Automatic Iris Capture with Simultaneous Face Imaging
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Solution Overview
Problem
Conventional iris capture devices face challenges in quickly and accurately capturing iris images due to the small size of the iris area, requiring a high degree of cooperation and often necessitating separate captures of face and iris images, which may not ensure they belong to the same person.
Innovation Solution
An automatic iris snapshot method and apparatus that utilizes a human face imaging module to position eye coordinates, calculate a center coordinate, rotate an iris imaging module based on a pre-stored relationship, and simultaneously capture iris and face images, incorporating auto-focusing and error correction mechanisms to ensure accurate alignment and focus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional iris capture device is used, then the iris image can be captured, but the capture process is slow and requires high degree of cooperation from the user
Solution Approach 1:
The patent combines the face capture module and iris capture module into a single integrated device, allowing both face images and iris images to be captured simultaneously in one shot, eliminating the need for separate capture processes and reducing user cooperation requirements
Solution Approach 2:
The system performs preliminary face image capture and eye coordinate positioning before iris capture, automatically determining the optimal capture parameters and adjusting the iris capture module accordingly, so that the actual iris capture can be performed quickly without requiring user adjustment or cooperation
2Measurement precision
If the iris area is captured with high pixel density (about 20 pixel/mm), then the iris detail can be resolved, but the depth of field becomes small and the capture range is limited
Solution Approach 1:
The patent transitions from a single fixed-focus capture approach to a multi-dimensional solution by implementing both near-field and far-field capture zones with different optical configurations, allowing the system to adaptively switch between deep depth of field for far-field captures and high magnification for near-field captures
Solution Approach 2:
The system dynamically adjusts capture parameters based on the detected eye position and distance, automatically selecting appropriate focus settings and capture modes to optimize both the depth of field and iris detail resolution for each specific capture scenario
3Measurement precision
If face image and iris image are captured separately, then each image can be optimized, but it cannot be ensured they belong to the same person
Solution Approach 1:
The patent integrates the face capture and iris capture into a single simultaneous operation, capturing both face images and iris images in one shot with coordinated timing, which ensures that both images definitely belong to the same person while maintaining optimal quality for each image type through dedicated capture modules
Data Source
AI summary
The present application relates to the field of biometric recognition, and disclosed in the present application are an automatic iris capturing method and apparatus, a computer-readable storage medium, and a device. The method comprises: collecting a face image by using a face imaging module; positioning a left-eye coordinate and a right-eye coordinate on the face image; calculating a central coordinate of the two eyes according to the left-eye coordinate and the right-eye coordinate; obtaining a rotation angle of an iris imaging module according to the relationship between a prestored central coordinate of the two eyes and a prestored rotation angle; rotating the iris imaging module according to the rotation angle; and simultaneously collecting an iris image and the face image by using the iris imaging module and the face imaging module.