences cause artifacts that reduce authentication accuracy
Solution Approach 1:
The controller receives feedback about the timing differences between pixel capture operations for adjacent segments and uses this information to adjust capture timing. This feedback mechanism enables the system to automatically minimize timing variations and reduce boundary artifacts, improving authentication accuracy without requiring overly complex manual control configurations
Solution Approach 2:
The patent changes timing parameters dynamically based on the segment being captured. By modifying capture timing parameters for different segments and adjusting the pixel capture sequence according to the specific segment's requirements, the system minimizes timing differences and reduces artifacts while maintaining manageable device complexity through automated parameter adjustment
Data Source
AI summary
In a method of segmented image acquisition at a sensor, a plurality of segments of an image are concurrently captured, wherein pixels of each segment of the plurality of segments are captured according to a pixel capture sequence. The pixel capture sequence for at least one segment of the plurality of segments is a non-progressive sequence for controlling a timing difference between pixel capture for proximate pixels of adjacent segments. The image including the plurality of segments is generated.