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Portable iris image acquiring device

An iris image and acquisition device technology, applied in the field of iris image acquisition devices, can solve the problems of short acquisition distance, complex structure, and high price, and achieve the effects of simple structure, uniform iris illumination, and reduced energy consumption

Inactive Publication Date: 2007-12-05
INST OF AUTOMATION CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These characteristics of the iris make it impossible for ordinary cameras to capture clear images of the iris that can be used for identification
Due to the use of zoom system, the existing iris collection devices are mostly large in size, complex in structure and expensive; there are also some small devices with fixed-focus lenses, but these devices may be contact type, and the collection distance is relatively short, so they are not widely used. Convenient, or for non-contact long-distance devices, it is difficult for users to find a suitable positioning point so that users can accurately locate the appropriate imaging place to collect clear and effective iris images
Therefore, there are certain restrictions on the application

Method used

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Embodiment

[0043] The invention can be used in an iris-based identification system. The use process is described in conjunction with FIG. 5 as follows: the user is located at a certain distance from the acquisition device, and knows whether his position is centered through the image in the cold mirror 1 of the acquisition device. At this time, the distance sensing module 8 judges whether the user is located within the effective imaging range , as appropriate, the distance sensing module 8 starts the lighting through the selection control switch 32 of the lighting circuit 3: the infrared light-emitting diode (LED) 2 emits light, and the light is reflected to the optical lens 4 and the image sensor 5 through the iris. At this time, the imaging processing circuit 9 of the acquisition device The image has been collected from the image sensor 5 and sent to the computer for analysis via the USB cable 7, and the computer will prompt the user to move in a specific direction according to the analy...

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Abstract

The present invention relates to a portable iris image acquisition device. It includes cold mirror, infrared light-emitting diode, lighting circuit, imaging lens, image sensor, imaging processing circuit, external shell and USB connecting wire. Said invention also provides their connection mode, and can be connected with computer by means of USB interface.

Description

technical field [0001] The invention relates to an iris image acquisition device, in particular to a long-distance non-contact and portable iris image acquisition device. Background technique [0002] As an important identification feature, the iris has the advantages of non-contact, uniqueness, stability (characteristics are fixed), and non-invasiveness. At the same time, according to statistics, the error rate of iris recognition is the lowest among various biometrics. . The identification system based on iris mainly consists of four parts: iris image acquisition, image preprocessing, iris feature extraction, matching and recognition. [0003] The acquisition of iris image is the first step in iris recognition, and it is also a relatively difficult step. The iris is a small organ with a diameter of about ten millimeters, and the color of the iris varies greatly among different races. The iris of Caucasians is rich in color, while the iris of yellow races is mostly dark b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/117G06K9/20A61B5/1171
Inventor 王阳生何玉青屈俊
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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