Palm Vein Authentication Device Adaptive Imaging Rate
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Solution Overview
Problem
Palm vein authentication systems face challenges in maintaining high authentication accuracy due to changes in posture and limited memory capacity, which restricts the number of images that can be efficiently acquired for comparison.
Innovation Solution
A biometric authentication device and method that adjusts the interval time between acquiring authentication image sets based on the type of sensor used, ensuring consistent imaging rates and reducing the influence of external light and hand movement, thereby allowing for efficient acquisition of images necessary for verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the imaging rate is increased to capture more palm images, then the number of images obtained increases, but the memory capacity is exceeded and only images with small posture changes can be stored
Solution Approach 1:
The patent applies preliminary action by determining the imaging rate before actually capturing images. The system calculates the appropriate imaging rate based on available memory capacity and the rate of posture change, then sets this rate before image acquisition begins. This ensures that the maximum number of useful images (those with sufficient posture variation) can be captured within the memory constraints, rather than capturing images at a fixed high rate that would exceed memory capacity.
2Measurement precision
If multiple palm images are taken to maintain high authentication accuracy with posture changes, then authentication accuracy is improved, but the time required for image acquisition increases
Solution Approach 1:
The patent applies dynamics by making the imaging rate adjustable rather than fixed. The system dynamically determines the optimal imaging rate based on the subject's posture change speed and memory capacity, then captures images at this adaptive rate. This allows the system to capture sufficient images for accurate authentication when posture changes are slow, while reducing the number of images needed when posture changes rapidly, thereby minimizing acquisition time while maintaining authentication accuracy.
3Quantity of substance
If images are acquired with limited memory capacity, then storage efficiency is improved, but the number of images available for comparison is reduced
Solution Approach 1:
The patent applies parameter changes by adjusting the imaging rate parameter based on memory capacity and posture change characteristics. Instead of using a fixed imaging rate, the system calculates and sets an optimized rate that maximizes the number of images with sufficient posture variation that can be stored in the available memory. This ensures that the limited memory capacity is utilized efficiently to store the maximum number of useful images for accurate authentication comparison.
Data Source
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AI summary
A biometric authentication device includes: an imaging device configured to acquire a plurality of sets of palm images taken under different illumination conditions of an illumination source from one another in obtaining images of a palm with light emitted from the illumination source; an adjusting unit configured to adjust a time interval at which the imaging device acquires the image sets, in accordance with a condition for imaging the palm; an extracting unit configured to extract a biological feature from each of the image sets; and a comparing unit configured to compare each biological feature extracted by the extracting unit with a biological feature registered in advance.