Iris Authentication Image Correction for Interlace Noise
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Solution Overview
Problem
Biometric authentication using iris patterns faces challenges due to involuntary eye movements causing image jitter, which necessitates precise and timely correction of interlaced images to maintain authentication accuracy and speed.
Innovation Solution
An image processing apparatus that corrects interlaced images by moving a second line group relative to a first line group, calculating brightness differences, integrating these differences, and adjusting for relative displacement to minimize absolute values, thereby correcting misalignment between the two groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an image of an eye is picked up by an interlaced digital camera, then the image can be captured, but the iris or outer edge of pupil becomes jiggled due to involuntary eye movement
Solution Approach 1:
The patent applies preliminary action by performing interlace correction on the captured image data before iris pattern extraction and authentication processing. The correction unit processes the interlaced image lines to compensate for eye movement artifacts, ensuring that the iris pattern is accurately reconstructed before authentication. This preliminary correction prevents measurement errors from propagating through the authentication system.
2Measurement precision
If correction is performed on the jiggled image to improve authentication precision, then authentication accuracy improves, but processing time increases
Solution Approach 1:
The patent segments the correction process by dividing the image into interlaced line groups and processing them separately. The correction unit identifies corresponding lines between odd and even fields, calculates displacement vectors for each line pair, and applies correction independently to each segment. This segmentation enables parallel processing and reduces overall correction time while maintaining authentication precision.
Solution Approach 2:
The patent changes parameters by adjusting the correction amount dynamically based on detected eye movement characteristics. Instead of applying uniform correction to all image regions, the system modifies correction parameters (displacement magnitude and direction) according to local eye movement patterns, optimizing both correction accuracy and processing efficiency.
Data Source
AI summary
Interlace noises of the image of an iris included in the image of an eye picked up through an interlaced scheme are corrected precisely within a short time. An image processing apparatus (30) corrects a digital image P based on only low-brightness pixels configuring the image of a pupil included in the digital image P of an eye. Accordingly, interlace noises included in the image of the pupil of the eye and that of the iris can be corrected precisely within a short time. Next, a checking apparatus (50) performs authentication on a subject person based on the image of the iris specified based on the corrected digital image P. Hence, precise authentication is enabled.