Multi-camera Iris Authentication with Optical Filtering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In iris authentication systems, the accuracy of authentication is compromised when the person to be authenticated directs their line of sight to a camera other than the optimally positioned iris camera.
Innovation Solution
An imaging device is designed with a visible light camera and multiple infrared light cameras, where an optical filter with a pass band in the infrared region and a blocking band in the visible region is used to cover the infrared cameras' light receiving surfaces, while the visible light camera captures the face, guiding the user's attention with a mirror surface and ensuring accurate iris imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple infrared light cameras are arranged in a vertical direction to capture iris images, then the coverage of different eye heights is improved, but the complexity of the device increases and the risk of user gaze misdirection to non-optimal cameras remains
Solution Approach 1:
The system segments the imaging function by providing multiple infrared light cameras at different vertical positions, each capable of capturing iris images from different eye heights. This segmentation allows the system to adapt to users with varying eye levels while maintaining specialized functionality for each camera position.
Solution Approach 2:
The visible light camera serves as an intermediary that captures the user's face image and gaze direction. This intermediary information is then used by the control device to determine which infrared light camera should be activated, mediating between the user's natural gaze and the optimal infrared camera selection.
2Measurement precision
If the visible light camera captures the user's face to guide their gaze, then the accuracy of iris authentication is improved, but the device complexity increases due to additional cameras and optical filters
Solution Approach 1:
The visible light camera performs multiple functions: it captures the user's face image for gaze detection and simultaneously serves as a guide to direct the user's attention toward the optimal infrared light camera. This multi-functionality reduces the need for separate guidance mechanisms while improving authentication accuracy.
Solution Approach 2:
The system uses feedback from the visible light camera's capture of the user's face and gaze direction to dynamically determine which infrared light camera should be activated. This feedback loop ensures that the system adapts to the user's current state and selects the most appropriate camera for accurate iris authentication.
3Measurement precision
If an optical filter with infrared pass band and visible blocking band is used to cover infrared cameras, then the infrared image quality is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The optical filter is applied locally to each infrared light camera, providing selective transmission of infrared light while blocking visible light at each camera's light receiving surface. This local application ensures that each camera receives optimized light conditions for infrared capture without affecting other parts of the system.
Solution Approach 2:
The system uses composite optical filtering that combines infrared transmission properties with visible light blocking properties in a single filter component. This composite approach allows the filter to perform multiple optical functions simultaneously, improving infrared image quality while maintaining a compact design.
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
This configuration enhances the accuracy of iris authentication by ensuring the user naturally faces the correct camera, reducing errors associated with misdirected gaze and improving the quality of iris images captured.
Implementation Method 1
an optical filter that is provided on the housing so as to cover a light receiving surface of each of the plurality of infrared light cameras and not to cover a light receiving surface of the visible light camera, and has a pass band in an infrared region and a blocking band in a visible region
Data Source
AI summary
An imaging device according to this disclosure includes: a visible light camera that captures an image of a face of a person to be authenticated; a plurality of infrared light cameras that is provided on a housing with the visible light camera and captures an image of an iris of the person to be authenticated; and an optical filter that is provided on the housing so as to cover a light receiving surface of each of the plurality of infrared light cameras and not to cover a light receiving surface of the visible light camera, and has a pass band in an infrared region and a blocking band in a visible region.