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Quick optic disc positioning method based on multi-scale macula detection

A multi-scale speckle and positioning method technology, applied in image data processing, instrumentation, computing, etc.

Inactive Publication Date: 2015-07-22
XIANGTAN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] In order to solve the above-mentioned technical problems existing in the existing optic disc positioning methods, the present invention provides a fast optic disc positioning method based on multi-scale speckle detection that is simple, high in accuracy, suitable for different sizes of optic discs and fast in positioning speed

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  • Quick optic disc positioning method based on multi-scale macula detection
  • Quick optic disc positioning method based on multi-scale macula detection
  • Quick optic disc positioning method based on multi-scale macula detection

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Embodiment Construction

[0043] The present invention will be described in further detail below through specific embodiments in conjunction with the accompanying drawings.

[0044] Such as figure 1 Shown, the optic disc positioning method of the present invention, its specific process is:

[0045] (1) Fundus image mask processing.

[0046] Such as figure 2As shown in (a), the retinal fundus image usually contains a dark background and the retinal fundus imaging area, and the ROI (Region of Interest) needs to be extracted first in the preprocessing link. The ROI area is approximately circular in the retinal fundus image, and the gray value is much stronger than the surrounding dark background. In order to exclude the surrounding dark background area, the ROI area of ​​the fundus image can be segmented by selecting an appropriate threshold. For the original color fundus image after conversion to a grayscale image, take 10% of the maximum grayscale value of the image as the threshold t b , and segme...

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Abstract

The invention discloses a quick optic disc positioning method based on multi-scale macula detection. The quick optic disc positioning method includes the steps of 1, masking fundus images; 2, performing boundary filling to the fundus images; 3, determining candidate regions of optic discs; 4, excluding boundary candidate positions; and 5, determining positions of the real optic discs. As the optic discs are represented by bright-yellow circular regions of different sizes, multiple candidate regions of optic discs are determined according to the multi-scale space theory and the LOG macula detection technology, and then the real optic discs are positioned on the basis of appearance characteristics of the candidate regions and local vasculature characteristics. By the quick optic disc positioning method, optic disc positioning is performed on the fundus images after the fundus image are reduced, and the real-time detection effect is achieved; due to the multi-scale detection capacity, the method is adaptable to different size of image data sets, and has the advantages easiness, high accuracy, quick positioning and the like.

Description

technical field [0001] The invention relates to a method for automatically locating an optic disc in a retinal fundus image, in particular to a fast optic disc positioning method based on multi-scale speckle detection. Background technique [0002] The optic disc is one of the main physiological structures of the retina. In a normal retinal fundus image, the main physiological structures that can be observed include the optic disc, blood vessels and macula. The optic disc, blood vessels, and macula have a certain spatial distribution constraint relationship. The appearance of the optic disc is a bright yellow approximate circular area. At the same time, the optic disc is also the converging area of ​​the retinal blood vessels. The blood vessels extend from the optic disc to the entire retina. The positioning method of the optic disc is based on the fundus image Therefore, the automatic positioning of the optic disc based on computer vision has always been the focus of resear...

Claims

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Application Information

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IPC IPC(8): G06T7/00
CPCG06T7/0012G06T2207/30041G06T2207/30101
Inventor 张东波王颖
Owner XIANGTAN UNIV
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