Iris Imaging With Reflection Correction for Eyeglass Wearers
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Solution Overview
Problem
Existing imaging systems struggle to capture clear iris features when a target person is wearing eyeglasses due to light reflection from the eyeglass lenses, which can saturate pixel values and obscure iris details.
Innovation Solution
An imaging system that uses an image sensor with a wide dynamic range to capture images without saturating light, separates first information from areas without light reflection and second information with reflection, and corrects the second information based on the first information to reduce the influence of eyeglass lens reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an image sensor is used to capture iris images, then iris features can be obtained, but light reflection from eyeglass lenses causes pixel saturation and obscures iris details
Solution Approach 1:
The patent segments the image into multiple regions: a first region containing the iris and a second region containing the eyeglass lens reflection. By separating these regions, the system can process and correct the reflection in the second region independently, preventing it from interfering with iris feature extraction in the first region.
Solution Approach 2:
The patent converts the harmful reflection effect into a useful correction opportunity. By detecting the reflection in the second region and calculating its characteristics, the system generates correction data that can be applied to remove or reduce the reflection's harmful impact on the iris image quality.
2Ease of operation
If conventional image sensors are used, then imaging can be performed, but pixel saturation occurs due to strong reflected light
Solution Approach 1:
The patent processes the image in multiple dimensional aspects: spatial segmentation into first and second regions, and correction dimension by generating and applying correction data. This multi-dimensional approach allows the system to handle saturated pixels by correcting them based on reflection characteristics rather than losing information due to saturation.
3Measurement precision
If users are required to remove eyeglasses for imaging, then reflection interference is eliminated, but user convenience and imaging efficiency decrease
Solution Approach 1:
The system performs self-correction by automatically detecting eyeglass lens reflections and generating correction data without requiring user action. The correction unit processes the reflected light characteristics and applies corrections autonomously, eliminating the need for users to remove their eyeglasses while maintaining imaging efficiency.
4Measurement precision
If multiple images are captured to overcome reflection, then image quality may improve, but imaging time and user burden increase
Solution Approach 1:
The patent introduces correction data as an intermediary element that mediates between the reflected light and the final iris image. By calculating correction data from the second region and applying it to remove reflection effects, the system achieves clear iris images in a single capture rather than requiring multiple attempts.
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
The system effectively generates a clear iris image even when eyeglasses are worn, improving iris authentication accuracy and convenience by reducing the need for the user to remove glasses or re-take images.
Implementation Method 1
an eyeglass lens may reflect illumination light
Data Source
AI summary
An imaging system includes: an imaging unit that captures an image of an eye area of a target person by using an image sensor that allows imaging without saturating observed light; an acquisition unit that obtains, from the image, a first information about a first area that does not include reflection of light by an eyeglass lens of the target person, and a second information about a second area that includes the reflection of the light; and a correction unit that corrects the second information so as to reduce an influence of the reflection, on the basis of the first information. According to such an imaging system, it is possible to properly capture the iris image even when the target person is wearing eyeglasses.