Iris Imaging Layout to Avoid Eyelash Obstruction and Red-Eye
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Solution Overview
Problem
Existing iris authentication systems fail to provide a reliable method for quickly capturing high-quality iris images due to inadequate positioning of the camera and light source relative to the user's eyes, leading to issues like red-eye phenomenon and obstruction by eyelashes and eyelids.
Innovation Solution
The iris authentication device positions the camera and lighting below the user's line of sight, with a controlled imaging angle of 1 to 20 degrees, guiding the user's gaze to ensure a clear iris image capture by avoiding obstructions and optimizing the lighting position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the camera and light source are positioned at conventional heights, then the device structure is simple, but the captured iris image is obstructed by eyelashes and eyelids
Solution Approach 1:
The patent inverts the conventional positioning by placing the camera and light source below the subject's eye level rather than above or at eye level. This inversion allows the camera to capture the iris from a lower angle, avoiding obstruction by eyelashes and eyelids while maintaining simple device structure
Solution Approach 2:
The patent introduces a vertical dimension change by positioning the camera and light source at a lower height than the subject's eyes. This dimensional adjustment creates a new imaging angle that avoids the obstruction problem without complicating the horizontal arrangement of devices
2Manufacturing precision
If the camera is positioned at eye level, then the imaging angle is straightforward, but red-eye phenomenon occurs
Solution Approach 1:
The patent applies inversion by positioning the camera and light source below eye level rather than at eye level. This changes the imaging angle to avoid the red-eye phenomenon while maintaining clear iris capture capability
Solution Approach 2:
The patent changes the imaging angle parameter by adjusting the camera position to a lower height. This parameter modification eliminates the red-eye phenomenon by altering the light path and imaging geometry
3Reliability
If multiple cameras and light sources are arranged for each eye, then the authentication accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing a single camera and light source configuration that can authentically capture iris images from both eyes through the optimized lower positioning. This multi-functional arrangement eliminates the need for separate camera-light source pairs for each eye, reducing device complexity while maintaining authentication accuracy
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 allows for rapid and high-quality iris image capture, enhancing authentication accuracy and efficiency by minimizing obstructions and ensuring adequate iris area exposure.
Implementation Method 1
lighting that is installed either at a same height as the position of the camera or at a position lower than the camera and that irradiates the authentication target person with light
Data Source
AI summary
An iris authentication device includes: a camera that is installed at a position lower than a line of sight of an authentication target person; lighting that is installed either at a same height as the position of the camera or at a position lower than the camera and that irradiates the authentication target person with light; and an authentication unit that performs authentication of the authentication target person by collating an iris that appears in an image of the authentication target person with a pre-registered iris image, the image of the authentication target person being captured by the camera from lower front while the lighting is irradiating the light.