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Portable iris image acquiring device

The technology of an iris image and acquisition device, which is applied in the field of iris image acquisition device, can solve the problems of short acquisition distance, complex structure, expensive price, etc., and achieve the effects of reduced energy consumption, uniform iris illumination, and simple structure

Inactive Publication Date: 2006-03-29
INST OF AUTOMATION CHINESE ACAD OF SCI
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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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  • Portable iris image acquiring device

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Embodiment

[0043] The invention can be used in an iris-based identification system. combine Figure 5 The description and use process is as follows: the user is located at a certain distance from the acquisition device, and knows whether his position is in the middle 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 within the effective imaging range, , the distance sensing module 8 starts lighting by the selection control switch 32 of the lighting circuit 3: infrared light-emitting diode (LED) 2 emits light, which is reflected to the optical lens 4 and the image sensor 5 through the iris. The sensor 5 collects the image and sends it to the computer for analysis through the USB connection line 7, and the computer will prompt the user to move in a specific direction according to the analysis result, so that the user's iris is in a clear imaging range. When the collected image is clear and available, th...

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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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IPC IPC(8): G06K9/20A61B5/1171
Inventor 王阳生何玉青屈俊
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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