Moving-Target Iris Imaging Using Wide-Camera Focus Coordination
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Solution Overview
Problem
Existing iris authentication systems struggle to capture images of moving targets properly, as they require selecting and setting parameters for the iris camera before the target reaches the focus position, which is not effectively addressed in Patent Literature 1.
Innovation Solution
The proposed imaging system includes a first imaging apparatus (wide camera) that captures images of the target at a trigger point, and a second imaging apparatus (iris camera) with a focus position set at a forward point along the target's moving direction. A control apparatus uses the wide camera's image to select and control the iris camera to capture the target's image at the focus point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the iris camera is selected and parameters are set before the moving target reaches the focus position, then the authentication can be performed, but the system cannot properly capture the image of the moving target
Solution Approach 1:
The wide angle camera captures an image of the moving target before the target reaches the focus position of the iris camera. This preliminary capture allows the control apparatus to determine the target's position and select the appropriate iris camera in advance, ensuring that when the target does reach the focus position, the correct camera is already selected and ready to capture the image with high precision.
2Adaptability or versatility
If the wide angle camera is used to capture the moving target, then the target can be captured at any position, but the image quality and authentication accuracy are insufficient
Solution Approach 1:
The imaging system is divided into two functional segments: a wide angle camera for capturing the target at various positions (providing adaptability) and an iris camera for capturing high-quality images at the focus position (providing measurement precision). The control apparatus coordinates both cameras, using the wide angle camera to track the moving target and switch to the iris camera when the target reaches the focus position, thus combining both adaptability and high image quality.
3Adaptability or versatility
If multiple iris cameras are provided, then the system can handle moving targets, but the complexity of selecting and controlling the appropriate camera increases
Solution Approach 1:
The control apparatus acts as an intermediary between the wide angle camera and the multiple iris cameras. It receives image data from the wide angle camera, processes this information to determine the target's position, and then selects and controls the appropriate iris camera. This intermediary role simplifies the overall system complexity by centralizing the decision-making logic in the control apparatus, which coordinates the switching between cameras based on real-time target position information.
Data Source
AI summary
An imaging system is provided with: a first imaging apparatus (2) that captures an image of an imaging target (T, TP) that is located at a first point (P1); a second imaging apparatus (3) a focus position of which is set at a second point (P2) that is located at a forward side along a moving direction of the imaging target than the first point; and a control apparatus (6) that controls the second imaging apparatus to capture an image of the imaging target that is located at the second point on the basis of the image (200) captured by the first imaging apparatus.