Non-contact sight tracking method based on corneal reflex

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...

AI Technical Summary

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 using corneal reflection is proposed. Principle, using 5 groups of near-infrared light sources (4 groups located at 4 corners of the screen, and the other group located near the optical axis of the CCD camera) as the system light source non-intrusive line-of-sight tracking technology based on a single CCD camera

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