Multi-Sensor Iris Capture System for High-Resolution Authentication
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Solution Overview
Problem
Current image pick-up systems face challenges in photographing iris patterns at sufficient quality for authentication and verification due to large distances, wide fields of view, and subject movement, as existing devices struggle to achieve high resolution and frame rates simultaneously.
Innovation Solution
The system employs multiple iris image pick-up devices with different focusing points arranged vertically and a second device positioned closer to the first, allowing for overlapping fields of view and synchronized illumination, along with guiding and illumination control to ensure high-resolution image capture and minimize blink-induced errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single image pick-up device is used, then the device complexity is low, but the measurement precision and reliability of iris pattern capture deteriorate due to inability to cover wide field of view and maintain high resolution simultaneously
Solution Approach 1:
The system divides the wide field of view into multiple regions, each captured by a dedicated image pick-up device. The first plurality of devices capture different vertical regions, while the second device captures the central region, allowing high-resolution iris pattern capture across the entire field of view without requiring a single complex device
Solution Approach 2:
The patent arranges image pick-up devices in both vertical and depth dimensions. The first plurality of devices are positioned at different vertical heights with focusing points at a predetermined distance, while the second device is positioned closer in the depth dimension, creating a three-dimensional array that captures the wide field of view with high precision
2Adaptability or versatility
If the field of view is widened to accommodate subject movement, then the adaptability improves, but the measurement precision of iris pattern deteriorates due to reduced resolution
Solution Approach 1:
The wide field of view is segmented into multiple capture zones, with each image pick-up device responsible for a specific region. This allows the system to maintain high resolution within each segment while collectively covering a wide field of view, solving the contradiction between field of view width and resolution
Solution Approach 2:
The patent merges the captured images from multiple image pick-up devices through image synthesis processing. By combining the high-resolution images from different devices and positions, the system achieves both wide field of view coverage and high measurement precision for iris pattern recognition
3Productivity
If the frame rate is increased to capture subject movement, then the speed of capture improves, but the measurement precision deteriorates due to reduced exposure time and light gathering
Solution Approach 1:
The high-frame-rate capture task is segmented across multiple image pick-up devices operating in parallel. Each device captures images at high frame rates for its designated region, and the combined data maintains both high temporal resolution and high measurement precision through coordinated operation
Solution Approach 2:
The patent combines images from multiple devices to achieve high frame rates while maintaining precision. By merging data from multiple sensors that simultaneously capture different regions, the system achieves high temporal resolution without sacrificing the light gathering capability and measurement precision of individual devices
4Adaptability or versatility
If multiple image pick-up devices are used to cover wide field of view, then the adaptability improves, but the device complexity and synchronization requirements increase
Solution Approach 1:
The control device receives images from all image pick-up devices and performs synchronous processing with reference to a common timing signal. This feedback mechanism ensures that despite the complexity of multiple devices, they operate in coordination, with the control device adjusting and synchronizing captures based on real-time data from each device
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables high-resolution, high-frame-rate iris image capture, effectively addressing the challenges of distance, field of view, and subject movement, ensuring reliable authentication and verification.
Implementation Method 1
the wavelength of the near-infrared light applied to the eyes of the subject is in a range between 700 nm and 900 nm
Data Source
AI summary
Iris image pick-up devices have the same field of view and are disposed at mutually different positions. An overall image pick-up device performs image pick-up over a wide field of view. A guiding device guides a subject. An illumination device illuminates the subject with light. The controller controls, using an image from the overall image pick-up device, at least one of reading out an image from the iris image pick-up devices, presenting at least of an image and a sound through the guiding device, or providing illumination with light from the illumination device.