A New Method of Rapid Pupil Positioning

A positioning method and pupil technology, applied in the field of image processing, can solve problems such as low efficiency, achieve the effect of improving accuracy and efficiency, and improving accuracy and efficiency

Active Publication Date: 2022-02-11
JIANGSU UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will cause the localization method of iris recognition system to be less effective when encountering more heterogeneous iris images

Method used

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  • A New Method of Rapid Pupil Positioning
  • A New Method of Rapid Pupil Positioning
  • A New Method of Rapid Pupil Positioning

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] like Figure 1-6 As shown, a novel pupil quick positioning method described in the present invention comprises the following steps:

[0030] (1) For input figure 2 Using Otsu's method to binarize, we get image 3 , again image 3 Connected regions are marked, and the marking method is as follows:

[0031] a. After binarization, the foreground image is marked with 1, and the background image is marked with 0;

[0032] b. Traversing the original image, when encountering a foreground image, judge whether the foreground image p(i, j) (where p is the original image, i, j represent the corner marks of the row and column respectively) is marked, if the pixel p(i, j) is not marked, save its coordinate value to the queue, and mark the pixel at the corresponding coordinate position of the marking matrix;

[0033] c. Search the eight neighbors of p(i, j), when encou...

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Abstract

The invention discloses a novel pupil rapid positioning method, comprising the following steps: (1) marking the connected areas in the binarized iris image; (2) calculating the number of pixels in each connected area; (3) ) Use the points on the four outermost directions of each connected region to define the window of the smallest circumscribed circle for the region, and calculate the window area; (4) select the threshold value of the number of pixels to initially screen the connected region; (5) calculate The ratio of the number of pixels in the connected region to the area of ​​the smallest circumscribed circle window of the connected region, and the connected region with the largest ratio is taken as the connected region of the pupil. The invention proposes an improved iris positioning algorithm, which effectively improves the accuracy and efficiency of iris recognition under non-ideal conditions. The advantage of searching for the largest connected region is that the interference points are automatically removed according to the gray feature of the pupil, which avoids the errors caused by the extraction of invalid edge points and the mistaken entry of illegal points when fitting the inner boundary of the iris.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a novel pupil rapid positioning method. Background technique [0002] With the rapid development of society and technology, information security has become more important than ever. Traditional identification methods such as identification items and identification knowledge are gradually being replaced by biometric technology due to their inherent defects and loopholes. Several classic biometric identification technologies currently used for identity verification mainly include: face recognition, voice recognition, fingerprint recognition, palmprint recognition, iris recognition, etc. Among them, the iris recognition technology stands out among many identification technologies due to its excellent biological characteristics such as stable characteristics, high anti-counterfeiting, and not easy to steal, as well as the non-contact characteristics of collection and detection method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06V40/19G06T7/11G06T7/13G06T7/136G06T7/194G06T7/62
CPCG06T7/11G06T7/13G06T7/136G06T7/194G06T7/62G06V40/19
Inventor 武栋张佳金丹萍顾灏
Owner JIANGSU UNIV OF TECH
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