Iris Recognition Liquid Lens Focusing Overlap
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Solution Overview
Problem
Existing iris recognition systems face long recognition times due to the need to image multiple focused frames, which is inefficient when the subject moves during imaging.
Innovation Solution
An iris recognition apparatus that uses an imaging device to sequentially output images while changing the focal position and starts focusing determination before completing imaging, utilizing a liquid lens to adjust the focal position based on applied voltage, allowing for immediate recognition once a focused image is determined.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple images are imaged by changing focal position before iris recognition is performed, then the reliability of iris recognition is improved, but the time required for iris recognition becomes relatively long
Solution Approach 1:
The patent applies preliminary action by starting the focusing determination process before the imaging processing is completed. The determining device begins evaluating whether imaged images are focused images while the imaging device is still capturing images at different focal positions, rather than waiting for the entire imaging sequence to finish. This overlap of operations reduces the total time required for iris recognition while maintaining reliability through systematic focusing evaluation.
2Measurement precision
If iris recognition is performed only after multiple images are imaged, then the accuracy of focused image selection is improved, but the processing speed is reduced
Solution Approach 1:
The patent implements continuity of useful action by making the focusing determination and image capture operations overlap in time. The determining device continuously evaluates focused image status while the imaging device continuously captures images at different focal positions. This continuous, overlapping processing maintains high accuracy in focused image selection while significantly improving processing speed compared to sequential operations.
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 enabling focusing determination and recognition during ongoing imaging, improving efficiency and reducing the likelihood of recognition failures compared to systems that wait until multiple images are captured.
Implementation Method 1
utilizing a liquid lens to adjust the focal position based on applied voltage
Data Source
AI summary
An iris recognition apparatus for performing recognition of a target person based on an iris pattern of the target person, is provided with: an imaging device that performs an imaging processing for sequentially outputting imaged images while changing a focal position; and a determining device that starts a focusing determination for determining whether or not an image is a focused image before the imaging device completes the imaging processing.