Iris Acquisition Auto-focusing System and Diagnostic Research

• Main Author: Yifan Liao
• Format: Article
• Language: English
• Published: IFSA Publishing, S.L. 2014-04-01
• Series: Sensors & Transducers
• Subjects: Iris acquisition; Auto-focusing; Contrast; Phase method; Iris diagnostic.
• Online Access: http://www.sensorsportal.com/HTML/DIGEST/april_2014/Vol_169/P_RP_0119.pdf

The auto-focusing method is described in this article based on image processing technology, and of an automatic iris image acquisition system is designed by the application of the principles. By using infrared lighting, the camera lens moving is control by computer, and in the human eye images are constantly collected in the process. First, the iris region is positioned in each image, and on the contrast of the area, we determines whether the iris image is a clear. By auto-focus, the captured image is used finally for identifying. Experiments proved that auto-focus is more accurate, iris images are captured with high contrast, and its texture features are rich significantly, and the requirements of subsequent processing and use are meet. Focusing mechanism is relatively simple, easy to implement the control system. It is applied to medical diagnostics to good effect.