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Dynamic iris positioning method based on pupil change

An iris positioning and pupil technology, which is applied in the directions of instruments, calculation, acquisition/recognition of eyes, etc., can solve the problems of poor robustness and inaccurate positioning, and achieve the effect of improving accuracy, improving positioning efficiency and reducing the amount of calculation.

Pending Publication Date: 2021-07-20
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of method is easy to operate, and the positioning speed is relatively fast, but it is easily interfered by noise such as light spots and image blur, and the positioning is not accurate and the robustness is poor.

Method used

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  • Dynamic iris positioning method based on pupil change
  • Dynamic iris positioning method based on pupil change
  • Dynamic iris positioning method based on pupil change

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: In this embodiment, take a specific pair of iris diagrams as an example to carry out iris positioning, and its process is as follows figure 1 shown.

[0029] Step1 obtains the original iris map, the original iris map in the present embodiment comes from the iris database CASIA Iris Subject Aging Extension disclosed by the Chinese Academy of Sciences, one of which is as figure 2 shown.

[0030] Step2 sets the threshold to carry out binarization processing on the original iris image image. The purpose of binarization processing on the original image is to highlight the pupil according to the characteristics of the lower gray value of the pupil. The threshold setting can be based on image 3 The gray histogram of the threshold is set at the first peak and valley, and the binarized image is as follows Figure 4 shown.

[0031] Step3 uses the canny algorithm to detect the pupil boundary, and obtains Figure 5 Pupil boundary map shown.

[0032] Step4 is to...

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PUM

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Abstract

The invention discloses a dynamic iris positioning method based on pupil change. The method comprises the following steps of acquiring an original iris image, setting a threshold value to binarize the image, detecting pupil boundaries by using a canny algorithm, detecting noise of the filtered image by using an eight-connection template, scaling down the image according to a proportion, positioning a pupil boundary by using Hough transformation, namely, an iris inner boundary, dynamically positioning the outer boundary of the iris in real time through the established mathematical model of the relationship between the pupil radius and the iris outer diameter, and obtaining an iris positioning map. According to the iris positioning method provided by the invention, the iris position can be quickly and accurately positioned, and an accurate iris image is provided for subsequent feature matching.

Description

technical field [0001] The invention belongs to the technical field of iris positioning, in particular to a dynamic iris positioning method based on pupil changes. Background technique [0002] Biometric technology has always been a hot spot in the field of social security. At present, iris recognition is considered to be one of the most reliable biometric technologies in recent years. It is inherent, not easy to be destroyed, and will not change for a lifetime, and the possibility of being forged and stolen is very small. For this recognition technology, there are many algorithms at present, among which the iris positioning algorithm has always been a hot topic of research. The purpose of iris positioning is to separate the iris area from the human eye image, and then remove the non-iris information such as pupils and sclera in the original image. , Iris positioning is an important part of iris recognition, and it occupies a very important position in iris recognition. It ...

Claims

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Application Information

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IPC IPC(8): G06K9/00
CPCG06V40/197G06V40/193
Inventor 刘冬冬李向荣宋金秋
Owner QINGDAO UNIV OF SCI & TECH
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