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Iris positioning method based on multi-resolutions analysis

A multi-resolution analysis and iris positioning technology, applied in the field of iris identification, which can solve the problems of excessive calculation, poor versatility, and noise sensitivity.

Inactive Publication Date: 2008-09-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST
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Problems solved by technology

[0007] The above-mentioned iris map positioning algorithms all have problems to a certain extent, such as excessive calculation, sensitivity to noise, poor versatility, etc.

Method used

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  • Iris positioning method based on multi-resolutions analysis
  • Iris positioning method based on multi-resolutions analysis
  • Iris positioning method based on multi-resolutions analysis

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Embodiment Construction

[0039] In order to describe the content of the present invention conveniently, some terms are defined first.

[0040] 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 person's life, and the iris of different people is completely different.

[0041] Definition 2: Grayscale image. An image that contains only luminance information in the image without any other color information.

[0042] Definition 3: Binarization threshold. The grayscale threshold value selected when performing binarization on the image.

[0043] Definition 4: Binarization. The process of converting all values ​​of the entire image into only two values, generally these two values ​​are 0 and 1 or 0 and 255. When the value on the image is greater than or equal to the...

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Abstract

The invention provides a method of iris location based on multi-resolution analysis, comprising: locating out rough circle center (x, y) of a pupil via operations, such as binary, mathematical morphology, gray scale, searching for smallest pieces and so on; then searching for a coordinate of a maximum value of the gray scale and gradient in certain rage on a plurality of lines near (x<0>, y) as the coordinate of pupil boundary point, and locating out exact circle center and radius of the pupil via curve fitting; according to precise components of each line of gray serial near the rough circle center (x, y) in the resolution of 2<-5> and 2<-6>, searching for the coordinate of local minimum value point as an external border boundary point of the iris and processing curve fitting to gain exact circle center and radius of the external border of the iris. Adopting the method based on multi-resolution analysis which is provided by the invention can effectively process a positioning operation of iris image, and avoid a problem that traditional arithmetic is sensitive for occlusion of eyelid and eyelash.

Description

【Technical field】 [0001] The invention relates to the technical field of image processing, and mainly relates to the iris identification technology in biometric identification. 【Background technique】 [0002] Living in a highly informationized modern society, identification has penetrated into every aspect of people's daily life. At the same time, due to the rapid development of transportation, communication and network technology, the scope of human activities is increasing, and the difficulty and importance of identification are becoming more and more prominent. For a country with a large population like my country, identity authentication has particularly broad application prospects and important strategic significance. Finance, security, network, e-commerce, etc. all do not require reliable identity authentication. The traditional methods of identity authentication using passwords have disadvantages such as easy forgetting and easy counterfeiting, which no longer meet t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00
Inventor 解梅潘力立马争
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST
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