Automatically focused remote iris image acquisition device, method and recognition system

Abstract

The invention relates to an automatically focused remote iris image acquisition device, an automatically focused remote iris image acquisition method and a recognition system. The device comprises an iris camera, a long-focus lens, a focusing drive unit, a lens converter, a focusing rotating machine, a motor drive unit and a computational processing unit; and the automatic focusing method based on the device comprises the following steps of: initializing focusing equipment; continuously acquiring iris images by the camera; computing the definition and definition change of the acquired images by the computational processing unit; determining the focusing speed and direction according to the current state and state transition condition of the system; and detecting clear eye images from the image sequence for iris recognition. Based on the focusing device and the focusing method, the range of depth of field and speed of acquiring remote iris images can be increased greatly. Furthermore, the remote iris image recognition system using the method and the device is more convenient and easy to use.

Description

technical field [0001] The invention belongs to the technical fields of image processing, electromechanical control, computer vision and pattern recognition, and relates to an iris recognition and automatic focusing remote iris image acquisition device and method applied in the field of biological feature recognition. Background technique [0002] Among the current biometric identification technologies, iris recognition technology has the advantages of high accuracy, good uniqueness, strong anti-counterfeiting, and easy image processing, and has broad market application prospects. The steps of iris recognition generally include steps such as iris image acquisition, image preprocessing, iris location, liveness detection, feature extraction and feature matching. Among them, iris image acquisition is a very important link. If the iris acquisition is not done well, the image acquisition speed will be slowed down and the recognition rate will be greatly reduced. [0003] It is v...

AI Technical Summary

Problems solved by technology

(Chinese patents: CN1892401, CN2672768, CN1894719, etc.) These are all very beneficial methods, but there are still several problems in the current focusing products: first, they all adopt short-distance focusing equipment, at a fixed distance and limited Second, in the focus system, when the focus position changes, it cannot quickly track the new focu

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