Iris Biometric System Design with Synchronized Stroboscopic Illumination
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Solution Overview
Problem
Iris-based biometric systems face limitations in minimally constrained settings due to the need for high-resolution, high-contrast images, which restricts capture volume and standoff distance, making them unsuitable for applications like airports and uncontrolled buildings, and requires time-consuming and costly trial-and-error tuning to design systems for specific environments.
Innovation Solution
A method and apparatus for designing iris biometric systems using synchronized stroboscopic illumination that operates within specific design parameters, allowing for safe and effective iris recognition over long distances, with a computer system processing input constraints to generate optimal system parameters for various scenarios such as security checkpoints, offices, and vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high resolution, high contrast images of the iris are obtained using traditional illumination and capture methods, then identification accuracy is improved, but capture volume is limited to a small region within a few 10's of centimeters of the sensor
Solution Approach 1:
The patent applies periodic action by using pulsed illumination sources that flash at specific intervals synchronized with the camera shutter. This allows the system to capture multiple images at different illumination phases, enabling both high contrast iris imaging and extended capture volume by illuminating subjects at various distances sequentially rather than requiring continuous high-power illumination that would limit range.
2Measurement precision
If the subject is positioned within the limited field of view of a single illumination and image capture device, then high resolution iris images are obtained, but the system requires careful positioning and is unsuitable for minimally constrained settings
Solution Approach 1:
The patent applies segmentation by dividing the illumination function into multiple independent illumination sources positioned at different locations and angles. This allows the system to illuminate the iris from multiple directions simultaneously or sequentially, maintaining high image quality without requiring precise subject positioning within a single narrow field of view, thereby simplifying system setup in minimally constrained settings.
3Adaptability or versatility
If synchronized stroboscopic illumination is used to extend standoff distance and capture volume, then applicability in minimally constrained settings is improved, but illumination power and system complexity increase
Solution Approach 1:
The patent uses synchronized stroboscopic illumination where multiple illumination sources flash in periodic synchronization with the camera shutter. This allows extension of standoff distance and capture volume by capturing images at different illumination phases, achieving adaptability in minimally constrained settings while managing complexity through synchronized timing rather than requiring continuously high-power illumination from all sources simultaneously.
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
Enables iris recognition in minimally constrained settings with extended standoff distances and capture volumes, improving applicability and reducing design time and costs by providing a systematic approach to configuring iris biometric systems for different environments.
Implementation Method 1
synchronized stroboscopic illumination that operates within the design parameters
Data Source
AI summary
A method and apparatus for designing an iris biometrics system that operates in minimally constrained settings. The image acquisition system has fewer constraints on subjects than traditional methods by extending standoff distance and capture volume. The method receives design parameters and provides derived quantities that are useful in designing an image acquisition system having a specific set of performance requirements. Exemplary scenarios of minimally constrained settings are provided, such as a high volume security checkpoint, an office, an aircraft boarding bridge, a wide corridor, and an automobile.