Iris Capture Guidance Head Movement Eyelid Coverage
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Solution Overview
Problem
Iris authentication systems face challenges in reducing the influence of eyelid coverage, leading to inaccurate iris matching due to the iris being obscured by eyelashes or the upper eyelid.
Innovation Solution
An information acquisition apparatus that outputs guidance information to the subject to move their head while gazing at a predetermined position, allowing the system to capture an iris image with reduced eyelid coverage by synchronizing the head movement with image acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the subject is instructed to open their eye for iris capture, then the possibility of erroneous authentication is reduced, but the influence of eyelid coverage on the iris remains insufficiently reduced
Solution Approach 1:
The patent transforms the static eye-opening instruction into a dynamic head movement instruction. By guiding the subject to move their head in specific directions (upward, downward, leftward, rightward) while maintaining eye opening, the system dynamically changes the relative position between the iris and eyelid, thereby reducing eyelid coverage influence on the iris capture quality and improving authentication reliability
Solution Approach 2:
The patent applies preliminary action by instructing the subject to perform head movements before the actual iris image capture. The guidance information directs the subject to move their head to optimal positions in advance, ensuring that when the iris image is captured, the eyelid coverage is already minimized, thus improving authentication accuracy before the critical measurement moment
2Ease of operation
If a display unit showing attention at the upper side of the image capturing unit is provided, then eye opening is facilitated, but eyelid coverage of the iris is not sufficiently reduced
Solution Approach 1:
The patent extends the guidance from a two-dimensional display indication to a three-dimensional head movement instruction. Instead of merely showing attention on the display unit, the system provides guidance information that directs the subject to move their head in spatial dimensions (upward, downward, leftward, rightward), creating a new dimension of control that effectively reduces eyelid coverage while maintaining ease of operation
Solution Approach 2:
The patent changes the parameter of head position as a new control variable. By instructing the subject to change head position parameters (vertical and horizontal movements) in addition to eye opening, the system achieves better iris capture quality. The guidance information dynamically adjusts these positional parameters to optimize the iris exposure area
Data Source
AI summary
There is provided an information acquisition apparatus including an output means for outputting guidance information for guiding a subject to move a head while gazing at a predetermined position, and an image acquisition means for acquiring an image including an iris of the subject after outputting the guidance information.