Iris image segmenting method and device

An iris image and iris technology, applied in the field of image processing, can solve the problem that the iris image cannot be segmented and segmented accurately, and achieve the effects of low segmentation accuracy, high stability and good stability.

Active Publication Date: 2018-04-03
BEIJING EYECOOL TECH CO LTD
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  • Description
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  • Application Information

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Problems solved by technology

[0008] The embodiment of the present invention provides an iris image segmentation method and device to solve the technical problem that iris image segmentation methods in the prior art cannot segment low-quality iris images or have low segmentation accuracy

Method used

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  • Iris image segmenting method and device
  • Iris image segmenting method and device
  • Iris image segmenting method and device

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Embodiment 1

[0029] According to an embodiment of the present invention, an embodiment of an iris image segmentation method is provided. It should be noted that the steps shown in the flow chart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and, Although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.

[0030] figure 1 It is a flow chart of the iris image segmentation method according to an embodiment of the present invention, as figure 1 As shown, the method includes the following steps:

[0031]Step S102, by roughly locating the pupil in the iris image, the position parameter of the pupil is acquired.

[0032] Specifically, in the above step, a radial symmetric transformation method may be used to roughly locate the pupil, wherein the above pupil position parameters include the center and radius of the ...

Embodiment 2

[0176] The present application also provides an iris image segmentation device for implementing the iris image segmentation method in Embodiment 1, Figure 9 It is a schematic structural diagram of an iris image segmentation device according to an embodiment of the present invention, and the device includes:

[0177] The pupil rough positioning module 90 is configured to perform rough positioning of the pupil in the iris image, and obtain the pupil position parameter.

[0178]The iris outer circle parameter estimation module 92 is used to expand the image of the circular iris outer boundary candidate region into a rectangular image in the polar coordinate system according to the position parameter of the pupil, and obtain An estimate of the outer boundary of the target iris.

[0179] The eyelid boundary detection module 94 is used to intercept the upper eyelid area and the lower eyelid area of ​​the target iris according to the estimated value of the outer circle boundary par...

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Abstract

The invention discloses an iris image segmenting method and device. The method includes performing rough positioning on a pupil in an iris image; expanding an image in a candidate area on the outer boundary of an annular iris into a rectangular image in a polar coordinate system and acquiring an excircle boundary estimation value of a target iris according to the gray level change of the rectangular image; intercepting an upper eyelid zone and a lower eyelid zone of the iris image according to the excircle boundary, acquiring boundary points of an upper eyelid and a lower eyelid, performing curve fitting on the boundary points of the upper eyelid and the lower eyelid, and obtaining an upper eyelid boundary curve and a lower eyelid boundary curve; performing noise detection on valid zones determined according to the upper eyelid boundary and a lower eyelid boundary; performing fine positioning on the excircle boundary of the iris through a radial projection method and performing fine positioning on the boundary of the pupil by utilizing a calculus detection operator. The invention solves a problem of low accuracy of low quality iris image segmentation performed by iris image segmenting methods in the prior art.

Description

technical field [0001] The invention relates to the field of image processing, and relates to an iris image segmentation method and device. Background technique [0002] Biometrics currently used in identification mainly include fingerprints, voice, gait, palm prints, face and iris, etc. These inherent biological characteristics of the human body have the characteristics of universality, uniqueness, stability, etc. At the same time, they will not be lost or forget. Now biometric identification technology has been widely used in access control systems, airport security checks, criminal investigation and identification, and many other fields. Among many biological characteristics, iris has great development advantages due to its high security and accuracy. [0003] In the iris recognition system, the iris image segmentation occupies a very important position, and the fast and accurate iris image segmentation method can guarantee the performance of the iris recognition system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/13G06T7/136G06T7/11
CPCG06T2207/30041
Inventor 许猛王琪张祥德
Owner BEIJING EYECOOL TECH CO LTD
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