Iris image segmentation 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, good robustness, and improved operating efficiency.

Active Publication Date: 2020-08-28
BEIJING EYECOOL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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

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  • Iris image segmentation method and device
  • Iris image segmentation 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 flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and, Although a logical sequence is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than here.

[0030] figure 1 Is a flowchart of an iris image segmentation method according to an embodiment of the present invention, such as figure 1 As shown, the method includes the following steps:

[0031] Step S102: Obtain the position parameters of the pupil by coarsely positioning the pupil in the iris image.

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

[0033] Step S104, expan...

Embodiment 2

[0176] This application also provides an iris image segmentation device, which is used to implement the iris image segmentation method in Embodiment 1. Picture 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 coarse positioning module 90 is used for coarse positioning of the pupil in the iris image and obtaining pupil position parameters.

[0178] The iris outer circle parameter estimation module 92 is used to expand the annular iris outer boundary candidate area image into a rectangular image in the polar coordinate system according to the position parameter of the pupil, and obtain the result according to the gray change of the rectangular image The estimated value of the outer circle boundary of the target iris.

[0179] The eyelid boundary detection module 94 is configured to intercept the upper eyelid area and the lower eyelid area of ​​the target iris acc...

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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] The biological characteristics currently used for identification mainly include fingerprints, voices, gait, palm prints, human faces, and iris. These inherent biological characteristics of the human body have the characteristics of universality, uniqueness, and stability. At the same time, they will not be lost Or forget. Now biometric identification technology has been widely used in many fields such as access control system, airport security check, criminal investigation identification and so on. Among many biological characteristics, the iris has a great development advantage due to its high safety 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 ensure the performance of the iris ...

Claims

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Application Information

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Patent Type & Authority Patents(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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