Device and method for acquiring iris images

An iris image and acquisition device technology, which is applied in the field of automatic iris image acquisition equipment, can solve the problems of difficulty in acquiring iris images, requirements of the examinee, manual operation, etc., and achieves prevention of eye discomfort, low price of the device, and elimination of reflection points. Effect

Inactive Publication Date: 2013-04-03
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, since the diameter of the iris is very small, and the collected iris image must have enough pixels, the acquisition of the iris image is also a very difficult link.
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  • Device and method for acquiring iris images
  • Device and method for acquiring iris images
  • Device and method for acquiring iris images

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Embodiment Construction

[0044] Such as figure 1 , figure 2 , image 3 As shown, an iris image acquisition device with automatic centering and focusing of the present invention includes an imaging module, an illumination module, a three-dimensional motion platform, a control module 9, an optical platform 7, a fixed rod and a chin rest 5, and the chin rest passes through the fixed rod Fixed on the optical platform, the imaging module is fixed on the three-dimensional motion platform 6, which includes a fixed-focus lens 3, a CCD camera 1 and a half-mirror 2, wherein the half-mirror is located between the CCD camera and the fixed-focus lens Between; described lighting module comprises light source fixing plate 8, light intensity adjuster and is arranged on the near-infrared LED luminescent tube 4 that is annularly arranged on the light source fixing plate, the infrared light beam of described near-infrared LED luminous tube and the main body of CCD camera The optical axes are parallel; the three-dimen...

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Abstract

The invention discloses a device and a method for acquiring iris images. The device comprises an imaging module, an illuminating module, a three-dimensional movement platform, a control module, an optical platform, fixing rods and a jaw support, wherein the jaw support is fixed onto the optical platform via the fixing rods, and the imaging module is fixed onto the three-dimensional movement platform; the illuminating module comprises light source fixing plates, a light intensity regulator and near-infrared LEDs, the near-infrared LEDs are arranged on the light source fixing plates annularly, and infrared rays emitted by the near-infrared LEDs are parallel to a primary optical axis of a CCD (charge coupled device) camera; and the three-dimensional movement platform comprises a lead screw and slider mechanism, a stepper motor and a driver. The device and the method have the advantages that a portion corresponding to an eye of a person can be photographed in the middle of an image by adjusting the device according to the location of the eye of the person, the left eye and the right eye of the person can be photographed by controlling the three-dimensional movement platform as needed when the three-dimensional movement platform moves, quick centering and focusing can be realized by an automatic centering and focusing algorithm, and the clear iris images can be photographed.

Description

technical field [0001] The invention discloses a non-feedback and contactless automatic iris image acquisition device, more specifically an iris image acquisition device and method. Background technique [0002] As an important identification feature, the iris has the advantages of non-contact, uniqueness, stability, and non-invasiveness. The identification system based on iris mainly consists of four parts: iris image acquisition, image preprocessing, iris feature extraction, matching and recognition. The acquisition of iris image is the first step of iris recognition, which is a very important link. However, since the diameter of the iris is very small, and the collected iris image must have enough pixels, the acquisition of the iris image is also a very difficult link. Because the existing iris collection device still has problems such as high price, requirements for the examinee, and manual operation, it needs to be further developed and researched. With the advanceme...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/20
Inventor 沈建新黄健梁春
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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