Method and device for positioning iris image

An iris image and iris technology, applied in the field of biometrics, can solve the problems of inability to guarantee final convergence, poor anti-interference ability, and low positioning accuracy, and achieve the effects of being less susceptible to interference, strong anti-interference ability, and high precision

Active Publication Date: 2019-01-25
山东眼神智能科技有限公司 +2
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Problems solved by technology

However, the positioning method based on the irregular boundary adopts an iterative method and depends on the selection of the initial value. Once the initial value exceeds the boundary, the method usually fails to detect, and even if a good initial value is given, the final convergence cannot be guaranteed. Under the interference of noise, it often detects false edges
Low positioning accuracy, low generalization, and poor anti-interference ability

Method used

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  • Method and device for positioning iris image
  • Method and device for positioning iris image
  • Method and device for positioning iris image

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Embodiment Construction

[0041] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0042] In one aspect, the present invention provides a method for locating an iris image, such as figure 1 Shown, including:

[0043] Step S101: Perform coarse pupil positioning on the iris image.

[0044] In this step, a variety of methods can be used to coarsely locate the pupil, locate the position of the pupil, and then appropriately expand the pupil position to obtain the rough position of the iris. This article uses the radial symmetric transformation method.

[0045] Step S102: Initialize the coordinates of multiple key points on the basis of coarse positioning.

[0046] Determine the initial position of the key points according to the results of the coarse positioning (including the center and radius of the pupil). We can manually mark ...

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Abstract

The invention discloses a method and device for locating an iris image, comprising: performing coarse pupil positioning on the iris image; initializing the coordinates of a plurality of key points on the basis of the rough positioning; and extracting SIFT feature vectors of the key points; Using the SDM algorithm to map the SIFT feature vector of the key point into a coordinate increment; using the coordinate increment, update the coordinate value of the key point; use a robust regression method to perform curve fitting on the key point , get the parameters of upper eyelid parabola, lower eyelid parabola and iris outer circle. Compared with the prior art, the method for locating the iris image of the present invention is simple, convenient, fast, strong in anti-interference ability, high in precision, high in generalization and good in robustness.

Description

Technical field [0001] The invention relates to the field of biological recognition, in particular to a method and device for positioning an iris image. Background technique [0002] Eyelid positioning and iris positioning methods occupies an important position in the iris recognition system. The accuracy of the positioning method directly affects the iris feature coding and matching process. An efficient, accurate and stable positioning method is an important criterion to measure the pros and cons of the iris recognition system. [0003] In the iris recognition system, to extract the effective iris area in the human eye picture, the positioning of the upper and lower eyelids of the human eye and the positioning of the iris edge are indispensable. In practical applications, the storage of massive iris pictures must consider the limitation of storage space, which requires some compression of iris pictures. We do not need to store irrelevant information during compression. For iris p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00
CPCG06V40/193G06V40/19
Inventor 张晓梦许猛张伟琳唐青松王琪
Owner 山东眼神智能科技有限公司
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