Iris Biometric Capture Using Camera Array for Moving Subjects
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Iris-based biometric systems are limited by the requirement for high resolution, high contrast images of the iris, which can only be obtained from a stationary subject within a small capture volume, restricting their use in minimally constrained settings such as airports or uncontrolled buildings.
Innovation Solution
A method and apparatus that extends the standoff distance and capture volume by using an array of cameras and an image processor to capture and process images of moving subjects, with synchronized illumination and image processing to extract clear iris images, allowing for identification even when subjects are not actively involved or positioned correctly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single camera with limited field of view is used to capture iris images, then high resolution and high contrast images can be obtained, but the capture volume is limited to a small region and the subject must remain stationary
Solution Approach 1:
The system divides the capture volume into multiple cells, with each cell corresponding to at least one camera in the array. This segmentation allows the system to cover a larger overall volume while maintaining adequate image quality in each cell, resolving the contradiction between limited single-camera field of view and the need for large capture volume
2Measurement precision
If a single camera system is used with strict positioning requirements, then high resolution iris images can be captured, but the system cannot handle moving subjects or minimally constrained settings
Solution Approach 1:
The system transitions from a single-camera 2D capture approach to a multi-camera 3D volume capture approach. By adding the spatial dimension of multiple cameras arranged in an array, the system can capture subjects in minimally constrained settings while maintaining image quality through the selection of suitable images from the volume
3Adaptability or versatility
If the capture volume is extended to accommodate moving subjects, then applicability in minimally constrained settings improves, but image quality may deteriorate due to motion and distance variations
Solution Approach 1:
The system captures multiple images of the subject as they move through the capture volume, processing these images to extract at least one clear image of the iris. By capturing more images than strictly necessary (excessive action) and selecting the best quality image, the system maintains image clarity while accommodating moving subjects in extended capture volumes
Data Source
AI summary
A method and apparatus for obtaining iris biometric information that provides increased standoff distance and capture volume is provided herein. In one embodiment, a system for obtaining iris biometric information includes an array of cameras defining an image capture volume for capturing an image of an iris; and an image processor, coupled to the array of cameras, for determining at least one suitable iris image for processing from the images generated for the image capture volume. The image capture volume may include a plurality of cells, wherein each cell corresponds to at least one of the cameras in the array of iris image capture cameras.