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Iris location method

An iris positioning and iris image technology, which is applied in the direction of instrument, character and pattern recognition, acquisition/recognition of eyes, etc. Effect

Inactive Publication Date: 2012-06-27
BEIJING TECHSHINO TECH
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Problems solved by technology

[0010] In addition, during the image acquisition process, the size of the pupil will change with the change of the lighting environment, the eyelids and eyelashes block the iris area, the distance between the human eye and the acquisition device is also uncertain, and there is a certain angle between them relationship, so even for different images of the same human eye, there are differences in the positioning results

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Embodiment Construction

[0038] In order to describe the content of the present invention conveniently, some terms are defined first.

[0039] Definition 1: Iris. The center of the eyeball is the black pupil, and the ring-shaped tissue between the outer edges of the pupils is the iris, which presents interlaced texture features similar to spots, filaments, stripes, and crypts. The iris of the same person hardly changes throughout a person's life, and the iris of different people is completely different.

[0040] Definition 2: Binarization threshold. The grayscale threshold value used when binarizing the image.

[0041] Definition 3: 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 binarization threshold, the value of the point is binarized to 1 (or 255); when the value on the image is less than the binarization threshold, the value of the ...

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Abstract

The invention relates to an iris location method. The method comprises the following steps of: step 1, detecting spots in an iris image; step 2, judging whether the iris image shakes; step 3, initially locating a pupil; step 4, locating the iris. The method has the following benefits that: the iris is located by a two-dimensional round Gabor filter and a weighted calculus detection operator, interference on an iris identification system caused by noise information is reduced, internal and external boundaries can be quickly and accurately located in the iris image, and the stability and the accuracy of an iris location algorithm are improved.

Description

technical field [0001] The invention relates to an iris positioning method, in particular to an iris positioning method based on a two-dimensional circular Gabor filter and a weighted calculus detection operator. Background technique [0002] With the development of information technology, mankind has entered an unprecedented information age. Information security has also become a hot issue that people pay more and more attention to. In daily life, we often need to verify the identity of ourselves or others. Reliable identification can save us from troubles in life and protect the security of personal information. Reliable identification technology also makes financial and commercial transactions safer and more effective. Due to the fact that traditional identity authentication is very easy to be forged and lost, it is becoming more and more difficult to meet the needs of society. With the development of biological sciences, biometric identification has attracted more and m...

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Application Information

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IPC IPC(8): G06K9/00G06K9/54
CPCG06K9/00G06K9/00604G06V40/19
Inventor 张祥德王琪单成坤周军
Owner BEIJING TECHSHINO TECH
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