Iris Recognition Apparatus Using Visible-First Conditional Infrared Capture
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Solution Overview
Problem
Iris recognition technologies expose users' eyes to excessive infrared rays, potentially causing eye damage, especially when used in portable devices outdoors where external light intensifies the infrared exposure.
Innovation Solution
An iris recognition apparatus and method that uses a combination of visible and infrared photography, where the apparatus first photographs the iris in the visible wavelength range to determine if it meets predetermined conditions, such as size and location, before projecting infrared rays for recognition, thereby minimizing exposure time to infrared rays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If infrared rays are used to photograph the iris for recognition, then the iris pattern can be captured effectively, but the eyes are exposed to harmful infrared radiation that may cause dryness or cataracts
Solution Approach 1:
The system first photographs the iris in the visible wavelength range to determine whether it satisfies predetermined conditions (such as image quality, iris openness, and positioning) before projecting infrared rays. This preliminary check ensures that infrared exposure occurs only when necessary and optimal, minimizing unnecessary infrared radiation exposure to the user's eyes while still achieving effective iris pattern capture when conditions are appropriate
Solution Approach 2:
The system changes the wavelength parameter of the light used for photographing between visible and infrared ranges. By switching between different wavelength parameters based on whether predetermined conditions are met, the system optimizes the balance between capturing effective iris patterns and minimizing harmful infrared exposure to the eyes
2Measurement precision
If infrared rays are continuously projected for iris recognition, then recognition accuracy can be maintained, but the exposure time to infrared rays increases causing potential eye damage
Solution Approach 1:
The system uses periodic action by first photographing in the visible range to check conditions, then conditionally projecting infrared rays only when needed. This periodic checking and conditional execution creates a rhythm of minimal necessary infrared exposure, maintaining recognition accuracy while significantly reducing cumulative exposure duration compared to continuous infrared projection
Solution Approach 2:
The visible wavelength photographing serves as a preliminary action that determines whether infrared projection is necessary. This preliminary check prevents unnecessary infrared exposure by only proceeding to infrared photographing when the iris meets predetermined conditions, thereby maintaining accuracy while minimizing exposure time
3Duration of action of moving object
If the apparatus checks iris conditions before infrared photography, then infrared exposure time is reduced, but the device complexity increases due to multiple photographers and controllers
Solution Approach 1:
The first photographer is designed to serve multiple functions: it photographs the iris in visible range for condition assessment and also provides the basis for determining whether infrared projection is necessary. This multi-functionality reduces the need for completely separate systems while still achieving the goal of minimizing infrared exposure time through conditional photographing
Solution Approach 2:
The system merges the condition checking function and the infrared photographing function into a coordinated sequence controlled by a single controller. By combining these functions under unified control rather than using completely independent systems, the apparatus reduces overall complexity while still achieving reduced infrared exposure time through the conditional photographing process
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
Reduces the time users are exposed to infrared rays during iris recognition and improves recognition accuracy by ensuring optimal eye positioning and iris conditions.
Implementation Method 1
An iris image is obtained by scanning the iris with infrared rays and photographing the infrared rays reflected back from the iris
Implementation Method 2
The second photographer is configured to project the infrared rays onto the iris and photograph the iris projected with the infrared rays
Data Source
AI summary
An iris recognition apparatus is provided. The iris recognition apparatus includes a first photographer configured to photograph an iris in a visible ray wavelength range, a second photographer configured to photograph in an infrared ray wavelength range, a determiner configured to determine whether the iris photographed by the first photographer satisfies a predetermined condition, and a controller configured to, in response to the photographed iris satisfying the predetermined condition, control the second photographer to photograph the iris, and to perform iris recognition using the iris photographed in the infrared ray wavelength range.