[1]WANG Jinrong,YUAN Xuehai,LIU Zengliang.An extraction method of pupil and corneal reflection centers based on image processing technology[J].CAAI Transactions on Intelligent Systems,2012,7(5):423-428.
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An extraction method of pupil and corneal reflection centers based on image processing technology

CAAI Transactions on Intelligent Systems[ISSN 1673-4785/CN 23-1538/TP] Volume: 7 Number of periods: 2012 5 Page number: 423-428 Column: 学术论文—机器学习 Public date: 2012-10-25
Title:
An extraction method of pupil and corneal reflection centers based on image processing technology
Author(s):
WANG Jinrong1;  YUAN Xuehai1;  LIU Zengliang2
1. School of Control Science and Engineering, Dalian University of Technology, Dalian 116024, China;
2. Institute of Information Operation, National Defense University of PLA, Beijing 100091, China
Keywords:
pupil center;  corneal reflection center;  image processing;  pupilcorneal tracking method;  optimum adaptive threshold;  ellipse fitting;  extraction method
CLC:
TP751.1
DOI:
-
Abstract:
In order to improve the realtime localization accuracy and antijamming capability of the pupil center, an eyetracking method was used based on the pupilcornea tracking principle and image processing. As a result, accurate measurements of the centers of the pupil and corneal reflection were obtained. First, under the infrared light, an eye image was captured by a camera. In order to reduce the processing time, the image processing area was acquired by applying an adaptive binarization threshold. Second, the center of the corneal reflection was extracted by using a high threshold value and a low threshold value. Then, the optimum adaptive threshold value was calculated to get the location and size of the pupil. Finally, the feature points of the pupil edge were obtained by applying the gradient method, and the center of the pupil was located by a fitting ellipse. The results show that this algorithm can not only guarantee the accuracy and stability of obtaining the center of the pupil and the center of corneal reflection, but also meet the demands of realtime processing. 
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