Image Processing Method for Pupil Tracking

An image processing and pupil technology, applied in the field of ophthalmology medical image processing, to improve the image processing time and eliminate the effects of trailing images

Active Publication Date: 2021-01-01
WENZHOU MEDICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But for children, retinoscopy has its application limitations

Method used

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  • Image Processing Method for Pupil Tracking
  • Image Processing Method for Pupil Tracking
  • Image Processing Method for Pupil Tracking

Examples

Experimental program
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Embodiment Construction

[0035] Embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0036] Such as figure 1 As shown, the present invention is a method for image processing of eccentric photography optometry based on machine vision, which includes the following steps: using a camera to continuously collect eye images, and image processing is performed on each image respectively. If the pupil can be successfully located in 6 consecutive images, The tracking measurement can be completed. It includes the following processes:

[0037] Initialize the system first, clear the counter, that is, set i=0. Collect an image with a camera and save it in a file format with a low compression rate, such as bmp or jpeg format, to ensure that the image has more local details;

[0038] In the next step, the image collected by the camera is processed. In the process of single-frame image processing, there are two common situations that will cause inaccura...

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Abstract

The invention discloses a pupil tracking image processing method, which comprises the following steps: 1) collecting eye images multiple times; 2) processing the eye images collected each time, and determining whether the collected images can locate the pupil; 3) continuously The pupil can be located in n eye images, and the pupil tracking is determined to be completed. The present invention greatly improves the image processing time by looking for potential bright spot areas and analyzing the blob shape, and can eliminate trailing images caused by pupil movement, and then use When finding the pupil edge, the drawing line method is used with the svm support vector machine to accurately locate the pupil edge, and finally the weighted least square method is used to fit the circle / ellipse (pupil), thus realizing the real-time tracking and analysis of the pupil in a complex background, It provides reliable basic data for subsequent calculation of eye refractive parameters.

Description

technical field [0001] The invention relates to an ophthalmology medical image processing method, in particular to a pupil tracking image processing method. Background technique [0002] Retinoscopy is the gold standard for refractive error detection, with an accuracy of up to 0.25D. But for children, retinoscopy has its application limitations. The hand-held vision screening instrument is an instrument specially designed and produced for infant vision screening in recent years. Its characteristics are: it can be tested while keeping a certain distance from the subject, and it does not require the subject to have a high degree of cooperation. This makes it not only suitable for people with strong cooperation ability like the previous inspection method, but also suitable for vision screening of infants and people with poor cooperation ability. [0003] It uses an infrared light source to project onto the retina, and the light reflected back through the retina presents diff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00A61B3/103
CPCA61B3/103G06V40/193G06T7/246G06T2207/10016G06T2207/30041A61B3/0008A61B3/0025A61B3/112G06T7/0012G06T7/60
Inventor 黄锦海于航沈梅晓陈浩
Owner WENZHOU MEDICAL UNIV
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