Dual Camera Iris Authentication Target Selection
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Solution Overview
Problem
In iris authentication systems, the narrow imaging range of the iris camera often overlaps with the wider imaging range of the face camera, leading to the potential selection of undesirable individuals for authentication instead of the intended target.
Innovation Solution
The system employs a first imaging apparatus for capturing a face image within a specific range, a second imaging apparatus with a wider range to capture a broader scene, and a control apparatus that selects the target person based on a target area within the second image that includes a predetermined portion of a person and a reference area corresponding to the first imaging range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a telephoto camera is used as the iris imaging camera to capture detailed iris images, then the imaging precision is improved, but the imaging range becomes narrower causing overlap with the face imaging camera's range and leading to incorrect target person selection
Solution Approach 1:
The patent divides the imaging function into two separate cameras: a face imaging camera with a wide imaging range for capturing the overall scene and identifying candidate persons, and an iris imaging camera with a narrow imaging range for capturing detailed iris images. The control apparatus segments the target selection process by using the face image to identify which person should be the authentication target, then directing the iris camera to capture the iris image of that specific person. This segmentation resolves the contradiction by allowing each camera to be optimized for its specific function without the target selection problem.
2Area of stationary object
If the face imaging camera captures a wide area to identify multiple persons, then the coverage area is improved, but the precision of selecting the correct target person deteriorates due to overlapping imaging ranges
Solution Approach 1:
The control apparatus performs preliminary action by first capturing a face image with the face imaging camera to identify the target person before the iris imaging camera captures the iris image. The system uses the wide-area face image to determine which person should be authenticated, then directs the narrow-range iris camera to capture only that person's iris. This preliminary identification step prevents incorrect target selection by establishing the target person before the precise iris capture occurs.
Data Source
AI summary
An authentication system (1) is provided with: a first imaging apparatus (3) that obtains a first image (300) used for an authentication by capturing an image of a first imaging range; a second imaging apparatus (3) that obtains a second image (200) by capturing an image of a second imaging range that is wider than the first imaging range; and a control apparatus (6) that selects a target person (Ta) for the authentication on the basis of a target area (TA) in the second image that includes a predetermined portion (TP) of a person (T) and a reference area (RA) in the second image that corresponds to the first imaging range.