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Living body iris patterns collecting method and collector

A technology of iris image and acquisition method, which is applied in the direction of instruments, character and pattern recognition, computer parts, etc., can solve the problems of not clear enough images, the influence of recognition rate, and the efficiency of iris recognition, so as to achieve high definition and characteristic texture obvious effect

Inactive Publication Date: 2005-02-23
TSINGHUA UNIV
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Problems solved by technology

The obvious disadvantage of this method is that its focusing method is not user-friendly, requiring the user to constantly adjust their position in order to obtain a clear iris image. If it is an inexperienced user, it may take a long time to focus to obtain a clear image. Image, image 3 It is the iris image obtained by this method, and it can be clearly seen that the iris 31 of the image collected by this method is not clear enough
[0007] It can be seen that the fixed-focus acquisition method with fixed eyes is not a non-invasive acquisition method for users, and it is not suitable for use in public places, which limits the promotion of iris recognition technology
The artificial focusing method brings inconvenience to the user, which will directly affect the efficiency of iris recognition. The images collected by this method are not clear enough, which will also affect the recognition rate.

Method used

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  • Living body iris patterns collecting method and collector
  • Living body iris patterns collecting method and collector
  • Living body iris patterns collecting method and collector

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Embodiment Construction

[0034] A living iris image acquisition method and device proposed by the present invention are described in detail as follows with reference to the accompanying drawings and embodiments.

[0035] The embodiment flow process of the method of the present invention is as Figure 4 shown, including the following steps:

[0036] 1) Adjust the front and rear positions of the subject so that his eyes are within the field of view of the camera, and the camera continuously transmits the captured dynamic images;

[0037] 2) When the dynamic image changes from dark to bright, sample in the whole image, if the gray value of the image in the middle part is lower than the gray value of the surrounding image, it is confirmed to be an eye image;

[0038] 3) Count the gray value of the eye image, find the center point of the area with the lowest gray value, and set this point as the initial pupil center;

[0039]4) Set the gray-scale difference threshold and the gradient threshold of gray-sc...

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Abstract

A method for collecting living body iris image includes confirming dynamic image being eye image, counting up eye image grey scale value to find out initial pupil centre, collecting a series of eye image in different focal surface to make image quality evaluation in order to confirm the best quality iris image.

Description

technical field [0001] The invention belongs to the technical field of biometric feature identification and automatic identity identification, and in particular relates to a live iris image acquisition technology. Background technique [0002] With the increasing development of information technology, biometric identification technology is more and more integrated into people's daily life. For a country with a large population like my country, biometric identification technology has a wide range of application prospects and technical significance. Due to the obvious increase in the frequency of authority verification at all levels in the field of information technology, encryption methods such as passwords and IC cards are easy to be stolen by others, and accidental events such as loss will bring a lot of inconvenience to users. However, biometric identification has advantages that other identification systems do not have, which provides a solid technical foundation for it t...

Claims

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Application Information

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IPC IPC(8): G06K9/00
Inventor 林喜荣胡竞谭汝谋周斌瞿蓬
Owner TSINGHUA UNIV
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