Eye fundus image enhancement method and system

A fundus image and image technology, applied in the field of image processing, can solve problems such as the inability to preserve thin blood vessels in the fundus

Active Publication Date: 2017-03-15
SHENZHEN UNIV
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Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a fundus image enhancement method and system, which aims to solve

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  • Eye fundus image enhancement method and system
  • Eye fundus image enhancement method and system
  • Eye fundus image enhancement method and system

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Embodiment Construction

[0126] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0127] Such as figure 1 As shown, the fundus image enhancement method provided by the present invention comprises the following steps:

[0128] Step A: constructing a blood vessel dictionary using fundus learning images, and the blood vessel dictionary includes a set number of first sub-image blocks.

[0129] Step A specifically includes:

[0130] Step A1: Divide the fundus learning image into several first sub-image blocks of the same size, and the number of the first sub-image blocks should be greater than the set number. According to the manual segmentation results of the fundus learning image, the fundus learning image can be divided into several first sub-image blocks of 8*8 size, and these first sub-image blocks should contain fundus image ...

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Abstract

The invention relates to an eye fundus image enhancement method and system. The method comprises the steps: constructing a blood vessel dictionary through an eye fundus learning image; carrying out the Frangi filtering of a to-be-enhanced eye fundus image, dividing blood vessels in a second subimage block into thick blood vessels and fine and fragile blood vessels through direction filtering, and setting the residual error weight and residual error threshold value of a blood vessel region according to the above; solving the inner products of the second subimage block with all first subimage blocks in the dictionary, selecting the first subimage block with the biggest inner product, and calculating the corresponding sparse coefficient of the first subimage block; calculating a residual error image through the selected first subimage block and the second subimage block, calculating the residual error of the blood vessel region in the second subimage block through the residual error weight of the blood vessel region, setting the residual error image as the second subimage block if the residual error is greater than the residual error threshold value, and repeatedly carrying out the process of selecting the first subimage block and calculating the residual error; reconstructing the second subimage blocks through the sparse coefficient, recombining the reconstructed second subimage blocks, and obtaining an enhanced eye fundus image. The method effectively inhibit the background noise, and keeps the fine and fragile blood vessels.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a fundus image enhancement method and system. Background technique [0002] Eye imaging is an important means of medical auxiliary diagnosis and treatment. Many eye diseases can be directly or indirectly judged by analyzing the images of blood vessels in the eye. In the eye image, there are various eye blood vessels of different thicknesses. By enhancing these blood vessels, a clearer and more accurate eye blood vessel image can be obtained, which is helpful for assisting clinical diagnosis. [0003] There are many methods of fundus image enhancement, and the commonly used methods are: [0004] domain smoothing method. That is, the gray value of a certain pixel and its neighboring pixels in the image is used as the gray value of the pixel. The advantage of this method is that it is simple, but the disadvantage is that it will blur the image of blood vessels in the eye...

Claims

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Application Information

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IPC IPC(8): G06T5/00G06T7/00
CPCG06T5/005G06T7/0012G06T2207/20021G06T2207/20182G06T2207/30041G06T2207/30101
Inventor 杨烜张正瑞裴继红
Owner SHENZHEN UNIV
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