A system calibration method for a three-dimensional line-of-sight tracking system

Abstract

The invention discloses a system calibration method for a three-dimensional line of sight tracking system. The method changes the position of the calibration sphere, photographs multiple groups of calibration spheres and bright spot images at different positions, and constructs multiple These planes intersect the line connecting the light source and the optical center of the system camera, thereby obtaining the straight line where the light source is located, setting multiple possible light source points on the straight line where the light source is located, and bringing them into the 3D line-of-sight tracking system for optimization Solve the problem, converge the possible light source points to the real light source point, obtain the three-dimensional space coordinates of the real light source, and calibrate the screen in the same way. The method of the invention fully considers the influence of various error factors, can solve the problem that the light source and the screen are not within the field of view of the system camera, and is especially suitable for the near-eye line of sight tracking system. It has the advantages of high calibration accuracy and convenient operation, and can better meet Calibration requirements for 3D gaze tracking system.

Description

Technical field [0001] The present invention relates to the field of computer visual technology, and in particular, to a system calibration method for a three-dimensional view line tracking system. Background technique [0002] Sight tracking techniques can be roughly divided into two categories: gaze estimation methods based on two-dimensional mapping and gaze estimation based on three-dimensional models. The two-dimensional staringal estimation system is typically composed of a camera and a light source, wherein the eye is attached (gaze point, POR) is estimated by the calibrated gaze mapping function determined by the user calibration. Two-dimensional staring tracking typically utilizes a second-order polynomial to represent a direct mapping of a flicker-pupil difference vector to a gaze point (POR), with most of the polynomial coefficients for user specific, need to be determined during user calibration, users need to stare A plurality of points on the screen calculate unknow...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a system calibration method for a three-dimensional line of sight tracking system, which is mainly used to calibrate the three-dimensional coordinates of the system light source in the camera coordinate system and the plane equation of the screen in the camera coordinate system, and can solve the problem that the light source and the screen are not in the same position. Problems within the field of view of the system camera, especially suitable for the near-eye line of sight tracking module, can better meet the calibration requirements of the 3D line of sight tracking system

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