Iris Imaging System Using 3D Position Estimation for Accurate Capture
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Solution Overview
Problem
In iris authentication systems, capturing the iris region accurately is challenging due to variations in the position and depth of the target person, leading to potential failures in image capture and authentication processes.
Innovation Solution
An imaging system that includes an iris camera and a wide field of view camera, with a control device that estimates the three-dimensional position of the target person, selects a coordinate transformation matrix, transforms coordinates, and sets parameters for accurate iris image capture using a combination of acquisition, estimation, selection, transformation, and setting means to ensure proper alignment and focus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single iris camera is used to capture iris images, then the device complexity is reduced, but the reliability of capturing accurate iris images deteriorates due to variations in target person position and depth
Solution Approach 1:
The patent combines a wide-field camera and an iris camera into an integrated imaging system. The wide-field camera captures the entire target person to determine three-dimensional position, while the iris camera captures high-resolution iris images. This merging allows the system to adapt to position variations and reliably capture iris images without requiring multiple separate systems.
Solution Approach 2:
The patent introduces coordinate transformation matrices as an intermediary mechanism to map positions between the wide-field camera view and the iris camera view. This mathematical intermediary enables accurate positioning and focusing of the iris camera based on the broader context provided by the wide-field camera, resolving the contradiction between using a single camera system and maintaining capture reliability.
2Ease of operation
If the angle of view of the iris camera is increased to capture the entire target person, then the ease of operation is improved, but the measurement precision of the iris region deteriorates
Solution Approach 1:
The patent segments the imaging function into two distinct cameras: a wide-field camera for capturing the entire target person and an iris camera for capturing high-resolution iris images. This segmentation allows each camera to be optimized for its specific function, with the wide-field camera providing broad coverage and the iris camera providing detailed iris capture, thus resolving the contradiction between ease of operation and measurement precision.
Solution Approach 2:
The patent adds the spatial dimension by using two cameras with different fields of view rather than trying to make a single camera perform both functions. The wide-field camera operates in a broader spatial context while the iris camera focuses on a specific region, effectively using dimensional differentiation to resolve the contradiction between capturing the whole person and capturing iris details.
3Productivity
If coordinate transformation matrices are pre-calculated for multiple positions, then the productivity is improved, but the device complexity increases due to multiple matrices
Solution Approach 1:
The patent pre-calculates and stores coordinate transformation matrices for multiple possible positions of the target person before actual iris capture. This preliminary preparation allows the system to quickly select and apply the appropriate transformation matrix during operation, improving processing speed and productivity while avoiding complex real-time calculations.
Data Source
AI summary
An imaging system includes: an acquisition unit acquiring an iris image captured by an iris imaging means for capturing an iris of a target person or a whole image captured by a whole imaging means for capturing the target person; an estimation unit estimating a three-dimensional position of a target person being included in the acquired whole image; a selection unit selecting a coordinate transformation matrix that transforms a three-dimensional position of the target person into two-dimensional coordinates; a transformation unit transforming coordinates of an eye of a target person being included in a whole image associated with the estimated three-dimensional position into two-dimensional coordinates, based on the selected coordinate transformation matrix; and a setting unit setting, based on the transformed coordinates of an eye of the target person, a parameter for capturing an iris of the target person by the iris imaging means.