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Colorful contact lens false-proof detection method

A contact lens, anti-counterfeiting detection technology, applied in the field of image processing, can solve problems such as failure

Inactive Publication Date: 2007-10-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Its disadvantage is that when the attacker deliberately does not focus, the method of using FFT to detect false irises will fail

Method used

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  • Colorful contact lens false-proof detection method
  • Colorful contact lens false-proof detection method
  • Colorful contact lens false-proof detection method

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Embodiment Construction

[0032] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and processes are provided, but the protection scope of the present invention is not limited to the following implementations example.

[0033] In order to verify the effectiveness of the present invention, the iris image used in the embodiment adopts the iris library taken by oneself, and wherein the colored contact lenses are common colored contact lenses sold on the market. The whole implementation process is as follows:

[0034] (1) Quickly locate the outer circle of the iris by using the geometric method: first, determine the area where the outer circle is located, and then use the geometric method to quickly locate the outer circle of the iris. Specifically, it is achieved through the following three steps: ...

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Abstract

An anti-false check method of colorful contact lens comprises that 1, using geometry method to position the outer circle of iris, 2, based on the parameter of the outer circle, finding the constant area of a false iris, normalizing while the sample angle is 180-360degrees, 3, based on the normalized iris image in the step 2, extracting the contrast of a gray symbiotic matrix of the normalized iris image and the angle second-order moment, calculating the gray average value and variance of the normalized iris image, to obtain a four-dimension character vector, 4, based on the character vector, using a vector machine to classify two types, as one type is real iris and another type is false iris. The invention can quickly and effectively check colorful contact lens, to reduce the iris recognize error rate.

Description

technical field [0001] The invention relates to a method in the technical field of image processing, in particular to an anti-counterfeit detection method for colored contact lenses. Background technique [0002] One of the advantages of the identification method based on biometric features is its high reliability, but various biometric features are also in danger of being forged, and iris recognition, which has the lowest false recognition rate, is no exception and is also facing the danger of being attacked. With the application of iris recognition technology more and more widely, the potential attacks on the existing iris recognition system will also be more and more. At present, the most important pseudo-iris is printing iris, including: printing illegally obtained living iris images On paper and printed on colored contact lenses. Therefore, the existing anti-counterfeiting methods both at home and abroad are mainly aimed at printing pseudo irises, but seldom have anti-...

Claims

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Application Information

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IPC IPC(8): G06K9/00
Inventor 施鹏飞何孝富
Owner SHANGHAI JIAO TONG UNIV
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