Adaptive Iris Recognition Illumination for Eyeglass Reflection Control
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Solution Overview
Problem
Iris recognition systems face prolonged processing times due to the need for dual illuminations when imaging individuals wearing glasses, as reflected light from lenses interferes with proper iris imaging.
Innovation Solution
An iris recognition apparatus and method that adjusts the irradiation mode of light based on a first image to optimize imaging of a narrower second image range focusing on the eye, using different illumination angles and wavelengths to minimize interference from eyeglass reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dual illumination modes are used for all target persons, then imaging quality for people wearing glasses is improved, but the time required for iris recognition increases
Solution Approach 1:
The system performs preliminary imaging with a first imaging range to capture the entire face before conducting the actual iris recognition imaging. This preliminary action allows the system to detect whether glasses are being worn and determine the appropriate illumination mode in advance, avoiding the need to try multiple illumination modes during the actual recognition process.
Solution Approach 2:
The imaging process is divided into two distinct stages: a first imaging range that captures the entire face for glasses detection, and a second imaging range that focuses specifically on the eye for iris recognition. This segmentation allows the system to optimize the illumination mode for each stage independently, using the first stage to inform the configuration of the second stage.
2Reliability
If imaging with multiple illumination modes is performed, then recognition accuracy for diverse conditions is improved, but processing efficiency deteriorates
Solution Approach 1:
The system uses the first image of the entire face to automatically determine the appropriate illumination mode for the second imaging range. This self-service approach allows the system to adapt to different conditions (glasses wearing or not) without requiring manual intervention or trying multiple modes, thereby maintaining high recognition accuracy while improving processing efficiency.
Solution Approach 2:
The first imaging range captures information about the target person's condition (whether wearing glasses) before the actual iris recognition imaging. This preliminary action enables the system to pre-determine the optimal illumination mode, ensuring recognition accuracy is maintained while avoiding the time loss associated with trial-and-error multiple imaging approaches.
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 optimizing illumination settings based on the first image analysis, thereby improving efficiency.
Implementation Method 1
an apparatus, which images with two types of illumination that are an illumination suitable for a target person wearing hard contact lenses and an illumination suitable for a target person wearing glasses
Data Source
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.