Non-contact sight tracking method based on corneal reflex

A non-contact, eye-tracking technology, applied in the field of computer vision, can solve problems such as too many pose restrictions, inaccurate pupil extraction, and inaccurate positioning of human gaze coordinates

Inactive Publication Date: 2014-01-22
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

[0003] Aiming at the deficiencies of the existing eye-tracking technology based on CCD (Charge Coupled Device, charge-coupled device) cameras, the pupil extraction is inaccurate, the gaze coordinates of the human eye are inaccurately positioned, and there are too many restrictions on posture, a new method usi

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  • Non-contact sight tracking method based on corneal reflex
  • Non-contact sight tracking method based on corneal reflex
  • Non-contact sight tracking method based on corneal reflex

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Embodiment Construction

[0055] The present invention will be further described below in conjunction with the accompanying drawings.

[0056] The invention designs a non-intrusive line-of-sight tracking technology based on a single CCD camera, which utilizes the principle of corneal reflection and uses five near-infrared light sources as system light sources. Use the grayscale of the image for the initial positioning of the human eye, which is fast and accurate. A direct least-squares ellipse fitting is proposed for cyclic fitting, noise removal, until the center of the ellipse is fixed, and finally the precise center of the pupil is obtained. Using the cross-ratio invariant principle for coordinate mapping, the gaze coordinates can be accurately calculated. The system does not require external equipment, and has good adaptability to the natural rotation of the human head.

[0057] Aiming at the deficiencies of the existing visual tracking technology, such as complex equipment, too many restrictions...

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Abstract

The invention provides a non-contact sight tracking method based on corneal reflex. The method comprises steps as follows: step one, positioning of human eyes; steps two, calculation of light spot coordinates; step three, accurate positioning of pupils; and step four, space mapping: mapping of space coordinates is performed according to the calculated coordinates of four light spots on a screen, the coordinates of the pupil centers and the invariant principle of a cross ratio in the projective geometry. According to the provided technical scheme, a user doesn't need to wear other devices, so that limitation to the user is reduced greatly; a new pupil edge fitting scheme is proposed and used for circularly fitting and rejecting ideal points, so that the accurate pupil center is obtained, and the mapping accuracy is improved; and compared with the conventional correlational research, the accuracy is improved greatly.

Description

technical field [0001] The invention relates to the field of computer vision, and mainly relates to pupil detection and recognition, ellipse fitting, detection and extraction of multiple light spots, and three-dimensional spatial geometric mapping and the like. Background technique [0002] Most of people's information is obtained through eyes, and because the information obtained through vision is of great significance to people's life, the research on vision is very important. With the rapid development of science and technology, visual tracking has increasingly become the focus of research by experts and scholars at home and abroad. Due to the late start and the limitations of technical support, research on visual tracking is still in its infancy, and there is still no ideal solution that can be widely used in daily life. Contents of the invention [0003] Aiming at the deficiencies of the existing eye-tracking technology based on CCD (Charge Coupled Device, charge-cou...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/54
Inventor 王轩韩锴于成龙张加佳赵海楠张自力李鑫鑫李晔漆舒汉张江涛关键刘博
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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