Iris Recognition Illumination Selection for Eyeglass Reflection Control
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Solution Overview
Problem
Iris recognition systems face prolonged processing times when individuals wear glasses due to imaging issues caused by reflected light from eyeglass lenses, necessitating the use of multiple illumination types that increase recognition time.
Innovation Solution
An iris recognition apparatus with multiple light sources having different incident angles, allowing for selective adjustment of illumination modes based on initial imaging to minimize interference from eyeglass reflections, thereby optimizing the imaging process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If imaging with two types of illumination is performed for all target persons, then the iris can be properly imaged even when wearing glasses, but the time required for iris recognition becomes relatively long
Solution Approach 1:
The system performs preliminary imaging with a first illumination type to detect the presence of eyeglasses before selecting the appropriate second illumination type for actual iris recognition. This preliminary detection action avoids performing both illumination types for all subjects, thereby reducing recognition time while ensuring proper iris imaging when glasses are present
Solution Approach 2:
The system changes illumination parameters (illumination type selection) based on detected conditions (presence of eyeglasses). By adjusting the illumination parameter from a default single type to an optimized two-type approach only when needed, the system resolves the contradiction between reliable imaging and fast recognition
2Adaptability or versatility
If multiple light sources with different incident angles are used, then the adaptability to different wearing conditions is improved, but the device complexity increases
Solution Approach 1:
The system uses preliminary imaging with a simple first illumination to detect eyeglass presence, then selectively activates specific second illumination types only when needed. This approach achieves high adaptability without requiring all multiple light sources to be active simultaneously, thereby managing device complexity
Solution Approach 2:
The multiple light sources are designed to serve different functions: one for preliminary detection and another for specialized iris imaging when glasses are present. This multi-functionality allows the system to achieve high adaptability while managing complexity by having each light source serve a specific purpose rather than all sources being equally complex
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 approach reduces the time required for iris recognition by dynamically adjusting illumination settings based on initial imaging, enhancing efficiency and accuracy.
Implementation Method 1
an irradiating device that is capable of irradiating light to a target person to be recognized
Implementation Method 2
an acquiring device that acquires a first image which imaged a first imaging range including at least a face of the target person
Data Source
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AI summary
An iris recognition apparatus is provided with: an irradiating device that is capable of irradiating light to a target person to be recognized; an acquiring device that acquires a first image which imaged a first imaging range including at least a face of the target person; and a determining device that determines an irradiation mode of light irradiated from the irradiating device to the target person when imaging a second image including an area, which includes an eye of the target person, and corresponding to a second imaging range, which is narrower than the first imaging range, based on the first image.