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Iris locating method based on boundary point search and SUSAN edge detection

An iris positioning and edge detection technology, applied in the field of image processing, can solve problems such as noise and inaccurate iris positioning results

Inactive Publication Date: 2008-08-20
UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST
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  • Application Information

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Problems solved by technology

Its disadvantage is that noise is often introduced in the edge point extraction, making the iris positioning results inaccurate

Method used

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  • Iris locating method based on boundary point search and SUSAN edge detection
  • Iris locating method based on boundary point search and SUSAN edge detection
  • Iris locating method based on boundary point search and SUSAN edge detection

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Embodiment Construction

[0029] Adopt the method of the present invention, at first use the iris location program of C and C++ language writing; Then adopt CMOS or CCD imaging device to take the original image of iris automatically; Then the iris original image photographed is input to the iris in the VC++ interface as source data processed in the preprocessing program. Using 4,800 gray-scale iris images of different people with different lighting conditions and different shooting postures as source data, the positioning accuracy rate is 97.33%, and it only takes 100ms to locate an image.

[0030] In order to describe the content of the present invention conveniently, some terms are defined first.

[0031] Definition 1: Iris. The center of the eyeball is the black pupil, and the ring-shaped tissue between the outer edges of the pupil is the iris. It presents interlaced texture features resembling spots, filaments, striations, and crypts. The iris of the same person hardly changes throughout a perso...

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Abstract

The invention relates to a iris location method based on border point search and SUSAN edge detection, wherein the method using projection method first, to do and horizontal gray projection for binary iris image filled by spot, obtain rough center of pupil; through vertical scanning gray curve, to find a point which gray value is greater than a threshold value as internal border point of iris; circle fitting a series of the internal border points, thus obtaining location information of inner edge of the iris; Through SUSAN edge detection method, to cause the situation of obvious external border of the iris characteristic solved well, through direction detection, obtaining radius of external border of the iris, and location information of external border of the iris accurately; locating external border of the iris through the SUSAN edge detection method outside edge of the iris position is a feature of the invention, comparing with general two-step iris location method, positioning accuracy rate of the invention is enhanced by 5 percentage, and the speed of the same is enhanced by 40 percent.

Description

【Technical field】 [0001] The invention belongs to the technical field of image processing, and mainly relates to iris identification technology in biometric identification. 【Background technique】 [0002] In today's information age, how to accurately identify a person's identity and protect information security is a key social problem that must be solved. For this reason, biometric authentication technology has quietly risen, and has become a frontier research topic in the field of information security management in the world. Biometric identification technology refers to the use of the inherent physiological or behavioral characteristics of the human body for personal identification. Iris identification technology is a branch of biometric identification technology. It is the application of computer image processing technology and pattern recognition technology in the field of personal identification. Due to its high stability and high accuracy, it has become a popular deve...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/38
Inventor 解梅鲁剑
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST
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