Method for quickly measuring longitudinal distances of sight of human eyes

A technology of longitudinal distance and measurement method, which is applied in the direction of eye testing equipment, medical science, diagnosis, etc., can solve the problems of low measurement accuracy, large error, large secondary error, etc., achieve good measurement accuracy, reduce human limitations, The effect of image processing simplification

Active Publication Date: 2015-09-23
SOUTH CHINA NORMAL UNIVERSITY
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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

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  • Method for quickly measuring longitudinal distances of sight of human eyes
  • Method for quickly measuring longitudinal distances of sight of human eyes
  • Method for quickly measuring longitudinal distances of sight of human eyes

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Embodiment Construction

[0028] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings and examples, but the implementation and protection of the present invention are not limited thereto.

[0029] The problems to be solved in this example can be mainly divided into the following points: From the captured eye image, accurately detect the boundary of the pupil. Determines the distribution of light and dark in the pupil area. According to the calibration process, empirical parameters are obtained. Actual measurement, use the formula of empirical parameters to calculate the line-of-sight distance.

[0030] 1. Coaxial adjustment of the measuring system

[0031] In conjunction with Fig. 1, the entire device is fixed on the optical bench, and the face support 1 is used to support the face of the subject; the infrared cut-off filter 2 bends the measuring light path to the right side of the face support; the telescope 3 is used to ...

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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...

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Application Information

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IPC IPC(8): A61B3/10
Inventor 韩鹏陈文创尹礼明林棉璇
Owner SOUTH CHINA NORMAL UNIVERSITY
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