A Optic Disc Localization Method Combining GBVS Model and Phase Consistency

Abstract

The invention discloses an optic disk positioning method combining Gbvs model and phase consistency. The implementation process is: (1) extracting the green channel of the color fundus image; (2) obtaining the mask image of the fundus image to obtain the Region of Interest (ROI) of the fundus image; (3) extracting brightness, Three types of features: brightness contrast and phase consistency; (4) Construct a saliency map with an improved graph-based visual saliency model (Gbvs); (5) Extract the skeleton line of veins and blood vessels from the fundus image, and use the least squares method Parabola fitting; (6) comparing the significance in the neighborhood of the apex of the parabola with the average significance of the entire fundus image to determine the position of the optic disc. In the process of calculating the saliency map, according to the characteristics of the optic disc in the fundus image, three types of features, brightness, brightness contrast, and phase consistency are extracted, and the saliency model based on the map is improved, and the structural characteristics of the veins are used when locating the optic disc. Aids in precise positioning. The experiment proves that the method in this paper works well.

Description

technical field [0001] The invention belongs to the technical field of image processing, and relates to an optical disk positioning method combined with a Gbvs model and phase consistency. It can be used to locate the optic disc on fundus images with different degrees of normal and lesion. Accurate optic disc positioning can assist in locating the position of important tissue structures in the retinal fundus, and plays an important role in fundus image analysis. Background technique [0002] The processing and analysis of retinal fundus images can help doctors to screen and diagnose eye diseases and systemic diseases such as diabetes, and track the development of diseases. In the color retinal fundus image, the optic disc is a sub-circular, nearly yellow or white bright spot, accounting for about one-seventh of the fundus image in diameter. In addition, since the optic disc is the origin of the optic nerve and the origin of fundus blood vessels, there are a large number of...

AI Technical Summary

Problems solved by technology

Analyzing the existing optic disc localization methods in fundus images, the optic disc localization method using the appearance characteristics of the optic disc is suitable for normal fundus images, but when there are fundus lesions with similar brightness to the optic disc, it is easily disturbed by lesions and has poor robustness ; and for the optic disc positioning method based on blood vessel segmentation, because the blood vessel segmentation itself is a complicated task, the optic disc positioning based on this method often takes a long time and cannot meet the real-time requirements of fundus optic disc detection

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