A fast measurement method for the longitudinal distance of human eye sight

Abstract

The invention relates to a method for measuring longitudinal distances of sight of human eyes. The method includes particular steps of 1, creating an eccentric photographic measuring device comprising a camera, an infrared light source, an infrared filter lens, a telescope, a human face support, an infrared cut-off filter and the like; 2, detecting pupil boundaries, acquiring pupil regions by means of processing by the aid of run algorithms and acquiring boundaries by means of equation fitting; 3, computing the internal brightness distribution of pupils, and computing ratios of certain longitudinal lengths of the pupil regions to the lengths of integral longitudinal axes; 4, measuring longitudinal distances, acquiring the longitudinal distances of the sight by the aid of pre-measurement calibration parameters and current brightness distribution conditions of the pupils by means of computing. Average values of gray values of the integral pupil regions are used as threshold values, and the certain longitudinal lengths of the pupil regions are larger than the threshold values. The method has the advantages that information of the longitudinal distances can be obtained during sight tracking, accordingly, the sight can be truly three-dimensionally tracked, and the method further can be used for improving the precision of the traditional two-dimensional sight tracking systems; the method is low in computational complexity, and quick measuring and real-time tracking effects can be realized.

Description

technical field [0001] The invention relates to the technical field of measuring the visual distance of the human eye, in particular to a method for quickly measuring the longitudinal distance of the human visual line. Background technique [0002] At present, the measurement of the visual distance of human eyes is mainly based on the binocular parallax method, and the accuracy of such measurement is very poor. When people's eyes are focused on the same point, because there is a distance (about 3-5cm) between the eyes, the line-of-sight vectors of the two eyes do not completely coincide. Therefore, the binocular parallax method is to measure the sight direction vector of each eye separately, and the intersection of the two vectors is the focus of human eye observation. However, the measurement error of the human eye's line of sight direction vector is relatively large, and the secondary error caused by using it to calculate the focus position of the human eye will be very l...

AI Technical Summary

Problems solved by technology

However, the measurement error of the human eye's line of sight direction vector is relatively large, and the secondary error caused by using it to calculate the focus position of the human eye will be very large. Moreover, some studies have shown that the position of the intersection point of the line of sight direction vector is not necessarily the position of the human eye. The focus of observation, the focus of human eye observation will appear within a certain distance before and after the intersection of the line of sight direction vector

This will cause the traditional binocular parallax measurement accuracy to be relatively low.

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