Biometric Authentication Device Using Partial Image Segmentation
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Solution Overview
Problem
Existing biometric authentication technologies for portable devices face challenges in achieving high authentication accuracy while minimizing processor load, due to limited hardware resources and the need for efficient processing times.
Innovation Solution
A biometric authentication device that generates partial images of biometric information, calculates correlation values, and updates similarity based on relative positional relationships between partial images, allowing for authentication when the similarity meets a threshold, thereby reducing operational load and enhancing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the entire biometric image is processed for authentication, then authentication accuracy is improved, but processor load increases and processing time extends
Solution Approach 1:
The patent divides the biometric image into multiple partial images and processes them sequentially. The authentication process stops when a predetermined number of partial images are successfully matched, avoiding the need to process the entire image. This segmentation approach maintains sufficient authentication accuracy while significantly reducing processor load and processing time.
Solution Approach 2:
The patent applies partial action by processing only a predetermined number of partial images rather than the entire biometric image. The authentication determination is made based on the matched partial images, which is sufficient for accurate authentication without requiring complete image processing, thus balancing accuracy with processing efficiency.
2Reliability
If more partial images are processed to improve authentication reliability, then authentication accuracy is improved, but processing time increases
Solution Approach 1:
The patent performs preliminary actions by pre-dividing the biometric image into multiple partial images and establishing a predetermined number of images to be processed. This preparation allows the authentication process to stop early when sufficient matches are found, reducing actual authentication time while maintaining reliability through the predetermined sampling approach.
Solution Approach 2:
The patent implements feedback mechanisms where the authentication determination is continuously updated based on the matching results of partial images. When the determination reaches a sufficient confidence level based on matched partial images, the process stops. This feedback-driven approach ensures reliable authentication while minimizing processing time by avoiding unnecessary additional processing.
Data Source
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AI summary
A biometric authentication device including: a biometric information acquiring unit which generates a plurality of partial images, each of the partial images capturing a portion of biometric information of a user different from each other; a storage unit which stores data concerning registered biometric information of a registered user; a correlation value calculation unit which calculates the correlation value between a portion of biometric information represented on one partial image and the registered biometric information; a partial similarity update unit which, based on the correlation value for the one partial image and the correlation value for at least one other partial image acquired before the one partial image, updates partial similarity representing the degree of similarity between the registered biometric information and portions of biometric information represented on the one partial image and the at least one other partial image; an authentication unit which authenticates, when the partial similarity is equal to or higher than an authentication judging threshold, the user as the registered user; and an image loading unit which loads the next partial image of the one partial image from the biometric information acquiring unit when the partial similarity is lower than an authentication judging threshold.