Iris Capture Control via Blink Prediction and Guidance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Biometric authentication using iris patterns faces challenges in capturing high-quality images at a sufficient resolution for authentication and verification, especially when the subject is at a distance, has a wide field of view, and is moving, due to limitations in current image capture technology.
Innovation Solution
An image processing system with multiple iris image pick-up devices positioned differently within the same field of view, an overall image pick-up device for a wider field of view, guiding and illumination means, and control means that predict the subject's blinking and movement to control the image capture process, ensuring the iris is captured at the optimal focus point and avoiding blinking during image acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the radius of the iris is expressed by 100 to 140 pixels, then the granularity becomes 50 μm, but the pattern of the iris is microscopic and it is difficult to photograph an iris pattern at a level of quality sufficient for authentication and verification under conditions that distance between the subject and the image pick-up means is large, a field of view to be photographed is wide, and the subject moves
Solution Approach 1:
The patent divides the image capture task into multiple segments: using multiple iris image pick-up means disposed at mutually different positions, an overall image pick-up means for wider field of view, and specialized guiding means. This segmentation allows each component to focus on specific aspects (iris detail, overall context, subject guidance) to achieve high-resolution capture without requiring a single overly complex system
Solution Approach 2:
The patent adds temporal dimension control by predicting blink periods and focusing point passages, and spatial dimension optimization by positioning multiple image pick-up means at different locations. This multi-dimensional approach enables the system to capture high-quality iris patterns by coordinating capture timing and spatial positioning, overcoming the limitations of single-point capture
2Adaptability or versatility
If the subject moves and is at a distance with wide field of view, then the overall context is captured, but the iris pattern quality becomes insufficient for authentication
Solution Approach 1:
The system segments the imaging function between an overall image pick-up means (for wide field of view and context) and multiple iris image pick-up means (for high-resolution iris capture). This allows the system to adapt to different scenarios: capturing overall context when needed while maintaining the capability to capture high-quality iris patterns when the subject is positioned correctly
Solution Approach 2:
The patent implements dynamic control by predicting when the subject will blink and when they will pass through the focusing point. The control means dynamically adjusts the timing of iris image capture to coincide with optimal moments when the eye is open and in focus, enabling high-resolution capture despite subject movement and varying distances
3Productivity
If the subject blinks during the capture period, then the image is taken, but the authentication fails due to insufficient iris pattern quality
Solution Approach 1:
The control means performs preliminary prediction of the subject's blink periods and focusing point passage before actual capture. By anticipating these events, the system proactively adjusts capture timing to occur during optimal periods when the eye is open and in focus, preventing capture failures due to blinking rather than reacting after the fact
Solution Approach 2:
The system uses feedback from monitoring the subject's position and blink patterns to continuously adjust capture timing. The control means processes information about when the subject blinks and modifies the capture schedule accordingly, creating a closed-loop system that adapts to real-time subject behavior to maximize authentication reliability
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 captures high-resolution iris images suitable for authentication and verification even under challenging conditions of distance, wide field of view, and subject movement, reducing retry rates due to blinking.
Implementation Method 1
the wavelength of the near-infrared light applied to the eyes of the subject is in a range between 700 nm and 900 nm
Data Source
AI summary
Iris image pick-up devices perform image pick-up of an iris of a moving subject. A guiding device guides the subject. A controller predicts a period in which the subject will blink next. Further, the controller predicts a period in which the subject will pass through the focusing point of the iris image pick-up devices. The controller controls the guiding device such that the subject does not blink at the focusing point in the case where the period in which the subject will blink next overlaps with the period in which the subject will pass through the focusing point.