Iris Recognition Fill Light Reduces Reflective Spots
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Solution Overview
Problem
Traditional iris recognition technology faces challenges with low image quality, limited range, and restrictive conditions for collecting iris characteristics, leading to inaccuracies and reduced practical value.
Innovation Solution
An iris recognition device employing a fill light method with an infrared LED light source to reduce reflective spots and provide uniform brightness, allowing for accurate iris characteristic collection at a distance, and integration with face recognition technology for enhanced identity verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional iris recognition technology is used without fill light, then device complexity is reduced, but image quality and measurement precision deteriorate due to reflective spots and non-uniform brightness
Solution Approach 1:
The patent introduces a fill light component as an intermediary element between the light source and the iris. This fill light serves as a mediator to provide supplementary illumination that fills in shadowed areas and reduces harsh reflections, thereby improving image quality without requiring complete redesign of the optical system. The fill light component includes a diffuser that scatters light to create uniform illumination across the iris region.
Solution Approach 2:
The patent modifies the lighting parameters by introducing fill light with specific luminance characteristics and angular distribution. The fill light component is designed to emit light within a specific angle range (e.g., 30-60 degrees) and with controlled intensity relative to the main light source. This parameter optimization allows improvement in image quality while controlling device complexity through standardized component design.
2Illumination intensity
If traditional single light source is used, then device complexity is minimized, but image quality deteriorates due to reflective spots and non-uniform brightness distribution
Solution Approach 1:
The lighting system is segmented into two distinct functional components: a main light source for primary illumination and a fill light component for supplementary lighting. The fill light component is further segmented into multiple light-emitting elements arranged in an array, with each element contributing to different regions of the iris. This segmentation allows independent optimization of each component's characteristics while achieving overall system goals.
Solution Approach 2:
The fill light component is designed with spatially varying properties to address local illumination needs. The light-emitting elements are positioned and oriented to provide targeted illumination to specific regions of the iris that require additional light. The diffuser material is designed with varying optical properties to distribute light non-uniformly in a controlled manner, ensuring uniform overall illumination while accounting for local geometric variations in the iris region.
3Adaptability or versatility
If close range imaging is used, then measurement precision is maintained, but adaptability deteriorates as it cannot capture iris characteristics at distance
Solution Approach 1:
The iris recognition device is designed with multi-functional capabilities to operate effectively across a wide range of distances. The fill light component is engineered to maintain its illumination effectiveness whether the subject is close or far, allowing the device to function universally across different scanning scenarios. The optical system incorporates adjustable parameters and multiple focal points that enable the device to adapt to various working distances while maintaining image quality and measurement precision.
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
Improves the precision and range of iris recognition, enabling accurate user identification and integration with other biometric technologies for enhanced security and convenience.
Implementation Method 1
a fill light method with an infrared LED light source to reduce reflective spots and provide uniform brightness
Implementation Method 2
the fill light method can reduce reflective spots on the iris or make reflective spots in areas other than iris such as sclera and pupil
Data Source
AI summary
The iris recognition device includes an iris camera module used for collecting iris characteristics of a user, and at least one fill light component used for providing a supplementary light source for the iris camera module. When the iris recognition device is used for collecting the iris characteristics of the user, the supplementary light source provided by the fill light component reduces reflective spots on the iris or make reflective spots in areas other than iris such as sclera and pupil, thereby improving precision of the collected iris characteristics of the user.