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Automatic-tracking and automatic-zooming method for acquiring iris images

An iris image and automatic zoom technology, applied in the field of iris recognition, can solve problems such as inconvenience, misalignment of the lens, and users' reluctance to actively cooperate with equipment, so as to improve efficiency and expand the application range

Inactive Publication Date: 2009-09-02
INST OF AUTOMATION CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many problems with these devices: First, in some cases, users are unwilling to actively cooperate with the device, or it is inconvenient for the user to approach the instrument
Second, even if the user is willing to take the initiative to cooperate, whether it is to use the voice prompt or to align the mirror by the person himself, the person must cooperate with the movement of the instrument, which causes great inconvenience; some people even spend a long time on it. The camera is not accurate or the distance is not well grasped

Method used

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  • Automatic-tracking and automatic-zooming method for acquiring iris images
  • Automatic-tracking and automatic-zooming method for acquiring iris images
  • Automatic-tracking and automatic-zooming method for acquiring iris images

Examples

Experimental program
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Effect test

Embodiment 1

[0111] Embodiment 1: the iris recognition system applied to automation and intelligence

[0112] The invention can be used in automatic and intelligent iris recognition system. The process of use is as follows: At the entrance of a clubhouse, visitors need to perform iris recognition to verify their identity. However, since the guests are more distinguished, it is not convenient for the machine to direct the guests to move up, down, left, and right to complete the identification. Therefore, an automated iris image is used at the entrance of the clubhouse. Identify the device. When a guest enters the clubhouse and stays in front of the intelligent iris recognition system for 3 seconds, the device will automatically rotate the narrow-angle camera, capture the iris image, identify the guest, and issue the voice of "Mr. So-and-so, welcome." The guests feel that the security measures of the hotel are very good, and it is convenient to use and highly intelligent, and they are very ...

Embodiment 2

[0113] Embodiment 2: The iris recognition system applied to large-scale users

example

[0114] The invention can improve the practicability of the iris recognition system, especially for large-scale users and special groups. Examples are as follows:

[0115] A certain customs clearance port needs to use the iris recognition system to verify the identity, and the passers-by need to queue up for verification. Among them are three people: Zhang San, who is 190 tall, Li Si, who is 150 tall, and Wang Wu, who have never used the device. All three had registered images of their irises, and they came to the gate for identification. The iris recognition instrument used by Guankou was 150 meters high. Zhang San had to squat down and raise his face to recognize it, while Li Si had to lift his toes to see the lens. Wang Wu was not familiar with the instrument, so although he aligned his eyes, Can't grasp the distance from the camera. As a result, the three of them couldn't keep their eyes on the camera for a long time, and later they completed the identification with the h...

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Abstract

The invention relates to an automatic-tracking and automatic-zooming method for acquiring iris images. The method includes the following steps: a camera with wide angle of view, a camera with narrow angle of view (long focus) and an infrared light source are closely installed on a controllable tripod head which drives the two cameras and the infrared light source to rotate simultaneously; a system adopts the camera with wide angle of view to continuously detect facial images of human; when the facial image is available, eye images of human are detected to obtain the exact locations of human eyes; and then the tripod head is controlled to rotate up and down or left and right, which allows that the camera with narrow angle of view and the infrared light source aim at the human eyes; user distance and picture quality are determined simultaneously to control the camera to automatically zoom; when clear iris images are acquired, image processing and iris recognition are carried out and the user identity is determined. A system device comprises a computer, the controllable tripod head, the camera with wide angle of view, the camera with narrow angle of view, the infrared light source, a power supply, an image grabbing card and other auxiliary equipments.

Description

technical field [0001] The invention relates to an iris image acquisition method using automatic tracking and automatic focusing, which is an iris recognition method applied in the field of biological feature recognition by integrating technologies such as computer vision, image processing, pattern recognition and automatic control. Background technique [0002] Among the current biometric identification technologies, iris recognition technology is one of the most accurate and anti-counterfeiting technologies, and has broad market application prospects. The steps of iris recognition generally include steps such as iris image acquisition, liveness detection, preprocessing, feature extraction and feature matching. Among them, iris image acquisition 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. [0003] The earliest iris ima...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/20G06K9/46G06K9/62H04N5/232G06V10/147
CPCG06V40/161G06V40/19G06V10/147
Inventor 谭铁牛孙哲南董文博谭剑波何召锋
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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